Peak demand? What about instant demand???
The crazy thing about electricity distribution is that the electricity produced by powerplants is used immediately. Your computer plugged into the wall is using electricity that was produced in a large generator seconds ago many miles away. There's no storage of the energy. The large electricity grids are connected machines that do their best to keep the voltage within acceptable limits between 110-120 volts at the average home. When more electricity is demanded by the grid it slows down the turbines and generators, when they can't keep up auxiliary natural gas plants and other powerplants come online to make up for it.
I used to work in Eaton's power quality division.
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