Company lists · Data refreshed September 2026

Top 25 Energy sector IT consultants based in London, United Kingdom

Name: Energy sector IT consultants based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 650 companies tracked

RevenueBase identified 650 energy sector IT consultants headquartered in London, United Kingdom as of September 2026 and tracks 11,931 professional contacts across them, including 4,453 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers energy sector IT consultants headquartered in London, 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 28, 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 28, 2026 86% judged on-target in blind review

650Companies

11,931Contacts tracked

4,453Verified emails

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The 25 largest energy sector IT consultants based in London, United Kingdom

Ranked by team size

Top 25 of 650 energy sector IT consultants based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to energy sector IT consultants: 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	Faithful Gould	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	1,194 contacts →
	Indirect evidence “Faithful+Gould is now AtkinsRéalis.” Source: RevenueBase Database · checked Sep 28, 2026
2	Dalkia UK	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	5,001-10,000	1,064 contacts →
	Partial evidence “Together, we’re delivering technical solutions for a better society and an Electric Britain Dalkia is one of the UK’s leading technical and energy services providers at the…” Source: RevenueBase Database · checked Sep 28, 2026
3	Penspen	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	1,007 contacts →
	Partial evidence “Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
4	Alten LTD - UK	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	529 contacts →
	Strong evidence “We are a leading Engineering and IT consultancy operating across all sectors in 30 different countries.” Source: RevenueBase Database · checked Sep 28, 2026
5	Genesis	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	501-1,000	401 contacts →
	Partial evidence “Genesis is a market-leading advisory company focused on providing high-value technical and advisory services for the energy industry.” Source: RevenueBase Database · checked Sep 28, 2026
6	Softwire	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	360 contacts →
	Indirect evidence “Softwire exists to help organisations use technology to deliver meaningful outcomes and a positive impact for themselves, their users and the world.” Source: RevenueBase Database · checked Sep 28, 2026
7	Flat Rock Technology	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	231 contacts →
	Indirect evidence “Since 2008, Flat Rock Technology, a software engineering, SI, Cloud DevOps, Cyber Security, and Customer Experience (CX) company, has been at the forefront of providing innovative…” Source: RevenueBase Database · checked Sep 28, 2026
8	OWC	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	185 contacts →
	Strong evidence “The Renewable Energy Consultants.” Source: RevenueBase Database · checked Sep 28, 2026
9	Brook Green Supply	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	183 contacts →
	Partial evidence “As a trusted end-to-end partner in the energy space, Brook Green Supply delivers the insight and expertise our customers need to make informed decisions, transact energy with…” Source: RevenueBase Database · checked Sep 28, 2026
10	Petroplan	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	175 contacts →
	Strong evidence “Petroplan is the trusted global recruitment solutions partner for clients and professionals in the oil, gas and energy sector.” Source: RevenueBase Database · checked Sep 28, 2026
11	Wood Thilsted	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	175 contacts →
	Strong evidence “Wood Thilsted is a world-leading renewable energy engineering consultancy experienced and specialised in offshore wind.” Source: RevenueBase Database · checked Sep 28, 2026
12	Opticoreit	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	120 contacts →
	Strong evidence “OpticoreIT is an IT Consultancy founded in 2013 to bridge a gap in the market between the major IT services providers and the consultancy market.” Source: RevenueBase Database · checked Sep 28, 2026
13	Glue Reply	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	118 contacts →
	Strong evidence “WHO WE ARE Glue Reply is a business consultancy that strives to help its clients achieve their future potential by developing solutions that often for the first time align IT…” Source: RevenueBase Database · checked Sep 28, 2026
14	CTS Offshore & Marine	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	106 contacts →
	Partial evidence “CTS Offshore & Marine Ltd is an independent provider of engineering services tailored for energy and material markets.” Source: RevenueBase Database · checked Sep 28, 2026
15	Conosco	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	105 contacts →
	Indirect evidence “Cybersecurity specialists providing technology and telecoms solutions that gives you the leadership, experience and resilience you need to build and secure the future of work.” Source: RevenueBase Database · checked Sep 28, 2026
16	GER Consultancy	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	102 contacts →
	Partial evidence “GER Consultancy specialises in the selection and provision of qualified and experienced engineering and technical personnel to clients within the Steel, Power Generation and Oil &…” Source: RevenueBase Database · checked Sep 28, 2026
17	Oryxalign	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	99 contacts →
	Indirect evidence “OryxAlign creates true alignment that delivers the right outcomes for all.” Source: RevenueBase Database · checked Sep 28, 2026
18	Pangea	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	99 contacts →
	Indirect evidence “Pangea have supported our global clients for over 14 years.” Source: RevenueBase Database · checked Sep 28, 2026
19	IO Consulting	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	92 contacts →
	Partial evidence “io is a project architect and systems integrator dedicated to empowering the energy transition through innovative and independent consulting services across all Front-End Loading…” Source: RevenueBase Database · checked Sep 28, 2026
20	Alfa Energy An Edison Energy Company	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	88 contacts →
	Strong evidence “Alfa Energy Group (an Edison Energy company) is an international energy, sustainability and technology consultant partner with 200 employees over four international locations.” Source: RevenueBase Database · checked Sep 28, 2026
21	Constor Solutions	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	87 contacts →
	Indirect evidence “At Constor Solutions, we believe that technology is the backbone of a successful business.” Source: RevenueBase Database · checked Sep 28, 2026
22	Team Energy Resources LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	87 contacts →
	Partial evidence “Since 1987, we connect energy companies with specialist technical professionals, providing tailored workforce solutions to ensure the successful delivery of complex energy…” Source: RevenueBase Database · checked Sep 28, 2026
23	Baseel Partners	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	78 contacts →
	Partial evidence “We offer a broad portfolio of IT and consulting services covering Governance and Strategy, Cloud, Data, Cybersecurity, Infrastructure and Applications, Managed IT and Security.” Source: RevenueBase Database · checked Sep 28, 2026
24	ALDIA	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	73 contacts →
	Partial evidence “ALDIA is an international consulting firm specializing in IT & Engineering, dedicated to driving digital transformation and innovation.” Source: RevenueBase Database · checked Sep 28, 2026
25	ONE Search	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	70 contacts →
	Partial evidence “One Search is an executive search firm founded in 2006 and dedicated since inception to the infrastructure and energy transition asset class.” Source: RevenueBase Database · checked Sep 28, 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: energy sector IT consultants. 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 energy sector IT consultants.
Partial evidence: Its own public description names part of energy sector IT consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy sector IT consultants. 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 650 energy sector IT consultants based in London, United Kingdom

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Energy sector IT consultants based in London, United Kingdom at a glance

As of Sep 28, 2026

37.3%Verified-email coverage

18.4Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

372

11-50

188

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 650 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 energy sector IT consultants, 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 London, United Kingdom whose own description of what they do matches “energy sector IT consultants”. 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 energy sector IT consultants), 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 energy sector IT consultants, and records with no verified work email. Companies headquartered outside London 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, 4,453 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 28, 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.

Energy sector IT consultants by metro in the United Kingdom

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 energy sector IT consultants, 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 energy sector IT consultants are there based in London, United Kingdom?

RevenueBase identified 650 energy sector IT consultants headquartered in London, 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?

Faithful Gould, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most energy sector IT consultants?

London leads the United Kingdom with 650 headquartered companies, followed by Aberdeen (66) and Manchester (58).

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 4,453 verified decision-maker contacts tracked across these 650 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 28, 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.