Electrical installation & energy efficiency

Dear Indian Engineers

I m searching an invention of small electricity generation plant from natural resources like sun & rain. Which is useful for small houses / flats in apartments. It may cover one or two Sq meter place for installation & should be affordable to individuals. If any such invention is known to you then pls contact me on my mail ID. I m interested in developing & selling the plant at commercial level.

This is for

Saving power energy

low cost to individual

continous inhouse supply

support to villegiors

Regards

Apara