Company lists · Data refreshed September 2026

Top 25 Green energy investment firms based in the United Kingdom

Name: Green energy investment 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 3, 2026 620 companies tracked

RevenueBase identified 620 green energy investment firms headquartered in the United Kingdom as of September 2026 and tracks 18,374 professional contacts across them, including 6,325 with verified work emails and 1,269 with mobile numbers. London is the largest hub.

This list covers green energy investment 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 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 HQ checked on every row Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review

620Companies

18,374Contacts tracked

6,325Verified emails

1,269Mobile numbers

Unlock all 620 companies Free signup · no credit card · 500 free credits

The 25 largest green energy investment firms based in the United Kingdom

Ranked by team size

Top 25 of 620 green energy investment firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names green energy investment firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	SSE RenewablesPartial evidence	Perth, United KingdomHQ checked Sep 3, 2026	1,001-5,000	1,895
	“SSE Renewables is a leading developer and operator of renewable energy generation, headquartered in the UK and Ireland, with a growing presence internationally.” Source: company website · checked Sep 3, 2026
2	Lightsource BPPartial evidence	London, United KingdomHQ checked Sep 3, 2026	1,001-5,000	1,146
	“Lightsource bp is working to support a future powered by renewable, affordable and reliable energy that benefits our partners, people and planet.” Source: company website · checked Sep 3, 2026
3	Cubico Sustainable InvestmentsStrong evidence	London, United KingdomHQ checked Sep 3, 2026	501-1,000	406
	“Cubico Sustainable Investments is one of the world’s largest privately-owned renewable energy companies, leveraging our strong local presence with a unique combination of in-house…” Source: company website · checked Sep 3, 2026
4	ZenobēPartial evidence	London, United KingdomHQ checked Sep 3, 2026	201-500	334
	“We're Zenobē Energy and we're on a mission to make clean power accessible.” Source: company website · checked Sep 3, 2026
5	Fuse EnergyPartial evidence	London, United KingdomHQ checked Sep 3, 2026	501-1,000	276
	“We are building a full stack energy company to lower cost of energy & accelerate energy abundance.” Source: company website · checked Sep 3, 2026
6	Ethical PowerIndirect evidence	Exeter, United KingdomHQ checked Sep 3, 2026	51-200	227
	“Ethical Power Group launched in the UK in 2010.” Source: company website · checked Sep 3, 2026
7	Anesco LTDPartial evidence	Reading, United KingdomHQ checked Sep 3, 2026	201-500	215
	“Anesco is a market leader in renewable energy and energy efficiency.” Source: company website · checked Sep 3, 2026
8	LOW CarbonPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	204
	“Low Carbon creates renewable energy to fight climate change.” Source: company website · checked Sep 3, 2026
9	Octopus Energy GenerationStrong evidence	London, United KingdomHQ checked Sep 3, 2026	201-500	152
	“At Octopus Energy Generation, we’re building green power for the future, from large-scale solar to onshore and offshore wind, and innovative initiatives like the Fan Club.” Source: company website · checked Sep 3, 2026
10	AESPartial evidence	Enfield, United KingdomHQ checked Sep 3, 2026	201-500	112
	“As renewable energy technology experts, we have the knowledge and skills to help commercial clients switch to a greener, lower cost and more independent energy source.” Source: company website · checked Sep 3, 2026
11	Nextenergy CapitalPartial evidence	London, United KingdomHQ checked Sep 3, 2026	201-500	83
	“NextEnergy Capital was founded in 2007 to become the leading specialist investment and asset manager in the solar sector.” Source: company website · checked Sep 3, 2026
12	InnovaPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	76
	“Innova is a forward-thinking renewable energy business, employing people across two offices in London and Cheltenham.” Source: company website · checked Sep 3, 2026
13	RED Rock RenewablesPartial evidence	Edinburgh, United KingdomHQ checked Sep 3, 2026	51-200	65
	“Red Rock Renewables is an investor, owner, operator and developer of renewable energy projects.” Source: company website · checked Sep 3, 2026
14	Nexta Capital PartnersIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	65
	“Nexta Capital Partners is a holding company which originates, develops, finances builds and operates renewable infrastructure assets.” Source: company website · checked Sep 3, 2026
15	Ecolution GroupPartial evidence	Trottiscliffe, United KingdomHQ checked Sep 3, 2026	51-200	54
	“Renewable Energy Experts: For over 25 years, Ecolution have been at the forefront of renewable energy services, using our award-winning expertise, to help our clients innovate and…” Source: company website · checked Sep 3, 2026
16	Ylem EnergyPartial evidence	Manchester, United KingdomHQ checked Sep 3, 2026	51-200	51
	“YLEM Energy is a leading independent power generation specialist with more than three decades’ experience in building, owning and operating smart generation systems.” Source: company website · checked Sep 3, 2026
17	Elements GreenStrong evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	50
	“Elements Green (EG) is a leading renewable energy developer headquartered in London, specialising in utility-scale solar PV systems and battery energy storage solutions.” Source: company website · checked Sep 3, 2026
18	Renewable Power CapitalPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	49
	“We invest in the development, construction, and long-term ownership of solar, onshore wind and battery storage projects, enabling the energy transition and driving stable…” Source: company website · checked Sep 3, 2026
19	ARC PowerPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	47
	“ARC Power is at the forefront of renewable energy innovation in Africa, dedicated to transforming lives through energy access in underserved regions.” Source: company website · checked Sep 3, 2026
20	National EnergyPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	40
	“Founded in 2018 by ambitious entrepreneurs, National Energy is a US-backed, privately funded group active globally across the renewable energy sector.” Source: company website · checked Sep 3, 2026
21	Oxygen House GroupStrong evidence	Exeter, United KingdomHQ checked Sep 3, 2026	51-200	40
	“Oxygen House focuses on impact investment in data analytics, education, sustainable property development, renewable energy, and city planning, leveraging patient capital for a…” Source: company website · checked Sep 3, 2026
22	Natpower UKPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	38
	“NatPower UK has the largest clean energy development programme in the UK, aiming at integrating large scale smart clean energy generation and distribution with large scale…” Source: company website · checked Sep 3, 2026
23	Jera NEXPartial evidence	London, United KingdomHQ checked Sep 3, 2026	201-500	33
	“JERA Nex is an onshore renewable energy developer launched by JERA, Japan's largest power generation company.” Source: company website · checked Sep 3, 2026
24	Muirhall EnergyPartial evidence	Auchengray Carnwath, United KingdomHQ checked Sep 3, 2026	51-200	31
	“Led and managed by a dynamic team, Muirhall have constructed over 150MW of renewable energy projects across the UK, with a further 3GW either consented or in planning.” Source: company website · checked Sep 3, 2026
25	Making Energy GreenerPartial evidence	Southport, United KingdomHQ checked Sep 3, 2026	51-200	21
	“With over 20 years of experience in the energy services sector, Making Energy Greener are committed to transforming our community's homes with innovative energy-saving products…” Source: company website · checked Sep 3, 2026

Showing 25 of 620 green energy investment firms based in the United Kingdom

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Green energy investment firms based in the United Kingdom at a glance

As of Sep 3, 2026

1-10Median size (employees)

LondonLargest hub · 333 HQs

1,269Contacts with mobile numbers

Sep 3, 2026Data refreshed

Companies by employee count

1-10

337

11-50

198

51-200

201-500

501-1,000

1,001-5,000

10001+

Verified emails by last verification

0–30

31–60

595

61–90

3,588

90–180

2,111

180+

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 green energy investment firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “green energy investment firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among green energy investment 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 an evidence 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, 6,325 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 3, 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.

Green energy investment firms by metro

Green energy investment firms in London333

Frequently asked

How many green energy investment firms are there based in the United Kingdom?

RevenueBase identified 620 green energy investment 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?

SSE Renewables, headquartered in Glasgow, tops this list with the largest team on record.

Which city has the most green energy investment firms?

London leads with 333 headquartered companies, followed by Edinburgh (12) and Glasgow (9).

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 6,325 verified decision-maker contacts tracked across these 620 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 3, 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.