The cost of electricity for the loads I can control, such as those other heating or cooling living space, would have to 10x for it to be worth worrying about the cost, which would mean a $1400/MWH. The ceiling on the wholesale market price in ontario, last time I checked, was $2000/MWH.
I can see the price of electricity rising quite a bit across the board, but I don’t think people are going to inconvenience themselves at all to respond to it.