The 2003 Northeast blackout was a historical outlier. But extreme heat could make it much more common

Once rare, power blackouts will likely increase in frequency. The health effects could be disastrous.

In August 2003, 55 million people were plunged into darkness as a blackout covered swathes of the Northeast, spanning from Detroit to New York to Toronto. The four-day outage all started because extreme heat put unsustainable pressure on the power system.

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