Reddy Kilowatt Works Up a Sweat - NYTimes.com
But this summer, the Midwest Independent System Operator, which covers an area from Michigan to Manitoba to the Dakotas, blew through its record on July 20. That system serves about 40.3 million people.
Just to the east, the PJM Interconnection, which covers parts of 13 states and a population of 58 million people, set its record the following day. Both of those systems managed with little difficulty.
The Southwest Power Pool, which covers parts of nine states, including Nebraska, Kansas, Oklahoma, New Mexico and part of Texas, with a population of 15.5 million, set records on Monday and Tuesday, and repeatedly asked for customer help in limiting consumption in the hot afternoons.
And more trouble in Texas due to ERCOT's isolation:
It was hit hard this week, and by Thursday it had declared that conservation was critical and rotating blackouts were a possibility. Power prices on the spot market jumped to 100 times their normal levels.
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