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EA-1366: Preliminary Environmental Assessment

Santiam-Bethel Transmission Line Project

Bonneville Power Administration proposes to rebuild the first 17 miles of the Santiam-Chemawa transmission line from Santiam Substation to the line’s connection to Portland General Electric’s Bethel Substation. BPA would replace the existing single-circuit 230-kilovolt (kV) line with towers that could support two circuits. The existing line supplies both Bethel Substation and BPA’s Chemawa Substation. The new lines would eliminate overloading of the existing line from Santiam Substation to the line’s connection to Bethel Substation by having one new line supply Bethel Substation and the other new line supply Chemawa Substation.