I bet all the new gas-fired plants being built now are peaking plants, though.  Millions of dollars of natural gas power plants were cancelled a few years ago, when it became clear that supply was going to be a problem.  The ones still being built are the ones that have to be natural gas.  

It's an economic thing, at least according to my utility company.  The fuels for peaking plants are so expensive now that there's no way they're going to build baseload plants that use them.

A gas fired plant came on line this past summer about 1/4 mile from me. It is not a peak plant. It is a co-gen plant. Heats water for the University, 1.5 megawatts for the rest of us.