Company lists · Data refreshed September 2026

Top 25 Geothermal exploration companies based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 150 companies tracked

RevenueBase identified 150 geothermal exploration companies headquartered in the United Kingdom as of September 2026 and tracks 2,279 professional contacts across them, including 448 with verified work emails. London is the largest hub.

This list covers geothermal exploration companies 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 20, 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 20, 2026 86% judged on-target in blind review

150Companies

2,279Contacts tracked

448Verified emails

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The 25 largest geothermal exploration companies based in the United Kingdom

Ranked by team size

Top 25 of 150 geothermal exploration companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal exploration companies: 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	EPI Group	Indirect evidence	Fleet, United KingdomHQ checked Sep 20, 2026	11-50	144 contacts →
	Indirect evidence “EPI Group is a leading provider of specialist geoscience, QHSE, environmental and technical services for the energy industry worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
2	Cornish Lithium PLC	Indirect evidence	Penryn, United KingdomHQ checked Sep 20, 2026	11-50	97 contacts →
	Indirect evidence “Cornish Lithium is pioneering the clean extraction of lithium to support the UK’s transition to renewable energy and secure a domestic supply for the batteries that power consumer…” Source: RevenueBase Database · checked Sep 20, 2026
3	Star Energy Group PLC	Indirect evidence	Sudbrooke, United KingdomHQ checked Sep 20, 2026	51-200	83 contacts →
	Indirect evidence “Star Energy Group plc is a British energy business.” Source: RevenueBase Database · checked Sep 20, 2026
4	Getech	Indirect evidence	Leeds, United KingdomHQ checked Sep 20, 2026	51-200	82 contacts →
	Indirect evidence “Getech is a leading locator of subsurface resources essential for the world's energy security and sustainable transition.” Source: RevenueBase Database · checked Sep 20, 2026
5	Zetica Limited	Indirect evidence	Eynsham, United KingdomHQ checked Sep 20, 2026	51-200	75 contacts →
	Indirect evidence “Zetica is the UK’s leader in engineering and environmental geophysics, with an enviable reputation for objective advice, novel problem solving, consistently high-quality surveys…” Source: RevenueBase Database · checked Sep 20, 2026
6	Dando Drilling International	Strong evidence	Arundel, United KingdomHQ checked Sep 20, 2026	51-200	29 contacts →
	Strong evidence “Dando Drilling International has over 150 years experience of supplying drilling rigs and equipment for the water well, mineral exploration, geotechnical & geothermal sectors.” Source: RevenueBase Database · checked Sep 20, 2026
7	Geothermal Development Company	Partial evidence	Great Yarmouth, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Partial evidence “CeraPhi Energy is a leading project development company delivering global geothermal energy solutions at scale.” Source: RevenueBase Database · checked Sep 20, 2026
8	Metatek	Indirect evidence	Milton Keynes, United KingdomHQ checked Sep 20, 2026	11-50	26 contacts →
	Indirect evidence “Metatek is a global geophysical services company providing high-definition mapping of subsurface strategic and critical mineral natural resources, energy (including hydrocarbons)…” Source: RevenueBase Database · checked Sep 20, 2026
9	Ariana Resources PLC	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	24 contacts →
	Partial evidence “Ariana Resources is an AIM-listed gold exploration and development company focused on precious and technology metals.” Source: RevenueBase Database · checked Sep 20, 2026
10	Drilcorp	Indirect evidence	Seaham, United KingdomHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “Drilcorp was established in 1992 and since then has developed into one of the UK’s top drilling companies.” Source: RevenueBase Database · checked Sep 20, 2026
11	Geoex MCG	Indirect evidence	Epsom, United KingdomHQ checked Sep 20, 2026	11-50	17 contacts →
	Indirect evidence “We are a multi-disciplinary team of experts in geoscience, interpretation, operations and marketing with an intimate knowledge of the energy industry.” Source: RevenueBase Database · checked Sep 20, 2026
12	IGS International Geoscience Services LTD	Indirect evidence	Bingham, United KingdomHQ checked Sep 20, 2026	1-10	15 contacts →
	Indirect evidence “IGS (International Geoscience Services) Ltd is a UK based, specialist consultancy supporting and promoting the mineral resource sector by collecting, quality control, defining…” Source: RevenueBase Database · checked Sep 20, 2026
13	Geoscience Limited	Partial evidence	Falmouth, United KingdomHQ checked Sep 20, 2026	11-50	14 contacts →
	Partial evidence “GeoScience Limited is an independent earth science consultancy, providing engineering, geomechanics and reservoir geology solutions to the oil, gas and geothermal industries.” Source: RevenueBase Database · checked Sep 20, 2026
14	Geothermal Engineering LTD	Partial evidence	Redruth, United KingdomHQ checked Sep 20, 2026	1-10	14 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 20, 2026
15	Townrock Energy	Partial evidence	Edinburgh City, United KingdomHQ checked Sep 20, 2026	11-50	14 contacts →
	Partial evidence “We are an award-winning geothermal company based in Edinburgh, Scotland and a leading specialist in all aspects of the UK’s geothermal resources.” Source: RevenueBase Database · checked Sep 20, 2026
16	Synergy Boreholes LTD	Partial evidence	Aylesbury, United KingdomHQ checked Sep 20, 2026	11-50	14 contacts →
	Partial evidence “We specialise in Geothermal Ground Source Boreholes and Water Boreholes up to 300m.” Source: RevenueBase Database · checked Sep 20, 2026
17	Neftex Predictions	Indirect evidence	Abingdon, United KingdomHQ checked Sep 20, 2026	51-200	12 contacts →
	Indirect evidence “The Neftex® Predictions portfolio from Halliburton Landmark delivers an unparalleled global view of Earth’s tectonostratigraphic history and associated resource potential.” Source: RevenueBase Database · checked Sep 20, 2026
18	Rockwave	Indirect evidence	Oxford-cambridge Technology Arc, United KingdomHQ checked Sep 20, 2026	1-10	10 contacts →
	Indirect evidence “You deserve a better experience from your next seismic project.” Source: RevenueBase Database · checked Sep 20, 2026
19	Erda Energy	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	9 contacts →
	Indirect evidence “Smart, sustainable heating and cooling, powered by the earth.” Source: RevenueBase Database · checked Sep 20, 2026
20	Eden Geothermal Limited	Partial evidence	Cornwall, United KingdomHQ checked Sep 20, 2026	11-50	7 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 20, 2026
21	Western Gold Exploration Limited	Partial evidence	North Berwick, United KingdomHQ checked Sep 20, 2026	1-10	7 contacts →
	Partial evidence “Western Gold Exploration Limited is exploring Scotland for Gold, Copper, and critical minerals across its Lorne Porphyry and Calendonian Gold Projects.” Source: RevenueBase Database · checked Sep 20, 2026
22	h2au.co	Partial evidence	Epsom, United KingdomHQ checked Sep 20, 2026	1-10	7 contacts →
	Partial evidence “Founded in 2022, H2Au is leading the way in natural hydrogen exploration and production (E&P), combining proven exploration techniques and unique play-based models to identify…” Source: RevenueBase Database · checked Sep 20, 2026
23	Sunda Energy PLC	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	7 contacts →
	Indirect evidence “Sunda Energy is an independent gas-focused company.” Source: RevenueBase Database · checked Sep 20, 2026
24	Addison Mining Services	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	6 contacts →
	Indirect evidence “At Addison Mining Services Ltd we pride ourselves on delivering high quality mining solutions to the global mineral industry.” Source: RevenueBase Database · checked Sep 20, 2026
25	Weardale Lithium	Partial evidence	Weardale, United KingdomHQ checked Sep 20, 2026	11-50	6 contacts →
	Partial evidence “Weardale Lithium limited is a natural resources exploration and development company.” Source: RevenueBase Database · checked Sep 20, 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: geothermal exploration companies. 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 geothermal exploration companies.
Partial evidence: Its own public description names part of geothermal exploration companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal exploration companies. 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 150 geothermal exploration companies based in the United Kingdom

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Geothermal exploration companies based in the United Kingdom at a glance

As of Sep 20, 2026

19.7%Verified-email coverage

15.2Average contacts per company

1-10Median size (employees)

24.0%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 150 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 geothermal exploration companies, 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 “geothermal exploration companies”. 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 geothermal exploration companies), 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 geothermal exploration companies, 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, 448 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 20, 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.

Geothermal exploration companies by metro

Geothermal exploration companies in London36

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 geothermal exploration companies, 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 geothermal exploration companies are there based in the United Kingdom?

RevenueBase identified 150 geothermal exploration companies 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?

EPI Group, headquartered in Fleet, tops this list with the largest team on record.

Which city has the most geothermal exploration companies?

London leads with 36 headquartered companies, followed by Aberdeen (5) and Edinburgh (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 448 verified decision-maker contacts tracked across these 150 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 20, 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 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.