Company lists · Data refreshed September 2026

Top 25 Alternative energy developers based in the United Kingdom

Name: Alternative energy developers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 1,476 companies tracked

RevenueBase identified 1,476 alternative energy developers headquartered in the United Kingdom as of September 2026 and tracks 32,065 professional contacts across them, including 11,506 with verified work emails. London is the largest hub.

This list covers alternative energy developers 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 30, 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 30, 2026 86% judged on-target in blind review

1,476Companies

32,065Contacts tracked

11,506Verified emails

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

The 25 largest alternative energy developers based in the United Kingdom

Ranked by team size

Top 25 of 1,476 alternative energy developers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to alternative energy developers: 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	Octopus Energy	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	3,989 contacts →
	Partial evidence “We're on a mission to make a big green dent in the universe by building a truly sustainable energy system globally.” Source: RevenueBase Database · checked Sep 30, 2026
2	RES	Partial evidence	Kings Langley, United KingdomHQ checked Sep 30, 2026	1,001-5,000	3,721 contacts →
	Partial evidence “RES is the world’s largest independent renewable energy company, working across 24 countries and active in wind, solar, energy storage, green hydrogen, transmission, and…” Source: RevenueBase Database · checked Sep 30, 2026
3	SSE Renewables	Strong evidence	Perth, United KingdomHQ checked Sep 30, 2026	1,001-5,000	1,900 contacts →
	Strong evidence “SSE Renewables is a leading developer and operator of renewable energy generation, headquartered in the UK and Ireland, with a growing presence internationally.” Source: RevenueBase Database · checked Sep 30, 2026
4	Lightsource BP	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	1,114 contacts →
	Partial evidence “Lightsource bp is working to support a future powered by renewable, affordable and reliable energy that benefits our partners, people and planet.” Source: RevenueBase Database · checked Sep 30, 2026
5	Clarke Energy	Partial evidence	Liverpool, United KingdomHQ checked Sep 30, 2026	1,001-5,000	1,049 contacts →
	Partial evidence “Clarke Energy, a Rehlko company, specialises in energy efficient, low carbon and flexible energy systems.” Source: RevenueBase Database · checked Sep 30, 2026
6	Nadara	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	501-1,000	629 contacts →
	Partial evidence “We’re Nadara, one of Europe’s largest renewable energy independent power producers.” Source: RevenueBase Database · checked Sep 30, 2026
7	Sonnedix	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	501-1,000	563 contacts →
	Partial evidence “Sonnedix is a global renewable energy company delivering 100% clean electricity directly to customers through a diversified portfolio of solar, wind, and storage assets.” Source: RevenueBase Database · checked Sep 30, 2026
8	Natural Power	Partial evidence	Castle Douglas, United KingdomHQ checked Sep 30, 2026	501-1,000	500 contacts →
	Partial evidence “Natural Power is a leading independent consultancy and service provider for the renewable energy sector.” Source: RevenueBase Database · checked Sep 30, 2026
9	Cubico Sustainable Investments	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	501-1,000	406 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 30, 2026
10	SO Energy	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	378 contacts →
	Partial evidence “We do energy, you do you.” Source: RevenueBase Database · checked Sep 30, 2026
11	Intec Energy Solutions	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	501-1,000	242 contacts →
	Partial evidence “INTEC Energy Solutions delivers best-in-class services in Engineering, Procurement, Construction (EPC), Battery Energy Storage Systems (BESS), Manufacturing, Project Development…” Source: RevenueBase Database · checked Sep 30, 2026
12	Ethical Power	Indirect evidence	Exeter, United KingdomHQ checked Sep 30, 2026	51-200	231 contacts →
	Indirect evidence “Ethical Power Group launched in the UK in 2010.” Source: RevenueBase Database · checked Sep 30, 2026
13	Anesco LTD	Partial evidence	Aldermaston Nr Reading, United KingdomHQ checked Sep 30, 2026	201-500	216 contacts →
	Partial evidence “Anesco is a market leader in renewable energy and energy efficiency.” Source: RevenueBase Database · checked Sep 30, 2026
14	VPI	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	214 contacts →
	Indirect evidence “With a capacity of 3.5GW, we are one of the leading power companies in the UK and Ireland.” Source: RevenueBase Database · checked Sep 30, 2026
15	LOW Carbon	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	195 contacts →
	Partial evidence “Low Carbon creates renewable energy to fight climate change.” Source: RevenueBase Database · checked Sep 30, 2026
16	Wood Thilsted	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	175 contacts →
	Partial evidence “Wood Thilsted is a world-leading renewable energy engineering consultancy experienced and specialised in offshore wind.” Source: RevenueBase Database · checked Sep 30, 2026
17	Eastgate Engineering	Indirect evidence	Thornaby-on-tees, United KingdomHQ checked Sep 30, 2026	201-500	163 contacts →
	Indirect evidence “Eastgate Engineering is an Electrical and Instrumentation contractor that delivers complex, high-risk infrastructure projects with cost certainty, without compromising safety or…” Source: RevenueBase Database · checked Sep 30, 2026
18	Flotation Energy	Partial evidence	Edinburgh, United KingdomHQ checked Sep 30, 2026	51-200	154 contacts →
	Partial evidence “Flotation Energy Ltd delivers clean, green, renewable energy by using our expertise in floating and fixed offshore wind and the energy transition, supporting achievement of…” Source: RevenueBase Database · checked Sep 30, 2026
19	Octopus Energy Generation	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	153 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 30, 2026
20	British Solar Renewables	Partial evidence	Shepton Mallet, United KingdomHQ checked Sep 30, 2026	51-200	148 contacts →
	Partial evidence “Clean energy, powered with purpose.” Source: RevenueBase Database · checked Sep 30, 2026
21	Cero Generation	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	145 contacts →
	Partial evidence “We’re focused on developing and delivering utility-scale solar and battery energy storage system (BESS) projects that power the transition to a cleaner, more resilient energy…” Source: RevenueBase Database · checked Sep 30, 2026
22	Bryt Energy	Indirect evidence	Birmingham, United KingdomHQ checked Sep 30, 2026	51-200	129 contacts →
	Indirect evidence “Part of the Statkraft group, we provide British businesses with zero carbon, 100% renewable electricity*, sourced solely from Solar, Wind and Hydro.” Source: RevenueBase Database · checked Sep 30, 2026
23	Powersystems	Indirect evidence	Bristol, United KingdomHQ checked Sep 30, 2026	51-200	126 contacts →
	Indirect evidence “Powered by People.” Source: RevenueBase Database · checked Sep 30, 2026
24	EDF Renewables UK & Ireland	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	501-1,000	117 contacts →
	Partial evidence “EDF Renewables is part of one of the world’s leading renewable energy companies in the UK.” Source: RevenueBase Database · checked Sep 30, 2026
25	Sunel Group	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	113 contacts →
	Partial evidence “SUNEL GROUP is a globally recognized EPC Contractor and Developer for Solar projects.” Source: RevenueBase Database · checked Sep 30, 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: alternative energy developers. 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 alternative energy developers.
Partial evidence: Its own public description names part of alternative energy developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name alternative energy developers. 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 1,476 alternative energy developers based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 11,506 reachable decision-makers.

Free signup · no credit card

View the full list →

Alternative energy developers based in the United Kingdom at a glance

As of Sep 30, 2026

35.9%Verified-email coverage

21.7Average contacts per company

11-50Median size (employees)

18.6%Largest-city concentration · London

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

729

11-50

547

51-200

142

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 1,476 companies.

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 alternative energy developers, 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 “alternative energy developers”. 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 alternative energy developers), 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 alternative energy developers, 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, 11,506 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 30, 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.

Alternative energy developers 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 alternative energy developers, 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 alternative energy developers are there based in the United Kingdom?

RevenueBase identified 1,476 alternative energy developers 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?

Octopus Energy, headquartered in London, tops this list with the largest team on record.

Which city has the most alternative energy developers?

London leads with 275 headquartered companies, followed by Glasgow (29) and Edinburgh (26).

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 11,506 verified decision-maker contacts tracked across these 1,476 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 30, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,476 alternative energy developers based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Alternative energy developers 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.