https://en.wikipedia.org/wiki/Texas_Interconnection

> The Texas Interconnection is tied to the Eastern Interconnection with a 220 MW DC tie near Oklaunion, and a 600 MW DC tie near Monticello, and is tied to NERC (North American Electric Reliability Corporation) systems in Mexico with a 300 MW DC tie near McAllen, and a 100 MW VFT tie near Laredo.[29] There is one AC tie switch in Dayton, Texas