The most known 3 sources of energy are: the wind (windmill), the sun (solar panel), and the water (hydraulics). These 3 renewable sources of energy are presented here because it is those who offer really effective products to a realistic cost and with a mode of functioning and maintenance within the reach of all and today.
The wind turbine : uses the power of the wind to activate a generator which produces electricity.
The solar energy capture the sunlight either to use directly its heat, or to produce electricity.
The hydraulics uses the force of the water either to activate a generator which produces electricity, or to activate a pump (Bélier hydraulic) which allows to accumulate some water in a point higher than its point of origin without the other energy than the water itself.
Each of these renewable energies is here detailed. Advantages, inconveniences and specificities are exposed. Links towards companies and existing products are also proposed to continue your researches further.