Why Aren’t Those Wind Turbines Turning?

It’s called curtailment—and it could be costing the nation a lot of green energy and green money. . Some 292,000 megawatt-hours of wind power were curtailed by the Midwest transmission system operator in 2009; in 2010, that figure jumped to about 824,000 megawatt-hours. At a rule-of-thumb 7 cents per kilowatt-hour, …