Company lists · Data refreshed October 2026

Top 25 Clean energy transition advisors based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Oct 9, 2026 308 companies tracked

RevenueBase identified 308 company matches for clean energy transition advisors associated with London, United Kingdom as of October 2026 and tracks 18,218 professional contacts across them, including 9,107 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for clean energy transition advisors associated with London, United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 9, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Oct 9, 2026 How this list was built

308Companies

18,218Contacts tracked

9,107Verified emails

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The 25 largest clean energy transition advisors based in London, United Kingdom

Ranked by team size

Top 25 of 308 company matches for clean energy transition advisors based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 9, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	ERM	Exact match	London, United KingdomHQ recorded Oct 9, 2026	5,001-10,000	9,532 contacts →
	Exact match “Sustainability is our business.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
2	SLR Consulting	Exact match	London, United KingdomHQ recorded Oct 9, 2026	1,001-5,000	4,083 contacts →
	Exact match “SLR is a committed partner in our clients’ sustainability journeys.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
3	Anthesis Group	Exact match	London, United KingdomHQ recorded Oct 9, 2026	1,001-5,000	927 contacts →
	Exact match “Anthesis guides clients to sustainable performance.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
4	E CO	Exact match	London, United KingdomHQ recorded Oct 9, 2026	n/a	639 contacts →
	Exact match “For over 26 years, our consultants have been supporting and guiding our clients to achieve low-carbon climate-resilient development.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
5	Energy Saving Trust	Exact match	London, United KingdomHQ recorded Oct 9, 2026	201-500	440 contacts →
	Exact match “Energy Saving Trust is an independent organisation dedicated to promoting energy efficiency, low carbon transport and sustainable energy use.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
6	CFP Energy	Exact match	London, United KingdomHQ recorded Oct 9, 2026	201-500	173 contacts →
	Exact match “CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
7	ZTP	Exact match	London, United KingdomHQ recorded Oct 9, 2026	51-200	128 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
8	Longevity Partners	Exact match	London, United KingdomHQ recorded Oct 9, 2026	51-200	128 contacts →
	Exact match “Longevity Partners is a multidisciplinary energy and sustainability consultancy.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
9	EMBER	Exact match	London, United KingdomHQ recorded Oct 9, 2026	51-200	90 contacts →
	Exact match “Global energy think tank accelerating the clean energy transition with data and policy” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
10	Sustainable Advantage	Exact match	London, United KingdomHQ recorded Oct 9, 2026	51-200	86 contacts →
	Exact match “Sustainable Advantage partners with Private Equity funds and businesses across the UK, France, and wider Europe.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
11	Alfa Energy An Edison Energy Company	Exact match	London, United KingdomHQ recorded Oct 9, 2026	201-500	83 contacts →
	Exact match “Alfa Energy Group (an Edison Energy company) is an international energy, sustainability and technology consultant partner with 200 employees over four international locations.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
12	Xynteo	Exact match	London, United KingdomHQ recorded Oct 9, 2026	51-200	65 contacts →
	Exact match “Xynteo is a boutique advisory firm, based in Europe and India, on a mission to help global organisations and investors accelerate sustainable impact and value creation.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
13	Action Sustainability	Exact match	London, United KingdomHQ recorded Oct 9, 2026	51-200	62 contacts →
	Exact match “Recognised for its commitment to employees with a sought-after Best Companies “One To Watch” industry standard, Action Sustainability offers a 3-in-1 solution through…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
14	Augusta & CO	Exact match	London, United KingdomHQ recorded Oct 9, 2026	11-50	51 contacts →
	Exact match “Augusta is a London-based specialist financial advisory firm serving the renewables and energy transition sector.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
15	Engage Consulting	Exact match	London, United KingdomHQ recorded Oct 9, 2026	11-50	51 contacts →
	Exact match “Energy Industry Experts We are subject matter experts in the energy sector.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
16	Bioregional	Exact match	London, United KingdomHQ recorded Oct 9, 2026	11-50	49 contacts →
	Exact match “We’re agile sustainability experts who break daunting challenges into achievable, collaborative steps.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
17	Ecoact Part Of Schneider Electric	Exact match	London, United KingdomHQ recorded Oct 9, 2026	201-500	49 contacts →
	Exact match “EcoAct is now SE Advisory Services.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
18	AVA Energy	Exact match	London, United KingdomHQ recorded Oct 9, 2026	11-50	47 contacts →
	Exact match “AVA Energy – Powering Energy Talent.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
19	Amberside Advisors	Exact match	London, United KingdomHQ recorded Oct 9, 2026	11-50	43 contacts →
	Exact match “Amberside Advisors is an independent consultancy providing financial and commercial advice to low carbon energy, infrastructure and public sector projects.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
20	Eight Versa	Exact match	London, United KingdomHQ recorded Oct 9, 2026	51-200	40 contacts →
	Exact match “At Eight Versa, we deliver a new direction for a balanced future.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
21	Mitie Plan Zero	Exact match	London, United KingdomHQ recorded Oct 9, 2026	n/a	33 contacts →
	Exact match “Mitie’s knowledge of customer estates, combined with our ability to execute a zero carbon strategy from assessment through to delivery is, we believe, unrivalled.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
22	Akereos Capital	Exact match	London, United KingdomHQ recorded Oct 9, 2026	11-50	33 contacts →
	Exact match “AKEREOS CAPITAL Akereos is an investment banking firm solely focused on the Energy Transition.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
23	Envision	Exact match	London, United KingdomHQ recorded Oct 9, 2026	11-50	33 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
24	Syzygy	Exact match	London, United KingdomHQ recorded Oct 9, 2026	11-50	33 contacts →
	Exact match “Founded in 2010, Syzygy is the leading specialist low carbon technology consultancy for the real estate sector.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase
25	Etasca	Exact match	London, United KingdomHQ recorded Oct 9, 2026	11-50	32 contacts →
	Exact match “The energy transition is gaining momentum but needs to accelerate to meet the challenges posed by the climate emergency.” Recorded in the RevenueBase company graph · Oct 9, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “clean energy transition advisors”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 308 clean energy transition advisors based in London, United Kingdom

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Clean energy transition advisors based in London, United Kingdom at a glance

As of Oct 9, 2026

50.0%Verified-email coverage

59.1Average contacts per company

1-10Median size (employees)

Oct 9, 2026Page data refreshed

Companies by employee count

1-10

204

11-50

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 308 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with London, United Kingdom whose business descriptions match “clean energy transition advisors” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 9,107 professional contacts with verified work emails across the full matched dataset. 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 October 9, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “clean energy transition advisors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many clean energy transition advisors are there based in London, United Kingdom?

RevenueBase identified 308 company matches for clean energy transition advisors associated with London, United Kingdom as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

ERM tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United Kingdom has the most clean energy transition advisors?

London leads the United Kingdom with 308 company records, followed by Bristol (20) and Manchester (17).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 9,107 professional contacts with verified work emails tracked across these 308 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 9, 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.