Renewable energies (also known as regenerative energies) are energy sources that are constantly reproducing themselves and are available virtually indefinitely. This characteristic distinguishes renewable energy sources from fossil energy sources, which take millions of years to regenerate. Examples of renewable forms of energy are solar energy, wind power, hydropower and sustainably produced biomass. By increasing the use of renewable energies, we are creating a sustainable and future-proof energy supply and conserving our planet's resources.