EDF signs landmark long-term floor pricing agreements with Gresham House Energy Storage Fund
- Covers 737MW of battery storage, including both operations and development assets
- Agreement provides long-term revenue certainty, supporting growth of the UK’s battery storage sector
- Brings together the UK’s largest operational battery asset owner and leading Route-to-Market provider to drive value from clean energy infrastructure
EDF, Britain’s biggest generator of zero carbon electricity has entered into long-term floor pricing agreements with Gresham House Energy Storage Fund plc (GRID), the UK’s largest owner of operational battery energy storage systems (BESS).
GRID has selected EDF to optimise several of its battery assets and entered into these long-term agreements to provide enhanced revenue stability. The landmark agreement covers 737MW of BESS projects, including 100 MW currently operational and 637MW in development. It brings together two of the largest names in the sector: EDF, the UK’s leading Route-to-Market (RtM) provider, and GRID, the country’s largest operational battery asset owner and a pioneer in battery storage investment.
The agreements provide GRID with predictable income base while allowing the company to benefit from potential rises in wholesale energy market prices. Both EDF and Gresham House Energy Storage Fund share a strong belief in the critical role of BESS in optimising the UK electricity grid. EDF will optimise all sites using its proprietary Powershift platform, which delivers value across the Wholesale Market, Balancing Mechanism, and Ancillary Services, while providing the National Electricity System Operator (NESO) with vital, fast-acting reserve capacity.
EDF plays a key role in enabling the growth of large-scale energy storage in the UK by helping balance supply and demand. This supports a more efficient and resilient energy system. The collaboration with Gresham House reflects both companies’ focus on are scaling battery storage, their shared interest in long-term, value-driven partnerships, and a strong belief in the critical role of battery energy storage systems (BESS) in optimising the UK electricity grid.
Ben Guest, Fund Manager at Gresham House Energy Storage Fund, commented:
“We are delighted to announce the signing of these Floor Agreements with EDF, the UK’s largest battery optimiser, and we look forward to working closely with EDF over the life of these contracts. The floor agreements mark the completion of another key milestone for GRID, significantly improving the risk profile of the Company and fundamentally reposition GRID as a business with significant minimum contracted revenue while retaining merchant upside.”
Stuart Fenner, Wholesale Market Services, Commercial Director at EDF said:
“We’re pleased to partner with Gresham House in a new long-term agreement that supports the continued rollout of battery storage across the UK. The deal reflects the ambition, and expertise both parties bring to the energy transition. At EDF, we are committed to being a reliable partner and look forward to delivering value through our trading expertise and Balance Mechanism capabilities.”
This venture positions EDF and Gresham House at the forefront of the energy storage sector, a vital pillar of the UK’s Net Zero future. It also exemplifies how market-leading scale, trusted partnerships, and complementary competencies are critical for success in today’s dynamic energy landscape.
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, one of the UK and Ireland’s largest technical service providers.
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