Summary
This report is a comprehensive analysis of the disturbance that occurred in Texas on May 9, 2021, referred to as the Odessa Disturbance. The report outlines the Electric Reliability Organization's (ERO) investigation into the event, which involved a significant reduction in solar photovoltaic (PV) resource power output across a large geographic area. The analysis includes details on the initiating fault, which occurred at a combined-cycle power plant, and the subsequent impact on various generation resources, including solar PV and wind plants. The report documents key findings and recommendations aimed at improving the reliability and security of the bulk power system (BPS). It emphasizes the need for better implementation of NERC reliability guidelines among generator owners and operators, highlighting specific issues such as phase lock loop loss of synchronism and inverter control challenges. The findings are supported by detailed evidence and technical assessments presented throughout the document, including recommendations for future actions to address identified gaps in performance.
