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Extreme heat wave threatens U.S. power grids and July 4 travel

CNBC · Jul 3, 2026, 8:06 AM · Also reported by 4 other sources

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  • A prolonged and dangerous period of extreme heat across the central and eastern U.S. is poised to continue into the Independence Day weekend, exposing pressure points for power markets and transport.
  • Temperatures of up to 105 degrees Fahrenheit (40.5 degrees Celsius) are expected, according to the National Weather Service, with some daily, monthly and all-time records possible.

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A prolonged and dangerous period of extreme heat across the central and eastern U.S. is poised to continue into the Independence Day weekend, exposing pressure points for power markets and transport.

Temperatures of up to 105 degrees Fahrenheit (40.5 degrees Celsius) are expected, according to the National Weather Service, with some daily, monthly and all-time records possible.

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