WALLULA SUBSTATION
Wallula, Washington

OWNER—PACIFICORP
Wallula, Washington

The Stateline Wind Energy Project is currently the largest single-owner wind energy project in the world, designed for the ultimate construction of 454 wind turbine generators and 300 MW. The project is designed to deliver 200 MW at 230 kV to the PacifiCorp Wallula Substation, and 100 MW to BPA’s 115-kV Franklin–Wallula transmission line.

The PacifiCorp Wallula Substation was modified from a 3-position to a 4 position ring bus to accept the Nine Mile 230-kV transmission line termination. A new circuit breaker was added, as well as foundations, conduit, cabling, buswork, and relay/metering panels necessary to make a complete system.

This was a fast-track design project requiring staged design submittals to accommodate the contractor’s schedule, and continuous design modification to accommodate refinements to the turbine string locations. Project construction began in February 2001; wind-generated power began flowing into the northwest power grid on July 16, 2001.