Tuesday July 15th ARC Event

Tuesday July 15th ARC Event

Tuesday July 15th 2008 15:50 EST through 16:40 EST the Midwest ISO invoked the ARC procedure due to approximately 1,000 MW loss of generation. Up to 87 percent of the available ARC operating reserves were utilized during this period to assist in correcting the imbalance. There was one ARS event initiated during the event.