There is no single grid operator, and they neither own nor operate any transmission lines. ERCOT’s purpose is to coordinate supply and demand on the grid, and to try to ensure electricity demand does not exceed supply using what limited tools they have available to them. They can’t build new power plants and they can’t build new power lines, all they can do is request more power from generators and request or force consumers to decrease demand
The Public Utility Commission, governor, and the state legislature are where you need to direct your anger