Company lists · Data refreshed September 2026

Top 25 Geothermal reservoir assessment firms based in the United Kingdom

Name: Geothermal reservoir assessment 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 19, 2026 109 companies tracked

RevenueBase identified 109 geothermal reservoir assessment firms headquartered in the United Kingdom as of September 2026 and tracks 787 professional contacts across them, including 323 with verified work emails. London is the largest hub.

This list covers geothermal reservoir assessment 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 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 19, 2026 86% judged on-target in blind review

109Companies

787Contacts tracked

323Verified emails

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The 25 largest geothermal reservoir assessment firms based in the United Kingdom

Ranked by team size

Top 25 of 109 geothermal reservoir assessment firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal reservoir assessment firms: 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 19, 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 19, 2026
2	Star Energy Group PLC	Indirect evidence	Sudbrooke, United KingdomHQ checked Sep 19, 2026	51-200	83 contacts →
	Indirect evidence “Star Energy Group plc is a British energy business.” Source: RevenueBase Database · checked Sep 19, 2026
3	Getech	Indirect evidence	Leeds, United KingdomHQ checked Sep 19, 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 19, 2026
4	Zetica Limited	Indirect evidence	Eynsham, United KingdomHQ checked Sep 19, 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 19, 2026
5	Stryde	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	59 contacts →
	Indirect evidence “STRYDE is a leading onshore subsurface imaging solutions provider, revolutionising land seismic acquisition and data processing through ultra-lightweight, low-cost recording…” Source: RevenueBase Database · checked Sep 19, 2026
6	Geothermal Development Company	Partial evidence	Great Yarmouth, United KingdomHQ checked Sep 19, 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 19, 2026
7	Terradat UK LTD	Indirect evidence	Cardiff, United KingdomHQ checked Sep 19, 2026	11-50	21 contacts →
	Indirect evidence “Complex Geophysics delivered by Down to Earth people: 33 years' experience working with engineers & consultants delivering honest, reliable and objective subsurface mapping…” Source: RevenueBase Database · checked Sep 19, 2026
8	Geoex MCG	Indirect evidence	Epsom, United KingdomHQ checked Sep 19, 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 19, 2026
9	Geoscience Limited	Strong evidence	Falmouth, United KingdomHQ checked Sep 19, 2026	11-50	14 contacts →
	Strong 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 19, 2026
10	Townrock Energy	Partial evidence	Edinburgh City, United KingdomHQ checked Sep 19, 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 19, 2026
11	Synergy Boreholes LTD	Partial evidence	Aylesbury, United KingdomHQ checked Sep 19, 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 19, 2026
12	Rockwave	Indirect evidence	Oxford-cambridge Technology Arc, United KingdomHQ checked Sep 19, 2026	1-10	10 contacts →
	Indirect evidence “You deserve a better experience from your next seismic project.” Source: RevenueBase Database · checked Sep 19, 2026
13	Seismic Image Processing LTD	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 19, 2026	11-50	9 contacts →
	Indirect evidence “Seismic Image Processing is a premier provider of bespoke seismic image solutions, with offices in Aberdeen and Guildford.” Source: RevenueBase Database · checked Sep 19, 2026
14	Opengosim LTD	Partial evidence	Taunton, United KingdomHQ checked Sep 19, 2026	11-50	9 contacts →
	Partial evidence “OpenGoSim (OGS) develops and supports Cirrus (formerly known as PFLOTRAN-OGS), a reservoir simulator dedicated to CO2 Geological Storage.” Source: RevenueBase Database · checked Sep 19, 2026
15	Geothermal Energy Forum	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	8 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 19, 2026
16	Adrok LTD	Indirect evidence	Of Edinburgh, United KingdomHQ checked Sep 19, 2026	11-50	4 contacts →
	Indirect evidence “Adrok is passionate about helping to make the world a better place by helping to better understand what lies beneath the earth creating virtual boreholes – therefore realising…” Source: RevenueBase Database · checked Sep 19, 2026
17	Primeval Energy LTD	Partial evidence	Cambridge, United KingdomHQ checked Sep 19, 2026	1-10	4 contacts →
	Partial evidence “Primeval Energy is a geothermal solutions company, newly established by seasoned oil and gas, geothermal, finance and commercial professionals.” Source: RevenueBase Database · checked Sep 19, 2026
18	Core Specialist Services Limited	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 19, 2026	1-10	4 contacts →
	Indirect evidence “Covering all aspects of Core based data acquisition, Core Specialist Services principal areas of expertise are project management related to: •Coring – planning to core and…” Source: RevenueBase Database · checked Sep 19, 2026
19	Consortium Drilling LTD	Indirect evidence	Sheffield, United KingdomHQ checked Sep 19, 2026	51-200	4 contacts →
	Indirect evidence “Consortium Drilling is a leading onshore deep drilling contractor based in the heart of the UK.” Source: RevenueBase Database · checked Sep 19, 2026
20	Cambridge Carbonates LTD	Partial evidence	Solihull, United KingdomHQ checked Sep 19, 2026	1-10	4 contacts →
	Partial evidence “We are a geological consultancy that provides expertise in carbonate and evaporite systems primarily to the oil, gas and geothermal industry, and also to mineral extraction and…” Source: RevenueBase Database · checked Sep 19, 2026
21	Zegen Energy	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 19, 2026	1-10	3 contacts →
	Indirect evidence “In a world that is looking for clean, reliable, and renewable energy solutions, ZeGen Energy has developed a model to effectively identify potential heat and power production by…” Source: RevenueBase Database · checked Sep 19, 2026
22	RGC LTD	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 19, 2026	1-10	3 contacts →
	Indirect evidence “We believe energy should be clean, affordable, reliable and divided equally.” Source: RevenueBase Database · checked Sep 19, 2026
23	Aquifer Energy	Indirect evidence	Leicestershire, United KingdomHQ checked Sep 19, 2026	1-10	3 contacts →
	Indirect evidence “Aquifer Energy is a specialist consultant offering a full range of services for Open & Closed loop Ground Source Heating Projects.” Source: RevenueBase Database · checked Sep 19, 2026
24	GEO Energy Holding	Partial evidence	Cheshire, United KingdomHQ checked Sep 19, 2026	11-50	2 contacts →
	Partial evidence “Geo Energy Holding is a UK based global renewable energy holding with the vision of utilizing each droplet of geothermal brine and steam, maximizing power generation efficiencies…” Source: RevenueBase Database · checked Sep 19, 2026
25	Barnwell Parker Geoscience LTD	Indirect evidence	Conway, United KingdomHQ checked Sep 19, 2026	1-10	2 contacts →
	Indirect evidence “Geological & Geophysical consultancy to the Oil and Gas Industry” Source: RevenueBase Database · checked Sep 19, 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 reservoir assessment firms. 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 reservoir assessment firms.
Partial evidence: Its own public description names part of geothermal reservoir assessment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal reservoir assessment firms. 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 109 geothermal reservoir assessment firms based in the United Kingdom

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Geothermal reservoir assessment firms based in the United Kingdom at a glance

As of Sep 19, 2026

41.0%Verified-email coverage

7.2Average contacts per company

1-10Median size (employees)

16.5%Largest-city concentration · London

Sep 19, 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 109 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 reservoir assessment firms, 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 reservoir assessment firms”. 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 reservoir assessment firms), 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 reservoir assessment 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 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, 323 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 19, 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.

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 reservoir assessment firms, 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 reservoir assessment firms are there based in the United Kingdom?

RevenueBase identified 109 geothermal reservoir assessment 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?

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

Which city has the most geothermal reservoir assessment firms?

London leads with 18 headquartered companies, followed by Aberdeen (13) 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 323 verified decision-maker contacts tracked across these 109 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 19, 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.