United States and China help boost worldwide solar production by 50% over last year
There are 305 gigawatts of solar generation capacity in the world, up from 50 gigawatts in 2010
Amazon is going green, installing rooftop solar on distribution warehouses
Amazon plans 41MW of solar installations by the end of 2017
Tesla's grid-connected Powerpack station comes online in California
System can power 2,500 homes for a full day
