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Texas is unique in another way. It's electrical system is not interconnected with the rest of the nation. https://www.nerc.com/AboutNERC/keyplayers/Documents/NERC_Reg...

There are still DC Ties connecting to the Western Interconnect and the Eastern Interconnect.

ERCOT (which manages the grid in most, but not all, of Texas) has 5 DC ties to other grids. Two are to the Eastern Interconnect and 3 are to Mexico.

El Paso isn't in ERCOT, but is connected to the Western Interconnection