Company lists · Data refreshed September 2026

Top 25 Energy systems integration firms based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 161 companies tracked

RevenueBase identified 161 energy systems integration firms headquartered in London, United Kingdom as of September 2026 and tracks 3,352 professional contacts across them, including 1,844 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers energy systems integration 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 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 28, 2026 86% judged on-target in blind review

161Companies

3,352Contacts tracked

1,844Verified emails

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The 25 largest energy systems integration firms based in London, United Kingdom

Ranked by team size

Top 25 of 161 energy systems integration firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to energy systems integration firms: 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	Dalkia UK	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
2	Kaluza	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	501-1,000	595 contacts →
	Partial evidence “Kaluza is the Energy Intelligence Platform, turning energy complexity into seamless coordination.” Source: RevenueBase Database · checked Sep 28, 2026
3	Reon Energy Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
4	IO Consulting	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	92 contacts →
	Strong evidence “io is a project architect and systems integrator dedicated to empowering the energy transition through innovative and independent consulting services across all Front-End Loading…” Source: RevenueBase Database · checked Sep 28, 2026
5	Alfa Energy An Edison Energy Company	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
6	Innova	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	77 contacts →
	Partial evidence “Innova is a forward-thinking renewable energy business, employing people across two offices in London and Cheltenham.” Source: RevenueBase Database · checked Sep 28, 2026
7	Energy Drive	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	60 contacts →
	Partial evidence “We help heavy industry like steel become more energy efficient through the deployment of intelligent MV motor control via a zero-capex model: guaranteed net savings for the…” Source: RevenueBase Database · checked Sep 28, 2026
8	Elements Green	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	51 contacts →
	Strong evidence “Elements Green (EG) is a leading renewable energy developer headquartered in London, specialising in utility-scale solar PV systems and battery energy storage solutions.” Source: RevenueBase Database · checked Sep 28, 2026
9	Powerverse	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	50 contacts →
	Partial evidence “Powerverse is a smart energy management company committed to creating a more affordable, connected electric future.” Source: RevenueBase Database · checked Sep 28, 2026
10	Voltwise Power	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	42 contacts →
	Partial evidence “Voltwise develops, owns and operates flexible energy storage solutions that allow rapid deployment of renewables.” Source: RevenueBase Database · checked Sep 28, 2026
11	Natpower UK	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	38 contacts →
	Strong evidence “NatPower UK has the largest clean energy development programme in the UK, aiming at integrating large scale smart clean energy generation and distribution with large scale…” Source: RevenueBase Database · checked Sep 28, 2026
12	Link Media Systems	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	37 contacts →
	Partial evidence “We are systems integrators.” Source: RevenueBase Database · checked Sep 28, 2026
13	Pulse Clean Energy	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	35 contacts →
	Partial evidence “Through innovation in energy storage and optimisation, we will help to enable an energy network that runs entirely on renewables.” Source: RevenueBase Database · checked Sep 28, 2026
14	Integration	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	34 contacts →
	Indirect evidence “We’re helping to create a world where every building is truly zero carbon.” Source: RevenueBase Database · checked Sep 28, 2026
15	Okto Technologies	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	32 contacts →
	Partial evidence “Master Systems Integrator OKTO Technologies is a leader in the design, development & installation of Smart Building Technology for- SuperPrime Residential - Luxury Hospitality -…” Source: RevenueBase Database · checked Sep 28, 2026
16	Powervault	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	30 contacts →
	Partial evidence “At Powervault, we are on a mission to pioneer a sustainable energy future.” Source: RevenueBase Database · checked Sep 28, 2026
17	Torpedo Factory Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	27 contacts →
	Partial evidence “AMAZING DIGITAL EXPERIENCES THAT WOW BY DESIGN Torpedo Factory Group is a Master Systems Integrator providing professional services for Intelligent Environments & Smart Buildings…” Source: RevenueBase Database · checked Sep 28, 2026
18	Queequeg Renewables	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	26 contacts →
	Partial evidence “We are an integrated platform developing utility-scale energy facilities in multiple territories.” Source: RevenueBase Database · checked Sep 28, 2026
19	M.P.E. Power System Consultants	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	25 contacts →
	Indirect evidence “M.P.E.” Source: RevenueBase Database · checked Sep 28, 2026
20	Renewable Connections	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	21 contacts →
	Partial evidence “Renewable Connections deliver highly innovative renewable energy developments in strategic locations across the UK and beyond.” Source: RevenueBase Database · checked Sep 28, 2026
21	QQ Solutions LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Strong evidence “QQ design, supply and install of residental and commercial automation technology and energy-efficient control systems.” Source: RevenueBase Database · checked Sep 28, 2026
22	Envirolec Smart Energy Solutions	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “With over 70 years combined industry experience, Envirolec Smart Energy Solutions has gained vital expertise and experience in a number of Renewable Technologies.” Source: RevenueBase Database · checked Sep 28, 2026
23	Matrica	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Strong evidence “We provide energy consultancy, data management, energy demand management and general forecasting systems for the power, gas and renewable sectors.” Source: RevenueBase Database · checked Sep 28, 2026
24	Accurro LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	14 contacts →
	Partial evidence “Founded in 2002, Accurro was originally set up to be a commercial building management systems controls company.” Source: RevenueBase Database · checked Sep 28, 2026
25	Basepower	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Partial evidence “BasePower develops and operates energy services that help UK plc to operate profitably and grow through the carbon transition.” Source: RevenueBase Database · checked Sep 28, 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: energy systems integration firms. 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 energy systems integration firms.
Partial evidence: Its own public description names part of energy systems integration firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy systems integration firms. 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 161 energy systems integration firms based in London, United Kingdom

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Energy systems integration firms based in London, United Kingdom at a glance

As of Sep 28, 2026

55.0%Verified-email coverage

20.8Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 161 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 energy systems integration firms, 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 London, United Kingdom whose own description of what they do matches “energy systems integration firms”. 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 energy systems integration firms), 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 energy systems integration 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 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, 1,844 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 28, 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.

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 energy systems integration firms, 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 energy systems integration firms are there based in London, United Kingdom?

RevenueBase identified 161 energy systems integration 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?

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

Which city in the United Kingdom has the most energy systems integration firms?

London leads the United Kingdom with 161 headquartered companies, followed by Nottingham (21) and Glasgow (20).

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 1,844 verified decision-maker contacts tracked across these 161 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 28, 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.