March 10, 2008 ARC Event

March 10, 2008 ARC Event

Monday March 10, 2008 from 06:45 EST through 07:05 EST the Midwest ISO invoked the ARC procedure due to a 700 MW Net Schedule Interchange obligation change over a ten minute period created by schedule changes and load ramped up higher then projected by 500 MW. Up to 84 percent of the available ARC operating reserves were utilized during this period to correct the imbalance. There was one ARS event during the ARC procedure.