Clean energy refers to energy generated from recyclable sources without emitting greenhouse gases. There is confusion and debate on the definitions of clean, renewable, and green energy such as whether clean energy includes sources that generate environmental side effects besides emissions. Clean energy sources include wind, solar, tidal, and geothermal power as well as hydro, biomass, and nuclear power depending on the definition of clean energy.
[Last updated in June of 2021 by the Wex Definitions Team]