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Welcome to the California Public Utilities Commission (CPUC) website for the environmental review of the proposed construction of the PacifiCorp Lassen Substation Project (proposed project) located in the City of Shasta, California. PacifiCorp submitted an application for this project to the CPUC on November 2, 2015 (Application A.15-11-005) accompanied by the Proponents Environmental Assessment (PEA). The proposed project is subject to review under the California Environmental Quality Act (CEQA). This site provides access to public documents and information relevant to the CEQA review process.
PacifiCorp filed an application for a Permit to Construct the Lassen Substation Project with CPUC to construct, operate and maintain the Lassen Substation Project. PacifiCorp is proposing to replace and upgrade the existing Mount (Mt.) Shasta substation serving the City of Mt. Shasta. The applicant objectives of the proposed project are:
- To ensure the reliability of the system by replacing the existing wooden substation with a new steel pole constructed substation on a new site.
- To ensure that the system has adequate capacity to safely and reliably meet local and contractual system demand.
- To ensure that the new system is designed to accommodate operating within a115kV transmission system.
- To be operational to meet projected summer 2018 peak load demands.
The following are key components of the proposed project:
- Construction of Lassen Substation, which would be built on parcels adjacent to the existing Mt. Shasta Substation, located at 504 South Old Stage Road, Siskiyou County, California.
- Replacement of 36 transmission poles along a 1.5-mile segment of the existing 69kV power transmission system with wood-framed poles to comply with current California regulations. The 69kV system would initially operate at 69kV, but would be built to allow future operation at 115kV.
- Installation of three additional wood poles to connect existing transmission to the proposed substation and connect lines from the existing substation to the new substation.
- Connection of the new Lassen Substation to the existing distribution system by installing three 300-foot underground conduits from a cable pulling vault just outside the proposed substation.
- Reconductor two existing distribution lines, which would include the partial reconductoring of the existing 4.16kV distribution system to 12.5kV, and the undergrounding of approximately 1,200 feet of the existing overhead distribution line.
- Addition of three banks of 12.5kV to 4.16kV stepdown transformers to be added on the 12.5kV distribution feeders near the existing 4.16kV load.
- Removal and restoration of the existing Mt. Shasta Substation.
Project construction is expected to require approximately 12 months to complete.
The proposed project would be located in the City of Mt. Shasta, California, in the south central portion of unincorporated Siskiyou County (see the Regional Location Map). The existing Mt. Shasta Substation and proposed Lassen Substation sites are both located west of Interstate 5 (I-5) and the pole replacement and reconductoring activities would occur both east and west of the I-5.
Application and Proponent's Environmental Assessment (PEA)
The following documents are available for the public to view, and are available at the following links:
Application for the Lassen Substation Project - November 2015
Proponents Environmental Assessment (PEA) - October 2015
PEA Appendices
Appendix A - Visual Simulations
Appendix B - Biological Technical Report
Appendix D - Army Corp of Engineers 404 Jurisdictional Delineation
Appendix E - Geotechnical Report
Appendix F - Phase I Environmental Site Assessment Reports
Note: Appendix C is the cultural resources technical report and covers culturally sensitive resources. It is provided in confidentiality to the CPUC to protect the locations of potentially sensitive resources.
Application Review, Date Requests, and Responses
The CPUC is undertaking the completeness review of the PEA to identify additional data needs from the applicant to complete the environmental review. Updated information will be published here when information becomes available.
The CPUC, through its Environmental Review Team, is conducting an environmental review of the project. To request additional information or to be added to the mailing list, please contact us by email, fax, or phone, as follows:
Project email: LassenSubstation@dudek.com
Project voicemail: (844) 379-3477
Project fax: (844) 386-5633
The CPUC’s Project Manager is:
Michael Rosauer, CPUC Project Manager
California Public Utilities Commission
505 Van Ness Avenue
San Francisco, CA 94102
Tel.: (415) 703-2579
 Please report any problems to the Energy Division web coordinator.
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