Would be nice if you can save more then 80% on your energy cost. Some companies claim exactly that if you purchase their plans for home made/residential wind & solar power systems. I finally found an article on Michael Harvey and his cost saving energy solution, Earth4Energy. I bought his plans for less then $50 and I build myself a residential wind power generator for less then $200 which now powers all my household appliances. Can you imagine the savings? Michael also has a plan to build a residential solar power system for less then $100.
The opportunies for savings are amazing, additionally, please think how great this is for the environment!