Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.The present-day renewable-energy industry is an energy industry focusing on new and appropriate renewable energy technologies, which excludes large-scale hydro-electricity. Investors worldwide have paid much greater attention to this emerging renewable energy industry in recent years. In many cases, this has translated into rapid renewable energy commercialization and considerable industry expansion. The wind power and solar photovoltaics industries provide good examples of this.