Rotterdam company Archimedes has created a small windmill that can be installed on just about any roof. LIAM is a quiet, affordable wind energy source that works well even in urban environments; it’s compact and quiet, and its yearly output averages between 300 and 2500 kilowatts, depending on wind speed and roof height. You can also place more than one of these windmills on your roof for added power, or combine them with solar panels so you have a backup source of energy on still days. The price in the Netherlands will be € 3,999 (approximately $5,452 USD), and a mini-LIAM will soon be available as well. These turbines will be available for consumers to order as of June 1st, 2014.