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Supplemental Information | 3 Months Ended
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Mar. 31, 2025
Supplemental Information [Abstract] |
Supplemental Information | SUPPLEMENTAL INFORMATION Cash, Cash Equivalents, and Restricted Cash The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets and the statements of cash flows at March 31, 2025, and December 31, 2024:
| March 31, 2025 |  |  | December 31, 2024
Ameren |  | Ameren Missouri |  | Ameren Illinois |  |  | Ameren |  | Ameren Missouri |  | Ameren Illinois
“Cash and cash equivalents” | $ | 23 |  |  | $ | 7 |  |  | $ | 4 |  |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |
Restricted cash included in “Other current assets” | 40 |  |  | 32 |  |  | 5 |  |  |  | 15 |  |  | 7 |  |  | 6 |
Restricted cash included in “Other assets” | 307 |  |  | — |  |  | 307 |  |  |  | 296 |  |  | — |  |  | 296 |
Restricted cash included in “Nuclear decommissioning trust fund” | 6 |  |  | 6 |  |  | — |  |  |  | 10 |  |  | 10 |  |  | — |
Total cash, cash equivalents, and restricted cash | $ | 376 |  |  | $ | 45 |  |  | $ | 316 |  |  |  | $ | 328 |  |  | $ | 17 |  |  | $ | 302 |
Restricted cash included in “Other current assets” represents funds held by an irrevocable Voluntary Employee Beneficiary Association (VEBA) trust, which provides health care benefits for active employees on Ameren’s, Ameren Missouri’s, and Ameren Illinois’ balance sheets, funds held in an escrow account for programs established as a result of a 2024 court order resolving outstanding claims in the NSR and Clean Air Act litigation on Ameren’s and Ameren Missouri’s balance sheets, and AMF’s restricted cash for payments for securitized utility tariff bonds on Ameren’s and Ameren Missouri’s balance sheets. Restricted cash included in “Other assets” on Ameren’s and Ameren Illinois’ balance sheets primarily represents amounts collected under a cost recovery rider restricted for use in the procurement of renewable energy credits and amounts in a trust fund restricted for the use of funding certain asbestos-related claims. Accounts Receivable “Accounts receivable – trade” on Ameren’s and Ameren Illinois’ balance sheets include certain receivables purchased at a discount from alternative retail electric suppliers that elect to participate in the utility consolidated billing program. At March 31, 2025, and December 31, 2024, “Other current liabilities” on Ameren’s and Ameren Illinois’ balance sheets included payables for purchased receivables of $47 million and $43 million, respectively. The following table provides a reconciliation of the beginning and ending amount of the allowance for doubtful accounts for the three months ended March 31, 2025 and 2024:
|  |  | Three Months
|  |  |  |  |  | 2025 |  | 2024 |
Ameren: |  |  |  |  |  |  |  |  |
Beginning of period |  |  |  |  |  | $ | 30 |  |  | $ | 30 |  |
Bad debt expense |  |  |  |  |  | 16 |  |  | 10 |  |
Charged to other accounts(a) |  |  |  |  |  | 1 |  |  | 3 |  |
Net write-offs |  |  |  |  |  | (6) |  |  | (6) |  |
End of period |  |  |  |  |  | $ | 41 |  |  | $ | 37 |  |
Ameren Missouri: |  |  |  |  |  |  |  |  |
Beginning of period |  |  |  |  |  | $ | 12 |  |  | $ | 12 |  |
Bad debt expense |  |  |  |  |  | 2 |  |  | 1 |  |
Net write-offs |  |  |  |  |  | (2) |  |  | (2) |  |
End of period |  |  |  |  |  | $ | 12 |  |  | $ | 11 |  |
Ameren Illinois:(b) |  |  |  |  |  |  |  |  |
Beginning of period |  |  |  |  |  | $ | 18 |  |  | $ | 18 |  |
Bad debt expense |  |  |  |  |  | 14 |  |  | 9 |  |
Charged to other accounts(a) |  |  |  |  |  | 1 |  |  | 3 |  |
Net write-offs |  |  |  |  |  | (4) |  |  | (4) |  |
End of period |  |  |  |  |  | $ | 29 |  |  | $ | 26 |  |
(a)Amounts associated with the allowance for doubtful accounts related to receivables purchased by Ameren Illinois from alternative retail electric suppliers, as required by the Illinois Public Utilities Act. (b)Ameren Illinois has rate-adjustment mechanisms that allow it to recover the difference between its actual net bad debt write-offs under GAAP, including those associated with receivables purchased from alternative retail electric suppliers, and the amount of net bad debt write-offs included in its base rates. The table above does not include the impact related to the riders. Supplemental Cash Flow Information The following table provides noncash financing and investing activity excluded from the statements of cash flows for the three months ended March 31, 2025 and 2024:
| March 31, 2025 |  | March 31, 2024
Ameren | Ameren Missouri |  | Ameren Illinois | Ameren | Ameren Missouri | Ameren Illinois
Investing: |  |  |  |  |  |  |  |
Accrued capital expenditures, including nuclear fuel expenditures | $ | 381 |  | $ | 214 |  |  | $ | 159 |  |  | $ | 310 |  | $ | 169 |  | $ | 122 |
Net realized and unrealized gain/(loss) – nuclear decommissioning trust fund | (40) |  | (40) |  |  | — |  |  | 74 |  | 74 |  | — |
Financing: |  |  |  |  |  |  |  |
Issuance of common stock for stock-based compensation | $ | 25 |  | $ | — |  |  | $ | — |  |  | $ | 16 |  | $ | — |  | $ | — |
Issuance of common stock under the DRPlus | 9 |  | — |  |  | — |  |  | 7 |  | — |  | — |
Asset Retirement Obligations The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the three months ended March 31, 2025:
| Ameren Missouri |  | Ameren Illinois |  |  |  | Ameren |
Balance at December 31, 2024 | $ | 823 |  | (a) | $ | 4 |  |  |  | (b) | $ | 827 |  | (a)
Liabilities settled | (1) |  |  | — |  |  |  |  | (1) |  |
Accretion | 9 |  | (c) | — |  |  |  |  | 9 |  | (c)
Balance at March 31, 2025 | $ | 831 |  | (a) | $ | 4 |  |  |  | (b) | $ | 835 |  | (a)
(a)Balance included $5 million in “Other current liabilities” on the balance sheet as of both March 31, 2025, and December 31, 2024. (b)Included in “Other deferred credits and liabilities” on the balance sheet. (c)Accretion expense attributable to Ameren Missouri was recorded as a decrease to regulatory liabilities. Stock-based Compensation In the first quarter of 2025, Ameren granted 275,869 performance share units with a grant date fair value of $33 million and 118,213 restricted share units with a grant date fair value of $11 million. Awards vest approximately 3 years after the grant date based on continued employment or on a pro-rata basis upon death or eligible retirement. The performance share units vest based on the achievement of certain specified market performance measures (236,448 performance share units) or clean energy transition targets (39,421 performance share units). The exact number of shares issued pursuant to a performance share unit varies from 0% to 200% of the target award, depending on actual company performance relative to the performance goals. For the three months ended March 31, 2025 and 2024, excess tax benefits (deficiencies) associated with the settlement of stock-based compensation awards decreased income tax expense by $1 million and increased income tax expense by $1 million, respectively. Deferred Compensation At March 31, 2025, and December 31, 2024, the present value of benefits to be paid for deferred compensation obligations was $79 million and $79 million, respectively, which was primarily reflected in “Other deferred credits and liabilities” on Ameren’s consolidated balance sheet. Operating Revenues As of March 31, 2025 and 2024, our remaining performance obligations for contracts with a term greater than one year were immaterial. The Ameren Companies elected not to disclose the aggregate amount of the transaction price allocated to the performance obligations that are unsatisfied as of the end of the reporting period for contracts with an initial expected term of one year or less. See Note 14 – Segment Information for disaggregated revenue information. Excise Taxes Ameren Missouri and Ameren Illinois collect from their customers excise taxes, including municipal and state excise taxes and gross receipts taxes that are levied on the sale or distribution of natural gas and electricity. The following table presents the excise taxes recorded on a gross basis in “Operating Revenues – Electric,” “Operating Revenues – Natural gas” and “Operating Expenses – Taxes other than income taxes” on the statements of income for the three months ended March 31, 2025 and 2024:
|  |  | Three Months
|  |  |  |  | 2025 |  | 2024
Ameren Missouri |  |  |  |  | $ | 38 |  |  | $ | 35 |
Ameren Illinois |  |  |  |  | 43 |  |  | 37 |
Ameren |  |  |  |  | $ | 81 |  |  | $ | 72 |
Earnings per Share The following table reconciles the basic weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding for the three months ended March 31, 2025 and 2024:
|  |  | Three Months
|  |  |  |  | 2025 |  | 2024
Weighted-average Common Shares Outstanding – Basic |  |  |  |  | 270.0 |  |  | 266.4 |
Assumed settlement of performance share units and restricted stock units |  |  |  |  | 1.0 |  |  | 0.4 |
Dilutive effect of forward sale agreements |  |  |  |  | 0.4 |  |  | — |
Weighted-average Common Shares Outstanding – Diluted(a) |  |  |  |  | 271.4 |  |  | 266.8 |
(a)There was an immaterial number of anti-dilutive performance share units excluded from the earnings per diluted share calculations for the three months ended March 31, 2025 and 2024. There were no anti-dilutive shares related to the outstanding forward sale agreements as of March 31, 2025 excluded from earnings per diluted share calculations for three months ended March 31, 2025. The outstanding forward sale agreements as of March 31, 2024 were anti-dilutive for the three months ended March 31, 2024, and were excluded from the earnings per diluted share calculation as calculated using the treasury stock method. For additional information about the outstanding forward sale agreements, see Note 4 – Long-term Debt and Equity Financings.

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