Denmark raised eyebrows on Thursday by producing 140% of its electricity needs with only its wind farms. Granted, it was "an unusually windy day," the Independent reports, but the Danes had enough left over to share surplus power with Germany, Norway, and Sweden. "It shows that a world powered 100% by renewable energy is no fantasy," a spokesman for the European Wind Energy Association tells the Guardian. "Wind energy and renewables can be a solution to decarbonisation—and also security of supply at times of high demand." Normally, Denmark's main energy source is coal, with wind power supplying just 29%. You can follow Denmark's real-time supply of wind-farm power at energinet.dk. (Or see why Danes have been called the world's "happiest people.")