Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 1,433	$ 1,975
Receivables —
Customer accounts receivable	1,600	1,565
Energy marketing receivables	482	623
Unbilled revenues	593	706
Under recovered regulatory clause revenues	26	18
Income taxes receivable, current	544	544
Other accounts and notes receivable	513	377
Accumulated provision for uncollectible accounts	(52)	(43)
Materials and supplies	1,461	1,462
Fossil fuel for generation	624	689
Natural gas for sale	477	631
Prepaid expenses	361	364
Other regulatory assets, current	569	581
Other current assets	206	230
Total current assets	8,837	9,722
Property, Plant, and Equipment:
In service	101,021	98,416
Less: Accumulated depreciation	30,667	29,852
Plant in service, net of depreciation	70,354	68,564
Nuclear fuel, at amortized cost	892	905
Construction work in progress	7,440	8,977
Total property, plant, and equipment	78,686	78,446
Other Property and Investments:
Goodwill	6,271	6,251
Equity investments in unconsolidated subsidiaries	1,632	1,549
Other intangible assets, net of amortization	929	970
Nuclear decommissioning trusts, at fair value	1,722	1,606
Leveraged leases	782	774
Miscellaneous property and investments	230	270
Total other property and investments	11,566	11,420
Deferred Charges and Other Assets:
Deferred charges related to income taxes	1,325	1,629
Unamortized loss on reacquired debt	215	223
Other regulatory assets, deferred	6,668	6,851
Other deferred charges and assets	1,387	1,406
Total deferred charges and other assets	9,595	10,109
Total Assets	108,684	109,697
Current Liabilities:
Securities due within one year	3,031	2,587
Notes payable	3,274	2,241
Energy marketing trade payables	534	597
Accounts payable —
Accounts payable	1,920	2,228
Customer deposits	546	558
Accrued taxes —
Accrued income taxes	125	193
Unrecognized tax benefits	400	385
Other accrued taxes	490	667
Accrued interest	508	518
Accrued compensation	584	915
Asset retirement obligations, current	300	378
Liabilities from risk management activities, net of collateral	71	107
Acquisitions payable	0	489
Other regulatory liabilities, current	169	236
Other current liabilities	799	818
Total current liabilities	12,751	12,917
Long-term Debt	43,885	42,629
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	13,529	14,092
Deferred credits related to income taxes	212	219
Accumulated deferred ITCs	2,301	2,228
Employee benefit obligations	2,156	2,299
Asset retirement obligations, deferred	4,297	4,136
Accrued environmental remediation	399	397
Other cost of removal obligations	2,706	2,748
Other regulatory liabilities, deferred	233	258
Other deferred credits and liabilities	805	880
Total deferred credits and other liabilities	26,638	27,257
Total Liabilities	83,274	82,803
Redeemable Preferred Stock of Subsidiaries	118	118
Redeemable Noncontrolling Interests	51	164
Common Stockholders' Equity:
Par value	4,997	4,952
Paid-in capital	10,106	9,661
Treasury, at cost	(34)	(31)
Retained earnings (accumulated deficit)	8,494	10,356
Accumulated other comprehensive loss	(191)	(180)
Total Common Stockholders' Equity	23,372	24,758
Preferred and Preference Stock of Subsidiaries	462	609
Noncontrolling Interests	1,407	1,245
Total Stockholders' Equity	25,241	26,612
Total Liabilities and Stockholders' Equity	108,684	109,697
ALABAMA POWER CO
Current Assets:
Cash and cash equivalents	639	420
Receivables —
Customer accounts receivable	357	348
Unbilled revenues	161	146
Other accounts and notes receivable	36	27
Affiliated	33	40
Accumulated provision for uncollectible accounts	(9)	(10)
Materials and supplies	443	435
Fossil fuel for generation	191	205
Prepaid expenses	86	34
Other regulatory assets, current	135	149
Other current assets	7	11
Total current assets	2,079	1,805
Property, Plant, and Equipment:
In service	26,466	26,031
Less: Accumulated depreciation	9,354	9,112
Plant in service, net of depreciation	17,112	16,919
Nuclear fuel, at amortized cost	333	336
Construction work in progress	668	491
Total property, plant, and equipment	18,113	17,746
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	67	66
Nuclear decommissioning trusts, at fair value	848	792
Miscellaneous property and investments	119	112
Total other property and investments	1,034	970
Deferred Charges and Other Assets:
Deferred charges related to income taxes	526	525
Deferred under recovered regulatory clause revenues	6	150
Other regulatory assets, deferred	1,209	1,157
Other deferred charges and assets	166	163
Total deferred charges and other assets	1,907	1,995
Total Assets	23,133	22,516
Current Liabilities:
Securities due within one year	361	561
Accounts payable —
Affiliated	242	297
Other	317	433
Customer deposits	91	88
Accrued taxes —
Accrued income taxes	39	45
Other accrued taxes	97	42
Accrued interest	81	78
Accrued compensation	125	193
Other regulatory liabilities, current	15	85
Other current liabilities	63	76
Total current liabilities	1,431	1,898
Long-term Debt	7,082	6,535
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	4,842	4,654
Deferred credits related to income taxes	64	65
Accumulated deferred ITCs	113	110
Employee benefit obligations	269	300
Asset retirement obligations, deferred	1,543	1,503
Other cost of removal obligations	648	684
Other regulatory liabilities, deferred	84	100
Other deferred credits and liabilities	69	63
Total deferred credits and other liabilities	7,632	7,479
Total Liabilities	16,145	15,912
Redeemable Preferred Stock	85	85
Preference Stock	196	196
Common Stockholders' Equity:
Par value	1,222	1,222
Paid-in capital	2,950	2,613
Retained earnings (accumulated deficit)	2,564	2,518
Accumulated other comprehensive loss	(29)	(30)
Total Common Stockholders' Equity	6,707	6,323
Total Liabilities and Stockholders' Equity	23,133	22,516
GEORGIA POWER CO
Current Assets:
Cash and cash equivalents	91	3
Receivables —
Customer accounts receivable	565	523
Unbilled revenues	251	224
Joint owner accounts receivable	199	57
Other accounts and notes receivable	62	81
Affiliated	22	18
Accumulated provision for uncollectible accounts	(3)	(3)
Materials and supplies	477	479
Fossil fuel for generation	330	298
Prepaid expenses	55	105
Other regulatory assets, current	193	193
Other current assets	22	38
Total current assets	2,264	2,016
Property, Plant, and Equipment:
In service	34,410	33,841
Less: Accumulated depreciation	11,502	11,317
Plant in service, net of depreciation	22,908	22,524
Nuclear fuel, at amortized cost	559	569
Construction work in progress	5,422	4,939
Total property, plant, and equipment	28,889	28,032
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	56	60
Nuclear decommissioning trusts, at fair value	874	814
Miscellaneous property and investments	51	46
Total other property and investments	981	920
Deferred Charges and Other Assets:
Deferred charges related to income taxes	675	676
Other regulatory assets, deferred	2,790	2,774
Other deferred charges and assets	589	417
Total deferred charges and other assets	4,054	3,867
Total Assets	36,188	34,835
Current Liabilities:
Securities due within one year	261	460
Notes payable	1,228	391
Accounts payable —
Affiliated	367	438
Other	657	589
Customer deposits	269	265
Accrued taxes —
Accrued income taxes	212	407
Accrued interest	115	106
Accrued compensation	141	224
Asset retirement obligations, current	251	299
Other current liabilities	185	297
Total current liabilities	3,686	3,476
Long-term Debt	10,793	10,225
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	6,163	6,000
Deferred credits related to income taxes	118	121
Accumulated deferred ITCs	251	256
Employee benefit obligations	652	703
Asset retirement obligations, deferred	2,340	2,233
Other deferred credits and liabilities	206	199
Total deferred credits and other liabilities	9,730	9,512
Total Liabilities	24,209	23,213
Redeemable Preferred Stock	45	45
Preference Stock	221	221
Common Stockholders' Equity:
Par value	398	398
Paid-in capital	7,274	6,885
Retained earnings (accumulated deficit)	4,052	4,086
Accumulated other comprehensive loss	(11)	(13)
Total Common Stockholders' Equity	11,713	11,356
Total Liabilities and Stockholders' Equity	36,188	34,835
GULF POWER CO
Current Assets:
Cash and cash equivalents	45	56
Receivables —
Customer accounts receivable	77	72
Unbilled revenues	70	55
Under recovered regulatory clause revenues	26	17
Other accounts and notes receivable	11	6
Affiliated	8	17
Accumulated provision for uncollectible accounts	(1)	(1)
Materials and supplies	57	55
Fossil fuel for generation	67	71
Other regulatory assets, current	55	44
Other current assets	17	30
Total current assets	432	422
Property, Plant, and Equipment:
In service	5,156	5,140
Less: Accumulated depreciation	1,427	1,382
Plant in service, net of depreciation	3,729	3,758
Construction work in progress	59	51
Total property, plant, and equipment	3,788	3,809
Deferred Charges and Other Assets:
Deferred charges related to income taxes	57	58
Other regulatory assets, deferred	510	512
Other deferred charges and assets	22	21
Total deferred charges and other assets	589	591
Total Assets	4,809	4,822
Current Liabilities:
Securities due within one year	27	87
Notes payable	78	268
Accounts payable —
Affiliated	52	59
Other	46	54
Customer deposits	35	35
Accrued taxes —
Other accrued taxes	27	20
Accrued interest	9	8
Accrued compensation	23	40
Deferred capacity expense, current	22	22
Other regulatory liabilities, current	0	16
Other current liabilities	43	40
Total current liabilities	362	649
Long-term Debt	1,265	987
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	966	948
Employee benefit obligations	92	96
Deferred capacity expense	108	119
Asset retirement obligations, deferred	125	120
Other cost of removal obligations	218	249
Other regulatory liabilities, deferred	46	47
Other deferred credits and liabilities	74	71
Total deferred credits and other liabilities	1,629	1,650
Total Liabilities	3,256	3,286
Preference Stock	0	147
Common Stockholders' Equity:
Par value	678	503
Paid-in capital	596	589
Retained earnings (accumulated deficit)	280	296
Accumulated other comprehensive loss	(1)	1
Total Common Stockholders' Equity	1,553	1,389
Total Liabilities and Stockholders' Equity	4,809	4,822
MISSISSIPPI POWER CO
Current Assets:
Cash and cash equivalents	140	224
Receivables —
Customer accounts receivable	33	29
Unbilled revenues	42	42
Income taxes receivable, current	544	544
Other accounts and notes receivable	25	14
Affiliated	20	15
Materials and supplies	44	76
Fossil fuel for generation	20	100
Other regulatory assets, current	114	115
Other current assets	2	8
Total current assets	984	1,167
Property, Plant, and Equipment:
In service	4,826	4,865
Less: Accumulated depreciation	1,283	1,289
Plant in service, net of depreciation	3,543	3,576
Construction work in progress	56	2,545
Total property, plant, and equipment	3,599	6,121
Other Property and Investments:
Total other property and investments	22	12
Deferred Charges and Other Assets:
Deferred charges related to income taxes	61	361
Other regulatory assets, deferred	441	518
Accumulated deferred income taxes	404	0
Other deferred charges and assets	20	56
Total deferred charges and other assets	926	935
Total Assets	5,531	8,235
Current Liabilities:
Securities due within one year - parent	0	551
Securities due within one year	1,028	78
Notes payable	17	23
Accounts payable —
Affiliated	54	62
Other	109	135
Customer deposits	16	16
Accrued taxes —
Unrecognized tax benefits	385	383
Other accrued taxes	97	99
Accrued interest	52	46
Accrued compensation	25	42
Asset retirement obligations, current	21	32
Over recovered regulatory clause liabilities	21	51
Other current liabilities	89	20
Total current liabilities	1,914	1,538
Long-term Debt	1,169	2,424
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	0	756
Employee benefit obligations	111	115
Asset retirement obligations, deferred	149	146
Other cost of removal obligations	173	170
Other regulatory liabilities, deferred	80	84
Other deferred credits and liabilities	29	26
Total deferred credits and other liabilities	542	1,297
Total Liabilities	3,625	5,259
Redeemable Preferred Stock	33	33
Common Stockholders' Equity:
Par value	38	38
Paid-in capital	4,527	3,525
Retained earnings (accumulated deficit)	(2,689)	(616)
Accumulated other comprehensive loss	(3)	(4)
Total Common Stockholders' Equity	1,873	2,943
Total Liabilities and Stockholders' Equity	5,531	8,235
SOUTHERN POWER CO
Current Assets:
Cash and cash equivalents	99	1,099
Receivables —
Customer accounts receivable	158	102
Other accounts and notes receivable	37	34
Affiliated	65	57
Materials and supplies	349	337
Fossil fuel for generation	15	15
Prepaid income taxes	41	74
Other current assets	26	39
Total current assets	790	1,757
Property, Plant, and Equipment:
In service	13,731	12,728
Less: Accumulated depreciation	1,689	1,484
Plant in service, net of depreciation	12,042	11,244
Construction work in progress	344	398
Total property, plant, and equipment	12,386	11,642
Other Property and Investments:
Goodwill	2	2
Intangible assets, net (including goodwill)	423	436
Total other property and investments	423	436
Deferred Charges and Other Assets:
Prepaid LTSAs	61	101
Accumulated deferred income taxes	536	594
Income Taxes Receivable, Noncurrent	69	11
Other deferred charges and assets — affiliated	28	13
Other deferred charges and assets	410	615
Total deferred charges and other assets	1,104	1,334
Total Assets	14,703	15,169
Current Liabilities:
Securities due within one year	909	560
Notes payable	398	209
Accounts payable —
Affiliated	68	88
Other	93	278
Accrued taxes —
Accrued income taxes	35	148
Other accrued taxes	21	7
Accrued interest	25	36
Acquisitions payable	0	461
Contingent consideration	11	46
Other current liabilities	67	70
Total current liabilities	1,627	1,903
Long-term Debt	4,816	5,068
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	174	152
Accumulated deferred ITCs	1,914	1,839
Asset retirement obligations, deferred	69	64
Other deferred credits and liabilities	238	304
Total deferred credits and other liabilities	2,395	2,359
Total Liabilities	8,838	9,330
Redeemable Noncontrolling Interests	51	164
Common Stockholders' Equity:
Par value	0	0
Paid-in capital	3,671	3,671
Retained earnings (accumulated deficit)	717	724
Accumulated other comprehensive loss	19	35
Total Common Stockholders' Equity	4,407	4,430
Noncontrolling interests	1,407	1,245
Total Stockholders' Equity	5,814	5,675
Total Liabilities and Stockholders' Equity	14,703	15,169
SOUTHERN Co GAS
Current Assets:
Cash and cash equivalents	38	19
Receivables —
Customer accounts receivable	270	364
Energy marketing receivables	482	623
Unbilled revenues	69	239
Other accounts and notes receivable	63	76
Accumulated provision for uncollectible accounts	(35)	(27)
Materials and supplies	24	26
Natural gas for sale	477	631
Prepaid expenses	69	80
Assets from risk management activities, net of collateral	114	128
Other regulatory assets, current	72	81
Other current assets	20	10
Total current assets	1,663	2,250
Property, Plant, and Equipment:
In service	14,850	14,508
Less: Accumulated depreciation	4,550	4,439
Plant in service, net of depreciation	10,300	10,069
Construction work in progress	779	496
Total property, plant, and equipment	11,079	10,565
Other Property and Investments:
Goodwill	5,967	5,967
Equity investments in unconsolidated subsidiaries	1,610	1,541
Other intangible assets, net of amortization	320	366
Miscellaneous property and investments	21	21
Total other property and investments	7,918	7,895
Deferred Charges and Other Assets:
Other regulatory assets, deferred	963	973
Other deferred charges and assets	186	170
Total deferred charges and other assets	1,149	1,143
Total Assets	21,809	21,853
Current Liabilities:
Securities due within one year	22	22
Notes payable	626	1,257
Energy marketing trade payables	534	597
Accounts payable —
Accounts payable	327	348
Customer deposits	134	153
Accrued taxes —
Accrued income taxes	23	26
Other accrued taxes	63	68
Accrued interest	50	48
Accrued compensation	45	58
Liabilities from risk management activities, net of collateral	20	62
Other regulatory liabilities, current	146	102
Accrued environmental remediation, current	63	69
Temporary LIFO liquidation	69	0
Other current liabilities	113	108
Total current liabilities	2,235	2,918
Long-term Debt	5,677	5,259
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	2,091	1,975
Employee benefit obligations	432	441
Accrued environmental remediation	353	357
Other cost of removal obligations	1,638	1,616
Other regulatory liabilities, deferred	50	51
Other deferred credits and liabilities	91	127
Total deferred credits and other liabilities	4,655	4,567
Total Liabilities	12,567	12,744
Common Stockholders' Equity:
Par value	0	0
Paid-in capital	9,164	9,095
Retained earnings (accumulated deficit)	55	(12)
Accumulated other comprehensive loss	23	26
Total Stockholders' Equity	9,242	9,109
Total Liabilities and Stockholders' Equity	$ 21,809	$ 21,853