Mokelumne Pumped Storage Project – GreenGen LLC

Mokelumne Pumped Storage Project - P-14796

GreenGen LLC, owners of the proposed Mokelumne Pumped Storage Project, will be filing its Pre-Application Document (PAD) and Notice of Intent (NOI)  with the Federal Energy Regulatory Commission (FERC) in early April as part of the FERC official licensing process. GreenGen will also be holding a virtual public open house from 2 to 5 p.m., Thursday, March 31, 2022.

The Foothill Conservancy will fully participate in the FERC process and will be doing outreach to interested parties, keeping the public informed, and preparing comments where appropriate in the process. Stay tuned for updates.

What is the GreenGen Project?

The Mokelumne Pumped Storage Project would be located on the Upper Mokelumne River.

The project will pump water from Salt Springs Reservoir up to Lower Bear River Reservoir when renewable electric generation exceeds customer load on the grid and electricity prices are low. Then it will deliver water from Lower Bear River Reservoir down to Salt Springs Reservoir and generate electricity when customer load exceeds renewable generation and prices are high, typically between about 4 and 9 p.m. Pumped storage projects typically consume more electricity than they generate. Construction elements would include a water conveyance tunnel, a powerhouse, transmission line, and other infrastructure needed to connect the two reservoirs. 

Image Credit GreenGenLLC

What are our main concerns with project?:

  • Recreational impacts.
  • Potential impacts to PG&E’s Mokelumne River Project 137.
  • Water quality impacts such as temperature, turbidity.
  • Project feasibility (i.e. power transmission and water rights).
  • Impact of climate change on project operations.
  • Project alternatives.
  • Wildfire risk.
  • Biological impacts to native habitat and sensitive wildlife species

How you can help:

  • Contact to be added to the Mokelumne Pumped Storage Project contact list. Please feel free to let us know your main concerns.
  • Attend the March 31 Virtual Open House at 2-5 p.m. to learn more about the project, and share any concerns and questions you may have.
  • Tell people you know about this project and make them aware of the potential issues.
  • Follow us on social media and share our outreach materials. 
  • Keep an eye out for the filing of the NOI and PAD and provide feedback during the subsequent 60-day comment period.

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Larry Patterson, Director, Camanche Village, CA:  MS Civil/Transportation Engineering UC Berkeley, BS Civil Engineering University of Texas, private consultant, former Public Works Director and City Manager of San Mateo, recipient of the League’s James L. Martin Award in 2012