This volume is first part of the five-part set on bioenergy research. This volume covers current developments and both basic and advanced concepts in bioenergy production. Based on bioenergy road map, the book will also evaluate about the ratio existing between current challenges associated and practical implementation of these biofuels. The book complies up to-date progressive development in available bioenergy options and discusses opportunities and existing risks. The main objective of the book is to provide insights into the opportunities and required actions for the development of an economically viable bioenergy industry for practical replacement of fossil fuels. This book is of interest to teachers, researchers, scientists, capacity builders and policymakers. Also the book serves as additional reading material for undergraduate and graduate students of environmental sciences. National and international bioenergy scientists, policy makers will also find this to be a useful read. Other four volumes of this set explore latest developments, commercial opportunities, waste to energy and integrated solution for bioenergy concerns.