Western Area Power Administration (WAPA) and the Sacramento Municipal Utility District (SMUD) are studying the potential construction, operation and maintenance of a new 500-kilovolt transmission line. The proposed Colusa-Sutter Transmission Line (CoSu Line) would provide a new transmission path between the California-Oregon Transmission Project (COTP) located in Colusa County and WAPA's facilities in Sutter County. The proposed project would enhance the reliability of the electrical grid in Northern California and increase SMUD's ability to import and export energy, including additional renewable and low-carbon energy from the Pacific Northwest, by providing bi-directional scheduling rights between the COTP line and SMUD's transmission system.
WAPA and SMUD are currently developing the Draft Environmental Impact Statement/Environmental Impact Report, or EIS/EIR, which is anticipated for public release in mid-2019. The Draft EIS/EIR will include an analysis and disclosure of the project's potential effects on the natural and human environment in the corridor study areas. It will also include a "No Action" alternative that addresses impacts if the CoSu Line is not built. No decisions will be made about selecting a final project alternative or moving forward with construction of the CoSu Line until the Final EIS/EIR is completed, which is anticipated in 2020.
Click on the map above to view the Northern Corridor Study Area and Segment 1 Alternative currently under consideration for potential transmission line routes, and visit the Frequently Asked Questions page for further information about the proposed project.