EDF and Trinasolar ISBU sign two long-term battery opimisation agreements
- EDF has signed two battery energy storage system (BESS) projects developed by Trinasolar ISBU
- The projects will deliver a combined 179.8MWh of storage capacity, enough to meet the peak electricity needs of tens of thousands of homes for up to two hours
- The assets will support system flexibility, grid stability and the integration of low-carbon generation across Great Britain
EDF has signed two battery optimisation agreements with Trinasolar International Solution Business Unit (“ISBU”), covering a portfolio of new grid-scale battery energy storage projects located in England and Scotland.
Under the agreements, EDF will use its advanced Powershift platform to manage the assets. This digital trading and optimisation system will provide long-term revenue certainty for Trinasolar ISBU while enabling the projects to deliver essential flexibility services to the UK electricity system.
The agreements cover two battery projects: the Ruby BESS project near Aberdeen, a 40MW / 80MWh facility scheduled to become operational in October 2026 and the Chatterley BESS project in Gloucestershire, a 49.9MW / 99.8MWh asset expected to reach commercial operation in March 2027. Both projects are designed with two hours of storage duration and will provide flexible capacity to support local and national grid requirements.
By storing electricity during periods of lower demand and releasing it when demand is higher, the Chatterley and Ruby projects will support grid stability, help manage price volatility and enable greater integration of low-carbon electricity. Long-term optimisation agreements such as these also help provide the revenue certainty needed to support continued investment in flexible energy infrastructure across Great Britain.
Stuart Fenner, Commercial Director of Business & Wholesale Services at EDF, said: “As renewable generation and electrification continue to grow, flexible assets such as battery storage are becoming increasingly important to maintaining system stability. We’re pleased to be working with Trinasolar ISBU to optimise both projects and help unlock the flexibility needed to support Britain’s transition to a low carbon, electrified energy system.”
Leonardo Lotti at Trinasolar ISBU, said: “Following our acquisition of the Ruby and Chatterley projects, we are proud to be partnering with EDF as an important next step in maximising their long‑term value. Through this collaboration, we can invest with confidence while ensuring the projects are operated effectively to deliver strong commercial outcomes and meaningful benefits for the wider energy system.”
The Ruby and Chatterley projects form part of EDF’s growing battery storage portfolio in Great Britain, reflecting the increasing role of energy storage in delivering a secure, flexible and low-carbon electricity system.
About EDF
EDF is driving the transition towards An Electric Britain – a secure, affordable, low-carbon future for everyone. As Britain’s biggest generator of zero carbon electricity, we are investing more than £100 million weekly in Britain’s electricity infrastructure. We supply millions of customers with electricity and help homes and businesses switch to electricity for heating, transport and industrial processes.
We operate five nuclear power stations and more than 35 onshore wind farms and three offshore wind farms. Since 2009, EDF has invested almost £9 billion in the nuclear fleet to improve reliability and extend station lifetimes. The five generating stations currently supply about 12% of the UK’s electricity demand.
EDF is building the UK's nuclear renaissance with the construction of a new nuclear power station at Hinkley Point C. We are a minority investor (12.5%) in and major supplier to a replica plant at Sizewell C in Suffolk. Hinkley Point C and Sizewell C will provide low carbon electricity to meet 14% of UK demand and power around 12 million homes. EDF Group companies Framatome and Arabelle Solutions have a presence in the UK and manufacture critical equipment such as reactor pressure vessels and turbines.
EDF is enabling its 5 million customers, both in business and at home, to choose electric solutions that save cash and carbon, whether it is buying an electric car, generating and storing electricity, selling energy back to the grid or installing solar panels or a heat pump. In 2025, EDF’s Customers business was ranked as one of the Sunday Times’s Best Place to Work.
It is also one of the UK’s leading developers of renewable energy through EDF power solutions UK and Ireland. We have more than 2GW of renewable generation in operation and over 10GW in construction, planning and development across a range of technologies including onshore and offshore wind, solar and battery storage.
We are one of the largest suppliers to British business and a leading supplier of innovative energy solutions that are helping businesses become more energy independent. In addition, the company’s energy services business, Dalkia, is one of the UK and Ireland’s largest technical service providers.
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