How renewable energy makes power cuts more likely

At 16 minutes past four on Friday a press officer at National Grid put out a tweet which seemed to signal Britain’s progress towards its much-vaunted zero-carbon economy. The proportion of UK electricity generated by wind power, it boasted, had just reached a record high of 47.6 per cent. What, with the weather sunny as well as windy, the total coming from renewable energy was nearly two-thirds.