BPA 1100 kV Transmission System Development-Planning, Program, and Objectives

This paper summarizes current system planning studies for application of 1100 kV to the Pacific Northwest transmission system, the associated test and development program, and construction of two test lines. It compares 500 and 1100 kV costs and shows 1100 kV to be economical at loadings above 4,000-5,000 MW. The two test lines consist of 1200 kV Lyons Electrical Prototype Line at Lyons, Oregon, and the 1200 kV Moro Mechanical Test Line at Moro, Oregon.