Texas specifically has heavily politicized and demonized wind power, in spite of having massive successes with it prior to 2016 and being a leading producer of it. Solar isn't as bad, but is still seen as "leftist." The political landscape in TX is vastly more friendly to natural gas.
In other words, they are using gas turbines because the politicians are stupid.
In other words, they are using gas turbines because the politicians are stupid.