Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2021

The following table presents the specified performance period, price, and amount of MWhs included in the agreements:


IPA Procurement Event	Performance Period	MWh	Average Price per MWh
April 2017	March 2019 – May 2020	85,600	$	34
April 2018	June 2019 – September 2020	110,000	32
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

Schedule of Affiliate Receivables and Payables

The following table presents the affiliate balances related to income taxes for Ameren Missouri and Ameren Illinois as of December 31, 2021 and December 31, 2020:


	2021				2020
	Ameren Missouri		Ameren Illinois		Ameren Missouri		Ameren Illinois
Income taxes payable to parent(a)	$	—	$	8	$	—	$	6
Income taxes receivable from parent(b)	27		18		9		15

(a)Included in “Accounts payable – affiliates” on the balance sheet.

(b)Included in “Accounts receivable – affiliates” on the balance sheet

Schedule of 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, 2021, 2020, and 2019:


	2021		2020		2019
Ameren Missouri(a)	$	207	$	491	$	124
Ameren Illinois(a)	262		464		15

(a)Includes capital contributions made as a result of the tax allocation agreement.

Schedule of Related Party Transactions

The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the years ended December 31, 2021, 2020, and 2019. 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	2021	$	16	$	(a)
with Ameren Illinois		2020		11		(a)
		2019		3		(a)
Ameren Missouri and Ameren Illinois	Operating Revenues	2021		26		1
rent and facility services		2020		26		1
		2019		27		2
Ameren Missouri and Ameren Illinois miscellaneous	Operating Revenues	2021		(b)		5
support services and services provided to ATXI		2020		3		1
		2019		1		2
Ameren Missouri software licensing	Operating Revenues	2021		(a)		(a)
with Ameren Illinois		2020		(a)		(a)
		2019		(a)		19
Total Operating Revenues		2021	$	42	$	6
		2020		40		2
		2019		31		23
Ameren Illinois power supply	Purchased Power	2021	$	(a)	$	16
agreements with Ameren Missouri		2020		(a)		11
		2019		(a)		3
Ameren Missouri and Ameren Illinois	Purchased Power	2021		4		1
transmission services from ATXI		2020		(a)		2
		2019		(a)		2
Total Purchased Power		2021	$	4	$	17
		2020		(a)		13
		2019		(a)		5
Ameren Missouri and Ameren Illinois	Other Operations and	2021	$	1	$	4
rent and facility services	Maintenance	2020		(b)		4
		2019		2		5
Ameren Services support services	Other Operations and	2021		147		137
agreement	Maintenance	2020		140		133
		2019		135		127
Total Other Operations and		2021	$	148	$	141
Maintenance Expenses		2020		140		137
		2019		137		132
Money pool borrowings (advances)	(Interest Charges)	2021	$	(b)	$	(b)
	Other Income, Net	2020		(b)		(b)
		2019		(b)		(b)

(a)Not applicable.

(b)Amount less than $1 million.