Plymouth Substation 4 - Operational 138 kV Substation in Wisconsin, United States

Plymouth Substation 4 is an operational electrical substation located in Wisconsin, United States. Owned and operated by American Transmission Company, it is a key node in the regional high-voltage transmission network, operating at 138 kV, which is a common voltage level for sub-transmission and distribution in the US. The substation falls under the regulatory oversight of the Federal Energy Regulatory Commission (FERC) and must comply with North American Electric Reliability Corporation (NERC) reliability standards. As part of the American Transmission Company's portfolio, it supports grid stability and power delivery across the Midwest. The 138 kV voltage level indicates it serves as a critical link between bulk transmission and local distribution systems. Located in Wisconsin, Plymouth Substation 4 contributes to the reliability of the regional electrical infrastructure, supporting residential, commercial, and industrial loads. Its operational status ensures continued service to the community, and its integration into the broader transmission network helps maintain grid resilience in the face of demand fluctuations and extreme weather events common to the region.

The substation's location in Wisconsin places it within a region characterized by cold winters and variable weather, which can impact grid reliability. The 138 kV voltage level suggests it is a medium-scale facility, likely situated in a rural or suburban area, reducing direct environmental footprint compared to larger transmission assets. Its operation supports the integration of renewable energy sources, such as wind and solar, which are increasingly prevalent in the Midwest.