The occurrence of global warming and the increasingly negative impacts of climate change are forcing governments across the globe to implement measures to generate a larger proportion of energy from renewable sources. So,these days energy plays a key role in many industries. According to the International Energy Agency, improved energy efficiency in buildings, industrial processes and transportation could reduce the world's energy needs in 2050 by one third, and help control global emissions of greenhouse gases. In this book, the main steps in order to reduce energy consumption have been presented in 13 chapters. The book can use not only in dairy industry but also in many other industries, like, power plant, food industry, and building industry. It is my duty to appreciate Mr. Paydari for his great support in writing this book.