![The lights of lower Manhattan blaze under the Brooklyn Bridge as electricity returned to New York City Aug. 15, following the largest power outage in U.S. history.](https://npr.brightspotcdn.com/dims4/default/7ff27bf/2147483647/strip/true/crop/140x96+0+0/resize/880x603!/quality/90/?url=https%3A%2F%2Fmedia.npr.org%2Fprograms%2Fatc%2Ffeatures%2F2003%2Faug%2Fblackout%2Freuters%2Fnewyork.030815-965711e07a8ef5d7cdaf2693a3613b047614a495.jpg)
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![The New York City subway returns to service after a 33-hour stoppage due to the blackout.](https://npr.brightspotcdn.com/dims4/default/72e4742/2147483647/strip/true/crop/140x94+0+0/resize/880x591!/quality/90/?url=https%3A%2F%2Fmedia.npr.org%2Fprograms%2Fatc%2Ffeatures%2F2003%2Faug%2Fblackout%2Freuters%2Fsubway140-790ce030b3e497b3f94991c1840c92eed492e648.jpg)
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Congress opens its investigation into the cause of the largest electrical outage in U.S. history. Two other probes -- one by a joint U.S.-Canadian task force and the other by the North American Electric Reliability Council -- are already under way. Analysts express concern over possible conflicting recommendations. Hear NPR's David Kestenbaum.
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