National Grid, sole operator of Britain’s electricity transmission system, has contracted RES Renewable Energy Systems to install 20 MW of energy storage for dynamic frequency response on its networks. RES is one of the suppliers to have pre-qualified for the tender following a request last September that drew responses from more than 70 suppliers offering a combined capacity of more than 7 gigawatts.

National Grid’s enhanced frequency response tender is in response to a loss of inertia across the U.K. grid as coal-fired plants are retired. The grid operator is looking to buy fast-reaction capacity in blocks of between 1 megawatt and 50 megawatts per vendor, for an initial contract period of four years starting between fall 2017 and spring 2018.

Lithium-ion Battery