Wärtsilä and EDF Renewables UK & Ireland have expanded their long-term partnership with the launch of two new energy storage projects, further supporting the United Kingdom’s progress towards its clean power goals by 2030. The new projects bring Wärtsilä’s total contribution to eight battery storage sites for EDF Renewables, delivering a total of 404.5 MW / 709 MWh of energy storage capacity across the UK.
Construction has commenced on the two new sites—Indian Queens in Cornwall and Bredbury in Greater Manchester—adding to a portfolio that already includes six operational energy storage projects. The 50 MW / 100 MWh Bredbury facility is expected to be completed by late 2025, while Indian Queens (47.5 MW / 95 MWh) is scheduled to go online in the first half of 2026.
The recently completed projects include the Sundon site (50 MW / 100 MWh) in Bedfordshire, which began commercial operations in December 2024, and the Bramford site (57 MW / 114 MWh) in Suffolk, operational since April 2025.
“Battery energy storage has a huge role to play in enabling the UK’s clean energy transition. This vital technology helps make the most of electricity generated by renewables, like wind and solar, while also improving grid reliability. Our partnership with Wärtsilä helps us to optimise our grid-scale projects,” said Simone Sullivan, Head of Storage, EDF Renewables. “By harnessing the power of data, we can provide stability to the grid, with batteries that are performing as efficiently and predictably as possible. Making sure that the UK’s essential energy storage capacity is operating to its full potential reduces energy waste and ultimately ensures the fastest, most efficient transition to clean power.”
All eight projects are supported by Wärtsilä’s long-term service agreements, which aim to ensure optimal system performance, improve operational efficiency, and provide cost predictability. The Sundon, Bramford, Indian Queens, and Bredbury projects are covered under these agreements, which include guaranteed performance levels and support from a dedicated service team.
“Together with EDF Renewables, we are enhancing the reliability and flexibility of the UK’s energy system—delivering tangible progress toward a 100% renewable energy future. Our long-term service agreements further reinforce this commitment by ensuring performance, minimising operational risks, and maximising lifecycle value,” said Chris Wolf, Sales Director for Europe at Wärtsilä Energy Storage.
All eight battery energy storage sites are also integrated with Wärtsilä’s GEMS control and optimisation software. GEMS provides EDF Renewables with data-driven insights to manage assets, optimise performance, and enhance market trading capabilities. The system enables revenue generation through grid services such as frequency response and market participation, while also reinforcing grid stability.
