In the 1976 'Midnight Connection,' a Texas utility deliberately linked its grid to Oklahoma to force federal jurisdiction, and regulators ordered the link cut within a year

The intrastate isolation that keeps the Texas grid outside federal regulation has not simply persisted by inertia; it was actively defended when challenged from inside. Per KUT/NPR, "On May 4, 1976, a power company based in Texas sent electricity from a substation in Vernon, Texas, to Altus, Okla." — a deliberate cross-state interconnection later nicknamed the "Midnight Connection." The company named is Central and South West Corp, which owned utilities on both the Texas and Oklahoma sides of the line and stood to gain competitively if the Texas market were pulled under federal jurisdiction.

Crossing state lines with power was precisely the act that triggered federal oversight under the 1935 Public Utility Holding Company Act, so the connection was an attempt to invoke that jurisdiction rather than avoid it. The countermeasure followed quickly: "A year after the electric connection between Texas and Oklahoma had been made, the PUC ordered it to be cut off." The isolation held.

The episode is the historical proof that Texas grid independence is a maintained legal boundary, not a passive engineering fact — a boundary that has been breached, contested, and re-sealed by regulators at least once. That same fault line is now under a different kind of pressure from the AI data-center boom driving ERCOT's large-load interconnection queue, where the stress comes from demand concentrating inside the island rather than from a utility trying to break out of it.