v3.26.3
Supplemental Information
 9 Months Ended
Sep. 30, 2026
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 September 30, 2026, and December 31, 2025:
September 30, 2026December 31, 2025
AmerenAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois
“Cash and cash equivalents”$40 $26 $11 $13 $6 $3 
Restricted cash included in “Other current assets”56 45 6 63 54 5 
Restricted cash included in “Other assets”426 — 426 336 — 336 
Restricted cash included in “Nuclear decommissioning trust fund”3 3 — 8 8 — 
Total cash, cash equivalents, and restricted cash$525 $74 $443 $420 $68 $344 
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 September 30, 2026, and December 31, 2025, Ameren’s and Ameren Illinois’ balance sheets included payables for purchased receivables of $65 million and $47 million, respectively. On Ameren’s balance sheet, these amounts were included in “Other current liabilities”.
The following table provides a reconciliation of the beginning and ending amount of the allowance for doubtful accounts for the three and nine months ended September 30, 2026 and 2025:
Three MonthsNine Months
2026202520262025
Ameren:
Beginning of period$45 $39 $39 $30 
Bad debt expense21 18 42 37 
Charged to other accounts(a)
3 2 6 5 
Net write-offs(22)(21)(40)(34)
End of period$47 $38 $47 $38 
Ameren Missouri:
Beginning of period$17 $12 $17 $12 
Bad debt expense7 7 13 11 
Net write-offs(5)(4)(11)(8)
End of period$19 $15 $19 $15 
Ameren Illinois:(b)
Beginning of period$28 $27 $22 $18 
Bad debt expense14 

11 29 26 
Charged to other accounts(a)
3 2 6 5 
Net write-offs(17)(17)(29)(26)
End of period$28 $23 $28 $23 
(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 nine months ended September 30, 2026 and 2025:
September 30, 2026September 30, 2025
AmerenAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois
Investing:
Accrued capital expenditures, including nuclear fuel expenditures$503 

$312 

$148 $412 $277 $147 
Net realized and unrealized gain – nuclear decommissioning trust fund91 91 — 136 136 — 
Financing:
Issuance of common stock for stock-based compensation$25 $— $— $25 $— $— 
Issuance of common stock under the DRPlus6 — — 7 — — 
Asset Retirement Obligations
The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the nine months ended September 30, 2026:
Ameren
Missouri		Ameren
Illinois		Ameren
Balance at December 31, 2025
$849 
(a) 
$5 
(b) 
$854 
(a) 
Liabilities incurred7 — 7 
Liabilities settled(3)(c)(3)
Accretion28 
(d) 
(c)28 
(d) 
Change in estimates(20)— (20)
Balance at September 30, 2026
$861 
(a) 
$5 
(b) 
$866 
(a) 
(a)Balance included $3 million and $5 million in “Other current liabilities” on the balance sheet as of September 30, 2026, and December 31, 2025, respectively.
(b)Included in “Other deferred credits and liabilities” on the balance sheet.
(c)Amount less than $1 million.
(d)Accretion expense attributable to Ameren Missouri was recorded as a decrease to regulatory liabilities.
Deferred Compensation
At September 30, 2026, and December 31, 2025, the present value of benefits to be paid for deferred compensation obligations was $80 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 September 30, 2026 and 2025, 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 and nine months ended September 30, 2026 and 2025:
Three MonthsNine Months
2026202520262025
Ameren Missouri$75 $69 $162 $150 
Ameren Illinois34 30 111 104 
Ameren$109 $99 $273 $254 
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 and nine months ended September 30, 2026 and 2025:
Three MonthsNine Months
2026202520262025
Weighted-average Common Shares Outstanding – Basic276.8 270.4 276.7 270.2 
Assumed settlement of performance share units and restricted stock units1.1 0.8 1.0 0.9 
Dilutive effect of forward sale agreements1.0 1.0 1.0 0.6 
Weighted-average Common Shares Outstanding – Diluted(a)
278.9 272.2 278.7 271.7 
(a)There was an immaterial number of anti-dilutive performance share units excluded from the earnings per diluted share calculations for the three and nine months ended September 30, 2026 and 2025. Outstanding forward sale agreements as of September 30, 2026 and 2025 that were anti-dilutive for the three and nine months ended September 30, 2026 and 2025 were excluded from earnings per diluted share as calculated using the treasury stock method, including 6.0 million and 12.3 million shares for the three and nine months ended September 30, 2026 and an immaterial number of shares for the three and nine months ended September 30, 2025. For additional information about the outstanding forward sale agreements, see Note 4 – Long-term Debt and Equity Financings.