HB 1603 empowers the Public Utility Commission of Texas to establish rules for procuring emergency reserve power generation capacity to address potential blackout conditions in the ERCOT power region. The legislation mandates the development of procedures for estimating reserve power needs and mechanisms for equitable cost distribution related to maintaining and utilizing this capacity. Additionally, the independent organization certified for ERCOT would be required to adopt contracts and procedures ensuring the availability of emergency reserve power, to be used as a last resort after other resources have been exhausted.