The Eastern Interconnection encompasses the area east of the Rocky Mountains and a portion of northern Texas.At the highest level, the United States power system in the Lower 48 states is made up of three main interconnections, which operate largely independently from each other with limited transfers of power between them. Local electricity grids are interconnected to form larger networks for reliability and commercial purposes. In the United States, the power system consists of more than 7,300 power plants, nearly 160,000 miles of high-voltage power lines, and millions of low-voltage power lines and distribution transformers, which connect 145 million customers. The sizes of the circles are roughly indicative of electric system size.Įlectricity generated at power plants moves through a complex network of electricity substations, power lines, and distribution transformers before it reaches customers. Energy Information Administration Note: The locations of the electric systems are illustrative and are not geographically accurate.
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