Company lists · Data refreshed September 2026

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

Name: Energy efficiency investment 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 62 companies tracked

RevenueBase identified 62 energy efficiency investment firms headquartered in London, United Kingdom as of September 2026 and tracks 555 professional contacts across them, including 263 with verified work emails and 49 with mobile numbers. London is the largest hub.

This list covers energy efficiency investment 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

62Companies

555Contacts tracked

263Verified emails

49Mobile numbers

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

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

Ranked by team size

Top 23 of 62 energy efficiency investment 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 investment 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	Sustainable Development Capital, LLP Sdcl	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	74 contacts →
	Partial evidence “Sustainable Development Capital LLP (“SDCL”) is a multi-national investment and financial advisory firm, which specialises in environmental infrastructure.” Source: RevenueBase Database · checked Sep 12, 2026
2	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
3	Bluewater	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	39 contacts →
	Partial evidence “Bluewater is a specialist international private equity firm focused on the middle-market energy sector.” Source: RevenueBase Database · checked Sep 12, 2026
4	Tallarna	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	15 contacts →
	Indirect evidence “Tallarna is a climate tech and finance platform for sustainable impact.” Source: RevenueBase Database · checked Sep 12, 2026
5	Clean Energy Transition LLP	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	14 contacts →
	Strong evidence “Clean Energy Transition LLP is an investment management partnership focused on fundamental equity investing.” Source: RevenueBase Database · checked Sep 12, 2026
6	United Capital	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	501-1,000	14 contacts →
	Indirect evidence “United Capital Group invest in consolidating the fragmented UK building and home services market, with a primary focus on the de-carbonisation of the sector.” Source: RevenueBase Database · checked Sep 12, 2026
7	Clean Growth Fund	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	13 contacts →
	Partial evidence “CGF invest in tech innovations that reduce greenhouse gas emissions or improve resource efficiency across power, transport, industry, buildings, waste and water.” Source: RevenueBase Database · checked Sep 12, 2026
8	Buckthorn Partners LLP	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	11 contacts →
	Strong evidence “Buckthorn invests in industrial businesses providing products and services that support the growth and integration of renewable energy, lower emissions, energy efficiency and…” Source: RevenueBase Database · checked Sep 12, 2026
9	Susten	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	11 contacts →
	Partial evidence “We invest in new energy technologies.” Source: RevenueBase Database · checked Sep 12, 2026
10	Telis Energy	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	11 contacts →
	Partial evidence “Telis Energy is a UK-based green energy projects developer and investor.” Source: RevenueBase Database · checked Sep 12, 2026
11	Econest	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	8 contacts →
	Strong evidence “Econest is an AI-enabled asset manager that sources and purchases energy inefficient properties to retrofit and manage at scale for large investment portfolios.” Source: RevenueBase Database · checked Sep 12, 2026
12	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
13	Infraland	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	5 contacts →
	Indirect evidence “Infraland is a low carbon infrastructure development company, bridging the gap between investors and property owners to facilitate high tech projects for a more sustainable world.” Source: RevenueBase Database · checked Sep 12, 2026
14	Shorelight Partners	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	4 contacts →
	Partial evidence “Shorelight supports the Energy Transition towards lower emissions by investing in assets and technologies that operate in the lower carbon energy value chain, or help high…” Source: RevenueBase Database · checked Sep 12, 2026
15	Industrious	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	3 contacts →
	Partial evidence “Why we exist - To cut businesses energy use with renewable technologies - A reduced carbon footprint means lower monthly energy bills - We manage your energy provider and switch…” Source: RevenueBase Database · checked Sep 12, 2026
16	Aurium Capital	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	2 contacts →
	Partial evidence “Founded in 2011, Aurium is an award-winning, mid-market investment firm dedicated to delivering a fairer, more sustainable planet.” Source: RevenueBase Database · checked Sep 12, 2026
17	Carbon Sure Consulting LTD	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	2 contacts →
	Indirect evidence “Carbon Sure Mission Statement • To support businesses reducing their carbon footprint.” Source: RevenueBase Database · checked Sep 12, 2026
18	Io-Gen	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	2 contacts →
	Strong evidence “IO-Gen offers a smart and complete energy efficiency solution to your business operations, by leveraging the power of technology and information, our core services are entirely…” Source: RevenueBase Database · checked Sep 12, 2026
19	Sustainability Investors LLP	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	2 contacts →
	Partial evidence “Sustainability Investors LLP is a London-based environmental impact technology venture capital firm with a specialist expertise in energy and resource productivity markets and…” Source: RevenueBase Database · checked Sep 12, 2026
20	Superowner	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	2 contacts →
	Strong evidence “Energy efficiency increases real estate value.” Source: RevenueBase Database · checked Sep 12, 2026
21	IUS Global	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	1 contacts →
	Strong evidence “IUS Global was established as a consortium of companies with mutual interest in developing efficient, sustainable, high-value clean and green energy solutions with No Capital…” Source: RevenueBase Database · checked Sep 12, 2026
22	Carbon Accelerator	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	1 contacts →
	Strong evidence “Carbon Accelerator develops low-carbon energy and utilities projects and uses its investment expertise to scout, assess and support cleantech start ups to reach their full…” Source: RevenueBase Database · checked Sep 12, 2026
23	OAK And Green	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	1 contacts →
	Strong evidence “We invest in, develop and advise energy generation and efficiency projects.” 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 investment 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 investment firms.
Partial evidence: Its own public description names part of energy efficiency investment 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 investment 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 62 energy efficiency investment firms based in London, United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 263 reachable decision-makers.

Free signup · no credit card

View the full list →

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

As of Sep 12, 2026

47.4%Verified-email coverage

8.8%Mobile-number coverage

9.0Average contacts per company

1-10Median size (employees)

145.2%Largest-city concentration · London

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

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

Email last verified

Median 15.0d

2320–30

2831–60

261–90

090–180

1180+

Company record updated

Median 56.0d

00–30

30431–60

16361–90

5190–180

37180+

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 investment 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 investment 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 investment 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 investment 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, 263 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 investment firms by metro in the United Kingdom

Energy efficiency investment firms in London90

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 investment 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 investment firms are there based in London, United Kingdom?

RevenueBase identified 62 energy efficiency investment 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?

Sustainable Development Capital, LLP Sdcl, headquartered in London, tops this list with the largest team on record.

Which city has the most energy efficiency investment firms?

London leads with 90 headquartered companies, followed by Manchester (10) and Cambridge (3).

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 263 verified decision-maker contacts tracked across these 62 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.

Ready to reach these companies? Verified emails and direct dials for all 62 energy efficiency investment firms based in London, United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Energy efficiency investment 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.