The United States has three power grids:
The Electric Reliability Council of Texas (ERCOT) covers the majority of Texas
The Western Interconnection serves homes and businesses to the west of the Rocky Mountains to the coast
The Eastern Interconnection provides electricity to the east of the Rockies and a part of the Texas panhandle
ERCOT’s grid doesn’t connect with other power networks. When Texas lacks electricity, it cannot import electricity from other power grid