Bonneville power administration´s prototype 1100/1200 kV transmission line project

Studies indicate that power transmission lines with capacities of 8,000 to 10,000 MW will be needed in the 1980´s to meet anticipated Trans-Cascade Mountain transmission requirements in the Pacific Northwest. One attractive alternative to meeting these needs is to overlay BPA´s 500 kV grid with an 1100 kV transmission system. In order to verify the adequacy of the 1100 kV line design before a commitment for an 1100 kV system is made, it has been decided to build and operate a short prototype three-phase electrical line and a short mechanical test line. The two lines will be completed by the end of 1976 at which time an extensive test program including mechanical, electrical; and biological tests will commence.