This edited book is a comprehensive collection of chapters on various clean energy technology such as solar energy, waste biomass as energy, hydro-electricity generation, biodiesel production from biomass and strategies to cater the demand of clean renewable energy. Clean energy technologies also enhance economic growth by increasing the supply of energy demand and tackling environmental challenges and their impacts due to the use of other conventional sources of energy. The conventional/non-conventional energy production methods are efficient but it has adverse effects on environment and human health. As environmental concerns are not avoidable therefore the necessity of clean energy production comes in to the picture.