The Walmart example of production is actually a good one. You go to the demand side and you use the flexibility that you have to help the grid. This is an example, I would say, of a truly smart grid application in which you don't just consume electricity blindly; you consume it when it's better for the grid. In the end, this could be done with financial incentives or it could be done with controls, but it's not necessarily about trying to control the loads. If you want to take your shower with hot water, you can still have hot water. It's more to use your water heater—as an example—as a storage unit and to play with the flexibility.
A lot of loads on the electrical grid have this flexibility inherent in their usage, so with the Walmart example, if you cut the air conditioning for a minute or two, it won't have a lot of impact on the store itself. If you cut it for two hours when it's very hot in the summer, then you will have impact. It's a kind of management of the variability. Right now electrical networks are doing that all the time. Now it's a question of using more of that flexibility that is out there, which can support the grid when it's needed.