Earlier quoted context omitted.
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Maybe you got a bit lucky. https://en.wikipedia.org/wiki/2021_Texas_power_crisis#Backgr... > In 2011, Texas was hit by the Groundhog Day blizzard between February 1 and 5, resulting in rolling blackouts across more than 75% of the state… Following this disaster, the North American Electric Reliability Corporation made several recommendations for upgrading Texas's electrical infrastructure to prevent a similar event o…
The report your wikipedia article cites for 75% says this: "In the case of ERCOT, where rolling blackouts affected the largest number of customers (3.2 million), there were 3100 MW of responsive reserves available on the first day of the event, compared to a minimum requirement of 2300 MW." So an eighth or so of Texas' ~25 million population in 2011.