Wärtsilä and EDF Renewables Launch New Energy Storage Projects to Support UK’s Net-Zero Goals

Wärtsilä and EDF Renewables Propel Energy Storage Milestones for a Net-Zero UK
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Wärtsilä Corporation has expanded its long-standing partnership with EDF Renewables UK and Ireland to accelerate the United Kingdom’s journey toward clean energy by 2030. Construction has commenced on two new projects, adding to an existing portfolio of six energy storage initiatives. In total, Wärtsilä will deliver eight sites for EDF Renewables, offering a combined energy storage capacity of 404.5 MW / 709 MWh across the UK.

Recently, Wärtsilä completed the fifth and sixth grid-scale battery energy storage projects and signed additional long-term service agreements to enhance performance and reliability across all systems. Simone Sullivan, Head of Storage at EDF Renewables, emphasized the critical role of battery energy storage in facilitating the UK’s clean energy transition. “This essential technology maximizes the use of renewable energy generated from sources like wind and solar while improving grid reliability,” she stated. “Our collaboration with Wärtsilä allows us to optimize our grid-scale projects. By leveraging data, we can ensure that the grid remains stable, with batteries operating as efficiently and predictably as possible, thus minimizing energy waste and ensuring a swift transition to clean power.”

As of now, six out of the eight facilities are operational. The recently completed projects include the 50 MW / 100 MWh Sundon project in Bedfordshire, which began commercial operations in December 2024, followed by the 57 MW / 114 MWh Bramford project in Suffolk, which commenced operations in April 2025. The two additional projects—Indian Queens in Cornwall and Bredbury in Greater Manchester—are currently under construction. The Bredbury project (50 MW / 100 MWh) is expected to be completed by late 2025, while the Indian Queens project (47.5 MW / 95 MWh) is anticipated to go online in the first half of 2026.

As more facilities come online, ensuring optimal system performance becomes crucial for success. All eight projects are covered by Wärtsilä’s long-term service agreements, which enhance operational efficiency and cost predictability for EDF Renewables. These agreements for the Sundon, Bramford, Indian Queens, and Bredbury projects guarantee performance levels supported by a dedicated team.

“Together with EDF Renewables, we are boosting the reliability and flexibility of the UK’s energy system, making significant strides towards a 100% renewable energy future,” said Chris Wolf, Sales Director for Europe at Wärtsilä Energy Storage. “Our long-term service agreements further solidify this commitment by ensuring performance, minimizing operational risks, and maximizing lifecycle value.”

In addition to Wärtsilä’s battery energy storage systems, all eight sites are managed by Wärtsilä’s controls and optimization software, GEMS. This software provides EDF Renewables with data-driven insights for comprehensive asset management, performance optimization, and market trading. It enables EDF to capitalize on revenue opportunities through grid services, such as electricity market trading and frequency response, while also enhancing grid stability.

Wärtsilä’s total portfolio with EDF Renewables includes the following projects:
– Cowley & Kemsley – each 50 MW / 50 MWh
– Coventry & Bustleholme – each 50 MW / 100 MWh
– Sundon – 50 MW / 100 MWh
– Bramford – 57 MW / 114 MWh
– Indian Queens – 47.5 MW / 95 MWh
– Bredbury – 50 MW / 100 MWh

For further information about this release, please contact:
Amanda Young
Director, Marketing & Communications
Wärtsilä Energy Storage
amanda.young@wartsila.com

Image Caption: Wärtsilä and EDF Renewables UK’s Bustleholm site (50 MW / 100 MWh) contributing to grid stability in the UK. © EDF Renewables UK & Ireland

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### Wärtsilä Energy Storage in Brief
Wärtsilä Energy Storage is at the forefront of the transition to a 100% renewable energy future. We assist customers in accelerating global decarbonization efforts by merging proven technologies with extensive grid expertise. Our portfolio features high-performance hardware, intelligent controls and optimization software, and full-service lifecycle support to deliver lasting value throughout the project’s lifespan. From enhancing grid stability to unlocking flexibility and operational efficiency, our utility-scale battery energy storage solutions are designed for real-world performance. Trusted by leading utilities, developers, and system operators, Wärtsilä Energy Storage has a global presence across more than 130 sites, providing the scale, safety, and reliability essential for powering the energy transition. Visit [Wärtsilä Energy](www.wartsila.com/energy) for more information.

### About Wärtsilä
Wärtsilä is a global leader in innovative technologies and lifecycle solutions for marine and energy markets. We focus on sustainable technology and services that enable our customers to continually improve their environmental and economic performance. With a dedicated team of 18,300 professionals across over 230 locations in 77 countries, we are driving the decarbonization transformation in industries worldwide. In 2024, Wärtsilä recorded net sales of EUR 6.4 billion and is listed on Nasdaq Helsinki. For more details, visit [Wärtsilä](www.wartsila.com).