More than 180 Americans were under heat alerts Friday as a heat dome envelops large swaths of the U.S. The high temperatures were also taking a toll on the nation's largest power grid operator. Roxana Saberi has more.
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More than 180 Americans were under heat alerts Friday as a heat dome envelops large swaths of the U.S. The high temperatures were also taking a toll on the nation's largest power grid operator. Roxana Saberi has more.