Company lists · Data refreshed September 2026

Top 25 Geothermal reservoir engineering firms based in the United Kingdom

Name: Geothermal reservoir engineering 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 16, 2026 140 companies tracked

RevenueBase identified 140 geothermal reservoir engineering firms headquartered in the United Kingdom as of September 2026 and tracks 731 professional contacts across them, including 283 with verified work emails. London is the largest hub.

This list covers geothermal reservoir engineering 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 16, 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 16, 2026 86% judged on-target in blind review

140Companies

731Contacts tracked

283Verified emails

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

Ranked by team size

Top 25 of 140 geothermal reservoir engineering firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal reservoir engineering 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	Star Energy Group PLC	Indirect evidence	Sudbrooke, United KingdomHQ checked Sep 16, 2026	51-200	83 contacts →
	Indirect evidence “Star Energy Group plc is a British energy business.” Source: RevenueBase Database · checked Sep 16, 2026
2	Zetica Limited	Partial evidence	Eynsham, United KingdomHQ checked Sep 16, 2026	51-200	75 contacts →
	Partial 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 16, 2026
3	Omnia Projects	Partial evidence	Northallerton, United KingdomHQ checked Sep 16, 2026	51-200	68 contacts →
	Partial evidence “Omnia Projects are an Engineering Consultancy providing multidisciplinary expertise for energy projects providing a complete service from feasibility and concept development…” Source: RevenueBase Database · checked Sep 16, 2026
4	Geothermal Development Company	Partial evidence	Great Yarmouth, United KingdomHQ checked Sep 16, 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 16, 2026
5	Hydenlyne	Indirect evidence	Wimborne Minster, United KingdomHQ checked Sep 16, 2026	1-10	25 contacts →
	Indirect evidence “Hydenlyne is a privately owned consultancy, based in Dorset, UK, providing technical consultants globally across the offshore and onshore sectors.” Source: RevenueBase Database · checked Sep 16, 2026
6	Drilcorp	Indirect evidence	Seaham, United KingdomHQ checked Sep 16, 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 16, 2026
7	Stillwater Associates LTD	Strong evidence	Reigate, United KingdomHQ checked Sep 16, 2026	11-50	16 contacts →
	Strong evidence “Stillwater Associates is dedicated to reservoir safety and water engineering services.” Source: RevenueBase Database · checked Sep 16, 2026
8	Geoscience Limited	Strong evidence	Falmouth, United KingdomHQ checked Sep 16, 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 16, 2026
9	Geothermal Engineering LTD	Partial evidence	Redruth, United KingdomHQ checked Sep 16, 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 16, 2026
10	Townrock Energy	Partial evidence	Edinburgh City, United KingdomHQ checked Sep 16, 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 16, 2026
11	Synergy Boreholes LTD	Partial evidence	Aylesbury, United KingdomHQ checked Sep 16, 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 16, 2026
12	Renewables First LTD	Indirect evidence	Stroud, United KingdomHQ checked Sep 16, 2026	11-50	9 contacts →
	Indirect evidence “UK leader in hydropower consultancy, environmental licensing, detailed design and specification, project management and installation.” Source: RevenueBase Database · checked Sep 16, 2026
13	Seismic Image Processing LTD	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 16, 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 16, 2026
14	Opengosim LTD	Partial evidence	Taunton, United KingdomHQ checked Sep 16, 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 16, 2026
15	Erda Energy	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	9 contacts →
	Indirect evidence “Smart, sustainable heating and cooling, powered by the earth.” Source: RevenueBase Database · checked Sep 16, 2026
16	Merlin Energy Resources Limited	Partial evidence	Ledbury, United KingdomHQ checked Sep 16, 2026	11-50	8 contacts →
	Partial evidence “Merlin Energy Resources is an employee-owned geoscience, engineering and data consultancy formed in 1998.” Source: RevenueBase Database · checked Sep 16, 2026
17	Ants Group LTD	Indirect evidence	Kempston, United KingdomHQ checked Sep 16, 2026	11-50	8 contacts →
	Indirect evidence “ANTS Group are a leading supplier of Renewables, Civils, Drilling and Environmental services.” Source: RevenueBase Database · checked Sep 16, 2026
18	East Point GEO	Indirect evidence	Norwich, United KingdomHQ checked Sep 16, 2026	11-50	6 contacts →
	Indirect evidence “Independent geoconsulting for onshore and offshore projects.” Source: RevenueBase Database · checked Sep 16, 2026
19	Black Reiver Consulting	Indirect evidence	Donkleywood, United KingdomHQ checked Sep 16, 2026	1-10	5 contacts →
	Indirect evidence “Black Reiver Consulting, an independent training provider and management consultancy for the drilling industry, prides itself on its close collaboration with energy-related…” Source: RevenueBase Database · checked Sep 16, 2026
20	Dcarbonx	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	5 contacts →
	Indirect evidence “dCarbonX is a pioneering asset-focused GeoEnergy company established to develop subsurface assets for energy storage and for the sequestration of CO2.” Source: RevenueBase Database · checked Sep 16, 2026
21	MSA Mining Consulting UK	Indirect evidence	Cardiff, United KingdomHQ checked Sep 16, 2026	1-10	5 contacts →
	Indirect evidence “MSA Mining Consulting UK Ltd is part of the larger MSA Group, an independent technical consultancy providing high quality geology, exploration, mineral resource, mining and…” Source: RevenueBase Database · checked Sep 16, 2026
22	Terra Firma Ground Investigation LTD	Strong evidence	Ley Hill, United KingdomHQ checked Sep 16, 2026	11-50	5 contacts →
	Strong evidence “Ground Investigation, Geotechnical Design Advice, Geothermal Energy, Water Abstraction, Expert Opinion, Knowledge and Training – TFGI provide the essential Ground Engineering…” Source: RevenueBase Database · checked Sep 16, 2026
23	Primeval Energy LTD	Partial evidence	Cambridge, United KingdomHQ checked Sep 16, 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 16, 2026
24	Jackson Drilling Holdings Limited	Indirect evidence	Shepton Mallet, United KingdomHQ checked Sep 16, 2026	1-10	4 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026
25	Consortium Drilling LTD	Indirect evidence	Sheffield, United KingdomHQ checked Sep 16, 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 16, 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 engineering 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 engineering firms.
Partial evidence: Its own public description names part of geothermal reservoir engineering 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 engineering 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 140 geothermal reservoir engineering firms based in the United Kingdom

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

As of Sep 16, 2026

38.7%Verified-email coverage

5.2Average contacts per company

1-10Median size (employees)

16.4%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

100

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 140 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 engineering 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 engineering 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 engineering 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 engineering 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, 283 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 16, 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 engineering 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 engineering firms are there based in the United Kingdom?

RevenueBase identified 140 geothermal reservoir engineering 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?

Star Energy Group PLC, headquartered in Lincoln, tops this list with the largest team on record.

Which city has the most geothermal reservoir engineering firms?

London leads with 23 headquartered companies, followed by Aberdeen (14) and Edinburgh (4).

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 283 verified decision-maker contacts tracked across these 140 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 16, 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.