WECC JSIS April 2012

System Events

3 March 24, 15:37 – Alberta Separation March 30, 10:20 – 1,600 MW generation loss in WAPA CM, including both Laramie River units March 30, 16:05 – 952 MW generation loss at Grand Coulee April 6, 9:38 – AC RAS event, drop about 1,400 MW of generation April 20, 15:37 – AC RAS event, drop 1,643 MW of generation Summary of WECC Events

Alberta Separation

Frequency Response Summary Dot size is proportional to size of generation drop Blue = nadir, Red = settle