Company lists · Data refreshed September 2026

Top 25 Energy efficiency consulting firms based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 2, 2026 864 companies tracked

RevenueBase identified 864 energy efficiency consulting firms headquartered in the United Kingdom as of September 2026 and tracks 16,836 professional contacts across them, including 6,063 with verified work emails and 749 with mobile numbers. London is the largest hub.

This list covers energy efficiency consulting firms headquartered in the 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 2, 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 RevenueBase Smart Search rating on every row Refreshed Sep 2, 2026 86% judged on-target in blind review

864Companies

16,836Contacts tracked

6,063Verified emails

749Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest energy efficiency consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 864 energy efficiency consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 2, 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	British GAS	Indirect evidence	Staines, United Kingdom	10001+	9,287 contacts →
	Indirect evidence “Taking care of things.” Source: RevenueBase Database · checked Sep 2, 2026
2	Atelier TEN	Indirect evidence	London, United Kingdom	51-200	321 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 2, 2026
3	EIC Partnership	Partial evidence	Redditch, United Kingdom	51-200	315 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 2, 2026
4	CFP Energy	Partial evidence	London, United Kingdom	201-500	177 contacts →
	Partial evidence “CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Source: RevenueBase Database · checked Sep 2, 2026
5	Consultiv Utilities	Strong evidence	Hebburn, United Kingdom	201-500	156 contacts →
	Strong evidence “At Consultiv Utilities we are leading the way with human-guided, tech-empowered energy and utility solutions for businesses of all sizes.” Source: RevenueBase Database · checked Sep 2, 2026
6	Optimised	Partial evidence	Bristol, United Kingdom	51-200	139 contacts →
	Partial evidence “Optimised exists to accelerate the shift to a low-carbon future by making energy management work; commercially, operationally and sustainably.” Source: RevenueBase Database · checked Sep 2, 2026
7	Consultus	Strong evidence	Rochford, United Kingdom	51-200	127 contacts →
	Strong evidence “Recognised as the Consultancy of the Year in 2021 by Energy Live News, Consultus delivers world-class consulting, buying and management services for Business Energy and Business…” Source: RevenueBase Database · checked Sep 2, 2026
8	Mitie Energy	Partial evidence	London, United Kingdom	51-200	126 contacts →
	Partial evidence “Mitie Energy are an award-winning, UK-based energy, utilities and sustainability solutions business.” Source: RevenueBase Database · checked Sep 2, 2026
9	AMBER	Partial evidence	Cardiff, United Kingdom	51-200	123 contacts →
	Partial evidence “We are an award-winning energy consultancy and certified B Corp™.” Source: RevenueBase Database · checked Sep 2, 2026
10	Tritility	Partial evidence	Jarrow, United Kingdom	51-200	122 contacts →
	Partial evidence “Tritility is a UK business energy consultancy helping organisations reduce energy and overhead costs through smarter electricity, gas and water procurement.” Source: RevenueBase Database · checked Sep 2, 2026
11	ZTP	Indirect evidence	London, United Kingdom	51-200	116 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 2, 2026
12	TROO	Partial evidence	United Kingdom	51-200	104 contacts →
	Partial evidence “Managing business energy can be overwhelming.” Source: RevenueBase Database · checked Sep 2, 2026
13	The Green Energy Advice Bureau	Partial evidence	Sunderland, United Kingdom	51-200	98 contacts →
	Partial evidence “The Green Energy Advice Bureau are a leading independent award-winning UK commercial energy consultancy.” Source: RevenueBase Database · checked Sep 2, 2026
14	Katoni Engineering	Strong evidence	Aberdeen, United Kingdom	51-200	90 contacts →
	Strong evidence “Katoni provides consulting, engineering, optimisation and emissions reduction support for the Energy Sector.” Source: RevenueBase Database · checked Sep 2, 2026
15	Sustainable Advantage	Indirect evidence	London, United Kingdom	51-200	88 contacts →
	Indirect evidence “Sustainable Advantage partners with Private Equity funds and businesses across the UK, France, and wider Europe.” Source: RevenueBase Database · checked Sep 2, 2026
16	Team Energy Auditing Agency LTD	Strong evidence	Milton Keynes, United Kingdom	51-200	70 contacts →
	Strong evidence “TEAM is the UK’s leading supplier of carbon and energy management solutions committed to driving the efficiency and sustainability of energy consumption and environmental…” Source: RevenueBase Database · checked Sep 2, 2026
17	Birdsall Group LTD	Strong evidence	East Grinstead, United Kingdom	51-200	64 contacts →
	Strong evidence “Our History Birdsall are an innovative company with a 48-year track record of delivering energy efficiency and environmental solutions to our clients.” Source: RevenueBase Database · checked Sep 2, 2026
18	Cenergist	Strong evidence	Washington, United Kingdom	201-500	63 contacts →
	Strong evidence “Cenergist is a specialist energy and water efficiency company in the UK and Europe.” Source: RevenueBase Database · checked Sep 2, 2026
19	RYBKA	Partial evidence	Edinburgh, United Kingdom	51-200	61 contacts →
	Partial evidence “Rybka is a leading Building Services Engineering, Low Carbon and Sustainability Consultancy with a wide geographical spread and a focus on providing commercially viable, energy…” Source: RevenueBase Database · checked Sep 2, 2026
20	RSP Consulting Engineers	Strong evidence	Aberdeen, United Kingdom	51-200	60 contacts →
	Strong evidence “RSP Consulting Engineers LLP are leaders in sustainable and low energy building services design.” Source: RevenueBase Database · checked Sep 2, 2026
21	Energy Drive	Strong evidence	London, United Kingdom	51-200	59 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 2, 2026
22	Method Consulting	Partial evidence	Cardiff, United Kingdom	51-200	53 contacts →
	Partial evidence “At Method Consulting, we are specialists in engineering and sustainability solutions, focusing on building services and sustainability for the built environment.” Source: RevenueBase Database · checked Sep 2, 2026
23	Fusion For Business	Indirect evidence	Durham, United Kingdom	51-200	49 contacts →
	Indirect evidence “At Fusion For Business, we believe in the value of genuine human connection - people doing business with people they trust.” Source: RevenueBase Database · checked Sep 2, 2026
24	ECBS	Indirect evidence	Hebburn, United Kingdom	51-200	47 contacts →
	Indirect evidence “At ECBS we specialise in working with customers to significantly reduce their business utility costs and make the necessary steps towards a greener future.” Source: RevenueBase Database · checked Sep 2, 2026
25	Pace Global, A Siemens Business	Strong evidence	Camberley, United Kingdom	51-200	38 contacts →
	Strong evidence “Pace Global, a Siemens business, is a leading energy consulting and management company.” Source: RevenueBase Database · checked Sep 2, 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 25 of 864 energy efficiency consulting firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 6,063 reachable decision-makers.

Free signup · no credit card

View the full list →

Energy efficiency consulting firms based in the United Kingdom at a glance

As of Sep 2, 2026

36.0%Verified-email coverage

4.4%Mobile-number coverage

19.5Average contacts per company

1-10Median size (employees)

15.6%Largest-city concentration · London

Sep 2, 2026Page data refreshed

Companies by employee count

1-10

548

11-50

243

51-200

201-500

1,001-5,000

5,001-10,000

10001+

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 the 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 United Kingdom 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, 6,063 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 2, 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

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 the United Kingdom?

RevenueBase identified 864 energy efficiency consulting firms headquartered in the 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?

British GAS, headquartered in Staines, 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 6,063 verified decision-maker contacts tracked across these 864 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 2, 2026.

Ready to reach these companies? Verified emails and direct dials for all 864 energy efficiency consulting firms based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Energy efficiency consulting firms by geography

Browse the directory

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.