Company lists · Data refreshed September 2026

Top 25 Hydrogen electrolyzer companies worldwide

Name: Hydrogen electrolyzer companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 1,018 companies tracked

RevenueBase identified 1,018 hydrogen electrolyzer companies worldwide as of September 2026 and tracks 16,021 professional contacts across them, including 6,145 with verified work emails. The United States is the largest market and London the largest hub.

This list covers hydrogen electrolyzer companies worldwide, 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 20, 2026. Country and city lists for hydrogen electrolyzer companies follow the table.

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 20, 2026 86% judged on-target in blind review

1,018Companies

16,021Contacts tracked

6,145Verified emails

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The 25 largest hydrogen electrolyzer companies worldwide

Ranked by team size

Top 25 of 1,018 hydrogen electrolyzer companies worldwide, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to hydrogen electrolyzer 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	Thyssenkrupp Nucera	Indirect evidence	Dortmund, GermanyHQ checked Sep 20, 2026	1,001-5,000	691 contacts →
	Indirect evidence “thyssenkrupp nucera offers world-leading technologies for high-efficiency electrolysis plants.” Source: RevenueBase Database · checked Sep 20, 2026
2	Neuman & Esser NEA Group	Indirect evidence	Übach-palenberg, GermanyHQ checked Sep 20, 2026	1,001-5,000	606 contacts →
	Indirect evidence “NEUMAN & ESSER is a reliable partner to the industry, driving both the energy transition and the circular economy with integrated solutions for the energy infrastructure of…” Source: RevenueBase Database · checked Sep 20, 2026
3	Ohmium	Partial evidence	Fremont, United StatesHQ checked Sep 20, 2026	501-1,000	547 contacts →
	Partial evidence “Ohmium's mission is to accelerate the adoption of green hydrogen to decarbonize hard-to-abate sectors and enable a low-carbon future.” Source: RevenueBase Database · checked Sep 20, 2026
4	Sunfire	Indirect evidence	Dresden, GermanyHQ checked Sep 20, 2026	501-1,000	427 contacts →
	Indirect evidence “Established in 2010 and based in Dresden, Germany, Sunfire is a world-leading industrial electrolysis company with two differentiated technologies.” Source: RevenueBase Database · checked Sep 20, 2026
5	Quest ONE	Partial evidence	Augsburg, GermanyHQ checked Sep 20, 2026	501-1,000	378 contacts →
	Partial evidence “As a technological pioneer, Quest One develops and produces innovative PEM electrolyzers and electrolyzer stacks.” Source: RevenueBase Database · checked Sep 20, 2026
6	Electric Hydrogen	Strong evidence	Devens, MA, United StatesHQ checked Sep 20, 2026	201-500	346 contacts →
	Strong evidence “Electric Hydrogen manufactures, delivers and commissions the world’s most powerful electrolyzers to make clean hydrogen projects economically viable today.” Source: RevenueBase Database · checked Sep 20, 2026
7	NEL Hydrogen	Partial evidence	Oslo, NorwayHQ checked Sep 20, 2026	201-500	327 contacts →
	Partial evidence “Nel has a history tracing back to 1927 and is today a leading pure play hydrogen electrolyser technology company with a global presence.” Source: RevenueBase Database · checked Sep 20, 2026
8	ITM Power	Indirect evidence	Sheffield, United KingdomHQ checked Sep 20, 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 20, 2026
9	Neom Green Hydrogen Company	Partial evidence	Tabuk, Saudi ArabiaHQ checked Sep 20, 2026	51-200	260 contacts →
	Partial evidence “NEOM Green Hydrogen Company (NGHC) is on a mission to make a carbon-free, climate-safe future a reality.” Source: RevenueBase Database · checked Sep 20, 2026
10	Corvus Energy	Indirect evidence	Bergen, BC, NorwayHQ checked Sep 20, 2026	201-500	235 contacts →
	Indirect evidence “Corvus Energy is the world’s leading supplier of safe, innovative and reliable zero-emission solutions for maritime, offshore, port, and subsea applications-in the form of marine…” Source: RevenueBase Database · checked Sep 20, 2026
11	LHYFE	Indirect evidence	Nantes, FranceHQ checked Sep 20, 2026	51-200	210 contacts →
	Indirect evidence “Lhyfe is a certain idea of the world, a world in which we can meet our energy needs by being part of the natural ecosystem rather than trying to dominate it.” Source: RevenueBase Database · checked Sep 20, 2026
12	Greenlight Innovation Corp	Partial evidence	Burnaby, BC, CanadaHQ checked Sep 20, 2026	201-500	191 contacts →
	Partial evidence “Greenlight Innovation is the leading global supplier of testing and manufacturing solutions for hydrogen fuel cells, electrolysers, and lithium batterie packs.” Source: RevenueBase Database · checked Sep 20, 2026
13	Elogen	Partial evidence	Les Ulis, FranceHQ checked Sep 20, 2026	51-200	179 contacts →
	Partial evidence “ELOGEN is a technology provider specialized in the design, the manufacturing and the maintenance of Hydrogen generators using water electrolysis, based on Proton Exchange Membrane…” Source: RevenueBase Database · checked Sep 20, 2026
14	Enapter	Partial evidence	Saerbeck, ItalyHQ checked Sep 20, 2026	201-500	168 contacts →
	Partial evidence “Enapter develops and manufactures AEM Electrolysers – disruptive devices producing green hydrogen to replace fossil fuels.” Source: RevenueBase Database · checked Sep 20, 2026
15	Newen Systems Pvt. LTD	Indirect evidence	Vadodara, IndiaHQ checked Sep 20, 2026	51-200	167 contacts →
	Indirect evidence “At Newen Systems, we are driving the future of clean energy with cutting-edge Battery Energy Storage Systems (BESS) and DC-coupled solutions.” Source: RevenueBase Database · checked Sep 20, 2026
16	RIX Industries	Partial evidence	Benicia, CA, United StatesHQ checked Sep 20, 2026	51-200	152 contacts →
	Partial evidence “Serving critical infrastructure markets, RIX Industries is a global leader in the design, development, and manufacturing of hydrogen and gas generation systems, precision high…” Source: RevenueBase Database · checked Sep 20, 2026
17	AFC Energy	Partial evidence	Cranleigh, United KingdomHQ checked Sep 20, 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 20, 2026
18	Symbio	Indirect evidence	St.-Fons, FranceHQ checked Sep 20, 2026	501-1,000	149 contacts →
	Indirect evidence “Symbio is a leading technology and industrial partner for sustainable mobility pioneers.” Source: RevenueBase Database · checked Sep 20, 2026
19	Powercell Group	Partial evidence	Gothenburg, SwedenHQ checked Sep 20, 2026	51-200	147 contacts →
	Partial evidence “PowerCell develops and produces hydrogen electric fuel cell stacks and systems with a uniquely high power density, targeting applications in the aviation, marine, power…” Source: RevenueBase Database · checked Sep 20, 2026
20	MCPHY	Strong evidence	Foussemagne, FranceHQ checked Sep 20, 2026	201-500	145 contacts →
	Strong evidence “As a leading "pure player" McPhy designs and manufactures a range of hydrogen production and valorization equipment, including electrolyzers built on robust and proven technology…” Source: RevenueBase Database · checked Sep 20, 2026
21	Genvia	Indirect evidence	Béziers, FranceHQ checked Sep 20, 2026	51-200	144 contacts →
	Indirect evidence “Today, and for decades, global warming is a reality.” Source: RevenueBase Database · checked Sep 20, 2026
22	AM Green Group	Indirect evidence	United StatesHQ checked Sep 20, 2026	51-200	131 contacts →
	Indirect evidence “AM Green is indirectly wholly owned and controlled by the founders of Hyderabad-based Greenko Group - Anil Chalamalasetty and Mahesh Kolli.” Source: RevenueBase Database · checked Sep 20, 2026
23	Oneh2, INC	Indirect evidence	Longview, NC, United StatesHQ checked Sep 20, 2026	51-200	130 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
24	Frames	Indirect evidence	Alphen Aan Den Rijn, NetherlandsHQ checked Sep 20, 2026	201-500	127 contacts →
	Indirect evidence “As of December 2021, Frames is part of Plug Power.” Source: RevenueBase Database · checked Sep 20, 2026
25	Friem S.P.A	Indirect evidence	Segrate, ItalyHQ checked Sep 20, 2026	51-200	125 contacts →
	Indirect evidence “FRIEM is an Italian company founded in 1950, specialized in high-power energy conversion systems for industrial applications and the energy transition.” Source: RevenueBase Database · checked Sep 20, 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: hydrogen electrolyzer 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 hydrogen electrolyzer companies.
Partial evidence: Its own public description names part of hydrogen electrolyzer companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hydrogen electrolyzer 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 1,018 hydrogen electrolyzer companies worldwide

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Hydrogen electrolyzer companies worldwide at a glance

As of Sep 20, 2026

38.4%Verified-email coverage

15.7Average contacts per company

11-50Median size (employees)

1.3%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

489

11-50

340

51-200

124

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 hydrogen electrolyzer 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.
Coverage: Every country. Country and city lists for hydrogen electrolyzer companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “hydrogen electrolyzer 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 hydrogen electrolyzer 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 hydrogen electrolyzer companies, and records with no verified work email.
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, 6,145 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 20, 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.

Hydrogen electrolyzer companies by location

10 lists · largest first

Every Hydrogen electrolyzer companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 hydrogen electrolyzer 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 hydrogen electrolyzer companies are there worldwide?

RevenueBase identified 1,018 hydrogen electrolyzer companies worldwide 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?

Thyssenkrupp Nucera, headquartered in Dortmund, tops this list with the largest team on record.

Which country has the most hydrogen electrolyzer companies?

The United States leads with 158 companies, followed by Germany (94) and the United Kingdom (67). Every hydrogen electrolyzer companies list by country and city is linked on this page.

Which city has the most hydrogen electrolyzer companies?

London leads with 13 headquartered companies, followed by Singapore (12) and Shanghai (10).

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 6,145 verified decision-maker contacts tracked across these 1,018 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 20, 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.