In plenty of places, the wet bulb temperature is high 24 hours a day. At night, the temperature goes down, but relative humidity goes up, so you feel cooler, but also worse. You still need AC during that time, but mainly to dehumidify.

Also, in many places, peak demand is actually in the early evenings because people let their houses get hot while they are at work, but turn the AC on when they get home.

Any way you can store energy for even a few hours is really nice, and these kind of solutions could help adjust the daily demand curve to meet the supply curve.