Out of curiosity, what makes you think that the EPA is responsible for Texas having such a high rate of renewable energy? This seems slightly surprising, because there are large portions of the US grid without as many renewables. Could you point me to an article explaining your theory in more detail, with evidence?

One alternate hypothesis might be that renewables are cheap and profitable, with low capital requirements. In a place like Texas, with lots of sun and wind, it might be tempting to build more renewables than the grid could support. Combined with weak regulation, this would risk destabilizing the grid.

In a complex system like an electrical grid, failures can occur for all sorts of complicated reasons. I'd be interested in understanding what happened here, based on evidence.