Solar Power is free energy for you.

There are two main types of Solar power collectors, the first is Photovoltaic and the second is Solar Thermal.
Solar Photovoltaic refers to the conversion of sunlight into an electrical current.
This method is probably the most widely known way of producing electricity and has three dominant types that equal 99% of the market today..

(A) Monocrystalline.. (crystalline technology) 11to 15% efficiency, uniform blue in colour and is the oldest and most efficient PV cell, slow and expensive to produce.

(B) Polycrystalline.. (crystalline technology) 11 to 13 % efficiency, irregular blue colour, less expensive to produce with simpler manufacturing process.

(C) Amorphous.. (thin film Technology) 4 to 8% efficiency, considerably less expensive to produce, light and flexible so can meet a range of applications.

Solar Thermal mostly refers to heating water with the heat of the sun.
There are three main types..
Active Solar
Flat Plate.
Evacuated Tubes.
If you are reasonable at DIY then you can build your own solar collectors to provide you with hot water and electrical power to enable you to live off grid, as they say.