From HN comments I've picked up some things, dunno how accurate.
- 1 out of the 2 nuclear plants in Texas also shut down due to issues from the cold; nuclear is not a panacea
- The hit from loss of wind power is dwarfed by the hit from loss of natural gas, which is difficult/impossible to bring to the surface in colder climates
- While Texas's grid is isolated, there's some debate over the actual effect this has had overall, I expect this to become more clear soon since this is what everyone is focusing on right now