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Transmission lines 765, 500, 345, 230, and 138 kV
Transmission Customer138kV or 230kV
Generating Station
GeneratingStep UpTransformer
SubstationStep DownTransformer
Color Key:Black: Generation
Green: Distribution
Blue: Transmission
SubtransmissionCustomer26kV and 69kV
Primary Customer13kV and 4kV
Secondary Customer120V and 240V