November 9, 2026: Right in 1963, Wrong by 1965

On the evening of November 9, 1965, a single protective relay at the Sir Adam Beck Hydroelectric Power Station Number 2 in Queenston, Ontario, near Niagara Falls, tripped and set off a chain reaction across the interconnected power grid.

Within minutes, about 30 million people across the Northeast United States and the Canadian province of Ontario lost power, some for as long as 13 hours. In New York City, the lights went out at the height of rush hour, stranding around 800,000 people on subway trains.

The relay wasn't broken. Back in 1963, engineers at Ontario Hydro had deliberately set it to trip at 375 megawatts so it would work in step with other protective equipment. As demand grew, the flow on that line crept to 365 megawatts, and nobody went back to revisit the setting. At 5:16 p.m., a small power fluctuation pushed the line past the limit. The relay shut it off, the remaining lines overloaded, and the failure spread through utilities that had linked their systems together to make the grid more reliable.

President Lyndon Johnson ordered Federal Power Commission chairman Joseph Swidler to investigate, and the commission's report confirmed that a safety device had done its job with a number that no longer fit the system. In response, utilities formed the Northeast Power Coordinating Council in 1966 and a national reliability council, now known as NERC, in 1968. The story shows how safeguards built on outdated assumptions can turn a connected system's strength into a shared weakness.

Written and hosted by Ron Trucks. Research and editing by Rodney Russ. Sound design by Angela Cahoy. Music by Cody Martin and Soundstripe.

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