Of course, their track record is hardly unblemished.
Below is a synopsis of information provided by the WECC Reliability Centers
Expected Non-simultaneous Peaks, Reserves, and Generation Limitations at time of Peak
Area,...........Peak Demand..Projected Reserves.....Req Reserves.....Gen. Outages/Limitations
Northwest SC....46,193........10.4%.....4,814.......3,234... 5,358
RM/DSW RC.......30,539......8.0%.....2,450.....1,798...... 1,452
Calif./MX RC....50,750........7.6%..... 3,869... 3,216.... 6,751
1 Required reserves calculated to be 7% of peak demand.
The difference between Cal ISO/Mexico 7.6% reserves and minimum of 7.0% reserves is a little over 600 MW. One can loose that in the blink of an eye. Also the reserves for the Cal ISO have historically not been where they are needed due to transmission bottlenecks. The "real" West Coast power reserves are up in the PNW (about 1,600 MW's). California and the Rockey Mountain Desert SW rely upon PNW imports for both power and reliability.