[jdavis703]

The Texas grid is not integrated with other states. I'm guessing breaking this "independence" is a tough political sell.

[londons_explore]

Power arbitrage between non-connected grids is a thing in the rest of the world. I'd be very surprised if nobody is doing it to/from Texas.

It would require DC/AC convertors, so there is a slight energy loss, and fairly significant upfront capital cost.