HYDERABAD: It may take several months for restoration of four of the six units of the hydro electric power station on Krishna river bank at Srisailam, which were damaged in the ravaging fire that broke out on the night of August 20, killing nine employees. “If the turbines and generators are damaged, it will take time as they have to be imported from Japan,” TS Transco and Genco Managing Director Devulapalli Prabhakar Rao told Express. Two units are in good condition as they have not suffered any damage and power generation could be resumed in the next 15 days.