It's not a "Once in a Century Storm". A similar (though not quite as intense) storm occurred 10 years ago. Then, as now, Texas had to implement a rolling blackout. The downtime was less, there weren't so many water systems destroyed due to frozen pipes, and fewer then a million ever went without power at a time, and they were simple 45 minute rotations.
The primary difference between 10 years ago and today is 10 years ago, "renewable" energy that failed accounted for 8% of the energy grid. Today it accounts for 25% of the energy grid.
Regardless, the energy grid will be back up and running at regular levels soon. The larger issue is the crops that hard froze, and water systems that froze and burst. Texas REALLY was not prepared for this level of hard freeze. Top in all the other states that've been impacted, and the massive damage to crops, loss of power to hothouses causing loss of even those crops, and all the waste due to supply line issues from the 2020 lockdowns, and we're looking at a real food problem. Russia has already raised the prices on wheat, France has raised the prices on soy and corn, and Australia is following suit.
The US's role in keeping global food prices cheap for the masses has just suffered a serious hit. I don't care about this "global warming" argument at all, really. It ignores completely the lives that're not only going to be severely impacted, but the lives that're going to be ended, AND the hit to an already buckling global economy that's still under partial lockdown over covid.