Today in History 1965: The Great Northeast Blackout At dusk, the biggest power failure in U.S. history occurs as all of New York state, portions of seven neighboring states, and parts of eastern Canada are plunged into darkness. The Great Northeast Blackout began at the height of rush hour, delaying millions of commuters, trapping 800,000 people in New York’s subways, and stranding thousands more in office buildings, elevators, and trains. Ten thousand National Guardsmen and 5,000 off-duty polic