Company lists · Data refreshed September 2026

Top 25 Power systems engineering companies based in the United Kingdom

Name: Power systems engineering 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 17, 2026 3,072 companies tracked

RevenueBase identified 3,072 power systems engineering companies headquartered in the United Kingdom as of September 2026 and tracks 28,206 professional contacts across them, including 8,745 with verified work emails. London is the largest hub.

This list covers power systems engineering 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 17, 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 17, 2026 86% judged on-target in blind review

3,072Companies

28,206Contacts tracked

8,745Verified emails

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The 25 largest power systems engineering companies based in the United Kingdom

Ranked by team size

Top 25 of 3,072 power systems engineering companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to power systems engineering 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	Kelly Group	Indirect evidence	Wembley, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,053 contacts →
	Indirect evidence “Established in 1985 to support the emerging UK cable television market, Kelly Group has diversified to meet the needs of our clients.” Source: RevenueBase Database · checked Sep 17, 2026
2	Penspen	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,007 contacts →
	Indirect evidence “Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
3	Freedom	Strong evidence	Leeds, United KingdomHQ checked Sep 17, 2026	1,001-5,000	664 contacts →
	Strong evidence “Freedom is a leading provider of facilities and power engineering services.” Source: RevenueBase Database · checked Sep 17, 2026
4	Balfour Beatty Kilpatrick	Strong evidence	Glasgow, United KingdomHQ checked Sep 17, 2026	1,001-5,000	456 contacts →
	Strong evidence “As a leading mechanical & electrical engineering provider, we design, install and maintain the complex systems and technologies that underpin the UK’s national infrastructure and…” Source: RevenueBase Database · checked Sep 17, 2026
5	Quartzelec Limited	Partial evidence	Rugby, United KingdomHQ checked Sep 17, 2026	501-1,000	412 contacts →
	Partial evidence “Quartzelec is a leading independent electrical engineering group delivering solutions and services in both UK and global markets.” Source: RevenueBase Database · checked Sep 17, 2026
6	Brush Group	Partial evidence	Loughborough, United KingdomHQ checked Sep 17, 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 17, 2026
7	SPL Powerlines Uk&i	Indirect evidence	Coatbridge, United KingdomHQ checked Sep 17, 2026	501-1,000	337 contacts →
	Indirect evidence “SPL Powerlines UK & I is a leading multi-disciplinary infrastructure specialist, offering end-to-end delivery across both rail and energy sectors with capabilities that set us…” Source: RevenueBase Database · checked Sep 17, 2026
8	Intec Energy Solutions	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	242 contacts →
	Strong evidence “INTEC Energy Solutions delivers best-in-class services in Engineering, Procurement, Construction (EPC), Battery Energy Storage Systems (BESS), Manufacturing, Project Development…” Source: RevenueBase Database · checked Sep 17, 2026
9	Dale Power Solutions	Strong evidence	Scarborough, United KingdomHQ checked Sep 17, 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 17, 2026
10	Actemium UK	Partial evidence	Birmingham, United KingdomHQ checked Sep 17, 2026	501-1,000	190 contacts →
	Partial evidence “At Actemium UK, we are expert electrical, automation and mechanical engineers delivering bespoke engineering solutions across industry, infrastructure and beyond.” Source: RevenueBase Database · checked Sep 17, 2026
11	IQA Elecnor	Indirect evidence	Glasgow, United KingdomHQ checked Sep 17, 2026	201-500	184 contacts →
	Indirect evidence “IQA lead the way in designing, building, maintaining, and upgrading electrical utility networks, telecommunication networks, EVCP and electrical infrastructure for both the public…” Source: RevenueBase Database · checked Sep 17, 2026
12	WB Power Services LTD	Partial evidence	Heanor, United KingdomHQ checked Sep 17, 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 17, 2026
13	Drive System Design	Partial evidence	Leamington Spa (uk), United KingdomHQ checked Sep 17, 2026	51-200	159 contacts →
	Partial evidence “Drive System Design (DSD), a Hinduja Tech company, are internationally recognised experts in the rapid development of next-generation electric and hybrid powertrains, internal…” Source: RevenueBase Database · checked Sep 17, 2026
14	Z-Tech Control Systems LTD	Indirect evidence	Swavesey, United KingdomHQ checked Sep 17, 2026	201-500	156 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
15	Asee Group	Partial evidence	Newry, United KingdomHQ checked Sep 17, 2026	51-200	151 contacts →
	Partial evidence “ASEE Group is a leader in mechanical and electrical engineering, specialising in generator integration and full-service installations for 45+ years.” Source: RevenueBase Database · checked Sep 17, 2026
16	PN Daly Limited	Indirect evidence	Rochdale, United KingdomHQ checked Sep 17, 2026	501-1,000	141 contacts →
	Indirect evidence “P.N.” Source: RevenueBase Database · checked Sep 17, 2026
17	MCS	Partial evidence	Bristol, United KingdomHQ checked Sep 17, 2026	51-200	138 contacts →
	Partial evidence “MCS Ltd are specialist building services engineers covering all aspects of commercial and industrial building services and infrastructure engineering across varying market sectors.” Source: RevenueBase Database · checked Sep 17, 2026
18	Powerstar	Partial evidence	Sheffield, United KingdomHQ checked Sep 17, 2026	51-200	135 contacts →
	Partial evidence “A D2Zero Company With a 24-year track record, Powerstar is an industry leader in electrification, specialising in designing and manufacturing cutting-edge power management tech…” Source: RevenueBase Database · checked Sep 17, 2026
19	Powersystems	Indirect evidence	Bristol, United KingdomHQ checked Sep 17, 2026	51-200	126 contacts →
	Indirect evidence “Powered by People.” Source: RevenueBase Database · checked Sep 17, 2026
20	AF Switchgear	Partial evidence	Sutton-in-ashfield, United KingdomHQ checked Sep 17, 2026	201-500	117 contacts →
	Partial evidence “AF Switchgear is one of the UK's largest switchgear manufacturers and set the standard for LV Switchgear and Power Distribution.” Source: RevenueBase Database · checked Sep 17, 2026
21	TES Group	Partial evidence	Cookstown, United KingdomHQ checked Sep 17, 2026	51-200	116 contacts →
	Partial evidence “TES are Mechanical & Electrical Specialists, working to the highest standard of engineering excellence.” Source: RevenueBase Database · checked Sep 17, 2026
22	Darke & Taylor LTD	Partial evidence	Oxfordshire, United KingdomHQ checked Sep 17, 2026	51-200	112 contacts →
	Partial 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 17, 2026
23	G & A Barnie Group LTD	Indirect evidence	Inverness, United KingdomHQ checked Sep 17, 2026	201-500	109 contacts →
	Indirect evidence “Premier quality workmanship and personal attention are characteristics of G&A Barnie.” Source: RevenueBase Database · checked Sep 17, 2026
24	Excalon LTD	Indirect evidence	Salford, United KingdomHQ checked Sep 17, 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 17, 2026
25	Rock Power Connections LTD	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 17, 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 17, 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 engineering 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 power systems engineering companies.
Partial evidence: Its own public description names part of power systems engineering companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name power systems engineering 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 3,072 power systems engineering companies based in the United Kingdom

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Power systems engineering companies based in the United Kingdom at a glance

As of Sep 17, 2026

31.0%Verified-email coverage

9.2Average contacts per company

1-10Median size (employees)

6.1%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

1,650

11-50

1,129

51-200

196

201-500

501-1,000

1,001-5,000

5,001-10,000

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 3,072 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 engineering 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 “power systems engineering 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 power systems engineering 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 power systems engineering 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, 8,745 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 17, 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.

Power systems engineering companies by metro

Power systems engineering companies in London187
Power systems engineering companies in Manchester60
Power systems engineering companies in Nottingham43
Power systems engineering companies in Bristol37
Power systems engineering companies in Glasgow35
Power systems engineering companies in Leeds31
Power systems engineering companies in Sheffield29
Power systems engineering companies in Southampton27
Power systems engineering companies in Birmingham25

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 engineering 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 power systems engineering companies are there based in the United Kingdom?

RevenueBase identified 3,072 power systems engineering 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?

Kelly Group, headquartered in Wembley, tops this list with the largest team on record.

Which city has the most power systems engineering companies?

London leads with 187 headquartered companies, followed by Manchester (60) and Nottingham (43).

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 8,745 verified decision-maker contacts tracked across these 3,072 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 17, 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.