Resolution approving and authorizing the General Manager of the San Francisco Public Utilities Commission, on behalf of CleanPowerSF, to participate in California Community Power’s procurement of the Willow Rock Long Duration Storage Project by 1) entering into the Buyer Liability Pass Through Agreement and 2) entering into the Willow Rock Long Duration Storage Project Participation Share Agreement, for a total not to exceed amount of $75,900,000 with a contract duration of 20 years, estimated to begin July 1, 2030, through June 30, 2050, pursuant to Charter, Section 9.118.

This resolution authorizes the San Francisco Public Utilities Commission (SFPUC), on behalf of CleanPowerSF, to enter into two key agreements for the Willow Rock Long Duration Storage Project. This project, a 500 MW compressed air energy storage battery located in Rosamond, California, is crucial for meeting state-mandated grid reliability and clean energy goals.

Project Details:
CleanPowerSF will secure 11.5 MW of the project's capacity, contributing to its 15.5 MW Long-Duration Storage (LDS) procurement obligation set by the California Public Utilities Commission (CPUC) in Decision D.21-06-035. The project is expected to begin commercial operations on July 1, 2030, with the contract running for 20 years until June 30, 2050.

Financial Commitment:
CleanPowerSF's total financial commitment for this project will not exceed $75,900,000, funded entirely by CleanPowerSF customer revenues. This participation is facilitated through California Community Power (CC Power), a joint powers agency, and involves a Buyer Liability Pass Through Agreement and a Project Participation Share Agreement.

Environmental Review:
The California Energy Commission (CEC) completed the environmental review under CEQA, adopting a Final Decision on December 19, 2025, which the SFPUC has reviewed and found adequate.