Renewable energy sources are the ones that are readily available and can be replenished in shorter span of time than the non-renewable sources. Wind energy, solar energy, tidal energy, bioenergy and geothermal energy are some of the main renewable sources in use and under consideration for improved technologies. Effective utilization of these sources would greatly benefit humankind as it will reduce air pollution and global warming drastically. The various studies that are constantly contributing towards advancing technologies and evolution of this field are examined in detail in this book. From theories to research to practical applications, case studies related to all contemporary topics of relevance to this field have been included in this book. It will help the readers in keeping pace with the rapid changes in this area of study.