Part of the attraction to the title pair of electric-energy assets for my home state (California) has to do with our predictable solar energy – a large majority of our days are sunny throughout the daylight hours, even in winter. The bad news is that the daily peak-power period goes into the evening, after PV has shut down. This is why I have PV+BESS for my primary residence, and my PG&E Electric bill is close to zero, year-round.
Also, our electric utilities have brought more and more BESS on-line to pair with our increasing percentage of intermittent renewable sources.