They bolt the blades to a heavy-duty table that vibrates faster than the eye can see. The setup subjects the blades to acceleration forces approaching 10 g, double what a racecar driver might experience when making a turn at a motorway.
One such machine is the GE 2.5-120 wind turbine – the numbers stand for 2.5 megawatts in output and 120 meters (393 feet) in rotor diameter. Last year, construction crews installed 14 of them at a wind farm near Rehborn, Germany.
That’s because power plants use water for cooling equipment and a lack of water can lead to plant outages. “The state of Texas is still experiencing severe drought and power plants typically need a lot of water,” says Bill Harris, a spokesman for Exelon Corp., one of the largest U.S. utilities. “We’ve got to keep that in mind.”
But Egypt’s demand for electricity is already outstripping supply, and the government is seeking fast ways to boost it. GE has found one.