California's power grid operators have fired an employee and disciplined two others for mistakes that caused a widespread blackout in San Diego County this month.
The 45-minute blackout on April 1 affected 300,000 homes from the Mexican border to Orange County.
The California Independent System Operator says workers mistakenly permitted the routine shutdown of a 600-megawatt power plant and then permitted a blackout rather than allowing the county to import more electricity.
Cal-ISO spokesman Gregg Fishman says Thursday that a worker was dismissed and two others disciplined. Cal-ISO also is giving grid operators more intensive training.
