said by zoom314 
: But the ability to turn off an appliance remotely has as about as much chance of becoming real as someone filling up the Grand Canyon on Mars with Liquid water anytime soon.
That capability has been implemented on a voluntary basis in exchange for lower rates for decades. They install a small radio-controlled relay on your air conditioner. Some folks opt for "interruptible rates" which allow the power company to shut you down entirely for a couple of hours. This isn't as exotic as you may think.
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