A trial to use household batteries to help support the electricity grid in London is being rolled out further to help deal with peaks in winter demand and reduce carbon emissions. Published on Friday 6 March, the initial trial by UK Power Networks (UKPN) paid 45 households to store energy in batteries in their homes, which the network operator drew on in times of need. BEIS said it successfully reduced household evening peak electricity demand by 60% and helped cut carbon emissions from electricity by 20% for average households. The government-backed company behind the battery system, Powervault, is now rolling the scheme out as part of a second commercial contract in St Helier, South London, which will help further improve flexibility in the electricity network.