In California, you can use grid as free storage. I am with NEM2.0, so I pay $10/month grid fee, and 2-3 cents delivery fee for every kWh I send to grid and use later. And we do yearly billing.
Let's say I genated 10k kWh, I used 5000 kWh directly, and those 5000 kWh sent to grid was used later...