February 11, 2008 ARC Event

February 11, 2008 ARC Event

Monday February 11, 2008 from 23:25 EST through 23:55 EST the Midwest ISO invoked the ARC procedure due to 1,000 MW Net Schedule Interchange obligation change over a ten minute period created by schedule changes and 300 MW of generation forced off line. Up to 56 percent of the available ARC operating reserves were utilized during this period to correct the imbalance. There were no ARS events initiated during the event.