My off the cuff solution here is that energy providers/plants/etc. need to invest in storage capacity, or eventually the economic incentives will win out and people just won't buy energy from them in states where solar + battery works.

If you are a net producer of energy, the only calculus that makes sense (unless you want to pay for access to the grid as a form of insurance) is that you get money for providing energy back to the grid. Otherwise you just disconnect and figure it out afterward.

With renewals, decentralization of energy production, and battery proliferation we're going to see some interesting market dynamics play out here soon. We probably need a general energy market accessible to producers as small as a single person all the way up to a nuclear plant. Perhaps you should be able to log in to an energy market like you do your brokerage and buy or sell energy.