Most of the remote rural areas of Ethiopia are not yet electrified. Electrifying these remote areas by extending grid system is difficult and costly. As the current international trend in rural electrification is to utilize renewable energy resources; solar, wind, biomass, and micro hydro power systems can be seen as alternatives. Among these, wind and solar energy systems are thought to be ideal solution for rural electrification due to abundant solar radiation and significant wind distribution availability nearby the rural community in Ethiopia. This book has been written to satisfy the interest of readers on renewable energy technologies and utilization. The primary reason which motivated the author was to provide some initial information to people who are embarking on a career in the renewable energy technologies and utilization in developing countries like Ethiopia. It is this group of people that the present book is targeted at. This book is organized into six chapters. It covers basic concepts of wind and solar energy technologies, their potential resources and utilization in Ethiopia. Besides it provide thorough discussion on design of hybrid power generation system.