Solar.

Nature Energies develops and operates solar plants integrated to buildings, and on the ground. Solar power converts sunlight into electricity through the photovoltaic effect in a solar cell.
It fulfills two functions: photogeneration of charge carriers (electrons and holes) in a light-absorbing material, and separation of the charge carriers to a conductive contact that will transmit the electricity (simply put, carrying electrons off through a metal contact into a wire or other circuit).

Wind.

Nature Energies develops wind farms in the US and in France.
Wind power is the conversion of wind energy into useful form, such as electricity, using wind turbines. Wind energy is plentiful, renewable, widely distributed, clean, and reduces greenhouse gas emissions when it displaces fossil-fuel-derived electricity.

Hydro.

Nature Energies develops small hydro plants in France.

Hydroelectric power comes from the potential energy of dammed water driving a water turbine and generator. It is a renewable source of energy, produces no waste, and does not produce carbon dioxide (CO2) which contributes to greenhouse gases.

Biomass

Nature Energies manages biomass projects from biodegradable wastes that are transformed into gaz, and then burnt as fuel.