as well as the commercial ones. yours will cost less than $200.00 in materials and will power t.v., lights, and other appliances just like the expensive ones.
wind generator; you can build your own wind generator. using common, easy to find, and inexpensive parts, you can build your own wind generator that will work just like the ones that sell for $700.00 and up to thousands. it will do just as good of a job as any you could buy.
solar water heater; it is very cheap and easy to build a solar water heater, nothing to wear out. it uses only the free energy of the sun. you can use it 