How can I get my house converted to work on solar energy and is it expensive?

I saw an episode in extreme makeover home edition were they built a house for a family and they used solar energy to power the house I like that not just because is good for the envirorment but because I think is better for us too, If we take care of the Earth we live in I think is going to last more.
I came accross a new, proven and tested home made wind power system and solar power system which eliminates our electricity bills. It was written by a Renewable energy enthusiasts Michael Harvey the diy called Earth4energy. You can get your copy to save energy and help environment while eliminating your power bills.