BOULDER, Colo. -- On Sunday nights, Philip DiStefano fills up his car. In most towns, this would not be a noteworthy event, but in this campus town, it is. DiStefano is chancellor of the University of Colorado's sprawling campus here, and his car, a hulking Ford Escape, gets 54 miles per gallon. That's because it is a plug-in hybrid and he fills it by plugging into the wall in his garage. As he and most other residents here readily admit, Boulder is not a normal American city. That is one reason why Boulder and DiStefano's embassy-like home have been selected for the first big demonstration of the value of what is called the "smart grid" concept.