Company lists · Data refreshed September 2026

Top 25 Sustainable energy consultants based in London, United Kingdom

Name: Sustainable energy consultants based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 18, 2026 358 companies tracked

RevenueBase identified 358 sustainable energy consultants headquartered in London, United Kingdom as of September 2026 and tracks 15,041 professional contacts across them, including 7,101 with verified work emails. London is the largest hub.

This list covers sustainable energy consultants 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 18, 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 18, 2026 86% judged on-target in blind review

358Companies

15,041Contacts tracked

7,101Verified emails

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The 25 largest sustainable energy consultants based in London, United Kingdom

Ranked by team size

Top 25 of 358 sustainable energy consultants based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 18, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable energy consultants: 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	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	5,001-10,000	9,119 contacts →
	Partial evidence “Sustainability is our business.” Source: RevenueBase Database · checked Sep 18, 2026
2	Penspen	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	1,001-5,000	1,007 contacts →
	Strong evidence “Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Source: RevenueBase Database · checked Sep 18, 2026
3	Reon Energy Limited	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	402 contacts →
	Partial evidence “Reon Energy is a leading Cleantech company deploying Intelligent Renewable Energy Microgrids across South Asia, GCC & African region.” Source: RevenueBase Database · checked Sep 18, 2026
4	Genesis	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	501-1,000	401 contacts →
	Partial 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 18, 2026
5	Atelier TEN	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	323 contacts →
	Strong 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 18, 2026
6	Intec Energy Solutions	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	501-1,000	242 contacts →
	Partial evidence “INTEC Energy Solutions delivers best-in-class services in Engineering, Procurement, Construction (EPC), Battery Energy Storage Systems (BESS), Manufacturing, Project Development…” Source: RevenueBase Database · checked Sep 18, 2026
7	OWC	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	185 contacts →
	Strong evidence “The Renewable Energy Consultants.” Source: RevenueBase Database · checked Sep 18, 2026
8	Wood Thilsted	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	175 contacts →
	Strong evidence “Wood Thilsted is a world-leading renewable energy engineering consultancy experienced and specialised in offshore wind.” Source: RevenueBase Database · checked Sep 18, 2026
9	CFP Energy	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	171 contacts →
	Partial evidence “CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Source: RevenueBase Database · checked Sep 18, 2026
10	JD Ross Energy	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	143 contacts →
	Strong evidence “JD Ross Energy is an international talent consultancy that solely focuses on the Renewable Energy sector, connecting the best talent across the globe with companies that are…” Source: RevenueBase Database · checked Sep 18, 2026
11	Mitie Energy	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	125 contacts →
	Strong evidence “Mitie Energy are an award-winning, UK-based energy, utilities and sustainability solutions business.” Source: RevenueBase Database · checked Sep 18, 2026
12	ZTP	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	115 contacts →
	Partial 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 18, 2026
13	Longevity Partners	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	115 contacts →
	Strong evidence “Longevity Partners is a multidisciplinary energy and sustainability consultancy.” Source: RevenueBase Database · checked Sep 18, 2026
14	Greengage Environmental LTD	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	93 contacts →
	Strong evidence “Greengage is an independent sustainability and environmental consultancy known for providing bespoke advice and working in partnership with our clients and multi-disciplinary…” Source: RevenueBase Database · checked Sep 18, 2026
15	Sustainable Advantage	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	89 contacts →
	Partial evidence “Sustainable Advantage partners with Private Equity funds and businesses across the UK, France, and wider Europe.” Source: RevenueBase Database · checked Sep 18, 2026
16	Alfa Energy An Edison Energy Company	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	88 contacts →
	Strong evidence “Alfa Energy Group (an Edison Energy company) is an international energy, sustainability and technology consultant partner with 200 employees over four international locations.” Source: RevenueBase Database · checked Sep 18, 2026
17	Advantage Utilities LTD	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	11-50	50 contacts →
	Partial evidence “Advantage Utilities mission is to provide customers with a “One-Stop-Shop” for all their energy needs – with Market Leading Data/Expertise and Unrivalled “Drop Everything”…” Source: RevenueBase Database · checked Sep 18, 2026
18	Engage Consulting	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	11-50	48 contacts →
	Partial evidence “Energy Industry Experts We are subject matter experts in the energy sector.” Source: RevenueBase Database · checked Sep 18, 2026
19	AVA Energy	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	11-50	47 contacts →
	Partial evidence “AVA Energy – Powering Energy Talent.” Source: RevenueBase Database · checked Sep 18, 2026
20	ETUDE	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	11-50	47 contacts →
	Partial evidence “We are a team of sustainability engineers passionate about creating buildings with a positive impact on the environment and the community.” Source: RevenueBase Database · checked Sep 18, 2026
21	GAS Strategies	Indirect evidence	London, United KingdomHQ checked Sep 18, 2026	11-50	45 contacts →
	Indirect evidence “In a world where speed is a competitive advantage, Gas Strategies accelerates your route to readiness.” Source: RevenueBase Database · checked Sep 18, 2026
22	Amberside Advisors	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	11-50	44 contacts →
	Strong evidence “Amberside Advisors is an independent consultancy providing financial and commercial advice to low carbon energy, infrastructure and public sector projects.” Source: RevenueBase Database · checked Sep 18, 2026
23	Eight Versa	Indirect evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	42 contacts →
	Indirect evidence “At Eight Versa, we deliver a new direction for a balanced future.” Source: RevenueBase Database · checked Sep 18, 2026
24	Syzygy	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	11-50	35 contacts →
	Partial evidence “Founded in 2010, Syzygy is the leading specialist low carbon technology consultancy for the real estate sector.” Source: RevenueBase Database · checked Sep 18, 2026
25	Envision	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	11-50	34 contacts →
	Strong evidence “Envision is a specialist sustainability, energy and net zero design consultancy offering strategic and technical advice within the built environment and to businesses wishing to…” Source: RevenueBase Database · checked Sep 18, 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 energy consultants. 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 energy consultants.
Partial evidence: Its own public description names part of sustainable energy consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable energy consultants. 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 358 sustainable energy consultants based in London, United Kingdom

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Sustainable energy consultants based in London, United Kingdom at a glance

As of Sep 18, 2026

47.2%Verified-email coverage

42.0Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 18, 2026Page data refreshed

Companies by employee count

1-10

218

11-50

104

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 358 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 sustainable energy consultants, 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 “sustainable energy consultants”. 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 energy consultants), 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 energy consultants, 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, 7,101 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 18, 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 energy consultants by metro in the United Kingdom

Sustainable energy consultants in London358
Sustainable energy consultants in Manchester48
Sustainable energy consultants in Bristol31
Sustainable energy consultants in Edinburgh30
Sustainable energy consultants in Glasgow30

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 energy consultants, 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 energy consultants are there based in London, United Kingdom?

RevenueBase identified 358 sustainable energy consultants 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 has the most sustainable energy consultants?

London leads with 358 headquartered companies, followed by Manchester (48) and Bristol (31).

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 7,101 verified decision-maker contacts tracked across these 358 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 18, 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.