Power has been restored following a major outage in Sonoma County. A transmission line failure on Wednesday afternoon knocked out power to the entire city of Healdsburg, plus six-thousand more PG and E customers in Northern Sonoma County. The outage, which started at about noon, also affected customers in Cloverdale and Geyserville. Power was restored by 4:15 p.m. The transmission line failure was traced to damaged PG and E equipment in Cloverdale.