Parts of the Midcontinent Independent System Operator region are running more than 20F (11C) hotter than normal, and the National Weather Service sees triple-digit temperatures across the South through at least Sunday. St. Louis is forecast to hit 99F (37C) with a heat advisory through late Saturday - about 18F above the seasonal norm. The heat wave hit precisely during the period when power-plant crews had planned to shut down critical equipment for fall upkeep - a timeframe that typically begins once cooler conditions reduce air-conditioning loads. That window is getting squeezed by erratic weather tied to both human-driven climate change and natural patterns like El Niño, leaving fewer truly quiet weeks to fix gear.
MISO reported about 51 gigawatts of generation out Thursday while forecasting demand at 105.2 gigawatts. Next door, PJM Interconnection LLC - covering areas including Chicago, Washington DC, and Virginia's Data Center Alley - reported localized reserve tightness and told a subset of large commercial and industrial users to cut back. PJM projects demand will exceed 132 gigawatts while close to 37 gigawatts are unavailable.
PJM officials asked the US Department of Energy on Wednesday to waive certain emissions rules so plants can run at full tilt. On Thursday, the agency authorized the deployment of backup generation to reduce the risk of shortages. At PJM's Western Hub, real-time prices spiked past $4,300 per megawatt-hour shortly after 6 p.m.
Wednesday local time. In PJM's posted data, notes indicate Sept. 17 readings reflect conditions as of 12:50 p.m. in New York.
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Following a summer of extreme heat that led to multiple federal directives to operate at maximum output, aging facilities are under pressure as factory demand and data centers continue to expand. The artificial intelligence boom is adding to the pull on the grid. "PJM's generation fleet is starting to show signs of its age when trying to stay working," said Gary Cunningham, a director at Tradition Energy, who also anticipates wholesale prices staying high through Thursday in Virginia, Ohio, Kentucky, and the western portion of Pennsylvania. In an email, he wrote that unseasonable weather "plays well into the narrative of PJM needing more generation capacity, and needing it NOW, even before new demands to meet data center requirements come."
What this adds up to for your wallet: if you live or invest in regions like the Mid-Atlantic or Midwest, watch how sustained heat and rising data center loads keep pressure on power reliability and wholesale prices. It is a reminder that energy costs and availability can swing fast when maintenance calendars collide with extreme weather.
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