7. Maintains altitude using HeliumThe wind moves faster at higher altitudes, from sea level until an altitude of 10,000 m. Winds also become more consistent as altitude is increased. These effects are caused by friction with the Earth’s surface, which slows the wind down. This means more energy is available in higher altitude winds, measured by wind power density (units – kW/m2). Prototypes 240kW FEG At 10,000 m, the wind power density is a maximum over the regions visited by the Polar Jet Streams, which includes Japan and the eastern United States. At 1,000 m, the wind power density is a maximum over the Southern Ocean. To be more specific, the best locations for high-altitude wind turbines include Japan, the Eastern US, Egypt, Israel, Australia, and others. 10kW MARS