Company lists · Data refreshed October 2026

Top 25 Geothermal energy nonprofits based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Oct 13, 2026 114 companies tracked

RevenueBase identified 114 company matches for geothermal energy nonprofits associated with the United Kingdom as of October 2026 and tracks 946 professional contacts across them, including 399 with verified work emails. London is the largest hub.

This list covers company matches for geothermal energy nonprofits 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 13, 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 13, 2026 How this list was built

114Companies

946Contacts tracked

399Verified emails

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The 25 largest geothermal energy nonprofits based in the United Kingdom

Ranked by team size

Top 25 of 114 company matches for geothermal energy nonprofits based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 13, 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	KENSA	Exact match	Truro, United KingdomHQ recorded Oct 13, 2026	51-200	136 contacts →
	Exact match “The UK’s heating system is stuck in the past, costing people and the planet too much.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
2	Star Energy Group PLC	Exact match	Sudbrooke, United KingdomHQ recorded Oct 13, 2026	51-200	80 contacts →
	Exact match “Star Energy Group plc is a British energy business.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
3	Rendesco	Exact match	London, United KingdomHQ recorded Oct 13, 2026	51-200	66 contacts →
	Exact match “Rendesco is the UK’s leading clean energy tech developer and operator, focusing on the electrification of heat using heat pumps and heat networks to decarbonise Britain’s…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
4	Pacific Green	Exact match	London, United KingdomHQ recorded Oct 13, 2026	51-200	58 contacts →
	Exact match “Pacific Green is becoming a world leader at providing sustainable cleantech solutions to help solve climate warming, green energy and resource scarcity challenges.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
5	Sundrop Farms	Exact match	London, United KingdomHQ recorded Oct 13, 2026	201-500	50 contacts →
	Exact match “Sundrop Farms is a pioneer in sustainable agriculture, growing high-value fruits and vegetables using renewable inputs.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
6	Olympus Power LTD	Exact match	Exeter, United KingdomHQ recorded Oct 13, 2026	11-50	32 contacts →
	Exact match “Olympus Power is an award-winning Energy Concierge, helping UK businesses take greater control of their energy strategy, costs and long-term resilience.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
7	Ortus Energy	Exact match	London, United KingdomHQ recorded Oct 13, 2026	11-50	29 contacts →
	Exact match “Ortus Energy is powering up industry across the UK & Ireland by delivering on-site renewable energy on a commercial scale.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
8	Geothermal Development Company	Exact match	Great Yarmouth, United KingdomHQ recorded Oct 13, 2026	11-50	29 contacts →
	Exact match “CeraPhi Energy is a leading project development company delivering global geothermal energy solutions at scale.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
9	Heat Geek	Exact match	London, United KingdomHQ recorded Oct 13, 2026	11-50	28 contacts →
	Exact match “Heat Geek is renewing the heating industry.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
10	The MCS Foundation	Exact match	Cheshire, United KingdomHQ recorded Oct 13, 2026	1-10	27 contacts →
	Exact match “Our vision is to make every UK home carbon-free.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
11	Boxergy	Exact match	Livingston, United KingdomHQ recorded Oct 13, 2026	11-50	17 contacts →
	Exact match “Boxergy’s purpose is to make renewables affordable for all and to reduce the carbon emissions from home heating on a national scale.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
12	Geothermal Engineering LTD	Exact match	Redruth, United KingdomHQ recorded Oct 13, 2026	1-10	16 contacts →
	Exact match “GEL has brought the most experienced geothermal engineers together with leading industry partners to develop the UK's first large-scale geothermal energy plant in Cornwall.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
13	Townrock Energy	Exact match	Edinburgh City, United KingdomHQ recorded Oct 13, 2026	11-50	16 contacts →
	Exact match “We are an award-winning geothermal company based in Edinburgh, Scotland and a leading specialist in all aspects of the UK’s geothermal resources.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
14	Aeon Energy	Exact match	London, United KingdomHQ recorded Oct 13, 2026	1-10	12 contacts →
	Exact match “Humans are surrounded by natural energy, yet, more than two-thirds of the world's electricity comes from fossil fuels.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
15	Green Britain Group	Exact match	Stroud, United KingdomHQ recorded Oct 13, 2026	501-1,000	11 contacts →
	Exact match “The Green Britain Group is at the forefront of the global green industrial revolution.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
16	Flowing Energy Solutions	Exact match	Washington, United KingdomHQ recorded Oct 13, 2026	11-50	10 contacts →
	Exact match “Flowing Energy Solutions are focused on creating a greener future by reducing each homes carbon footprint.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
17	Thermly	Exact match	Manchester, United KingdomHQ recorded Oct 13, 2026	11-50	10 contacts →
	Exact match “Want to futureproof your home, reduce your carbon emissions and energy costs?” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
18	Erda Energy	Exact match	London, United KingdomHQ recorded Oct 13, 2026	1-10	10 contacts →
	Exact match “Smart, sustainable heating and cooling, powered by the earth.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
19	The Energy LAB UK	Exact match	Barnstaple, United KingdomHQ recorded Oct 13, 2026	1-10	8 contacts →
	Exact match “Energy Lab has been supporting specifiers, developers and installers of geothermal and air source heat pumps since 2012.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
20	Eden Geothermal Limited	Exact match	Cornwall, United KingdomHQ recorded Oct 13, 2026	11-50	7 contacts →
	Exact match “Eden Geothermal Ltd is a partnership between Eden Project, EGS Energy Ltd, and Bestec (UK) Ltd, set up to unlock the geothermal energy deep in the granite beneath Cornwall.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
21	Causeway Energies	Exact match	Belfast, United KingdomHQ recorded Oct 13, 2026	1-10	7 contacts →
	Exact match “There is a renewable energy source that is available all day, every day, whatever the weather.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
22	HEATA	Exact match	Godalming, United KingdomHQ recorded Oct 13, 2026	1-10	7 contacts →
	Exact match “Data Centres already emit more carbon than the entire aviation industry, and with AI fuelling a new boom in data centre construction, they will consume almost 10% of global…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
23	Geothermal Energy Forum	Exact match	London, United KingdomHQ recorded Oct 13, 2026	11-50	6 contacts →
	Exact match “The Geothermal Energy Forum a new, dedicated platform within the REA, to help drive growth in this high potential sector was created following the acquisition of GEAA by the REA…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
24	Co2sense CIC	Exact match	London, United KingdomHQ recorded Oct 13, 2026	1-10	6 contacts →
	Exact match “CO2Sense is the trusted partner for turning clean energy ambitions into reality.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
25	Onsen Energy	Exact match	Bordon, United KingdomHQ recorded Oct 13, 2026	11-50	5 contacts →
	Exact match “At Onsen Energy, we provide homeowners, developers, sports clubs, schools and the wider energy market with ground source heating systems and drilling services.” Recorded in the RevenueBase company graph · Oct 13, 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 “geothermal energy nonprofits”. 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 114 geothermal energy nonprofits based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 399 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Geothermal energy nonprofits based in the United Kingdom at a glance

As of Oct 13, 2026

42.2%Verified-email coverage

8.3Average contacts per company

1-10Median size (employees)

24.6%Largest-city concentration · London

Oct 13, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 114 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 “geothermal energy nonprofits” 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 399 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 13, 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.

Geothermal energy nonprofits by metro

Geothermal energy nonprofits in London28

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

How many geothermal energy nonprofits are there based in the United Kingdom?

RevenueBase identified 114 company matches for geothermal energy nonprofits 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?

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

Which city has the most geothermal energy nonprofits?

London leads with 28 company records, followed by Bristol (5) and Aberdeen (3).

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 399 professional contacts with verified work emails tracked across these 114 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 13, 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.