Company lists · Data refreshed September 2026

Top 25 Power systems maintenance based in the United Kingdom

Name: Power systems maintenance 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 389 companies tracked

RevenueBase identified 389 power systems maintenance headquartered in the United Kingdom as of September 2026 and tracks 6,417 professional contacts across them, including 1,856 with verified work emails. London is the largest hub.

This list covers power systems maintenance 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

389Companies

6,417Contacts tracked

1,856Verified emails

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The 25 largest power systems maintenance based in the United Kingdom

Ranked by team size

Top 25 of 389 power systems maintenance 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 power systems maintenance: 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 20, 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 20, 2026
2	Quartzelec Limited	Indirect evidence	Rugby, United KingdomHQ checked Sep 20, 2026	501-1,000	412 contacts →
	Indirect evidence “Quartzelec is a leading independent electrical engineering group delivering solutions and services in both UK and global markets.” Source: RevenueBase Database · checked Sep 20, 2026
3	Brush Group	Partial evidence	Loughborough, United KingdomHQ checked Sep 20, 2026	501-1,000	367 contacts →
	Partial evidence “We support the global drive to net zero with innovative, engineered solutions that address grid resilience and systems challenges, facilitate electrification of transport and…” Source: RevenueBase Database · checked Sep 20, 2026
4	Dale Power Solutions	Strong evidence	Scarborough, United KingdomHQ checked Sep 20, 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 20, 2026
5	WB Power Services LTD	Partial evidence	Heanor, United KingdomHQ checked Sep 20, 2026	51-200	168 contacts →
	Partial 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 20, 2026
6	Excalon LTD	Indirect evidence	Salford, United KingdomHQ checked Sep 20, 2026	201-500	108 contacts →
	Indirect evidence “Excalon is one of the Britain’s leading UK Electrical Utility Service Providers.” Source: RevenueBase Database · checked Sep 20, 2026
7	Rock Power Connections LTD	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 20, 2026	51-200	105 contacts →
	Partial evidence “Rock Power Connections are experts in electrical connections with a proven track record of quality and safety.” Source: RevenueBase Database · checked Sep 20, 2026
8	AUS LTD	Indirect evidence	Clayton West, United KingdomHQ checked Sep 20, 2026	51-200	63 contacts →
	Indirect evidence “AUS is a specialist supplier to the electricity distribution and transmission, rail, utility arboricultural, and telecommunications industries.” Source: RevenueBase Database · checked Sep 20, 2026
9	Avidety	Partial evidence	Sittingbourne, United KingdomHQ checked Sep 20, 2026	51-200	56 contacts →
	Partial evidence “Avidety specialise in the construction and maintenance of overhead and underground electricity networks.” Source: RevenueBase Database · checked Sep 20, 2026
10	Mems Power Generation	Partial evidence	Gillingham, United KingdomHQ checked Sep 20, 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 20, 2026
11	The Wiggett Group LTD	Indirect evidence	Brentwood, United KingdomHQ checked Sep 20, 2026	201-500	51 contacts →
	Indirect evidence “Wiggett Electrical has gone from strength to strength.” Source: RevenueBase Database · checked Sep 20, 2026
12	Lloyd Morris Electrical LTD	Partial evidence	Wrexham, United KingdomHQ checked Sep 20, 2026	51-200	47 contacts →
	Partial evidence “Lloyd Morris Electrical Limited is a company of Electrical Engineers, specialising in the design, manufacture and installation of Electrical Distribution and Control Systems for…” Source: RevenueBase Database · checked Sep 20, 2026
13	Acrastyle Limited	Indirect evidence	Ulverston, United KingdomHQ checked Sep 20, 2026	51-200	43 contacts →
	Indirect evidence “Acrastyle Limited (UK) is a resource-rich engineering company that designs, manufactures, tests, installs, commissions, and maintains high-voltage sub-station protection and…” Source: RevenueBase Database · checked Sep 20, 2026
14	Slaters Electricals	Partial evidence	Tollbridge Road, United KingdomHQ checked Sep 20, 2026	51-200	42 contacts →
	Partial evidence “Established for over 100 years, Slaters Electricals Ltd are experts in LV and HV power distribution equipment, installation and support solutions.” Source: RevenueBase Database · checked Sep 20, 2026
15	GES Group	Indirect evidence	Ballymena, United KingdomHQ checked Sep 20, 2026	51-200	38 contacts →
	Indirect evidence “Established over 40 years ago as Grants Electrical Services (NI) Ltd, we have grown into GES Group, a leading Electrical and Mechanical Engineering company, serving customers…” Source: RevenueBase Database · checked Sep 20, 2026
16	Burtonwood Generator & Switchgear Services LTD	Partial evidence	St Helens, United KingdomHQ checked Sep 20, 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 20, 2026
17	Fivefour Engineering Services	Partial evidence	Theale, United KingdomHQ checked Sep 20, 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 20, 2026
18	Central Power Services	Strong evidence	Preston, United KingdomHQ checked Sep 20, 2026	11-50	30 contacts →
	Strong evidence “Central Power Services is one of the UK’s most trusted independent power specialists, delivering 24/7 generator hire, sales, and maintenance solutions nationwide.” Source: RevenueBase Database · checked Sep 20, 2026
19	Industrial Switchgear Services LTD	Partial evidence	Hyde, United KingdomHQ checked Sep 20, 2026	51-200	30 contacts →
	Partial evidence “ISS Ltd are a HV/LV Power Engineering company operating nationwide, undertaking Turnkey Electrical Distribution Projects and Site Service activities, including installation…” Source: RevenueBase Database · checked Sep 20, 2026
20	JJ Loughran	Indirect evidence	Co.tyrone, United KingdomHQ checked Sep 20, 2026	51-200	30 contacts →
	Indirect evidence “JJ Loughran is an Electrical Engineering & Supply Company based in Cookstown N.Ireland.” Source: RevenueBase Database · checked Sep 20, 2026
21	Rosh Engineering LTD	Partial evidence	Blaydon On Tyne, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Partial evidence “Power transformer repair, refurbishment, supply & installation and enhancement throughout the UK and northern Europe.” Source: RevenueBase Database · checked Sep 20, 2026
22	Project Power	Partial evidence	Crumlin, United KingdomHQ checked Sep 20, 2026	11-50	27 contacts →
	Partial evidence “At Project Power we pride ourselves on our quality of equipment, high level of service and teamwork ethos – all of which is at the heart of everything we do – we call this our…” Source: RevenueBase Database · checked Sep 20, 2026
23	Firstfield Electrical LTD	Partial evidence	Ipswich, United KingdomHQ checked Sep 20, 2026	11-50	26 contacts →
	Partial evidence “Firstfield Electrical Ltd are specialists in large-scale industrial and commercial electrical installations, control systems, inspections and domestic works.” Source: RevenueBase Database · checked Sep 20, 2026
24	Instrument & Control Services ICS LTD	Partial evidence	Stoke On Trent, United KingdomHQ checked Sep 20, 2026	51-200	26 contacts →
	Partial evidence “At ICS, part of United Infrastructure Group, we power the future with innovative, high-voltage electrical solutions.” Source: RevenueBase Database · checked Sep 20, 2026
25	Pleavin Power	Indirect evidence	Wirral, United KingdomHQ checked Sep 20, 2026	11-50	25 contacts →
	Indirect evidence “Delivering on our promise to be a reliable, effective and powerful solution for your business.” 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: power systems maintenance. 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 power systems maintenance.
Partial evidence: Its own public description names part of power systems maintenance, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name power systems maintenance. 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 389 power systems maintenance based in the United Kingdom

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Power systems maintenance based in the United Kingdom at a glance

As of Sep 20, 2026

28.9%Verified-email coverage

16.5Average contacts per company

1-10Median size (employees)

4.9%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

211

11-50

128

51-200

201-500

501-1,000

1,001-5,000

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 389 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 power systems maintenance, 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 “power systems maintenance”. 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 power systems maintenance), 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 power systems maintenance, 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, 1,856 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.

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 power systems maintenance, 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 power systems maintenance are there based in the United Kingdom?

RevenueBase identified 389 power systems maintenance 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 power systems maintenance?

London leads with 19 headquartered companies, followed by Manchester (12) and Leeds (7).

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 1,856 verified decision-maker contacts tracked across these 389 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.