WASHINGTON, D.C. – On May 9, 2021, the
Texas Interconnection experienced a widespread reduction of over 1,100 MW of
solar photovoltaic (PV) resources due to a normally cleared fault on the bulk
power system (referred to as the “Odessa Disturbance”). While the ERO has
analyzed multiple similar events in California, this is the first disturbance
involving a widespread reduction of solar PV resources in the Texas
Interconnection. The event involved facilities across a large geographic area
of up to 200 miles from the location of the initiating fault.
NERC and Texas RE
analyzed this event, in coordination with ERCOT, and have documented the key
findings and recommendations in the report. The report
provides details regarding the initiating event, performance of the
bulk power system-connected solar PV fleet during the event, and additional details around
the event. The report also describes modeling and studies improvements needed
to address the root causes of these issues, which is applicable to all
Interconnections. Lastly, the report documents a smaller event involving solar
PV resources that subsequently occurred on June 26.
Odessa Disturbance Report
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