I agree with the PP that said ask your neighbors. I have been chatting mine up, to see what they remember and to see what their plans are...if anyone with a generator is staying, I wanna know!
We left for Rita (living in SE Houston at the time; got a reverse 911 call telling us to leave.) I really thought I'd be coming back to a bare slab, but we didn't have any damage.
FWIW, one of my neighbors said Bear Branch subdivision in KW was without power for a week, but another neighboring subdivision was only without for 3 days.
There's no guarantee of anything, even that Dallas will have power continuously for the next several days. In '96 a minor glitch in Muleshoe, TX took out like 3 states' worth of the grid for 7 hours on a gorgeous sunny day...hopefully they've improved the redundancies since then!
So, watching and waiting....Go Away Ike!