“…One interpretation refers to energy sources other than coal, oil, natural gas, and thermal power, including hydropower, nuclear power, solar power, wind power, and biomass [ 32 , 33 ]. Shi et al [ 34 ], in their assessment of clean energy generation in China's provinces and municipalities, define it as the sum of four types of power generation: solar power, wind power, hydroelectricity, and nuclear power. Some definitions equate clean energy with renewable energy, encompassing all recyclable energy sources [ 35 ].…”