The Federal Communications Commission has posted a summary report on outage reports due to the winter storm impacting Texas and central US.
It looks incomplete to me compared to the detail collected during a typical hurricane. It is based on reports from telecommunication companies. If companies don't self-report, the FCC doesn't know.
Through February 18, 2021
8 Oklahoma outage reports
208 Texas outage reports
Caida and Netblocks data shows more outages in the central United States (Texas), but I don't know how accurate their sub-county measurements are.
According to news reports FEMA brought in 60 generators and diesel fuel into Texas, but local authorities haven't dispatched orders for their deployment yet.