The Texas power grid operator forecast demand would reach a record high on Aug. 24 as homes and businesses crank up their air conditioners to escape another heatwave.
The grid, however, also forecast power use would reach that level on Aug. 23, only to pull back that outlook as cooler weather reduced the peaks.
The United States has been beset by extreme weather this year, including a freeze in Texas that knocked out power to millions in February and record heat in the Pacific Northwest this summer.
Temperatures in Houston, the biggest city in Texas by population, will reach the upper 90s Fahrenheit (35 Celsius) every day from Aug. 22-25, according to AccuWeather. That compares with a normal high in the city of 94 F (34 C) at this time of year.
The Electric Reliability Council of Texas (ERCOT), which operates most of the state's grid, projected power use would reach 75,104 megawatts (MW) on Aug. 24, which would top the grid's all-time high of 74,820 MW set in August 2019.
One megawatt can power around 200 homes on a hot summer day.
So far on Aug. 24, ERCOT said the grid was operating normally with enough supply to meet current demand.
Extreme weather reminds Texans of the February freeze that left millions without power, water and heat for days during a deadly storm as ERCOT scrambled to prevent a grid collapse after an unusually large amount of generation was shut.
Despite the heat, on-peak power at the ERCOT North hub, which includes Dallas, traded at just $52 per megawatt hour (MWh) for Aug. 24.
That is well below the $187/MWh average seen so far in 2021 due primarily to price spikes over $8,000 during the February freeze, and compares with 2020's $26 average and a five-year (2016-2020) average of $33.
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