What is load shedding?

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{"text":"I was just given a 2011 international prostar, and three times last night the truck would beep and a message would come on the dash saying \"load shedding\". Then all power to the sleeper was cut. What does this mean? Is there something wrong with my truck? I wasn't doing much, just had the heater on and charging my cell phone.","pics":"[]","canComment":true}