Federal Regulators To Investigate San Diego Power Outage
U.S. energy regulators said Friday they are investigating the cause of a massive power outage in the San Diego area and parts of Arizona and Mexico that left more than 1 million people in the dark and caused a nuclear power plant to shut down.
The Federal Energy Regulatory Commission said it is working to determine the causes of the outages, which started Thursday afternoon, and was coordinating with the Department of Energy, the North American Electric Reliability Corp., California and Arizona regulators, and other groups.
About 1.4 million utility customers in San Diego County, 56,000 customers in Arizona and a few hundred customers in Orange, Riverside and Imperial Counties in California and in parts of the Mexican state of Baja California, lost power after a transmission line transporting electricity from Arizona power plants to California failed, causing a large southern California nuclear power plant to shut down.
Power to all 1.4 million customers of Sempra Energy's (SRE) San Diego Gas & Electric utility was restored by early Friday morning, the utility said.
On Thursday, the loss of electricity from the transmission line forced an automatic shutdown of the San Onofre nuclear-power plant in San Clemente, Calif., which is operated by Edison International's (EIX) Southern California Edison utility, spokesman Paul Klein said. SoCal Edison didn't say when it would restart the plant. The plant's two units had enough grid electricity to operate the facility's safety systems, Klein said.
The power outage started at a substation near Yuma, Ariz., owned by Arizona Public Service Co., when a utility repair job caused a problem that caused the substation to automatically shut down, according to the utility. The substation outage spread to the transmission line, causing the downstream outages in California and Mexico, according to California's grid operator and utilities that were affected by the outage.
The substation outage near Yuma should have been isolated and shouldn't have spread to the transmission line, said Damon Gross, a spokesman with APS, which is a unit of Pinnacle West Capital Corp. (PNW). He added that the utility is investigating what went wrong at the substation and why the outage spread.
About 56,000 APS customers in Yuma lost electricity Thursday; all had been restored by Friday, according to the utility.
About 115 SoCal Edison customers lost electricity Thursday, according to the utility.
U.S. energy regulators said Friday they are investigating the cause of a massive power outage in the San Diego area and parts of Arizona and Mexico that left more than 1 million people in the dark and caused a nuclear power plant to shut down.
The Federal Energy Regulatory Commission said it is working to determine the causes of the outages, which started Thursday afternoon, and was coordinating with the Department of Energy, the North American Electric Reliability Corp., California and Arizona regulators, and other groups.
About 1.4 million utility customers in San Diego County, 56,000 customers in Arizona and a few hundred customers in Orange, Riverside and Imperial Counties in California and in parts of the Mexican state of Baja California, lost power after a transmission line transporting electricity from Arizona power plants to California failed, causing a large southern California nuclear power plant to shut down.
Power to all 1.4 million customers of Sempra Energy's (SRE) San Diego Gas & Electric utility was restored by early Friday morning, the utility said.
On Thursday, the loss of electricity from the transmission line forced an automatic shutdown of the San Onofre nuclear-power plant in San Clemente, Calif., which is operated by Edison International's (EIX) Southern California Edison utility, spokesman Paul Klein said. SoCal Edison didn't say when it would restart the plant. The plant's two units had enough grid electricity to operate the facility's safety systems, Klein said.
The power outage started at a substation near Yuma, Ariz., owned by Arizona Public Service Co., when a utility repair job caused a problem that caused the substation to automatically shut down, according to the utility. The substation outage spread to the transmission line, causing the downstream outages in California and Mexico, according to California's grid operator and utilities that were affected by the outage.
The substation outage near Yuma should have been isolated and shouldn't have spread to the transmission line, said Damon Gross, a spokesman with APS, which is a unit of Pinnacle West Capital Corp. (PNW). He added that the utility is investigating what went wrong at the substation and why the outage spread.
About 56,000 APS customers in Yuma lost electricity Thursday; all had been restored by Friday, according to the utility.
About 115 SoCal Edison customers lost electricity Thursday, according to the utility.
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