Yup the wind turbines can freeze up, and what's worse is they actually REQUIRE power when they're this cold, to keep from damaging them, so not only are they NOT generating, they're actually draining energy from the grid.
Also, solar [panels are covered in snow and not generating.
Also, the natural gas pipelines are freezing up, so lots of that generating capacity is now offline.
Also, we killed off about 5 coal plants nearby, in the past 5 years, and moved a lot of that capacity to wind, solar, and natural gas.
So... well... here we are.