Just got this from Oncor:
Grid situation improving but conservation still needed
Winter record expected Thursday morning; consumers asked to reduce energy consumption 6-9 am
ERCOT’s electricity demand peaked this evening at 56,334 MW between 7-8 pm – a new all-time record for winter peak demand. ERCOT’s previous record for all time winter peak demand is 55,878 MW, which occurred on Jan. 8, 2010.
Although the immediate concerns for the possibility of rotating outages this evening are reduced, ERCOT will still be monitoring the grid closely this evening because additional unexpected major losses of generation could force operators to proceed with emergency procedures to avoid an uncontrolled statewide blackout.
Another record demand expected Thursday morning
At this time, the forecast for tomorrow’s peak load is 56,800 MW which would break the record again. ERCOT is asking consumers to reduce energy consumption during peak-demand times from 6 – 9 am.
The grid continues to have more than 5,000 MW of generation out of service due to the effect of the extreme cold.
Rotating outages are controlled, temporary interruptions of electrical service initiated by each utility when supplies of reserve power are exhausted. Without this safety valve, generators would overload and begin shutting down to avoid damage, risking a domino effect of a state-wide outage.
Utilities/ transmission providers determine the location/scheduling of the rotating outages.