Company lists · Data refreshed September 2026

Top 25 Renewable energy consulting firms based in London, United Kingdom

RevenueBase identified 329 renewable energy consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 5,292 professional contacts across them, including 2,137 with verified work emails. London is the largest hub.

This list covers renewable energy consulting firms 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
329Companies
5,292Contacts tracked
2,137Verified emails
Explore all 329 companies → Free signup · no credit card · 500 free credits

The 25 largest renewable energy consulting firms based in London, United Kingdom

Ranked by team size
Top 25 of 329 renewable energy consulting firms 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 consulting firms: 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.
#CompanyHeadquartersEmployeesContacts
1
PenspenPartial evidence
London, United KingdomHQ checked Sep 5, 20261,001-5,0001,007

“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
2London, United KingdomHQ checked Sep 5, 2026501-1,000406

“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: company website · checked Sep 5, 2026
3
GenesisPartial evidence
London, United KingdomHQ checked Sep 5, 2026501-1,000401

“Genesis is a market-leading advisory company focused on providing high-value technical and advisory services for the energy industry.”

Source: company website · checked Sep 5, 2026
4
Intec Energy SolutionsPartial evidence
London, United KingdomHQ checked Sep 5, 2026501-1,000242

“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
5
OWCStrong evidence
London, United KingdomHQ checked Sep 5, 202651-200185

“The Renewable Energy Consultants.”

Source: company website · checked Sep 5, 2026
6
Wood ThilstedStrong evidence
London, United KingdomHQ checked Sep 5, 202651-200175

“Wood Thilsted is a world-leading renewable energy engineering consultancy experienced and specialised in offshore wind.”

Source: company website · checked Sep 5, 2026
7
CFP EnergyPartial evidence
London, United KingdomHQ checked Sep 5, 2026201-500171

“CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.”

Source: company website · checked Sep 5, 2026
8
Octopus Energy GenerationPartial evidence
London, United KingdomHQ checked Sep 5, 2026201-500153

“At Octopus Energy Generation, we’re building green power for the future, from large-scale solar to onshore and offshore wind, and innovative initiatives like the Fan Club.”

Source: company website · checked Sep 5, 2026
9
JD Ross EnergyStrong evidence
London, United KingdomHQ checked Sep 5, 2026201-500143

“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
10
Longevity PartnersPartial evidence
London, United KingdomHQ checked Sep 5, 202651-200115

“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, 2026201-500107

“Add Energy's divisions have split and merged into two separate ABL Group companies.”

Source: company website · checked Sep 5, 2026
12London, United KingdomHQ checked Sep 5, 2026201-50088

“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
13
InnovaStrong evidence
London, United KingdomHQ checked Sep 5, 202651-20077

“Innova is a forward-thinking renewable energy business, employing people across two offices in London and Cheltenham.”

Source: company website · checked Sep 5, 2026
14London, United KingdomHQ checked Sep 5, 202651-20066

“We are a leading independent consulting company with global expertise in Refining, Gas, Petrochemicals, Renewables, and Alternative Energies.”

Source: company website · checked Sep 5, 2026
15
Advantage Utilities LTDPartial evidence
London, United KingdomHQ checked Sep 5, 202611-5050

“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
16
Engage ConsultingPartial evidence
London, United KingdomHQ checked Sep 5, 202611-5048

Energy Industry Experts We are subject matter experts in the energy sector.”

Source: company website · checked Sep 5, 2026
17
AVA EnergyPartial evidence
London, United KingdomHQ checked Sep 5, 202611-5047

“AVA Energy – Powering Energy Talent.”

Source: company website · checked Sep 5, 2026
18
GAS StrategiesIndirect evidence
London, United KingdomHQ checked Sep 5, 202611-5045

“In a world where speed is a competitive advantage, Gas Strategies accelerates your route to readiness.”

Source: company website · checked Sep 5, 2026
19
Augusta & COStrong evidence
London, United KingdomHQ checked Sep 5, 202611-5044

“Augusta is a London-based specialist financial advisory firm serving the renewables and energy transition sector.”

Source: company website · checked Sep 5, 2026
20
Amberside AdvisorsPartial evidence
London, United KingdomHQ checked Sep 5, 202611-5044

“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
21
SyzygyIndirect evidence
London, United KingdomHQ checked Sep 5, 202611-5035

“Founded in 2010, Syzygy is the leading specialist low carbon technology consultancy for the real estate sector.”

Source: company website · checked Sep 5, 2026
22
EnvisionPartial evidence
London, United KingdomHQ checked Sep 5, 202611-5034

“Envision is a specialist sustainability, energy and net zero design consultancy offering strategic and technical advice within the built environment and to businesses wishing to…”

Source: company website · checked Sep 5, 2026
23
Enlist SolutionIndirect evidence
London, United KingdomHQ checked Sep 5, 202611-5031

“We are an International Solution Provider with Offices in the United Kingdom and Europe.”

Source: company website · checked Sep 5, 2026
24
Samuel Knight EnergyStrong evidence
London, United KingdomHQ checked Sep 5, 202651-20027

Renewable Energy Staffing & Project Specialists across UK, EUROPE, USA, APAC.”

Source: company website · checked Sep 5, 2026
25
EtascaPartial evidence
London, United KingdomHQ checked Sep 5, 202611-5027

“The energy transition is gaining momentum but needs to accelerate to meet the challenges posed by the climate emergency.”

Source: company website · checked Sep 5, 2026

Showing 25 of 329 renewable energy consulting firms based in London, United Kingdom

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Renewable energy consulting firms based in London, United Kingdom at a glance

As of Sep 5, 2026
1-10Median size (employees)
LondonLargest hub · 329 HQs
Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
212
11-50
87
51-200
14
201-500
8
501-1,000
4
1,001-5,000
4

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 329 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 consulting firms, 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 consulting firms”. 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 consulting firms, 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, 2,137 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 consulting firms by metro in the United Kingdom

Frequently asked

How many renewable energy consulting firms are there based in London, United Kingdom?

RevenueBase identified 329 renewable energy consulting firms 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 consulting firms?

London leads with 329 headquartered companies, followed by Manchester (38) and Glasgow (32).

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 2,137 verified decision-maker contacts tracked across these 329 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.