AIP acquires 49% stake in BW ESS UK storage portfolio for nearly US$900 million

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Asset manager AIP Management has bought a 49% stake in a 2.4GWh UK portfolio from global BESS investment platform BW ESS for a deal in excess of £650 million (US$873 million).

A source close to the deal confirmed that its enterprise value is more than £650 million, and pertains to a battery energy storage system (BESS) portfolio with a capacity of 700MW and a 3.5-hour duration, split across three projects: the 100MW/331MWh Bramley project, the 400MW/1,422MWh Hams Hill project and the 200MW/712MWh Berkswell project. 

The Bramley project started operations in February, with the remainder of the portfolio currently under construction.

Greg Falzon, partner and co-head of investments at AIP, said the deal “reflects our conviction in the UK energy storage market.”

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The transferred stake will be held by a newly-formed entity, AssetCo, while BW ESS will retain the remaining 51% of the portfolio, once the transaction completes customary approvals. BW ESS’ total pipeline now stands at 500MWh of operational BESS, alongside a further 3.3GWh under construction.

“This investment reflects our conviction in the UK energy storage market and builds on the knowledge we have developed through our existing investments in co-located BESS,” said Greg Falzon, partner and co-head of investments at AIP. “Together we will deliver long-term value while enabling the deployment of critical flexibility in the UK power system.”

See the original full version of this article on Solar Power Portal.

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.
22 February 2027
InterContinental London - The O2, London, UK
The Future of Energy Storage Starts Here Three days in London where developers, IPPs, investors, utilities and the manufacturers building the technology come to close deals, not swap business cards. If you need to be in the room with the people deploying capital into European storage, this is that room.

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