“Clean” vs. “New” Energy: You will very frequently encounter the term
新能源 (xīn néngyuán), which means “new energy.” In practice, especially in business and media, 新能源 and 清洁能源 are used almost interchangeably. 新能源 is often used when emphasizing the technological and innovative aspects, as in “new energy vehicles” (新能源汽车). For a learner, it's safe to treat them as near-synonyms, but 清洁能源 is slightly more formal and has a stronger emphasis on the environmental benefit.