ILCS » Chapter 220 · Act 5
Illinois Compiled Statutes

220 ILCS 5/10-101 (2026)

The Commission, or any commissioner or administrative law judge designated by the Commission, shall have power to hold investigations, inquiries and hearings concerning any matters covered by the provisions of this Act, or by any other Acts relating to public utilities subject to such rules and regulations as the Commission may establish

✓ current as of May 2026
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(220 ILCS 5/10-101) (from Ch. 111 2/3, par. 10-101)
    Sec. 10-101. The Commission, or any commissioner or administrative law judge designated by the Commission, shall have power to hold investigations, inquiries and hearings concerning any matters covered by the provisions of this Act, or by any other Acts relating to public utilities subject to such rules and regulations as the Commission may establish. In the conduct of any investigation, inquiry or hearing the provisions of the Illinois Administrative Procedure Act, including but not limited to Sections 10-25 and 10-35 of that Act, shall be applicable and the Commission's rules shall be consistent therewith. Complaint cases initiated pursuant to any Section of this Act, investigative proceedings and ratemaking cases shall be considered "contested cases" as defined in Section 1-30 of the Illinois Administrative Procedure Act, any contrary provision therein notwithstanding. Any proceeding intended to lead to the establishment of policies, practices, rules or programs applicable to more than one utility may, in the Commission's discretion, be conducted pursuant to either rulemaking or contested case provisions, provided such choice is clearly indicated at the beginning of such proceeding and subsequently adhered to. No violation of this Section or the Illinois Administrative Procedure Act and no informality in any proceeding or in the manner of taking testimony before the Commission, any commissioner or administrative law judge of the Commission shall invalidate any order, decision, rule or regulation made, approved, or confirmed by the Commission in the absence of prejudice. All hearings conducted by the Commission shall be open to the public.
    Each commissioner and every administrative law judge of the Commission designated by it to hold any inquiry, investigation or hearing, shall have the power to administer oaths and affirmations, certify to all official acts, issue subpoenas, compel the attendance and testimony of witnesses, and the production of papers, books, accounts and documents.
    Hearings shall be held either by the Commission or by one or more commissioners or administrative law judges.
    When any attorney who is not admitted to the practice of law in Illinois by unlimited or conditional admission, but who is licensed in another state, territory, or commonwealth of the United States, the District of Columbia, or a foreign country may desire to appear before the Commission, such attorney shall be allowed to appear before the Commission as provided in Supreme Court Rule 707.
    All evidence presented at hearings held by the Commission or under its authority shall become a part of the records of the Commission. In all cases in which the Commission bases any action on reports of investigation or inquiries not conducted as hearings, such reports shall be made a part of the records of the Commission. All proceedings of the Commission and all documents and records in its possession shall be public records, except as in this Act otherwise provided.
    To the extent consistent with this Section and the Illinois Administrative Procedure Act, the Commission may adopt reasonable and proper rules and regulations relative to the exercise of its powers, and proper rules to govern its proceedings, and regulate the mode and manner of all investigations and hearings, and alter and amend the same.
(Source: P.A. 100-840, eff. 8-13-18.)

    
Notes of Decisions
Cited in 10 cases (2 in the last 5 years), 1998–2021 · leading case: Ameren v. Illinois Com. Comm'n, 2012 IL App (4th) 100962 (Ill. App. Ct. 2012).
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Ameren v. Illinois Com. Comm'n, 2012 IL App (4th) 100962 (Ill. App. Ct. 2012). · cites it 4× “Ameren Illinois’s Argument ¶ 66 Ameren Illinois first argues the Commission’s order violates Illinois law because the Commission improperly changed its rules regarding the application of accumulated depreciation without providing prior notice of the change or instituting a…”
Lifenergy, LLC v. Illinois Com. Comm'n, 2021 IL App (2d) 200411 (Ill. App. Ct. 2021). · cites it 3× “See 220 ILCS 5/10-101 (West 2018) (authorizing the Commission “to hold investigations, inquiries and hearings concerning any matters covered by” the Public Utilities Act (Act) (220 ILCS 5/1-101 et seq.”
Commonwealth Edison Co. v. Munizzo, 2013 IL App (3d) 120153 (Ill. App. Ct. 2013). “The motion further argues that the Public Utilities Act (220 ILCS 5/10-101 et seq. (West 2010)) mandates any action seeking to resolve claims of excess charges by Com Ed be initiated in the Illinois Commerce Commission.”
Securus Tech., Inc. v. Illinois Com. Comm'n, 2014 IL App (1st) 131716 (Ill. App. Ct. 2014). “" 220 ILCS 5/10-101 (West 2012). See also 5 ILCS 100/1-70(ii) (West 2012) (a "rule" does not include "informal advisory rulings issued under Section 5-150" of the Administrative Procedure Act).”
Alhambra-Grantfork Tel. Co. v. Illinois Com. Comm'n (Ill. App. Ct. 2005). · cites it 4× “90(a) (2000)) and section 10-101 of the Illinois Public Utilities Act (Act) (220 ILCS 5/10-101 (West 2002)), which allow out-of-state attorneys to petition to appear pro hac vice in Commission proceedings, encroach on the powers of the judiciary under the Illinois Constitution…”
A. Finkl & Sons Co. v. Illinois Com. Comm'n (Ill. App. Ct. 2001). · cites it 2× “'" 220 ILCS 5/10-101 (West 2000). See also 83 Ill.”
Ameropan Oil Corp. v. Com. Comm'n (Ill. App. Ct. 1998). · cites it 3× “This court has jurisdiction pursuant to the Illinois Public Utilities Act (Act) (220 ILCS 5/10-101 (West 1996)) and Supreme Court Rules 301 and 335 (134 Ill.”
City of Mascoutah v. Illinois Com. Comm'n, 2021 IL App (5th) 200386 (Ill. App. Ct. 2021). “In fact, the City’s petition is excluded from the purview of the Public Utilities Act by the terms of section 10-101 (220 ILCS 5/10-101 (West 2018)), which authorizes the filing of a petition requesting the Commission to “hold investigations, inquiries and hearings concerning…”
Securus Tech., Inc. v. Illinois Com. Comm'n, 2014 IL App (1st) 131716 (Ill. App. Ct. 2014). “" 220 ILCS 5/10-101 (West 2012). See also 5 ILCS 100/1-70(ii) (West 2012) (a "rule" does not include "informal advisory rulings issued under Section 5-150" of the Administrative Procedure Act).”
Securus Tech., Inc. v. Illinois Com. Comm'n, 2014 IL App (1st) 131716 (Ill. App. Ct. 2014). “” 220 ILCS 5/10-101 (West 2012). See also 5 ILCS 100/1-70(ii) (West 2012) (a “rule” does not include “informal advisory rulings issued under Section 5-150” of the Administrative Procedure Act).”
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