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Sungrow has completed the grid connection and commissioning of the 1243 MWh Hams Hall battery energy storage system project.
Sungrow, a globally leading photovoltaic (PV) inverter and energy storage system provider, has completed the commissioning of what is expected to be Europe’s largest operational battery energy storage system (BESS) at Hams Hall in the West Midlands, the UK, in partnership with global energy storage owner-operator, BW ESS. The 350 MW/1243 MWh project, powered by Sungrow’s PowerTitan 2.0 technology, progressed from grid connection to commercial operation in 20 days, demonstrating exceptional speed of project delivery and commissioning.
Located adjacent to National Grid’s Hams Hall substation, this new project will play an important role in balancing electricity supply and demand, supporting the integration of renewable energy into the UK’s electricity system and strengthening grid resilience.
The delivery of the first phase of Hams Hall within 20 days was made possible through:
Direct access to technical expertise: Sungrow deployed dedicated BESS engineers directly to site, enabling technical challenges to be investigated and resolved with immediate input from the teams responsible for the technology. This reduced reliance on remote escalation and supported faster decision-making during critical commissioning activities.
Thorough preparation before hot commissioning: During the initial warm commissioning phase, the team prioritised fault identification and chiller operation, addressing potential technical issues before hot commissioning began. Dedicated operational technology engineers were also present throughout hot commissioning, providing immediate support for system integration and operational troubleshooting.
Close customer-headquarters co-ordination: Customer representatives were present on site almost daily and established escalation channels to Sungrow’s headquarters, both teams were able to address outstanding issues quickly, maintain momentum, and minimise delays between commissioning activities.
Together, these measures enabled the teams to complete hot commissioning and delivery, supporting the project’s rapid progression towards commercial operations.
James Li, Vice President, Europe at Sungrow, responded: “Delivering a battery storage project of this scale depends on the ability to bring together engineering expertise, careful preparation, and close collaboration at every stage. At Hams Hall, our teams worked directly alongside BW ESS to identify and resolve challenges quickly. This achievement demonstrates how the right technical support and strong partnerships can accelerate the delivery of critical energy infrastructure as the UK expands its renewable energy capacity.”
Nan Jia, Chief Technology Officer at BW ESS, added: “Moving a 1243 MWh system from grid connection to commercial operation in 20 days is a remarkable result, and it was only possible because BW ESS and Sungrow treated this as a shared engineering challenge. Following our work together at Bramley, Hams Hall shows what this partnership can deliver at scale. Projects like this are critical to the UK’s transition to a cleaner, more resilient energy system.”
Hams Hall represents a significant addition to the UK’s growing battery storage infrastructure. As more renewable energy comes onto the electricity grid, large scale storage projects are becoming essential to managing fluctuations in generation and demand, helping maintain a reliable and resilient electricity system.
The project is expected to expand further in its second phase, increasing total capacity to 400 MW/1424 MWh. At full capacity, BW ESS estimates it will be capable of supporting the electricity needs of approximately 1.3 million homes for up to 3.5 hours.
The project also builds on Sungrow’s ongoing collaboration with BW ESS in the UK, including the Bramley BESS project in Hampshire. The continued partnership reflects BW ESS’ confidence in Sungrow’s energy storage technology, engineering delivery capabilities, and dedicated on-site technical support. Through its PowerTitan energy storage technology and dedicated engineering support, Sungrow continues to support the deployment of utility scale storage projects that strengthen energy security and enable the UK’s transition to a cleaner energy system.
For more news and technical articles from the global renewable industry, read the latest issue of Energy Global magazine.
The Autumn issue of 2026 is available now! The new issue begins with a regional report on Asia Pacific, looking at the region’s transition from building capacity to building systems. The issue also explores topics such as offshore wind foundations, solar maintenance, training the new workforce, inspection & maintenance, and more! With insights from experts such as Everllence, BW Ideol, EM&I, Watson Farley & Williams, and many more, make sure to check out this issue now.
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