Renewables are intermittent and therefore unreliable. Also unless california has gone for lots of redundancy the would also be displacing fossil fuel power plants. Again i'm not trashing renewables, because what's wrong with free energy. What i am doing automatically is wondering why batteries are a better option then traditional power stations.
California does have much more expensive electricity then anywhere else, so it is reasonable for me to scrutinise their energy plans more closely and question whether their current strategy is really the best one.
The sun does not shine 24 hours a day. Therefore, if you want to run a power grid 24 hours a day, you need expensive batteries to hold energy collected during peak production. Fossil fuels can be burned continuously, lessening the need for energy storage
