January 9, 2008 ARC Event

January 9, 2008 ARC Event

Wednesday January 9, 2008 from 06:15 EST through 06:40 EST the Midwest ISO invoked the ARC procedure due to a 1,600 MW Net Schedule Interchange obligation change over a ten minute period created by schedule changes and TLR curtailments. Up to 26 percent of the available ARC operating reserves were utilized during this period to correct the imbalance. There was one ARS event during the procedure.