Texas has a unique situation electric power-wise. The state is not tied into the national power grid...and it was intentionally designed / set up to be that way (I'm sure they had a reason...but I'm in the dark as to what it might have been). As a result, the state is an 'island unto itself' in that department.
So, in a nutshell, the power demand created by the Arctic weather completely overloaded the state's power grid and there was no way to supplement it with additional power from outside the state. Additionally, it's been reported that neither the grid's 'traditional' power plants (fossil fuel) nor the grid's power-generating 'windmills' were insulated to withstand the current Arctic temps - so they froze up.
Obviously, without electricity nothing moves...so the state's residents are currently living like Eskimos used to live 'back in the day'.
I predict a H-U-G-E run on 'automatic transfer' home generator units in Texas in the very near future.