Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2017

The following table presents the agreements the companies have entered into, as well as the specified performance period, price, and amount of megawatthours included in each agreement:



IPA Procurement Event	Performance Period	MWh		Average Price per MWh
May 2014	January 2015 – February 2017	168,400	$	51
April 2015	June 2015 – June 2017	667,000		36
September 2015	November 2015 – May 2018	339,000		38
April 2016	June 2017 – September 2018	375,200		35
September 2016	May 2017 – September 2018	82,800		34
April 2017	March 2019 – May 2020	85,600		34

The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the years ended December 31, 2017, 2016, and 2015. 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	2017	$	23	$	(a)
with Ameren Illinois		2016		28		(a)
		2015		15		(a)
Ameren Missouri and Ameren Illinois	Operating Revenues	2017		26		4
rent and facility services		2016		25		5
		2015		25		4
Ameren Missouri and Ameren Illinois	Operating Revenues	2017		(b)		1
miscellaneous support services		2016		1		(b)
		2015		2		(b)
Total Operating Revenues		2017	$	49	$	5
		2016		54		5
		2015		42		4
Ameren Illinois power supply	Purchased Power	2017	$	(a)	$	23
agreements with Ameren Missouri		2016		(a)		28
		2015		(a)		15
Ameren Illinois transmission	Purchased Power	2017		(a)		2
services from ATXI		2016		(a)		2
		2015		(a)		2
Total Purchased Power		2017	$	(a)	$	25
		2016		(a)		30
		2015		(a)		17
Ameren Services support services	Other Operations and	2017	$	149	$	139
agreement	Maintenance	2016		129		123
		2015		131		119
Money pool borrowings (advances)	(Interest Charges)	2017	$	1	$	(b)
	Miscellaneous Income	2016		(b)		(b)
		2015		(b)		(b)


(a)	Not applicable.


(b)	Amount less than $1 million.