Those sources of energy which are naturally replenished are called renewable resources. The energy derived from them is known as renewable energy. It is an environment-friendly source of energy. It refers to the energy derived from natural resources, like sun, water, wind, etc. Some of the most successful forms of renewable energy are solar power, hydropower, wind energy, etc. The varied aspects of renewable energy along with technological progress that have future implications are glanced at in this book. The topics in the text are apt for the readers as they provide thorough insights about this vast field. This textbook is meant for students who are looking for an elaborate reference guide on renewable energy.