Wind power Some useful bits of information we have been using are: The most efficient a wind turbine can be is 57%. The energy per square meter when the wind blows at 2 meters/sec (7.2km/hr) is 4.8 watt/hrs (100%). But at 4 meters/sec (14.2km/hr) the amount of energy is 38 watt/hrs per square meter(100%). We have a anemometer and at present is recording data. More researching is being done in this area.