A massive, sudden reduction of electricity going into northern Ohio along the shores of Lake Erie appears to have played a role in the cascading blackout that affected eight states, according to a timeline of events released by investigators.
The U.S.-Canadian task force investigating the Aug. 14 blackout emphasized Friday that it has yet to determine how the sequence of events before the blackout are related or what role any of them might have had in causing the blackout to cascade over such a wide area.
A detailed timeline of events during the roughly four hours leading up to the blackout showed Midwest power systems plagued by a myriad problems from power plants shutting down and high-voltage lines tripping to significant declines in the voltage levels that are needed to push electrons through the transmission lines.
"What we see so far is that a voltage collapse caused plants and power lines to disconnect. But that doesn't answer why those things happened," Energy Secretary Spencer Abraham cautioned Friday as the task force he co-chairs issued its first findings.
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