Company lists · Data refreshed September 2026

Top 25 Renewable energy equipment upgrade companies based in the United Kingdom

Name: Renewable energy equipment upgrade 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 2,451 companies tracked

RevenueBase identified 2,451 renewable energy equipment upgrade companies headquartered in the United Kingdom as of September 2026 and tracks 27,408 professional contacts across them, including 10,596 with verified work emails. London is the largest hub.

This list covers renewable energy equipment upgrade 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

2,451Companies

27,408Contacts tracked

10,596Verified emails

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The 25 largest renewable energy equipment upgrade companies based in the United Kingdom

Ranked by team size

Top 25 of 2,451 renewable energy equipment upgrade 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 renewable energy equipment upgrade 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	RES	Strong evidence	Kings Langley, United KingdomHQ checked Sep 17, 2026	1,001-5,000	3,721 contacts →
	Strong evidence “RES is the world’s largest independent renewable energy company, working across 24 countries and active in wind, solar, energy storage, green hydrogen, transmission, and…” Source: RevenueBase Database · checked Sep 17, 2026
2	Dalkia UK	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	5,001-10,000	1,064 contacts →
	Partial evidence “Together, we’re delivering technical solutions for a better society and an Electric Britain Dalkia is one of the UK’s leading technical and energy services providers at the…” Source: RevenueBase Database · checked Sep 17, 2026
3	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
4	Sonnedix	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	563 contacts →
	Strong evidence “Sonnedix is a global renewable energy company delivering 100% clean electricity directly to customers through a diversified portfolio of solar, wind, and storage assets.” Source: RevenueBase Database · checked Sep 17, 2026
5	Natural Power	Strong evidence	Castle Douglas, United KingdomHQ checked Sep 17, 2026	501-1,000	500 contacts →
	Strong evidence “Natural Power is a leading independent consultancy and service provider for the renewable energy sector.” Source: RevenueBase Database · checked Sep 17, 2026
6	Good Energy	Strong evidence	Chippenham, United KingdomHQ checked Sep 17, 2026	201-500	456 contacts →
	Strong evidence “Good Energy has been driving the UK’s renewable energy revolution since helping homes and businesses become greener and more self-sufficient through clean power and green…” Source: RevenueBase Database · checked Sep 17, 2026
7	Cubico Sustainable Investments	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	406 contacts →
	Strong evidence “Cubico Sustainable Investments is one of the world’s largest privately-owned renewable energy companies, leveraging our strong local presence with a unique combination of in-house…” Source: RevenueBase Database · checked Sep 17, 2026
8	SO Energy	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	378 contacts →
	Partial evidence “We do energy, you do you.” Source: RevenueBase Database · checked Sep 17, 2026
9	Clarkson Evans LTD	Indirect evidence	Gloucester, United KingdomHQ checked Sep 17, 2026	501-1,000	331 contacts →
	Indirect evidence “With over 850 staff, we are one of the UK’s leading electrical contractors and solar PV installers.” Source: RevenueBase Database · checked Sep 17, 2026
10	Intec Energy Solutions	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	242 contacts →
	Partial 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
11	OWC	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	185 contacts →
	Strong evidence “The Renewable Energy Consultants.” Source: RevenueBase Database · checked Sep 17, 2026
12	Wood Thilsted	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	175 contacts →
	Strong evidence “Wood Thilsted is a world-leading renewable energy engineering consultancy experienced and specialised in offshore wind.” Source: RevenueBase Database · checked Sep 17, 2026
13	Myenergi	Partial evidence	Stallingborough, United KingdomHQ checked Sep 17, 2026	201-500	168 contacts →
	Partial evidence “We give you control of your generated green energy, creating the ultimate eco-smart home.” Source: RevenueBase Database · checked Sep 17, 2026
14	British Solar Renewables	Partial evidence	Shepton Mallet, United KingdomHQ checked Sep 17, 2026	51-200	148 contacts →
	Partial evidence “Clean energy, powered with purpose.” Source: RevenueBase Database · checked Sep 17, 2026
15	Irwin M&e	Strong evidence	Portadown, United KingdomHQ checked Sep 17, 2026	201-500	134 contacts →
	Strong evidence “We provide a full range of Mechanical, Electrical, Energy and Renewables installation and maintenance services to clients, across both public and private sectors throughout the UK…” Source: RevenueBase Database · checked Sep 17, 2026
16	Smith & Byford	Indirect evidence	Cheam, United KingdomHQ checked Sep 17, 2026	201-500	132 contacts →
	Indirect evidence “Smith & Byford is a family-owned and operated building services company.” Source: RevenueBase Database · checked Sep 17, 2026
17	Bryt Energy	Partial evidence	Birmingham, United KingdomHQ checked Sep 17, 2026	51-200	129 contacts →
	Partial evidence “Part of the Statkraft group, we provide British businesses with zero carbon, 100% renewable electricity*, sourced solely from Solar, Wind and Hydro.” Source: RevenueBase Database · checked Sep 17, 2026
18	Project Solar UK	Strong evidence	Burton On Trent, United KingdomHQ checked Sep 17, 2026	201-500	122 contacts →
	Strong evidence “Project Solar UK Ltd are a well-established Renewable Energy company.” Source: RevenueBase Database · checked Sep 17, 2026
19	EDF Renewables UK & Ireland	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	117 contacts →
	Strong evidence “EDF Renewables is part of one of the world’s leading renewable energy companies in the UK.” Source: RevenueBase Database · checked Sep 17, 2026
20	BOXT	Indirect evidence	Leeds, United KingdomHQ checked Sep 17, 2026	51-200	116 contacts →
	Indirect evidence “We started out as a trailblazing boiler installation company in 2017 – the first to offer everything effortlessly online.” Source: RevenueBase Database · checked Sep 17, 2026
21	AES	Strong evidence	Enfield, United KingdomHQ checked Sep 17, 2026	201-500	112 contacts →
	Strong 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 17, 2026
22	Glow Green	Indirect evidence	Bournemouth, United KingdomHQ checked Sep 17, 2026	51-200	110 contacts →
	Indirect evidence “Glow Green is one of the UK's leading installers of Solar Panels, Battery Storage, Heat Pumps, Boilers, AC Units, & EV Chargers.” Source: RevenueBase Database · checked Sep 17, 2026
23	Correct Contract Services CCS	Partial evidence	Andover, United KingdomHQ checked Sep 17, 2026	201-500	108 contacts →
	Partial evidence “Correct Contract Services (CCS) is a trusted main contractor for compliance and energy services, expertly serving social housing landlords across the UK.” Source: RevenueBase Database · checked Sep 17, 2026
24	TSG UK	Partial evidence	Dundee, United KingdomHQ checked Sep 17, 2026	201-500	105 contacts →
	Partial evidence “TSG UK is the leading UK provider of turnkey multi‑energy infrastructure solutions, supporting the transition from traditional fuels to EV charging, solar and new energies.” Source: RevenueBase Database · checked Sep 17, 2026
25	Eenergy	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	98 contacts →
	Partial evidence “eEnergy (AIM: EAAS) is a UK-based Energy-as-a-Service (EaaS) provider, funding and delivering energy-saving and energy-generating solutions across multi-site public sector and…” 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: renewable energy equipment upgrade 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 renewable energy equipment upgrade companies.
Partial evidence: Its own public description names part of renewable energy equipment upgrade companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name renewable energy equipment upgrade 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 2,451 renewable energy equipment upgrade companies based in the United Kingdom

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Renewable energy equipment upgrade companies based in the United Kingdom at a glance

As of Sep 17, 2026

38.7%Verified-email coverage

11.2Average contacts per company

1-10Median size (employees)

9.4%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

1,274

11-50

905

51-200

203

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 2,451 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 renewable energy equipment upgrade 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 “renewable energy equipment upgrade 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 renewable energy equipment upgrade 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 renewable energy equipment upgrade 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, 10,596 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.

Renewable energy equipment upgrade companies by metro

Renewable energy equipment upgrade companies in London230
Renewable energy equipment upgrade companies in Glasgow45
Renewable energy equipment upgrade companies in Manchester41
Renewable energy equipment upgrade companies in Nottingham38
Renewable energy equipment upgrade companies in Bristol32
Renewable energy equipment upgrade companies in Liverpool28
Renewable energy equipment upgrade companies in Sheffield27

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 renewable energy equipment upgrade 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 renewable energy equipment upgrade companies are there based in the United Kingdom?

RevenueBase identified 2,451 renewable energy equipment upgrade 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?

RES, headquartered in Kings Langley, tops this list with the largest team on record.

Which city has the most renewable energy equipment upgrade companies?

London leads with 230 headquartered companies, followed by Glasgow (45) and Manchester (41).

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 10,596 verified decision-maker contacts tracked across these 2,451 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.