Every company on SEAI's downloadable public registers, 1,834 of them, in one searchable table. Filter by county and by the upgrade you actually need.
Compiled from SEAI's official public registers, retrieved 27 August 2026: the Registered One Stop Shop Providers list, the Registered Solar PV Companies list, and the Registered Renewable Energy Installers file covering solar thermal and shallow geothermal heat pump installers. Republic of Ireland only, 22 Northern Ireland entries removed.
SEAI's Better Energy Homes contractor register, which covers insulation, heating controls, windows and doors and air to water heat pumps, is only searchable through a form on hes.seai.ie and publishes no downloadable list. Those contractors are not in the table below. If you need one of those upgrades, use our installer directory and we will match you.
| Company | Registered for | Counties covered |
|---|---|---|
| 021 Electrician | Solar PV | Clare, Cork, Kerry, Limerick, Tipperary, Waterford |
| 1st Choice Electrical Services Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| 3D Systems Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| A & B = New Energy Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| A RATE PLUMBING AND HEATING | Solar water heating | Dublin |
| A Simpson Electrical | Solar PV | Kildare |
| A&L Electrical | Solar PV | Waterford, Westmeath |
| A-Chill Refrigeration | Heat pumps | Mayo |
| A. J. Smith Electrical Limited | Solar PV | Louth, Meath |
| A.C.E Smart Services T/A ACE Electrical | Solar PV | Mayo |
| A.M Heating Plumbing and Gas Services | Heat pumps | Dublin |
| A1 Energy Solutions Ltd | Solar PV | Dublin, Kildare, Meath, Wicklow |
| A1 Plumbing & Heating | Heat pumps | Donegal |
| A1 Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| A1 Tradesmen Limited | Heat pumps | Dublin |
| AAA Solar Specialists | Solar PV | Galway |
| AAS Electrical Ltd | Solar PV | Dublin, Kildare, Laois, Louth, Meath, Offaly and 1 more |
| AB Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Abbeywest Electrical Ltd | Solar PV | Clare |
| Abhaile Solar and Electrical Ltd | Solar PV | Clare, Donegal, Galway, Leitrim, Limerick, Mayo and 3 more |
| AC Heating T/A Heat Angels & Co Ltd | Heat pumps | Offaly |
| Ac pro | Solar PV | Kildare |
| Access All Areas Ltd t/a Southern Solar Electrical | Solar PV | Cork |
| ACE Smart Services Ltd | Solar PV | Limerick |
| ACG Heating & Plumbing | Heat pumpsSolar water heating | Kerry |
| Achill Formwork and Construction | Heat pumps | Mayo |
| ACR Plumbing & Heating Ltd | Heat pumps | Dublin |
| Actavo Group Ltd | Solar PV | Dublin |
| Activ8 Energies | One Stop Shop | Carlow, Cavan, Dublin, Kildare, Kilkenny, Laois and 8 more |
| Activ8 Solar Energies | Solar PVHeat pumpsSolar water heating | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| AD Electrical Services | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Adam Pamplin Limited | Solar PV | Carlow, Dublin, Kildare, Laois, Wicklow |
| ADE Services | Solar PV | Monaghan |
| Adrian Doorley Plumbing and Heating | Solar PV | Wexford |
| Adrian Harrington Heating & Plumbing | Heat pumps | Cork |
| Advance Heating Systems | Solar water heating | Dublin |
| AESL | Solar PV | Dublin |
| AG Electrical (NI) Ltd | Solar PV | Donegal |
| Aghateggal Services Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Agri Solar Specialists Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Agricam CCTV | Solar PV | Carlow |
| Agricam CCTV and Electrical LTD | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Limerick and 7 more |
| AH Electrical Services and More | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Aidan Murphy Electrical | Solar PV | Monaghan |
| Aidan O'Grady Electrical Ltd | Solar PV | Dublin |
| Air Energy Service | Heat pumps | Kerry |
| Airflow Air Refrigeration (Galway) | Heat pumps | Dublin |
| Airsol Renewable Solutions / Keane Electrical | Solar PVHeat pumps | Limerick |
| Airsol Renewable Solutions Ltd | Solar PV | Galway, Leitrim, Mayo, Roscommon, Sligo |
| AJK Eelectric & Solar Ltd | Solar PV | Louth |
| AK solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Alan Byrne | Solar PV | Dublin |
| Alan Dowling Electrical Contractor | Solar PV | Kildare |
| Alan Morrison Electrical | Solar PVHeat pumps | Dublin, Louth, Meath |
| Alan Pardy Electrical | Solar PV | Dublin |
| Alantricity Electrical Professionals | Solar PV | Cork |
| All Solar Energies Ireland | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| All System Heating & Plumbing Ltd | Heat pumps | Dublin |
| All Water Services & Plumbing LTD | Heat pumps | Westmeath |
| Allbrite Heatpump Specialists Ltd | Heat pumps | Mayo |
| Allhome plumbing and heating | Heat pumps | Dublin |
| Alliance Contracting and Electrical Engineering LTD | Solar PV | Limerick |
| Almech Heating & Plumbing Ltd. | Heat pumps | Donegal |
| Alpine plumbing ltd | Heat pumps | Dublin |
| Alternative Energy | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Alternative Energy Ireland | Solar PVSolar water heating | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Alternative Heating and Cooling ltd | Heat pumps | Cork |
| Alternative power Generation T/A SDES | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Amf Electrical | Solar PV | Dublin |
| AMS Plumbing and Heating Specialist Ltd. | Heat pumpsSolar water heating | Meath |
| Ancel Lamont | Solar PV | Meath |
| Andrew Carroll Electrical Services Ltd | Solar PV | Dublin |
| Andrew Lacey Mechanical Services Ltd | Heat pumps | Tipperary |
| Anthony frayne plumbing | Heat pumps | Tipperary |
| Anthony Kilcolm plumbing and heating contractor | Heat pumps | Sligo |
| Anthony Ryan | Heat pumps | Kildare |
| Anthony Scully Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| AOS Electrical | Solar PV | Dublin |
| AP Renewables LTD | Solar PVHeat pumps | Dublin, Galway |
| Apex Renewables | Heat pumps | Donegal |
| Apex Workforce Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Apollo Solar Tech Limited | Solar PVHeat pumps | Carlow, Dublin, Kerry, Kildare, Kilkenny, Laois and 5 more |
| ARC Heating Services | Heat pumpsSolar water heating | Dublin |
| Ardkeen plumbing and heating limited | Heat pumps | Tipperary |
| Ardlea Heat Pump Services | Heat pumps | Clare |
| Ardrar Ltd T/A Swyft Energy | Solar PV | Cork, Waterford |
| Arete Connect Ltd T/A O' Rourke Electrical | Solar PV | Dublin |
| Armour Renewables | Solar PV | Louth |
| Armour Renewables Ltd T/A Cue Power | Solar PV | Louth |
| Armour renewables Ltd T/A Leinster Energy | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| ARPS Construction LTD | Solar PV | Carlow |
| ARPS Security Ltd T/A ARPS Construction | Solar PV | Carlow, Kildare, Kilkenny, Waterford, Wexford, Wicklow |
| Art Of Air Ltd | Heat pumps | Cork |
| ASAV.ie | Solar PV | Kerry |
| Ascension Lifts LTD | Solar PV | Westmeath |
| Ashgrove Mechanical Services Ltd | Heat pumps | Dublin |
| Ashgrove Renewables | One Stop ShopSolar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| ASK Mechanical Services | Heat pumps | Louth |
| Aspen Eco Power | One Stop Shop | Carlow, Dublin, Kildare, Kilkenny, Laois, Longford and 6 more |
| Asset Heating & Solar | Heat pumps | Kerry |
| Athronan Heating and Plumbing Ltd | Heat pumps | Mayo |
| Atlantic Heating And Cooling | Heat pumps | Galway |
| AV Plumbing Ltd | Heat pumps | Tipperary |
| Avolt Electrical Ltd | Solar PV | Westmeath |
| B Dolan Mechanical Mechanical Services Ltd | Heat pumps | Westmeath |
| B&S Renewable Solutions | Solar PV | Mayo, Roscommon, Sligo |
| B&S Technical Engineering Services Limited | Solar PV | Limerick |
| B.K. Plumbing and Heating | Heat pumps | Monaghan |
| BA PLUMBING AND HEATING Ltd | Heat pumps | Meath |
| BAC Electrical LTD | Solar PV | Kildare |
| Ballagh Electrical Contracting LTD | Solar PV | Tipperary |
| Ballycoe Electrical Ltd | Solar PV | Clare, Cork, Kerry, Limerick, Offaly, Tipperary and 1 more |
| Ballydowd Homes Ltd | Heat pumpsSolar water heating | Laois |
| Ballyhogan Plumbing Services Ltd | Heat pumpsSolar water heating | Offaly |
| BAM Electrical Ltd | Solar PV | Limerick |
| Barnaco Plumbing | Heat pumps | Kildare |
| Barry Gilbourne Plumbing and Heating Limited | Heat pumps | Dublin |
| Barry Mc Monagle Boiler Servicing | Heat pumps | Donegal |
| Barth Murphy Electrical | Solar PV | Galway |
| Barulaganye | Heat pumps | Dublin |
| Basrac Ltd | Heat pumps | Mayo |
| Bayside Heating & Plumbing | Heat pumps | Roscommon |
| Bayview Contracts Ltd | One Stop ShopSolar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| BBS Heating & Plumbing Limited | Solar PV | Monaghan |
| BC Electrical Fire and Security Limited | Solar PV | Dublin |
| BC Heating & Plumbing | Heat pumps | Cork |
| BD 021 Electrician Limited | Solar PV | Cork |
| Bear Plumbing And Heating Services | Heat pumps | Dublin |
| Beaufield heating services ltd | Heat pumps | Kerry |
| Begley Kelleghan Electrical | Solar PV | Sligo |
| Belgrove plumbing and heating | Heat pumps | Dublin |
| Bellehan Electrical Services T/A SC Solar | Solar PV | Carlow, Dublin, Kerry, Kildare, Kilkenny, Limerick and 4 more |
| Belmore Electrical | Solar PV | Kilkenny |
| Ben McPhillips Ltd | Heat pumpsSolar water heating | Wexford |
| BEP Energyable Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Bespoke Solar PV Installations Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Best Plumbing Solution LTD | Heat pumps | Clare |
| Best West Heating & Plumbing | Heat pumps | Roscommon |
| BFD Construction | Heat pumps | Dublin |
| BHP | Heat pumps | Roscommon |
| Bightheplumber Limited | Heat pumpsSolar water heating | Tipperary |
| Billy O'Rahilly | Heat pumps | Galway |
| Blackrock Heating | Heat pumps | Kerry |
| Blackstairs Electrical Ltd | Solar PV | Carlow, Kilkenny, Waterford, Wexford, Wicklow |
| Blackwell Contracts | Heat pumps | Cavan |
| Blackwell Energy Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| BLF Solar Solutions Ltd | Solar PV | Dublin |
| Blue Sky Solar Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Blue Solar PV Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| BMB plumbingservices | Heat pumps | Wexford |
| Bord Gais Energy Limited | One Stop ShopSolar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Bord Gáis Energy | Heat pumpsSolar water heating | Dublin |
| Boxer Security Systems | Solar PV | Kildare |
| Boyne Solar Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| BPM Heat | Solar water heating | Dublin |
| Branach Developments | Heat pumps | Galway |
| Brannigan Electrical | Solar PV | Kilkenny |
| Bray Tile Heating and Plumbing | Solar water heating | Wicklow |
| breandan lynch construction services | Heat pumps | Dublin |
| Breffni Insulation | One Stop ShopHeat pumps | Cavan, Donegal, Dublin, Kildare, Laois, Leitrim and 10 more |
| Breffni Renewables Ltd | Heat pumps | Cavan |
| Brendan McGrath Electrical | Solar PV | Limerick |
| Brendan McMahon Plumbing | Solar water heating | Mayo |
| Brendan O Keeffe &Co Ltd | Heat pumps | Cork |
| Brendan Rock | Heat pumps | Galway |
| Brennan EFS | Solar PV | Laois |
| Brennan Electrical And Facilities Services Ltd | Solar PV | Carlow, Cork, Dublin, Kildare, Kilkenny, Laois and 6 more |
| Brennan Home Improvements | Solar PV | Dublin |
| Brian Leavey Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Brian Moore | Solar PV | Dublin |
| Brian O Toole Heating & Plumbing Services Ltd | Heat pumpsSolar water heating | Dublin |
| Brian O’Neill Heating and Plumbing | Heat pumps | Cork |
| Brian Rossiter Electrical | Solar PV | Kilkenny, Waterford |
| Brian scally plumbing services ltd | Heat pumps | Roscommon |
| Bright Future Solar Ltd | Solar PV | Clare, Cork, Kerry, Kildare, Kilkenny, Laois and 5 more |
| Bright Line Systems | Heat pumpsSolar water heating | Laois, Louth |
| BroMur Energy Ltd | Heat pumps | Dublin |
| Brook Renewables | Heat pumps | Cork |
| Brooks M & E | Heat pumps | Dublin |
| Broomhall Estates Ltd | Heat pumpsSolar water heating | Wicklow |
| Brusna Energy Solutions Ltd | Heat pumps | Meath |
| BTS Renewables Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Budget Solar Ltd | Solar PV | Clare, Cork, Galway, Kerry, Limerick, Tipperary |
| Burconn | Solar water heating | Cork |
| Burke Electrical and Security | Solar PV | Cork |
| Burke Electrical Services | Solar PV | Waterford |
| Byrne Gas Ltd | Heat pumps | Westmeath |
| Byrne Solar Energy Ltd | Solar PV | Clare, Galway |
| C & H plumbing and heating | Heat pumps | Offaly |
| C and C Electrical | Solar PV | Kildare, Limerick |
| C Mac Electrical | Solar PV | Cork |
| C.A.C Plumbing Ltd | Heat pumps | Dublin |
| C.Ferguson Plumbing Ltd | Heat pumps | Leitrim |
| C.s.g plumbing and heating | Heat pumps | Dublin |
| CAenergy LTD | Solar PVHeat pumps | Cork |
| Caerus Plumbing | Heat pumps | Cork |
| Caffrey Electrical Services | Solar PV | Cavan, Dublin, Kildare, Louth, Meath |
| Caillin Wrynn | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Caimin Dooley Heating & Plumbing | Heat pumps | Cavan |
| Caldor Energy Solutions Ltd | Solar PV | Kerry |
| Caldor Solar Limited | Solar PV | Carlow, Cavan, Clare, Dublin, Galway, Kildare and 13 more |
| Calmur Heating and plumbing | Heat pumps | Galway |
| Camba | Heat pumps | Dublin |
| Cammogue Engineering Limited | Solar water heating | Cork |
| Carbery Heating Services | Solar water heating | Clare |
| Carbon Care Ltd | Solar PV | Kildare |
| Carbon Electrical Limited | Solar PV | Roscommon |
| Carbon Electrical Limited TA SolarSure | Solar PV | Carlow, Kildare, Kilkenny, Waterford, Wexford |
| Carl Rotheram Electrical | Heat pumps | Tipperary |
| Carnamoyle Renewables Ltd | Heat pumps | Donegal |
| Carr plumbing and heating | Heat pumps | Donegal |
| Carraher Solar Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Carroll Electrical | Solar PV | Clare, Galway, Mayo |
| Cassells Electrical Contractors | Solar PV | Cavan, Dublin, Galway, Laois, Leitrim, Longford and 6 more |
| Castle Property Services | Heat pumps | Meath |
| Castlegale Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Castleknock Gas | Heat pumps | Dublin |
| Castlgale Electrical Ltd | Solar PV | Dublin |
| Cathal Cawley Plumbing and Heating | Heat pumps | Limerick |
| Cathal Fitzgerald Electrical & PV Contractor | Solar PV | Carlow, Kildare, Kilkenny, Laois, Offaly, Tipperary and 3 more |
| Cathal Fitzgerald Electrical Contractor | Solar PV | Westmeath |
| Cathal Hughes Heating & Plumbing | Heat pumps | Galway |
| Cathal Lawlor Elect Serv Ltd | Solar PV | Carlow |
| Cathal Moynan | Heat pumps | Kildare |
| CB Electrical | Solar PV | Wexford |
| CB Plumbing and Heating | Heat pumps | Dublin |
| CBM Munster Construction T/A Home Energy Retrofits | One Stop Shop | Carlow, Cork, Kildare, Kilkenny, Laois, Limerick and 4 more |
| CBS Heating and Plumbing | Heat pumps | Dublin |
| CC renewable energy | Solar PV | Donegal |
| CC Renewables LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| CC Solar & Electrical | Solar PV | Wexford |
| CEK Mechanical Ltd | Solar water heating | Kildare |
| Celsius Heating and Plumbing Ltd | Heat pumps | Dublin |
| Cem plumbing and heating | Heat pumps | Dublin |
| Cew-Con | Solar PV | Dublin |
| CFPH LTD | Heat pumpsSolar water heating | Kildare, Leitrim |
| CH Services Ltd | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Charles Gallagher Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| CHC Plumbing and Heating | Heat pumps | Sligo |
| CHC Plumbing Heating | Solar water heating | Donegal |
| Chief Electric Ltd | Solar PV | Kerry |
| CHP Mechanical Services Ltd | Renewable energy installers (biomass) | Donegal |
| Chris Walsh | Heat pumps | Mayo |
| Christopher Whelan | Solar water heating | Wexford |
| Christy Delaney Plumbing and Heating | Solar water heating | Louth |
| Churchfield Home Services Ltd | One Stop ShopSolar PV | Carlow, Dublin, Galway, Kildare, Kilkenny, Laois and 13 more |
| Ciaran Crinnigan Electrical Services Ltd | Solar PV | Kildare |
| Ciprian Vlad | Heat pumps | Donegal |
| Circet | Solar PV | Dublin |
| Circet Install Limited (KN Install Limited) | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| CJP Electrical Ltd T/A Smiths of Wicklow | Solar PV | Dublin, Kildare, Waterford, Wexford, Wicklow |
| CK Energy Management solutions T/A Encon | Heat pumps | Roscommon |
| Claddagh Electrics Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Clancon Build Limited | Heat pumps | Dublin |
| Clash Plumbing & Heating LTD | Heat pumpsSolar water heating | Galway |
| Clavin Plumbing and Heating LTD | Heat pumpsSolar water heating | Roscommon |
| Clean Energy Ireland Ltd | Solar PVHeat pumpsSolar water heating | Clare, Cork |
| Clean Energy Solar LTD | Solar PV | Clare, Cork, Kerry, Limerick, Tipperary, Waterford |
| Clean Watt Limited | Heat pumps | Kilkenny |
| Clear Sky Energy Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Clendennen Electrical Services Ltd | Solar PV | Galway |
| Climate Control Renewables Limited | Heat pumps | Dublin |
| Climatech ltd | Heat pumps | Cork |
| Clonagh Ind LTD | Solar PV | Kildare |
| Cloudbreak Ltd / EV CHARGERS GALWAY / WESTERN RENEWABLES | Solar PV | Dublin |
| Clover Energy Systems LTD | Solar PV | Dublin |
| Cloverhill Renewables Ltd | Heat pumps | Meath |
| CMC Electrical Contracting Ltd / Duffy Solar | Solar PV | Mayo |
| CMC Electrical Contracting LTD T/A Solar 24 | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| CMC PLUMBING & Heating | Heat pumps | Wexford |
| CMCS Security ltd | Solar PV | Kildare |
| CMD Electrical Ireland Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| CMG Electrical Ltd | Solar PV | Donegal |
| CML Construction LTD T/A CML Renewable's | Heat pumps | Galway |
| Coakley Electrical Services | Solar PV | Galway |
| COFAB Electrical Ltd | Solar PV | Kilkenny, Tipperary, Waterford, Wexford |
| COK Electrical & Renewables Ltd | Solar PVSolar water heating | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Coleman Wright Technical Services Limited | Solar PV | Meath |
| Colin Lynskey Plumbing & Heating | Solar PV | Galway |
| Colin Westbury Electrical Services | Solar PV | Cork |
| Coller Electrical Services | Solar PV | Dublin |
| Collery Solar | Solar PV | Sligo |
| Collerysolar | Solar PV | Westmeath |
| Colm Arthur Ltd TA A1Solar | Solar PV | Sligo |
| Colm Connolly | Heat pumps | Cavan |
| Colm Vaughan | Solar PV | Cork |
| Colum Gallagher Electrical | Solar PV | Meath |
| Colum Gallagher Electrical & Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Comet Renewable Energy | Solar PV | Galway |
| Comfort Solutions Ireland | Solar PV | Mayo |
| Comfort Solutions Retrofit | Heat pumpsSolar water heating | Mayo |
| COMPLETEHEAT M&E LTD | Heat pumps | Tipperary |
| Connaught Solar | Solar water heating | Dublin |
| Connect Electrical | Solar PV | Dublin |
| Connect Mechanical & Plumbing Services Ltd | Heat pumps | Dublin |
| Connellan McGuane Heating & Plumbing Ltd | Heat pumps | Clare |
| Connex Electrical Services | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Conor Byrne Electrical | Solar PV | Tipperary |
| Conor Fee | Heat pumps | Laois |
| Conor Hickey Electrical | Solar PV | Cork |
| Conor O'Keeffe & Sons Ltd | Solar PVSolar water heating | Cork |
| Construction Power and Communications ltd | Solar PV | Waterford |
| Construction, Power, Communications LTD | Solar PV | Carlow, Dublin, Galway, Kildare, Kilkenny, Laois and 4 more |
| Coolagh Agri Import Export Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Coolagh Agri imports/exports ltd | Solar PV | Waterford |
| Cooper Insulation Ltd | One Stop Shop | Cavan, Dublin, Kildare, Longford, Louth, Meath and 3 more |
| Copper Coast Renewables | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Cor Mac Plumbing and Heating ltd | Heat pumps | Donegal |
| Corbett Electrical | Solar PV | Kilkenny, Limerick, Offaly, Tipperary, Waterford |
| Cork Solar and Electrical LTD | Solar PV | Cork, Kerry, Limerick, Tipperary, Waterford |
| Corravilla Electrical Ltd t/a CV Electrical | Solar PV | Cavan |
| Corrib Mechanical Services Ltd | Heat pumpsSolar water heating | Dublin |
| Corridon Heating & Plumbing LTD | Heat pumps | Galway |
| Courcon Ltd | Solar PV | Dublin |
| Cowan Energy Limited | Solar PV | Monaghan, Tipperary |
| Cowan Heating & Plumbing Limited | Heat pumpsSolar water heating | Cavan |
| CP Electrical | Solar PV | Dublin, Limerick, Louth, Meath |
| CPB Electrical Ltd | Renewable energy installers (biomass) | Dublin |
| CR Solar | Solar PV | Carlow, Cavan, Donegal, Galway, Kildare, Kilkenny and 13 more |
| Craft Heating and Plumbing | Heat pumps | Dublin |
| Craig Finlay plumbing and heating | Heat pumps | Kildare |
| Cranley Heating & Plumbing | Heat pumpsSolar water heating | Kerry |
| Craughwell Heating Limited t/a Natural Green Energy | Heat pumps | Galway |
| Cremin Solar Energy | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Cremur Heating Centre Limited | Heat pumps | Galway, Kerry |
| Cristian Gherghel | Heat pumps | Dublin |
| Cronin Electrical | Solar PV | Cork |
| Cross Border Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Crossflow | Heat pumps | Wexford |
| Crystal Air Renewable Energy | Heat pumps | Kildare |
| CSR Electrical Ltd | Solar PV | Galway, Mayo, Roscommon, Sligo |
| CT Electrical | Solar PV | Kildare |
| Cu-Tech Ltd | Heat pumps | Monaghan, Tipperary |
| Cubic M3 | Solar PVHeat pumps | Dublin |
| CubicM3 | Solar PV | Dublin |
| Cue Power Limited | Solar PV | Dublin |
| Cuisniu Furlong Teoranta / Furlong Refrigeration | Heat pumps | Kerry |
| CulArd Heating & Energy Ltd | Heat pumps | Wexford |
| Cullinane Refrigeration & Engineering Ltd t/a C.R.E | Heat pumps | Offaly |
| Culmore Heating and Plumbing Ltd | Heat pumps | Limerick |
| Cummins Electrical and Renewables | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Cummins Electrical And Renewables/ Wayne Cummins | Solar PV | Kildare |
| Curragh Construction Ltd | Solar PV | Galway |
| Curraghboy Electrical Services Limited t/a Egan Services | Solar PV | Cork |
| Curraghboy Electrical Services Ltd | Solar PV | Cork, Waterford |
| Current Electrical | Solar PV | Roscommon |
| CV Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| CVS Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| D Burke Electrical | Solar PV | Galway |
| D O'Toole Electrical | Solar PV | Galway |
| D.O.C. Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| D.p.h plumbing ltd | Heat pumps | Tipperary |
| DAC Solar Systems T/A Stephen Kennedy Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Daigon Ltd | Heat pumps | Donegal |
| Daly Electrical Installations Limited | Solar PV | Cavan |
| Daly Plumbing and Gas | Heat pumps | Dublin |
| DALY RENEWABLES T/A B4B RENEWABLES | Heat pumps | Dublin |
| Damian grehan plumbing and heating | Heat pumps | Roscommon |
| Damien Barron | Heat pumps | Donegal |
| Damien Kelly Electrical | Solar PV | Galway |
| Damien Mc Glinchey Elecyrical | Solar PV | Donegal |
| Damien O Brien Heating and Plumbing | Heat pumps | Dublin |
| Damoc Heating and Plumbing | Heat pumps | Wexford |
| Dan O Sullivan Heating and Plumbing LTD | Heat pumpsSolar water heating | Kerry, Westmeath |
| Daniel Ilovan | Heat pumps | Louth |
| Danny Leonardy | Solar PV | Dublin |
| Danny O Connor Plumbing and Heating | Heat pumps | Cork |
| Darial Ltd T/A EJ Fidgeon | Heat pumps | Westmeath |
| Darragh Twomey Electrical LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Darren Henson | Heat pumps | Sligo |
| Darren O Donnell Heating & Plumbing | Heat pumps | Kerry |
| Dave Gaffney Heating and Plumbing Ltd | Heat pumps | Kerry |
| Dave Monaghan Heat Pump Services | Heat pumpsSolar water heating | Dublin |
| David Connellan Electrical / Roslem Solar Energies | Solar PV | Meath |
| David Gibbons Electrical Ltd | Solar PV | Galway, Leitrim, Mayo, Roscommon, Sligo |
| David Guggisberg | Solar PV | Galway |
| David Hardiman Electrical | Solar PV | Galway |
| David Hayden | Solar PV | Carlow |
| David Hayden Electrical | Solar PV | Carlow, Clare, Cork, Dublin, Galway, Kerry and 17 more |
| David McDowell Plumbing & Heating LTD | Heat pumps | Louth |
| David McKeown | Solar PV | Louth |
| David Murtagh Electrical | Solar PV | Louth |
| David O'Mahoney | Solar PV | Monaghan |
| David O'Mahoney Electrical Services Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Davis Plumbing & Heating Contractors Ltd. | Heat pumps | Clare |
| DB Plumbing & Heating | Heat pumps | Cavan |
| Dbd plumbgas ltd | Heat pumps | Dublin |
| DBM Control systems | Solar PV | Cork |
| DC Contracts | Solar PV | Kildare |
| DC Energy Solutions | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| DC Plumbing & Mechanical Limited | Heat pumps | Clare |
| DC Plumbing ltd | Heat pumps | Tipperary |
| DC Renewables | Heat pumpsSolar water heating | Cavan |
| DC Solar | Solar PV | Clare, Galway, Kerry, Limerick, Tipperary |
| DCM Electrical Ltd | Solar PV | Dublin |
| DDV Plumbing and Heating Ltd | Heat pumps | Dublin |
| DE electrical | Solar PV | Roscommon |
| DE Electrical and Solar Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Declan Byrne T/A Bright Electrical Service | Solar PV | Meath |
| Declan Cotter Plumbing LTD | Heat pumps | Kerry |
| Declan Gallagher Heating & Plumbing | Heat pumps | Limerick |
| Declan O'Connell Heating and Plumbing | Heat pumpsSolar water heating | Cork |
| Deery Electrical Services | Solar PV | Monaghan |
| Delaney Plumbing Ltd | Heat pumps | Kildare |
| Denis Mc Enery P&H ltd | Heat pumps | Limerick |
| Denis O' Neill Electrical Services Ltd | Solar PV | Cork |
| Dennehy Bros Heating & Plumbing Ltd | Heat pumpsSolar water heating | Galway |
| Derek Cullinane Ltd T/A Cullinane Group | Solar PV | Galway |
| Dermot flannery heating and plumbing | Heat pumps | Meath |
| Dermot McGrath | Solar PV | Offaly |
| Dermot McGrath Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Derry Brosnan Electrical and Construction Services Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Des Corr & Co. Ltd. | Heat pumps | Dublin |
| Des Daly Heating & Plumbing Co.ltd | Solar water heating | Dublin |
| Des O Leary Electrical Ltd | Solar PV | Galway |
| Devaney Electrical Ltd | Solar PV | Mayo |
| DGM Plumbing and Heating Ltd | Heat pumps | Louth |
| DGS Electrical | Solar PV | Galway, Mayo |
| DH Renewable solutions | Heat pumps | Meath |
| Dial an Electrician Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Diarmuid Murphy Electrical Ltd | Solar PV | Cork |
| Diarmuid Walsh Plumbing and Heating | Heat pumps | Galway |
| Dillon Flattery Ltd | Solar water heating | Louth |
| Dingle Heating And Plumbing | Solar PV | Galway |
| Diver Electrical Limited | Solar PV | Donegal |
| Divers Educational Supplies T/A Celtic Renewables | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Dixon Heating and Plumbing | Heat pumps | Dublin |
| DJ Electrical Limited | Solar PV | Galway |
| DJN heating and plumbing, office 310, Work IQ Innovation centre | Heat pumps | Dublin |
| DM Electrical | Solar PV | Wexford |
| DMC mechanical construction ltd | Heat pumps | Mayo |
| DMG Electrical Contractors Ltd | Solar PV | Meath, Sligo, Westmeath |
| DML Electrical Contractors Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| DML plumbing and Heating LTD | Heat pumps | Leitrim |
| DMP ELECTRICAL SERVICES | Solar PV | Dublin |
| DMT Renewables Ltd | Heat pumps | Donegal |
| DNA Renewables | Solar PV | Dublin |
| DND Electrical T/A Doran & Durnin Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| DNL Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Docon Developments Ltd | Heat pumps | Dublin |
| Domestic & Commercial Energy | Solar PV | Galway |
| Donal Dwyer Heating & Plumbing | Heat pumpsSolar water heating | Cork |
| DONAL MCLOUGHLIN PLUMBING & HEATING | Heat pumps | Donegal |
| Donnacha Lambert Heating and Plumbing | Heat pumps | Kildare |
| Donnchadh Dunne Electrical Ltd | Solar PV | Offaly |
| Donoghue and O'Neill Electrical Ltd | Solar PV | Limerick, Mayo |
| Doonvalley Plumbing Ltd | Heat pumps | Cavan |
| DOR Electrical Ltd | Solar PV | Cavan, Dublin, Longford, Louth, Meath, Monaghan |
| Dore Electrical | Solar PV | Kildare |
| DORElectrical LTD | Solar PV | Cavan |
| DPAR Electrical Services LTD T/A Powerhouse Electrical Services | Solar PV | Monaghan |
| DPR Solar Services | Solar PV | Dublin |
| DPR Solar Services Limited T/A Solar Services Ireland | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| DR Solar and Electrical Services Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Dream home ltd | Heat pumps | Wexford |
| Drish Electrical | Solar PV | Kilkenny, Laois, Meath, Offaly, Tipperary |
| Drohan Electrical Contracting | Solar PV | Kildare, Limerick |
| DT plumbing and heating ltd trading as M3 plumbing and heating | Heat pumps | Cavan |
| DTN Electrical Ltd | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Meath and 5 more |
| Dublin Airconditioning Ltd t/a Dublin Air | Heat pumps | Dublin |
| Dublin City Gas Ltd | Heat pumps | Dublin |
| Duffy Heating | Heat pumps | Monaghan |
| Duignan Plumbing Ltd | Heat pumps | Meath |
| Duleek Energy Centre Ltd T/A The Energy Centre | Solar PV | Mayo |
| Duleek Energy Centre Ltd. | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Duleek Energy Centre T/A The Energy Centre | Solar water heating | Louth |
| Dun-Tec Contracting Ltd T/A GO Electrical | Solar PV | Dublin |
| Durkan Heating and Plumbing Ltd | Heat pumps | Dublin |
| Durkin Bros Ltd | Solar PV | Meath |
| DW Plumbing & Heating | Heat pumps | Offaly |
| Dwellstone Pluming & Heating | Heat pumpsSolar water heating | Dublin |
| Dylan Madden Plumbing and Heating Ltd | Heat pumps | Galway |
| Dylshan Enterprises Ltd. | Heat pumps | Galway |
| e-Solar | Solar PV | Dublin |
| Eamonn Coyne Plumbing & Heating | Heat pumps | Westmeath |
| Eamonn Power Plumbing and Heating | Heat pumps | Roscommon |
| Eamonn Tuite Ltd | Heat pumps | Meath |
| East Clare Electrical Services Ltd | Solar PV | Clare, Cork, Galway, Kerry, Laois, Limerick and 1 more |
| East Coast Energy | Solar PV | Meath |
| East Cork Heating and Plumbing Services Ltd | Heat pumpsSolar water heating | Wexford |
| Eazy Electrical | Solar PV | Limerick |
| Eccles Electrical Ireland Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Eccles Electrical Services | Solar PV | Cork |
| ECF Contracts | Solar PV | Dublin |
| Eco Energy Systems | Heat pumps | Cork |
| Eco Green Resources LTD | Solar PV | Monaghan, Tipperary |
| ECO HEATING SOLUTIONS | Heat pumps | Roscommon |
| Eco Home Improvements | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Eco Horizon Ltd | Solar PV | Carlow, Cork, Dublin, Kildare, Kilkenny, Laois and 8 more |
| Eco Revival Renewables | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Eco Solar Energy | Solar PV | Cork, Kildare, Kilkenny, Laois, Limerick, Meath and 3 more |
| Eco Technology | Solar water heating | Dublin |
| Ecoaer | Solar PV | Kildare |
| Ecocool Refrigeration Ltd | Heat pumps | Kildare |
| Ecoliving Limited t/a E L Mechanical | Heat pumps | Dublin |
| Ecologics | Solar water heating | Tipperary |
| Ecomech Renewables Ltd | Solar water heating | Mayo |
| Ecoplex Energy Solution LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Ecoplex Energy Solutions | Solar PV | Dublin |
| Ecosave Heating & Plumbing | Heat pumps | Kerry |
| Ecoscene Ltd | Heat pumps | Waterford |
| Ecosol | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Ecotech IRI Ltd | Solar PVHeat pumps | Donegal |
| Ecotherm t/a iGen | Heat pumps | Laois |
| Ecowest Electrical and Energy Services LTD | Solar PV | Galway, Limerick, Mayo, Sligo |
| Eddie Byrne Electrical Ltd | Solar PV | Longford, Offaly, Roscommon, Westmeath |
| Eddie McMahon Electrical Ltd | Solar PV | Galway |
| Eden Plumbing | Heat pumps | Tipperary |
| EDH Construction | Heat pumps | Limerick |
| Edward Lynch | Solar PV | Dublin |
| Edward Lyons Heating & Plumbing Ltd | Heat pumps | Carlow |
| Edwardyna construction LTD | Heat pumps | Dublin |
| EF Electrical | Solar PV | Kilkenny, Meath, Tipperary, Waterford |
| Efficient Renewables LTD | Solar PVHeat pumpsSolar water heating | Cavan, Cork, Donegal, Dublin, Galway, Kildare and 11 more |
| EGLX Ltd T/A EG Electrical | Solar PV | Cavan, Donegal, Dublin, Kildare, Louth, Mayo and 5 more |
| EGLXX Ltd T/A EG Electrical | Solar PV | Mayo |
| Eire Electric | Solar PV | Dublin, Louth, Mayo, Meath, Wicklow |
| Eire renewables | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Eirevolt Energy Limited | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| EirFlow Heat Service | Heat pumps | Monaghan |
| Eirinn Electrical Solutions Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Eirsolar Limited | Solar PV | Carlow, Dublin, Kildare, Louth, Meath, Wexford and 1 more |
| EITAS | Heat pumps | Dublin |
| EKR Solar Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| ELC Energy Solutions Ltd | Solar PV | Monaghan |
| Elececo Engineering | Solar PV | Clare, Dublin, Kildare, Mayo, Roscommon, Tipperary and 1 more |
| Elecko Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Elecrtrfit Limited | Solar PV | Monaghan |
| Electric Ireland Superhomes | One Stop Shop | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Electric Skyline Limited | Solar PV | Limerick, Mayo |
| Electrical Repair Services | Solar PV | Tipperary |
| ELECTRICIANZ.IE | Solar PV | Galway |
| Electronic & Mechanical Suppression Engineering Limited T/A EMSE Ltd | Solar PV | Carlow, Dublin, Kildare, Wexford, Wicklow |
| Electronic & Mechanical Suppression Engineering LTD | Solar PV | Waterford |
| Electsol Services Ltd | Solar PV | Sligo |
| Element Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Elite electrical | Solar PV | Clare |
| Elite Heatpump Repairs | Heat pumps | Galway |
| Emerald Electrical Contractors | Solar PV | Clare |
| EMF CONTROLS LTD | Solar PV | Monaghan |
| Emmet Keeshan Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 19 more |
| Encom Energy Ireland Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Encom Energy IRL Limited | Solar PV | Dublin |
| Encon | Solar PV | Carlow, Cork, Kilkenny, Tipperary, Waterford, Wexford |
| Enda Dunne Plumbing Limited | Heat pumps | Meath |
| Enda Mchugh | Heat pumps | Longford |
| Enda O'Loughlin Heating & Plumbing | Solar water heating | Galway |
| EnergieXPro | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Energise Electrical Services | Solar PV | Dublin |
| Energlaze | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Energlaze Home Energy Upgrades | One Stop Shop | Carlow, Cork, Dublin, Kildare, Kilkenny, Laois and 9 more |
| Energrid Ltd | Solar PV | Waterford |
| Energy Freedom Systems | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Energy Superstore | Heat pumps | Meath |
| Energy Upgrade | Solar PV | Dublin |
| Energyfix | One Stop Shop | Carlow, Cavan, Clare, Dublin, Galway, Kildare and 13 more |
| EnergyServ Ltd | Solar PV | Wexford |
| Energysmart Renewables Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Energywise Ireland | One Stop Shop | Clare, Cork, Kerry, Limerick, Tipperary, Waterford |
| Energywise Savings Ireland Limited | Solar PVHeat pumps | Carlow, Clare, Cork, Galway, Kerry, Kilkenny and 6 more |
| Enerpower LTD | Solar PV | Waterford |
| Engineering and Maintenance Support Services Ltd | Solar PVHeat pumps | Laois, Meath, Offaly, Westmeath |
| Enviro-Therm Ltd | Heat pumps | Meath, Sligo |
| Envirobead | One Stop Shop | Carlow, Cavan, Clare, Cork, Dublin, Galway and 14 more |
| Environmental Heating Systems Ltd | Heat pumpsSolar water heating | Kildare |
| Eoin Browne Electrical Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Eoin Hanniffy Trades365 LTD | Heat pumpsSolar water heating | Wexford |
| Eoin Shine Electrical Services Ltd | Solar PV | Monaghan |
| Epicus Electrical Services Ltd | Solar PV | Dublin |
| ePower | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Eric Conneely Pluming & Heating | Heat pumps | Galway |
| Erribul Electrical and Renewable Services Limited | Solar PV | Clare, Cork, Galway, Kerry, Limerick, Tipperary |
| eSolar Ltd | Solar PV | Dublin, Kildare, Meath, Wicklow |
| ESolutions | Solar PV | Longford |
| ESTA MAN AND SALES, Woodstock Industrial estate | Solar PV | Wexford |
| ETI Security Systems Ltd | Solar PV | Galway, Limerick, Mayo, Roscommon |
| Eugene Rooney Heating & Plumbing | Heat pumps | Galway |
| EV Charging Ireland | Solar PV | Galway, Kildare |
| Evan Fahy T/A EMF Controls | Solar PV | Monaghan |
| Evans Electrical Ltd | Solar PV | Mayo |
| Everest Mechanical Services | Heat pumps | Wexford |
| Evergreen Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Evergreen Electrical LtdGary Kerins | Solar PV | Dublin |
| Everpower LTD | Solar PV | Dublin |
| Evolution Plumbing Solutions Ltd | Heat pumpsSolar water heating | Cork |
| Evolve Eco Solutions Ltd | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Ewing electrical | Solar PV | Kildare |
| Expert plumbing | Heat pumps | Dublin |
| Expert Residential Property Limited | Heat pumps | Dublin |
| F&E Gas Services Ltd T/A D4 Plumbing & Heating | Heat pumps | Dublin |
| Fagan and Greene contractors (FGC) | Solar PV | Meath |
| Falcon Electrical | Solar PV | Cavan |
| Fanning Electrical and Solar Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Farranavarra T/A Corbett Electrical | Solar PV | Meath |
| Farrell Heating & Plumbing | Solar water heating | Dublin |
| Farrell Mechanical Services | Heat pumps | Sligo |
| FDA Heating and Plumbing Ltd | Heat pumps | Wicklow |
| Feeney Plumbing and Heating Limited | Heat pumps | Galway |
| Fenlon Heating and Plumbing | Heat pumps | Carlow |
| Fenlux Engineering T/A Infinite Energy | Solar PV | Kerry |
| Fennor Developments | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Fenton White Electrical Limited | Solar PV | Laois |
| Fergal Gleeson Plumbing And Heating | Heat pumps | Offaly |
| Fergus Mc Cann | Solar water heating | Laois |
| Ferguson Heating and Plumbing | Heat pumps | Mayo |
| Ferm ENG LTD | Solar PV | Cavan, Donegal, Galway, Leitrim, Longford, Mayo and 3 more |
| Ffs motor and trading services ltd | Heat pumps | Longford |
| Figtree Energy | Solar PV | Kildare |
| Finbarr Lynch Heating & Plumbing Ltd | Heat pumps | Cork |
| Fingal Renewables Ltd | Heat pumps | Dublin |
| Finlay Ecofit Tullamore Ltd | Heat pumps | Meath |
| Finn Heat Pumps Ltd | Heat pumps | Meath |
| FinnTech Heating | Heat pumps | Wexford |
| Finvarra LTD | Heat pumps | Galway |
| Fireco Alarms Ltd - C & R Renewables & Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| First class plumbing and heating limited | Heat pumps | Meath |
| Fitzgerald and Keane Electrical LTD. | Solar PV | Tipperary |
| Fitzgerald Electrical Electrical Services LTD | Solar PV | Clare |
| Fitzpatrick Plumbing & Heating Contractors LTD | Heat pumpsSolar water heating | Cavan |
| Fixt Ireland LTD | Heat pumps | Dublin |
| Flanagan Heating and Plumbing | Solar PV | Meath |
| Flannery and Gibbons Heating and Plumbing | Solar water heating | Longford |
| Fleming Electricial Systems | Solar PV | Wexford |
| Flood Electrical Contractors LTD | Solar PV | Westmeath |
| Florin Heating and Plumbing ltd | Heat pumps | Kerry |
| FMC Plumbing & Construction Limited | Heat pumps | Galway |
| Fokearn Energy Solutions LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Fokearn Engineering Ltd | Solar PV | Dublin |
| Foleys Plumbing Ltd | Heat pumps | Cork |
| Forsah | Heat pumps | Galway |
| Foyleview Heating and Plumbing | Heat pumps | Donegal |
| FR Electrical Limited | Solar PV | Carlow, Dublin, Kilkenny, Wexford, Wicklow |
| Frank Fennessy Ltd | Solar water heating | Monaghan |
| FreeFlo Heating & Gas Services Ltd | Heat pumpsSolar water heating | Clare |
| Frontier Electrical | Solar PV | Cavan |
| FT Energy Ltd | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Fuinneamh Renewables Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Fusion Electrical | Solar PV | Carlow, Clare, Cork, Dublin, Galway, Kerry and 12 more |
| Future Generation Energy | Solar PV | Cork |
| Future Green Energy | Solar PV | Dublin |
| Future Power Generation Ltd | Solar PV | Clare, Limerick, Tipperary |
| Future Renewables Energy Systems Limited | Solar PV | Carlow, Cavan, Donegal, Dublin, Galway, Kildare and 14 more |
| Futureproof Energy Ltd | Solar PV | Clare, Cork, Galway, Kerry, Leitrim, Limerick and 4 more |
| G and L Electrical | Solar PV | Waterford |
| G. Traynor & Sons Ltd | Heat pumpsSolar water heating | Louth |
| G.C. Electrical LTD | Solar PV | Clare, Galway, Limerick, Mayo, Roscommon |
| Gabriel Suciu | Heat pumps | Dublin |
| Gaffney Electrical Fire and Security Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Gaffney Electrical, Fire and Security Services Ltd | Solar PV | Cavan |
| Gaffney Mechanical | Heat pumps | Mayo |
| Galaxy Energy | Solar PV | Cork |
| Gallagher Heating Systems | Heat pumps | Cork |
| Gallagher Plumbing & Heating Ltd. | Heat pumps | Wexford |
| Garland Mechanical Limited T/A Garland & Hamill Mechanical | Heat pumps | Monaghan |
| Gary Warde Electrical LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Gas Electrical Services | Solar PVHeat pumps | Clare, Cork, Kerry, Limerick, Tipperary, Waterford |
| Gas Pro Heating Ltd | Heat pumps | Dublin |
| Gaswise Limited | Heat pumps | Laois |
| Gavin Walker Electrical Contractors LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Gaynor Plumbing & Heating | Heat pumps | Wexford |
| GC Leictreach Teo T/A GC Electrical | Solar PV | Dublin |
| GCSS Limited | Solar PV | Dublin, Westmeath, Wexford, Wicklow |
| GD Plumbing & Heating | Heat pumps | Donegal |
| GENR8 Electric LTD | Solar PV | Cavan, Louth, Meath, Monaghan, Waterford |
| George Cadwell | Solar PV | Dublin |
| Ger McCarthy Plumbing and Heating | Heat pumps | Kerry |
| Ger O Hanlon Electrical | Solar PV | Kerry |
| Ger Reynolds Electrical | Solar PV | Dublin |
| Gerard McNamara Electrical | Solar PV | Clare |
| Gerard Murphy Electrical | Solar PV | Cork |
| Gerard O'Donoghue | Heat pumps | Galway |
| Gerard Ryan | Heat pumps | Kildare |
| Get Switched Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| GGRENEWABLESLTD | Heat pumps | Donegal |
| Gibbs Solar Heating Cork | Solar water heating | Cork |
| Gibney Electrical Ltd | Solar PV | Cavan, Dublin, Galway, Kildare, Kilkenny, Leitrim and 9 more |
| Gilroy heating services ltd | Heat pumps | Louth |
| Gilroy's Green Energy Ltd | Heat pumps | Galway |
| Gilroys Green Energy LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| GL Plumbing & Heating | Heat pumps | Donegal |
| Gladstone Engineering Limited | Solar PV | Kilkenny, Waterford |
| Glanabbey Limited | Heat pumpsSolar water heating | Cork |
| Glas Energy | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Glebe Renewables | Heat pumps | Donegal |
| Gleeson Electric | Solar PV | Kerry |
| Glenfield Renewables Ireland LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Glenhill Plumbing Services | Heat pumps | Meath |
| Glenline | Solar PV | Galway |
| Glenmac Heating | Heat pumps | Dublin |
| Glentech Electrical Limited | Solar PV | Dublin |
| Glenview Green Energy Co Ltd | Heat pumpsSolar water heating | Cork |
| Global Rail Services Ltd | Solar PV | Dublin |
| Glynn Construction | Heat pumps | Meath |
| GM Plumbing Ltd | Heat pumps | Cork |
| GM Solar LTD | Solar PV | Galway |
| GMAC Electrical Limited | Solar PV | Kerry |
| GMC Electrical | Solar PV | Cavan, Donegal, Leitrim, Monaghan, Sligo |
| Go Solar | Solar PV | Carlow, Cavan, Donegal, Dublin, Galway, Kildare and 11 more |
| Gohery & Mullery Electrical | Solar PV | Dublin |
| GoKonnect Solar | Solar PV | Mayo |
| Golden gas and oil services ltd | Heat pumps | Dublin |
| Goodship Electrical Contractors | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Gosecure Limited T/A GoKonnect Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| GoWire Ltd | Solar PV | Wexford |
| Grangeboyne Property Development | Heat pumps | Meath |
| Grants Electrical Services LTD | Solar PV | Donegal |
| Green Air Technologies Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Green Electric | Solar PV | Meath |
| GREEN ENERGY HEATING SOLUTIONS | Heat pumps | Cavan |
| Green Energy Homes | Heat pumpsSolar water heating | Dublin |
| Green Energy Ireland | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Green Energy Plumbing and Heating | Heat pumps | Meath |
| Green Energy Renewables | Solar PV | Dublin, Kildare, Meath, Westmeath, Wicklow |
| Green Powered Systems Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Greene Mechanical Group | Heat pumps | Cork |
| Greenhouse | Solar PV | Dublin |
| Greenlight Electrical Services | Heat pumps | Dublin |
| Greenlight Solutions | Heat pumps | Cork |
| Greenside | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Greentech Renewable Heating & Plumbing Ltd | Solar water heating | Cork |
| Greentherm Ltd | Heat pumpsSolar water heating | Dublin |
| Greentricity Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Greenwatt Ltd | One Stop ShopHeat pumps | Cavan, Dublin, Meath |
| Greenwave Renewable Heating and Plumbing Ltd | Heat pumps | Laois |
| Greenway Solar & Robotics Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Greenwest Electrical Ltd | Heat pumps | Wexford |
| Grian52 Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| GRIAN52 Sustainable and Renewable Energy LTD. | Solar PV | Cork |
| GrianWest PV | Solar PV | Longford |
| Grid Solar Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Gridprosolar | Solar PV | Westmeath |
| Grigheat ltd | Heat pumps | Monaghan, Westmeath |
| GS Renewable | Heat pumps | Kildare |
| GTEC Sparks Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| GTech Mechanical Ltd | Heat pumps | Monaghan |
| H & A Mechanical Services Ltd | Solar PV | Kerry |
| Hade Ltd | Solar PV | Dublin |
| Hagim Gas Ltd | Heat pumps | Leitrim |
| Hall Power Ltd / T/A ePower | Solar PV | Cork |
| Hand plumbing and heating | Heat pumps | Dublin |
| Hanna Solar ltd | Solar PV | Carlow, Dublin, Kildare, Laois, Meath, Offaly and 1 more |
| Hanntec Engineering Ltd | Heat pumps | Waterford |
| Hanrahan Renewable Energy | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Hardiman Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Hari Krishna Kommineni | Heat pumps | Dublin |
| Harris Heating and Renewables | Solar PV | Dublin |
| Harvey Solar | Solar PV | Dublin |
| Harvey Solar Services Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Haven Electrical LTD | Solar PV | Westmeath |
| Hayes Mechanical | Heat pumps | Wexford |
| Hayesgroup | Heat pumpsSolar water heating | Clare |
| HD Renewable Energy | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| HDPV Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Heamount Electrical Ltd | Solar PV | Cork |
| Heat Doc Ltd | Heat pumpsSolar water heating | Sligo |
| Heat My Home | Heat pumps | Kilkenny |
| Heat Pump Energi | Heat pumps | Monaghan |
| Heat Pump Troubleshooters Ltd | Heat pumps | Limerick |
| Heat Service Installation & Design Limited t/a HSID | Heat pumpsSolar water heating | Galway |
| Heatage Thermal Heating | Heat pumps | Dublin |
| Heatcraft Plumbing | Heat pumps | Dublin |
| HeatGen Installations limited | Heat pumps | Monaghan |
| HeatGen Instillations Ltd | Heat pumps | Monaghan |
| Heating and Mechanical | Heat pumps | Kerry |
| Heating and plumbing | Heat pumpsSolar water heating | Clare, Tipperary |
| Heating Ltd | Heat pumps | Offaly |
| heatpumpcareinfo@gmail.com | Heat pumps | Galway |
| Heatserve Rhs Ltd. | Heat pumps | Wexford |
| Heattech heating and plumbing Ltd | Heat pumps | Kilkenny |
| Heatvision | Heat pumps | Dublin |
| Heet Pump Instillations Ltd / HeatGen | Heat pumps | Monaghan |
| Hegarty Electrical and Heating Ltd T/A Solar PV Donegal | Solar PV | Donegal |
| Hegarty Solar & Electrical | Solar PV | Limerick |
| Henco Property Services | Solar water heating | Donegal |
| Henry Deane Electrical LTD | Solar PV | Cork |
| Hercuglas | Solar PV | Monaghan |
| Hercuglas Renewables Ltd | Heat pumps | Monaghan |
| Hetto Electrical Services | Solar PV | Dublin, Kildare, Louth, Meath, Wicklow |
| Hi-Line Energy Solutions LTD | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| HICKEY ELECTRICAL ENGINEERING SERVICES LIMITED | Solar PV | Cork |
| Higcon Renewables Ireland t/a Renewables Ireland | Solar PV | Dublin |
| Hillbrook Electrical | Solar PV | Louth |
| Holcroft Electrical Services | Solar PV | Leitrim |
| Holland Services | Solar PV | Meath |
| Holte Ventures Ltd | Solar PV | Mayo |
| Home and Agri Energy LTD | Solar PV | Clare, Cork, Kerry, Kilkenny, Laois, Limerick and 4 more |
| Home Building Solutions | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Home Comfort Retrofits Ltd | One Stop ShopSolar PVHeat pumps | Carlow, Cavan, Dublin, Kerry, Kildare, Kilkenny and 6 more |
| Home Comforts Retrofits | Solar PV | Kildare |
| Home Energy Assist | Solar PV | Dublin |
| Homeology Ltd. | Heat pumps | Meath |
| Homeology Solar | Solar PV | Dublin, Kildare, Louth, Meath, Westmeath |
| Hometherm Insulation Ltd | Heat pumps | Mayo |
| Hooban Heating and Plumbing | Heat pumps | Kildare |
| Horan Electrical Limited | Solar PV | Mayo |
| Horan Plumbing LTD | Heat pumps | Kildare |
| Horizon Energy Group Ltd | Solar PV | Cork |
| Hosford Mechanical and plumbing services ltd | Heat pumps | Cork |
| House 2 Home Retrofit Ltd | One Stop Shop | Carlow, Cavan, Clare, Cork, Dublin, Galway and 19 more |
| House2home Retrofit LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| HS Plumbing and Heating | Heat pumps | Monaghan |
| HSLC t/a PV Green | Solar PV | Limerick |
| Hugh Collender | Heat pumpsSolar water heating | Dublin |
| Hugh McCann Building & Maintenance | Solar water heating | Laois |
| Hugh McLoughlin Electrical Contractor | Solar PV | Laois |
| Hugh Sweeney | Solar PV | Cork |
| Hunt Heating and Plumbing | Heat pumps | Mayo |
| Hybrid Electrical | Solar PV | Louth |
| Hybrid Engineering & Contracting Ltd | Solar PV | Westmeath |
| Hydro solutions | Heat pumps | Cork |
| HydroThermSolutions | Heat pumpsSolar water heating | Wicklow |
| Ian Gallagher Electrical | Solar PV | Donegal |
| Ian Mulvany Ltd | Solar PV | Wexford |
| Ian oliver plumbing and heating | Heat pumps | Dublin |
| ICPR | Heat pumps | Kildare |
| IDC Electrical Ltd | Solar PV | Clare |
| Ideal Electrical | Solar PV | Dublin |
| IDEAL Solar and Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| IEF Plumbing | Heat pumps | Kerry |
| Iheating and Cooling Ltd | Heat pumps | Cork |
| IKB Energy Ltd | Solar PV | Kilkenny, Limerick |
| Ikelectrics | Solar PV | Longford |
| Infinite Energy | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Limerick and 7 more |
| Infinity Plumbing & Heating Services Ltd | Heat pumpsSolar water heating | Cavan |
| Innovative Resources Ltd | Heat pumps | Waterford |
| Instant Energy Systems | Solar PV | Mayo |
| Instant plumbers Ltd | Heat pumps | Cork |
| Insulex | One Stop Shop | Clare, Cork, Kerry, Limerick, Tipperary, Waterford |
| Integrate Home Energy Upgrades | One Stop ShopSolar PVHeat pumps | Carlow, Dublin, Kildare, Kilkenny, Laois, Longford and 7 more |
| Intelligent Energy Solutions Ltd | Solar PV | Meath |
| Inthome automation | Heat pumps | Laois |
| IntHomeAutomation | Heat pumps | Laois |
| Iolair Electrical Services | Solar PV | Meath |
| Ire-Power Limited | Solar PV | Kerry |
| Irish Energies | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| IVR Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| J & D O Brien LTD | Heat pumpsSolar water heating | Dublin |
| J C Heating and Plumbing | Heat pumps | Tipperary |
| J Duggan Electrical | Solar PV | Galway |
| J O Donnell Plumbing & Heating | Heat pumps | Galway |
| J Tinney Heating & Plumbing | Heat pumpsSolar water heating | Wexford |
| J&D Plumbing and Heating | Heat pumpsSolar water heating | Donegal |
| J.Byrne & Son (Aughrim) LTD | Solar water heating | Tipperary |
| J.Treacy Electrical | Solar PV | Dublin |
| Jack O Donnell Plumbing & Heating | Heat pumps | Wexford |
| Jackie Kenny Plumbing | Heat pumps | Meath |
| James Brennan Electrical Contractor Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| James Buckley Electrical | Solar PV | Roscommon |
| James Donnelly Eco Heating Ltd | Heat pumpsSolar water heating | Limerick |
| James Heneghan Electrical Contractor | Solar PV | Longford |
| James Heneghan Electrical, Plumbing and Heating Contractor Ltd | Heat pumpsSolar water heating | Louth |
| James Kane Energy Solutions Ltd | Solar PVHeat pumpsSolar water heating | Dublin, Galway |
| James Kelly Electrical & Solar | Solar PV | Donegal |
| James Lennon | Heat pumps | Carlow |
| James Melay Electrical | Solar PV | Offaly |
| James Murphy | Heat pumpsSolar water heating | Meath |
| James Sweeney | Heat pumps | Galway |
| Jamie Harley Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Jamie Reidy Heating & Plumbing | Heat pumps | Cork |
| Jason Fahy Heating LTD | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Jason hanrahan plumbing & heating ltd | Heat pumps | Clare |
| JC Electrical | Solar PV | Mayo |
| JC Electrical and Security Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| JCD Mechanical Ltd | Heat pumps | Dublin |
| JCM Projects | Solar water heating | Dublin |
| JD Plumbing and Heating | Heat pumps | Galway |
| JE Solar Ltd | Solar PV | Donegal, Galway, Leitrim, Mayo, Sligo |
| JFK Building Services Ltd | Solar PV | Clare |
| JFK Plumbing & Heating Ltd | Heat pumpsSolar water heating | Tipperary |
| JFT Electrical Ltd | Solar PV | Kerry |
| JFW Renewables Ltd | Solar PV | Galway |
| Jim Mullin Plumbing and Heating | Heat pumps | Wexford |
| JJ Power Plumbing & Heating | Heat pumps | Waterford |
| JJS Plumbing & Heating LTD | Heat pumps | Offaly |
| JK Electrical & Solar Services | Solar PV | Dublin |
| JL Electrical services Ltd | Solar PV | Cavan |
| JM Energy Saving LTD | Solar PV | Cork, Kerry, Limerick |
| JM Energy Savings Ltd | Solar PV | Cork |
| JME Electrical & Security Systems Ltd | Solar PV | Offaly |
| JMG Solar Solutions Ltd | Solar PV | Carlow, Cork, Kilkenny, Tipperary, Waterford, Wexford |
| JOBEL Ltd | Solar PV | Tipperary |
| Joe Connolly Electrical Ltd | Solar PV | Galway, Mayo, Roscommon |
| Joe Cummins Plumbing & Heating | Heat pumps | Louth |
| Joe Sav electrical systems LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Joe Sheridan Heating and Plumbing Contractor | Heat pumps | Louth |
| Joe Thompson Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| John A. Kelly Electrical | Solar PV | Wicklow |
| John Browne Plumbing & Heating | Heat pumps | Kildare |
| John Byrne | Heat pumpsSolar water heating | Meath |
| John Corcoran | Heat pumps | Mayo |
| John Enright | Heat pumps | Donegal |
| John Fagan | Solar water heating | Roscommon |
| John G McSweeney Ltd | Heat pumps | Cork |
| John Hennessy | Solar PV | Kerry |
| John Lowry heating & plumbing Ltd | Heat pumps | Kildare |
| John Nash Plumbing Services | Solar water heating | Tipperary |
| John Neary Heating and Plumbing LTD | Heat pumps | Galway |
| John O Sullivan Electrical | Solar PV | Cork |
| John Ryan Construction Ltd | Solar water heating | Offaly |
| John Thompson M & E | Solar PV | Kilkenny |
| John Traynor | Heat pumps | Galway |
| John Warren Ltd | Solar PV | Wexford |
| Johnny Heweston Ltd | Heat pumps | Waterford |
| JOHNNY HEWETSON LTD | Heat pumps | Kilkenny |
| Johnny Kelly Electrical | Solar PV | Dublin |
| Jordan Bros | Heat pumpsSolar water heating | Limerick |
| Jordan Mc Ivor Electrical and Solar PV LTD | Solar PV | Clare, Galway, Longford, Mayo, Offaly, Roscommon and 1 more |
| Jordan McIvor Electrical | Solar PV | Meath |
| Joseph Kelly and Son Athlone Ltd | Heat pumpsSolar water heating | Sligo |
| Joseph Kenny Heating and Plumbing Ltd | Heat pumpsSolar water heating | Meath |
| Joseph Madden Heating and Plumbing LTD | Heat pumps | Meath |
| Josh Hand LTD/ Just Heat Services | Heat pumps | Dublin |
| Joyce Renewables LTD | Solar PV | Clare, Dublin, Galway, Laois, Limerick, Mayo and 4 more |
| Julius Vernys | Heat pumps | Dublin |
| Justin Colgan Ltd | Heat pumps | Meath |
| Justin Hopkins Heating & Plumbing | Heat pumpsSolar water heating | Kilkenny |
| JV Communications LTD | Solar PV | Galway, Kildare |
| JW Solar Ltd | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Waterford and 2 more |
| JWE Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| K Brown Electrical | Solar PV | Kildare |
| K Mech Mechanical Ltd | Heat pumps | Kerry |
| K&P Electrical | Solar PV | Dublin |
| K+P electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| K-Lectric | Solar PV | Cork |
| K.M.S Keating Mechanical Services | Heat pumps | Monaghan |
| Kaelen Higgins Electrical | Solar PVHeat pumps | Clare, Dublin, Galway, Limerick, Roscommon, Tipperary and 1 more |
| Kapa Management Services Ltd | Heat pumps | Dublin |
| Karl Herron Electrical | Solar PV | Cork, Kerry, Waterford |
| Karl O'Reilly | Heat pumps | Dublin |
| Karlton O Leary Electrical | Solar PV | Cork |
| Kavanagh Mechanical Services | Heat pumps | Tipperary |
| KB Electrical NI LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| KBER | Solar PV | Cork |
| KC Mechanical Services | Heat pumps | Laois |
| KD Mechanical Engineers Ltd. T/A KD Group | Heat pumps | Mayo |
| KD Smart Energy Ltd | Solar PV | Kilkenny |
| KD Smartenergy LTD | Solar PV | Kilkenny, Tipperary, Waterford, Wexford |
| Keith Brady | Solar PV | Tipperary |
| Keith Coffey Heating & Plumbing | Heat pumps | Kildare |
| Keith O Sullivan Plumbing | Heat pumps | Dublin |
| Kelan Buckley | Solar PV | Tipperary |
| Kell NFC t/a NFC Energy | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Kelltech Electro-Mechanical Services LTD | Solar PV | Kerry |
| Kelly Electrical Services Ltd | Solar PV | Cork, Donegal |
| Kelly Insulation Heating & Plumbing | Heat pumps | Wexford |
| Kelper Mechanical Ltd | Heat pumps | Dublin |
| Keltic | Solar PV | Clare, Cork, Kerry, Limerick |
| Keltic Renewables | Heat pumpsSolar water heating | Kildare |
| Ken O'Connell Electrical Ltd | Solar PV | Cork |
| Kendra Civil Engineering Ltd | Solar PV | Dublin |
| Kennedy Electrical | Solar PV | Kildare |
| Kenny Electrical Limited | Solar PV | Wexford |
| Keogan Electrical Contractors | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Keogan Electrical Services Ltd t/a Keogan Electrical Contractors | Solar PV | Dublin |
| Keogh Electrical | Solar PV | Kildare |
| Keogh Electrical and Building | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Offaly |
| Kereen Building Services Ltd | Heat pumps | Roscommon |
| Kevin blake electrical ltd t/a west clare solar | Solar PV | Clare |
| Kevin Buckley Heating & Plumbing | Heat pumpsSolar water heating | Cork |
| Kevin Durkin Heating & Plumbing Services | Heat pumps | Limerick |
| kevin English | Heat pumpsSolar water heating | Cork |
| Kevin Murphy Electrical Services | Solar PV | Laois |
| Kevin O'Kane Electrical services Ltd | Solar PV | Wexford |
| Kfm plumbing and heating | Solar PV | Dublin |
| Kieran Doherty Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Kieran Doyle Heating & Plumbing | Heat pumps | Limerick |
| Kieran Fitzpatrick Plumbing and Heating Ltd | Heat pumps | Kildare |
| Kieran Mullarkey | Solar PV | Mayo |
| Kierans Electrical & Security | Solar PV | Limerick |
| Kieron Murphy Plumbing & Heating LTD | Heat pumps | Dublin |
| Kilcock Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Kildara Heating & Plumbing | Heat pumps | Kildare |
| Killarney Eco Energy Limited | Solar PV | Cork |
| Killarney Mechanical Services Ltd | Heat pumps | Kerry |
| Killco Renewables Ltd | Heat pumpsSolar water heating | Dublin |
| Killeen Electrical Services | Solar water heating | Cavan |
| Killtech LTD | Solar PV | Galway |
| Kilmore Electrical Contractors LTD | Solar PV | Tipperary |
| Kindlon electrical Ltd | Solar PV | Leitrim |
| King Mechanical & Electrical | Heat pumps | Clare |
| Kingdom Installation Ltd | One Stop Shop | Clare, Cork, Donegal, Dublin, Galway, Kerry and 7 more |
| Kingmek ltd | Solar PV | Mayo |
| Kingspan Insulation Ltd | One Stop Shop | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Kingston Refrigeration | Solar PV | Cork |
| Kinnelite | Solar PV | Mayo |
| Kirby External Insulation Ltd. T/A Clean Energy Solar | Solar PV | Cork |
| Kirra Ltd. | Solar PV | Dublin |
| Klass Home Energy Limited TA Klass Solar | Solar PV | Dublin |
| Klass Home Energy Ltd. TA Klass Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Klass Solar | Heat pumps | Dublin |
| KLM Plumbing & Heating Ltd | Heat pumps | Dublin |
| KM Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Kme plumbing and heating | Heat pumps | Tipperary |
| KMG Electrical & EV Solutions | Solar PV | Mayo |
| KMR Energy solutions | Heat pumps | Cork |
| KMR Facilities | Solar PVHeat pumps | Cork |
| Kmv Electrical Ltd | Solar PV | Wexford |
| KND Electrical LTD | Solar PV | Kerry |
| KODE Engineering | Solar PV | Galway |
| Kode engineering and contracting services LTD | Solar PV | Kerry |
| KOL plumbing and heating ltd | Heat pumps | Wicklow |
| Kolkacool Ltd | Solar PV | Westmeath |
| Koplex Plumbing & Heating Ltd | Heat pumps | Wicklow |
| KOR Plumbing & Heating | Heat pumps | Cavan |
| Kore Retrofit Ltd | One Stop Shop | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| KPR ELECTRICAL LTD | Solar PV | Cork |
| KQM Electrical | Solar PV | Wexford |
| KRDC Electrical LTD | Solar PV | Donegal, Galway, Leitrim, Longford, Mayo, Meath and 3 more |
| KSL Plumbing & Heating | Solar water heating | Meath |
| KTB Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| KTC Electrical | Solar PVSolar water heating | Galway, Mayo, Roscommon, Sligo |
| KW Plumbing | Heat pumps | Wexford |
| Laltec Electrical LTD | Solar PV | Donegal, Leitrim, Longford, Mayo, Offaly, Roscommon and 2 more |
| Lamartine Fires & Fireplaces | Renewable energy installers (biomass) | Dublin |
| Laois Electrical | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Offaly and 1 more |
| Lara Electrical Ltd | Solar PV | Carlow, Dublin, Kildare, Laois, Meath, Offaly and 2 more |
| Larkfield Plumbing Ltd | Heat pumps | Donegal |
| Larkrock | One Stop Shop | Dublin, Kildare, Louth, Meath, Wicklow |
| Laurence mechanical services ltd | Solar PV | Cavan |
| Leading Edge Electrical LTD. | Solar PV | Wexford |
| Leahy Mechanical Contractors | Heat pumps | Limerick |
| Leahy Plumbing and Heating Solutions Ltd | Heat pumps | Limerick |
| Lean Engineering | Solar PV | Dublin |
| Ledder Engineering | Solar PV | Tipperary |
| LEDspan T/A SOLARspan | Solar PV | Kilkenny |
| Ledwith Electrical Ltd | Solar PV | Sligo |
| Lee Browne Plumbing and Heating | Heat pumps | Tipperary |
| Lee Nevin Plumbing & Heating Services LTD | Heat pumps | Donegal |
| Leetherm Insulation Ltd | Solar PV | Carlow, Clare, Cork, Kildare, Kilkenny, Laois and 5 more |
| Leetherm Project Management Ltd | One Stop Shop | Carlow, Clare, Cork, Kildare, Kilkenny, Laois and 6 more |
| Leighton Construction | Heat pumps | Cork |
| Leinster Electrical Contracts Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Leinster Electrical Contracts Limited / Leinster Electrical | Solar PV | Mayo |
| Leinster Heatpumps | Heat pumpsSolar water heating | Kildare |
| Lennon Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Liam Reddington Heating & Plumbing | Heat pumps | Mayo |
| Liam Vaughan | Heat pumps | Cork |
| Light Energy Ireland Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Lighthouse Electrical | Solar PV | Dublin |
| Limerick Gas Heating and Plumbing Ltd | Heat pumps | Limerick |
| Limerick Solar | Solar water heating | Kildare |
| Link Pro Electrical Ltd | Solar PV | Cavan, Donegal, Dublin, Galway, Leitrim, Longford and 5 more |
| Linnane Plumbing Services | Heat pumps | Clare |
| Lisavaird Co-Operative Creamery Limited | Solar PV | Cork |
| Liss Mechanical Services Ltd | Solar water heating | Clare |
| LL Solutions | Heat pumps | Clare |
| Local Power Ltd. | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Lochbeag Heating and Plumbing | Solar water heating | Cork |
| Lough Projects | One Stop Shop | Dublin, Kildare, Louth, Meath, Westmeath, Wicklow |
| Loughawn Heating LTD | Heat pumps | Longford |
| Ls Electronics | Solar PV | Donegal, Dublin, Kildare, Meath, Wexford, Wicklow |
| Lumen Engineering Limited T/A Lumen Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Lumen Solar | Solar PV | Westmeath |
| Lux Electrical Contractors Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| LVP Renewables LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Lynch Ecoenergy Engineering LTD | Heat pumps | Limerick |
| Lynch Electrical & Renewables Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Lynch Heating & Cooling | Heat pumps | Donegal |
| Lynch Plumbing Renewables ltd | Heat pumps | Cork |
| M & C Hybrid Energy Ltd | Heat pumpsSolar water heating | Cavan |
| M & R Plumbing & Heating Ltd | Heat pumps | Cavan |
| M+C Hybrid Energy LTD | Solar PV | Cavan, Longford, Meath, Monaghan, Westmeath |
| M.C. Horizon engineering ltd | Solar PV | Galway |
| M.K.O.Neill Plumbing & Heating Ltd | Heat pumps | Mayo |
| M.P. Kenny ltd | Heat pumps | Wicklow |
| M.w plumbing and heating | Heat pumps | Donegal |
| MacAire Mechanical Services Ltd | Heat pumps | Dublin |
| Madden Bros Plumbing & Heating | Heat pumps | Sligo |
| Maher Electric LTD | Solar PV | Waterford |
| Mahon MultiMedia | Solar PV | Meath, Offaly |
| Makool Refrigeration Ltd | Heat pumps | Westmeath |
| Mal Property Maintenance | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Malachy Gallagher Ballinrobe Ltd | Solar PV | Longford |
| Manning and Buckley Electrical Limited | Solar PV | Dublin, Kildare, Westmeath |
| Mark Farrell | Heat pumps | Dublin |
| Mark Rael Electrical LTD | Solar PV | Kerry |
| Mark Sheils Construction | Solar water heating | Laois |
| Marron Activ8 Energies LTD | Solar PVHeat pumpsSolar water heating | Mayo |
| Marron Heating Ltd | Heat pumps | Donegal |
| Martin Conroy Electrical and Security Systems Ltd | Solar PV | Carlow, Dublin, Tipperary, Wexford, Wicklow |
| Martin Diver Electrical LTD | Solar PV | Donegal |
| Martin Donoghue Electrical Ltd | Solar PV | Clare, Dublin, Galway, Mayo |
| Martin Electrical | Solar PV | Wexford |
| Martin Flynn Heating & Plumbing Ltd | Heat pumps | Sligo |
| Martin Murphy (Plumbing) Ltd T/A Aquatech Plumbing & Heating | Heat pumps | Dublin |
| Martin Phelan Electrical | Solar PV | Carlow |
| Marval Power Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Mastertech | Solar PV | Dublin |
| Mastertech Group Ltd. | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Matt Murphy Heating and plumbing | Heat pumps | Dublin |
| Matt Noonan Refrigeration | Heat pumps | Offaly |
| Matthew Tuohy Electrical | Solar PV | Dublin, Kildare, Wicklow |
| Max Renewable Energi Ltd | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Maxwell Electrical | Solar PV | Meath |
| Mc Caffrey Mechanical Services Ltd | Heat pumps | Donegal |
| MC Heat Pumps & Ventilation | Heat pumps | Dublin |
| Mc Quillan Electrical | Solar PV | Monaghan |
| Mcadam heating and plumbing | Heat pumps | Dublin |
| McArdle & Traynor Electrical Limited | Solar PV | Dublin, Meath |
| McCaffrey Mechanical Services Ltd | Solar PV | Donegal, Westmeath |
| McCarthy Donohoe Plumbing & Heating Services Ltd | Heat pumps | Dublin |
| McCarthy Plumbing | Solar water heating | Cork |
| McCormack brothers | Heat pumps | Westmeath |
| McCormack Plumbing & Construction Ltd | Heat pumps | Roscommon |
| MCCR Home Renewable Energy Ireland Ltd | Solar PV | Cavan, Dublin, Kildare, Longford, Louth, Meath and 3 more |
| McDonagh Doyle Custom Electric LTD | Solar PV | Carlow, Kildare, Kilkenny, Tipperary, Waterford, Wexford and 1 more |
| McDonagh Mechanical | Heat pumps | Kerry |
| McElligotts Limited T/A EZ Heat | Heat pumps | Galway |
| MCF PLUMBING & HEATING LTD | Heat pumps | Kildare |
| McGahern Plumbing & Heating | Heat pumps | Donegal |
| McGlynn Electrical | Heat pumps | Galway |
| McGrath Electrical and Mechanical Ltd | Solar PVHeat pumps | Dublin |
| MCGUINNESS MECHANICAL ENGINEERING | Heat pumps | Donegal |
| McHugh Electric | Solar PV | Dublin |
| McHugh Electric (Dublin) LTD | Solar PV | Dublin, Kildare, Meath, Wicklow |
| McLaughlin Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| McLoughlin Heating & Plumbing Ltd | Heat pumpsSolar water heating | Kerry |
| McManamon Mechanical Services Ltd | Heat pumpsSolar water heating | Kilkenny |
| McPhillips Mechanical Limited | Heat pumps | Wexford |
| MCQ Plumbing & Heating | Heat pumpsSolar water heating | Dublin |
| MDL Renewables Ltd | Heat pumps | Limerick |
| Meade & Madden Ltd t/a Glentech Electrical | Solar PV | Dublin |
| Meade & Madden T/A Glentech Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| MEC Electrical & Controls Ltd / MEC Solar | Solar PV | Laois |
| MERS (Midland Electrical Renewable Solutions) | Solar PV | Kildare |
| Metris Contractor Services Ltd | Solar PV | Clare, Cork, Limerick, Tipperary, Wexford |
| Metro Utilities Limited | Heat pumps | Offaly, Tipperary |
| MF Delta Mechanical Ltd | Heat pumps | Kildare |
| Michael Cassidy Electrical Ltd | Solar PV | Donegal |
| Michael Connor Construction | Heat pumps | Meath |
| Michael Corry Heating & Plumbing LTD | Heat pumps | Clare |
| Michael Crowley Maintenance | Solar PV | Offaly |
| Michael O'Connell Electrical Services Ltd | Solar PV | Cork, Kerry, Limerick |
| Michael Quigley Plaumbing & Heating Services | Heat pumps | Donegal |
| Mick O Shea Heating and Plumbing | Solar water heating | Galway |
| Mid West Electrical works Ltd | Heat pumps | Wexford |
| Mid West Renewable Energy Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Midfield Mechanical Services Ltd | Heat pumps | Mayo |
| Midland Heating & Plumbing Ltd | Heat pumps | Meath |
| Midland Mechanical & Electrical Services Ltd | Solar PV | Offaly |
| Midland renewables Ltd | Heat pumpsSolar water heating | Louth |
| Midtec Electrical Ltd | Solar PV | Meath |
| Midwest Eco Energy | Heat pumpsSolar water heating | Kilkenny |
| Midwest Fire & Security Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Miguel Moreau Plumbing | Heat pumpsSolar water heating | Dublin |
| Mike Curtin Electrical | Solar PV | Kerry |
| Millstream Renewable Energy Ltd | Solar PV | Kildare |
| Mitros Solar Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Mitrossolar | Solar PV | Tipperary |
| MJD Plumbing & Heating Ltd. | Heat pumps | Tipperary |
| MJQ PLUMBING SERVICES LTD | Heat pumps | Dublin |
| mkeogh h&p services ltd | Heat pumps | Westmeath |
| MMAirSolutions | Heat pumps | Carlow |
| MMCM Plumbing Services Ltd | Heat pumpsSolar water heating | Monaghan |
| MMG Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| MMK Facilities Management Ltd | Solar PV | Wexford |
| Mobility King T/A New Energy | Solar PV | Dublin |
| Monsoon Plumbing and Heating | Heat pumpsSolar water heating | Wexford |
| Moontree Ltd t/a Astro Solar | Solar PV | Tipperary |
| Moontree Solar | Solar PV | Clare, Laois, Limerick, Offaly, Tipperary |
| Moriarty Electrical Limited | Solar PV | Louth |
| Morning Star Building & Energy Limited | Heat pumps | Limerick |
| Moston Construction | One Stop Shop | Dublin, Kildare, Laois, Louth, Meath, Offaly and 1 more |
| Mountain Valley Electrical LTD | Solar PV | Waterford |
| Mountainlodge Mechanical | Heat pumps | Meath |
| Moy Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Moycullen Mechanical Services | Solar water heating | Dublin |
| Moylan Electrical Services LTD | Solar PV | Kildare |
| Moynihan plumbing services | Heat pumps | Kerry |
| Moysolar | Solar PV | Mayo |
| MPE-Online | Solar PV | Mayo |
| MPH BUILDING SERVICES | Heat pumps | Dublin |
| Mph energy solutions | Heat pumps | Kildare |
| MPH Mechanical Plumbing Heating Ltd | Heat pumps | Dublin |
| Mr Sparkx Electrical Services Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Mr Sparx | Solar PV | Waterford |
| MTK Heating and plumbing ltd | Heat pumps | Kildare |
| Mulhare Electrical Limited | Solar PV | Carlow, Galway, Kildare, Kilkenny, Laois, Offaly and 2 more |
| Mullagh Heating and Plumbing | Heat pumps | Mayo |
| Mullaney Elactricial | Solar PV | Galway |
| Mullaney Electrical | Solar PV | Galway, Roscommon |
| Mulvany Electrical / East Coast Energy | Solar PV | Louth |
| Munster External Wall Insulation T/A SE Systems | Solar PV | Cork |
| Munster Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Munstersolar | Solar PV | Tipperary |
| Murphy Plumbing and Maintenance | Heat pumps | Tipperary |
| Murphy Solar PV + Electrical Contractor Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Murray and McEvoy Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Murray Heating & Plumbing | Heat pumps | Limerick |
| MW Electrical | Solar PV | Dublin |
| My Power Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| MY REMOTE IOT IE LTD T/A 3NERGY | Solar PV | Dublin |
| Myles Donohoe | Solar PV | Tipperary |
| Myles Tobin Plumbing and Heating Services | Heat pumpsSolar water heating | Galway |
| MySolar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| N W Renewables Ltd | Heat pumps | Cork |
| N.Cunningham Mechanical Services Ltd | Heat pumps | Galway |
| N/A | Heat pumpsSolar water heating | Clare, Dublin, Kildare |
| Nairn Refrigeration & Heatpumps | Heat pumps | Meath |
| Nangle Paul Electrical Ltd | Heat pumps | Dublin |
| Nationwide Energy Solutions LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| NB Gas Plumbing + Heating | Heat pumps | Limerick |
| NC Electrical Engineering Ltd | Solar PV | Dublin |
| Neal Finnie Electrical Ltd | Solar PV | Carlow, Dublin, Kildare, Meath, Tipperary, Wexford and 1 more |
| Neat Heat Plumbing | Heat pumps | Leitrim |
| Neil McArdle Heating and Plumbing | Heat pumps | Kildare |
| Neo Mechanical Ltd | Heat pumps | Dublin |
| Netherbrook Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Nev-Mech Heating & Plumbing Ltd | Heat pumps | Kildare |
| New boilers | Heat pumps | Tipperary |
| Newbridge Heating Centre Ltd | Heat pumpsSolar water heating | Kerry |
| Newgrange Energy Ltd T/A Green Electric | Solar PV | Louth, Mayo |
| Newgrange energy T/A Green Electric | Solar PV | Mayo, Wexford |
| Newtricity Ltd | Solar PV | Mayo |
| NexSol | Solar PV | Tipperary |
| Next Gen Solar | Solar PV | Mayo |
| NextGen Electrical Ltd | Solar PV | Wexford |
| NextGen Project management solutions ltd. | Heat pumps | Limerick |
| NF Electrical Services LTD | Solar PV | Cork |
| NGS Mechanical Services ltd | Heat pumps | Dublin |
| Niall Muldoon | Heat pumps | Offaly |
| Niall Smith Energy Renewables Ltd | Heat pumpsSolar water heating | Cavan |
| Nical Engineering ltd t/a 360 Tech Engineering | Heat pumps | Roscommon |
| Nigel Dungan plumbing and heating ltd | Heat pumps | Dublin |
| Nigel M Daly Electrical | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Waterford and 2 more |
| nk plumbing and heating solutions | Heat pumps | Kilkenny |
| NKS Electrical LTD | Solar PV | Limerick |
| NMD Electrical | Solar PV | Offaly |
| NMK Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| NOC HEATING AND PLUMBING COM | Heat pumps | Kerry |
| Nodaat plumbing T/A Dna Partners | Heat pumps | Leitrim |
| Noel Cusack mechanical Ltd | Heat pumps | Cavan |
| Noel Drummond Heating & Plumbing Ltd | Heat pumps | Dublin |
| Noel Kelly Heating and plumbing ltd | Heat pumps | Kildare |
| Noel Looney Electrical and Plumbing | Solar PV | Cork |
| Noonan Refrigeration Systems Ltd | Heat pumps | Cork |
| Nordic Plumbers | Heat pumps | Meath |
| North Cork Electrical LTD | Solar PV | Cork, Kerry, Limerick |
| North West PV | Solar PV | Cork |
| North West PV IRL Ltd | Solar PV | Cavan, Donegal, Leitrim, Mayo, Sligo |
| Northeast Electrical | Solar PV | Carlow |
| Northern Refrigeration Services Ltd | Heat pumps | Cork |
| Notre Dame Plumbing and Heating | Heat pumps | Dublin |
| NRE Electrical LTD | Solar PV | Laois |
| NRE Renewables Ltd | Solar PV | Carlow, Cavan, Dublin, Kildare, Kilkenny, Laois and 8 more |
| NRG Panel | Solar PV | Mayo |
| Nualaiochtai Miotal Teoranta TA Solar Structures | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Nuarc Energy Ltd | Solar PV | Cavan, Donegal, Galway, Leitrim, Longford, Mayo and 4 more |
| NuSolas Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Nutherm Galway ltd | Heat pumps | Galway |
| Nutherm Renewables (Ireland) Limited | Heat pumps | Cork |
| NZEB Technologies Ltd. | Solar PVHeat pumps | Laois, Leitrim, Louth |
| O Connell Electrical | Solar PV | Galway |
| O Connor Heating and Plumbing | Heat pumps | Dublin |
| O Dwyer Heating | Solar water heating | Louth |
| O Hara Electrical | Solar PV | Galway, Limerick, Meath, Offaly, Roscommon, Tipperary |
| O Kelly Electrical | Solar PV | Clare, Cork, Kerry, Limerick, Tipperary |
| O Meara energy T/A Munster Solar | Solar PV | Tipperary |
| O' Heaire Mechanical Ltd | Heat pumps | Dublin |
| O'Brien Electrical Services | Solar PV | Longford, Offaly, Roscommon, Westmeath |
| O'Farrell Heating and Plumbing | Heat pumps | Westmeath |
| O'Kane Plumbing & Electrics Ltd | Solar PVHeat pumps | Donegal, Offaly |
| O'Leary Solar & Electrical Ltd | Solar PV | Cork, Tipperary, Waterford |
| O'Mahony Heating and Plumbing | Heat pumps | Cork |
| O'Neill & Sons Electrical Services | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| O'Neill Energy LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| O'Reilly Plumbing and Heating | Heat pumps | Galway |
| O'Rourke Mechanical And Electrical Services Ltd | Heat pumps | Waterford |
| O.C.M electrical services trading as Green Energy Renewables | Solar PV | Kildare |
| oakfield electrical ltd | Heat pumps | Wexford |
| OB Electrical Power Ltd | Solar PV | Meath |
| (OBEC) JPMC Ltd | Solar PV | Kilkenny |
| Obelisk | Solar PV | Cavan |
| OC electric | Solar PV | Dublin |
| OC Electrical Services | Solar PV | Sligo |
| OCCU | Heat pumps | Dublin |
| OCM ELECTRICAL SERVICE LTD/ Green Energy Renewables | Solar PV | Kildare |
| OCM Electrical Services T/A Green Energy Renewables | Solar PV | Kerry |
| OCM Energy | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| OCM Security & Electrical Services | Solar PV | Meath |
| OcTech Services Ltd | Solar PV | Cavan, Clare |
| OFE Solar & EV | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Ohk Energy Ltd | One Stop ShopSolar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| oil burner services | Heat pumps | Donegal |
| Oliver Mullen Electrical Contractor Ltd | Solar PV | Clare, Galway, Leitrim, Mayo, Roscommon, Sligo and 1 more |
| Ollie Flanagan Electrical Ltd | Solar PV | Meath |
| Ollie Keogh Electrical | Solar PV | Laois |
| Ollie Nally Heating & Plumbing | Heat pumps | Roscommon |
| OMPL | Heat pumps | Wexford |
| Onecall Electrical and Plumbing | Solar PV | Cork |
| ONENERGY RENEWABLES LIMITED | Solar PV | Carlow, Cavan, Clare, Dublin, Galway, Kildare and 13 more |
| ONG Heating and Plumbing Ltd | Heat pumpsSolar water heating | Mayo |
| Only Tools and Plumbers LTD | Heat pumps | Dublin |
| Optimize | Heat pumps | Kildare |
| Optimum Renewables ltd | Heat pumps | Donegal |
| optimum ucl | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| ORA Electrical Limited | Solar PV | Meath |
| Orenco Energy Ltd | Heat pumps | Tipperary |
| Ormonde Electrical solutions | Solar PV | Offaly |
| Owen Quirke | Solar PV | Tipperary |
| Owens plumbing limited | Heat pumps | Leitrim |
| Owers electrical ltd | Solar PV | Cork |
| O’Sullivan Electrical Automation & Control LTD | Heat pumps | Limerick |
| P C Plumbing and Heating | Heat pumps | Meath |
| P&A Fox Construction Ltd | Heat pumps | Tipperary |
| P. McMahon Electrical & Security Ltd | Solar PV | Mayo |
| P.J. McHale | Heat pumps | Longford |
| P.kilduff electrical | Solar PV | Kerry |
| P.M Electrical Works LTD | Solar PV | Cork, Kerry, Limerick, Tipperary |
| P.R OIL BOILER SERVICES | Heat pumps | Donegal |
| P.Smith Plumbing & Heating | Heat pumps | Cavan |
| Paddy Brady Heating & Plumbing Ltd | Heat pumpsSolar water heating | Louth |
| Padraig Burns Electrical Services | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Padraig O Kelly | Solar PV | Kilkenny |
| Palco Heating | Heat pumps | Kildare |
| Paragon Energy | Solar water heating | Kildare |
| PARAGON FACILITIES | Heat pumps | Dublin |
| Park Plumbing Ltd | Heat pumps | Kerry |
| Pat Caulfield Plumbing | Heat pumpsSolar water heating | Tipperary |
| Pat Colgan Electrical | Solar PV | Westmeath |
| Pat Corrigan Plumbing | Heat pumpsSolar water heating | Wexford |
| Pat dennehy electrical ltd | Solar PV | Galway |
| Pat Kelleher and Sons Ltd. | Heat pumps | Cork |
| Pat Mc Laughlin Plumbing and Heating | Heat pumps | Donegal |
| Pat the Plumber | Solar water heating | Cork |
| Pat Tobin Construction | Heat pumps | Galway |
| Patrick Francis O Connor | Solar water heating | Kerry |
| Patrick Grimes | Heat pumps | Kildare |
| Patrick Lynch Electrical Ltd. T/A Patrick Lynch Renewables | Solar PV | Dublin |
| Patrick Lynch Renewables | Solar PV | Clare, Galway, Mayo |
| Patrick Mc Carron Plumbing & Heating LTD | Heat pumps | Cork |
| Patrick Mc Mahon | Solar PV | Monaghan |
| Patrick McCabe Electrical Limited | Solar PV | Cavan |
| Patrick O Brien plumbing and heating | Heat pumps | Galway |
| Paul Bennett | Solar PV | Mayo |
| Paul Casey Electrical Ltd | Solar PV | Dublin, Meath, Wexford, Wicklow |
| Paul Collins electrical | Solar PV | Tipperary |
| Paul Feely Plumbing & Heating | Heat pumps | Sligo |
| Paul Folan Plumbing & Heating | Heat pumps | Galway |
| Paul Gallagher | Solar PV | Donegal |
| Paul Mc Laughlin Plumbing & Heating | Heat pumps | Donegal |
| Paul Murphy Heating & Plumbing | Heat pumps | Wexford |
| Paul O Mara Electrical Ltd t/a Premier Electrical | Solar PV | Dublin |
| Paul O’Sullivan Plumbing,Heating and Renewables Contractor | Heat pumpsSolar water heating | Cork |
| Paul Sherlock | Heat pumps | Tipperary |
| Paul Shortall Plumbing & Heating Ltd | Heat pumps | Laois |
| Pawel Galarowicz | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Pawels Heating and Plumbing ltd T/A PS Heating and Plumbing | Heat pumps | Kerry |
| Penrose Electrical Ltd | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Pepti Limerick Ltd, T/A Treacy Solar | Solar PV | Limerick |
| Peter Bell | Solar PV | Wicklow |
| Peter Burke Electrical Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Peter garrivan plumbing | Heat pumps | Mayo |
| Peter Nash Plumbing And Heating | Heat pumps | Tipperary |
| Peter Ormiston | Heat pumpsSolar water heating | Meath |
| Peter Waters Electrical Services | Solar PV | Tipperary |
| Peyton Electrical Ltd | Solar PV | Clare, Donegal, Galway, Leitrim, Limerick, Mayo and 2 more |
| PF Plumbing Heating and Maintenance | Heat pumps | Kildare |
| PGD Plumbing and Heating Ltd | Heat pumps | Cavan |
| PH Mechanical Ltd | Solar PV | Galway |
| PH Mechanical Ltd T/A Keltic | Heat pumpsSolar water heating | Galway |
| Phasor Maintenance | Solar PV | Dublin |
| Phelan plumbing and heating | Heat pumps | Wexford |
| Philip Redmond Electrical | Solar PV | Tipperary |
| Philly Kenny Heating and Plumbing Ltd | Heat pumpsSolar water heating | Kilkenny |
| Phoenix Electrical Services | Solar PV | Carlow, Donegal, Dublin, Kildare, Kilkenny, Wexford and 1 more |
| Phoenix Hill Limited / TriNRG | Solar PV | Mayo |
| Photonomi Energy Ireland | Solar water heating | Limerick |
| Physalia Ltd T/A Ecoaer | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Pinergy Solar | Solar PV | Wexford |
| Pinergy Solar Electric | Solar PV | Carlow, Cavan, Clare, Cork, Dublin, Galway and 14 more |
| Piotr Gorczowski Plumbing Services | Heat pumps | Dublin |
| PJ Firman & Co Ltd | Solar water heating | Tipperary |
| PJ Keogh Plumbing and Heating Ltd | Heat pumps | Cavan |
| PJE Electrical Ltd | Solar PV | Kildare |
| PJW Project Solutions | Solar PV | Cork |
| Platinum Air Conditioning Ltd | Heat pumps | Dublin |
| Plumbworx | Heat pumps | Waterford, Wicklow |
| PM Electrical Works LTD | Solar PV | Cork |
| PM Moran Electrical Ltd | Solar PV | Kildare |
| PMCC Plumbing And Heating | Heat pumps | Louth |
| PMCG Services LTD | Heat pumps | Laois |
| Polar Refrigeration and Air Conditioning ltd | Heat pumps | Donegal |
| Positive Electrical | Solar PV | Clare, Cork, Kildare, Limerick |
| Power Core Ltd | Solar PV | Clare, Cork, Kerry, Limerick, Tipperary |
| Power house electrical limited | Solar PV | Wicklow |
| Power Plumbing Ltd | Heat pumps | Clare |
| Power Plus Solar | Solar PV | Wicklow |
| Power Solar | Solar PV | Laois |
| Powered By The Sun | Solar PV | Kildare |
| Powers Solar PV Installations LTD | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Longford and 6 more |
| Powersol Electrical Limited | Solar PV | Leitrim, Mayo, Meath, Roscommon, Sligo |
| Powersolar | Solar PV | Carlow, Dublin, Kildare, Laois, Louth, Meath and 3 more |
| Powerup Electrical Limited | Solar PV | Waterford |
| Preision Plumbing Services | Heat pumps | Dublin |
| Premier Electrical Services | Solar PV | Dublin |
| Premier Energy | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| premier Heating & plumbing | Heat pumps | Tipperary |
| Premier Heating Consultants LTD | Heat pumps | Tipperary |
| Prime Fix | Heat pumps | Kildare |
| Prime Solar Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Priority Energy Solutions | Solar PV | Cork |
| Pro Solar NI | Solar PV | Donegal |
| ProEx Energy | Solar PV | Longford |
| Proex Engineering trading as ProEx Energy | Solar PV | Longford |
| Progas Ltd | Heat pumps | Kilkenny |
| Proserve Solutions Ltd | Solar PV | Tipperary, Wexford |
| Prosolar Limited | Solar PV | Clare, Cork, Galway, Kerry, Kilkenny, Limerick and 2 more |
| Protech Electrical and Security Ltd | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Longford and 7 more |
| ProWatt | Solar PV | Dublin, Kildare, Meath, Westmeath, Wicklow |
| Prowatt Electrical | Solar PV | Dublin |
| Ps electrical services | Solar PV | Kerry |
| PSL Mechanical | Heat pumps | Cavan |
| Pure Volt Limited | Solar PV | Wexford |
| PureVolt Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| PV Energy Ireland | Solar PV | Galway, Limerick, Longford, Mayo, Roscommon, Sligo |
| PV Generation Ltd. | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| PV Green | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| PV Solar Ireland | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| PV Solar Ireland / RCC Engineering | Solar PV | Galway |
| PV Solar Power Ltd | Solar PV | Dublin |
| PV Solar Systems | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| PVE Solar Limited | Solar PV | Dublin |
| PVGeneration Ltd | Solar PV | Monaghan |
| Q4 Energy | Solar PV | Carlow, Cavan, Clare, Cork, Dublin, Galway and 13 more |
| QES lTD | Solar PV | Dublin |
| QMAC CONTRACTING LIMITED | Solar PV | Wexford |
| QMAC Contracting Ltd T/A QMAC Electrical & Energy Solutions | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| QUILTER INSULATION LTD | Heat pumps | Galway |
| Quinn Plumbing | Heat pumps | Mayo |
| R T Communications Ltd | Solar PV | Kilkenny |
| R. Fitzgerald Electrical Services LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| R.D Ventures | Solar PV | Dublin |
| R.P Heating and Plumbing | Heat pumpsSolar water heating | Kerry |
| R.P Plumbing and Heating | Heat pumpsSolar water heating | Kerry |
| RABBITT H&P LTD t/a Western Energy Systems | Heat pumpsSolar water heating | Galway |
| Rainplumbing | Heat pumpsSolar water heating | Carlow |
| Ramor Renewables Heating & Plumbing LTD | Heat pumps | Westmeath |
| Randridge Smart EV Ltd ta Randridge Technologies | Solar PV | Wicklow |
| Rathmoy Plumbing & Heating ltd | Heat pumps | Tipperary |
| Ratoath Electrical | Solar PV | Dublin |
| Ray Carroll Electrical Ltd | Solar PV | Dublin |
| Ray Regan Electricial Ltd | Solar PV | Galway |
| Raymond Barrett Plumbing & Heating Ltd T/A On The Level | Heat pumps | Dublin |
| Raymond Barrett Plumbing & Heating Ltd TA On The Level | Heat pumps | Dublin |
| Raymond Carolan Electrical Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| raymond mullarkey plumbing and heating | Heat pumps | Sligo |
| RB Building Energy | Solar water heating | Leitrim |
| RB heating and plumbing Ltd | Heat pumps | Westmeath |
| RBK Construction Ltd | Heat pumps | Offaly |
| RC Electrical Services | Solar PV | Donegal |
| Rcb Electrical ltd | Solar PV | Laois |
| RCC engineering ltd | Solar PV | Kerry |
| RCI (www.solarinstallations.ie) | Solar PVSolar water heating | Dublin |
| RCPS Property Services Ltd. | Heat pumps | Dublin |
| RD Ventures Ltd | Solar PV | Dublin |
| Reade Plumbing Ltd | Heat pumps | Kildare |
| Realm Energy Solutions LTD | Solar PV | Louth, Westmeath |
| Red Electrical Engineering Ltd | Solar PV | Dublin, Kildare, Meath, Wexford, Wicklow |
| Reddington Group | Solar PV | Donegal, Galway, Leitrim, Longford, Mayo, Roscommon and 2 more |
| Redmond Electrical Services - Solargen | Solar PV | Tipperary |
| Redmond Gas And Electrical Ltd | Solar PV | Sligo |
| REenergy Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| REFS Engineering Ltd | Solar PV | Donegal |
| REL Cooling Services Ltd | Heat pumps | Carlow |
| Rem Heat ltd | Heat pumps | Tipperary |
| Rend Master Ltd | Heat pumps | Mayo |
| Rend Master LTD T/a Solar West | Solar PV | Mayo |
| Rend Master T/A Solar West | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Renehan Electrical | Solar PV | Cavan, Dublin, Kildare, Longford, Louth, Meath and 2 more |
| Renewable Energy Centre | Solar PV | Cork, Kerry, Limerick |
| Renewable Power Ireland | Solar PV | Carlow, Dublin, Kerry, Kildare, Laois, Meath and 1 more |
| Renewables Ireland ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| RenewaPump solutions Ltd | Heat pumps | Galway |
| RER Electrical | Solar PV | Cavan, Donegal, Dublin, Kildare, Laois, Leitrim and 7 more |
| RER Electrical & Solar Ltd T/A RER Energy | Solar PV | Cavan |
| Rescue Maintenance | Solar PV | Kildare |
| Resolute Engineering Group LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Response Plumbing Ltd | Heat pumps | Cork |
| ResTemp Solutions | Heat pumps | Cork |
| Retrofit Design Ltd | One Stop Shop | Clare, Cork, Kerry, Limerick |
| Retrofit Energy Ireland | One Stop Shop | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Revamp | Solar PV | Carlow, Dublin, Kerry, Kildare, Kilkenny, Laois and 6 more |
| RG Energy Services | Heat pumps | Kilkenny |
| Richard O' Sullivan Contractors Ltd | Solar PV | Kilkenny |
| Richard Sinnott Heating & Plumbing | Heat pumps | Tipperary |
| Right Group | Solar PV | Kerry |
| Riversdale Electrical Ltd | Solar PV | Carlow, Cavan, Dublin, Kildare, Kilkenny, Laois and 6 more |
| RJ Solar Energy | Solar PV | Clare, Cork, Dublin, Galway, Kerry, Kildare and 7 more |
| RJC Consulting and Engineering Ltd | Solar PV | Clare, Kildare, Westmeath |
| RL Butler & Sons LTD | Heat pumps | Wexford |
| RL Solar Solutions Ltd - Barrow Solar | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Tipperary and 3 more |
| RMI Services | Solar water heating | Galway |
| Robbie McGovern Ltd | Heat pumps | Limerick |
| Robert Hassey Electrical & Co Ltd | Solar PV | Wexford |
| Robert Smith Ltd | Solar PV | Cork |
| Rodge Conway Heating & Plumbing | Heat pumps | Kildare |
| Rodsley ltd t/a msg heating and plumbing | Heat pumps | Tipperary |
| RODSLEY LTD TRADING AS MSG plumbing and heating | Heat pumps | Wexford |
| ROL Electrical Testing T/A ROL Group | Solar PV | Dublin |
| ROL Testing Ltd T/a ROL Group | Solar PV | Dublin |
| Ronan Eivers | Heat pumps | Laois |
| Ronan McGrath Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Ronan O'Gorman Plumbing and Heating Limited | Heat pumps | Laois |
| Ronan plumbing and heating | Heat pumps | Kilkenny |
| Rookery Consulting Ltd T/a Pinergy Solar | Solar PV | Wexford |
| Rookery Consulting T/A Solar Electric | Solar PV | Tipperary |
| Rosa Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Roscoral Ltd | Heat pumps | Meath |
| Rosehill Renewables Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Roslem Solar Energies T/A David Connellan Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| ROSS MCCARTHY ELECTRICAL | Solar PV | Cork |
| Rostek Energy | Solar PV | Dublin |
| Royal Electrical Services Ltd | Solar PV | Meath |
| Royal Rebel Electrical Ltd | Solar PV | Mayo |
| Roycon Mechanical Services ltd | Heat pumps | Meath |
| RSM Plumbing & Heating Ltd | Heat pumps | Meath |
| RSP Electrical Services LTD | Solar PV | Kildare |
| RT Communications LTD T/A Quantum Solar | Solar PV | Clare, Cork, Galway, Kerry, Kildare, Kilkenny and 5 more |
| RTG Electrics | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| RTS Heating and Cooling Services | Heat pumpsSolar water heating | Offaly |
| Rutland Heating & Plumbing | Heat pumps | Carlow |
| RVR Energy Technology Ltd | Heat pumps | Galway |
| Ryan Building Solutions | Solar water heating | Carlow |
| Ryan Plumbing & Heating | Heat pumps | Dublin |
| S McGrath Electrical | Solar PV | Clare, Dublin, Galway, Laois, Limerick, Mayo and 4 more |
| S Murray Plumbing and Heating | Heat pumps | Roscommon |
| S. T. O’Connell Electrical | Solar PV | Kilkenny |
| S.Kiernan Electrical | Solar PV | Westmeath |
| SA plumbing and Heating LTD | Heat pumps | Galway |
| Sagar Electrical | Solar PV | Westmeath |
| Sandyford Electrical | Solar PV | Dublin |
| Santora Limited | Solar water heating | Dublin |
| Sapphire Security Ltd | Solar PV | Dublin, Kildare, Wexford, Wicklow |
| Saunderson PV Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Saunderson Solar | Solar PV | Meath |
| Save Me Money Wind and Solar Ltd | Solar PVSolar water heating | Dublin |
| Save Me Money Wind and Solar Ltd T/A Veep Energy | Solar PV | Dublin |
| SaveMeMoney Wind and Solar Ltd T/A Veep Energy | Solar PV | Dublin, Westmeath, Wexford |
| SB Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| SB Electrical/ Steven bracken | Solar PV | Offaly |
| SCB Plumbing Ltd | Heat pumps | Meath |
| SCULLYT AUTOMATION | Solar PV | Kildare |
| SE Systems | One Stop ShopSolar PV | Cork, Dublin, Kerry, Limerick, Tipperary, Waterford |
| Seamus Carroll Electrical LTD | Solar PV | Monaghan |
| Seamus Leonard Electrical | Solar PV | Dublin |
| Seamus Whelan | Heat pumps | Cork |
| Sean Allen Heating & Plumbing | Heat pumps | Kerry |
| Sean Byrnes | Solar PV | Kerry |
| Sean Egan Electrical | Solar PV | Donegal, Galway, Mayo, Meath, Sligo |
| Sean Gallagher | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Sean Hardiman Electrical | Solar PV | Galway |
| Sean Hardiman Electrical and Solar PV | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Sean Horan LTD | Solar PVSolar water heating | Mayo |
| Sean McCarthy Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Sean Smith Electrical | Solar PV | Dublin |
| Sean Sweeney Plumbing and Heating Limited | Heat pumps | Meath |
| Sean Tully Electrical Services | Solar PV | Cavan, Dublin, Leitrim, Longford, Louth, Meath and 2 more |
| Sean Windle | Heat pumps | Kerry |
| Seann McCann & Son | Heat pumps | Longford |
| SeanPaul Construction ltd | Heat pumps | Dublin |
| Secto Services Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Secure it right ltd | Solar PV | Kildare |
| Service Master Ireland | Heat pumps | Kildare |
| SES PV Ltd | Solar PV | Sligo |
| Seán costin plumbing & Heating Ltd | Heat pumps | Waterford |
| SGE Developments Limited | Solar PV | Clare, Dublin, Kildare, Laois, Limerick, Louth and 5 more |
| Shan Antony | Heat pumps | Kildare |
| Shane Dawson Heating & Plumbing Ltd. | Heat pumps | Meath |
| Shane Marmion Electrical | Solar PV | Limerick |
| Shane O'Rourke Heating and Plumbing L.T.D | Heat pumps | Laois |
| Shane O’Donovan Electrical Ltd | Solar PV | Cork |
| Shane Ryan Plumbing and Heating | Heat pumpsSolar water heating | Clare |
| Shane Scully Electrical | Solar PV | Laois |
| Shannonside Solar | Solar PV | Kilkenny |
| Sharp Mechanical Engineering | Heat pumps | Waterford |
| Shaun McCauley Electrical | Solar PV | Donegal |
| Shaun Mckenna | Solar PV | Leitrim |
| Shay Lalor Plumbing and Heating LTD | Heat pumps | Dublin |
| SHBC LTD trading as Henley Construction | Heat pumps | Cork |
| Sherlock Solar Ltd | Solar PV | Carlow, Dublin, Kildare, Laois, Louth, Meath and 1 more |
| Shiels O Sullivan Heating and Plumbing | Heat pumps | Galway |
| SHS Renweables Ltd | Renewable energy installers (biomass) | Kildare |
| Silverstream Renewables Ltd | Heat pumps | Mayo |
| SK Green Energy Technologies | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Skelect Limited | Solar PV | Dublin, Galway |
| Sky Electrical Engineering Ltd | Solar PV | Dublin |
| Skyline Solar Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Skyline/Solar Home | Solar PV | Dublin |
| Slix Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| SM Precision Plumbing | Heat pumps | Wexford |
| Smart Heat Solutions | Heat pumps | Offaly |
| Smart Heating Ltd | Heat pumpsSolar water heating | Laois |
| Smith solar | Solar PV | Westmeath |
| SMM Plumbing and Heating | Heat pumpsSolar water heating | Cork |
| Sol Power Solar Ltd T/A Shannon Side Solar Ltd | Solar PV | Carlow, Clare, Cork, Dublin, Galway, Kerry and 9 more |
| Sola | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solar Beo Ltd | Solar PV | Kerry |
| Solar Charge LTD | Solar PV | Kildare |
| Solar Choice Limited | Solar PV | Limerick |
| Solar Clarity Ltd | Solar PV | Dublin |
| Solar Compare | Solar PV | Leitrim |
| Solar Electric | Solar PV | Tipperary |
| Solar Elite | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solar Energy Solutions LTD | Solar PV | Donegal, Galway, Leitrim, Longford, Mayo, Roscommon and 2 more |
| Solar Fusion Electrical | Solar PV | Meath |
| Solar Generation LTD | Solar PV | Donegal, Leitrim, Longford, Mayo, Meath, Roscommon and 1 more |
| Solar Green PV LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solar Grid Energy Limited | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Longford and 6 more |
| Solar Installers Ireland | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solar Laois | Solar PV | Kildare, Laois |
| Solar Mode Ltd | Solar PV | Cork, Kilkenny, Tipperary, Waterford, Wexford |
| Solar Nexus | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solar Path | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solar Power Ireland BK Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solar Precision LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solar PV Donegal | Solar PV | Donegal, Leitrim, Sligo |
| Solar PV Energy | Solar PV | Cork |
| Solar PV Panels Ireland | Solar PV | Cavan, Dublin, Galway, Kildare, Kilkenny, Laois and 6 more |
| Solar Solutions | Solar PV | Kildare |
| Solar Solutions Ireland | Solar PV | Cork |
| Solar Works Electrical Contractors Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solar2Power | Solar PV | Carlow, Cork, Kilkenny, Tipperary, Waterford, Wexford |
| SolarCert | Solar PV | Dublin, Kildare, Meath |
| SolarCert Electrical Services | Solar PV | Donegal |
| Solarcraft Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solaregy Ltd T/a SOLA | Heat pumps | Meath |
| Solarhill Energy Ltd | Solar PV | Cork |
| Solaris Green Energy | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solarise Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| SolarShare Ltd | Solar PV | Dublin |
| Solarsmart Energy LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solarsource.ie | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| SOLARspan | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solarstream Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| SolarVolt Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solarweb Electrical Ltd | Solar PV | Carlow, Cork, Kildare, Kilkenny, Laois, Limerick and 3 more |
| Solarwise Energy Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solas Installations | Solar PV | Galway |
| Solceed limited | Solar PV | Dublin |
| Solec Solar Limited | Solar PV | Clare, Dublin, Galway, Kildare, Kilkenny, Limerick and 11 more |
| Solect complete services | Solar PV | Sligo |
| Solektric | Solar PV | Sligo |
| Solgrid Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solid Systems | Heat pumps | Limerick |
| Solis Green Energy Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solmatix Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solstice Renewables Solutions LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Solve Plumbing & Heating Technology Ltd | Solar water heating | Tipperary |
| Sonic Electrical | Solar PV | Clare |
| South Dublin Heating and Plumbing Ltd | Heat pumpsSolar water heating | Dublin |
| South East Solar | Solar PV | Wexford |
| Southern Solar Electrical | Solar PV | Cork, Dublin, Kerry, Limerick, Tipperary, Waterford |
| Southmark Plumbing | Heat pumps | Roscommon |
| Southwest Renewables | Solar PVHeat pumpsSolar water heating | Kerry |
| Southwest Solar Electrics & Renewables | Solar PV | Kildare, Limerick |
| SP Energy | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Specter Technics | Solar PV | Galway, Mayo |
| Spring Mechanical Ltd | Heat pumps | Kerry |
| SPV Energy | Solar PV | Cavan, Dublin, Kildare, Laois, Leitrim, Longford and 7 more |
| SQ9 Solar Ltd | Solar PV | Dublin, Kildare, Wicklow |
| SR Complete Plumbing Solutions Ltd | Heat pumps | Cork |
| SSE Airtricity Energy Services Ltd | One Stop Shop | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| SSP Electrical Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Stancu plumbing limited | Heat pumps | Westmeath |
| Starrs Heating and Plumbing Services | Solar water heating | Mayo |
| Start Solar Ireland Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Stefan Callaghan Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Stefan Plumbing and Heating | Heat pumps | Dublin |
| Stephen Broderick Electrical | Solar PV | Galway |
| Stephen H heating & Plumbing Ltd | Heat pumpsSolar water heating | Dublin |
| Stephen Hession | Heat pumps | Sligo |
| Stephen McGuinness Plumbing Ltd | Heat pumpsSolar water heating | Meath |
| Stephen O Connor Electrical Ltd | Solar PV | Kerry |
| Stephen Ryan Electrical Ltd | Solar PV | Kilkenny |
| Stephen Treacy Heating and Plumbing Ltd | Heat pumps | Dublin |
| Stephenstown Energy Services | Solar PV | Leitrim |
| Sterio Renewables | Heat pumps | Dublin |
| Steven Walsh Heating and Plumbing | Heat pumps | Westmeath |
| Stf renewable ltd | Heat pumps | Louth |
| Stone Arches Limited T/A Waterford Insulation | Heat pumps | Waterford |
| Strancor Heating & Plumbing Ltd | Heat pumps | Monaghan |
| Strategic Power Connect Limited | Solar PV | Dublin |
| Strauss Mechanical | Heat pumps | Kildare |
| Strict Electrical Ltd | Solar PV | Cavan, Dublin, Kildare, Louth, Meath, Monaghan |
| Stuart Nolan Plumbing & Heating | Solar water heating | Tipperary |
| Sugrue Solar | Solar PV | Cork, Kerry, Limerick |
| Sugruesolar | Solar PV | Galway |
| Sumera Ltd | Solar PV | Donegal |
| Sun Arc Solar Systems | Solar PV | Carlow |
| Sunergy Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Sunnybee Ltd | Solar PV | Dublin, Kilkenny, Waterford |
| Sunrea Solar Ltd | Solar PV | Clare, Galway, Laois, Limerick, Mayo, Offaly and 2 more |
| SunSmart Electrical Ltd | Solar PV | Cavan |
| Sunstream Energy Ltd | Solar PV | Carlow, Cork, Kilkenny, Tipperary, Waterford, Wexford |
| Sunvolt limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Superheat | Heat pumps | Kildare |
| Sure Systems D&M Ltd | Heat pumps | Meath |
| Surge Plumbing and Heating | Heat pumps | Wicklow |
| Swecks Ltd t/a D&B Electrical Maintenance | Solar PV | Cork |
| Swift Electrical | Solar PV | Kerry |
| Swift Electrical T/A Advance Solar | Solar PV | Carlow, Cavan, Dublin, Galway, Kildare, Kilkenny and 11 more |
| Switch Electrical | Solar PV | Dublin |
| Switch2Solar | Solar PV | Cavan, Clare, Dublin, Galway, Kildare, Laois and 10 more |
| SwitchElectrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Swyft Energy | Solar PV | Cork |
| T & V Plumbing & Heating Ltd | Heat pumps | Cavan |
| T MCNally Electrical Services | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| T Nolan Electrical Ltd | Solar PV | Kildare |
| T W Mc Kitterick Elec. Contrs Ltd | Solar PV | Mayo |
| T.W McKitterick Electrical Contractors Ltd | Solar PV | Cavan, Louth, Meath, Monaghan |
| TAC Construction | Heat pumps | Dublin |
| Tadhg O Keeffe & Sons | Solar PVSolar water heating | Clare, Cork |
| TAF PLUMBING LTD | Solar water heating | Galway |
| Tallon Electrical | Solar PV | Carlow |
| Tanner Electrical and Plumbing Services LTD | Solar PV | Cork |
| TCBHeating | Heat pumps | Dublin |
| TDE Group | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Teas Glas | Heat pumpsSolar water heating | Tipperary |
| Tec FM | Solar PV | Carlow, Dublin, Kildare, Kilkenny, Laois, Waterford |
| Teddy Kelleher Electrical ltd | Solar PV | Cork |
| Teeling Contracting T/A COMPASS | Heat pumps | Tipperary |
| TFM Electrical Services Ltd | Solar PV | Clare, Dublin, Galway, Mayo, Roscommon |
| The Cork Plumber | Heat pumps | Cork |
| The Gavigan Group | Solar PV | Longford, Meath, Offaly, Westmeath |
| The Heat Pump People | Solar water heating | Galway |
| The Heatpump People | Heat pumpsSolar water heating | Galway |
| The Powerhouse | Heat pumps | Dublin, Waterford |
| The Prism Group | Solar PV | Cavan |
| THERMO DYNAMIK | Heat pumps | Louth |
| Thermo Renewables Limited | Heat pumps | Westmeath |
| Thermocare | Heat pumps | Mayo |
| Thermotech Heating & Plumbing Ltd | Heat pumps | Longford |
| Thomas Harrington Heating & Plumbing LTD | Heat pumps | Galway |
| Thomas Maher Heating and Plumbing Ltd | Heat pumps | Tipperary |
| Thomas O'Reilly Heating and Plumbing Ltd | Heat pumps | Cavan |
| Thomas Taaffe Heating and Plumbing | Heat pumps | Sligo |
| Thomas Tobin | Solar PV | Cork |
| Tierney Mechanical Services Ltd | Heat pumps | Meath |
| Tile Rooms Ltd | Heat pumps | Meath |
| Tim O Mahony and Sons Ltd | Solar water heating | Cork |
| Tim O Sullivan Heating & Plumbing | Heat pumps | Kerry |
| Tirconaill Contracts Ltd | Heat pumps | Donegal |
| Tirconaill Renewables LTD | Solar PV | Donegal, Leitrim, Sligo |
| Tirconnaill Contracts Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Titan Electrical Ltd | Solar PV | Cavan, Donegal, Dublin, Leitrim, Longford, Louth and 3 more |
| Tj Quinn Heating & Plumbing Ltd | Heat pumps | Wexford |
| TJA Plumbing | Heat pumps | Kildare |
| TLPlumbserve Ltd | Heat pumps | Wicklow |
| TM Plumbing & Heating | Heat pumps | Limerick |
| TMC Complete Electrical Limited TA Solar Pv Energy | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| TMG Plumbing & Heating Services | Heat pumps | Offaly |
| TN Plumbing & Heating Ltd | Heat pumps | Galway |
| Tobin Electrical | Solar PV | Cork, Kerry, Limerick, Tipperary, Waterford |
| Tom Costello Electrical Ltd | Solar PV | Limerick |
| Tom Kennedy | Solar PV | Tipperary |
| Tom Morrissey | Solar PV | Tipperary |
| Tom Thompson | Solar PV | Laois |
| Tony Madden Plumbing & Heating Ltd | Heat pumps | Louth |
| Toolen PV | Solar PV | Cork |
| ToolenPV | Solar PVHeat pumpsSolar water heating | Cork |
| Top Fix Solar Ltd. | Solar PV | Kerry |
| Toro Security & Electrical Ltd | Solar PV | Meath |
| Town & Country Plumbing Ltd | Heat pumpsSolar water heating | Waterford |
| TP Gas Services | Heat pumps | Limerick |
| TRE Energy (IRL) Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Treacy Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Treaty Renewables Limited | Heat pumps | Kildare, Limerick |
| Tremac Engineering T/A Atlantic Energy Solutions | Heat pumps | Sligo |
| TRLP ltd T/A Daly Electrical | Solar PVHeat pumps | Louth |
| Troy heating and plumbing ltd | Heat pumps | Offaly |
| True North Electrical Ltd | Solar PV | Cork, Donegal |
| TT Electrician Operations Ltd | Solar PV | Westmeath |
| Tullamore Electrical Services Limited | Solar PV | Meath |
| Tullow Electrical Services Ltd / O'Neill & Sons Electrical Services | Solar PV | Carlow |
| Tungsten Engineering Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Tus Geal Teo | Solar PV | Cork |
| Vaughan Electrical | Solar PV | Clare |
| Venturi Heat SErvices | Heat pumpsSolar water heating | Carlow |
| Vercom Electrical T/A Solar Logic | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Vercom Electrical TA Solar Logic | Solar PV | Dublin |
| Verde Energy Group | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Verde Remediation Services Ltd | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Vinsok Ltd t/a Green House Ltd | Solar PV | Dublin |
| VIP Renovations | Heat pumps | Wexford |
| Virtue Engineering Ltd | Solar water heating | Louth |
| Vision Solar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| VKG Trading Ltd. | Heat pumps | Donegal |
| VM Electrical & Solar | Solar PV | Carlow, Cavan, Dublin, Kildare, Laois, Louth and 4 more |
| Voltique power limited | Solar PV | Kildare |
| Walls Electrical Services | Solar PV | Dublin |
| Walsh Domestic Technical Services | Heat pumps | Carlow |
| Walsh Electrical Services | Solar PV | Offaly |
| Walsh Heating and Cooling LTD | Solar PVHeat pumps | Cork, Wexford |
| Walshs Heating Plumbing and Renewables Ltd | Heat pumpsSolar water heating | Dublin |
| Warm Front Ltd | Heat pumps | Kerry |
| WaterSpark Engineering Ltd | Heat pumps | Kildare |
| Wattmasters Electrical Ltd | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Watts Up Electric | Solar PV | Kerry |
| WattSolar | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Wayne Moran T/A Aquarius Heating Solutions | Heat pumps | Wexford |
| WB Plumbing & Heating Solutions | Heat pumps | Tipperary |
| Welfit | Heat pumpsSolar water heating | Cork |
| West Cork Solar and Electrical | Solar PV | Cork |
| Western Heat Pump Services | Heat pumps | Galway |
| Western Renewables | Solar PV | Clare, Galway, Mayo, Westmeath |
| WestQuay Energy | Solar PV | Galway, Leitrim, Limerick, Mayo, Roscommon, Sligo |
| Westward construction ltd | Heat pumpsSolar water heating | Galway |
| Wheelock Electrical Services Ltd t/a GT Solar | Solar PV | Wexford |
| Whelan Electrical Engineering Ltd | Solar PV | Dublin |
| Whitty Security Ltd | Solar PV | Wexford |
| Whyte Melia Electrical LTD | Solar PV | Kildare |
| WiEnergy | One Stop Shop | Carlow, Dublin, Kildare, Kilkenny, Laois, Offaly and 4 more |
| Wilde plumbing and heating ltd | Heat pumps | Wexford |
| William Rooney | Solar PV | Carlow |
| William Sheehan | Solar water heating | Dublin |
| William Walsh Plumbing Contractors Ltd | Heat pumps | Offaly |
| Willie Cronly Electrical | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Wilson Controls Limited | Solar PV | Dublin |
| Wired Electrical Services | Solar PV | Waterford |
| WiseHeat.ie Heat pump Solutions | Heat pumps | Carlow |
| Wixted Electrical | Solar PV | Carlow, Cork, Kildare, Kilkenny, Laois, Limerick and 3 more |
| Wizer Energy Ltd | Solar PV | Carlow, Clare, Cork, Dublin, Galway, Kerry and 12 more |
| Wm Black and Sons (Contracting) Ltd | Solar water heating | Cork |
| Wolfe plumbing and heating services Ltd | Heat pumps | Dublin |
| WPM Construction Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| WRB Energy LTD | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Wyse Solar Solutions | Solar PVSolar water heating | Donegal |
| Wyse Solar Solutions/Wyse Electrical | Solar PV | Dublin |
| ZAP Electric | Solar PV | Waterford |
| Zensol Limited | Solar PV | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| Zetta Home Services Ltd | Solar PVHeat pumps | Carlow, Cavan, Clare, Cork, Donegal, Dublin and 20 more |
| ZS Plumbing & Heating | Solar water heating | Louth |
| ÓgEngineering Ltd | Solar PV | Dublin |
Contact details are on SEAI's official register. We do not republish phone numbers or email addresses here, because a public list of 1,800 direct contacts gets harvested by spammers within days. If you would rather not ring around, tell us what you need and we will introduce you to installers who cover your area.
Tell us the upgrade and where you are. We introduce SEAI registered installers who work in your area, and you compare quotes.
SEAI publishes three downloadable registers covering 1,834 companies in the Republic of Ireland. There are more registered contractors than that, because the Better Energy Homes register covering insulation, heating controls, windows and doors and air to water heat pumps is not published as a list.
Registration means the company has met SEAI's criteria to carry out grant aided work and appears on the official register. It is not a quality guarantee or an endorsement, and registration can be withdrawn. Always get more than one quote and check references.
Yes. Individual SEAI grants are only paid where the work was carried out by a contractor registered for that measure. Using your own builder, however good, will void the grant.
The counties shown are the areas each company told SEAI it covers. Some cover the whole country, some cover one county. Coverage changes, so it is worth asking even if your county is not listed.
It was last rebuilt from the official registers on 27 August 2026. SEAI updates its registers continuously, so check the official page before you commit to anything.