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Southern California Edison (SCE) energized the Rancho Vista gas insulated substation (GIS) on May 29, 2009. The substation uses a breaker-and-a-half scheme rated 63 kA at 550 kV and 80 kA at 245kV. The main buses at each voltage are rated 7,500 A continuous. The 500/230 kV substation was built to satisfy rapid load growth and increased reliability requirements for the northeastern Los Angeles Basin.