Company lists · Data refreshed September 2026

Top 25 Sustainable fuels consulting firms worldwide

Name: Sustainable fuels consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 5,922 companies tracked

RevenueBase identified 5,922 sustainable fuels consulting firms worldwide as of September 2026 and tracks 50,338 professional contacts across them, including 14,918 with verified work emails. The United States is the largest market and London the largest hub.

This list covers sustainable fuels consulting firms 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 29, 2026. Country and city lists for sustainable fuels consulting firms 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 29, 2026 86% judged on-target in blind review

5,922Companies

50,338Contacts tracked

14,918Verified emails

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The 25 largest sustainable fuels consulting firms worldwide

Ranked by team size

Top 25 of 5,922 sustainable fuels consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable fuels 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	OLA	Strong evidence	Austin, TX, United StatesHQ checked Sep 29, 2026	n/a	1,145 contacts →
	Strong evidence “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Source: RevenueBase Database · checked Sep 29, 2026
2	Penspen	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	1,001-5,000	1,007 contacts →
	Partial evidence “Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Source: RevenueBase Database · checked Sep 29, 2026
3	Integral S.A. Ingenieros Consultores	Indirect evidence	Medellín \| Bogotá \| Lima \| Miami \| Nueva Delhi, ColombiaHQ checked Sep 29, 2026	1,001-5,000	709 contacts →
	Indirect evidence “Over six decades offering our consultancy services locally and internationally, based on ethical principles and commitments, always through honest, socially responsible actions…” Source: RevenueBase Database · checked Sep 29, 2026
4	Inerco	Partial evidence	Sevilla, SpainHQ checked Sep 29, 2026	1,001-5,000	688 contacts →
	Partial evidence “INERCO, with 30 years of experience, offers comprehensive services and develops advanced technologies that contribute to sustainable industrial development, acting as a leader in…” Source: RevenueBase Database · checked Sep 29, 2026
5	Revergy	Indirect evidence	Seville, SpainHQ checked Sep 29, 2026	501-1,000	502 contacts →
	Indirect evidence “REVERGY nace mediante un proyecto de profesionales procedentes de diferentes ámbitos del sector de las energías renovables con el fin de presentar un proyecto marcado por la…” Source: RevenueBase Database · checked Sep 29, 2026
6	Natural Power	Indirect evidence	Castle Douglas, United KingdomHQ checked Sep 29, 2026	501-1,000	500 contacts →
	Indirect evidence “Natural Power is a leading independent consultancy and service provider for the renewable energy sector.” Source: RevenueBase Database · checked Sep 29, 2026
7	Fichtner Consulting Engineers LTD	Indirect evidence	Stockport, United KingdomHQ checked Sep 29, 2026	51-200	418 contacts →
	Indirect evidence “Fichtner is one of the world's leading independent engineering consultancy firms.” Source: RevenueBase Database · checked Sep 29, 2026
8	Greenflex	Indirect evidence	Paris, FranceHQ checked Sep 29, 2026	501-1,000	390 contacts →
	Indirect evidence “Since 2009, GreenFlex has been a key partner in the energy, environmental and societal transformation of organizations, enabling them to change their trajectory towards an economy…” Source: RevenueBase Database · checked Sep 29, 2026
9	TRIO	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 29, 2026	201-500	383 contacts →
	Indirect evidence “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Source: RevenueBase Database · checked Sep 29, 2026
10	Doris Group	Indirect evidence	Paris, FranceHQ checked Sep 29, 2026	501-1,000	365 contacts →
	Indirect evidence “DORIS is a leader in the provision of engineering, advisory, and project management services to the energy industry.” Source: RevenueBase Database · checked Sep 29, 2026
11	EMM Consulting PTY Limited	Partial evidence	St Leonards, AustraliaHQ checked Sep 29, 2026	201-500	361 contacts →
	Partial evidence “At EMM, we believe that a sustainable future is achievable, and we are dedicated to helping our clients and the community make it a reality.” Source: RevenueBase Database · checked Sep 29, 2026
12	Triton Environmental Consultants LTD	Indirect evidence	Vancouver, BC, CanadaHQ checked Sep 29, 2026	201-500	351 contacts →
	Indirect evidence “Triton Environmental Consultants knows western Canada.” Source: RevenueBase Database · checked Sep 29, 2026
13	AESA	Indirect evidence	Barcelona, SpainHQ checked Sep 29, 2026	n/a	351 contacts →
	Indirect evidence “Ingeniería y Consultoría Energética orientada a la búsqueda y el desarrollo de soluciones energéticas de alta eficiencia para sus Clientes.” Source: RevenueBase Database · checked Sep 29, 2026
14	U.S. Energy	Indirect evidence	Appleton, WI, United StatesHQ checked Sep 29, 2026	1,001-5,000	324 contacts →
	Indirect evidence “U.S.” Source: RevenueBase Database · checked Sep 29, 2026
15	ETP CC	Partial evidence	AustraliaHQ checked Sep 29, 2026	n/a	320 contacts →
	Partial evidence “Management Consulting in the Energy Sector” Source: RevenueBase Database · checked Sep 29, 2026
16	EIC Partnership	Partial evidence	Redditch, United KingdomHQ checked Sep 29, 2026	51-200	316 contacts →
	Partial evidence “EIC Partnership: A Legacy of Expertise, A Commitment to Sustainability With origins dating back to 1975, EIC has cultivated nearly 50 years of distinguished service in energy and…” Source: RevenueBase Database · checked Sep 29, 2026
17	Environmental Consulting & Technology, Inc. ECT	Strong evidence	Gainesville, FL, United StatesHQ checked Sep 29, 2026	201-500	305 contacts →
	Strong evidence “Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…” Source: RevenueBase Database · checked Sep 29, 2026
18	Sólida	Partial evidence	Madrid, SpainHQ checked Sep 29, 2026	201-500	298 contacts →
	Partial evidence “SÓLIDA, a Bureau Veritas Company, is an independent company founded in 2007 that provides high added-value engineering and consulting services within the renewable energy sector.” Source: RevenueBase Database · checked Sep 29, 2026
19	Lake Superior Consulting	Indirect evidence	Duluth, MN, United StatesHQ checked Sep 29, 2026	201-500	281 contacts →
	Indirect evidence “We act as an extension of your team, combining deep energy expertise with seamless alignment to your processes to advance projects with confidence.” Source: RevenueBase Database · checked Sep 29, 2026
20	Eodd Ingénieurs Conseils	Indirect evidence	Villeurbanne, FranceHQ checked Sep 29, 2026	201-500	278 contacts →
	Indirect evidence “Créé en 1991, reconnu comme l’un des meilleurs cabinets français spécialiste de la transformation écologique, EODD ingénieurs conseils apporte sa vision transversale et ses…” Source: RevenueBase Database · checked Sep 29, 2026
21	Illumine-I	Indirect evidence	Austin, CA, United StatesHQ checked Sep 29, 2026	201-500	275 contacts →
	Indirect evidence “The world runs on power.” Source: RevenueBase Database · checked Sep 29, 2026
22	Merjent	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 29, 2026	201-500	264 contacts →
	Partial evidence “Merjent is an environmental, restoration, and engineering consulting firm with a long history serving the energy industry.” Source: RevenueBase Database · checked Sep 29, 2026
23	PSC Consulting	Partial evidence	Kirkland, WA, United StatesHQ checked Sep 29, 2026	201-500	254 contacts →
	Partial evidence “We provide global renewable energy consulting services, focused on empowering clients to navigate the complexities of the energy transition.” Source: RevenueBase Database · checked Sep 29, 2026
24	Valora Consultores	Partial evidence	Madrid, United KingdomHQ checked Sep 29, 2026	51-200	241 contacts →
	Partial evidence “VALORA is a consulting company who focus its activity towards a new professional innovative and thrilling challenge.” Source: RevenueBase Database · checked Sep 29, 2026
25	Ecointegral Ingeniería, SL	Partial evidence	Córdoba, SpainHQ checked Sep 29, 2026	201-500	234 contacts →
	Partial evidence “ECOINTEGRAL INGENIERÍA is an independent company of advanced engineering and consulting firm that operates in 3 areas of expertise: Energy, Telecommunications and Environment.” Source: RevenueBase Database · checked Sep 29, 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 fuels 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 fuels consulting firms.
Partial evidence: Its own public description names part of sustainable fuels 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 fuels 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 5,922 sustainable fuels consulting firms worldwide

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Sustainable fuels consulting firms worldwide at a glance

As of Sep 29, 2026

29.6%Verified-email coverage

8.5Average contacts per company

1-10Median size (employees)

1.6%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

4,037

11-50

1,480

51-200

280

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 sustainable fuels 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.
Coverage: Every country. Country and city lists for sustainable fuels consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “sustainable fuels 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 fuels 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 fuels consulting firms, 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, 14,918 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 29, 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 fuels consulting firms by location

36 lists · largest first

Every Sustainable fuels consulting firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 fuels 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 fuels consulting firms are there worldwide?

RevenueBase identified 5,922 sustainable fuels consulting firms 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?

OLA, headquartered in Austin, tops this list with the largest team on record.

Which country has the most sustainable fuels consulting firms?

The United States leads with 638 companies, followed by Brazil (408) and the United Kingdom (331). Every sustainable fuels consulting firms list by country and city is linked on this page.

Which city has the most sustainable fuels consulting firms?

London leads with 96 headquartered companies, followed by Madrid (65) and Houston (56).

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 14,918 verified decision-maker contacts tracked across these 5,922 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 29, 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.