The Somerset-Fideoak Mill Battery Energy Storage System is a 30,000kW energy storage project located in Somerset, England, UK.

The electro-chemical battery energy storage project uses lithium-ion as its storage technology. The project was announced in 2018 and was commissioned in 2019.


The Somerset-Fideoak Mill Battery Energy Storage System was developed by South Somerset District Council. The project is owned by South Somerset District Council (100%).

The key application of the project is frequency control ancillary services.

Contractors involved

BYD and South Somerset District Council have delivered the battery energy storage project.

Additional information

South Somerset District Council (SSDC) and Opium Power are the owner and developer of the project. BSR Connect and KiWi Power providing additional services. South Somerset District Council working with Opium Power and KiWi Power to expand the capacity of the 25 MW unit with an additional 5 MW development at the site near Taunton. The 25 MW storage system, which has a one hour duration, is already providing flexibility services to the grid.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.