The cause of the fire has not been determined. But according to PG&E, a jumper on a tower, a metal connector between an incoming and outgoing electrical line, broke seven minutes before the fire was reported. The 230,000-volt power line that runs through the 40-year-old tower, critical to electrical operations, had not been included in the outages. PG&E has not provided the exact location, but investigators were seen under this tower off Kincade Road in subsequent days, with the area cordoned off. The building behind the tower is a decommissioned Calpine plant. The company is the nation’s largest geothermal power producer, operating 13 plants in The Geysers region capable of generating up to 725 megawatts of energy.