Technological innovations have unleashed the power of renewables such as wind, hydro, solar, and geothermal (地热).
2017年6月六级真题（第一套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
VERB
释放；放纵…而出
If you say that someone or something unleashes a powerful force, feeling, activity, or group, you mean that they suddenly start it or send it somewhere.