TX SB1665

Prohibits the Public Utility Commission of Texas from approving construction of a 765-kilovolt transmission line for the Permian Basin Reliability Plan (Project 55718) until a feasibility study is completed

Requires the study to evaluate extra high voltage transmission line performance under various dispatch scenarios, including different times of day, seasons, and weather conditions

Mandates analysis of estimated costs to ratepayers with particular emphasis on residential customer impacts, as well as factors contributing to potential cost overruns and mitigation strategies

Requires the commission to submit study results to an independent third party for review, excluding any entity that conducted similar studies for ERCOT or market participants after January 1, 2020

The requirement expires September 1, 2029, and takes effect immediately with two-thirds legislative approval or on September 1, 2025