TL;DR
Get backup power and energy gear delivered free with Prime
- Fast, free delivery on millions of items
- Prime Video, Amazon Music and more included
- Member-only deals all year
BW ESS announced commercial operation on November 2, 2026, for its 350MW/1,240MWh Hams Hall battery energy storage system in the West Midlands. The company describes it as Europe’s largest operating battery storage project; capacity is planned to rise to 400MW/1,424MWh after a second phase is completed.
BW ESS has started commercial operation at its 350MW/1,240MWh Hams Hall battery energy storage system in England, a project the company identifies as Europe’s largest battery storage system now in operation. The site is beside National Grid’s Hams Hall substation in the West Midlands, and the development is planned to expand in a second phase.
The owner-operator announced the start of commercial operations on November 2. The first phase has a power capacity of 350MW and energy capacity of 1,240MWh. Based on those figures, it can discharge at full rated power for roughly 3.5 hours, although actual operation will depend on dispatch and operating conditions.
BW ESS said the project reached commercial operation 20 days after energisation. Sungrow supplied technology for the project, while power company EDF is responsible for optimising it. The source report does not specify the terms of EDF’s role or identify which market services the battery will provide.
A second phase is expected to bring Hams Hall’s total capacity to 400MW/1,424MWh. The report does not give a completion date for that expansion. The operating capacity reported on November 2 therefore refers to the first phase, not the planned full-site capacity.
A Major Addition to UK Storage
Hams Hall adds a large-scale battery resource to the UK electricity system. Batteries can absorb electricity when supply is available and discharge it later, helping balance changes in generation and demand. The project’s 1,240MWh of energy capacity gives it the ability to shift substantial amounts of electricity, while its 350MW power rating indicates how quickly it can deliver or absorb power at its rated level.
The project’s scale is also relevant to Europe’s developing battery-storage market. Large systems can offer grid flexibility, but their real contribution depends on how they are operated, connected and remunerated. BW ESS’s announcement confirms that Hams Hall has entered commercial operation; it does not, on its own, establish the project’s revenue, utilisation, or effect on electricity prices or reliability.
Products Worth Considering
Samsung 34-Inch Odyssey G5 Ultra-Wide Curved Gaming Monitor
Samsung 27-inch Odyssey G5 QHD Gaming Monitor (G51F)
LG UltraGear 32GX850A-B 32-inch 4K UHD Glossy OLED Gaming Monitor
As an affiliate, we earn on qualifying purchases.
Hams Hall’s First Operating Phase
The Hams Hall battery is located adjacent to National Grid’s Hams Hall substation in England’s West Midlands. Its grid location is part of the project’s physical setup, but the source report does not provide further details about its connection arrangements or operational limits.
BW ESS is the project’s owner-operator, Sungrow supplied technology, and EDF is optimising the asset. The first phase is rated at 350MW/1,240MWh; the planned second phase would raise the site total to 400MW/1,424MWh. The report calls the operating project the largest in Europe, while also qualifying that description as the largest the publication is aware of. The claim is therefore best understood as a reported comparison, not an independently documented ranking in the source material.
“The company announced that Hams Hall had reached commercial operation.”
— BW ESS
Expansion Timing and Operating Details
The announcement does not state when the second phase will be completed, what construction or commissioning milestones remain, or whether the proposed expansion has a firm schedule. It also does not provide details on the battery’s expected utilisation, contracted revenues, degradation assumptions, or the specific services EDF will optimise.
The project’s status as Europe’s largest is reported by the source, which says it is the largest system it is aware of to reach commercial operation. The article does not set out a full comparison of operating European projects. Actual output and discharge duration may also vary with operating conditions, so the rated capacity figures should not be read as a guarantee of continuous performance.
Second Phase Will Raise Capacity
The next stated development is completion of the planned second phase, which would increase Hams Hall to 400MW/1,424MWh. BW ESS has not provided a date for that work in the source report. Until further details are announced, the confirmed operating status applies to the first-phase 350MW/1,240MWh installation.
Further information from BW ESS, EDF or the project’s suppliers may clarify the expansion schedule and how the system is being used commercially. For now, the immediate milestone is that the first phase has entered commercial operation after energisation, with the larger site capacity remaining a future project target.
Key Questions
Where is the Hams Hall battery project?
It is in the West Midlands, England, adjacent to National Grid’s Hams Hall substation.
What is the project’s operating capacity?
The first operating phase is rated at 350MW/1,240MWh. BW ESS says the project reached commercial operation 20 days after energisation.
How large will Hams Hall be after the second phase?
The planned second phase would raise total capacity to 400MW/1,424MWh. No completion date was provided in the source report.
Which companies are involved?
BW ESS owns and operates the project, Sungrow supplied technology, and EDF is optimising the asset.
Is Hams Hall confirmed as Europe’s largest battery?
The source report describes it as the largest BESS in Europe to reach commercial operation that it is aware of. It does not provide a comprehensive comparison of all European projects.
Source: energy-storage.news
