Solar Panels, for CIVIL discussion

Interesting. I've been tasked with determining if solar is a viable solution for one of my parent's rentals. Small house, built in the 1970s. PG&E (Pacific Graft and Extortion as they are generally called) bill was $700 last month. By comparison ours was a little under $300 in our small house that was built in 1980. Might also need to do an energy audit on the house...
Wow you guys are getting hosed. My gas and electric averages $400/month and I live in a 100 year old brick house with original windows and no insulation in the walls. Just a little blown in the attic. Oh and it get's -20° below in the winter here.