Why wind turbine turns clockwise is not the most efficient The reason is little bit complicated. By day, the sun heats the earth as well as the air close to the ground. It helps the turbine blade rotor at the same speed and direction at all altitudes when the blade goes up and down. While at night, Coriolis force sheared wind at different altitudes and begets wind veer. In north hemisphere the wind veer turns into a turbulent wake when pass the wind turbine and hampering the wake’s ability to generate more vim on the downwind turbine. And in the southern, it all works the other way around. Thus we don’t need to change anything there. Even the new discovery sounds inspiring, we have to do more investigation to balance the cost of retooling the blade and extra output power squeezed out by doing so. At least, we acknowledged that a lot of apparently natural and conventional decisions made just by tossing a coin.But they still works economically.