November 9, 1965
Today In History
The Great Northeast Blackout
On Tuesday November 9, 1965, over 30 million people and 80,000 square miles were left without electricity for up to 13 hours in the Northeast. New York, Massachusetts, Connecticut, Rhode Island, Vermont, and New Jersey were affected. As was common on a cold November evening, power for heating, lighting and cooking was pushing the electrical system to near its peak capacity. At 5:16 p.m. Eastern Time a small surge of power coming from the Robert Moses generating plant in Lewiston, New York caused the improperly set relay to trip at far below the line's rated capacity, disabling a main power line and instantly, the power that was flowing on the tripped line transferred to the other lines, causing them all to become overloaded. The investigation found that the cause of the failure was human error when maintenance personnel incorrectly set a protective relay on one of the transmission lines too low.
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