This book gives a detailed account of the rise of modern wind energy technology in California and Denmark. In Denmark, groups of neighbors stimulated its decentralized, small-scale use and gradual development, while futuristic looking large-scale wind farms sprouted like mushrooms on the Californian hills. However, the thriving Californian market dit not result in a succesfull American wind turbine industry. In contrast, the Danish industry currently produces more than half the world output of turbines. Rinie van Est explains the marked differences between the two countries by looking at the way in which policy makers, technicians and entrepreneurs - in interplay - shaped the development of wind power.