The Government has said that low-carbon batteries will play a role in balancing The National Grid for the first time.

About 500MW of battery storage will come online by 2020 to 2021 and will help to assure sufficient electricity supply at times of high demand.

Britain began capacity auctions in 2014, looking to head off future power shortages as coal plants close and low power prices dissuade investors from building new ones.

Power plant owners are paid to make available back-up electricity at short notice.

Back-up electricity is tapped when supply is too low to meet demand, for instance during cold snaps, when renewable energy sources fail to produce enough power.