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

October 6, 2025
LinkedIn
Twitter
Reddit
Facebook
Email

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.”

This article requires Premium SubscriptionBasic (FREE) Subscription

Try Premium for just $1

  • Full premium access for the first month at only $1
  • Converts to an annual rate after 30 days unless cancelled
  • Cancel anytime during the trial period

Premium Benefits

  • Expert industry analysis and interviews
  • Digital access to PV Tech Power journal
  • Exclusive event discounts

Or get the full Premium subscription right away

Or continue reading this article for free

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.

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, Energy Storage Summit 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.

Read Next

December 18, 2025
Finland’s largest BESS to date will need to cope with “especially challenging” operating conditions and stringent and evolving grid code requirements.
December 17, 2025
It’s been a busy few weeks in the run-up to Christmas in Europe’s BESS project space, with M&A, final investment decisions (FID) and supplier deals in Germany, Belgium, Portugal, Italy, Finland, Romania and the UK totally around 800MW of capacity.
December 17, 2025
Renewable energy companies Akuo Energy and Voltalia have begun constructing projects in French overseas territories.
December 15, 2025
Trade association Energy Storage Europe (ESE) has welcomed proposed reforms to European Union (EU) grid connection and permitting processes.
December 15, 2025
A new battery energy storage system (BESS) cybersecurity whitepaper from consultancy firm The Brattle Group and cybersecurity solutions provider Dragos claims that a single 100MW/400MWh BESS outage could result in US$1.2 million in monthly losses.