September 11, 2008 ARC Event

Thursday September 11, 2008 20:00 EST through 20:30 EST ARC Event

Midwest ISO invoked the ARC procedure due to Net Scheduled Interchange obligation of 500 MW and load coming in higher then projected. Up to 76 percent of the operating reserves were utilized during this period to correct the imbalance. There were no ARS events during the procedure.