Eelpower Energy, backed by Equitix, Aware Super and the National Wealth Fund, has completed its fourth asset acquisition with the purchase of the 50MW/100MWh Stoneworthy battery energy storage project in Devon from RES. This step is the next in the company’s plan to build a large and distributed portfolio of grid-scale flexible storage assets across Great Britain.
Construction of the Stoneworthy battery energy storage system (BESS), located on land south of the Pyworthy substation in Devon, will commence next year (2027) with commercial operations expected to start in 2028.
As Eelpower Energy’s fourth asset acquisition since the formation of the company in September 2025, Stoneworthy marks an important milestone in the build-out of its broader portfolio. The acquisition of this high-quality project from RES, the world’s largest independent renewable energy company, is a further step forward in Eelpower Energy’s plan to invest £500m in flexible BESS assets in Great Britain, supporting the UK’s energy transition and the UK’s Clean Power 2030 goals by enabling a more flexible, resilient, and decarbonised electricity system.
Eelpower Energy is aiming to build, own and operate over 1GW of grid-scale battery assets in the coming years with a view to becoming a leading owner-operator of flexibility on the GB electricity system.
Mark Simon, Chief Executive of Eelpower Energy said: “Stoneworthy is an important acquisition for Eelpower Energy and a strong addition to our growing battery storage portfolio. It demonstrates our ability to originate and execute attractive opportunities with high-quality counterparties such as RES, while underlining the commitment of Equitix, Aware Super and the National Wealth Fund to investing in the infrastructure needed for a cleaner, more flexible and more resilient electricity system in Great Britain.”
RES has more than 40 years of experience across the development, engineering, construction and operation of renewable energy and energy storage projects.
Lucy Whitford, RES’ Managing Director, UK&I, said:“We are pleased to have completed the sale of the Stoneworthy BESS project to Eelpower, marking our first transaction together. Stoneworthy BESS will play an important role by helping to deliver a reliable, resilient electricity system for the future.”
Eelpower Energy was advised by Burges Salmon (legal counsel), Everoze (technical due diligence), Roadnight Taylor (grid consultants) and Eight Advisory (finance / tax).