The Energy Challenge

Mike Groll/Associated Press

When the builders of the Maple Ridge Wind farm spent $320 million to put nearly 200 wind turbines in upstate New York, the idea was to get paid for producing electricity. But at times, regional electric lines have been so congested that Maple Ridge has been forced to shut down even with a brisk wind blowing. By MATTHEW L. WALD

Wind Energy Bumps Into Power Grid’s Limits