Overview
ComEd Skokie-Oakton Street 138kV Substation is an operational electrical substation in Skokie, Illinois, owned and operated by Commonwealth Edison. It steps down transmission voltage for local distribution.
ComEd Skokie-Oakton Street 138kV Substation is a key electrical infrastructure asset located in Skokie, Illinois, within the service territory of Commonwealth Edison (ComEd), a major investor-owned utility serving northern Illinois. The substation operates at 138 kilovolts (kV), a common transmission voltage in the United States, and plays a critical role in the regional power grid by transforming high-voltage electricity for distribution to residential, commercial, and industrial customers. As part of ComEd's network, this substation is subject to reliability standards set by the North American Electric Reliability Corporation (NERC) and regulated by the Federal Energy Regulatory Commission (FERC) for transmission-level assets. The 138 kV voltage class is typical for sub-transmission systems that connect bulk power sources to local distribution networks. The substation likely employs modern switchgear and protection systems compliant with IEEE standards, though specific equipment details are not disclosed. The substation's location in Skokie, a suburb north of Chicago, places it in a densely populated urban corridor with high electricity demand. Its operational status ensures grid stability for the surrounding community, supporting essential services and economic activity. The facility contributes to the resilience of the Chicago metropolitan area's electrical infrastructure, which is critical for public safety and commerce.
Environmental context
The substation is situated in an urban environment in Skokie, Illinois, where land use is predominantly residential and commercial. Electrical infrastructure in such settings must manage electromagnetic fields (EMF) and noise within regulatory limits. The 138 kV voltage level requires careful siting to minimize visual impact and ensure safety clearances from buildings and public areas. Stormwater management and vegetation control are typical operational considerations to prevent outages and environmental runoff.
Frequently asked questions
The substation is located in Skokie, Illinois, at approximately latitude 42.0235, longitude -87.7138. It serves the northern Chicago suburbs.
The substation operates at 138 kilovolts (kV), a standard sub-transmission voltage in the United States, used to distribute power from high-voltage transmission lines to local distribution networks.
The substation is owned and operated by Commonwealth Edison (ComEd), the largest electric utility in Illinois, serving over 3.8 million customers.
As part of the U.S. bulk power system, the substation must comply with NERC reliability standards and is subject to FERC jurisdiction for transmission rates and terms. ComEd also follows Illinois Commerce Commission regulations.
A 138 kV substation steps down transmission voltage (typically 138 kV) to lower distribution voltages (e.g., 34.5 kV or 12 kV) for delivery to homes and businesses. It also provides switching and protection capabilities to isolate faults and maintain grid stability.