Danish investment firm AIP Management has agreed to acquire a 49% interest in a UK-based battery energy storage portfolio totalling 700 megawatts (MW) and 2 gigawatt-hours (GWh), the company said on Wednesday.
The portfolio is being developed in partnership with BW ESS, which will retain a 51% majority stake through a newly formed asset company. BW ESS will continue to oversee construction and operational management of the assets.
The transaction includes the 100MW/331MWh Bramley battery storage project, which is already operational, as well as two larger sites currently under construction—Hams Hall (400MW/1,422MWh) and Berkswell (200MW/712MWh).
Once complete, the portfolio is expected to provide flexible power capacity capable of supplying electricity to approximately 2.3 million UK homes for 3.5 hours, helping to mitigate grid constraints and support system reliability amid rising renewable penetration.
The assets are strategically located in the Midlands and South-East of England, in proximity to major demand centres and National Grid substations, which AIP said would help reduce congestion risks and improve access to grid services.
Revenue will be backed by capacity market contracts and long-term offtake agreements, which AIP said will “provide cash flow stability while preserving upside potential.”
Completion of the transaction remains subject to regulatory approvals. Financial terms of the deal were not disclosed.
