Company lists · Data refreshed October 2026

Top 25 Energy efficiency startups based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Oct 12, 2026 355 companies tracked

RevenueBase identified 355 company matches for energy efficiency startups associated with the United Kingdom as of October 2026 and tracks 12,728 professional contacts across them, including 3,888 with verified work emails. London is the largest hub.

This list covers company matches for energy efficiency startups associated with the 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 12, 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 12, 2026 How this list was built

355Companies

12,728Contacts tracked

3,888Verified emails

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The 25 largest energy efficiency startups based in the United Kingdom

Ranked by team size

Top 25 of 355 company matches for energy efficiency startups based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 12, 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	British GAS	Exact match	Windsor, United KingdomHQ recorded Oct 12, 2026	10001+	9,535 contacts →
	Exact match “Taking care of things.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
2	CFP Energy	Exact match	London, United KingdomHQ recorded Oct 12, 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 12, 2026 · View company records in RevenueBase
3	ZTP	Exact match	London, United KingdomHQ recorded Oct 12, 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 12, 2026 · View company records in RevenueBase
4	TROO	Exact match	Doxford International Business Park, United KingdomHQ recorded Oct 12, 2026	51-200	112 contacts →
	Exact match “Managing business energy can be overwhelming.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
5	clearvue.business	Exact match	Gateshead, United KingdomHQ recorded Oct 12, 2026	51-200	79 contacts →
	Exact match “We enable businesses to succeed in the environmental components of their ESG strategies through comprehensive net zero consulting services and ground-breaking carbon and energy…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
6	AMBER	Exact match	Cardiff, United KingdomHQ recorded Oct 12, 2026	51-200	70 contacts →
	Exact match “We are an award-winning energy consultancy and certified B Corp™.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
7	Team Energy Auditing Agency LTD	Exact match	Milton Keynes, United KingdomHQ recorded Oct 12, 2026	51-200	70 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
8	ECO Logic Partners	Exact match	Team Valley, United KingdomHQ recorded Oct 12, 2026	11-50	63 contacts →
	Exact match “We bring good energy to the table to help you save yours.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
9	Energy Drive	Exact match	London, United KingdomHQ recorded Oct 12, 2026	51-200	59 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
10	Businesswise Solutions	Exact match	Nelson, United KingdomHQ recorded Oct 12, 2026	11-50	56 contacts →
	Exact match “We’re an energy management consultancy specialising in supporting energy-intensive businesses with energy procurement, energy management, and sustainability challenges.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
11	ECBS	Exact match	Hebburn, United KingdomHQ recorded Oct 12, 2026	51-200	54 contacts →
	Exact match “At ECBS we specialise in working with customers to significantly reduce their business utility costs and make the necessary steps towards a greener future.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
12	Carbonxgen Limited	Exact match	Sandhurst, United KingdomHQ recorded Oct 12, 2026	11-50	49 contacts →
	Exact match “Carbonxgen is a leading consultancy that specialises in solving complex energy and sustainability challenges.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
13	Cotopaxi LTD	Exact match	White Moss Business Park, United KingdomHQ recorded Oct 12, 2026	11-50	47 contacts →
	Exact match “Cotopaxi Energy is an independent engineering consultancy specialising in utility and carbon reduction.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
14	Fusion For Business	Exact match	Durham, United KingdomHQ recorded Oct 12, 2026	51-200	44 contacts →
	Exact match “At Fusion For Business, we believe in the value of genuine human connection - people doing business with people they trust.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
15	Everun	Exact match	Belfast, United KingdomHQ recorded Oct 12, 2026	11-50	42 contacts →
	Exact match “As the world is becoming much more energy conscious, businesses everywhere are turning to more sustainable models of energy usage.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
16	Savemoneycutcarbon	Exact match	Bury St Edmunds, United KingdomHQ recorded Oct 12, 2026	11-50	41 contacts →
	Exact match “SaveMoneyCutCarbon helps organisations reduce energy, water and carbon consumption across their buildings and operations.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
17	Brownlow Utilities	Exact match	Newton-le-willows., United KingdomHQ recorded Oct 12, 2026	11-50	41 contacts →
	Exact match “Brownlow Utilities - the energy and sustainability expert!” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
18	Cenergist	Exact match	Washington, United KingdomHQ recorded Oct 12, 2026	201-500	40 contacts →
	Exact match “Cenergist is a specialist energy and water efficiency company in the UK and Europe.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
19	On-Site Energy LTD	Exact match	Liverpool, United KingdomHQ recorded Oct 12, 2026	11-50	33 contacts →
	Exact match “On-Site Energy was founded to support energy intensive manufacturers to improve their energy efficiency and achieve their sustainability goals through innovation and an…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
20	Emissis	Exact match	Stokesley, United KingdomHQ recorded Oct 12, 2026	51-200	29 contacts →
	Exact match “Engineering energy efficiency that pays off.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
21	Ineco Energy	Exact match	Stoneleigh Park, United KingdomHQ recorded Oct 12, 2026	11-50	23 contacts →
	Exact match “Guiding businesses in their clean energy transition, by providing the best energy technology that prioritizes self-sufficiency, economic responsibility, and environmental…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
22	PRO Enviro LTD Certified B Corp	Exact match	Rugby, United KingdomHQ recorded Oct 12, 2026	11-50	20 contacts →
	Exact match “Pro Enviro is a specialist energy engineering and process optimisation consultancy, with over 30 years’ experience working with manufacturing and other business clients.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
23	Energy & Technical Services LTD	Exact match	Bristol, United KingdomHQ recorded Oct 12, 2026	11-50	20 contacts →
	Exact match “Energy and Technical Services is an expert in energy consulting and service and has been for 25th years.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
24	Powerhub Solutions	Exact match	Stockport, United KingdomHQ recorded Oct 12, 2026	11-50	20 contacts →
	Exact match “At Powerhub Solutions, we help businesses cut energy waste, lower costs, and reduce carbon, without compromising performance or guest experience.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
25	Energy Oasis	Exact match	Harrogate, United KingdomHQ recorded Oct 12, 2026	11-50	19 contacts →
	Exact match “Merging energy efficiency and renewable energy technologies to drive cost savings and combat climate change.” Recorded in the RevenueBase company graph · Oct 12, 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 “energy efficiency startups”. 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 355 energy efficiency startups based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 3,888 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Energy efficiency startups based in the United Kingdom at a glance

As of Oct 12, 2026

30.5%Verified-email coverage

35.9Average contacts per company

1-10Median size (employees)

14.9%Largest-city concentration · London

Oct 12, 2026Page data refreshed

Companies by employee count

1-10

216

11-50

106

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 355 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 the United Kingdom whose business descriptions match “energy efficiency startups” 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 3,888 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 12, 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.

Energy efficiency startups by metro

Energy efficiency startups in London53

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 “energy efficiency startups”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many energy efficiency startups are there based in the United Kingdom?

RevenueBase identified 355 company matches for energy efficiency startups associated with the 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?

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

Which city has the most energy efficiency startups?

London leads with 53 company records, followed by Manchester (16) and Newcastle Upon Tyne (8).

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 3,888 professional contacts with verified work emails tracked across these 355 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 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 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.