Company lists · Data refreshed September 2026

Top 25 Clean tech companies based in Ireland

Name: Clean tech companies based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 100 companies tracked

RevenueBase identified 100 clean tech companies headquartered in Ireland as of September 2026 and tracks 53,760 professional contacts across them, including 7,298 with verified work emails. Dublin is the largest hub.

This list covers clean tech 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 19, 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 19, 2026 86% judged on-target in blind review

100Companies

53,760Contacts tracked

7,298Verified emails

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The 25 largest clean tech companies based in Ireland

Ranked by team size

Top 25 of 100 clean tech companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to clean tech 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	Johnson Controls	Indirect evidence	Cork, IrelandHQ checked Sep 19, 2026	10001+	52,736 contacts →
	Indirect evidence “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Source: RevenueBase Database · checked Sep 19, 2026
2	Astatine LTD	Indirect evidence	Dublin, IrelandHQ checked Sep 19, 2026	51-200	90 contacts →
	Indirect 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 19, 2026
3	PV Generation LTD	Indirect evidence	Glanmire, IrelandHQ checked Sep 19, 2026	11-50	64 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
4	SE Systems	Indirect evidence	Cork, IrelandHQ checked Sep 19, 2026	51-200	59 contacts →
	Indirect evidence “SE Systems (Sustainable Energy Systems) is Ireland's leading energy solutions provider.” Source: RevenueBase Database · checked Sep 19, 2026
5	20fifty Partners	Indirect evidence	Limerick, IrelandHQ checked Sep 19, 2026	51-200	48 contacts →
	Indirect evidence “Developing a workforce ready to meet today’s sustainability needs has never been more important.” Source: RevenueBase Database · checked Sep 19, 2026
6	Power Capital Renewable Energy	Indirect evidence	Dublin 2, IrelandHQ checked Sep 19, 2026	11-50	47 contacts →
	Indirect 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 19, 2026
7	Galetech Group	Partial evidence	Stradone, IrelandHQ checked Sep 19, 2026	51-200	45 contacts →
	Partial 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 19, 2026
8	Climeaction	Indirect evidence	Cork, IrelandHQ checked Sep 19, 2026	11-50	42 contacts →
	Indirect evidence “Climeaction Cork & Boston \| B Corp Certified \| ISO 9001 & Accredited Climeaction is an industrial decarbonisation and carbon intelligence company.” Source: RevenueBase Database · checked Sep 19, 2026
9	Verde Energy Group	Indirect evidence	Little Island, IrelandHQ checked Sep 19, 2026	11-50	31 contacts →
	Indirect evidence “Verde Energy Group Delivering energy cost savings and carbon reduction solutions to Commercial & Industrial businesses since 2009.” Source: RevenueBase Database · checked Sep 19, 2026
10	Alternative Energy Ireland	Indirect evidence	Dublin 12, IrelandHQ checked Sep 19, 2026	1-10	27 contacts →
	Indirect evidence “Renewable Energy installation company specialising in taking a broad view of a companies' energy requirements.” Source: RevenueBase Database · checked Sep 19, 2026
11	Lawler Sustainability	Indirect evidence	Kilkenny, IrelandHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “Helping Businesses Cut Energy Costs by up to 50% & Accelerate Their Journey to Net Zero!” Source: RevenueBase Database · checked Sep 19, 2026
12	Urbanvolt	Indirect evidence	Dublin, IrelandHQ checked Sep 19, 2026	11-50	23 contacts →
	Indirect evidence “UrbanVolt is a global leader in financing decarbonised solutions for businesses, helping companies achieve their sustainability goals through innovative energy solutions.” Source: RevenueBase Database · checked Sep 19, 2026
13	DP Energy Group	Indirect evidence	Buttevant, IrelandHQ checked Sep 19, 2026	11-50	22 contacts →
	Indirect evidence “Head quartered in Buttevant, Co.” Source: RevenueBase Database · checked Sep 19, 2026
14	House 2 Home Retrofit LTD	Indirect evidence	Dublin 12, IrelandHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “House 2 Home has been Ireland's leading 'one stop shop' for energy upgrades since 2013.” Source: RevenueBase Database · checked Sep 19, 2026
15	Plan Energy	Indirect evidence	Sligo, IrelandHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “Welcome to Plan Energy, your trusted partner in decarbonisation and renewable energy.” Source: RevenueBase Database · checked Sep 19, 2026
16	Clean Energy Ireland	Indirect evidence	Aherla, IrelandHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect 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 19, 2026
17	JFW Renewables	Indirect evidence	Loughrea, IrelandHQ checked Sep 19, 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 19, 2026
18	Actionzero	Indirect evidence	Cork, IrelandHQ checked Sep 19, 2026	51-200	14 contacts →
	Indirect evidence “ActionZero is an industry leader, creating and deploying groundbreaking, self-funding solutions for a zero-emissions world across industrial, enterprise and consumer global…” Source: RevenueBase Database · checked Sep 19, 2026
19	NRG Panel	Indirect evidence	Castleblayney, IrelandHQ checked Sep 19, 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 19, 2026
20	ENCON	Indirect evidence	Waterford, IrelandHQ checked Sep 19, 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 19, 2026
21	Greensource LTD	Indirect evidence	Limerick, IrelandHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “Greensource is an Irish renewable energy group that focuses on sustainable power generation.” Source: RevenueBase Database · checked Sep 19, 2026
22	Copper Coast Renewables	Indirect evidence	Waterford, IrelandHQ checked Sep 19, 2026	1-10	12 contacts →
	Indirect 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 19, 2026
23	Highfield Energy Services Limited	Indirect evidence	Kilgobbin Road, IrelandHQ checked Sep 19, 2026	1-10	11 contacts →
	Indirect evidence “Highfield Energy develop electricity generation projects with a particular focus on renewables.” Source: RevenueBase Database · checked Sep 19, 2026
24	Nusolas Energy	Partial evidence	Shannon, IrelandHQ checked Sep 19, 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 19, 2026
25	Ecohouse Developments Limited	Indirect evidence	Dublin, IrelandHQ checked Sep 19, 2026	51-200	8 contacts →
	Indirect evidence “We are a tight knit in‐house team of designers, architects and builders, committed to creating beautiful, energy efficient homes and buildings, working towards a passive standard.” Source: RevenueBase Database · checked Sep 19, 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: clean tech 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 clean tech companies.
Partial evidence: Its own public description names part of clean tech companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clean tech 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 100 clean tech companies based in Ireland

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Clean tech companies based in Ireland at a glance

As of Sep 19, 2026

13.6%Verified-email coverage

537.6Average contacts per company

11-50Median size (employees)

17.0%Largest-city concentration · Dublin

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 100 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 clean tech 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 “clean tech 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 clean tech 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 clean tech 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, 7,298 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 19, 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 clean tech 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 clean tech companies are there based in Ireland?

RevenueBase identified 100 clean tech 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?

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

Which city has the most clean tech companies?

Dublin leads with 17 headquartered companies, followed by Cork (6) and Waterford (3).

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 7,298 verified decision-maker contacts tracked across these 100 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 19, 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.