Company lists · Data refreshed September 2026

Top 25 Sustainable energy consulting firms based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 144 companies tracked

RevenueBase identified 144 sustainable energy consulting firms headquartered in Ireland as of September 2026 and tracks 1,102 professional contacts across them, including 566 with verified work emails. Dublin is the largest hub.

This list covers sustainable energy consulting firms 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 21, 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 21, 2026 86% judged on-target in blind review

144Companies

1,102Contacts tracked

566Verified emails

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The 25 largest sustainable energy consulting firms based in Ireland

Ranked by team size

Top 25 of 144 sustainable energy consulting firms based in Ireland, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable energy consulting firms: 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	Pinergy	Partial evidence	Dublin, IrelandHQ checked Sep 21, 2026	51-200	100 contacts →
	Partial evidence “Pinergy is an energy transition company We’re helping our customers make data informed choices today, to take control of their energy tomorrows.” Source: RevenueBase Database · checked Sep 21, 2026
2	SE Systems	Strong evidence	Cork, IrelandHQ checked Sep 21, 2026	51-200	59 contacts →
	Strong evidence “SE Systems (Sustainable Energy Systems) is Ireland's leading energy solutions provider.” Source: RevenueBase Database · checked Sep 21, 2026
3	Varming Consulting Engineers LTD	Indirect evidence	Dundrum, IrelandHQ checked Sep 21, 2026	11-50	55 contacts →
	Indirect evidence “At Varming, we’re all about cutting-edge design and meticulous oversight of mechanical and electrical services, whether it’s for brand-new constructions or revitalizing existing…” Source: RevenueBase Database · checked Sep 21, 2026
4	Galetech Group	Strong evidence	Stradone, IrelandHQ checked Sep 21, 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 21, 2026
5	Climeaction	Indirect evidence	Cork, IrelandHQ checked Sep 21, 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 21, 2026
6	Ashgrove Renewables	Partial evidence	Cork, IrelandHQ checked Sep 21, 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 21, 2026
7	KSN Energy	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	51-200	32 contacts →
	Indirect evidence “Complex operations made simple.” Source: RevenueBase Database · checked Sep 21, 2026
8	Alternative Energy Ireland	Partial evidence	Dublin 12, IrelandHQ checked Sep 21, 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 21, 2026
9	Horizon Energy Group HEG	Partial evidence	Cork, IrelandHQ checked Sep 21, 2026	11-50	26 contacts →
	Partial evidence “Horizon Energy Group delivers technology-led solutions that reduce energy costs, cut carbon and unlock new revenue opportunities.” Source: RevenueBase Database · checked Sep 21, 2026
10	Lawler Sustainability	Partial evidence	Kilkenny, IrelandHQ checked Sep 21, 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 21, 2026
11	Enviroguide A DNV Company	Strong evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	22 contacts →
	Strong evidence “Enviroguide Consulting has an established reputation for delivering environmental and sustainability consultancy services including ecology, environmental impact assessment…” Source: RevenueBase Database · checked Sep 21, 2026
12	KSN Horizon	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	21 contacts →
	Indirect evidence “Climate change, ESG requirements and the transition to a low-carbon economy are reshaping the future of real estate.” Source: RevenueBase Database · checked Sep 21, 2026
13	Antaris Consulting	Strong evidence	Limerick, IrelandHQ checked Sep 21, 2026	11-50	20 contacts →
	Strong evidence “Founded in 1994, Antaris is an independent, Irish-owned consultancy and training firm with expertise in ISO Management Systems, Environment, Energy, Sustainability and Climate…” Source: RevenueBase Database · checked Sep 21, 2026
14	Brightwind	Partial evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	18 contacts →
	Partial evidence “Be confident in your wind investment decisions with BrightWind." BrightWind provides a boutique resource and energy assessment service led by leading analysts with over 100+ years…” Source: RevenueBase Database · checked Sep 21, 2026
15	Plan Energy	Partial evidence	Sligo, IrelandHQ checked Sep 21, 2026	11-50	18 contacts →
	Partial evidence “Welcome to Plan Energy, your trusted partner in decarbonisation and renewable energy.” Source: RevenueBase Database · checked Sep 21, 2026
16	Mosart	Strong evidence	IrelandHQ checked Sep 21, 2026	11-50	17 contacts →
	Strong evidence “Providing expert design, energy consulting & training in high performance buildings since 1993.” Source: RevenueBase Database · checked Sep 21, 2026
17	Azorom	Partial evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	16 contacts →
	Partial evidence “AZOROM provides advisory services to organisations operating in the energy sector in Ireland and Worldwide.” Source: RevenueBase Database · checked Sep 21, 2026
18	Passive Dynamics	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	15 contacts →
	Indirect evidence “Passive Dynamics was set up in 2020 with a vision that expert knowledge and passion can empower.” Source: RevenueBase Database · checked Sep 21, 2026
19	Systemcore	Partial evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	15 contacts →
	Partial evidence “We are the next generation of M&E consulting engineers, dedicated to designing systems for low-carbon, intelligent, self-optimising spaces that enhance occupant well-being, and…” Source: RevenueBase Database · checked Sep 21, 2026
20	Digren Energy	Partial evidence	Co. Dublin, IrelandHQ checked Sep 21, 2026	11-50	14 contacts →
	Partial evidence “We are an energy management consultancy.” Source: RevenueBase Database · checked Sep 21, 2026
21	Sustainabilityworks Ireland	Partial evidence	Dublin, IrelandHQ checked Sep 21, 2026	1-10	14 contacts →
	Partial evidence “SustainabilityWorks is a consultancy on a mission to accelerate climate action and sustainability in Ireland.” Source: RevenueBase Database · checked Sep 21, 2026
22	Lp3	Partial evidence	Galway, IrelandHQ checked Sep 21, 2026	11-50	13 contacts →
	Partial evidence “LP3 is an experienced and dynamic company providing specialist and dedicated services to the Renewable Energy sector across Ireland.” Source: RevenueBase Database · checked Sep 21, 2026
23	ENX	Strong evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	13 contacts →
	Strong evidence “Mechanical, Electrical and Sustainability Consulting Engineers” Source: RevenueBase Database · checked Sep 21, 2026
24	Copper Coast Renewables	Partial evidence	Waterford, IrelandHQ checked Sep 21, 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 21, 2026
25	JAK Consulting Engineers	Strong evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	12 contacts →
	Strong evidence “JAK Consulting Engineers is a leading multi-award winning MEP design and sustainable energy consultancy firm in Ireland, UK, Middle East and Asia.” Source: RevenueBase Database · checked Sep 21, 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 consulting firms. 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 consulting firms.
Partial evidence: Its own public description names part of sustainable energy consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable energy consulting firms. 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 144 sustainable energy consulting firms based in Ireland

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Sustainable energy consulting firms based in Ireland at a glance

As of Sep 21, 2026

51.4%Verified-email coverage

7.7Average contacts per company

1-10Median size (employees)

23.6%Largest-city concentration · Dublin

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 144 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 consulting firms, 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 consulting firms”. 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 consulting firms), 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 consulting firms, 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, 566 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 21, 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 consulting firms by metro

Sustainable energy consulting firms in Dublin34

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 consulting firms, 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 consulting firms are there based in Ireland?

RevenueBase identified 144 sustainable energy consulting firms 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?

Pinergy, headquartered in Dublin, tops this list with the largest team on record.

Which city has the most sustainable energy consulting firms?

Dublin leads with 34 headquartered companies, followed by Cork (11) 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 566 verified decision-maker contacts tracked across these 144 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 21, 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.