Managers of the state’s biggest electrical grid say peak electricity demand has topped 69,000 megawatts for the first time.

The Electric Reliability Council of Texas, which operates that grid that covers most of the state, says demand peaked at 69,408 megawatts between 3 p.m. and 4 p.m. on Monday, then 69,783 megawatts between 4 p.m. and 5 p.m.

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