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 residential energy efficiency companies headquartered in 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 residential energy efficiency companies headquartered in Ireland, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 17, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 17, 2026 86% judged on-target in blind review

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 residential energy efficiency companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to residential energy efficiency companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	SSE Airtricity	Partial evidence	IrelandHQ checked Sep 17, 2026	501-1,000	661 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 17, 2026
2	SE Systems	Partial evidence	Cork, IrelandHQ checked Sep 17, 2026	51-200	59 contacts →
	Partial evidence “SE Systems (Sustainable Energy Systems) is Ireland's leading energy solutions provider.” Source: RevenueBase Database · checked Sep 17, 2026
3	Swyft Energy	Strong evidence	Bishopstown, IrelandHQ checked Sep 17, 2026	51-200	56 contacts →
	Strong evidence “Swyft Energy is an online platform that streamlines energy efficient upgrades for homeowner’s saving them time, hassle and money.” Source: RevenueBase Database · checked Sep 17, 2026
4	Energystore	Partial evidence	Holywood, IrelandHQ checked Sep 17, 2026	51-200	44 contacts →
	Partial evidence “Energystore is rethinking construction with free-flowing insulation.” Source: RevenueBase Database · checked Sep 17, 2026
5	Electric Ireland Superhomes	Partial evidence	Thurles, IrelandHQ checked Sep 17, 2026	11-50	43 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
6	Ashgrove Renewables	Partial evidence	Cork, IrelandHQ checked Sep 17, 2026	51-200	33 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 17, 2026
7	Verde Energy Group	Partial evidence	Little Island, IrelandHQ checked Sep 17, 2026	11-50	31 contacts →
	Partial evidence “Verde Energy Group Delivering energy cost savings and carbon reduction solutions to Commercial & Industrial businesses since 2009.” Source: RevenueBase Database · checked Sep 17, 2026
8	Solarsmart Energy LTD	Indirect evidence	Dublin, IrelandHQ checked Sep 17, 2026	11-50	26 contacts →
	Indirect evidence “SolarSmart enables Irish homeowners, farmers and business owners to generate and harness their own electricity supply from sunlight.” Source: RevenueBase Database · checked Sep 17, 2026
9	Kore Retrofit	Indirect evidence	Kilnaleck, IrelandHQ checked Sep 17, 2026	11-50	22 contacts →
	Indirect evidence “KORE Retrofit is your one-stop shop for full domestic, commercial and community-based deep retrofit & project management services in Ireland.” Source: RevenueBase Database · checked Sep 17, 2026
10	House 2 Home Retrofit LTD	Partial evidence	Dublin 12, IrelandHQ checked Sep 17, 2026	11-50	20 contacts →
	Partial evidence “House 2 Home has been Ireland's leading 'one stop shop' for energy upgrades since 2013.” Source: RevenueBase Database · checked Sep 17, 2026
11	Passive House Systems	Partial evidence	Cork, IrelandHQ checked Sep 17, 2026	11-50	19 contacts →
	Partial evidence “Passive House Systems is a leading supplier of energy conserving products used in domestic new-build and retrofit building projects.” Source: RevenueBase Database · checked Sep 17, 2026
12	Clean Energy Ireland	Partial evidence	Aherla, IrelandHQ checked Sep 17, 2026	11-50	18 contacts →
	Partial evidence “We offer customers the best products, services and advice to help lower energy costs and reduce their carbon footprint.” Source: RevenueBase Database · checked Sep 17, 2026
13	Energlaze Home Energy Upgrades	Partial evidence	Wexford, IrelandHQ checked Sep 17, 2026	11-50	17 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
14	Symphony Energy	Partial evidence	Wicklow, IrelandHQ checked Sep 17, 2026	11-50	17 contacts →
	Partial evidence “Symphony Energy is a global leader in optimising energy performance in the commercial built environment.” Source: RevenueBase Database · checked Sep 17, 2026
15	JFW Renewables	Indirect evidence	Loughrea, IrelandHQ checked Sep 17, 2026	11-50	16 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
16	Breffni Insulation	Partial evidence	Kilnaleck, IrelandHQ checked Sep 17, 2026	11-50	14 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
17	NRG Panel	Indirect evidence	Castleblayney, IrelandHQ checked Sep 17, 2026	51-200	14 contacts →
	Indirect evidence “NRG Panel are one of Ireland's leading installers of solar panels and air to water heat pumps.” Source: RevenueBase Database · checked Sep 17, 2026
18	ENCON	Indirect evidence	Waterford, IrelandHQ checked Sep 17, 2026	11-50	14 contacts →
	Indirect evidence “Encon is a sustainable building, retrofit, and renewables company committed to transforming how Ireland builds, renovates, and powers its spaces.” Source: RevenueBase Database · checked Sep 17, 2026
19	Copper Coast Renewables	Partial evidence	Waterford, IrelandHQ checked Sep 17, 2026	1-10	12 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
20	Nusolas Energy	Partial evidence	Shannon, IrelandHQ checked Sep 17, 2026	51-200	11 contacts →
	Partial evidence “NuSolas Energy is helping homes and businesses across Ireland transition to clean energy with solar panels and heat pumps.” Source: RevenueBase Database · checked Sep 17, 2026
21	Blackwell Energy	Partial evidence	Dublin 6, IrelandHQ checked Sep 17, 2026	51-200	9 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
22	Envirobead LTD	Partial evidence	Cork, IrelandHQ checked Sep 17, 2026	11-50	9 contacts →
	Partial evidence “Your #OneStopShop SEAI approved specialists with complete home energy upgrade solutions.” Source: RevenueBase Database · checked Sep 17, 2026
23	Lennon Solar	Partial evidence	IrelandHQ checked Sep 17, 2026	11-50	9 contacts →
	Partial evidence “At lennon solar, we are passionate about providing sustainable and affordable energy solutions to our clients.” Source: RevenueBase Database · checked Sep 17, 2026
24	Integrate Home Energy Upgrades	Partial evidence	Newtownmountkennedy, IrelandHQ checked Sep 17, 2026	1-10	8 contacts →
	Partial evidence “Integrate Home Energy Upgrades is a One-Stop-Shop retrofit service provider based in Wicklow town.” Source: RevenueBase Database · checked Sep 17, 2026
25	Ecovolt LTD	Indirect evidence	Rosemount Business Park, IrelandHQ checked Sep 17, 2026	11-50	8 contacts →
	Indirect evidence “EcoVolt Ltd is an Irish company at the forefront of designing and manufacturing sustainable electric solutions for modern buildings.” Source: RevenueBase Database · checked Sep 17, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: residential energy efficiency companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names residential energy efficiency companies.
Partial evidence: Its own public description names part of residential energy efficiency companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name residential energy efficiency companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 135 residential energy efficiency companies based in Ireland

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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

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among residential energy efficiency companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Ireland whose own description of what they do matches “residential energy efficiency companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names residential energy efficiency companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among residential energy efficiency companies, and records with no verified work email. Companies headquartered outside Ireland are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 389 across the full list. 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.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names residential energy efficiency companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

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

RevenueBase identified 135 residential energy efficiency companies headquartered in Ireland as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

SSE Airtricity, headquartered in Ireland, tops this list with the largest team on record.

Which city has the most residential energy efficiency companies?

Dublin leads with 16 headquartered companies, 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 the top results, verified emails and direct dials included. Upgrading unlocks all 389 verified decision-maker contacts tracked across these 135 companies.

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 Smart Search, 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.