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The U.S. power system in the Lower 48 states is made up of three main interconnections.
>The Eastern Interconnection encompasses the area east of the Rocky Mountains and a portion of the Texas panhandle.
>The Western Interconnection encompasses the area from the Rockies to the west.
>The Electric Reliability Council of Texas (ERCOT) covers most of Texas.
The data shown is the highest level of interconnections. There are more detailed datasets associated with electricity grids which can be found on NERC’s website.
SOURCE: https://www.eia.gov/energyexplained/electricity/delivery-to-consumers.php