Yes, there's no incentive in the Texas market to build reserve capacity that will seldom be used, because it is all deregulated. The equipment will never pay for itself. The entire concept of the Texas grid (and other deregulated grids) is that the market constituents constantly run the margin, as that's the most profitable, being barely able to meet demand; running on the ragged edge, with just enough capacity to meet demand peaks.
Of course when some of that capacity is offline for maintenance, and you can't depend on fickle wind gen, well, the results are pretty predictable. Nobody operating a grid outside of that type of system ascribes any capacity value to wind gen, because it has none. It's not dispatchable. Capacity is planned based on firm resources and then if wind displaces some of them, well, there you go, you saved some gas or coal. Texas actually plans on there being ~9GW of wind available during the summer, which is totally insane.