Sources like wind and solar are also significantly cheaper and should lead to cheaper bills in the long-run.Scientists, governments and the UN say switching to renewable power is crucial as the effects of global warming are already being felt, including in the UK, which last year recorded its hottest year since records began.On a single day in November, more than 70% of electricity was produced by wind, or around 20GW."Our old-fashioned energy grid urgently needs investment to maximise the opportunity that wind and solar offer to continue to reduce bills," she said.Prime Minister Rishi Sunak agreed in December to relax restrictions that effectively prevented onshore wind turbines."