Company lists · Data refreshed October 2026

Top 25 Energy efficiency engineers based in London, United Kingdom

Name: Energy efficiency engineers based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 12, 2026 142 companies tracked

RevenueBase identified 142 company matches for energy efficiency engineers associated with London, United Kingdom as of October 2026 and tracks 2,964 professional contacts across them, including 1,677 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for energy efficiency engineers associated with London, United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 12, 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 RevenueBase SmartSearch · Exact Recorded Oct 12, 2026 How this list was built

142Companies

2,964Contacts tracked

1,677Verified emails

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

The 25 largest energy efficiency engineers based in London, United Kingdom

Ranked by team size

Top 25 of 142 company matches for energy efficiency engineers based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 12, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Dalkia UK	Exact match	London, United KingdomHQ recorded Oct 12, 2026	5,001-10,000	1,110 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
2	Atelier TEN	Exact match	London, United KingdomHQ recorded Oct 12, 2026	51-200	311 contacts →
	Exact match “As environmental design consultants, building services engineers and lighting designers, we are committed to high performance and sustainable design within the built environment.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
3	CFP Energy	Exact match	London, United KingdomHQ recorded Oct 12, 2026	201-500	173 contacts →
	Exact match “CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
4	ZTP	Exact match	London, United KingdomHQ recorded Oct 12, 2026	51-200	128 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
5	Longevity Partners	Exact match	London, United KingdomHQ recorded Oct 12, 2026	51-200	128 contacts →
	Exact match “Longevity Partners is a multidisciplinary energy and sustainability consultancy.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
6	Mitie Energy	Exact match	London, United KingdomHQ recorded Oct 12, 2026	51-200	126 contacts →
	Exact match “Mitie Energy are an award-winning, UK-based energy, utilities and sustainability solutions business.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
7	AMD Group	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	87 contacts →
	Exact match “AMD Environmental are a collaborative Mechanical and Electrical Design and Build Engineering specialist with a sustainable approach in delivering challenging and bespoke projects…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
8	Sustainable Advantage	Exact match	London, United KingdomHQ recorded Oct 12, 2026	51-200	86 contacts →
	Exact match “Sustainable Advantage partners with Private Equity funds and businesses across the UK, France, and wider Europe.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
9	Alfa Energy An Edison Energy Company	Exact match	London, United KingdomHQ recorded Oct 12, 2026	201-500	83 contacts →
	Exact match “Alfa Energy Group (an Edison Energy company) is an international energy, sustainability and technology consultant partner with 200 employees over four international locations.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
10	Advantage Utilities LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	53 contacts →
	Exact match “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”…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
11	ETUDE	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	48 contacts →
	Exact match “We are a team of sustainability engineers passionate about creating buildings with a positive impact on the environment and the community.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
12	Integration	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	33 contacts →
	Exact match “We’re helping to create a world where every building is truly zero carbon.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
13	Envision	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	33 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
14	Syzygy	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	33 contacts →
	Exact match “Founded in 2010, Syzygy is the leading specialist low carbon technology consultancy for the real estate sector.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
15	Twin And Earth LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	27 contacts →
	Exact match “Twin and Earth is an independent engineering and sustainability consultancy.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
16	RCDC	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	26 contacts →
	Exact match “Building Service and Low Carbon consultancy advice within the Built Environment.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
17	Greenlight	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	23 contacts →
	Exact match “GreenLight is a UK based engineering group established in 2008 that specializes in commercial fit-out, facility management, and renewable energy services with a core focus on…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
18	Zerogram	Exact match	London, United KingdomHQ recorded Oct 12, 2026	1-10	14 contacts →
	Exact match “Zerogram is on a mission to make net zero not just possible, but practical.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
19	Future Energy Partners	Exact match	London, United KingdomHQ recorded Oct 12, 2026	1-10	13 contacts →
	Exact match “ENERGY TRANSITION We provide clean energy options and practical solutions for our clients, and pride ourselves in being a consultancy that is dedicated to delivering today’s…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
20	Flow&ebb LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	11 contacts →
	Exact match “We often talk to people in large businesses who are not getting the support they need to manage their energy costs well.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
21	Kantor Energy Limited	Exact match	London, United KingdomHQ recorded Oct 12, 2026	1,001-5,000	11 contacts →
	Exact match “Kantor Energy offers sustainable engineering services to clients across all sectors.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
22	Mecserve	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	11 contacts →
	Exact match “A MEP Design and Energy + Sustainability Consultancy, we've been “Engineering Exceptional Environment Solutions for Buildings” every day since 1973, working on buildings across…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
23	BTP Consultants	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	10 contacts →
	Exact match “We design mechanical and electrical systems, advise on all aspects of energy, carbon reduction and building physics.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
24	Twenty ONE Engineering	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	10 contacts →
	Exact match “We offer a world leading Energy and Engineering support to our clients.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
25	Kuungana Advisory	Exact match	London, United KingdomHQ recorded Oct 12, 2026	1-10	9 contacts →
	Exact match “Kuungana Advisory is a consulting firm providing energy economics and commercial advisory services to public sector and private sector actors in the energy sector.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “energy efficiency engineers”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 142 energy efficiency engineers based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 1,677 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Energy efficiency engineers based in London, United Kingdom at a glance

As of Oct 12, 2026

56.6%Verified-email coverage

20.9Average contacts per company

1-10Median size (employees)

Oct 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 142 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with London, United Kingdom whose business descriptions match “energy efficiency engineers” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 1,677 professional contacts with verified work emails across the full matched dataset. 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 October 12, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Energy efficiency engineers by metro in the United Kingdom

Energy efficiency engineers in Manchester35

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “energy efficiency engineers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many energy efficiency engineers are there based in London, United Kingdom?

RevenueBase identified 142 company matches for energy efficiency engineers associated with London, United Kingdom as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Dalkia UK tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United Kingdom has the most energy efficiency engineers?

London leads the United Kingdom with 142 company records, followed by Manchester (35) and Leeds (17).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 1,677 professional contacts with verified work emails tracked across these 142 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 12, 2026.

Ready to reach these companies? Verified emails and direct dials for all 142 energy efficiency engineers based in London, United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Energy efficiency engineers by geography

Browse the directory

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.