China plans to more than triple solar power capacity by 2020 to as much as 143 gigawatts to help reduce carbon emissions. The country will add 15 to 20 gigawatts of photovoltaic power annually in the next five years, Nur Bekri, head of the National Energy Administration, said in a conference in Beijing on Monday. China accounted for more than a quarter of global solar additions with a record 15.1 gigawatts of installations last year,…