The practice of using energy in a sustained way that meets the current demand of energy without compromising the needs of future generations is known as sustainable energy. This type of energy is renewable. It is helpful in reducing greenhouse gas emissions and causes no damage to the environment. Solar energy is the energy that is obtained from the sun and is harnessed using a wide range of technologies such as photovoltaics, solar heating, solar thermal energy, etc. Wind energy is a type of sustainable energy which uses wind to provide mechanical power using wind turbines. Hydropower is the generation of electricity from the energy of falling or fast running water. Geothermal energy refers to the thermal energy which is generated and stored in the Earth's crust. This book unfolds the innovative aspects of sustainable energy which will be crucial for the holistic understanding of the subject matter. Sustainable energy is an upcoming field of science that has undergone rapid development over the past few decades. This book will serve as a reference to a broad spectrum of readers.