But only if the current design of utility rates remains the same. But it won't, because utilities are regulated monopolies which are permitted to recoup the costs of their investments. So, they will lower the price of power during the day, and raise it during the night.
Residential electricity is less than half of the electricity used in California. Solar may slow down the electrical generation growth needs, but I doubt it will shut down any generators. (Except for some peak usage gas generators).
