Company lists · Data refreshed September 2026

Top 25 Critical power infrastructure companies based in the United Kingdom

Name: Critical power infrastructure 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 19, 2026 311 companies tracked

RevenueBase identified 311 critical power infrastructure companies headquartered in the United Kingdom as of September 2026 and tracks 5,127 professional contacts across them, including 2,161 with verified work emails. London is the largest hub.

This list covers critical power infrastructure 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 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

311Companies

5,127Contacts tracked

2,161Verified emails

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The 25 largest critical power infrastructure companies based in the United Kingdom

Ranked by team size

Top 25 of 311 critical power infrastructure companies 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 critical power infrastructure 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	Freedom	Partial evidence	Leeds, United KingdomHQ checked Sep 19, 2026	1,001-5,000	664 contacts →
	Partial evidence “Freedom is a leading provider of facilities and power engineering services.” Source: RevenueBase Database · checked Sep 19, 2026
2	Avk-Seg	Strong evidence	Maidenhead, United KingdomHQ checked Sep 19, 2026	201-500	272 contacts →
	Strong evidence “AVK is the largest and fastest-growing supplier of innovative power solutions for data centres, AI infrastructure and leading organisations in the UK and Europe.” Source: RevenueBase Database · checked Sep 19, 2026
3	Dale Power Solutions	Strong evidence	Scarborough, United KingdomHQ checked Sep 19, 2026	201-500	214 contacts →
	Strong evidence “Founded in 1935 Dale Power Solutions Ltd have been providing reliable; secure power solutions for mission critical services & systems throughout the world.” Source: RevenueBase Database · checked Sep 19, 2026
4	WB Power Services LTD	Strong evidence	Heanor, United KingdomHQ checked Sep 19, 2026	51-200	168 contacts →
	Strong evidence “WB Power Services Ltd (now proudly part of Rehlko) provide critical power services to some of the UK’s most important businesses and organisations, ensuring essential services are…” Source: RevenueBase Database · checked Sep 19, 2026
5	Finning Power & Energy	Partial evidence	Cannock, United KingdomHQ checked Sep 19, 2026	1,001-5,000	141 contacts →
	Partial evidence “Finning Power & Energy is a division of Finning, the sole dealer for Caterpillar in the UK & Ireland.” Source: RevenueBase Database · checked Sep 19, 2026
6	ADE Power	Partial evidence	Pontefract, United KingdomHQ checked Sep 19, 2026	201-500	125 contacts →
	Partial evidence “ADE Power have over 25 years of experience at the forefront of the design, manufacture, and fit-out of precision engineered acoustic and modular enclosures for the packaging of…” Source: RevenueBase Database · checked Sep 19, 2026
7	Integrated Utility Services	Strong evidence	Wakefield, United KingdomHQ checked Sep 19, 2026	51-200	121 contacts →
	Strong evidence “Integrated Utility Services (IUS) aims to be the UK's leading provider of power infrastructure for the public and private sectors.” Source: RevenueBase Database · checked Sep 19, 2026
8	Darke & Taylor LTD	Indirect evidence	Oxfordshire, United KingdomHQ checked Sep 19, 2026	51-200	112 contacts →
	Indirect evidence “Our mission is to excel in the design, installation and maintenance of the electro-technical systems that connect to create fit for purpose building environments.” Source: RevenueBase Database · checked Sep 19, 2026
9	Power Control LTD	Partial evidence	Eckington, United KingdomHQ checked Sep 19, 2026	51-200	97 contacts →
	Partial evidence “Power Control Ltd is now proudly part of Legrand, a leading European manufacturer of innovative, reliable, and efficient UPS systems.” Source: RevenueBase Database · checked Sep 19, 2026
10	Riello UPS LTD	Partial evidence	Wrexham, United KingdomHQ checked Sep 19, 2026	51-200	95 contacts →
	Partial evidence “Riello UPS Ltd is a leader in the manufacture of uninterruptible power supplies (UPS) from 400 VA to 6.4 MVA and standby generators from 8 kVA to 2.5 MVA.” Source: RevenueBase Database · checked Sep 19, 2026
11	Yorpower	Indirect evidence	Sherburn In Elmet, United KingdomHQ checked Sep 19, 2026	51-200	93 contacts →
	Indirect evidence “YorPower are multi award winning company with their head office based in the UK.” Source: RevenueBase Database · checked Sep 19, 2026
12	Shenton Group	Partial evidence	Andover, United KingdomHQ checked Sep 19, 2026	51-200	85 contacts →
	Partial evidence “The UK's leading Technical Experts in Standby Power, Uninterruptible Power Supplies and Combined Heat & Power Systems.” Source: RevenueBase Database · checked Sep 19, 2026
13	Highview	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	79 contacts →
	Partial evidence “Highview is a leading energy infrastructure business.” Source: RevenueBase Database · checked Sep 19, 2026
14	DTGEN	Partial evidence	Milngavie, United KingdomHQ checked Sep 19, 2026	51-200	79 contacts →
	Partial evidence “From our 6.3-acre HQ in Glasgow, and further sites in Bristol and Rugby, we supply, install and maintain diesel and gas generators, combined heat and power systems (CHP), solar…” Source: RevenueBase Database · checked Sep 19, 2026
15	Esmart Networks	Partial evidence	Braintree, United KingdomHQ checked Sep 19, 2026	51-200	75 contacts →
	Partial evidence “Securing your power needs to deliver your electrification plans with certainty.” Source: RevenueBase Database · checked Sep 19, 2026
16	Mems Power Generation	Partial evidence	Gillingham, United KingdomHQ checked Sep 19, 2026	51-200	56 contacts →
	Partial evidence “MEMS Power Generation is the UK leader in generator hire, approaching our 50th year of delivering temporary power solutions that businesses can depend on.” Source: RevenueBase Database · checked Sep 19, 2026
17	UPS Systems PLC	Partial evidence	Swindon, United KingdomHQ checked Sep 19, 2026	11-50	51 contacts →
	Partial evidence “UPS Systems PLC are the UK’s leading independent supplier of standby power and occupy a unique position in the provision of back-up power solutions to businesses of all sizes.” Source: RevenueBase Database · checked Sep 19, 2026
18	ENRGY	Strong evidence	Crewe, United KingdomHQ checked Sep 19, 2026	11-50	51 contacts →
	Strong evidence “Enrgy provide utility scale power infrastructure services up to 33KV for private generation customers.” Source: RevenueBase Database · checked Sep 19, 2026
19	Durata	Strong evidence	Middlesbrough, United KingdomHQ checked Sep 19, 2026	11-50	47 contacts →
	Strong evidence “Durata is the trusted partner your business needs for critical power, legacy optimisation and modular data centre solutions.” Source: RevenueBase Database · checked Sep 19, 2026
20	Burtonwood Generator & Switchgear Services LTD	Partial evidence	St Helens, United KingdomHQ checked Sep 19, 2026	11-50	38 contacts →
	Partial evidence “Burtonwood provide a comprehensive range of power generation and switchgear services to the MOD, public and private sectors both in the UK and Europe.” Source: RevenueBase Database · checked Sep 19, 2026
21	Energy Solutions UK LTD	Partial evidence	Aylesford, United KingdomHQ checked Sep 19, 2026	51-200	37 contacts →
	Partial evidence “Energy Solutions (UK) Ltd designs, manufactures and supplies integrated power, monitoring and control systems for marine, specialist vehicle, off‑grid and industrial applications…” Source: RevenueBase Database · checked Sep 19, 2026
22	JN Civils	Strong evidence	Preston, United KingdomHQ checked Sep 19, 2026	51-200	36 contacts →
	Strong evidence “A trusted provider, we deliver infrastructure services to the owners and operators of critical infrastructure that helps ensure the safe and reliable operation of utility assets…” Source: RevenueBase Database · checked Sep 19, 2026
23	BPC Energy LTD	Partial evidence	Romsey, United KingdomHQ checked Sep 19, 2026	11-50	35 contacts →
	Partial evidence “BPC manufacture and distribute a wide range of UPS and related power protection products aimed at the Computer Networking, Telecom, Midrange Computer, Emergency Lighting and Three…” Source: RevenueBase Database · checked Sep 19, 2026
24	Fivefour Engineering Services	Partial evidence	Theale, United KingdomHQ checked Sep 19, 2026	51-200	35 contacts →
	Partial evidence “FiveFour Engineering Service work within the United Kingdom, Central Europe and Scandinavia for clients that have power requirements in either traditional methods of new build or…” Source: RevenueBase Database · checked Sep 19, 2026
25	Secure Power	Partial evidence	Sheffield, United KingdomHQ checked Sep 19, 2026	11-50	31 contacts →
	Partial evidence “Secure Power is a leading provider of backup power solutions, ensuring reliability and efficiency for businesses across many sectors.” 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: critical power infrastructure 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 critical power infrastructure companies.
Partial evidence: Its own public description names part of critical power infrastructure companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name critical power infrastructure 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 311 critical power infrastructure companies based in the United Kingdom

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Critical power infrastructure companies based in the United Kingdom at a glance

As of Sep 19, 2026

42.1%Verified-email coverage

16.5Average contacts per company

11-50Median size (employees)

7.4%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

125

11-50

130

51-200

201-500

501-1,000

1,001-5,000

10001+

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 311 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 critical power infrastructure 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 “critical power infrastructure 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 critical power infrastructure 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 critical power infrastructure 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, 2,161 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 critical power infrastructure 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 critical power infrastructure companies are there based in the United Kingdom?

RevenueBase identified 311 critical power infrastructure 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?

Freedom, headquartered in Leeds, tops this list with the largest team on record.

Which city has the most critical power infrastructure companies?

London leads with 23 headquartered companies, followed by Leeds (7) and Manchester (6).

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 2,161 verified decision-maker contacts tracked across these 311 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.