MISO's August demand rose compared to a year ago, while prices dropped by nearly two-thirds.
MISO officials said they probably could have held off their decision to call a summertime emergency in late August.
MISO instated maximum generation procedures Thursday to manage a pervasive heat wave blanketing its footprint.
MISO presided over routine operations in June, with an average 81-GW load and diminished wholesale prices.
Temperatures in Austin topped out at 105 degrees Fahrenheit, helping ERCOT to again set a record for hourly peak demand when load averaged 82.03 GW.
Former EIA Administrator Linda Capuano has been appointed to ERCOT's Board of Directors.
ERCOT is setting records for peak demand in what has been described as "hellacious" temperatures, "even by Texas standards."
A comfortable result for MISO's 2023/24 auction does not guarantee sufficient capacity during the coming summer, executives said.
ERCOT says it is prepared for triple-digit temperatures in much of Texas this week and next that are expected to lead to new records for peak demand.
ISO-NE increases 10-year summer and winter peak load predictions, with big gains coming from electrified heating and transportation.
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