ERCOT calls transmission emergency advisory

The Electric Reliability Council of Texas called a transmission emergency advisory at 1:30 p.m. Monday and effectively ordered a no-touch day due to south-to-north transmission constraints.The transmission system coordinator ordered each control area and, through the control areas, each transmission provider, generation, and load entity to suspend all switching activities and power plant maintenance unless approved by the independent system operator.


The Electric Reliability Council of Texas (ERCOT) called a transmission emergency advisory at 1:30 p.m. Monday and effectively ordered a "no touch" day due to south-to-north transmission constraints.

The transmission system coordinator ordered each control area and, through the control areas, each transmission provider, generation, and load entity to suspend all switching activities and power plant maintenance unless approved by the independent system operator (ISO) until the alert is terminated by the ISO.

Earlier in the day, an ISO representative asked units that were off line to be started to supply entities that were experiencing a generation deficit. ERCOT serves as grid operator for 85% of Texas's electrical load.

This summer ERCOT has called more than 27 transmission alerts to deal with constraints on the system, especially moving power south-to-north.

Transmission constraints have also caused ERCOT to limit unscheduled electric power shipments. In May 2000, 11,974 Mw were curtailed, down from 21,040 Mw in the year earlier period; 8,891 Mw were curtailed in June 2000, up from 5,274 Mw in June 1999; 28,486 Mw were curtailed in July 2000, down from 87,130 Mw last year; and about 52,000 Mw have been curtailed in August 2000, about the same as last year.

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