[jeffbee]

We already have a considerable seasonal surplus of photovoltaic power. We actually disconnect California PV plants in the spring because we can't use the energy they would produce, and we have to pay the operators of those plants for the curtailment. This represents essentially cost-free energy that we can redirect to desalination. As we deploy more and more PV to cover our late-summer peak demands, the spring curtailment will also grow.