Texans are cranking on the air conditioning this week amid an unusually early heat wave, setting new records for electricity demand in the state, which surpassed 75 gigawatts on Sunday and smashed the 2019 record. Texas grid operator ERCOT projects it could approach that peak again on Tuesday.

But unlike previous extreme weather events in Texas which led to deadly blackouts, the grid is holding up remarkably well this week. Several experts told CNN that it's owed in large part to strong performances from wind and solar, which generated 27 gigawatts of electricity during Sunday's peak demand -- close to 40% of the total needed.

"Texas is, by rhetoric, anti-renewables. But frankly, renewables are bailing us out," said Michael Webber, an energy expert and professor at the University of Texas at Austin. "They're rocking. That really spares us a lot of heartache and a lot of money."

Despite the Texas Republican rhetoric that wind and solar are unreliable, Texas has a massive and growing fleet of renewables. Zero-carbon electricity sources (wind, solar, and nuclear) powered about 38% of the state's power in 2021, rivaling natural gas at 42%.