Yes, that's a good one. Can even be automated to some extent using smart thermostats. Water heating too. Even without the thermal storage element though, there are lots of loads than can be shifted using a financial incentive. Clothes washing and drying is a good one. Electric vehicle charging too. Even if they aren't used to feed back into the grid, just having people charge when power is plentiful will make a big difference as more electric vehicles are added to the system.