Lone Star Grid The Arctic blast that shut down power to millions of Texas households last week has brought renewed attention to the isolated Texas power grid that prevented the operator from importing out-of-state electricity. February 24, 2021, 10am PST | Irvin Dawid Share There are three power grids in the lower 48 states: the Eastern Interconnection, the Western Interconnection, and the Texas Interconnection. Kate Galbraith, the former energy and environment reporter for The Texas Tribune, penned a go-to piece about the uniqueness of Texas having its own power grid that's as relevant today as it was when she wrote it ten years ago after an Arctic blast shut down 152 generating units, 28% of the generators that supplied electricity to the power grid operated by the Electric Reliability Council of Texas (ERCOT).