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Ameren Illinois Co

CIK: 186541 Annual ReportLatest: 2026-02-18

10-K / February 18, 2026

Company

Overview

The company operates as a utility involved in electric power and natural gas distribution, with activities across generation, transmission, and regulated services. It emphasizes renewable energy and zero-emission standards and runs customer energy-efficiency programs. The report addresses human capital management and industry issues, and it includes mine safety disclosures, reflecting involvement with mining assets or coal-related operations. The filing also covers governance, cybersecurity, legal proceedings, and executive leadership.

Core business areas and functions

  • Rates and Regulation
    • Interactions with regulatory bodies, including rate setting, tariff approvals, and other regulatory actions.
  • Transmission
    • Ownership and operation of high-voltage transmission networks for moving electricity from generation sources to distribution systems and customers.
  • Supply of Electric Power
    • Procurement, dispatch, and sale of electric power across wholesale and/or retail activities.
  • Power Generation
    • Ownership and operation of generation facilities (coal, gas, nuclear, hydro, etc.) to produce electricity.
  • Renewable Energy and Zero Emission Standards
    • Investments in renewable assets (solar, wind, etc.) and compliance with standards aimed at reducing emissions.
  • Customer Energy-Efficiency Programs
    • Programs that help customers reduce consumption and improve efficiency.
  • Natural Gas Supply for Distribution
    • Procurement, storage, and distribution of natural gas to end customers as part of gas utility operations.
  • Human Capital Management
    • Workforce management, including hiring, training, benefits, diversity, and related initiatives.
  • Industry Issues
    • External factors affecting the business, such as regulatory, market, technological, and environmental developments.
  • Operating Statistics
    • Performance indicators and operational metrics referenced in the full report.
  • Available Information
    • References to supplemental filings, exhibits, and other sources where additional details are provided.

Governance, risk, and disclosures

  • Item 1A. Risk Factors
    • Material risks facing the business.
  • Item 1B. Unresolved Staff Comments
  • Item 1C. Cybersecurity
    • Disclosures related to cybersecurity risk and controls.
  • Item 2. Properties
    • Description of properties owned or leased.
  • Item 3. Legal Proceedings
    • Ongoing legal matters.
  • Item 4. Mine Safety Disclosures
    • MSHA-related disclosures tied to coal mining activities or coal-related assets.
  • Information about Our Executive Officers
    • Details on executive leadership.