Company lists · Data refreshed September 2026

Top 25 Long duration energy storage companies based in the United Kingdom

Name: Long duration energy storage 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 17, 2026 212 companies tracked

RevenueBase identified 212 long duration energy storage companies headquartered in the United Kingdom as of September 2026 and tracks 8,860 professional contacts across them, including 4,189 with verified work emails. London is the largest hub.

This list covers long duration energy storage 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 17, 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 17, 2026 86% judged on-target in blind review

212Companies

8,860Contacts tracked

4,189Verified emails

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The 25 largest long duration energy storage companies based in the United Kingdom

Ranked by team size

Top 25 of 212 long duration energy storage companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to long duration energy storage 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	RES	Strong evidence	Kings Langley, United KingdomHQ checked Sep 17, 2026	1,001-5,000	3,721 contacts →
	Strong evidence “RES is the world’s largest independent renewable energy company, working across 24 countries and active in wind, solar, energy storage, green hydrogen, transmission, and…” Source: RevenueBase Database · checked Sep 17, 2026
2	SMS PLC	Partial evidence	Glasgow, United KingdomHQ checked Sep 17, 2026	1,001-5,000	766 contacts →
	Partial evidence “Through our range of innovative energy solutions, we are delivering the future of smart energy – working closely with private and public sector partners to decarbonise the UK…” Source: RevenueBase Database · checked Sep 17, 2026
3	Sonnedix	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	563 contacts →
	Strong evidence “Sonnedix is a global renewable energy company delivering 100% clean electricity directly to customers through a diversified portfolio of solar, wind, and storage assets.” Source: RevenueBase Database · checked Sep 17, 2026
4	Zenobē	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	336 contacts →
	Partial evidence “We're Zenobē Energy and we're on a mission to make clean power accessible.” Source: RevenueBase Database · checked Sep 17, 2026
5	Intec Energy Solutions	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	242 contacts →
	Strong 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 17, 2026
6	Ethical Power	Indirect evidence	Exeter, United KingdomHQ checked Sep 17, 2026	51-200	231 contacts →
	Indirect evidence “Ethical Power Group launched in the UK in 2010.” Source: RevenueBase Database · checked Sep 17, 2026
7	FIELD	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	179 contacts →
	Partial evidence “We're creating the renewable energy infrastructure and trading company of the future.” Source: RevenueBase Database · checked Sep 17, 2026
8	Invinity Energy Systems	Strong evidence	Liverpool Street, United KingdomHQ checked Sep 17, 2026	51-200	159 contacts →
	Strong evidence “Invinity Energy Systems plc (AIM:IES) manufactures vanadium flow batteries for the large-scale energy storage requirements of businesses, industry and electricity networks.” Source: RevenueBase Database · checked Sep 17, 2026
9	Cero Generation	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	145 contacts →
	Strong evidence “We’re focused on developing and delivering utility-scale solar and battery energy storage system (BESS) projects that power the transition to a cleaner, more resilient energy…” Source: RevenueBase Database · checked Sep 17, 2026
10	Statera Energy	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	142 contacts →
	Strong evidence “Statera Energy is a UK-based energy company that develops, owns, and operates flexible generation, battery storage, pumped hydro and green hydrogen projects.” Source: RevenueBase Database · checked Sep 17, 2026
11	Habitat Energy	Strong evidence	Oxford, United KingdomHQ checked Sep 17, 2026	11-50	114 contacts →
	Strong evidence “Habitat Energy provide a state-of-the-art optimisation and trading platform for grid-scale battery storage and renewables in the UK, US, and Australia.” Source: RevenueBase Database · checked Sep 17, 2026
12	Givenergy	Indirect evidence	Newcastle Under Lyme, United KingdomHQ checked Sep 17, 2026	51-200	101 contacts →
	Indirect evidence “GivEnergy – No.” Source: RevenueBase Database · checked Sep 17, 2026
13	EKU Energy	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	87 contacts →
	Partial evidence “Eku Energy is a specialist, technology-enabled developer dedicated to accelerating the energy transition.” Source: RevenueBase Database · checked Sep 17, 2026
14	Ampyr Solar Europe	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	82 contacts →
	Indirect evidence “Headquartered in London, AMPYR Solar Europe (ASE) is an independent renewable asset developer and IPP active in Germany, the Netherlands and the UK.” Source: RevenueBase Database · checked Sep 17, 2026
15	Sunamp	Strong evidence	Edinburgh, United KingdomHQ checked Sep 17, 2026	51-200	79 contacts →
	Strong evidence “Sunamp’s space-saving thermal energy storage uses patented phase change materials to make homes and buildings more energy-efficient and sustainable.” Source: RevenueBase Database · checked Sep 17, 2026
16	Innova	Partial evidence	London, United KingdomHQ checked Sep 17, 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 17, 2026
17	Enviromena	Indirect evidence	Reading, United KingdomHQ checked Sep 17, 2026	51-200	75 contacts →
	Indirect evidence “Enviromena is an independent power producer operating across the UK and Europe.” Source: RevenueBase Database · checked Sep 17, 2026
18	Harmony Energy	Strong evidence	Knaresborough, United KingdomHQ checked Sep 17, 2026	51-200	73 contacts →
	Strong evidence “Founded in 2010, Harmony Energy is one of the UK’s leading developers, owners and operators of utility-scale battery energy storage.” Source: RevenueBase Database · checked Sep 17, 2026
19	Elements Green	Strong evidence	London, United KingdomHQ checked Sep 17, 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 17, 2026
20	Ylem Energy	Partial evidence	Manchester, United KingdomHQ checked Sep 17, 2026	51-200	51 contacts →
	Partial evidence “YLEM Energy is a leading independent power generation specialist with more than three decades’ experience in building, owning and operating smart generation systems.” Source: RevenueBase Database · checked Sep 17, 2026
21	Island Green Power	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	48 contacts →
	Partial evidence “Island Green Power specialises in the development of utility-scale solar projects and battery storage systems with operations across the UK, Spain, Italy, Australia and New…” Source: RevenueBase Database · checked Sep 17, 2026
22	Verlume	Strong evidence	Inverurie, United KingdomHQ checked Sep 17, 2026	11-50	48 contacts →
	Strong evidence “Verlume is a leader in intelligent energy management and storage technologies for the energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
23	Connected Energy	Strong evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 17, 2026	11-50	44 contacts →
	Strong evidence “Connected Energy is a world leader in battery energy storage.” Source: RevenueBase Database · checked Sep 17, 2026
24	Noriker Power LTD	Partial evidence	Cheltenham, United KingdomHQ checked Sep 17, 2026	51-200	43 contacts →
	Partial evidence “With rocketing fossil energy prices driving a cost of living crisis, the renewable energy transition has never been in greater focus.” Source: RevenueBase Database · checked Sep 17, 2026
25	Voltwise Power	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	42 contacts →
	Strong evidence “Voltwise develops, owns and operates flexible energy storage solutions that allow rapid deployment of renewables.” Source: RevenueBase Database · checked Sep 17, 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: long duration energy storage 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 long duration energy storage companies.
Partial evidence: Its own public description names part of long duration energy storage companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name long duration energy storage 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 212 long duration energy storage companies based in the United Kingdom

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Long duration energy storage companies based in the United Kingdom at a glance

As of Sep 17, 2026

47.3%Verified-email coverage

41.8Average contacts per company

11-50Median size (employees)

36.8%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

100

11-50

51-200

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 212 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 long duration energy storage 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 “long duration energy storage 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 long duration energy storage 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 long duration energy storage 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, 4,189 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 17, 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.

Long duration energy storage companies by metro

Long duration energy storage companies in London78

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 long duration energy storage 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 long duration energy storage companies are there based in the United Kingdom?

RevenueBase identified 212 long duration energy storage 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?

RES, headquartered in Kings Langley, tops this list with the largest team on record.

Which city has the most long duration energy storage companies?

London leads with 78 headquartered companies, followed by Cambridge (5) and Edinburgh (5).

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 4,189 verified decision-maker contacts tracked across these 212 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 17, 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.