"On June 1, Austin Energy issued a notice of suspension and its receipt has been acknowledged, according to the utility’s COO, Charles Dickerson. The energy generation facility will be retired Oct. 31"
Texas energy is traded through ERCOT, an energy market "...governed by a board of directors and subject to oversight by the Public Utility Commission of Texas and the Texas Legislature."
Solar requires energy storage. It is not on demand. Wind and solar must be backed by an on demand source as we don't have sufficiently cost effective storage methods.
Options are then basically hydroelectric, natural gas, petroleum, coal, or nuclear. Nuclear is the cleanest if you can't put a dam somewhere.