I have only one reservation, and it is this:
They give you $150, and then attach this device to your water heater. How long does it stay there?
Do you get any kind of a break on your utility bill?
When I installed my water heater I also put on a timer, which while not doing the utility any favors, does give me a measure of control of when the water heater is putting a load on the system. It's for my good, not theirs.
I think the smart grid is a good idea, but the one-time payment sounds a little light to me if the device might be there for years.
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