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Related Party Transactions
 12 Months Ended
Dec. 31, 2024
Related Party Transactions [Abstract]  
RELATED PARTY TRANSACTIONS RELATED-PARTY TRANSACTIONS
In the normal course of business, Ameren Missouri and Ameren Illinois engage in affiliate transactions. These transactions primarily consist of natural gas and power purchases and sales, services received or rendered, and borrowings and lendings. Transactions between Ameren’s subsidiaries are reported as affiliate transactions on their individual financial statements, but those transactions are eliminated in consolidation for Ameren’s consolidated financial statements. Below are the material related-party agreements.
Electric Power Supply Agreements
Ameren Illinois must acquire capacity and energy sufficient to meet its obligations to customers. Ameren Illinois uses periodic RFP processes, administered by the IPA and approved by the ICC, to contract capacity and energy on behalf of its customers. Ameren Missouri participates in the RFP process and has been a winning supplier for certain periods.
Capacity Supply Agreements
In procurement events in 2021, Ameren Missouri contracted to supply a portion of Ameren Illinois’ capacity requirements for $2 million from June 2022 through May 2023.
Energy Product Agreements
Based on the outcome of IPA-administered procurement events, Ameren Missouri and Ameren Illinois have entered into energy product agreements by which Ameren Missouri agreed to sell, and Ameren Illinois agreed to purchase, a set amount of MWhs at a predetermined price over a specified period of time. The following table presents the specified performance period, amount of MWhs, and average price per MWh included in the agreements:
IPA Procurement EventPerformance PeriodMWhsAverage Price per MWh
September 2020September 2021 – November 2022204,80031 
April 2021July 2022 – November 202233,60034 
September 2021January 2022 – September 2023136,00037 
Interconnection Agreements
Ameren Missouri and Ameren Illinois are parties to an interconnection agreement that governs the connection of their respective transmission lines and other facilities used for the distribution of power. These agreements have no contractual expiration date, but may be terminated by either party with three years’ notice.
Ameren Missouri and ATXI are parties to an interconnection agreement that governs the connection of the High Prairie Energy Center to an ATXI transmission line that allows Ameren Missouri to distribute power generated from the High Prairie Energy Center.
Ameren Missouri and Ameren Illinois are parties to interconnection agreements that govern the connection of the Cass County and Boomtown energy centers to Ameren Illinois transmission lines that allows Ameren Missouri to distribute power generated from the Cass County and Boomtown energy centers.
Support Services Agreements
Ameren Services provides support services to its affiliates. The costs of support services including wages, employee benefits, professional services, and other expenses, are based on, or are an allocation of, actual costs incurred. The support services agreement can be terminated at any time by the mutual agreement of Ameren Services and that affiliate or by either party with 60 days’ notice before the end of a calendar year.
In addition, Ameren Missouri and Ameren Illinois provide affiliates with access to their facilities for administrative purposes and with use of other assets. The costs of the rent and facility services and other assets are based on, or are an allocation of, actual costs incurred.
Ameren Missouri and Ameren Illinois also provide storm-related and miscellaneous support services to each other on an as-needed basis.
Ameren Missouri and Ameren Illinois had long-term receivables included in “Other assets” from Ameren Services of $29 million and $32 million, respectively, as of December 31, 2024, and $31 million and $34 million, respectively, as of December 31, 2023, related to Ameren Services’ allocated portion of Ameren’s pension and postretirement benefit plans.
Transmission Services
Ameren Missouri and Ameren Illinois each receives transmission services from ATXI for their respective retail loads.
Electric Transmission Maintenance and Construction Agreements
ATXI entered into separate agreements with Ameren Missouri and Ameren Illinois in which Ameren Missouri or Ameren Illinois, as applicable, may perform certain maintenance and construction services related to ATXI’s electric transmission assets.
Money Pool
See Note 4 – Short-term Debt and Liquidity for a discussion of affiliate borrowing arrangements.
Long-Term Debt, Net - Related Parties
In November and December 2024, Ameren (parent) purchased senior secured notes and first mortgage bonds issued by Ameren Missouri, and first mortgage bonds issued by Ameren Illinois. See Note 5 – Long-term Debt and Equity Financings for additional information.
Tax Allocation Agreement
See Note 1 – Summary of Significant Accounting Policies for a discussion of the tax allocation agreement. The following table presents the affiliate balances related to income taxes for Ameren Missouri and Ameren Illinois as of December 31, 2024 and 2023:
20242023
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$— $32 $— $2 
Income taxes receivable from parent(b)
28 — 56 22 
(a)Included in “Accounts payable – affiliates” on the balance sheet.
(b)Included in “Accounts receivable – affiliates” on the balance sheet.
Capital Contributions
The following table presents cash capital contributions received from Ameren (parent) by Ameren Missouri and Ameren Illinois for the years ended December 31, 2024, 2023, and 2022:
202420232022
Ameren Missouri(a)
$476 $— $— 
Ameren Illinois(a)
36 91 15 
(a)Includes capital contributions made as a result of the tax allocation agreement.
Effects of Related-party Transactions on the Statement of Income
The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the years ended December 31, 2024, 2023, and 2022. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-term Debt and Liquidity.
AgreementIncome Statement Line ItemAmeren
Missouri		Ameren
Illinois
Ameren Missouri power supply agreementsOperating Revenues2024$— $(a)
with Ameren Illinois20232 (a)
  20229 (a)
Ameren Missouri and Ameren IllinoisOperating Revenues202431 1 
rent and facility services202332 (b)
  202225 (b)
Ameren Missouri and Ameren IllinoisOperating Revenues20242 2 
miscellaneous support services2023(b)2 
2022(b)2 
Total Operating Revenues2024$33 $3 
202334 2 
  202234 2 
Ameren Illinois power supplyPurchased Power2024$(a)$— 
agreements with Ameren Missouri2023(a)2 
  2022(a)9 
Ameren Missouri and Ameren IllinoisPurchased Power20249 2 
transmission services from ATXI20232 1 
20221 (b)
Total Purchased Power2024$9 $2 
20232 3 
20221 9 
Ameren Missouri and Ameren IllinoisOther Operations and 2024$1 $1 
rent and facility servicesMaintenance2023(b)3 
2022(b)3 
Ameren Services support servicesOther Operations and2024169 158 
agreementMaintenance2023148 138 
  2022150 141 
Total Other Operations and2024$170 $159 
Maintenance Expenses2023148 141 
  2022150 144 
Money pool borrowings (advances)(Interest Charges)2024$(4)$(b)
Other Income, Net2023(b)(b)
  2022(b)(b)
Long-term debt, net - related parties(Interest Charges)2024(b)(b)
2023(a)(a)
2022(a)(a)
(a)Not applicable.
(b)Amount less than $1 million.