Who runs ERCOT?

Who exactly is in charge of ERCOT, and what kind of organization is it? Is it a government agency, a private company, or something else entirely? How does ERCOT function and what role does it play in the energy market, particularly in Texas? I'm curious about the governance structure and decision-making processes within ERCOT, and how they impact the reliability and affordability of electricity for consumers in the region.