UK battery storage developer Eelpower Energy has acquired the 50MW/100MWh Stoneworthy battery energy storage system (BESS) project in Devon from renewable energy company Renewable Energy Systems (RES).
Construction of the project, located south of the Pyworthy substation in Devon, is planned for 2027 with commercial operations expected in 2028. Financial terms of the acquisition were not disclosed.
Once operational, the Stoneworthy project will add 100 MWh of storage capacity to Eelpower Energy’s growing pipeline as the company aims to achieve more than 1 GW of grid-scale battery assets in the coming years.
“Stoneworthy is an important acquisition for Eelpower Energy and a strong addition to our growing battery storage portfolio. It demonstrates our ability to create and execute compelling opportunities with high-quality counterparties such as RES, while underscoring the commitment of Equitix, Aware Super and the National Wealth Fund to invest in the infrastructure needed for a cleaner, more flexible and more resilient electricity system in Britain,” said Mark Simon, CEO of Eelpower Energy.
Eelpower was advised on the transaction by Burges Salmon as legal advisor, Everoze for technical due diligence, Roadnight Taylor for network matters and Eight Advisory for financial and tax due diligence.
The company said the investment strategy is in line with the The UK government’s Clean Power 2030 ambitionswith battery storage expected to play a central role in supporting the integration of renewable energy sources, balancing the electricity grid and improving system flexibility.
This is the company’s fourth asset acquisition since its launch in September 2025. It is part of Eelpower Energy’s wider strategy to build a distributed portfolio of network-scale storage assets in Britain.
The company, backed by infrastructure investor Equitix, Australian pension fund Aware Super and the UK’s National Wealth Fundplans to invest £500 million in flexible battery storage in the UK market.
