Times (UK): Rooftop solar panels, wind turbines and other home energy-production devices could generate almost one sixth of Britain’s electricity supplies within ten years, according to the chief executive of National Grid. Steve Holliday, who runs the UK’s largest utility company, said that 15 per cent of the country’s electricity production would come from so called "embedded generation’ in homes and offices by 2020. "That is an enormous part of the mix,’ he said ahead of a speech on the future …