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Where do you draw the line? "Griddy, please turn my power off if the price goes above $1/kwh"... "Griddy, please turn the power off if I forget to pay the bill.", "Griddy, I'll take a $10/month discount if the power gets turned off when my bill is paid late?", "Griddy, I want to use non-ripoff plan, so I'm happy for you to turn my power off the minute I pay late".
See how it isn't really feasible to stop power companies forcibly illegally disconnecting debtors if you allow a debtor to agree to be disconnected voluntarily?