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BW ESS announced commercial operation on November 2, 2026, at Hams Hall, a 350MW/1,240MWh battery energy storage system in England. The company and Energy-Storage.News describe it as Europe’s largest BESS to reach commercial operation; a planned second phase would increase the site to 400MW/1,424MWh.
BW ESS has put the 350MW/1,240MWh Hams Hall battery in England into commercial operation, the company announced November 2, making it, according to the report, the largest battery energy storage system in Europe to reach that stage. The project sits beside National Grid’s Hams Hall substation in the West Midlands and is expected to expand in a second phase.
Hams Hall is a battery energy storage system, or BESS, with a reported duration of about 3.5 hours at its current 350MW power rating and 1,240MWh of storage. The figures describe different capabilities: megawatts measure how quickly the system can deliver power, while megawatt-hours indicate the amount of energy it can store.
BW ESS said the project reached commercial operation 20 days after energisation. Sungrow supplied the project’s battery and inverter technology, while power group EDF is responsible for optimising the project, according to Energy-Storage.News. The report does not provide details of the commercial arrangements or the services EDF will provide.
The current installation is the project’s first phase. BW ESS says Hams Hall’s capacity is planned to rise to 400MW/1,424MWh when a second phase is complete. The report does not give a construction schedule or expected date for that expansion.
A Large Battery Joins the UK Grid
Hams Hall adds a large-scale storage asset beside a National Grid substation, linking its location directly to the electricity network. Batteries can absorb electricity and later return it to the grid, but the announcement does not specify how Hams Hall will be dispatched or which grid services it will provide.
The project’s scale also gives a concrete marker of battery deployment in Europe: at 350MW and 1,240MWh, it is described by BW ESS and the report as the largest European BESS to enter commercial operation. That is a claim about operational projects, not a ranking of every project under construction or in development. The planned expansion would add both power capacity and stored energy, though its timing and delivery remain unconfirmed.
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Hams Hall’s First Operational Phase
The facility is in the West Midlands, England, adjacent to National Grid’s Hams Hall substation. Its proximity to the substation is part of the project description; the source does not detail its grid connection capacity, planning conditions or the arrangements for trading electricity.
The reported 20-day period between energisation and commercial operation gives a short commissioning timeline for this project. It does not, by itself, establish a typical timeline for other battery projects. The available report identifies BW ESS as owner-operator, Sungrow as technology supplier and EDF as optimiser, but supplies no further operational performance data.
“The company said Hams Hall reached commercial operation 20 days after energisation.”
— BW ESS, as reported by Energy-Storage.News
Expansion Timing and Operating Details
The source does not state when the second phase will be completed, what construction work remains, or whether the 400MW/1,424MWh target is subject to further approvals or changes. It also provides no breakdown of the project’s revenues, operating contracts, availability or performance since commercial operation began.
The claim that Hams Hall is Europe’s largest operational BESS is reported as a current comparison, but the article does not list other projects or explain the criteria used to rank them. No information is provided about how often the battery will charge or discharge, the markets in which it will operate, or the specific grid services EDF will optimise.
Second Phase Is the Next Milestone
The next stated milestone is completion of the second phase, which would bring the project to 400MW/1,424MWh. BW ESS has not provided a timetable in the available report, so the timing of that increase remains unknown.
Further updates would be needed to confirm the expansion schedule and provide operational information, including how the asset is being used and its performance in electricity markets. For now, the confirmed development is the start of commercial operation for the 350MW/1,240MWh first phase.
Key Questions
Where is the Hams Hall battery project?
It is in the West Midlands, England, beside National Grid’s Hams Hall substation.
How large is Hams Hall’s operational first phase?
The first phase is rated at 350MW/1,240MWh, with a reported duration of about 3.5 hours.
Who supplied and optimises the project?
Sungrow supplied the battery and inverter technology. EDF is optimising the project, according to Energy-Storage.News.
Will Hams Hall expand?
A second phase is planned to increase the site’s capacity to 400MW/1,424MWh. The report gives no completion date.
Source: energy-storage.news
