The Indian Point II nuclear reactor was returned to service Saturday after a four-month outage that resulted when routine generator repairs took longer than expected, a utility spokeswoman said.
The reactor was operating at 30 percent of capacity by 9 a.m., said Lisa Robinson, a spokeswoman for the Consolidated Edison Co., which operates the plant.
She said it would be operating at full capacity within several days.
It was shut down four months ago to repair and inspect the plant's four steam generators "but we expanded the inspection process on the generator and that took more time than anticipated," she said.
During the quarter-year span, the utility purchased replacement power when it needed it.
"No one would have turned on their lights and not been able to have power," he said.
Buchanan is in Westchester County north of New York City.