"Renewable energy" refers to energy sources that are replenished naturally and can be used repeatedly, such as solar, wind, hydro, geothermal, and biomass.

Examples:

Solar energy is a clean and renewable source of power.
(太阳能是一种干净和可再生的能源)
Wind turbines are becoming an increasingly popular method of harnessing renewable energy.
(风力涡轮机正在成为利用可再生能源的越来越受欢迎的方法)
Biomass is a renewable source of energy derived from organic matter.
(生物质是一种从有机物质中获得的可再生能源)