Wind power is generated through large groups of massive industrial wind turbines, sometimes as tall as 50-story skyscrapers. Like the wind itself, wind power is intermittent and extremely unreliable. The wind must be strong enough, but not too strong, to generate power. So wind cannot be used for baseload generation nor to meet peak demand. For example, to avoid a blackout, a Texas grid manager recently had to cut off electricity to some customers, in large part due to a sudden drop in wind power.