Company lists · Data refreshed September 2026

Top 25 On-site power generation companies based in the United Kingdom

Name: On-site power generation 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 20, 2026 474 companies tracked

RevenueBase identified 474 on-site power generation companies headquartered in the United Kingdom as of September 2026 and tracks 5,529 professional contacts across them, including 2,303 with verified work emails. London is the largest hub.

This list covers on-site power generation 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 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

474Companies

5,529Contacts tracked

2,303Verified emails

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The 25 largest on-site power generation companies based in the United Kingdom

Ranked by team size

Top 25 of 474 on-site power generation companies 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 on-site power generation 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	Nadara	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	629 contacts →
	Partial evidence “We’re Nadara, one of Europe’s largest renewable energy independent power producers.” Source: RevenueBase Database · checked Sep 20, 2026
2	Dale Power Solutions	Partial evidence	Scarborough, United KingdomHQ checked Sep 20, 2026	201-500	214 contacts →
	Partial 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
3	Centrax GAS Turbines	Indirect evidence	Newton Abbot, United KingdomHQ checked Sep 20, 2026	201-500	193 contacts →
	Indirect evidence “Centrax Gas Turbines manufacture gas turbine-powered generator sets ranging from 3.9 MW to 15 MW.” Source: RevenueBase Database · checked Sep 20, 2026
4	Generator Power	Partial evidence	Normanton, United KingdomHQ checked Sep 20, 2026	201-500	169 contacts →
	Partial evidence “Generator Power are specialists in the provision of power via the hire and sale of diesel and LPG generators, bunded fuel tanks and other ancillary equipment.” 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	Power Electrics	Indirect evidence	Warmley, United KingdomHQ checked Sep 20, 2026	201-500	161 contacts →
	Indirect evidence “We bring the energy!” Source: RevenueBase Database · checked Sep 20, 2026
7	TTEP	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	160 contacts →
	Strong evidence “TTEP is a flexible power generation company jointly owned by EPH and TotalEnergies.” Source: RevenueBase Database · checked Sep 20, 2026
8	Finning Power & Energy	Partial evidence	Cannock, United KingdomHQ checked Sep 20, 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 20, 2026
9	ADE Power	Partial evidence	Pontefract, United KingdomHQ checked Sep 20, 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 20, 2026
10	Econergy Renewable Energy LTD	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	112 contacts →
	Strong evidence “Our Vision Renewable energy will be the source of power for future generations.” Source: RevenueBase Database · checked Sep 20, 2026
11	AES	Indirect evidence	Enfield, United KingdomHQ checked Sep 20, 2026	201-500	112 contacts →
	Indirect evidence “As renewable energy technology experts, we have the knowledge and skills to help commercial clients switch to a greener, lower cost and more independent energy source.” Source: RevenueBase Database · checked Sep 20, 2026
12	Shenton Group	Partial evidence	Andover, United KingdomHQ checked Sep 20, 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 20, 2026
13	Cleaner Group	Indirect evidence	Wakefield, United KingdomHQ checked Sep 20, 2026	11-50	80 contacts →
	Indirect evidence “Cleaner Group is a UK leader in full turnkey renewable energy solutions; primarily for commercial EV charging and solar PV.” Source: RevenueBase Database · checked Sep 20, 2026
14	DTGEN	Strong evidence	Milngavie, United KingdomHQ checked Sep 20, 2026	51-200	79 contacts →
	Strong 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 20, 2026
15	Wattstor	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	70 contacts →
	Indirect evidence “Think Outside The Grid.” Source: RevenueBase Database · checked Sep 20, 2026
16	Mems Power Generation	Strong evidence	Gillingham, United KingdomHQ checked Sep 20, 2026	51-200	56 contacts →
	Strong 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
17	Ecolution Group	Indirect evidence	Trottiscliffe, United KingdomHQ checked Sep 20, 2026	51-200	55 contacts →
	Indirect evidence “Renewable Energy Experts: For over 25 years, Ecolution have been at the forefront of renewable energy services, using our award-winning expertise, to help our clients innovate and…” Source: RevenueBase Database · checked Sep 20, 2026
18	Evoenergy	Partial evidence	Nottingham, United KingdomHQ checked Sep 20, 2026	11-50	54 contacts →
	Partial evidence “Driving the market through innovation, EvoEnergy are the UK’s leading energy technology solutions provider, helping blue-chip clients and SME’s turn their sites into ‘sustainable…” Source: RevenueBase Database · checked Sep 20, 2026
19	Alt-Group	Partial evidence	Worcester, United KingdomHQ checked Sep 20, 2026	51-200	51 contacts →
	Partial evidence “Alt-Group is a forward-thinking, renewable energy company; advising on, installing and maintaining excellent renewable systems including Solar PV, EV Charging & Batteries.” Source: RevenueBase Database · checked Sep 20, 2026
20	Ylem Energy	Strong evidence	Manchester, United KingdomHQ checked Sep 20, 2026	51-200	51 contacts →
	Strong evidence “YLEM Energy is a leading independent power generation specialist with more than three decades’ experience in building, owning and operating smart generation systems.” Source: RevenueBase Database · checked Sep 20, 2026
21	AJ Power LTD	Strong evidence	Craigavon, United KingdomHQ checked Sep 20, 2026	51-200	41 contacts →
	Strong evidence “Based at a modern facility in Northern Ireland, UK, AJ Power produces diesel generating sets from 10kVA to 2800kVA using automotive manufacturing techniques, for use in hospitals…” Source: RevenueBase Database · checked Sep 20, 2026
22	Solarsense UK Certified B Corporation	Indirect evidence	Clevedon, United KingdomHQ checked Sep 20, 2026	51-200	39 contacts →
	Indirect evidence “SolarSense specialise in the design, installation and maintenance of solar panels, energy storage, solar carports and other renewable energy technologies.” Source: RevenueBase Database · checked Sep 20, 2026
23	Burtonwood Generator & Switchgear Services LTD	Strong evidence	St Helens, United KingdomHQ checked Sep 20, 2026	11-50	38 contacts →
	Strong 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
24	Energy Solutions UK LTD	Partial evidence	Aylesford, United KingdomHQ checked Sep 20, 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 20, 2026
25	Photon Energy	Indirect evidence	Reading, United KingdomHQ checked Sep 20, 2026	11-50	35 contacts →
	Indirect evidence “Photon Energy specialises in the design, supply, installation and maintenance of solar PV and battery storage systems.” 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: on-site power generation 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 on-site power generation companies.
Partial evidence: Its own public description names part of on-site power generation companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name on-site power generation 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 474 on-site power generation companies based in the United Kingdom

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On-site power generation companies based in the United Kingdom at a glance

As of Sep 20, 2026

41.7%Verified-email coverage

11.7Average contacts per company

1-10Median size (employees)

7.4%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

238

11-50

170

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 474 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 on-site power generation 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 “on-site power generation 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 on-site power generation 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 on-site power generation 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, 2,303 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.

On-site power generation companies by metro

On-site power generation companies in London35

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 on-site power generation 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 on-site power generation companies are there based in the United Kingdom?

RevenueBase identified 474 on-site power generation 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?

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

Which city has the most on-site power generation companies?

London leads with 35 headquartered companies, followed by Manchester (10) and Glasgow (9).

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 2,303 verified decision-maker contacts tracked across these 474 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.