frankie macritchie died from multiple dog bites in april last year at a holiday park in cornwall.but tonight the switch to greener energy sources will reach a significant milestone. it will be two months since any of britain's electricity was generated from burning coal. the change has been rapid. just a decade ago, more than a0% of the country's electricity came from coal. 0ur chief environment correspondent, justin rowlatt, reports. it's these guys' jobs to make sure your lights stay on. this is the control room at the heart of the national grid. the screen behind me shows where britain is getting its energy from right now. it's a mixture of gas, nuclear, biomass, hydro, wind and solar. but no coal. and as of midnight tonight, britain won't have burnt any of the black stuff for two months, smashing the previous record. there are nowjust four coal—fired power stations left in the country. why burn coal when you can get power from these? just one rotation of this giant turbine can power the average home for a day, and these days building new renewables isn't just about the environ