Company lists · Data refreshed September 2026

Top 25 Solar energy consulting companies based in the United Kingdom

Name: Solar energy consulting 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 18, 2026 1,789 companies tracked

RevenueBase identified 1,789 solar energy consulting companies headquartered in the United Kingdom as of September 2026 and tracks 14,587 professional contacts across them, including 5,725 with verified work emails. London is the largest hub.

This list covers solar energy consulting 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 18, 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 18, 2026 86% judged on-target in blind review

1,789Companies

14,587Contacts tracked

5,725Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest solar energy consulting companies based in the United Kingdom

Ranked by team size

Top 25 of 1,789 solar energy consulting companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 18, 2026. RevenueBase Smart Search rates how each company's information relates to solar energy consulting 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	Penspen	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	1,001-5,000	1,007 contacts →
	Partial evidence “Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Source: RevenueBase Database · checked Sep 18, 2026
2	Natural Power	Partial evidence	Castle Douglas, United KingdomHQ checked Sep 18, 2026	501-1,000	500 contacts →
	Partial evidence “Natural Power is a leading independent consultancy and service provider for the renewable energy sector.” Source: RevenueBase Database · checked Sep 18, 2026
3	Fichtner Consulting Engineers LTD	Indirect evidence	Stockport, United KingdomHQ checked Sep 18, 2026	51-200	418 contacts →
	Indirect evidence “Fichtner is one of the world's leading independent engineering consultancy firms.” Source: RevenueBase Database · checked Sep 18, 2026
4	Reon Energy Limited	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	402 contacts →
	Partial evidence “Reon Energy is a leading Cleantech company deploying Intelligent Renewable Energy Microgrids across South Asia, GCC & African region.” Source: RevenueBase Database · checked Sep 18, 2026
5	EIC Partnership	Partial evidence	Redditch, United KingdomHQ checked Sep 18, 2026	51-200	316 contacts →
	Partial evidence “EIC Partnership: A Legacy of Expertise, A Commitment to Sustainability With origins dating back to 1975, EIC has cultivated nearly 50 years of distinguished service in energy and…” Source: RevenueBase Database · checked Sep 18, 2026
6	Intec Energy Solutions	Partial evidence	London, United KingdomHQ checked Sep 18, 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 18, 2026
7	Wiseenergy	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	195 contacts →
	Partial evidence “WiseEnergy is a trusted solar asset manager, delivering a full range of market-leading services to our global clients.” Source: RevenueBase Database · checked Sep 18, 2026
8	OWC	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	185 contacts →
	Partial evidence “The Renewable Energy Consultants.” Source: RevenueBase Database · checked Sep 18, 2026
9	Wood Thilsted	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	175 contacts →
	Partial evidence “Wood Thilsted is a world-leading renewable energy engineering consultancy experienced and specialised in offshore wind.” Source: RevenueBase Database · checked Sep 18, 2026
10	CFP Energy	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	171 contacts →
	Partial evidence “CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Source: RevenueBase Database · checked Sep 18, 2026
11	The Sirius Group	Indirect evidence	Durham, United KingdomHQ checked Sep 18, 2026	201-500	156 contacts →
	Indirect evidence “End to End Service: From initial investigations and assessments to planning, design and engineering support, we give you a foundation of confidence for your site development…” Source: RevenueBase Database · checked Sep 18, 2026
12	TNEI	Partial evidence	Manchester, United KingdomHQ checked Sep 18, 2026	51-200	150 contacts →
	Partial evidence “TNEI is an independent specialist energy consultancy providing technical, strategic, environmental and consenting advice to organisations operating within the conventional and…” Source: RevenueBase Database · checked Sep 18, 2026
13	JD Ross Energy	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	143 contacts →
	Partial evidence “JD Ross Energy is an international talent consultancy that solely focuses on the Renewable Energy sector, connecting the best talent across the globe with companies that are…” Source: RevenueBase Database · checked Sep 18, 2026
14	LCP Delta	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	137 contacts →
	Partial evidence “We help our clients to invest in and navigate the energy transition.” Source: RevenueBase Database · checked Sep 18, 2026
15	Consultus	Strong evidence	Leicester, United KingdomHQ checked Sep 18, 2026	51-200	129 contacts →
	Strong evidence “Recognised as the Consultancy of the Year in 2021 by Energy Live News, Consultus delivers world-class consulting, buying and management services for Business Energy and Business…” Source: RevenueBase Database · checked Sep 18, 2026
16	AMBER	Partial evidence	Cardiff, United KingdomHQ checked Sep 18, 2026	51-200	124 contacts →
	Partial evidence “We are an award-winning energy consultancy and certified B Corp™.” Source: RevenueBase Database · checked Sep 18, 2026
17	Project Solar UK	Strong evidence	Burton On Trent, United KingdomHQ checked Sep 18, 2026	201-500	122 contacts →
	Strong evidence “Project Solar UK Ltd are a well-established Renewable Energy company.” Source: RevenueBase Database · checked Sep 18, 2026
18	Longevity Partners	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	115 contacts →
	Partial evidence “Longevity Partners is a multidisciplinary energy and sustainability consultancy.” Source: RevenueBase Database · checked Sep 18, 2026
19	Sunel Group	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	113 contacts →
	Partial evidence “SUNEL GROUP is a globally recognized EPC Contractor and Developer for Solar projects.” Source: RevenueBase Database · checked Sep 18, 2026
20	AES	Partial evidence	Enfield, United KingdomHQ checked Sep 18, 2026	201-500	112 contacts →
	Partial 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 18, 2026
21	TROO	Partial evidence	Doxford International Business Park, United KingdomHQ checked Sep 18, 2026	51-200	106 contacts →
	Partial evidence “Managing business energy can be overwhelming.” Source: RevenueBase Database · checked Sep 18, 2026
22	Everoze	Indirect evidence	Bristol, United KingdomHQ checked Sep 18, 2026	51-200	100 contacts →
	Indirect evidence “Everoze is an employee-owned renewables, green hydrogen and storage consultancy.” Source: RevenueBase Database · checked Sep 18, 2026
23	Belectric UK Member Of Elevion Group	Partial evidence	Brinkworth, United KingdomHQ checked Sep 18, 2026	51-200	95 contacts →
	Partial evidence “BELECTRIC UK is part of BELECTRIC, one of Europe's leading EPC service providers in the development, construction, and operation of solar power plants.” Source: RevenueBase Database · checked Sep 18, 2026
24	The Green Energy Advice Bureau	Partial evidence	Sunderland, United KingdomHQ checked Sep 18, 2026	51-200	90 contacts →
	Partial evidence “The Green Energy Advice Bureau are a leading independent award-winning UK commercial energy consultancy.” Source: RevenueBase Database · checked Sep 18, 2026
25	Alfa Energy An Edison Energy Company	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	88 contacts →
	Partial evidence “Alfa Energy Group (an Edison Energy company) is an international energy, sustainability and technology consultant partner with 200 employees over four international locations.” Source: RevenueBase Database · checked Sep 18, 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: solar energy consulting 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 solar energy consulting companies.
Partial evidence: Its own public description names part of solar energy consulting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name solar energy consulting 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 1,789 solar energy consulting companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 5,725 reachable decision-makers.

Free signup · no credit card

View the full list →

Solar energy consulting companies based in the United Kingdom at a glance

As of Sep 18, 2026

39.2%Verified-email coverage

8.2Average contacts per company

1-10Median size (employees)

14.5%Largest-city concentration · London

Sep 18, 2026Page data refreshed

Companies by employee count

1-10

1,084

11-50

564

51-200

107

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 1,789 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 solar energy consulting 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 “solar energy consulting 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 solar energy consulting 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 solar energy consulting 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, 5,725 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 18, 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.

Solar energy consulting companies by metro

Solar energy consulting companies in London259
Solar energy consulting companies in Manchester37
Solar energy consulting companies in Glasgow30
Solar energy consulting companies in Nottingham27

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 solar energy consulting 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 solar energy consulting companies are there based in the United Kingdom?

RevenueBase identified 1,789 solar energy consulting 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?

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

Which city has the most solar energy consulting companies?

London leads with 259 headquartered companies, followed by Manchester (37) and Glasgow (30).

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 5,725 verified decision-maker contacts tracked across these 1,789 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 18, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,789 solar energy consulting companies based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Solar energy consulting companies by geography

Browse the directory

Browse: Companies home · All United Kingdom lists · All Solar energy consulting companies lists · New lists

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.