Company lists · Data refreshed September 2026
Top 25 Green hydrogen consulting firms based in the United States
RevenueBase identified 144 green hydrogen consulting firms headquartered in the United States as of September 2026 and tracks 3,283 professional contacts across them, including 1,515 with verified work emails. Houston is the largest hub.
This list covers green hydrogen consulting firms headquartered in the United States, 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.
The 25 largest green hydrogen consulting firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,037 contacts → | ||||
Strong evidence “Plug is building an end-to-end green hydrogen ecosystem, from production, storage and delivery to energy generation, to help its customers meet their business goals and…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 434 contacts → | ||||
Partial evidence “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 130 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 58 contacts → | ||||
Indirect evidence “We believe that what’s good for our planet is good for business.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 52 contacts → | ||||
Partial evidence “BayoTech is committed to addressing the global need for reliable, cost-effective and low-carbon hydrogen.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 35 contacts → | ||||
Strong evidence “Ecolectro is revolutionizing green hydrogen production with our groundbreaking Anion Exchange Membrane (AEM) technology, enabling affordable and sustainable hydrogen generation…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 31 contacts → | ||||
Strong evidence “Green hydrogen today is too expensive, driven by sunk costs in fossil technologies, existing infrastructure, and decades of doing things the old way.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 28 contacts → | ||||
Partial evidence “Renewable energy consulting firm offering customized solutions for industrial and agricultural portfolios across the country.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 28 contacts → | ||||
Indirect evidence “Information Trends is a premier market research firm based in Sterling, Virginia.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 25 contacts → | ||||
Partial evidence “Hyperion Companies was founded in 2011 with the goal of bringing a new wave of clean energy to the market in the form of hydrogen.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 13 contacts → | ||||
Strong evidence “We are a privately held green hydrogen production company working to make 100% zero-carbon renewable fuel alternatives widely available across the United States.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 13 contacts → | ||||
Strong evidence “Green hydrogen represents one of our planet’s best hopes for a sustainable future.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 13 contacts → | ||||
Partial evidence “We produce hydrogen using less energy, at less cost and with less impact to your business We don’t burn natural gas, we process it and produce what’s called Turquoise hydrogen.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 10 contacts → | ||||
Partial evidence “Ally Power is moving the country to a carbon-free future with our unique two-pronged approach to hydrogen fuel.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 10 contacts → | ||||
Strong evidence “Founded in 2019, the Green Hydrogen Coalition (GHC) is the only 501(c)3 non-profit dedicated to deploying green hydrogen at scale for multi-sectoral decarbonization.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 9 contacts → | ||||
Strong evidence “Splitwaters is the leading electrolyzer manufacturer and engineering, procurement, and construction (EPC) company in Houston, TX, and has revolutionized the way green hydrogen…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 7 contacts → | ||||
Partial evidence “HydrogenXT – Changing the Way the World Moves HydrogenXT, headquartered in Houston, Texas is at the forefront of a seismic shift in global energy production, pioneering a clean…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 6 contacts → | ||||
Strong evidence “E9 develops modular Green Hydrogen Production Systems from 100 kW - 100 MW.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 6 contacts → | ||||
Strong evidence “The Green Hydrogen Company Engineering | Manufacturing | Contracting” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 6 contacts → | ||||
Partial evidence “EPC - Is the premier hydrogen infrastructure design, procurement, construction, and fabrication company leading the charge towards a sustainable hydrogen future.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 5 contacts → | ||||
Indirect evidence “Energy is one of the fundamental forces behind human progress and at Aurivos we are passionate about building and helping companies to deliver affordable energy in a sustainable…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 5 contacts → | ||||
Partial evidence “We are an engineering design firm serving the renewable energy, hydrogen and traditional oil & gas industries.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 5 contacts → | ||||
Strong evidence “HNO International is a green hydrogen systems design, integration and product development company.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 5 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 5 contacts → | ||||
Strong evidence “Avina is a pioneer in the green hydrogen sector with an advanced and diverse portfolio of clean hydrogen plants under development and access to proprietary technology solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
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: green hydrogen 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 green hydrogen consulting firms.
- Partial evidence
- Its own public description names part of green hydrogen consulting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name green hydrogen 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 green hydrogen consulting firms based in the United States
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Green hydrogen consulting firms based in the United States at a glance
As of Sep 21, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, 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 green hydrogen 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 the United States whose own description of what they do matches “green hydrogen 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 green hydrogen 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 green hydrogen consulting firms, and records with no verified work email. Companies headquartered outside United States 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, 1,515 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.
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 green hydrogen 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 green hydrogen consulting firms are there based in the United States?
RevenueBase identified 144 green hydrogen consulting firms headquartered in the United States 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?
Plug Power, headquartered in Latham, tops this list with the largest team on record.
Which city has the most green hydrogen consulting firms?
Houston leads with 17 headquartered companies, followed by New York (9) and Austin (7).
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 1,515 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.
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