"But the state’s policies discouraged the development of energy storage projects that could smooth imbalances in supply and demand as more intermittent wind and solar sources join the grid; the deregulated market has made it challenging for battery projects, which are the most responsive and flexible to install."

You don't need fossil fuel plants sitting idle. You need to increase energy storage capacity which according to the article state policy makes difficult to pursue. So yeah Texas is just propping up fossil fuel profits at the expense of renewables with its plan.