Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2020

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

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, 2020 and December 31, 2019:


	2020				2019
	Ameren Missouri		Ameren Illinois		Ameren Missouri		Ameren Illinois
Income taxes payable to parent(a)	$	—	$	6	$	15	$	43
Income taxes receivable from parent(b)	9		15		15		17

(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, 2020, 2019, and 2018:


	2020			2019			2018
Ameren Missouri(a)	$	491		$	124		$	45
Ameren Illinois	464		(a)	15		(a)	160

(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, 2020, 2019, and 2018. 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	2020	$	11	$	(a)
with Ameren Illinois		2019		3		(a)
		2018		11		(a)
Ameren Missouri and Ameren Illinois	Operating Revenues	2020		26		1
rent and facility services		2019		27		2
		2018		22		3
Ameren Missouri and Ameren Illinois miscellaneous	Operating Revenues	2020		3		1
support services and services provided to ATXI		2019		1		2
		2018		1		1
Ameren Missouri software licensing	Operating Revenues	2020		(a)		(a)
with Ameren Illinois		2019		(a)		19
		2018		(a)		(a)
Total Operating Revenues		2020	$	40	$	2
		2019		31		23
		2018		34		4
Ameren Illinois power supply	Purchased Power	2020	$	(a)	$	11
agreements with Ameren Missouri		2019		(a)		3
		2018		(a)		11
Ameren Missouri and Ameren Illinois	Purchased Power	2020		(a)		2
transmission services from ATXI		2019		(a)		2
		2018		(a)		1
Total Purchased Power		2020	$	(a)	$	13
		2019		(a)		5
		2018		(a)		12
Ameren Missouri and Ameren Illinois	Other Operations and	2020	$	(b)	$	4
rent and facility services	Maintenance	2019		2		5
		2018		3		6
Ameren Services support services	Other Operations and	2020		140		133
agreement	Maintenance	2019		135		127
		2018		136		126
Total Other Operations and		2020	$	140	$	137
Maintenance Expenses		2019		137		132
		2018		139		132
Money pool borrowings (advances)	(Interest Charges)	2020	$	(b)	$	(b)
	Other Income, Net	2019		(b)		(b)
		2018		1		(b)

(a)Not applicable.

(b)Amount less than $1 million.