Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following tables disaggregate revenue sources for the three and six months ended June 30, 2018:

	For the Three Months Ended June 30, 2018			For the Six Months Ended June 30, 2018
	(in millions)
Southern Company
Operating revenues
Retail electric revenues(a)
Residential	$	1,579		$	3,118
Commercial	1,315			2,557
Industrial	814			1,569
Other	32			64
Natural gas distribution revenues	642			1,865
Alternative revenue programs(b)	(4		)	(27		)
Total retail electric and gas distribution revenues	$	4,378		$	9,146
Wholesale energy revenues(c)(d)	459			928
Wholesale capacity revenues(d)	152			302
Other natural gas revenues(e)	68			476
Other revenues(f)	570			1,147
Total operating revenues	$	5,627		$	11,999

(a) Retail electric revenues include $18 million and $36 million of leases for the three and six months ended June 30, 2018, respectively, and a net increase of $68 million and $101 million for the three and six months ended June 30, 2018, respectively, from certain cost recovery mechanisms that are not accounted for as revenue under ASC 606. See Note 3 to the financial statements of Southern Company under "Regulatory Matters" in Item 8 of the Form 10-K for additional information on cost recovery mechanisms.

(b) See Note 1 to the financial statements of Southern Company under "Revenues" in Item 8 of the Form 10-K for additional information on alternative revenue programs at the natural gas distribution utilities. Alternative revenue program revenues are presented net of any previously recognized program amounts billed to customers during the same accounting period.

(c) Wholesale energy revenues include $61 million and $155 million for the three and six months ended June 30, 2018, respectively, of revenues accounted for as derivatives, primarily related to physical energy sales in the wholesale electricity market. See Note (I) for additional information on energy-related derivative contracts.

(d) Wholesale energy and wholesale capacity revenues include $118 million and $31 million, respectively, for the three months ended June 30, 2018 and $187 million and $61 million, respectively, for the six months ended June 30, 2018 of PPA contracts accounted for as leases.

(e) Other natural gas revenues related to Southern Company Gas' energy and risk management activities are presented net of the related costs of those activities and include gross third-party revenues of $1.3 billion and $3.3 billion for the three and six months ended June 30, 2018, respectively, of which $0.7 billion and $1.8 billion, respectively, relates to contracts that are accounted for as derivatives. See Note (L) under "Southern Company Gas" for additional information on the components of wholesale gas services operating revenues.

(f) Other revenues include $89 million and $183 million for the three and six months ended June 30, 2018, respectively, of revenues not accounted for under ASC 606.

	Alabama Power		Georgia Power		Gulf Power		Mississippi Power
	(in millions)
For the Three Months Ended June 30, 2018
Operating revenues
Retail revenues(a)(b)
Residential	$	557	$	785	$	172	$	65
Commercial	402		749		96		68
Industrial	372		335		31		76
Other	7		20		2		3
Total retail electric revenues	$	1,338	$	1,889	$	301	$	212
Wholesale energy revenues(c)	71		26		21		73
Wholesale capacity revenues	25		13		6		1
Other revenues(b)(d)	69		120		16		11
Total operating revenues	$	1,503	$	2,048	$	344	$	297
For the Six Months Ended June 30, 2018
Operating revenues
Retail revenues(a)(b)
Residential	$	1,127	$	1,529	$	337	$	125
Commercial	774		1,466		188		130
Industrial	710		650		63		146
Other	13		43		3		5
Total retail electric revenues	$	2,624	$	3,688	$	591	$	406
Wholesale energy revenues(c)	172		66		56		167
Wholesale capacity revenues	49		27		12		5
Other revenues(b)(d)	131		227		33		20
Total operating revenues	$	2,976	$	4,008	$	692	$	598

(a) Retail revenues at Alabama Power, Georgia Power, Gulf Power, and Mississippi Power include a net increase or (net reduction) of $78 million, $3 million, $(12) million, and $(1) million, respectively, for the three months ended June 30, 2018 and $125 million, $12 million, $(28) million, and $(8) million, respectively, for the six months ended June 30, 2018 related to certain cost recovery mechanisms that are not accounted for as revenue under ASC 606. See Note 3 to the financial statements of Alabama Power, Georgia Power, Gulf Power, and Mississippi Power under "Retail Regulatory Matters" in Item 8 of the Form 10-K for additional information on cost recovery mechanisms.

(b) Retail revenues and other revenues at Georgia Power include $18 million and $33 million, respectively, for the three months ended June 30, 2018 and $36 million and $66 million, respectively, for the six months ended June 30, 2018 of revenues accounted for as leases.

(c) Wholesale energy revenues at Alabama Power and Georgia Power include $4 million and $5 million, respectively, for the three months ended June 30, 2018 and $9 million and $13 million, respectively, for the six months ended June 30, 2018 accounted for as derivatives primarily related to physical energy sales in the wholesale electricity market. See Note (I) for additional information on energy-related derivative contracts.

(d) Other revenues at Alabama Power, Georgia Power, and Gulf Power include $26 million, $26 million, and $2 million, respectively, for the three months ended June 30, 2018 and $52 million, $53 million, and $4 million, respectively, for the six months ended June 30, 2018 of revenues not accounted for under ASC 606.

	For the Three Months Ended June 30, 2018		For the Six Months Ended June 30, 2018
	(in millions)
Southern Power
PPA capacity revenues(a)	$	144	$	282
PPA energy revenues(a)	302		556
Non-PPA revenues(b)	106		221
Other revenues	3		5
Total operating revenues	$	555	$	1,064

(a) PPA capacity revenues and PPA energy revenues include $47 million and $127 million, respectively, for the three months ended June 30, 2018 and $94 million and $203 million, respectively, for the six months ended June 30, 2018 related to PPAs accounted for as leases. See Note 1 to the financial statements of Southern Power under "Revenues" in Item 8 of the Form 10-K for additional information on capacity revenues accounted for as leases.

(b) Non-PPA revenues include $50 million and $129 million for the three and six months ended June 30, 2018, respectively, of revenues from short-term sales related to physical energy sales from uncovered capacity in the wholesale electricity market. See Note 1 to the financial statements of Southern Power under "Revenues" in Item 8 of the Form 10-K and Note (I) for additional information on energy-related derivative contracts.

	For the Three Months Ended June 30, 2018			For the Six Months Ended June 30, 2018
	(in millions)
Southern Company Gas
Operating revenues
Natural gas distribution revenues
Residential	$	273		$	933
Commercial	76			268
Transportation	7			24
Industrial	228			505
Other	58			135
Alternative revenue programs(a)	(4		)	(27		)
Total natural gas distribution revenues	$	638		$	1,838
Gas marketing services(b)	89			359
Wholesale gas services(c)	(15		)	131
Gas midstream operations	18			40
Other revenues	—			1
Total operating revenues	$	730		$	2,369

(a) See Note 1 to the financial statements of Southern Company Gas under "Revenues" in Item 8 of the Form 10-K for additional information on alternative revenue programs at the natural gas distribution utilities. Alternative revenue program revenues are presented net of any previously recognized program amounts billed to customers during the same accounting period.

(b) Gas marketing services includes $4 million for the six months ended June 30, 2018 of revenues not accounted for under ASC 606.

(c) Wholesale gas services revenues are presented net of the related costs associated with its energy trading and risk management activities. Operating revenues, as presented, include gross third-party revenues of $1.3 billion and $3.3 billion for the three and six months ended June 30, 2018, respectively, of which $0.7 billion and $1.8 billion, respectively, relates to contracts that are accounted for as derivatives. See Note (L) under "Southern Company Gas" for additional information on the components of wholesale gas services operating revenues and Note (I) for additional information on energy-related derivative contracts.

Contract with Customer, Asset and Liability

The following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers as of June 30, 2018:

	Receivables		Contract Assets		Contract Liabilities
	(in millions)
Southern Company	$	2,785	$	33	$	36
Alabama Power	603		—		10
Georgia Power	840		9		9
Gulf Power	169		—		1
Mississippi Power	83		—		—
Southern Power	136		—		4
Southern Company Gas	570		—		1

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

Revenues from contracts with customers related to these performance obligations remaining at June 30, 2018 are expected to be recognized as follows:

	2018		2019		2020		2021		2022		2023 and Thereafter
	(in millions)
Southern Company(*)	$	263	$	352	$	322	$	322	$	310	$	1,960
Alabama Power	11		22		22		26		23		161
Georgia Power	20		41		38		40		30		113
Gulf Power	11		22		—		—		—		—
Mississippi Power	2		3		3		1		—		—
Southern Power(*)	211		310		283		277		276		1,809

(*) Excludes amounts related to held for sale assets. See Note (J) under "Southern Company's Sale of Gulf Power" and "Southern Power – Sale of Florida Plants" for additional information.