Company lists · Data refreshed September 2026

Top 25 Decarbonization consultancies based in London, United Kingdom

Name: Decarbonization consultancies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 908 companies tracked

RevenueBase identified 908 decarbonization consultancies headquartered in London, United Kingdom as of September 2026 and tracks 37,384 professional contacts across them, including 16,400 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers decarbonization consultancies headquartered in London, 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 28, 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 28, 2026 86% judged on-target in blind review

908Companies

37,384Contacts tracked

16,400Verified emails

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The 25 largest decarbonization consultancies based in London, United Kingdom

Ranked by team size

Top 25 of 908 decarbonization consultancies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to decarbonization consultancies: 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	ERM	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	5,001-10,000	9,119 contacts →
	Indirect evidence “Sustainability is our business.” Source: RevenueBase Database · checked Sep 28, 2026
2	Veolia UK	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	2,823 contacts →
	Indirect evidence “Veolia UK provides solutions for ecological transformation which means reconciling human progress with environmental protection.” Source: RevenueBase Database · checked Sep 28, 2026
3	Shell Energy	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	2,627 contacts →
	Indirect evidence “We help businesses manage energy needs, boost efficiency, control costs and achieve decarbonisation goals for a better energy future.” Source: RevenueBase Database · checked Sep 28, 2026
4	Anthesis Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	894 contacts →
	Indirect evidence “Anthesis guides clients to sustainable performance.” Source: RevenueBase Database · checked Sep 28, 2026
5	CRU	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	713 contacts →
	Indirect evidence “CRU delivers independent, expert intelligence into the global commodities markets.” Source: RevenueBase Database · checked Sep 28, 2026
6	Ricardo PLC	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	670 contacts →
	Indirect evidence “Click the 'Follow' button and explore careers at Ricardo on our 'Jobs' and 'Life' tabs and at careers.ricardo.com.” Source: RevenueBase Database · checked Sep 28, 2026
7	E CO	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	621 contacts →
	Indirect evidence “For over 26 years, our consultants have been supporting and guiding our clients to achieve low-carbon climate-resilient development.” Source: RevenueBase Database · checked Sep 28, 2026
8	Energy Saving Trust	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	426 contacts →
	Indirect evidence “Energy Saving Trust is an independent organisation dedicated to promoting energy efficiency, low carbon transport and sustainable energy use.” Source: RevenueBase Database · checked Sep 28, 2026
9	Genesis	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	501-1,000	401 contacts →
	Indirect evidence “Genesis is a market-leading advisory company focused on providing high-value technical and advisory services for the energy industry.” Source: RevenueBase Database · checked Sep 28, 2026
10	The Carbon Trust	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	379 contacts →
	Indirect evidence “Our mission is to accelerate the move to a decarbonised future.” Source: RevenueBase Database · checked Sep 28, 2026
11	Ambipar Europe	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	335 contacts →
	Indirect evidence “At Ambipar, we are all caretakers of the planet!” Source: RevenueBase Database · checked Sep 28, 2026
12	Atelier TEN	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	323 contacts →
	Indirect evidence “As environmental design consultants, building services engineers and lighting designers, we are committed to high performance and sustainable design within the built environment.” Source: RevenueBase Database · checked Sep 28, 2026
13	Turner & Townsend Alinea	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	256 contacts →
	Indirect evidence “Turner and Townsend and alinea has joined forces to create a true data-led digital cost consultancy intent on becoming an authority on the economics of sustainability.” Source: RevenueBase Database · checked Sep 28, 2026
14	Bezero Carbon	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	192 contacts →
	Indirect evidence “Investing in carbon projects is essential to tackling climate change.” Source: RevenueBase Database · checked Sep 28, 2026
15	Carbon Clean	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	188 contacts →
	Indirect evidence “Carbon Clean is the point-source carbon capture expert, driving the decarbonisation of hard-to-abate industries for more than 15 years.” Source: RevenueBase Database · checked Sep 28, 2026
16	OWC	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	185 contacts →
	Indirect evidence “The Renewable Energy Consultants.” Source: RevenueBase Database · checked Sep 28, 2026
17	Brook Green Supply	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	183 contacts →
	Indirect evidence “As a trusted end-to-end partner in the energy space, Brook Green Supply delivers the insight and expertise our customers need to make informed decisions, transact energy with…” Source: RevenueBase Database · checked Sep 28, 2026
18	Wood Thilsted	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	175 contacts →
	Indirect evidence “Wood Thilsted is a world-leading renewable energy engineering consultancy experienced and specialised in offshore wind.” Source: RevenueBase Database · checked Sep 28, 2026
19	CFP Energy	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	171 contacts →
	Indirect evidence “CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Source: RevenueBase Database · checked Sep 28, 2026
20	ACRE	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	158 contacts →
	Indirect evidence “Acre is the global market leader for sustainability executive search and recruitment services, exclusively focused on integrating sustainability and catalysing positive change…” Source: RevenueBase Database · checked Sep 28, 2026
21	Evora Global	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	148 contacts →
	Indirect evidence “EVORA is an award-winning global sustainability consultancy and software provider supporting real asset investors, owners, and operators.” Source: RevenueBase Database · checked Sep 28, 2026
22	Pollination	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	139 contacts →
	Indirect evidence “Pollination is a specialist climate investment and advisory firm, dedicated to accelerating the transition to a net zero, nature positive and resilient future.” Source: RevenueBase Database · checked Sep 28, 2026
23	Bring Energy	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	125 contacts →
	Indirect evidence “We are Bring Energy.” Source: RevenueBase Database · checked Sep 28, 2026
24	ZTP	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	115 contacts →
	Indirect evidence “At ZTP, we’re committed to accelerating the transition to a more sustainable future by reducing the negative impact of human activity on our planet - ecologically, financially…” Source: RevenueBase Database · checked Sep 28, 2026
25	Longevity Partners	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	115 contacts →
	Indirect evidence “Longevity Partners is a multidisciplinary energy and sustainability consultancy.” Source: RevenueBase Database · checked Sep 28, 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: decarbonization consultancies. 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 decarbonization consultancies.
Partial evidence: Its own public description names part of decarbonization consultancies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name decarbonization consultancies. 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 908 decarbonization consultancies based in London, United Kingdom

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Decarbonization consultancies based in London, United Kingdom at a glance

As of Sep 28, 2026

43.9%Verified-email coverage

41.2Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

587

11-50

228

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 908 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 decarbonization consultancies, 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 London, United Kingdom whose own description of what they do matches “decarbonization consultancies”. 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 decarbonization consultancies), 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 decarbonization consultancies, and records with no verified work email. Companies headquartered outside London 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, 16,400 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 28, 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.

Decarbonization consultancies by metro in the United Kingdom

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 decarbonization consultancies, 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 decarbonization consultancies are there based in London, United Kingdom?

RevenueBase identified 908 decarbonization consultancies headquartered in London, 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?

ERM, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most decarbonization consultancies?

London leads the United Kingdom with 908 headquartered companies, followed by Manchester (72) and Edinburgh (53).

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 16,400 verified decision-maker contacts tracked across these 908 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 28, 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.