I think have invented the worlds cheapest and simplest form of wind turbine which can produce 4.9 amps at almost 300 rpm.To my surprice i have not been able to find a buyer.

sam . - Description added by: INDIA.

Solar PV (photovoltaic) systems generate electricity when sunlight falls on solar panels which are normally made of crystalline silicon and mounted on the roof of the home or other building. Although a great deal of energy is consumed in the manufacture of PV systems, one installed they should continue to produce virtually free electricity for up to 20 years. - Description added by: www.microchap.info