It sounds like you are alluding to NEM3 here. If so, I'm not sure that was meant to incentivize small scale energy storage. They recently tried to implement a flat fee that would have killed residential solar entirely, even with batteries. That did not happen, but I think it shows the motivations. I'm also not sure batteries even change that much for the grid. You still need to have the capacity for lulls when all the batteries are empty.