Seattle City Light is the public utility providing electrical power to Seattle, Washington, US, and parts of its metropolitan area, including all of Shoreline and Lake Forest Park and parts of unincorporated King County, Burien, Normandy Park, Seatac, Renton, and Tukwila. Seattle City Light is the 10th largest public utility in the United States and the first municipal utility in the US to own and operate a hydroelectric facility.