February 12, 2008 ARC Event

February 12, 2008 ARC Event

Tuesday February 12, 2008 from 03:15 EST through 03:30 EST the Midwest ISO invoked the ARC procedure due to a 2,000 MW Net Schedule Interchange obligation change over a ten minute period created by schedule changes and TLR curtailments. Up to 50 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.