Mitsubishi Power Americas and Powin Energy have been appointed to retrofit 640MWh of batteries to solar PV plants in California, while a community energy group in the state has just signed a power purchase agreement for a 100MW solar plant with 150MW / 600MWh of storage.

A group of 11 community-focused energy utility groups in California have issued a Request for Information on long duration energy storage technologies that could be connected to the California Independent System Operator (CAISO) grid.