Alert, warning and emergency notices

Emergency notices are issued when operating reserves or transmission capacity limitations threaten the ability of the California ISO to safely and reliably operate the grid.

Click here to sign up for Flex Alerts and other ISO communications. Receive notifications of grid emergencies via the ISO Today app or RSS.

Grid history and facts

System Alerts, Warnings and Emergencies Fact Sheet5/08/2018 15:15
California ISO Peak Load History - 1998 through 20173/22/2018 14:35
Grid History - 1998 to Present11/08/2018 08:49

View Impact

Click here for all notices issued over the past 90 days

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