72-07: Estimating Cooling Tower Costs Performance - A Tool for DeterminingBonneville Power Administration is a bureau of the Department of the Interior. It has been designated as the marketing agent for power from 33 multipurpose Federal dams in the region, of which 26 are existing and five are under construction. Two dams are authorized, but not yet started. In accomplishing its mission, BPA has designed and built the nation's largest network of long distance transmission lines. BPA does not build dams or powerplants.