ILCS » Chapter 220 · Act 5
Illinois Compiled Statutes

220 ILCS 5/4-101 (2026)

The Commerce Commission shall have general supervision of all public utilities, except as otherwise provided in this Act, shall inquire into the management of the business thereof and shall keep itself informed as to the manner and method in which the business is conducted

✓ current as of May 2026
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(220 ILCS 5/4-101) (from Ch. 111 2/3, par. 4-101)
    Sec. 4-101. The Commerce Commission shall have general supervision of all public utilities, except as otherwise provided in this Act, shall inquire into the management of the business thereof and shall keep itself informed as to the manner and method in which the business is conducted. It shall examine those public utilities and keep informed as to their general condition, their franchises, capitalization, rates and other charges, and the manner in which their plants, equipment and other property owned, leased, controlled or operated are managed, conducted and operated, not only with respect to the adequacy, security and accommodation afforded by their service but also with respect to their compliance with this Act and any other law, with the orders of the Commission and with the charter and franchise requirements.
    Whenever the Commission is authorized or required by law to consider some aspect of criminal history record information for the purpose of carrying out its statutory powers and responsibilities, then, upon request and payment of fees in conformance with the requirements of Section 2605-400 of the Illinois State Police Law, the Illinois State Police is authorized to furnish, pursuant to positive identification, such information contained in State files as is necessary to fulfill the request.
    The Commission shall require all public utilities to establish a security policy that includes on-site safeguards to restrict physical or electronic access to critical infrastructure and computerized control and data systems. The Commission shall maintain a record of and each regulated entity shall provide to the Commission an annual affidavit signed by a representative of the regulated entity that states:
        (1) that the entity has a security policy in place;
        (2) that the entity has conducted at least one
    
practice exercise based on the security policy within the 12 months immediately preceding the date of the affidavit; and
        (3) with respect to any entity that is an electric
    
public utility, that the entity follows, at a minimum, the most current security standards set forth by the North American Electric Reliability Council.
(Source: P.A. 102-538, eff. 8-20-21.)

    
Notes of Decisions
Cited in 17 cases (4 in the last 5 years), 1994–2026 · leading case: In Re Illinois Bell Switching Station Litig., 641 N.E.2d 440 (Ill. 1994).
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In Re Illinois Bell Switching Station Litig., 641 N.E.2d 440 (Ill. 1994). “) For telecommunications carriers, the proposed tariff must describe "the nature of the service, applicable rates and other charges, [and] terms and conditions of service," among other things.”
Lakehead Pipeline Co. v. Illinois Com. Comm'n, 696 N.E.2d 345 (Ill. App. Ct. 1998). “It does not determine whether the pipeline should enter the market.”
Am. Fed'n of State, Cnty. & Mun. Employees (AFSCME), Council 31 v. Illinois Labor Relations Bd., State Panel, 2014 IL App (1st) 123426 (Ill. App. Ct. 2014). · cites it 2× “Section 4-201 makes it “the duty of the Commission to see that the provisions of the Constitution and statutes of this State affecting public utilities *** are enforced and obeyed.”
Illinois Landowners All., NFP v. Illinois Com. Comm'n, 2016 IL App (3d) 150099 (Ill. App. Ct. 2016). “220 ILCS 5/4-101 (West 2012). Under the Act, a public utility must obtain a certificate of public convenience and necessity from the Commission before transacting any business or constructing a high-voltage transmission line.”
Greenside Props., LLC v. Peoples Gas Light & Coke Co., 2017 IL App (1st) 162821 (Ill. App. Ct. 2017). “" *1062 220 ILCS 5/4-101 (West 2012). "[T]he Commission has the exclusive responsibility to 'see that the provisions of the Constitution and statutes of this State affecting public utilities, the enforcement of which is not specifically vested in some other officer or tribunal,…”
Am. Fed'n of State, Cnty. & Mun. Employees (AFSCME) v. The Illinois Labor Relations Bd., 2014 IL App (1st) 123426 (Ill. App. Ct. 2014). “" 220 ILCS 5/4- 101 (West 2010). Section 4-201 makes it "the duty of the Commission to see that the provisions of the Constitution and statutes of this State affecting public utilities *** are enforced and obeyed.”
GridLiance Heartland LLC v. Illinois Com. Comm'n, 2023 IL App (5th) 230073 (Ill. App. Ct. 2024). “220 ILCS 5/4-101 (West 2022). “Entities that are not public utilities are generally not subject to regulation under the Public Utilities Act or to supervision and control by the Commission.”
Gridliance Heartland LLC v. The Illinois Com. Comm'n, 2023 IL App (5th) 230073-U (Ill. App. Ct. 2023). “220 ILCS 5/4-101 (West 2022). “Entities that are not public utilities are generally not subject to regulation under the Public Utilities Act or to supervision and control by the Commission.”
Vill. of Orland Hills v. Citizens Utils. Co. (Ill. App. Ct. 2004). · cites it 2× “Because the Act expressly empowers the Commission to supervise all public utilities (220 ILCS 5/4-101 (West 2002)) and includes in the definition of a "public utility" any entity which "owns, controls, operates or manages, within this State, *** any plant, equipment or property…”
Sheffler v. Commonwealth Edison Co. (Ill. App. Ct. 2010). · cites it 2× “” 220 ILCS 5/4-101 (West 2006). Further, 15 No.”
Illinois Landowners All., NFP v. Illinois Com. Comm'n, 2016 IL App (3d) 150099 (Ill. App. Ct. 2016). “220 ILCS 5/4-101 (West 2012). Under the Act, a public utility must obtain a certificate of public convenience and necessity from the Commission before transacting any business or constructing a high-voltage transmission line.”
Greenside Props., LLC v. Peoples Gas Light & Coke Co., 2017 IL App (1st) 162821 (Ill. App. Ct. 2018). “” 220 ILCS 5/4-101 (West 2012). “[T]he Commission has the exclusive responsibility to ‘see that the provisions of the Constitution and statutes of this State affecting public utilities, the enforcement of which is not specifically vested in some other officer or tribunal, are…”
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