This Book is very useful for Engineers and Managers for various organizations. The Book is written for the students of Science and Technology. It covers various fundamental concepts related to Energy conservation and Audit. We hope that readers will be enriched by knowledge and information through this book. The various types of Energy sources such as solar, wind, tidal, hydro power, thermal, etc are covered in this book. The importance of Energy conservation is also explained. The procedure for various types of Energy audits are also explained with the help of audit formats.