Book excerpt: This book aims to provide the reader with useful information in the realm of biofuels such as biogas, biodiesel and bioethanol. This book is hoped to contribute to the consolidation of knowledge in the different fields. It briefly describes the use of biofuels just to use them as a source of energy. The expected energy produced can be used to replace energy obtained from nonrenewable fossil fuels such as petroleum. The problems caused from burning of fossil fuels such as petroleum, fire wood consumption which leads to deforestation, the health effects of humans as well as environment problems such as global warming, occurs due to the emission of greenhouse gases aspires me to write this book entitled as Biodiesel, Bio-ethanol and Biogas as an Alternative fuels. Generally, this book deals with the process of producing Biogas, Bio-ethanol and Biodiesel besides, the factors affecting the production of all these renewable energy sources. Based on this fact, anyone in the world can buy this book and use it as a reference book, to produce these energy sources from different wastes.