It isn't mandatory, it is necessary. Most homes can't put enough solar panels on the roof the power the home 24/7, and for those times when the sun isn't shining (night, lousy weather, etc.) you'd need a battery array to time-shift the energy generated by the solar panels. Interesting tidbit: even some hydropower facilities use methods to time-shift electrical generation. Like the Grand Coulee dam.
Grand Coulee Dam, John Keys Pump Plant, John W. Keys III Pump-Generating Plant, Columbia Basin Project, Bureau of Reclamation - Managing water and power in the West
www.usbr.gov
That's not the point I was trying to make. If you really are off-grid you don't pay anything. Many states or power utilities are subject to statutes that force them to buy back surplus residential solar power, assuming the residential installations have the appropriate technology:
And as I just mentioned, most homes can't accommodate enough solar panels to fully power the home anyway.
Just using the example of San Diego Gas and Electric:
www.sdge.com
These statues are usually unfunded mandates, and all ratepayers end up paying the cost, but ratepayers who don't or can't install solar subsidize those who do.
I'm sorry you have to live with a utility dumb enough to build a coal plant, but what does this have to so with solar?
BTW, for you and Ponzio, I'm not necessarily defending power companies. I am, however, against dumb unfunded government mandates like mandatory solar power (
https://www.bloomberg.com/news/articles/2019-10-22/california-prepares-for-a-huge-solar-boom), and mandatory power buybacks at a certain rate, and then public commission regulated rate increases that never cover the mandates. The end result is usually less reliable power. A lot of California's power problems are from long-standing unfunded mandates regarding renewable power sources, buybacks, and decommissioning existing power plants, which caused a diversion of resources from grid maintenance and upgrades. The result is very high rates and rolling blackouts during high demand. I always considered myself somewhat left of center when it came to environment issues, but the recent rise of the New Green Deal idiocy has made my views, which haven't changed, seem pretty right wing. I find that the only entities greedier and dumber than private corporations are governments.