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United States. Federal Energy Regulatory Commission

Pacific Gas and Electric Company Addresses Recommendations for Lake Almanor Dam

Strategic Insights

— 2 min read

Pacific Gas and Electric Company has submitted a document to the Federal Energy Regulatory Commission (FERC) addressing Recommendation 52 (R-52) from the 11th 5-year Part 12D safety inspection report and Recommendation 3 (R-3) from the Causal Analysis Report for 2022 Low-Level Outlet Repairs for Lake Almanor Dam, part of the Upper North Fork Feather River Hydroelectric Project, FERC No. 2105. The document presents summaries and conclusions of PG&E's efforts to address R-52 and R-3, including seismic analysis, structural evaluation, and hydraulic assessment of the low-level outlet system. PG&E believes that R-52 and R-3 have been satisfactorily addressed, and no further action is necessary.

Key Takeaways:

  • Pacific Gas and Electric Company has submitted a document to the Federal Energy Regulatory Commission addressing Recommendation 52 and Recommendation 3 for Lake Almanor Dam.
  • The document presents summaries and conclusions of PG&E's efforts to address R-52 and R-3, including seismic analysis, structural evaluation, and hydraulic assessment of the low-level outlet system.
  • The seismic stability and structural evaluation of the outlet tower were prepared by PG&E's consultant, Quest Structures, and dated October 31, 2024.
  • The hydraulic assessment of the low-level outlet system was prepared by PG&E's consultant, Northwest Hydraulic Consultants Ltd, and dated June 26, 2025.
  • PG&E has reviewed the consultant's reports and concurs with the information presented therein.
  • PG&E believes that R-52 and R-3 have been satisfactorily addressed, and no further action is necessary.
  • The document includes summaries and conclusions for Recommendation 52 and Recommendation 3, as well as supporting documentation from PG&E's consultants.
  • Chris Duffey, dam safety engineer, and Andrew Garcia, license coordinator, are available to answer technical and general questions, respectively.

Statistics:

  • The document was submitted to the Federal Energy Regulatory Commission on July 3, 2025.
  • The seismic analysis for the outlet tower was prepared by PG&E and dated June 16, 2025.
  • The hydraulic assessment of the low-level outlet system was prepared by PG&E's consultant, Northwest Hydraulic Consultants Ltd, and dated June 26, 2025.
  • The structural assessment of LLO conduit and discharge structure was prepared by PG&E's consultant, Gannett Fleming, and dated June 4, 2025.
  • The document includes 7 enclosures, including summaries and conclusions for Recommendation 52 and Recommendation 3, as well as supporting documentation from PG&E's consultants.

Sources:

  • Pacific Gas and Electric Company, "Upper North Fork Feather River Hydroelectric Project, FERC No. 2105-CA Lake Almanor Dam, NATDAM No. CA00327 11th Part 12D Inspection - Recommendation 52 Causal Analysis for LLO Tunnel Repairs - Recommendation 3 Summaries and Conclusions ENCLOSURES CONTAINS CUI//CEII - DO NOT RELEASE"
  • Federal Energy Regulatory Commission, "FERC No. 2105"
  • Quest Structures, "Seismic Stability and Structural Evaluation, Lake Almanor Outlet Tower", dated October 31, 2024
  • Northwest Hydraulic Consultants Ltd, "Lake Almanor Dam Low Level Outlet System, Hydraulic Assessment", dated June 26, 2025
  • Gannett Fleming, "Lake Almanor Dam - Structural Assessment of LLO Conduit and Discharge Structure", dated June 4, 2025

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