At 3:38 a.m., according to scanner traffic, FDNY personnel were still battling an earlier Con Ed transformer plant explosion blamed for the massive power outage in NYC. Watch:

Many Twitter users witnessed it in real time:


NYT Metro Desk:

At least 660,000 people in New York had lost power as of late Monday night, the result of a higher than normal storm surge, a planned power shut-down and an explosion at a substation in Manhattan, John Miksad, a senior vice-president at Consolidated Edison said in a news briefing.

The explosion occurred on Monday evening at a substation in the vicinity of 14th Street and the FDR Drive, Mr. Miksad said. The precise cause of the blast was unknown, but Mr. Miksad said flood waters or flying debris could have been involved. It knocked out power to about 250,000 people, he said.