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There are three minor power grids in North America: the Alaska Interconnection, the Texas Interconnection, and the Quebec Interconnection. The Eastern, Western and Texas Interconnections are tied together at various points with DC interconnects allowing electrical power to be transmitted throughout the contiguous U.S., Canada and parts of Mexico.
A wide area synchronous grid (also called an "interconnection" in North America) is a three-phase electric power grid that has regional scale or greater that operates at a synchronized utility frequency and is electrically tied together during normal system conditions.
The Western Interconnection is a wide area synchronous grid and one of the two major alternating current (AC) power grids in the North American power transmission grid.The other major wide area synchronous grid is the Eastern Interconnection.
The Eastern Interconnection is one of the two major alternating-current (AC) electrical grids in the North American power transmission grid. The other major interconnection is the Western Interconnection. The three minor interconnections are the Quebec, Alaska, and Texas interconnections.
ISOs and RTOs of North America as of 2024. A regional transmission organization (RTO) in the United States is an electric power transmission system operator (TSO) that coordinates, controls, and monitors a multi-state electric grid.
A December report from North American Electric Reliability Corporation warned that huge swathes of the country face elevated or high risk of inadequate electric generation capacity.
The fragility and reliability of the electrical grid is a major public policy concern. This 2019 assessment reiterates concerns "that a prolonged collapse of this nation's electrical grid—through starvation, disease, and societal collapse—could result in the death of up to 90% of the American population".
Nobody’s denying that upgrading the 50-year-old power cables the grid is built on is vital; they’re simply not equipped to handle the capacity emerging technologies will require.