Check out the link below:
Suntech (NYSE: STP) has built in solar panels into their front facade of their new HQ. The array, which can generate up to 1 MegaWatt, is plugged into the local electrical grid. The company claims to be the world's largest photovoltaic (PV) module manufacturer and I think they are today.
Just something to think about as the green revolution starts to take hold in the next few years. Architechts will have the capacity to build buildings that will generate MORE power than they use as technological advances in solar power will enable this to occur. Obviously having such a large solar exposure helps. This probably wouldn't be as beneficial in NY, NY :)