Chart: Which BESS providers have supplied which UK developers?

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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.

13 October 2026
London, UK
Now in its second edition, the Summit provides a dedicated platform for UK & Ireland’s BESS community to share practical insights on performance, degradation, safety, market design and optimisation strategies. As storage deployment accelerates towards 2030 targets, attendees gain the tools needed to enhance returns and operate resilient, efficient assets.
3 November 2026
Málaga, Spain
Understanding technology and supplier selection for Europe’s utility-scale PV market in 2027. PV ModuleTech Europe 2026 is a two-day conference that tackles these challenges directly, with an agenda that addresses all aspects of PV module, inverter and battery supplier selection; product availability, technology offerings, supply chain traceability, quality assurance, factory auditing, system reliability, and supplier bankability.
2 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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