Related Party Transactions

12 Months Ended

Dec. 31, 2022

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, average price per MWh, and amount of MWhs included in the agreements:


IPA Procurement Event	Performance Period	MWhs	Average Price per MWh
April 2019	January 2020 – December 2021	288,000	$	35
September 2019	April 2020 – November 2021	170,800	29
September 2020	September 2021 – November 2022	204,800	31
April 2021	July 2022 – November 2022	33,600	34
September 2021	January 2022 – September 2023	136,000	37

Collateral Postings

Under the terms of the Illinois energy product agreements entered into through RFP processes administered by the IPA, suppliers must post collateral under certain market conditions to protect Ameren Illinois in the event of nonperformance. The collateral postings are unilateral, which means that only the suppliers can be required to post collateral. Therefore, Ameren Missouri, as a winning supplier in the RFP process, may be required to post collateral. As of December 31, 2022 and 2021, there were no collateral postings required of Ameren Missouri related to the Illinois energy product agreements.

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 Renewable Energy Center to an ATXI transmission line that allows Ameren Missouri to distribute power generated from the High Prairie Renewable Energy Center.

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 $41 million and $43 million, respectively, as of December 31, 2022, and $77 million and $80 million, respectively, as of December 31, 2021, 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.

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, 2022 and 2021:


	2022				2021
	Ameren Missouri		Ameren Illinois		Ameren Missouri		Ameren Illinois
Income taxes payable to parent(a)	$	—	$	50	$	—	$	8
Income taxes receivable from parent(b)	39		—		27		18

(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, 2022, 2021, and 2020:


	2022		2021		2020
Ameren Missouri(a)	$	—	$	207	$	491
Ameren Illinois(a)	15		262		464

(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, 2022, 2021, and 2020. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-term Debt and Liquidity.


Agreement	Income Statement Line Item			Ameren Missouri		Ameren Illinois
Ameren Missouri power supply agreements	Operating Revenues	2022	$	9	$	(a)
with Ameren Illinois		2021		16		(a)
		2020		11		(a)
Ameren Missouri and Ameren Illinois	Operating Revenues	2022		25		(b)
rent and facility services		2021		26		1
		2020		26		1
Ameren Missouri and Ameren Illinois	Operating Revenues	2022		(b)		2
miscellaneous support services		2021		(b)		5
		2020		3		1



Total Operating Revenues		2022	$	34	$	2
		2021		42		6
		2020		40		2
Ameren Illinois power supply	Purchased Power	2022	$	(a)	$	9
agreements with Ameren Missouri		2021		(a)		16
		2020		(a)		11
Ameren Missouri and Ameren Illinois	Purchased Power	2022		1		(b)
transmission services from ATXI		2021		4		1
		2020		(a)		2
Total Purchased Power		2022	$	1	$	9
		2021		4		17
		2020		(a)		13
Ameren Missouri and Ameren Illinois	Other Operations and	2022	$	(b)	$	3
rent and facility services	Maintenance	2021		1		4
		2020		(b)		4
Ameren Services support services	Other Operations and	2022		150		141
agreement	Maintenance	2021		147		137
		2020		140		133
Total Other Operations and		2022	$	150	$	144
Maintenance Expenses		2021		148		141
		2020		140		137
Money pool borrowings (advances)	(Interest Charges)	2022	$	(b)	$	(b)
	Other Income, Net	2021		(b)		(b)
		2020		(b)		(b)

(a)Not applicable.

(b)Amount less than $1 million.