Overview
ComEd Golf Mill 138kV-345kV Substation is an operational electrical substation in Illinois, United States, owned by Commonwealth Edison. It handles voltages of 345kV, 138kV, and 34.5kV, serving the local grid.
ComEd Golf Mill 138kV-345kV Substation is an operational electrical substation located in Illinois, United States. Owned and operated by Commonwealth Edison (ComEd), a major utility serving northern Illinois, this facility plays a key role in the regional transmission and distribution network. The substation handles multiple voltage levels, including 345kV, 138kV, and 34.5kV, indicating its function as a bulk power delivery point that steps down high-voltage transmission to sub-transmission levels. The substation operates under the regulatory framework of the North American Electric Reliability Corporation (NERC) and the Federal Energy Regulatory Commission (FERC), which enforce reliability standards for the U.S. bulk power system. As part of ComEd's infrastructure, it is subject to NERC's Critical Infrastructure Protection (CIP) standards and FERC's oversight of transmission rates and grid reliability. The facility's voltage levels suggest it is a key node in the PJM Interconnection, the regional transmission organization that manages the grid in the Midwest and Mid-Atlantic. Located in a suburban area near Chicago, the substation supports the electrical needs of residential, commercial, and industrial customers. Its proximity to the Golf Mill shopping center and surrounding communities underscores its role in maintaining grid stability and reliability. The substation's design and equipment, including switchgear and transformers, are typical for high-voltage substations in the region, with modern automation likely implemented per IEC 61850 standards to enhance monitoring and control.
Environmental context
The substation is situated in a suburban environment in Illinois, where the local grid supports a mix of residential, commercial, and light industrial loads. The area experiences a humid continental climate with hot summers and cold winters, which can affect electrical demand and infrastructure performance. The substation's voltage levels and criticality to grid stability are typical for a facility that interconnects transmission and distribution networks, with potential environmental considerations including electromagnetic fields and stormwater runoff from the site.
Frequently asked questions
The substation is located in Illinois, United States, near the Golf Mill shopping center in the Chicago metropolitan area. Its coordinates are approximately 42.056°N, 87.833°W.
The substation handles three voltage levels: 345kV (extra-high voltage transmission), 138kV (high voltage sub-transmission), and 34.5kV (medium voltage distribution). This allows it to step down power from the bulk transmission system to local distribution networks.
The substation is owned and operated by Commonwealth Edison (ComEd), a subsidiary of Exelon Corporation. ComEd is the primary electric utility serving northern Illinois, including the Chicago area.
As part of the U.S. bulk power system, the substation must comply with NERC reliability standards, including CIP for cybersecurity and physical security. It also falls under FERC jurisdiction for transmission rates and grid reliability, and operates within the PJM Interconnection's market and operational rules.
A substation with 138kV and 345kV levels serves as a transmission substation that interconnects high-voltage transmission lines. It transforms voltage between levels, switches circuits, and provides a point for monitoring and controlling power flow. Such substations are critical for grid stability and reliability.