This book contains selected papers presented during technical and plenary sessions at the World Renewable Energy Congress, the world's premier conference on renewable energy and sustainable development. This biennial Congress provides an international forum that brings together top experts, policy makers and business practitioners to address the most strategic issues of sustainable energy development and innovation. The book highlights the most current research and technological breakthroughs in this rapidly growing field and contains the most up-to-date innovations and practical applications in renewable energy development, utilization and energy efficiency efforts.