October 14th 2008 ARC Procedure

Tuesday October 14th 2008 06:15 EST through 06:30 EST the Midwest ISO invoked the ARC procedure due to actual load increasing faster than projected, loss of 1,000 MW of imports due to TLR Curtailments and ~1,200 MW of generation that was not available due to de-rates and not starting on time per plan. Up to 43 percent of the available ARC operating reserves were utilized during this period to assist in correcting the imbalance. There was one ARS event in progress when ARC was implemented and was ongoing during the event.