September 28th 2008 19:10 EST ARC procedure

Sunday September 28th 2008 19:10 EST through 19:50 EST the Midwest ISO invoked the ARC procedure due to actual load coming in 1,400 MW higher than forecast. Up to 55 percent of the available ARC operating reserves were utilized during this period to assist in correcting the imbalance. There were no ARS events initiated during the event.