Fears about Britain’s ability to keep the lights on were fed new fuel this week by Engie’s announcement that it expects to close its Rugeley coal-fired power station in the summer. The week before SSE announced plans to shut down most of the units at its Fiddler’s Ferry plant in April. The week before that a report by the Institute of Mechanical Engineers (IMechE) made national headlines after it predicted a massive shortfall in Britain’s energy supply of up to 55 per cent by 2025.