Chart: Which BESS providers have supplied which UK developers?

July 31, 2025
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We look at which BESS suppliers have supplied which UK project owner-operators, with data from our Solar Media Market Research colleagues.

The UK now has around 7GW/10GWh of grid-scale battery energy storage system (BESS) capacity online, according to the Battery Storage: UK Pipeline & Completed Assets Database report from Solar Media Market Research.

The infographic below illustrates which suppliers and system integrators have supplied which final developers, though only for operational projects that are 49MWh or higher.

Each line represents a relationship, and some companies have supplied multiple projects.

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By projects deployed, the largest providers are Tesla, CATL, Wärtsilä and Sungrow.

However over a node next to the name to see all a company’s relationships: the node next to the supplier for all their customers, and the node next to the developer to see all its suppliers (again, only for projects of 49MWh and above).

Note that the data doesn’t include projects where the BESS supplier or integrator was not publicly revealed or where Solar Media Market Research analysts were not able to obtain the information via proprietary research.

Research comes from press releases, certain documents within planning applications, and analyst relationships within the market to get non-publicly available data.

The Database also covers the long-term pipeline of BESS projects that are under construction, submitted for planning approval or with planning consent in place, which now totals 63,243MW/131,834MWh of capacity. We publish monthly updates on the latest dataset for ESN Premium.

24 February 2026
InterContinental London - The O2, London, UK
This isn’t just another summit – it’s our biggest and most exhilarating Summit yet! Picture this: immersive workshop spaces where ideas come to life, dedicated industry working groups igniting innovation, live podcasts sparking lively discussions, hard-hitting keynotes that will leave you inspired, and an abundance of networking opportunities that will take your connections to new heights!
9 June 2026
Stuttgart, Germany
Held alongside The Battery Show Europe, ESS Germany — Stuttgart Edition provides a focused platform to understand the policies, revenue models and deployment conditions shaping Germany’s utility-scale storage boom. With contributions from TSOs, banks, developers and optimisers, the Summit explores regulation, merchant strategies, financing, grid tariffs and project delivery in a market forecast to integrate 24GW of storage by 2037.
1 December 2026
Italy
Battery Asset Management Summit Europe is the annual meeting for owners, operators, investors, and optimisation specialists working with operational BESS assets across the continent. The Summit focuses on how to maximise performance and revenue, manage degradation, integrate advanced optimisation software, navigate evolving market and regulatory frameworks, and plan for repowering or end-of-life strategies. With insights from Europe’s most active storage markets, it equips attendees with practical guidance to run resilient, profitable battery portfolios as the sector scales.

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