Feb. 18, 2021

South Texas Project Unit 1 Returns to ERCOT Grid

Wadsworth, Texas – Feb. 18, 2021 – STP Unit 1 reconnected to the grid yesterday at 2107 and has

returned to its full capacity of approximately 1350MW.

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On Monday, Feb. 15, at 0526, an automatic reactor trip occurred at South Texas Project in Unit 1 causing the unit to come offline. The cause of this unit trip originated from a cold weather induced failure of a feedwater pressure sensing line. STP Operators took immediate action to stabilize the unit and then to focus on promptly returning Unit 1 to the grid. Unit 2 remained online throughout this period and continues to support the Texas ERCOT grid along with Unit 1.

"STP recognizes the hardships our fellow Texans are experiencing due to the combination of cold weather and not having electricity and heat in their homes and businesses," said Jim Connolly, Chief Nuclear Officer for STP Nuclear Operating Company. 

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“We have experienced an unprecedented cold weather event statewide which presented a challenge to our systems. We will conduct a full review of the causes of this loss of generation and apply appropriate preventive and corrective actions to continuously improve the reliability of our units.” said Connolly.

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Oct. 9, 2019

STP Unit 2 completes breaker-to-breaker run, scheduled refueling outage begins

Wadsworth, Texas – October 9, 2019 - On Friday, Oct. 4, STP’s Unit 2 started a scheduled refueling and maintenance outage, marking the completion of its fourth consecutive breaker-to-breaker operational run. STP’s two units combined to safely produce more than 20.7 million megawatt-hours of carbon-free electricity in 2018.