The only thing you would have to do to make this happen is to change electricity pricing from a fixed rate to a dynamic rate based on actual market conditions, along with a standardized way of accessing current pricing. This would drive consumers to shift their behaviors to take advantage of cheap prices, and smart appliances could access the price feed to make decisions like the ones you mention. Another simple one is washing machines, dryers and dishwasher offering to delay their start time to coincide with the cheapest energy price within X hours.

The issue is that most consumers don't like unpredictable prices. You can make a crude approximation by having 2-3 fixed rates for different times of day, but that leaves a lot of potential on the table