Relating to the authority of the Public Utility Commission of Texas to ensure the independent organization certified for the ERCOT power region has adequate reserve power to prevent blackout conditions.

HB 1603 requires the Public Utility Commission of Texas (PUC) to establish rules ensuring ERCOT - the independent grid operator for Texas - maintains sufficient emergency reserve power capacity to prevent blackouts during power shortages. The bill mandates PUC rules to estimate necessary reserve levels and create fair cost-sharing mechanisms for both securing the reserve capacity and using it during emergencies. ERCOT must adopt procedures to guarantee this reserve is available but can only activate it after exhausting all other power sources and demand reductions, as specified in PUC rules. The law aims to strengthen grid reliability by formalizing emergency power safeguards for Texas' electricity system.