My house is on a peak/off-peak schedule, with the peak rate being based on highest demand during the peak hours, which are at specific hours of the day, with a set summer and a set winter (rest of the year) schedule. We have a demand control computer that limits the peak demand during on-peak hours. It monitors the rate of consumption, and it has direct control of the water heater, and X-10 control of the heating and air-conditioning to limit the peak amount used, but only during on-peak periods. We do our own time-based control of the rest of the appliances, like we don't do laundry or run the dishwasher during peak hours, etc. It doesn't require smart appliances.