Outage Probe Eyes 'Erie Loop' The search for the cause of the biggest blackout in U.S. history is focused on the so-called "Erie Loop" -- a network of transmission lines connecting Northern Ohio and Michigan with parts of Ontario. Experts had warned the power grid was vulnerable in that location. NPR's Greg Allen reports.
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Blackout Probe Focuses on 'Erie Loop'

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Blackout Probe Focuses on 'Erie Loop'

Blackout Probe Focuses on 'Erie Loop'

Blackout Probe Focuses on 'Erie Loop'

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  • <iframe src="https://www.npr.org/player/embed/1405500/1405501" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

The search for the cause of the biggest blackout in U.S. history is focused on the so-called "Erie Loop" — a network of transmission lines connecting Northern Ohio and Michigan with parts of Ontario. Experts had warned the power grid was vulnerable in that location. NPR's Greg Allen reports.