EXECUTIVE SUMMARY
Two 50 MW/100 MWh BESS facilities at Cathkin and Broxburn have entered full commercial operation, adding 100 MW/200 MWh of storage in Scotland. The two-hour systems participate in UK electricity and balancing markets, using ENGIE’s ORUS optimisation platform to manage grid response and market participation.
Company: ENGIE
Projects: Cathkin and Broxburn BESS
Location: Scotland, UK
Power Capacity: 100 MW combined
Storage Capacity: 200 MWh combined
Individual Capacity: 50 MW/100 MWh each
Duration: 2 hours
ENGIE, a global energy company active in renewable power, battery storage and energy management, has reached full commercial operation at its Cathkin and Broxburn Battery Energy Storage System (BESS) facilities in Scotland. The two sites add a combined 100 MW/200 MWh of storage capacity to the company’s UK portfolio.
The Cathkin facility, located near East Kilbride, and the Broxburn facility, west of Edinburgh, each have a capacity of 50 MW/100 MWh. Both systems provide two hours of storage and are designed to store surplus electricity before discharging it to the grid when required.
The facilities participate in UK electricity and balancing markets, responding to changes in electricity supply and demand. Their operation is supported by ORUS, ENGIE’s AI-driven optimisation platform, which uses real-time data, analytics and automated market participation to manage the batteries across multiple revenue streams.
The projects provide rapid-response grid services and support the integration of renewable generation into the electricity system. Battery storage can absorb electricity during periods of surplus generation and discharge it during periods of higher demand or when required by the grid.
“The commercial operation of Cathkin and Broxburn represents a major milestone for ENGIE’s battery storage ambitions in the UK. As renewable energy becomes an increasingly important part of the electricity mix, flexible storage infrastructure is essential to ensuring the grid remains stable and resilient.”Suresh Bhaskar, Managing Director for Renewables and Batteries UK and Ireland at ENGIE
The projects involved ENGIE teams working across development, construction, operations, energy management, trading and digital systems. The two facilities also contribute to ENGIE’s target of reaching 95 GW of installed renewable and storage capacity globally by 2030.