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Independent regulatory commissions

FERC Requests Confirmation from GreenGen on Mokelumne Pumped Storage Project

Strategic Insights

— 1 min read

GreenGenStorage, LLC's proposed Mokelumne Pumped Storage Project has raised concerns from Pacific Gas & Electric Company over potential effects on its existing Mokelumne River Hydroelectric Project. In response, FERC is requesting confirmation from GreenGen that their proposed project will not interfere with PG&E's operation. The project's draft license application was filed on August 30, 2024, and the final license application was filed on March 14, 2025. GreenGen has addressed PG&E's concerns in Attachment E-3, Table 2 of the final license application.

Key Takeaways:

  • FERC has requested confirmation from GreenGen that their proposed Mokelumne Pumped Storage Project will not interfere with Pacific Gas & Electric Company's existing Mokelumne River Hydroelectric Project No. 137.
  • The proposed project involves using the Lower Big Bear Reservoir and the Salt Spring Reservoir as upper and lower reservoirs, respectively.
  • GreenGen has addressed Pacific Gas & Electric Company's concerns in Attachment E-3, Table 2 of the final license application, filed on March 14, 2025.
  • The notice to file documentation showing PG&E's agreement was sent to GreenGen on August 25, 2025, with a deadline of September 24, 2025, at 5:00 p.m. eastern time.
  • Failure to file the requested information by the deadline may result in the dismissal of the license application.
  • The document accession number for the notice is 20250825-3015, and it was filed on August 25, 2025.

Statistics:

  • August 30, 2024: GreenGenStorage, LLC filed their draft license application for the proposed Mokelumne Pumped Storage Project No. 14796.
  • November 26, 2024: PG&E expressed concern over the proposed construction and operation of the project and requested more information from GreenGen.
  • March 14, 2025: GreenGen filed the final license application for the project, addressing PG&E's concerns in Attachment E-3, Table 2.
  • August 25, 2025: FERC sent the notice to file documentation showing PG&E's agreement, with a deadline of September 24, 2025, at 5:00 p.m. eastern time.

Sources:

  • Federal Energy Regulatory Commission (FERC) - Letter to GreenGenStorage, LLC, August 25, 2025
  • FERC Notice to GreenGenStorage, LLC, Document Accession # 20250825-3015, Filed Date: 08/25/2025

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