Quarterly Financial Information (Unaudited)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information [Line Items]

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

Summarized quarterly financial information for 2017 and 2016 is as follows:



						Consolidated Net Income Attributable to Southern Company			Per Common Share
	Operating Revenues		Operating Income						Basic Earnings			Diluted Earnings					Trading Price Range
Quarter Ended	Operating Revenues		Operating Income						Basic Earnings			Diluted Earnings			Dividends		High		Low
	(in millions)
March 2017	$	5,771	$	1,306		$	658		$	0.66		$	0.66		$	0.5600	$	51.47	$	47.57
June 2017	5,430		(1,594		)	(1,381		)	(1.38		)	(1.37		)	0.5800		51.97		47.87
September 2017	6,201		2,045			1,069			1.07			1.06			0.5800		50.80		46.71
December 2017	5,629		794			496			0.49			0.49			0.5800		53.51		47.92

March 2016	$	3,992	$	940		$	489		$	0.53		$	0.53		$	0.5425	$	51.73	$	46.00
June 2016	4,459		1,185			623			0.67			0.66			0.5600		53.64		47.62
September 2016	6,264		1,917			1,139			1.18			1.17			0.5600		54.64		50.00
December 2016	5,181		587			197			0.20			0.20			0.5600		52.23		46.20

As a result of the revisions to the cost estimate for the Kemper IGCC and its June 2017 suspension, Mississippi Power recorded total pre-tax charges to income related to the Kemper IGCC of $208 million ($185 million after tax) in the fourth quarter 2017, $34 million ($21 million after tax) in the third quarter 2017, $3.0 billion ($2.1 billion after tax) in the second quarter 2017, $108 million ($67 million after tax) in the first quarter 2017, $206 million ($127 million after tax) in the fourth quarter 2016, $88 million ($54 million after tax) in the third quarter 2016, $81 million ($50 million after tax) in the second quarter 2016, and $53 million ($33 million after tax) in the first quarter 2016. See Note 3 under "Kemper County Energy Facility" for additional information.

As a result of the Tax Reform Legislation, the Southern Company system recorded a total income tax benefit of $264 million in the fourth quarter 2017. See Note 5 for additional information.

The Southern Company system's business is influenced by seasonal weather conditions.

ALABAMA POWER CO

Quarterly Financial Information [Line Items]

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

Summarized quarterly financial information for 2017 and 2016 is as follows:



Quarter Ended	Operating Revenues		Operating Income		Net Income After Dividends on Preferred and Preference Stock
	(in millions)
March 2017	$	1,382	$	376	$	174
June 2017	1,484		454		230
September 2017	1,740		616		325
December 2017	1,433		268		119

March 2016	$	1,331	$	333	$	156
June 2016	1,444		430		213
September 2016	1,785		650		351
December 2016	1,329		252		102

The Company's business is influenced by seasonal weather conditions.

GEORGIA POWER CO

Quarterly Financial Information [Line Items]

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

Summarized quarterly financial information for 2017 and 2016 is as follows:



Quarter Ended	Operating Revenues		Operating Income		Net Income After Dividends on Preferred and Preference Stock
	(in millions)
March 2017	$	1,832	$	501	$	260
June 2017	2,048		639		347
September 2017	2,546		1,034		580
December 2017	1,884		470		227

March 2016	$	1,872	$	509	$	269
June 2016	2,051		656		349
September 2016	2,698		1,054		599
December 2016	1,762		258		113

The Company's business is influenced by seasonal weather conditions.

GULF POWER CO

Quarterly Financial Information [Line Items]

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

Summarized quarterly financial information for 2017 and 2016 is as follows:



Quarter Ended	Operating Revenues		Operating Income		Net Income After Dividends on Preference Stock
	(in millions)
March 2017	$	350	$	46	$	18
June 2017	357		75		35
September 2017	437		115		63
December 2017	372		53		19

March 2016	$	335	$	65	$	29
June 2016	365		74		34
September 2016	436		90		45
December 2016	349		54		23

The Company's business is influenced by seasonal weather conditions.

MISSISSIPPI POWER CO

Quarterly Financial Information [Line Items]

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

Summarized quarterly financial information for 2017 and 2016 is as follows:



Quarter Ended	Operating Revenues		Operating Income (Loss)			Net Income (Loss) After Dividends on Preferred Stock
	(in millions)
March 2017	$	272	$	(62	)	$	(20	)
June 2017	303		(2,954		)	(2,054		)
September 2017	341		51			40
December 2017	271		(177		)	(556		)

March 2016	$	257	$	(10	)	$	11
June 2016	277		(28		)	2
September 2016	352		9			26
December 2016	277		(166		)	(89		)

As a result of the revisions to the cost estimate for the Kemper IGCC and its June 2017 suspension, the Company recorded total pre-tax charges to income related to the Kemper IGCC of $208 million ($185 million after tax) in the fourth quarter 2017, $34 million ($21 million after tax) in the third quarter 2017, $3.0 billion ($2.1 billion after tax) in the second quarter 2017, $108 million ($67 million after tax) in the first quarter 2017, $206 million ($127 million after tax) in the fourth quarter 2016, $88 million ($54 million after tax) in the third quarter 2016, $81 million ($50 million after tax) in the second quarter 2016, and $53 million ($33 million after tax) in the first quarter 2016. See Note 3 under "Kemper County Energy Facility" for additional information.

As a result of Tax Reform Legislation, the Company recorded total income tax expense of $372 million in the fourth quarter 2017. See Note 5 for additional information.

The Company's business is influenced by seasonal weather conditions.

SOUTHERN POWER CO

Quarterly Financial Information [Line Items]

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

Summarized quarterly financial information for 2017 and 2016 is as follows:



Quarter Ended	Operating Revenues		Operating Income		Income Tax (Benefit)			Net Income Attributable to the Company
	(in millions)
March 2017	$	450	$	65	$	(52	)	$	70
June 2017	529		112		(38		)	82
September 2017	618		159		(39		)	124
December 2017 ^(*)	478		32		(810		)	795

March 2016	$	315	$	47	$	(23	)	$	50
June 2016	373		81		(41		)	89
September 2016	500		134		(102		)	176
December 2016	389		28		(29		)	23


(*)	As a result of the Tax Reform Legislation, the Company recorded an income tax benefit of $743 million in the fourth quarter 2017. See Note 5 for additional information.

The Company's business is influenced by seasonal weather conditions.

SOUTHERN Co GAS

Quarterly Financial Information [Line Items]

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

Summarized quarterly financial information for the successor year ended December 31, 2017 and the successor period of July 1, 2016 through December 31, 2016 and for the predecessor period of January 1, 2016 through June 30, 2016 are as follows:



Quarter Ended	Operating Revenues		Operating Income (Loss)			EBIT			Net Income (Loss) Attributable to Southern Company Gas
	(in millions)
Successor - 2017
March 2017	$	1,560	$	391		$	435		$	239
June 2017	716		96			128			49
September 2017^(a)	565		68			118			15
December 2017^(a)(b)	1,079		110			129			(60		)
Predecessor - January 1, 2016 through June 30, 2016	(in millions)
March 2016	$	1,334	$	348		$	351		$	182
June 2016	571		(27		)	(23		)	(51		)
Successor - July 1, 2016 through December 31, 2016	(in millions)
September 2016	$	543	$	12		$	50		$	4
December 2016	1,109		185			221			110


(a)	Net income (loss) attributable to Southern Company Gas includes the impact of new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings.


(b)	Net loss attributable to Southern Company Gas includes the impact of the Tax Reform Legislation.

The Company's business is influenced by seasonal weather conditions.

See Note 11 under "Merger with Southern Company" for information on the Merger.