December 05, 2007 ARC Event

December 05, 2007 ARC Event

Wednesday December 05, 2007 from 17:50 EST through 18:30 EST the Midwest ISO invoked the ARC procedure due to a loss of 920 MW of generation. Up to 88% of the operating reserves were utilized during the procedure during this period to correct the imbalance. There was one ARS event during this procedure.