From last string:

re: #410 O say, does that Star Spangled Banner yet wave..

The thing is, it might save you a few bucks in the 90% case where it doesn’t freeze. The question is if the damage done by the 10% case outweighs the savings of the 90% case. I’m going to assume that is a hard yes and they are probably finding that out right about now.

The winterization package for windmills is a standard option and, iirc, not particularly expensive. The operators could, and probably did, predict that temperatures in this range would occur at some point during the life of the installation (these temps are not THAT unusual and were commonplace in the mid 20th century). In the ERCOT de-regulated dog-eat-dog world of Texas electric production, operators cannot spend a dime that does not immediately affect the bottom line and regulatory requirements, which this would be, are few and far between. Incidentally, Lubbock is not part of the lepertarian ERCOT system and its windmills are winterized. They have had some blackouts today, but only for a few minutes and primarily because they cannot get power from ERCOT affiliated neighboring grids.