Company lists · Data refreshed September 2026

Top 25 Residential energy efficiency companies based in Ireland

Name: Residential energy efficiency companies based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 135 companies tracked

RevenueBase identified 135 company matches for residential energy efficiency companies associated with Ireland as of September 2026 and tracks 1,629 professional contacts across them, including 389 with verified work emails. Dublin is the largest hub.

This list covers company matches for residential energy efficiency companies associated with Ireland, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 17, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 17, 2026 How this list was built

135Companies

1,629Contacts tracked

389Verified emails

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The 25 largest residential energy efficiency companies based in Ireland

Ranked by team size

Top 25 of 135 company matches for residential energy efficiency companies based in Ireland, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 17, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	SSE Airtricity	Exact match	IrelandHQ recorded Sep 17, 2026	501-1,000	661 contacts →
	Exact match “SSE Airtricity has been harnessing our greatest natural resource for the past 25 years, providing cleaner, renewable energy† for homes and businesses across the country.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
2	SE Systems	Exact match	Cork, IrelandHQ recorded Sep 17, 2026	51-200	59 contacts →
	Exact match “SE Systems (Sustainable Energy Systems) is Ireland's leading energy solutions provider.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
3	Swyft Energy	Exact match	Bishopstown, IrelandHQ recorded Sep 17, 2026	51-200	56 contacts →
	Exact match “Swyft Energy is an online platform that streamlines energy efficient upgrades for homeowner’s saving them time, hassle and money.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
4	Energystore	Exact match	Holywood, IrelandHQ recorded Sep 17, 2026	51-200	44 contacts →
	Exact match “Energystore is rethinking construction with free-flowing insulation.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
5	Electric Ireland Superhomes	Exact match	Thurles, IrelandHQ recorded Sep 17, 2026	11-50	43 contacts →
	Exact match “Electric Ireland Superhomes is a One Stop Shop which looks after all the key stages of a home energy retrofit, from retrofit design through to project completion and management of…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
6	Ashgrove Renewables	Exact match	Cork, IrelandHQ recorded Sep 17, 2026	51-200	33 contacts →
	Exact match “We take great pride in our data-driven, scientific approach to energy solutions, spearheaded by a team known for its experience and creative design skills.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
7	Verde Energy Group	Exact match	Little Island, IrelandHQ recorded Sep 17, 2026	11-50	31 contacts →
	Exact match “Verde Energy Group Delivering energy cost savings and carbon reduction solutions to Commercial & Industrial businesses since 2009.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
8	Solarsmart Energy LTD	Exact match	Dublin, IrelandHQ recorded Sep 17, 2026	11-50	26 contacts →
	Exact match “SolarSmart enables Irish homeowners, farmers and business owners to generate and harness their own electricity supply from sunlight.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
9	Kore Retrofit	Exact match	Kilnaleck, IrelandHQ recorded Sep 17, 2026	11-50	22 contacts →
	Exact match “KORE Retrofit is your one-stop shop for full domestic, commercial and community-based deep retrofit & project management services in Ireland.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
10	House 2 Home Retrofit LTD	Exact match	Dublin 12, IrelandHQ recorded Sep 17, 2026	11-50	20 contacts →
	Exact match “House 2 Home has been Ireland's leading 'one stop shop' for energy upgrades since 2013.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
11	Passive House Systems	Exact match	Cork, IrelandHQ recorded Sep 17, 2026	11-50	19 contacts →
	Exact match “Passive House Systems is a leading supplier of energy conserving products used in domestic new-build and retrofit building projects.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
12	Clean Energy Ireland	Exact match	Aherla, IrelandHQ recorded Sep 17, 2026	11-50	18 contacts →
	Exact match “We offer customers the best products, services and advice to help lower energy costs and reduce their carbon footprint.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
13	Energlaze Home Energy Upgrades	Exact match	Wexford, IrelandHQ recorded Sep 17, 2026	11-50	17 contacts →
	Exact match “At Energlaze Home Energy Upgrades, not only are we committed to improving the overall comfort of your home, but we are also focused on reducing your energy costs and can help you…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
14	Symphony Energy	Exact match	Wicklow, IrelandHQ recorded Sep 17, 2026	11-50	17 contacts →
	Exact match “Symphony Energy is a global leader in optimising energy performance in the commercial built environment.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
15	JFW Renewables	Exact match	Loughrea, IrelandHQ recorded Sep 17, 2026	11-50	16 contacts →
	Exact match “Solar PV Installation Specialist, with a wide range of products to suit your home or commercial building to save you money on electricity costs, reduce your carbon footprint and…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
16	Breffni Insulation	Exact match	Kilnaleck, IrelandHQ recorded Sep 17, 2026	11-50	14 contacts →
	Exact match “Breffni Insulation was founded in 2006 and the company is registered and compliant with standards as per the National Standards Authority of Ireland (NSAI), Sustainable Energy…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
17	NRG Panel	Exact match	Castleblayney, IrelandHQ recorded Sep 17, 2026	51-200	14 contacts →
	Exact match “NRG Panel are one of Ireland's leading installers of solar panels and air to water heat pumps.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
18	ENCON	Exact match	Waterford, IrelandHQ recorded Sep 17, 2026	11-50	14 contacts →
	Exact match “Encon is a sustainable building, retrofit, and renewables company committed to transforming how Ireland builds, renovates, and powers its spaces.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
19	Copper Coast Renewables	Exact match	Waterford, IrelandHQ recorded Sep 17, 2026	1-10	12 contacts →
	Exact match “We are your Energy Saving Net-Zero Partner At Copper Coast Renewables, we offer world class energy savings to your business through innovative green technologies such as Solar PV…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
20	Nusolas Energy	Exact match	Shannon, IrelandHQ recorded Sep 17, 2026	51-200	11 contacts →
	Exact match “NuSolas Energy is helping homes and businesses across Ireland transition to clean energy with solar panels and heat pumps.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
21	Blackwell Energy	Exact match	Dublin 6, IrelandHQ recorded Sep 17, 2026	51-200	9 contacts →
	Exact match “Blackwell Energy design, supply & install home and business energy services such as solar PV, air source heat pumps, retrofit underfloor heating, air conditioning, deep retrofit…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
22	Envirobead LTD	Exact match	Cork, IrelandHQ recorded Sep 17, 2026	11-50	9 contacts →
	Exact match “Your #OneStopShop SEAI approved specialists with complete home energy upgrade solutions.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
23	Lennon Solar	Exact match	IrelandHQ recorded Sep 17, 2026	11-50	9 contacts →
	Exact match “At lennon solar, we are passionate about providing sustainable and affordable energy solutions to our clients.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
24	Integrate Home Energy Upgrades	Exact match	Newtownmountkennedy, IrelandHQ recorded Sep 17, 2026	1-10	8 contacts →
	Exact match “Integrate Home Energy Upgrades is a One-Stop-Shop retrofit service provider based in Wicklow town.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
25	Ecovolt LTD	Exact match	Rosemount Business Park, IrelandHQ recorded Sep 17, 2026	11-50	8 contacts →
	Exact match “EcoVolt Ltd is an Irish company at the forefront of designing and manufacturing sustainable electric solutions for modern buildings.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “residential energy efficiency companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 135 residential energy efficiency companies based in Ireland

See the full list, filter by size, metro and specialty, and access 389 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Residential energy efficiency companies based in Ireland at a glance

As of Sep 17, 2026

23.9%Verified-email coverage

12.1Average contacts per company

11-50Median size (employees)

11.9%Largest-city concentration · Dublin

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

Email recency for this list is measured worldwide rather than for Ireland, so it is reported there. Company counts and contact totals on this page are exact for Ireland, over 135 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Ireland whose business descriptions match “residential energy efficiency companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 389 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 17, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “residential energy efficiency companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many residential energy efficiency companies are there based in Ireland?

RevenueBase identified 135 company matches for residential energy efficiency companies associated with Ireland as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

SSE Airtricity tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most residential energy efficiency companies?

Dublin leads with 16 company records, followed by Cork (8) and Waterford (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 389 professional contacts with verified work emails tracked across these 135 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 17, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.