Climate change and foreseen high fuel prices play an important role in the development of alternative energy sources. Renewable energy concerns the sources, which are not expected to be depleted in a time frame relevant to the human race. This new and important edited volume gathers the latest research from around the globe in the study of renewable energy sources and highlights such topics as economics, emerging technologies and global practices including energy policies. It provides an insight into the current trends in the field of renewable energy, which are expected to play an important role in future sustainable energy systems. It is not by any means exhaustive, nor is it intended to be, but provides an overview of current research advancements in the field. This edited volume can serve as a reference text for researchers in the field of sustainable energy systems including energy economics, energy planners, electric utility managers, energy regulators, consultants, policy makers and economists.