Definition, Major Outage: Consistent with Public Utilities Code Section 364, a major outage occurs when 10 percent of the electric utility's serviceable customers experience a simultaneous, non-momentary interruption of service. For utilities with less than 150,000 customers within California, a major outage occurs when 50 percent of the electric utility's serviceable customers experience a simultaneous, non-momentary interruption of service.
Standard 6. Initial Notification Standard Within one hour of the identification of a major outage or other newsworthy event, the utility shall notify the Commission and Warning Center at the Office of Emergency Services of the location, possible cause and expected duration of the outage. The Warning Center at the OES is expected to notify other state and local agencies of the outage. Subsequent contacts between state and local agencies and the utility shall be conducted between personnel identified in advance, as set forth in Standard 4.B. From time to time the Commission staff may issue instructions or guidelines regarding reporting.
Utilities should refer to the most recent version of Guidelines for Notification of the CPUC Energy Division of Electric Emergencies for instructions regarding reporting of 6 levels of electric service outage emergencies.