Company lists · Data refreshed September 2026

Top 25 Sustainable hydrogen manufacturers based in the United Kingdom

Name: Sustainable hydrogen manufacturers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 18, 2026 91 companies tracked

RevenueBase identified 91 sustainable hydrogen manufacturers headquartered in the United Kingdom as of September 2026 and tracks 5,617 professional contacts across them, including 2,164 with verified work emails. London is the largest hub.

This list covers sustainable hydrogen manufacturers headquartered in the United Kingdom, 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

91Companies

5,617Contacts tracked

2,164Verified emails

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The 25 largest sustainable hydrogen manufacturers based in the United Kingdom

Ranked by team size

Top 25 of 91 sustainable hydrogen manufacturers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 18, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable hydrogen manufacturers: 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	RES	Partial evidence	Kings Langley, United KingdomHQ checked Sep 18, 2026	1,001-5,000	3,721 contacts →
	Partial evidence “RES is the world’s largest independent renewable energy company, working across 24 countries and active in wind, solar, energy storage, green hydrogen, transmission, and…” Source: RevenueBase Database · checked Sep 18, 2026
2	ITM Power	Indirect evidence	Sheffield, United KingdomHQ checked Sep 18, 2026	201-500	285 contacts →
	Indirect evidence “ITM Power was founded in and ITM Power plc was admitted to the AIM market of the London Stock Exchange in 2004.” Source: RevenueBase Database · checked Sep 18, 2026
3	AFC Energy	Partial evidence	Cranleigh, United KingdomHQ checked Sep 18, 2026	51-200	149 contacts →
	Partial evidence “AFC Energy is the leading provider of Hydrogen fuel cell technology to generate clean off-grid energy.” Source: RevenueBase Database · checked Sep 18, 2026
4	Geopura	Indirect evidence	Newcastle, United KingdomHQ checked Sep 18, 2026	51-200	137 contacts →
	Indirect evidence “GeoPura has a totally zero emissions answer to how we’re going to generate and distribute the vast amount of energy required to decarbonise our global economies.” Source: RevenueBase Database · checked Sep 18, 2026
5	Ylem Energy	Indirect evidence	Manchester, United KingdomHQ checked Sep 18, 2026	51-200	51 contacts →
	Indirect evidence “YLEM Energy is a leading independent power generation specialist with more than three decades’ experience in building, owning and operating smart generation systems.” Source: RevenueBase Database · checked Sep 18, 2026
6	Clean Power Hydrogen PLC	Partial evidence	Doncaster, United KingdomHQ checked Sep 18, 2026	51-200	50 contacts →
	Partial evidence “For too long, hydrogen was held back.” Source: RevenueBase Database · checked Sep 18, 2026
7	Bohr Limited	Partial evidence	Stone, United KingdomHQ checked Sep 18, 2026	51-200	49 contacts →
	Partial evidence “We're focused on delivering products and solutions to the green energy industry with a strong focus on Hydrogen, Biomethane and Natural Gas.” Source: RevenueBase Database · checked Sep 18, 2026
8	Ryze Power	Indirect evidence	Oxford, United KingdomHQ checked Sep 18, 2026	51-200	33 contacts →
	Indirect evidence “Ryze Power provides complete solutions in the alternative fuels space as sectors transition towards net zero.” Source: RevenueBase Database · checked Sep 18, 2026
9	LOGAN	Partial evidence	Edinburgh, United KingdomHQ checked Sep 18, 2026	11-50	30 contacts →
	Partial evidence “Based in Scotland, Logan is a designer, supplier, and integrator of complete hydrogen production, refuelling, compression, storage, dispensing and fuel cell solutions.” Source: RevenueBase Database · checked Sep 18, 2026
10	Hive Energy	Indirect evidence	East Wellow, United KingdomHQ checked Sep 18, 2026	201-500	29 contacts →
	Indirect evidence “Hive Energy is on a mission to save the planet.” Source: RevenueBase Database · checked Sep 18, 2026
11	Hygen Energy	Partial evidence	Oxford, United KingdomHQ checked Sep 18, 2026	11-50	25 contacts →
	Partial evidence “Hygen is a leading developer, producer and asset owner of low-carbon hydrogen production facilities in the UK and Europe, focusing on the decarbonisation of mobility…” Source: RevenueBase Database · checked Sep 18, 2026
12	Green CAT Hydrogen LTD	Partial evidence	Edinburgh, United KingdomHQ checked Sep 18, 2026	11-50	24 contacts →
	Partial evidence “Green Cat Hydrogen develops green hydrogen projects.” Source: RevenueBase Database · checked Sep 18, 2026
13	KEW Technology	Partial evidence	Birmingham, United KingdomHQ checked Sep 18, 2026	51-200	23 contacts →
	Partial evidence “KEW Technology is a UK based sustainable energy solutions company.” Source: RevenueBase Database · checked Sep 18, 2026
14	EET Hydrogen	Partial evidence	Stanlow, United KingdomHQ checked Sep 18, 2026	11-50	22 contacts →
	Partial evidence “EET Hydrogen is a leading player in the energy transition and is developing the first large scale, low carbon hydrogen production hub in the UK.” Source: RevenueBase Database · checked Sep 18, 2026
15	Carlton Power Limited	Indirect evidence	Stokesley, United KingdomHQ checked Sep 18, 2026	11-50	21 contacts →
	Indirect evidence “Carlton Power Group is an independent, UK energy development company formed in 1995, with offices in Stokesley, North Yorkshire and Edinburgh.” Source: RevenueBase Database · checked Sep 18, 2026
16	N-Gen	Partial evidence	Leeds, United KingdomHQ checked Sep 18, 2026	11-50	16 contacts →
	Partial evidence “At N-Gen, we’re helping our customers to lead the race towards decarbonisation with low carbon hydrogen.” Source: RevenueBase Database · checked Sep 18, 2026
17	Oort Energy	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	11-50	14 contacts →
	Strong evidence “Oort Energy is a manufacturer of green hydrogen systems for energy storage and clean fuel.” Source: RevenueBase Database · checked Sep 18, 2026
18	Regener8 Power	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	1-10	13 contacts →
	Partial evidence “Regener8 Power is a sustainable and ethical renewable energy company.” Source: RevenueBase Database · checked Sep 18, 2026
19	Pluszero LTD	Partial evidence	Edinburgh, United KingdomHQ checked Sep 18, 2026	1-10	10 contacts →
	Partial evidence “PlusZero Ltd is Making Hydrogen Happen - Our PlusZero Energy brand produces green hydrogen, with our first production site in the Outer Hebrides, the most rapidly scalable…” Source: RevenueBase Database · checked Sep 18, 2026
20	Clyde Hydrogen Systems	Partial evidence	Glasgow, United KingdomHQ checked Sep 18, 2026	1-10	9 contacts →
	Partial evidence “Clyde Hydrogen System’s breakthrough decoupled electrolysis technology delivers high pressure green hydrogen at scale and at low cost.” Source: RevenueBase Database · checked Sep 18, 2026
21	Hywaves	Partial evidence	Cranfield University, United KingdomHQ checked Sep 18, 2026	1-10	9 contacts →
	Partial evidence “HyWaves' goal is to increase locally produced hydrogen by simplifying solar to hydrogen power electronics and enhancing electrolysers to increase green hydrogen production.” Source: RevenueBase Database · checked Sep 18, 2026
22	Elemental Energy	Partial evidence	Kington St. Michael, United KingdomHQ checked Sep 18, 2026	11-50	8 contacts →
	Partial evidence “Elemental Energy enables 24/7 power at scale, on or off the grid, using a combination of renewables, battery storage, and hydrogen technology in an integrated, compact power unit.” Source: RevenueBase Database · checked Sep 18, 2026
23	H2tec Limited	Indirect evidence	Wallyford, United KingdomHQ checked Sep 18, 2026	1-10	8 contacts →
	Indirect evidence “At H2Tec, we are enabling an ultra-low and zero-emission future for power, heat and transport.” Source: RevenueBase Database · checked Sep 18, 2026
24	Hyenergy Consultancy Limited	Partial evidence	Crowthorne, United KingdomHQ checked Sep 18, 2026	1-10	7 contacts →
	Partial evidence “HyEnergy is a consultancy specialising in the pulling together of the disparate hydrogen and energy communities to foster, deliver and understand opportunities for new technical…” Source: RevenueBase Database · checked Sep 18, 2026
25	First Hydrogen	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	1-10	7 contacts →
	Strong evidence “First Hydrogen is fast becoming the leading designer and manufacturer of zero-emission, long-range hydrogen-powered utility vehicles.” 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 hydrogen manufacturers. 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 hydrogen manufacturers.
Partial evidence: Its own public description names part of sustainable hydrogen manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable hydrogen manufacturers. 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 91 sustainable hydrogen manufacturers based in the United Kingdom

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Sustainable hydrogen manufacturers based in the United Kingdom at a glance

As of Sep 18, 2026

38.5%Verified-email coverage

61.7Average contacts per company

11-50Median size (employees)

22.0%Largest-city concentration · London

Sep 18, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 91 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 hydrogen manufacturers, 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 the United Kingdom whose own description of what they do matches “sustainable hydrogen manufacturers”. 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 hydrogen manufacturers), 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 hydrogen manufacturers, and records with no verified work email. Companies headquartered outside United Kingdom 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, 2,164 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.

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 hydrogen manufacturers, 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 hydrogen manufacturers are there based in the United Kingdom?

RevenueBase identified 91 sustainable hydrogen manufacturers headquartered in the United Kingdom 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?

RES, headquartered in Kings Langley, tops this list with the largest team on record.

Which city has the most sustainable hydrogen manufacturers?

London leads with 20 headquartered companies, followed by Edinburgh (4) and Manchester (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 2,164 verified decision-maker contacts tracked across these 91 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.