Mea cupla for not meeting the precise numerical content requested.

There are ice storms not put in that list that wiped out the power grid in several states, one in 2004 knocked out power to most of NY, Ohio, PA, WV, VA, and a huge swath of Canada.

If Irene had knocked out power to NYC, then you could say that 12 million people had their power knocked out..........but it would have been for a very short period of time, as urban areas have dense power grids and customers are quickly brought back on line. The number of affected customers is a lousy metric for how much damage an incident has done.

In the 2004 ice storm, there were people in upstate NY who went without power for a few weeks in the dead of winter. They fired up their generators and moved on. The restaurant where we ate breakfast was running off of a tractor generator for a couple of weeks.