The four-year contract will see RES provide 20MW to the grid in less than a second of the detection of frequency deviation.

The battery storage system is anticipated to start operations in 18 months.

RES has already commissioned six similar projects in North America.

RES and National Grid have been working on the new service since 2014 and their collaboration has been a forerunner to National Grid’s upcoming tender for 200MW of enhanced frequency response.

National Grid senior account manager Adam Sims said: "This is the first time that battery storage will be used to provide such fast-acting frequency response service to the National Transmission Network in Great Britain.

"This innovative technology will enable us to respond to frequency issues in under a second, helping to maintain the integrity of the grid.

"This service and the forthcoming Enhanced Frequency Response service will support the network as we transition to a generation mix with greater levels of low cost renewable energy."

RES energy storage manager John Prendergast said: "Energy storage can play a large role in supporting the UK’s transition to a secure, low carbon, low cost energy system.

"We believe that this contract will play an important role in demonstrating this and will encourage policy makers and regulators to accelerate the removal of barriers to wider deployment of energy storage in the UK."

RES has been active in energy storage for more than six years. The company currently has 13 different energy storage projects either complete, or under construction, in seven different markets.

Image: National Grid and RES launch the UK’s first sub-second frequency response service using battery storage. Photo: Courtesy of Renewable Energy Systems Ltd.