Company lists · Data refreshed September 2026

Top 25 Grid infrastructure companies based in the United Kingdom

Name: Grid 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 442 companies tracked

RevenueBase identified 442 grid infrastructure companies headquartered in the United Kingdom as of September 2026 and tracks 10,930 professional contacts across them, including 4,141 with verified work emails. London is the largest hub.

This list covers grid 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

442Companies

10,930Contacts tracked

4,141Verified emails

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The 25 largest grid infrastructure companies based in the United Kingdom

Ranked by team size

Top 25 of 442 grid 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 grid 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	Kelly Group	Indirect evidence	Wembley, United KingdomHQ checked Sep 19, 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 19, 2026
2	Calisen	Indirect evidence	Manchester, United KingdomHQ checked Sep 19, 2026	1,001-5,000	692 contacts →
	Indirect evidence “We are Calisen.” Source: RevenueBase Database · checked Sep 19, 2026
3	Freedom	Indirect evidence	Leeds, United KingdomHQ checked Sep 19, 2026	1,001-5,000	664 contacts →
	Indirect evidence “Freedom is a leading provider of facilities and power engineering services.” Source: RevenueBase Database · checked Sep 19, 2026
4	Aureos	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1,001-5,000	583 contacts →
	Indirect evidence “Aureos is a multi-disciplinary energy, transport networks specialist and engineering services provider, spanning the design, engineering, installation, maintenance, and crisis…” Source: RevenueBase Database · checked Sep 19, 2026
5	Avove Utilities	Indirect evidence	Chorley, United KingdomHQ checked Sep 19, 2026	501-1,000	440 contacts →
	Indirect evidence “Transforming utilities for communities We are an expert, responsible and agile partner, providing vital services to the UK’s utilities networks.” Source: RevenueBase Database · checked Sep 19, 2026
6	Brush Group	Partial evidence	Loughborough, United KingdomHQ checked Sep 19, 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 19, 2026
7	SPL Powerlines Uk&i	Partial evidence	Coatbridge, United KingdomHQ checked Sep 19, 2026	501-1,000	337 contacts →
	Partial 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 19, 2026
8	Omexom UK	Indirect evidence	Belfast, United KingdomHQ checked Sep 19, 2026	501-1,000	325 contacts →
	Indirect evidence “Omexom in the United Kingdom and Republic of Ireland is the VINCI Energies brand dedicated to the Generation, Transmission, and Distribution of electricity as well as the design…” Source: RevenueBase Database · checked Sep 19, 2026
9	UKPS	Indirect evidence	Stonehouse, United KingdomHQ checked Sep 19, 2026	501-1,000	236 contacts →
	Indirect evidence “UKPS now operating as Last Mile across Great Britain We’re excited to announce that from 16th March 2026, UKPS is formally adopting the Last Mile name.” Source: RevenueBase Database · checked Sep 19, 2026
10	IQA Elecnor	Partial evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	201-500	184 contacts →
	Partial 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 19, 2026
11	PN Daly Limited	Indirect evidence	Rochdale, United KingdomHQ checked Sep 19, 2026	501-1,000	141 contacts →
	Indirect evidence “P.N.” Source: RevenueBase Database · checked Sep 19, 2026
12	ESP Utilities Group LTD	Indirect evidence	Leatherhead, United KingdomHQ checked Sep 19, 2026	51-200	136 contacts →
	Indirect evidence “ESP Utilities Group Ltd is licensed to operate gas and electricity networks by the industry regulator Ofgem and has helped thousands across the country to make the connection.” Source: RevenueBase Database · checked Sep 19, 2026
13	Powersystems	Indirect evidence	Bristol, United KingdomHQ checked Sep 19, 2026	51-200	126 contacts →
	Indirect evidence “Powered by People.” Source: RevenueBase Database · checked Sep 19, 2026
14	Integrated Utility Services	Partial evidence	Wakefield, United KingdomHQ checked Sep 19, 2026	51-200	121 contacts →
	Partial 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
15	Excalon LTD	Indirect evidence	Salford, United KingdomHQ checked Sep 19, 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 19, 2026
16	Rock Power Connections LTD	Indirect evidence	Bromsgrove, United KingdomHQ checked Sep 19, 2026	51-200	105 contacts →
	Indirect evidence “Rock Power Connections are experts in electrical connections with a proven track record of quality and safety.” Source: RevenueBase Database · checked Sep 19, 2026
17	GTDS	Partial evidence	Hill, United KingdomHQ checked Sep 19, 2026	51-200	82 contacts →
	Partial evidence “GTDS was established in July 2004 to provide specialist installation and commissioning services to the major manufacturers, National Grid and the Distribution Network Operators…” Source: RevenueBase Database · checked Sep 19, 2026
18	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
19	Advantage NRG	Indirect evidence	Chorley, United KingdomHQ checked Sep 19, 2026	51-200	78 contacts →
	Indirect evidence “Advantage NRG is a specialist, labour only, sub-contractor using its own skilled labour force to build and maintain electrical transmission systems.” Source: RevenueBase Database · checked Sep 19, 2026
20	GMSL	Indirect evidence	Cambridge, United KingdomHQ checked Sep 19, 2026	51-200	76 contacts →
	Indirect evidence “GMSL are the market leaders in software and 24/7 operations for gas and power companies across Europe.” Source: RevenueBase Database · checked Sep 19, 2026
21	Infrastructure Gateway LTD	Partial evidence	Kettering, United KingdomHQ checked Sep 19, 2026	51-200	76 contacts →
	Partial evidence “Infrastructure Gateway Ltd have been working with developers providing them with the expertise to deliver the utilities on construction projects for over 20 years.” Source: RevenueBase Database · checked Sep 19, 2026
22	Esmart Networks	Indirect evidence	Braintree, United KingdomHQ checked Sep 19, 2026	51-200	75 contacts →
	Indirect evidence “Securing your power needs to deliver your electrification plans with certainty.” Source: RevenueBase Database · checked Sep 19, 2026
23	Global Substation Solutions LTD	Indirect evidence	Hebburn, United KingdomHQ checked Sep 19, 2026	51-200	75 contacts →
	Indirect evidence “Established in 2006, Global Substation Solutions Ltd (GSS) are a dynamic power system engineering company, providing turnkey project services to the UK and international…” Source: RevenueBase Database · checked Sep 19, 2026
24	Reactive Technologies Limited	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	66 contacts →
	Partial evidence “Reactive Technologies (RTL) is a global Grid-Enhancing Technologies (GETs) company addressing the challenges of energy transition, electrification and accelerating load growth.” Source: RevenueBase Database · checked Sep 19, 2026
25	AUS LTD	Indirect evidence	Clayton West, United KingdomHQ checked Sep 19, 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 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: grid 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 grid infrastructure companies.
Partial evidence: Its own public description names part of grid infrastructure companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name grid 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 442 grid infrastructure companies based in the United Kingdom

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Grid infrastructure companies based in the United Kingdom at a glance

As of Sep 19, 2026

37.9%Verified-email coverage

24.7Average contacts per company

11-50Median size (employees)

8.8%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

182

11-50

158

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 442 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 grid 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 “grid 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 grid 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 grid 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, 4,141 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.

Grid infrastructure companies by metro

Grid infrastructure companies in London39

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 grid 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 grid infrastructure companies are there based in the United Kingdom?

RevenueBase identified 442 grid 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?

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

Which city has the most grid infrastructure companies?

London leads with 39 headquartered companies, followed by Manchester (19) and Glasgow (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 4,141 verified decision-maker contacts tracked across these 442 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.