The book provides a comprehensive review of renewable energy from an economic perspective throughout the last two hundred years, starting from traditional renewable energy based on bio and hydro energy. The focus is on modern renewable energy based on geothermal, wind, and solar energy. It emerged when innovative entrepreneurs captured opportunities for valuable energy services. As the services with renewable energy expanded, the costs of technologies decreased entailing global commercialisation. This enables larger access to energy and emission reduction of carbon dioxide, but also causes larger differences in the energy resources across countries which impedes international policies. That optimistic viewpoint on the shift to the global