Company lists · Data refreshed September 2026

Top 25 Ocean energy companies based in the United Kingdom

Name: Ocean energy 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 151 companies tracked

RevenueBase identified 151 ocean energy companies headquartered in the United Kingdom as of September 2026 and tracks 20,826 professional contacts across them, including 7,401 with verified work emails. London is the largest hub.

This list covers ocean energy 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

151Companies

20,826Contacts tracked

7,401Verified emails

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The 25 largest ocean energy companies based in the United Kingdom

Ranked by team size

Top 25 of 151 ocean energy 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 ocean energy 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	Subsea7	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	10001+	12,645 contacts →
	Partial evidence “Subsea7 makes offshore energy transition possible through the continuous evolution of lower-carbon oil and gas and by enabling the growth of renewables and emerging energy.” Source: RevenueBase Database · checked Sep 17, 2026
2	SSE Renewables	Partial evidence	Perth, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,900 contacts →
	Partial evidence “SSE Renewables is a leading developer and operator of renewable energy generation, headquartered in the UK and Ireland, with a growing presence internationally.” Source: RevenueBase Database · checked Sep 17, 2026
3	Lightsource BP	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,114 contacts →
	Partial evidence “Lightsource bp is working to support a future powered by renewable, affordable and reliable energy that benefits our partners, people and planet.” Source: RevenueBase Database · checked Sep 17, 2026
4	Sonnedix	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	563 contacts →
	Partial 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
5	Cubico Sustainable Investments	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	406 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 17, 2026
6	James Fisher And Sons PLC	Partial evidence	Barrow-in-furness, United KingdomHQ checked Sep 17, 2026	1,001-5,000	403 contacts →
	Partial evidence “Above, below and beyond the world’s oceans.” Source: RevenueBase Database · checked Sep 17, 2026
7	Flotation Energy	Partial evidence	Edinburgh, United KingdomHQ checked Sep 17, 2026	51-200	154 contacts →
	Partial evidence “Flotation Energy Ltd delivers clean, green, renewable energy by using our expertise in floating and fixed offshore wind and the energy transition, supporting achievement of…” Source: RevenueBase Database · checked Sep 17, 2026
8	Octopus Energy Generation	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	153 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 17, 2026
9	British Solar Renewables	Partial evidence	Shepton Mallet, United KingdomHQ checked Sep 17, 2026	51-200	148 contacts →
	Partial evidence “Clean energy, powered with purpose.” Source: RevenueBase Database · checked Sep 17, 2026
10	EDF Renewables UK & Ireland	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	117 contacts →
	Partial evidence “EDF Renewables is part of one of the world’s leading renewable energy companies in the UK.” Source: RevenueBase Database · checked Sep 17, 2026
11	Innogy Renewables UK	Partial evidence	Swindon, United KingdomHQ checked Sep 17, 2026	501-1,000	94 contacts →
	Partial evidence “Innogy Renewables UK Ltd is a leading business in the drive to generate more electricity from low carbon, inexhaustable domestic energy sources.” Source: RevenueBase Database · checked Sep 17, 2026
12	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
13	Emec European Marine Energy Centre	Partial evidence	Stromness, United KingdomHQ checked Sep 17, 2026	51-200	69 contacts →
	Partial evidence “Established in 2003, EMEC is the world’s first and leading facility for demonstrating and testing wave and tidal energy converters – technologies that generate electricity by…” Source: RevenueBase Database · checked Sep 17, 2026
14	Aura Power	Partial evidence	Bristol, United KingdomHQ checked Sep 17, 2026	11-50	58 contacts →
	Partial evidence “Aura Power is a renewable energy investor, developer and adviser.” Source: RevenueBase Database · checked Sep 17, 2026
15	NNG Offshore Wind	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 17, 2026	n/a	51 contacts →
	Indirect evidence “The Neart na Gaoithe (NnG) offshore wind farm will be located 15.5 km off the Fife coast and covers an area of approximately 105 km2.” Source: RevenueBase Database · checked Sep 17, 2026
16	Elements Green	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	51 contacts →
	Partial 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
17	Verlume	Partial evidence	Inverurie, United KingdomHQ checked Sep 17, 2026	11-50	48 contacts →
	Partial evidence “Verlume is a leader in intelligent energy management and storage technologies for the energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
18	Haventus	Partial evidence	Ardersier, United KingdomHQ checked Sep 17, 2026	51-200	48 contacts →
	Partial evidence “Haventus is an energy transition facilities provider, offering pivotal infrastructure for the offshore wind industry.” Source: RevenueBase Database · checked Sep 17, 2026
19	Belltown Power	Partial evidence	Bristol, United KingdomHQ checked Sep 17, 2026	11-50	40 contacts →
	Partial evidence “Belltown Power is an international renewable energy company (IPP).” Source: RevenueBase Database · checked Sep 17, 2026
20	Reventus Power	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	39 contacts →
	Indirect evidence “Reventus Power originates and invests in the development and long-term management of offshore wind projects globally.” Source: RevenueBase Database · checked Sep 17, 2026
21	Nova Innovation	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 17, 2026	11-50	38 contacts →
	Indirect evidence “Nova are specialists in floating solar EPC and consultancy.” Source: RevenueBase Database · checked Sep 17, 2026
22	Brockwell Energy Limited	Partial evidence	Edinburgh, United KingdomHQ checked Sep 17, 2026	11-50	38 contacts →
	Partial evidence “Brockwell Energy is a leading multi-technology Independent Power Producer (IPP), dedicated to renewable energy infrastructure.” Source: RevenueBase Database · checked Sep 17, 2026
23	Orbital Marine Power LTD	Indirect evidence	Kirkwall, United KingdomHQ checked Sep 17, 2026	11-50	36 contacts →
	Indirect evidence “Orbital Marine Power is an innovative Scottish engineering company focused on the development of a low-cost, predictable, scalable floating tidal stream technology.” Source: RevenueBase Database · checked Sep 17, 2026
24	Jera NEX	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	33 contacts →
	Partial evidence “JERA Nex is an renewable energy developer launched by JERA, Japan's largest power generation company.” Source: RevenueBase Database · checked Sep 17, 2026
25	Marine Power Systems LTD MPS	Indirect evidence	Swansea, United KingdomHQ checked Sep 17, 2026	11-50	30 contacts →
	Indirect evidence “Marine Power Systems’ core platform solution, PelaFlex, includes both hybrid and fully floating variants, designed to operate across a wide range of water depths.” 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: ocean energy 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 ocean energy companies.
Partial evidence: Its own public description names part of ocean energy companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ocean energy 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 151 ocean energy companies based in the United Kingdom

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Ocean energy companies based in the United Kingdom at a glance

As of Sep 17, 2026

35.5%Verified-email coverage

137.9Average contacts per company

11-50Median size (employees)

32.5%Largest-city concentration · London

Sep 17, 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

10001+

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 151 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 ocean energy 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 “ocean energy 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 ocean energy 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 ocean energy 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, 7,401 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.

Ocean energy companies by metro

Ocean energy companies in London49

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 ocean energy 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 ocean energy companies are there based in the United Kingdom?

RevenueBase identified 151 ocean energy 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?

Subsea7, headquartered in London, tops this list with the largest team on record.

Which city has the most ocean energy companies?

London leads with 49 headquartered companies, followed by Edinburgh (14) and Bristol (4).

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 7,401 verified decision-maker contacts tracked across these 151 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.