Letters: Who makes these rules?

I recently received a notice from Southern California Edison about rate changes. I notice that the terms of my “Summer Discount Plan” also changed. Edison now says that I will only get the discount if I register at least 1.5 kWh of electrical load for the hour before or after the SDP event (air conditioner remotely shut off by Edison). If I fail this usage level, I will be removed from the program and not allowed to re-enroll for one year.
Last year, when I would learn there was to b