- SOLAR: luminous and thermal energy from the Sun
- WIND/EOLIC: kinetic energy from the wind.
- HIDROELECTRIC: kinetic energy from the water
- GEOTHERMAL: thermal energy from the inside of the Earth.
- BIOMASS: in the organic matter
NON-RENEWABLE: we use them faster than nature produces them. It contaminates more.
- NUCLEAR FUELS: uranium, plutonium... We burn them for energy. They cause radioactivity.