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BPA to interconnect 230-kV PacifiCorp line in Washington

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BPA to interconnect 230-kV PacifiCorp line in Washington

Bonneville Power Administration said it has decided to implement its part of a 230-kV transmission project planned by a PacifiCorp unit to shore up reliability in the Yakima, Wash., area.

PacifiCorp, which does business as Pacific Power in the Pacific Northwest, will construct, operate and maintain the Vantage to Pamona Heights project. The line will run about 40.5 miles and connect PacifiCorp's existing Pomona Heights substation in Yakima County, Wash., to the administration's, or BPA's, existing Vantage substation in Grant County, Wash.

BPA recently issued a record of decision outlining its intention to allow the interconnection of the transmission line to its Vantage substation. The document notes that Pacific Power proposed to build the project and PacifiCorp asked for the interconnection to the BPA substation.

To allow this interconnection, BPA said it will execute a line and load interconnection agreement with PacifiCorp to provide interconnection facilities and services for the transmission line. Interconnection will involve connecting Pacific Power's transmission line to an existing substation bay the Vantage substation; connecting the transmission line's fiber to the Vantage substation control house; and installing and operating related electrical, metering and relay equipment. The interconnection facilities will be located mostly on BPA-owned property within the Vantage substation fence line, the record of decision said.

The project has been planned for several years. The U.S. Bureau of Land Management, released a draft environmental impact statement in 2013. A supplemental draft EIS was issued in 2015 and the final EIS was issued about a year ago, in October 2016.

The BLM in January granted a right-of-way Pacific Power to construct, operate and maintain the project on roughly four miles of bureau-administered land in Yakima and Kittitas counties in Washington.

Construction of the interconnection facilities is expected to begin in fall and winter of 2018 and 2019 and extend through 2020, according to the record of decision.