INTERCONNECTION (TO THE GRID)

North America consists of two major and three minor alternating current (AC) power grids, known as “interconnections.” 

The Eastern Interconnection spans from Central Canada to the Atlantic coast (excluding Québec), down to Florida, and westward to the Rockies (excluding most of Texas). In normal conditions, all electric utilities in the Eastern Interconnection are interconnected and operate at a synchronized frequency of around 60Hz.

The Western Interconnection extends from Western Canada to the state of Baja California in Mexico, reaching eastward over the Rockies to the Great Plains. Similarly, all electric utilities in the Western Interconnection are interconnected and operate at a synchronized frequency of around 60Hz.