California investigators have concluded that a PG&E Corp. transmission line set off a wildfire that charred Sonoma County wine country last fall, even as the utility was cutting off power to millions to reduce the risk that it would spark fires.

The California Department of Forestry and Fire Protection said Thursday it had determined that the line sparked last year’s Kincade Fire, which ignited on Oct. 23 during windy weather and spread quickly, burning about 77,800 acres and destroying 374 structures, including 174 homes….

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