Root-Power Submits Plans for 300MW of Long-Duration Energy Storage
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Battery energy storage system (BESS) developer Root-Power has announced today (June 10, 2025) that it has submitted plans for four energy storage projects as part of Ofgem’s long-duration energy storage (LDES) tender. These projects, if approved, will collectively provide a remarkable 2.4GWh of storage capacity and will be located in West Yorkshire, North Yorkshire, Buckinghamshire, and Lincolnshire.
The proposed projects will utilize vanadium flow battery systems, a technology that is currently not widely adopted in the UK’s BESS sector. Historically, Root-Power has focused primarily on delivering 2-hour and 4-hour lithium-ion battery projects, contrasting with the 8-hour duration capabilities of the vanadium flow batteries planned for these new initiatives.
Ofgem’s cap and floor investment support scheme for LDES projects, which launched in April 2025, aims to stimulate the development of such projects. This scheme was established following extensive collaboration between the Department for Energy Security and Net Zero (DESNZ), the National Energy System Operator (NESO), and Ofgem. The initiative is designed to bolster investor confidence and ensure public value for money by setting minimum and maximum revenue thresholds for LDES projects. The first application window for this scheme closed on June 9, 2025.
To date, the majority of projects showing interest in the scheme have been focused on pumped hydro energy storage (PHES) rather than battery energy storage solutions.
Founded in July of the previous year as a specialized BESS division of the YLEM Group, Root-Power has advanced over 40 projects through various stages of development. Recently, the company announced the commencement of construction on the Dounreay BESS, a 34MW/68MWh BESS facility situated in a remote coastal area of the Scottish Highlands. This site was specifically selected to accommodate the expected significant expansion of wind power in the coming years.
Neil Brooks, managing director at Root-Power, expressed the company’s dedication to spearheading the future of energy storage in the UK. He stated, “Our team has been carefully developing these projects for some time, and it is fantastic to see the culmination of that work as these projects join our wider portfolio of battery energy storage systems.”
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