February 14, 2008 ARC Event

February 14, 2008 ARC Event

Thursday February 14, 2008 from 00:20 EST through 00:35 EST the Midwest ISO invoked the ARC procedure due to a 1,000 MW Net Schedule Interchange obligation change over a ten minute period created by schedule changes and 250 MW of generation forced off line. Up to 65 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.