SELECTED QUARTERLY INFORMATION (Unaudited) (In millions, except per share amounts)



Ameren	2017										2016
Quarter ended	March 31		June 30		September 30		December 31				March 31		June 30		September 30		December 31
Operating revenues	$	1,514	$	1,538	$	1,723	$	1,402			$	1,434	$	1,427	$	1,859	$	1,356
Operating income	254		398		581		225				220		325		691		145
Net income (loss)	104		194		290		(59		)	^(a)	107		148		371		33
Net income (loss) attributable to Ameren common shareholders	$	102	$	193	$	288	$	(60	)		$	105	$	147	$	369	$	32
Earnings (loss) per common share – basic	$	0.42	$	0.79	$	1.19	$	(0.24	)		$	0.43	$	0.61	$	1.52	$	0.13
Earnings (loss) per common share – diluted^(b)	$	0.42	$	0.79	$	1.18	$	(0.24	)		$	0.43	$	0.61	$	1.52	$	0.13


(a)	Includes an increase to income tax expense of $154 million recorded in 2017 as a result of the TCJA.


(b)	The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is because of the effects of rounding and the changes in the number of weighted-average diluted shares outstanding each period.



Ameren Missouri Quarter ended	Operating Revenues		Operating Income		Net Income (Loss)				Net Income (Loss) Available to Common Shareholder
March 31, 2017	$	790	$	53	$	6			$	5
March 31, 2016	741		63		15				14
June 30, 2017	935		237		121				120
June 30, 2016	867		197		93				92
September 30, 2017	1,115		417		235				234
September 30, 2016	1,165		431		242				241
December 31, 2017	699		40		(36		)	^(a)	(36		)
December 31, 2016	750		54		10				10


(a)	Includes an increase to income tax expense of $32 million recorded in 2017 as a result of the TCJA.



Ameren Illinois Quarter ended^(a)	Operating Revenues		Operating Income		Net Income		Net Income Available to Common Shareholder
March 31, 2017	$	703	$	172	$	80	$	79
March 31, 2016	677		133		60		59
June 30, 2017	576		130		58		57
June 30, 2016	542		107		46		45
September 30, 2017	575		128		55		55
September 30, 2016	676		230		119		119
December 31, 2017	674		150		78		77
December 31, 2016	595		74		30		29

(a)

In 2017, in connection with the decoupling provisions of the FEJA, Ameren Illinois changed the method it used to recognize its interim-period revenue. Ameren Illinois now recognizes revenue consistent with the timing of incurred electric distribution recoverable costs, and it recognizes revenue associated with the expected return on its rate base ratably over the year. As a result of this change in recognition of the interim period revenue for the IEIMA formula rate framework, as modified by the FEJA, Ameren Illinois incurred quarterly year-over-year increases to earnings in 2017 in comparison to 2016 for the first, second, and fourth quarters and a decrease to earnings in the third quarter. The change in interim period revenue recognition did not affect 2017 annual earnings.