TX SB2148

Renames "load shedding exercises" to "reliability exercises" in Texas Utilities Code Section 38.077 and requires the Public Utility Commission and ERCOT to conduct simulated or tabletop load shedding exercises with electric generation and transmission/distribution providers at least once during summer and once during winter each year

Defines "critical facility" as transmission substations and associated control centers that could cause widespread grid instability, uncontrolled separation, or cascading outages if damaged by physical attack

Requires new biennial exercises specifically focused on preparing for and mitigating threats of physical attacks on critical facilities, in addition to existing load shedding exercises and NERC Critical Infrastructure Protection standards

Physical attack exercises must identify roles and responsibilities for transmission/distribution providers, electric generation providers, law enforcement, ERCOT, and the commission; providers must submit written attestation confirming coordination with law enforcement

Transmission and distribution providers are not required to disclose specific locations of critical substations for exercise purposes; first physical attack exercise must be completed by December 31, 2026