• The shift towards a grid powered by wind and solar necessitates extensive long-duration energy storage for periods of low renewable generation.
• We have proposed building two compressed air energy storage (CAES) plants in California, using underground caverns to store compressed air for electricity production.  
• Each plant could generate hundreds of megawatts for up to eight hours, without greenhouse gas emissions.
• While CAES isn’t new, our approach is more efficient, utilizing heat storage for reuse. With California’s demand for long-duration storage growing, projects like what have are crucial.
• Despite past disappointments, advances in storage technology and increasing demand signal a promising future for CAES and other long-duration storage solutions. 

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