Most of the homeowners across US can switch to green energy without having to install a roof full of Solar panels. It does not cost you a dime in most cases. All you need to do is call your local utility and switch. If your utility is one of the more advanced one they might even allow you to do the switch on their website.

EPA has a great website for locating Green Energy Providers in your neighborhood. http://www.epa.gov/greenpower/pubs/gplocator.htm