Actually not winterizing coal and natural gas plants when warned in 2011 this could happen and choosing not to because it is expensive combined with Texas being on its own state power grid to avoid regulations that would force them to pay for winteriziation is what is killing people.
https://newrepublic.com/article/161386/conservatives-wind-turbines-killing-people-texas-blackouts
Another instance of Texas fossil fuel ghouls not winterizing their shit.
https://www.youtube.com/watch?v=3QKpVnTqngc