AEENYSEElectric & Other Services CombinedUS GAAP · USD

Ameren Corporation

Ameren Corporation is a St. Louis, Missouri-based public utility holding company whose operations are conducted through regulated utility subsidiaries. Its core businesses are electric generation, transmission and distribution, and natural gas distribution, primarily through Ameren Missouri and Ameren Illinois. Ameren also owns FERC-regulated electric transmission assets through ATXI and the Ameren Transmission segment within the MISO footprint. Cash flows to the parent company depend on dividends and other distributions from these regulated subsidiaries, making regulatory outcomes and allowed returns central to the business model.

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Revenue8,799m USD
+15.4 %y/y
Operating profit (EBIT)2,026m USD
+33.6 %y/y
EBIT margin23.0%
+3.1 ppy/y
Net income1,461m USD
+23.1 %y/y
Free cash flow-775m USD
+50.2 %y/y

Fiscal year 2025 · change from previous year

Development 2020–2025

02,0004,0006,0008,00010,000m USD2020: 5,794 m USD2020: EBIT 1,300 m USD20202021: 6,394 m USD2021: EBIT 1,333 m USD20212022: 7,957 m USD2022: EBIT 1,515 m USD20222023: 7,500 m USD2023: EBIT 1,558 m USD20232024: 7,623 m USD2024: EBIT 1,516 m USD20242025: 8,799 m USD2025: EBIT 2,026 m USD20258,7992,026
RevenueOperating profit (EBIT)
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Business

Share of revenue
Ameren Missouri55 %

Rate-regulated electric generation, transmission and distribution plus natural gas distribution in Missouri.

Ameren Illinois Electric Distribution20 %

Rate-regulated electric distribution in Illinois, including pass-through power supply and transmission charges for customers.

Ameren Illinois Natural Gas10 %

Rate-regulated natural gas distribution service for Illinois customers.

Ameren Transmission15 %

FERC-regulated electric transmission operations and investments within MISO (including ATXI and Illinois transmission).

Products

Reported · share of revenue
87.1%12.9%FY2025100 %
  • Electricity87.1 %
  • Natural Gas Reserves12.9 %

Source: 10-K FY2025, revenue the company reports per product line (SEC XBRL). Shares are of the lines shown and add up to 100 %.

Customers

Ameren’s customers are primarily retail electric and natural gas end-users located within its regulated service territories in Missouri and Illinois. In Illinois, customers can choose alternative retail electric suppliers, but Ameren Illinois remains the provider of last resort for electric supply for customers who do not switch. For those default-supply customers, Ameren Illinois procures power through processes administered by the Illinois Power Agency (IPA) and through MISO markets, with purchased power and related procurement costs passed through to customers and largely offset by corresponding revenues. Ameren also serves wholesale transmission customers through FERC-regulated transmission service in MISO, where revenues are driven by transmission rates and approved investment in grid infrastructure.

Residential and small commercial (MO & IL)

Buy regulated electric and/or natural gas delivery; demand is weather- and usage-driven with regulated tariffs.

Large commercial and industrial (MO & IL)

Purchase higher-volume electric and gas service and value reliability, capacity and predictable regulated pricing structures.

Illinois default-supply (provider of last resort) customers

Receive energy supply procured by Ameren Illinois via IPA/MISO when they do not choose an alternative supplier; costs are largely pass-through.

Transmission customers (MISO/FERC)

Pay for regional transmission service and benefit from grid expansion and reliability investments recovered through FERC-approved rates.

Strategy

Ameren’s strategy centers on investing in rate-regulated energy infrastructure, where returns are set through state commissions and FERC and capital spending is intended to be recoverable from customers subject to prudence reviews. The company emphasizes enhancing regulatory frameworks and advocating for policies that support infrastructure investment and customer outcomes, reflecting the importance of constructive regulation to earnings and cash flow. Ameren also targets operating performance optimization through disciplined cost management and capital allocation to support reliability and modernization. The plan includes significant multi-year capital expenditures across Ameren Missouri, Ameren Illinois and ATXI, which increases the importance of timely approvals, execution and cost control.

Rate-regulated infrastructure investmentLong term

Expands regulated asset base and supports reliability and modernization with recovery through rates subject to review.

Regulatory framework enhancement and policy advocacyMedium term

Allowed returns, riders/trackers and timely rate relief drive earnings stability and cash flow at a regulated utility.

Operating performance and cost disciplineShort term

Controls O&M and execution risk during elevated capital spending and helps manage customer affordability and regulatory outcomes.

Geography

Ameren’s operations are concentrated in the United States, with regulated utility service territories in Missouri and Illinois and transmission assets operated within the MISO region. The company is headquartered in St. Louis, Missouri, and its operating subsidiaries are organized around state regulatory jurisdictions (Missouri and Illinois) and federal transmission regulation (FERC). This geographic concentration increases exposure to state policy and rate-setting outcomes, as well as regional weather patterns that influence retail sales volumes and storm restoration costs. No authoritative revenue-by-geography percentages were provided in the excerpts, so geographic revenue shares are not presented here.

Risks

Ameren’s earnings and cash flows are highly sensitive to regulatory decisions in Missouri and Illinois and to FERC outcomes for transmission, including allowed returns, cost recovery mechanisms and the timing of rate relief (regulatory lag). The company is executing a large capital program, which creates construction, permitting, supply chain and cost overrun risks, and exposes projects to prudence reviews that can disallow recovery. Operationally, weather variability affects retail sales volumes and storm restoration costs, and the company faces environmental compliance and litigation exposure tied to generation assets (including matters referenced for the Rush Island Energy Center). In Illinois, statutory and compliance requirements (including CEJA ethics and compliance provisions) can create investigation, refund and penalty risk if violations are found.

Sorted by severity
LowMediumHighLowMediumHighImpact →Likelihood →Extensive regulation and dependence on rate recovery1Capital program execution and prudence review risk2Environmental litigation and compliance costs3Illinois CEJA ethics/compliance enforcement risk4
Impact is the risk’s severity and likelihood how probable it is over the next few years, both assessed from the company’s reports. Numbers match the list.
  1. Extensive regulation and dependence on rate recoveryImpact: HighLikelihood: Medium

    Utility earnings depend on state/FERC-approved rates, riders and timely approvals; adverse outcomes reduce returns or delay recovery.

    ExposureMissouri PSCIllinois ICCFERC (transmission)
  2. Capital program execution and prudence review riskImpact: HighLikelihood: Medium

    Large planned investments can face cost overruns, delays and post-spend prudence reviews that may limit customer recovery.

    Exposure2026-2030 capex plan across Ameren MissouriAmeren IllinoisATXI
  3. Environmental litigation and compliance costsImpact: MediumLikelihood: Medium

    Generation-related environmental matters can lead to claims, remediation obligations and operational constraints.

    Exposure: Referenced NSR and Clean Air Act litigation associated with Rush Island Energy Center

  4. Illinois CEJA ethics/compliance enforcement riskImpact: MediumLikelihood: Low

    ICC may investigate use of customer funds and require refunds and impose penalties up to $0.5 million per violation if violations occur.

    Exposure: Ameren Illinois utilities subject to CEJA provisions

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Accounting

Judgemental items
Accounting for Asset Retirement Obligations (AROs)

ARO liabilities and related expense depend on discount rates, cost escalation and changes in regulation/scope/timing of remediation.

Impact: Can materially change recorded liabilities and periodic accretion/depreciation-related impacts.

Income taxes (deferred taxes, valuation allowances, uncertain tax positions)

Requires estimates of future taxable income, tax law and regulatory treatment; recognition thresholds for tax benefits are judgmental.

Impact: Affects effective tax rate, deferred tax balances and potential adjustments from audits or law changes.

Regulatory trackers and treatment of tax credit transfers

Expected transfers of production/investment tax credits and inclusion in trackers/RESRAM influence timing of customer refunds and regulatory balances.

Impact: Impacts operating cash flows and regulatory liabilities/deferrals rather than long-run earnings.

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Last updated: 24/09/2026