PTC India Ltd, India’s largest electricity trader, will buy surplus power from Bhutan government-run Druk Green Power Corp. Ltd, which runs the 720 megawatts Mangdechhu hydropower project. “PTC India Ltd signed power purchase agreement with Druk Green Power Corp. Ltd for purchase of surplus power from 720MW Mangdechhu hydro electric project in Bhutan for 35 years. Government of India has …