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2011 Southwest blackout
The 2011 Southwest blackout, sometimes referred to as the Great Blackout of 2011, was a widespread power outage that affected
the San Diego–Tijuana area, southern Orange County, the Imperial Valley, Mexicali Valley, and Coachella Valley, and parts of Arizona. It occurred on Thursday, September 8, 2011, beginning at about 3:38 pm PDT. It was the largest power failure in California history.
==Background==
The electric transmission system owned and controlled by San Diego Gas & Electric (SDG&E, a subsidiary of Sempra Energy) is connected to Arizona by the Southwest Power Link, which is a single 500 kV power line (afterwards, SDG&E built a second line, but this connects in the Imperial Valley and the Arizona section is still a single line). There is no connection at the 500 kV level between SDG&E and either Southern California Edison (SCE) or the Los Angeles Department of Water and Power (LADWP). Rather, they are both connected to the San Onofre Nuclear Generating Station (SONGS). The Imperial Irrigation District (IID) has a 92 kV system connected to both.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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