Company lists · Data refreshed September 2026

Top 23 Energy efficiency consulting firms based in London, United Kingdom

Name: Energy efficiency consulting firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 12, 2026 131 companies tracked

RevenueBase identified 131 energy efficiency consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 1,688 professional contacts across them, including 808 with verified work emails and 118 with mobile numbers. London is the largest hub.

This list covers energy efficiency consulting firms 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 12, 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 12, 2026 86% judged on-target in blind review

131Companies

1,688Contacts tracked

808Verified emails

118Mobile numbers

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The 23 largest energy efficiency consulting firms based in London, United Kingdom

Ranked by team size

Top 23 of 131 energy efficiency consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 12, 2026. RevenueBase Smart Search rates how each company's information relates to energy efficiency 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	Atelier TEN	Indirect evidence	London, United KingdomHQ checked Sep 12, 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 12, 2026
2	CFP Energy	Partial evidence	London, United KingdomHQ checked Sep 12, 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 12, 2026
3	Mitie Energy	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	125 contacts →
	Partial evidence “Mitie Energy are an award-winning, UK-based energy, utilities and sustainability solutions business.” Source: RevenueBase Database · checked Sep 12, 2026
4	ZTP	Indirect evidence	London, United KingdomHQ checked Sep 12, 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 12, 2026
5	Longevity Partners	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	115 contacts →
	Partial evidence “Longevity Partners is a multidisciplinary energy and sustainability consultancy.” Source: RevenueBase Database · checked Sep 12, 2026
6	Sustainable Advantage	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	89 contacts →
	Indirect evidence “Sustainable Advantage partners with Private Equity funds and businesses across the UK, France, and wider Europe.” Source: RevenueBase Database · checked Sep 12, 2026
7	Alfa Energy An Edison Energy Company	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	201-500	88 contacts →
	Partial 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 12, 2026
8	Energy Drive	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	60 contacts →
	Strong evidence “We help heavy industry like steel become more energy efficient through the deployment of intelligent MV motor control via a zero-capex model: guaranteed net savings for the…” Source: RevenueBase Database · checked Sep 12, 2026
9	Advantage Utilities LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 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 12, 2026
10	Envision	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	34 contacts →
	Partial 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 12, 2026
11	Mees Solutions	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	12 contacts →
	Partial evidence “INNOVATIVE & COMPREHENSIVE MEES SOLUTIONS MEES Solutions was founded by three industry experts to provide specialist advice and modelling for all aspects of the Minimum Energy…” Source: RevenueBase Database · checked Sep 12, 2026
12	Future Energy Partners	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	12 contacts →
	Partial evidence “ENERGY TRANSITION We provide clean energy options and practical solutions for our clients, and pride ourselves in being a consultancy that is dedicated to delivering today’s…” Source: RevenueBase Database · checked Sep 12, 2026
13	BTP Consultants	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	12 contacts →
	Partial evidence “We design mechanical and electrical systems, advise on all aspects of energy, carbon reduction and building physics.” Source: RevenueBase Database · checked Sep 12, 2026
14	Flow&ebb LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	11 contacts →
	Partial evidence “We often talk to people in large businesses who are not getting the support they need to manage their energy costs well.” Source: RevenueBase Database · checked Sep 12, 2026
15	Zerogram	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	10 contacts →
	Indirect evidence “Zerogram is on a mission to make net zero not just possible, but practical.” Source: RevenueBase Database · checked Sep 12, 2026
16	Twenty ONE Engineering	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	10 contacts →
	Partial evidence “We offer a world leading Energy and Engineering support to our clients.” Source: RevenueBase Database · checked Sep 12, 2026
17	Forstå Projects LTD	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	8 contacts →
	Indirect evidence “Welcome to our world of green certifications!” Source: RevenueBase Database · checked Sep 12, 2026
18	Kuungana Advisory	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	7 contacts →
	Strong evidence “Kuungana Advisory is a consulting firm providing energy economics and commercial advisory services to public sector and private sector actors in the energy sector.” Source: RevenueBase Database · checked Sep 12, 2026
19	A Plus Consulting LTD	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	7 contacts →
	Strong evidence “A Plus Consulting are a multidisciplinary group of consultants with backgrounds in engineering services design, energy and building physics.” Source: RevenueBase Database · checked Sep 12, 2026
20	Light UP Energy	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	7 contacts →
	Partial evidence “At Light Up Energy, we are dedicated to revolutionizing the energy landscape for the hospitality sector, aiming to make a tangible and positive impact.” Source: RevenueBase Database · checked Sep 12, 2026
21	Smart Green Shift LTD Shift	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	7 contacts →
	Strong evidence “We (Smart Green Shift Ltd) are a consulting firm that provides a wide range of services in net-zero carbon building design and Excellence in Design for Greater Efficiencies (EDGE)…” Source: RevenueBase Database · checked Sep 12, 2026
22	P3r Engineers LTD	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	6 contacts →
	Partial evidence “P3r Engineers offer innovative design in building services and are energy and sustainability consultants.” Source: RevenueBase Database · checked Sep 12, 2026
23	Quimera Energy Efficiency	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	6 contacts →
	Strong evidence “Quimera Energy Efficiency (QEE) develops energy efficiency projects focused on creating energy savings and reducing operational costs, using the latest sustainable technologies.” Source: RevenueBase Database · checked Sep 12, 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: energy efficiency 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 energy efficiency consulting firms.
Partial evidence: Its own public description names part of energy efficiency consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy efficiency 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 23 of 131 energy efficiency consulting firms based in London, United Kingdom

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Energy efficiency consulting firms based in London, United Kingdom at a glance

As of Sep 12, 2026

47.9%Verified-email coverage

7.0%Mobile-number coverage

12.9Average contacts per company

1-10Median size (employees)

103.1%Largest-city concentration · London

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 14.0d

6860–30

11231–60

661–90

090–180

4180+

Company record updated

Median 64.0d

00–30

70931–60

68261–90

18890–180

109180+

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 energy efficiency 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.
What qualifies: Companies headquartered in London, United Kingdom whose own description of what they do matches “energy efficiency 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 energy efficiency 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 energy efficiency consulting firms, 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, 808 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 12, 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.

Energy efficiency consulting firms by metro in the United Kingdom

Energy efficiency consulting firms in London135
Energy efficiency consulting firms in Manchester26

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 energy efficiency 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 energy efficiency consulting firms are there based in London, United Kingdom?

RevenueBase identified 131 energy efficiency consulting firms 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?

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

Which city has the most energy efficiency consulting firms?

London leads with 135 headquartered companies, followed by Manchester (26) and Nottingham (17).

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 808 verified decision-maker contacts tracked across these 131 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 12, 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.