noun
natural energy; renewable energy
Typically refers to renewable energy sources such as solar, wind, hydro, geothermal, and biomass. Used in environmental and policy contexts.
日本は自然エネルギーの利用を拡大しようとしている。
Japan is trying to expand the use of natural energy.
自然エネルギーは化石燃料
Natural energy is an important alternative to fossil fuels.