[worthless-trash]

I assure you first hand, you can turn on the heater (during winter) or airconditioner without battery and take advantage of this.

You can wash your clothes during this time to take advantage on this.

You can cook on the electric stove during this time to take advantage of this.

No battery is required to do this. I can't connect your logic to my reality.

[hahahaa]

It is the extra $/kwh you pay out of those 3 hours subsidizing the free time that will be the issue. So you need to order a large round during happy hour and make those beers last. Somewhat possible by overcooling or overheating but you need a battery ideally.