Company lists · Data refreshed September 2026

Top 25 Sustainable energy contractors based in Ireland

Name: Sustainable energy contractors based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 18, 2026 205 companies tracked

RevenueBase identified 205 sustainable energy contractors headquartered in Ireland as of September 2026 and tracks 54,549 professional contacts across them, including 7,612 with verified work emails. Dublin is the largest hub.

This list covers sustainable energy contractors 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 18, 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 18, 2026 86% judged on-target in blind review

205Companies

54,549Contacts tracked

7,612Verified emails

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The 25 largest sustainable energy contractors based in Ireland

Ranked by team size

Top 25 of 205 sustainable energy contractors based in Ireland, ranked by team size, largest first. Data refreshed Sep 18, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable energy contractors: 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	Johnson Controls	Partial evidence	Cork, IrelandHQ checked Sep 18, 2026	10001+	52,736 contacts →
	Partial evidence “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Source: RevenueBase Database · checked Sep 18, 2026
2	Activ8 Solar Energies	Indirect evidence	Carrickmacross, IrelandHQ checked Sep 18, 2026	201-500	109 contacts →
	Indirect evidence “As Ireland's solar experts, we've been providing solar technology to both residential and commercial clients for over 18 years.” Source: RevenueBase Database · checked Sep 18, 2026
3	Astatine LTD	Partial evidence	Dublin, IrelandHQ checked Sep 18, 2026	51-200	90 contacts →
	Partial evidence “Astatine is a leading innovator in energy and C02 reduction solutions, particularly in the decarbonisation of industrial high - grade heat (incl.” Source: RevenueBase Database · checked Sep 18, 2026
4	Energywise Ireland	Partial evidence	Cork, IrelandHQ checked Sep 18, 2026	51-200	66 contacts →
	Partial evidence “Energywise Ireland is a trusted SEAI-registered one stop shop that offers a convenient solution for designing, supplying, and installing renewable energy solutions We cater for…” Source: RevenueBase Database · checked Sep 18, 2026
5	PV Generation LTD	Indirect evidence	Glanmire, IrelandHQ checked Sep 18, 2026	11-50	64 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 18, 2026
6	SE Systems	Strong evidence	Cork, IrelandHQ checked Sep 18, 2026	51-200	59 contacts →
	Strong evidence “SE Systems (Sustainable Energy Systems) is Ireland's leading energy solutions provider.” Source: RevenueBase Database · checked Sep 18, 2026
7	BNRG	Indirect evidence	Dublin, IrelandHQ checked Sep 18, 2026	11-50	49 contacts →
	Indirect evidence “At BNRG, partnerships are paramount.” Source: RevenueBase Database · checked Sep 18, 2026
8	Power Capital Renewable Energy	Partial evidence	Dublin 2, IrelandHQ checked Sep 18, 2026	11-50	47 contacts →
	Partial evidence “At Power Capital Renewable Energy we are driven by our purpose to contribute to the regeneration of our planet and its people.” Source: RevenueBase Database · checked Sep 18, 2026
9	Galetech Group	Strong evidence	Stradone, IrelandHQ checked Sep 18, 2026	51-200	45 contacts →
	Strong evidence “Galetech Group is a leading Irish renewable energy company delivering smart, end-to-end clean energy solutions for clients across wind, solar, energy storage, sustainable…” Source: RevenueBase Database · checked Sep 18, 2026
10	Ecoplex Energy	Partial evidence	Dublin, IrelandHQ checked Sep 18, 2026	51-200	40 contacts →
	Partial evidence “Your trusted Irish partner in delivering clean energy solutions for modern feelgood living and productivity – the freedom to harness your own zero-emission, zero-cost energy for…” Source: RevenueBase Database · checked Sep 18, 2026
11	Ashgrove Renewables	Partial evidence	Cork, IrelandHQ checked Sep 18, 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 18, 2026
12	Verde Energy Group	Partial evidence	Little Island, IrelandHQ checked Sep 18, 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 18, 2026
13	Alternative Energy Ireland	Partial evidence	Dublin 12, IrelandHQ checked Sep 18, 2026	1-10	27 contacts →
	Partial evidence “Renewable Energy installation company specialising in taking a broad view of a companies' energy requirements.” Source: RevenueBase Database · checked Sep 18, 2026
14	Solarsmart Energy LTD	Indirect evidence	Dublin, IrelandHQ checked Sep 18, 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 18, 2026
15	Planet Blue Energy	Partial evidence	Dublin, IrelandHQ checked Sep 18, 2026	1-10	24 contacts →
	Partial evidence “Planet Blue Energy has a mission to bring solar PV solutions to every corner of Ireland.” Source: RevenueBase Database · checked Sep 18, 2026
16	Lawler Sustainability	Partial evidence	Kilkenny, IrelandHQ checked Sep 18, 2026	11-50	24 contacts →
	Partial evidence “Helping Businesses Cut Energy Costs by up to 50% & Accelerate Their Journey to Net Zero!” Source: RevenueBase Database · checked Sep 18, 2026
17	DP Energy Group	Indirect evidence	Buttevant, IrelandHQ checked Sep 18, 2026	11-50	22 contacts →
	Indirect evidence “Head quartered in Buttevant, Co.” Source: RevenueBase Database · checked Sep 18, 2026
18	House 2 Home Retrofit LTD	Partial evidence	Dublin 12, IrelandHQ checked Sep 18, 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 18, 2026
19	Clean Energy Ireland	Partial evidence	Aherla, IrelandHQ checked Sep 18, 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 18, 2026
20	Sunbird	Indirect evidence	Cork, IrelandHQ checked Sep 18, 2026	11-50	17 contacts →
	Indirect evidence “Sunbird is a Pan-European and UK solar PV developer led by an experienced team of Commercial and Industrial (C&I) specialists with decades of experience in developing, financing…” Source: RevenueBase Database · checked Sep 18, 2026
21	JFW Renewables	Indirect evidence	Loughrea, IrelandHQ checked Sep 18, 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 18, 2026
22	Frontline Energy	Partial evidence	Dublin 4, IrelandHQ checked Sep 18, 2026	11-50	15 contacts →
	Partial evidence “We are energy innovators and pride ourselves in delivering an end to end range of expertise for the built environment that saves energy, carbon, time and cost.” Source: RevenueBase Database · checked Sep 18, 2026
23	Ideal Energy Distribution	Partial evidence	Dublin, IrelandHQ checked Sep 18, 2026	11-50	14 contacts →
	Partial evidence “Ideal Energy Distribution Ltd is a 100% Irish owned company committed to the Design, Specification, Supply and after sales service of renewable and energy products for both the…” Source: RevenueBase Database · checked Sep 18, 2026
24	NRG Panel	Indirect evidence	Castleblayney, IrelandHQ checked Sep 18, 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 18, 2026
25	ENCON	Partial evidence	Waterford, IrelandHQ checked Sep 18, 2026	11-50	14 contacts →
	Partial 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 18, 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: sustainable energy contractors. 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 sustainable energy contractors.
Partial evidence: Its own public description names part of sustainable energy contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable energy contractors. 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 205 sustainable energy contractors based in Ireland

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Sustainable energy contractors based in Ireland at a glance

As of Sep 18, 2026

14.0%Verified-email coverage

266.1Average contacts per company

11-50Median size (employees)

14.6%Largest-city concentration · Dublin

Sep 18, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

10001+

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 205 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 sustainable energy contractors, 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 “sustainable energy contractors”. 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 sustainable energy contractors), 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 sustainable energy contractors, 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, 7,612 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 18, 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.

Sustainable energy contractors by metro

Sustainable energy contractors in Dublin30

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 sustainable energy contractors, 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 sustainable energy contractors are there based in Ireland?

RevenueBase identified 205 sustainable energy contractors 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?

Johnson Controls, headquartered in Milwaukee, tops this list with the largest team on record.

Which city has the most sustainable energy contractors?

Dublin leads with 30 headquartered companies, followed by Cork (6) and Galway (5).

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 7,612 verified decision-maker contacts tracked across these 205 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 18, 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.