But I do send more power to the grid than I consume.
You send power back when nobody wants it. There is no viable solution for mass-scale storage of electricity.
So CA power company is forced by politicians to pay you for something that they cannot use.
Actually California gives away free energy to states around them at peak daytime production, and there where times that CA even paid AZ to take away their daytime surplus energy.
The state's push forward on both fossil fuel and renewable plants has led to excess power — and energy that goes to waste.
www.latimes.com
You won't see too many articles about that, because we live in a world where inconvenient fact reporting was killed.
The total solar energy installed power has to be equally supported by fast-starting natural gas turbines for back-up and night. Those turbines are expensive to build, maintain and operate, because they are usually small in size (need to be fast starting).
The bigger (and more efficient) power plants and the nuclear power plants cannot be throttled that fast.
So that inefficient night time generation (and the investments) resulted in California residents paying 50% per kWh than the average of US.
californiaglobe.com
PS: I am a firm believer that Hydrogen storage will be the future. You can make Hydrogen with all that excess power during daytime. Store it and use it later in a conventional power plant - making water vapors when is burned.
There is even research in storing hydrogen on board of vehicles.
en.wikipedia.org
Sadly a conjuncture of greedy and short-sighted politicians, coupled with huge financial interests and lobby firms lead to this insanity with battery storage on cars. China has the most to gain from this.