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.