According to Inhabitat, the Sonnenschiff and Solarsiedlung — located in Freiburg, Germany, — is a self-sustaining city that uses smart solar design along with a multitude of photovoltaic panels pointed in the direction of the sun. Both were designed by Rolf Disch in which the Sonnenschiff (Solar Ship) and Solarsiedlung (Solar Village) put major emphasis on power production through a series of large rooftop solar arrays that double as sun shades. It should also be noted the rooftops are built to a standard known as “Passivhaus,” which allows energy production to be four times the amount than what is consumed.
Read more at http://www.inquisitr.com/1982709/germany-builds-a-solar-city-that-produces-four-times-the-energy-it-consumes-video/#y0W1W0gjyUIyXM4L.99