Company lists · Data refreshed September 2026

Top 25 Renewable energy consultancy companies based in London, United Kingdom

Name: Renewable energy consultancy companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 418 companies tracked

RevenueBase identified 418 renewable energy consultancy companies headquartered in London, United Kingdom as of September 2026 and tracks 5,021 professional contacts across them, including 2,047 with verified work emails. London is the largest hub.

This list covers renewable energy consultancy companies headquartered in London, 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

418Companies

5,021Contacts tracked

2,047Verified emails

Explore all 418 companies → Free signup · no credit card · 500 free credits

The 25 largest renewable energy consultancy companies based in London, United Kingdom

Ranked by team size

Top 25 of 418 renewable energy consultancy companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names renewable energy consultancy companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	PenspenPartial evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	1,007
	“Penspen designs, maintains, and optimises energy infrastructure to improve access to secure and sustainable energy for communities worldwide.” Source: company website · checked Sep 5, 2026
2	Intec Energy SolutionsPartial evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	242
	“INTEC Energy Solutions delivers best-in-class services in Engineering, Procurement, Construction (EPC), Battery Energy Storage Systems (BESS), Manufacturing, Project Development…” Source: company website · checked Sep 5, 2026
3	OWCStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	185
	“The Renewable Energy Consultants.” Source: company website · checked Sep 5, 2026
4	Wood ThilstedStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	175
	“Wood Thilsted is a world-leading renewable energy engineering consultancy experienced and specialised in offshore wind.” Source: company website · checked Sep 5, 2026
5	CFP EnergyPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	171
	“CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Source: company website · checked Sep 5, 2026
6	JD Ross EnergyStrong evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	143
	“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: company website · checked Sep 5, 2026
7	Longitude EngineeringPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	138
	“The Engineering Consultants.” Source: company website · checked Sep 5, 2026
8	EDF Renewables UK & IrelandStrong evidence	London, United KingdomHQ checked Sep 5, 2026	501-1,000	117
	“EDF Renewables is part of one of the world’s leading renewable energy companies in the UK.” Source: company website · checked Sep 5, 2026
9	ZTPIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	115
	“At ZTP, we’re committed to accelerating the transition to a more sustainable future by reducing the negative impact of human activity on our planet - ecologically, financially…” Source: company website · checked Sep 5, 2026
10	Longevity PartnersStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	115
	“Longevity Partners is a multidisciplinary energy and sustainability consultancy.” Source: company website · checked Sep 5, 2026
11	ADD EnergyPartial evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	107
	“Add Energy's divisions have split and merged into two separate ABL Group companies.” Source: company website · checked Sep 5, 2026
12	RenewableukStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	100
	“RenewableUK is the voice of the UK’s renewable energy industry.” Source: company website · checked Sep 5, 2026
13	REAStrong evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	93
	“The REA is the UK's largest trade association for renewable energy and clean technologies with around 500 members operating across heat, transport, power and the circular economy.” Source: company website · checked Sep 5, 2026
14	Sustainable AdvantageIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	89
	“Sustainable Advantage partners with Private Equity funds and businesses across the UK, France, and wider Europe.” Source: company website · checked Sep 5, 2026
15	Alfa Energy An Edison Energy CompanyStrong evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	88
	“Alfa Energy Group (an Edison Energy company) is an international energy, sustainability and technology consultant partner with 200 employees over four international locations.” Source: company website · checked Sep 5, 2026
16	OPCStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	58
	“OPC is a leading global energy consultancy specialising in providing clients with top-tier expertise and innovative solutions across the upstream E&P, Gas and CO2 storage domains…” Source: company website · checked Sep 5, 2026
17	Advantage Utilities LTDPartial evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	50
	“Advantage Utilities mission is to provide customers with a “One-Stop-Shop” for all their energy needs – with Market Leading Data/Expertise and Unrivalled “Drop Everything”…” Source: company website · checked Sep 5, 2026
18	Engage ConsultingPartial evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	48
	“Energy Industry Experts We are subject matter experts in the energy sector.” Source: company website · checked Sep 5, 2026
19	AVA EnergyPartial evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	47
	“AVA Energy – Powering Energy Talent.” Source: company website · checked Sep 5, 2026
20	Clarksons Offshore & RenewablesIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	45
	“Part of the Clarksons Group, the world’s leading provider of integrated shipping services.” Source: company website · checked Sep 5, 2026
21	GAS StrategiesIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	45
	“In a world where speed is a competitive advantage, Gas Strategies accelerates your route to readiness.” Source: company website · checked Sep 5, 2026
22	Augusta & COStrong evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	44
	“Augusta is a London-based specialist financial advisory firm serving the renewables and energy transition sector.” Source: company website · checked Sep 5, 2026
23	Amberside AdvisorsStrong evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	44
	“Amberside Advisors is an independent consultancy providing financial and commercial advice to low carbon energy, infrastructure and public sector projects.” Source: company website · checked Sep 5, 2026
24	Golden Globe Merchants LTDPartial evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	38
	“At Golden Globe Merchants, we deliver high-performance, energy-efficient solutions designed to future-proof UK homes.” Source: company website · checked Sep 5, 2026
25	SyzygyPartial evidence	London, United KingdomHQ checked Sep 5, 2026	11-50	35
	“Founded in 2010, Syzygy is the leading specialist low carbon technology consultancy for the real estate sector.” Source: company website · checked Sep 5, 2026

Showing 25 of 418 renewable energy consultancy companies based in London, United Kingdom

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Renewable energy consultancy companies based in London, United Kingdom at a glance

As of Sep 5, 2026

1-10Median size (employees)

LondonLargest hub · 418 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

265

11-50

116

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United Kingdom list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for London, over 418 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 consultancy companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, United Kingdom whose own description of what they do matches “renewable energy consultancy companies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among renewable energy consultancy companies, and records with no verified work email. Companies headquartered outside London 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 an evidence 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, 2,047 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 5, 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 consultancy companies by metro in the United Kingdom

Renewable energy consultancy companies in London418
Renewable energy consultancy companies in Manchester53
Renewable energy consultancy companies in Glasgow47
Renewable energy consultancy companies in Bristol41
Renewable energy consultancy companies in Edinburgh40
Renewable energy consultancy companies in Nottingham32
Renewable energy consultancy companies in Leeds26

Frequently asked

How many renewable energy consultancy companies are there based in London, United Kingdom?

RevenueBase identified 418 renewable energy consultancy companies headquartered in London, 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 renewable energy consultancy companies?

London leads with 418 headquartered companies, followed by Manchester (53) and Glasgow (47).

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 2,047 verified decision-maker contacts tracked across these 418 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 5, 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 SmartSearch, 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.