|Asia-Pacific Economic Cooperation (APEC)European Commission - EurostatRenewable energies cover primary electricity from wind and hydro, solar energy, biomass and wastes and geothermal energy. Hydro power covers potential and kinetic energy of water converted into electricity in hydroelectric plants. The electricity generated in pumped storage plants is not included. Wind energy covers the kinetic energy of wind converted into electricity in wind turbines. International Energy Agency (IEA)One can find numerous definitions of renewables in technical literature, including the following one: renewable energy is energy that is derived from natural processes that are replenished constantly. Although this definition leads to some issues, dealing for instance with the time horizon for the replenishment, is the one which best describes renewables.
There are various forms of renewable energy, deriving directly or indirectly from the sun, or heat generated deep within the earth. They include energy generated from solar, wind, biomass, geothermal, hydropower and ocean resources, solid biomass, biogas and liquid biofuels.
Often associated with renewables, it also includes a non-renewable component: waste. Waste is a fuel consisting of many materials coming from combustible industrial, institutional, hospital and household waste such as rubber, plastic, waste fossil oils and other similar commodities. It is either solid or liquid in form, renewable or non-renewable, biodegradable or non-biodegradable.Latin American Energy Organization (OLADE)Renewable energy is considered to be all non–fossil resources, with a low carbon content and relatively short formation periods.