BENTON COUNTY, Wash. — Thousands of people in Benton City and Prosser are without power after a major outage Sunday morning. An estimated 5,500 customers are without power. A spokesperson for Benton PUD tells Action News that a Bonneville Power transmission line feeding the area of west Benton County is down. Crews with Benton PUD are working with Bonneville Power to find out the cause of the outage. A spokesperson for Benton PUD did not have more details to offer.