urgent notice market participants due to the unusual events occurring on the east coast , the caiso is anticipating the possibility of having some difficulty facilitating today ' s hour ahead markets and tomorrow ' s day ahead market . the caiso is not suspending either market at this time , however the possibility for the suspension for one or more markets exists . the caiso will continue to facilitate the hour ahead market as long as balanced schedules are submitted . a decision to suspend the day ahead market for operating day 09 - 12 - 01 will be made by 1200 pst today . please contact the caiso hour ahead operator ( 916 - 351 - 4409 ) upon receipt of this message .