By Marc Campopiano, Neeraj Arora, Jared Johnson and Benjamin Gibson

The California Public Utilities Commission (CPUC) will require the state’s three large investor-owned utilities (IOUs) to invest in a combined 1,325 MW of energy storage by the end of 2020, the first-such mandate in the United States.  The CPUC views increased deployment of energy storage as an important step towards a greater reliance on renewable energy to meet California’s electricity needs.  Energy storage allows electricity generated during off peak periods to be used during peak periods.  This is particularly useful in the context of intermittent renewables that may not be available during peak demand periods.