The Eastern Interconnection is one of the main power transmission grids in the United States (as well as parts of Canada), covering about 2/3 of the population in North America. It is one of the four major interconnection systems in the North American power system, which are physically connected to other interconnection systems (such as Western Interconnection, ERCOT, Quebec Interconnection) through a small number of direct current (DC) interconnection lines.
