Climate-friendly energy sources such as wind and solar rely on the weather playing ball, and when it doesn’t, the UK is forced to fire up costly and polluting gas to prevent blackouts. But in Merseyside, a facility of massive batteries are on a mission to solve that problem.On this week's episode Tom Heap checks out nightlife in Liverpool - not to let loose, but to learn why massive batteries could keep the lights on when demand is high and renewable power generation is low.Producer: Emma Rae WoodhouseEditors: Paul Stanwoth and Philly Beaumont