Company lists · Data refreshed October 2026

Top 25 Geothermal energy investment companies based in the United Kingdom

RevenueBase identified 90 company matches for geothermal energy investment companies associated with the United Kingdom as of October 2026 and tracks 1,334 professional contacts across them, including 530 with verified work emails. London is the largest hub.

This list covers company matches for geothermal energy investment companies 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
90Companies
1,334Contacts tracked
530Verified emails
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The 25 largest geothermal energy investment companies based in the United Kingdom

Ranked by team size
Top 25 of 90 company matches for geothermal energy investment companies 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.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchLondon, United KingdomHQ recorded Oct 13, 20261,001-5,000524 contacts →

Exact match

“Atlantica is a sustainable infrastructure company that owns, manages, develops, builds and invests in renewable energy, storage, efficient natural gas and heat, transmission lines…”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
2Exact matchSudbrooke, United KingdomHQ recorded Oct 13, 202651-20080 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
3Exact matchLondon, United KingdomHQ recorded Oct 13, 202651-20066 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
4Exact matchBristol, United KingdomHQ recorded Oct 13, 202611-5059 contacts →

Exact match

“Aura Power is a renewable energy developer and Independent Power Producer (IPP), developing and delivering high-quality solar and battery storage projects that contribute to a…”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
5Exact matchLondon, United KingdomHQ recorded Oct 13, 202651-20058 contacts →

Exact match

“Nexta Capital Partners is a holding company which originates, develops, finances builds and operates renewable infrastructure assets.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
6Exact matchLondon, United KingdomHQ recorded Oct 13, 202611-5044 contacts →

Exact match

“Gore Street Capital was formed in 2015 as a global platform to acquire and manage renewable energy assets.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
7Exact matchKings Cross, United KingdomHQ recorded Oct 13, 202611-5038 contacts →

Exact match

“Greenfield specialise in the investment, development and delivery of sustainable and renewable-led infrastructure projects.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
8Exact matchEast Wellow, United KingdomHQ recorded Oct 13, 2026201-50029 contacts →

Exact match

“Hive Energy is on a mission to save the planet.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
9Exact matchGreat Yarmouth, United KingdomHQ recorded Oct 13, 202611-5029 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
10Exact matchBournemouth, United KingdomHQ recorded Oct 13, 202611-5027 contacts →

Exact match

“Owned by funds advised by Octopus Energy Generation, one of Europe’s largest renewable energy investors currently managing renewable assets totalling more than £5bn, we are…”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
11Exact matchLondon, United KingdomHQ recorded Oct 13, 202611-5026 contacts →

Exact match

“Since 2015 we have become a dominant investor in the rapidly expanding land for energy market, in particular, reserve power generation and storage facilities.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
12Exact matchStokesley, United KingdomHQ recorded Oct 13, 202611-5022 contacts →

Exact match

“Carlton Power Group is an independent, UK energy development company formed in 1995, with offices in Stokesley, North Yorkshire and Edinburgh.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
13Exact matchRedruth, United KingdomHQ recorded Oct 13, 20261-1016 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
14Exact matchEdinburgh City, United KingdomHQ recorded Oct 13, 202611-5016 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
15Exact matchLondon, United KingdomHQ recorded Oct 13, 20261-1012 contacts →

Exact match

“Buckthorn invests in industrial businesses providing products and services that support the growth and integration of renewable energy, lower emissions, energy efficiency and…”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
16Exact matchLondon, United KingdomHQ recorded Oct 13, 202611-5011 contacts →

Exact match

“We invest in new energy technologies.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
17Exact matchLondon, United KingdomHQ recorded Oct 13, 20261-1010 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
18Exact matchLondon, United KingdomHQ recorded Oct 13, 20261-1010 contacts →

Exact match

“Telis Energy is a UK-based green energy projects developer and investor.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
19Exact matchCornwall, United KingdomHQ recorded Oct 13, 202611-507 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
20Exact matchWeardale, United KingdomHQ recorded Oct 13, 202611-507 contacts →

Exact match

“Weardale Lithium limited is a natural resources exploration and development company.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
21Exact matchBelfast, United KingdomHQ recorded Oct 13, 20261-107 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
22Exact matchNewcastle Upon Tyne, United KingdomHQ recorded Oct 13, 202611-506 contacts →

Exact match

“Founded in 2018, Windel Energy is a privately held company dedicated to driving the transition towards a sustainable future.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
23Exact matchLondon, United KingdomHQ recorded Oct 13, 202611-506 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
24Exact matchBordon, United KingdomHQ recorded Oct 13, 202611-505 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
25Exact matchOldbury, United KingdomHQ recorded Oct 13, 20261-105 contacts →

Exact match

“Green Tech Hub is a friendly, customer-focused renewable energy company based in Birmingham, UK.”

Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase

Showing 25 of 90 geothermal energy investment companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 530 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Geothermal energy investment companies based in the United Kingdom at a glance

As of Oct 13, 2026
39.7%Verified-email coverage
14.8Average contacts per company
1-10Median size (employees)
50.0%Largest-city concentration · London
Oct 13, 2026Page data refreshed

Companies by employee count

1-10
50
11-50
30
51-200
7
201-500
2
1,001-5,000
1

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 90 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 investment companies” 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 530 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 investment companies by metro

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 investment companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 90 company matches for geothermal energy investment companies 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?

Atlantica Sustainable Infrastructure PLC tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most geothermal energy investment companies?

London leads with 45 company records, followed by Aberdeen (2) and Bournemouth (2).

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 530 professional contacts with verified work emails tracked across these 90 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.