Severe weather this summer could cause another Texas power crisis

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Electricity outages in Texas could occur again this summer — just a few months after the devastating winter storm that left millions of Texans without power for days — if the state experiences a severe heatwave or drought combined with high demand for power, according to recent assessments by the state’s grid operator.

Experts and company executives are warning that the power grid that covers most of the state is at risk of another crisis this summer when demand for electricity typically peaks as homes and businesses crank up air conditioning to ride out the Texas heat. Texas is likely to see a hotter and drier summer than normal this year, according to an April climate outlook from the National Oceanic and Atmospheric Administration, and 2021 is very likely to rank among the 10 warmest years on record globally.

“This summer, I am as worried right now [about the grid] as I was coming into this winter,” said Curt Morgan, CEO of Vistra Corp., an Irving-based power company. “Sounds like I’m the boy that cries wolf, but I’m not. I’ve seen this stuff repeat itself. We can have the same event happen if we don’t fix this.”

As state lawmakers continue debating how to improve the grid after February’s storm nearly caused its collapse, on Tuesday Texans were asked to conserve electricity because the supply of power could barely keep up with demand. A significant chunk of the grid’s power plants was offline due to maintenance this week, some a result of damage from the winter storm.

The warning triggered a torrent of outrage from residents and political leaders across the state who questioned why the Electric Reliability Council of Texas, which manages the grid, allowed it to come so close to emergency conditions on a relatively mild spring day. “I appreciate the increased effort toward transparency, but wow this is nervewracking to see in April,” state Rep. Erin Zwiener, D-Driftwood, tweeted Tuesday.

Heading into the summer, ERCOT included three extreme scenarios in a preliminary assessment of the state’s power resources for the summer — the most extreme calculations ERCOT has ever considered for the seasonal assessment. Each scenario would leave the grid short a significant amount of power, which would trigger outages to residents:

  • In the first scenario, a drought similar to what the state saw in 2011, combined with low winds, several natural gas plants offline and an increase in economic activity as the pandemic eases, would leave the power grid short 3,600 megawatts, or enough to power 720,000 homes.
  • Add low solar power generation to the first projection (say it’s a cloudy day), and the grid would be short 7,500 megawatts, or enough to power 1.5 million homes.
  • In the most extreme scenario, ERCOT considered, a severe heatwave across the entire state combined with outages for every major power source would leave the grid short 14,000 megawatts, or enough to power 2.8 million homes.

Power grids must keep supply and demand in balance at all times. When Texas’ grid falls below its safety margin of 2,300 megawatts in excess supply, the grid operator starts taking additional precautions, like what happened on Tuesday, to avoid blackouts.