Commonwealth Edison

Commonwealth Edison
Name	Commonwealth Edison
Type	Subsidiary
Industry	Electric utility
Founded	1907
Founder	Samuel Insull
Headquarters	Chicago, Illinois
Area served	Northern Illinois
Key people	Joe Dominguez
Products	Electricity
Parent	Exelon Corporation

Commonwealth Edison is a major investor-owned electric utility serving northern Illinois, including the Chicago metropolitan area, with origins dating to the early 20th century. The company grew from the consolidation efforts of Samuel Insull and played a central role in regional electrification, industrial development, and urban expansion. It operates generation, transmission, and distribution assets and has been involved in regulatory, environmental, and safety debates involving state and federal agencies.

History

Founded in 1907 during the consolidation era of the Electric Age, the company expanded under industrialist Samuel Insull and associated firms such as Chicago Edison Company and Public Service Company of Northern Illinois. During the Great Depression and the New Deal era, utilities underwent scrutiny culminating in the Public Utility Holding Company Act of 1935, reshaping ownership and regulatory frameworks for firms like this one. Post‑World War II suburban growth across Cook County, DuPage County, and Lake County, Illinois drove infrastructure expansion, while the deregulation movements of the 1990s and the formation of regional grid entities such as Midcontinent Independent System Operator influenced corporate strategy. In the 21st century, mergers and acquisitions, notably the formation of Exelon Corporation, altered corporate governance and prompted reviews by the Illinois Commerce Commission.

Operations and Service Area

The company serves residential, commercial, and industrial customers across northern Illinois, including the city of Chicago, adjacent suburbs, and parts of Kane County and McHenry County. It maintains a network of substations, distribution feeders, and customer service centers, coordinating with transmission operators like PJM Interconnection and Midcontinent Independent System Operator. Large industrial customers include firms in the manufacturing sector of the Chicago metropolitan area, logistics hubs near O'Hare International Airport, and institutions such as University of Chicago facilities and municipal systems. The utility participates in regional reliability planning with organizations such as the North American Electric Reliability Corporation.

Generation and Transmission

The company historically owned a mix of fossil fuel, nuclear, and peaking generation assets, including coal plants in Crawford Station-era sites and nuclear units developed with partners like ComEd's later partners. Nuclear generation has been supplied through reactors at facilities associated with Exelon Nuclear operations, which involved technology from vendors like Westinghouse Electric Company and General Electric. Transmission infrastructure includes high‑voltage lines linking to regional grids governed by Federal Energy Regulatory Commission policies and coordinated with neighboring utilities such as Ameren Illinois and Commonwealth Edison’s transmission counterparts. Investments in grid modernization have included deployment of smart meters in collaboration with vendors similar to Itron, and integration of distributed resources, including solar arrays and demand response programs.

Regulation and Rates

Rates and service terms are set through proceedings before the Illinois Commerce Commission, shaped by state laws such as the Illinois Public Utilities Act and influenced by federal oversight from the Federal Energy Regulatory Commission. Regulatory cases have addressed cost recovery for infrastructure projects, performance‑based rates, and outcomes of merger approvals related to Exelon Corporation. Rate designs have considered time‑of‑use structures, rider mechanisms for renewable integration, and petitions involving the Utility of the Future concept promoted by state policymakers. Stakeholders in rate proceedings have included consumer advocacy groups like the Citizens Utility Board and business coalitions such as the Illinois Manufacturers' Association.

Environmental and Safety Record

Environmental compliance has involved interactions with the United States Environmental Protection Agency regarding air emissions, mercury rules, and coal ash management at decommissioned sites. The company has undertaken emissions controls at plants to meet standards under regulations such as the Clean Air Act. Safety programs target electrical reliability and worker protection, with oversight from agencies like the Occupational Safety and Health Administration and standards influenced by organizations such as the Institute of Electrical and Electronics Engineers. Renewable energy integration and investments in energy efficiency have been driven by state initiatives including the Illinois Energy Infrastructure Modernization Act and renewable portfolio discussions with advocacy groups like the Sierra Club.

Corporate Structure and Ownership

The utility is a subsidiary of Exelon Corporation, a publicly traded energy holding company formed from mergers among firms including PECO Energy and Unicom (Commonwealth Edison predecessor firms). As part of a holding company structure, corporate governance involves a board of directors, investor relations with entities like S&P Global Ratings and Moody's Investors Service, and transactions reviewed by regulators such as the Illinois Commerce Commission and the Federal Energy Regulatory Commission. Affiliates within the holding company include generation and nuclear operating subsidiaries and competitive retail suppliers subject to state retail choice policy.

Controversies and Incidents

The company has faced controversies and incidents spanning rate disputes, grid outages, environmental compliance, and high‑profile events such as major storm outages and debates over nuclear plant subsidies. Notable incidents have prompted investigations by the Illinois Commerce Commission and federal inquiries with involvement by the Department of Energy in grid resilience discussions. Legal and political challenges have involved consumer advocacy groups, municipal governments like the City of Chicago, and legislative responses in the Illinois General Assembly.

Category:Electric power companies of the United States Category:Companies based in Chicago