Energy storage is a largely unnecessary. You only need to store a few hours worth of electricity. Solar panels are so stupid cheap that you can solve seasonal variations in solar production by spamming solar panels. You build enough panels to meet all your needs on a cloudy winter day. Then the rest of the year you have abundant cheap power.

The energy storage problem has been solved by stupidly cheap solar panels. People will whine about the footprint required, but the actual math shows this is just FUD.