Company lists · Data refreshed September 2026
Top 25 Hydrogen consulting firms based in the United States
RevenueBase identified 128 hydrogen consulting firms headquartered in the United States as of September 2026 and tracks 792 professional contacts across them, including 336 with verified work emails and 318 with mobile numbers. Houston is the largest hub.
This list covers 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 hydrogen consulting firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | Oneh2, INCIndirect evidence | 128 | |||
Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 2 | 46 | ||||
“EXCEL has evolved over the last four decades to meet the needs of the nuclear energy industry.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 3 | Steelhead CompositesIndirect evidence | 33 | |||
“Steelhead Composites is a world-class advanced manufacturing company, based in Golden, Colorado (USA).” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 4 | Stillwater Associates LLCIndirect evidence | 28 | |||
“At Stillwater, our associates leverage decades of work at major oil companies to help clients navigate challenges with the highest level of industry knowledge, strategic thinking…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 5 | 28 | ||||
“Information Trends is a premier market research firm based in Sterling, Virginia.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 6 | Krishnan & Associates, INCPartial evidence | 27 | |||
“Krishnan & Associates (K&A) is a full service power and energy industry consulting firm providing specialized marketing, market analytics, mergers & acquisitions and recruitment…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 7 | 23 | ||||
“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: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 8 | 20 | ||||
“INNOVATIVE TECHNOLOGY PARTNERSHIPS LLC (ITP) conducts consulting for High Reliability Organizations (HROs) in the nuclear community.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 9 | 20 | ||||
“HOS Resources is a Lafayette, Louisiana-based energy consulting company.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 10 | 17 | ||||
“H2C is committed to accelerating the hydrogen economy by providing a breakthrough in the transportation and infrastructure required to bring green hydrogen to market now at a…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 11 | 14 | ||||
“We are an Atlanta-based energy research and consulting NGO equipped with sophisticated analytical technologies and deep industry knowledge in the clean energy space.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 12 | Pearson Adair & COPartial evidence | 13 | |||
“Pearson Adair & Co, is an energy consulting practice founded on decades of industry experience.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 13 | 13 | ||||
“Bison Fuels develops hydrogen, advanced fuels, and distributed power infrastructure for industrial customers.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 14 | 13 | ||||
“APenergy (Air Power USA) is an independent and brand neutral consulting firm that has maintained that objectivity since our founding 35 years ago.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 15 | 11 | ||||
“FPoliSolutions specializes in the execution of complex analytical projects for industry segments that demands absolute reliability and safety.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 16 | 9 | ||||
“Greenway Energy is a group of dynamic and innovative consultants in the areas of hydrogen and methanol fuel cell technology and education.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 17 | Watson Millican & COIndirect evidence | 9 | |||
Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 18 | Element ONE EnergyPartial evidence | 6 | |||
“The Green Hydrogen Company Engineering | Manufacturing | Contracting” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 19 | Renewable Power AZIndirect evidence | 6 | |||
“Your Renewable Energy Consultants of Choice!” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 20 | Stancil & COIndirect evidence | 6 | |||
Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 21 | 6 | ||||
“EPC - Is the premier hydrogen infrastructure design, procurement, construction, and fabrication company leading the charge towards a sustainable hydrogen future.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 22 | 5 | ||||
“We are an engineering design firm serving the renewable energy, hydrogen and traditional oil & gas industries.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 23 | Kyle Groundwater, INCPartial evidence | 4 | |||
“KYLE Groundwater, Inc, was founded in response to demand for experienced and innovative hydrogeological solutions from our Southern California clients.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 24 | 3 | ||||
“Aion Energy LLC (Aion) provides strategic consulting services to the energy industry.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 25 | Main Line Energy Consultants, A Westwood TeamIndirect evidence | 3 | |||
“Main Line Energy Consultants LLC, a Westwood team (MLEC), has fully transitioned to Westwood after being acquired in 2019.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 128 hydrogen consulting firms based in the United States
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Hydrogen consulting firms based in the United States at a glance
As of Sep 3, 2026Companies by employee count
Verified emails by last verification
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 consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “hydrogen consulting firms”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among 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 an evidence 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, 336 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 3, 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
How many hydrogen consulting firms are there based in the United States?
RevenueBase identified 128 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?
Oneh2, INC, headquartered in Longview, tops this list with the largest team on record.
Which city has the most hydrogen consulting firms?
Houston leads with 14 headquartered companies, followed by New York (5) and Denver (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 336 verified decision-maker contacts tracked across these 128 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 3, 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 SmartSearch, 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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