Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 1,980	$ 2,130
Receivables —
Customer accounts receivable	1,728	1,806
Energy marketing receivables	451	607
Unbilled revenues	769	810
Under recovered fuel clause revenues	159	171
Other accounts and notes receivable	621	698
Accumulated provision for uncollectible accounts	(42)	(44)
Materials and supplies	1,397	1,438
Fossil fuel for generation	462	594
Natural gas for sale	292	595
Prepaid expenses	398	452
Other regulatory assets, current	528	604
Assets held for sale, current	2,704	12
Other current assets	172	199
Total current assets	11,619	10,072
Property, Plant, and Equipment:
In service	99,626	103,542
Less: Accumulated depreciation	30,255	31,457
Plant in service, net of depreciation	69,371	72,085
Nuclear fuel, at amortized cost	874	883
Construction work in progress	6,947	6,904
Total property, plant, and equipment	77,192	79,872
Other Property and Investments:
Goodwill	5,315	6,268
Equity investments in unconsolidated subsidiaries	1,546	1,513
Other intangible assets, net of amortization	702	873
Nuclear decommissioning trusts, at fair value	1,829	1,832
Leveraged leases	788	775
Miscellaneous property and investments	247	249
Total other property and investments	10,427	11,510
Deferred Charges and Other Assets:
Deferred charges related to income taxes	789	825
Unamortized loss on reacquired debt	333	206
Other regulatory assets, deferred	6,302	6,943
Assets held for sale	4,618	0
Other deferred charges and assets	1,497	1,577
Total deferred charges and other assets	13,539	9,551
Total Assets	112,777	111,005
Current Liabilities:
Securities due within one year	2,237	3,892
Notes payable	4,981	2,439
Energy marketing trade payables	485	546
Accounts payable —
Accounts payable	2,162	2,530
Customer deposits	488	542
Accrued taxes —
Accrued taxes	544	636
Accrued interest	469	488
Accrued compensation	646	959
Asset retirement obligations, current	332	351
Other regulatory liabilities, current	508	337
Liabilities held for sale, current	706	0
Other current liabilities	808	874
Total current liabilities	14,366	13,594
Long-term Debt	42,483	44,462
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	5,934	6,842
Deferred credits related to income taxes	6,647	7,256
Accumulated deferred ITCs	2,360	2,267
Employee benefit obligations	2,009	2,256
Asset retirement obligations, deferred	5,836	4,473
Accrued environmental remediation	273	389
Other cost of removal obligations	2,364	2,684
Other regulatory liabilities, deferred	140	239
Liabilities held for sale	2,833	0
Other deferred credits and liabilities	516	691
Total deferred credits and other liabilities	28,912	27,097
Total Liabilities	85,761	85,153
Redeemable Preferred Stock of Subsidiaries	324	324
Common Stockholders' Equity:
Common stock	5,066	5,038
Paid-in capital	10,303	10,469
Treasury, at cost	(39)	(36)
Retained earnings (accumulated deficit)	8,494	8,885
Accumulated other comprehensive income (loss)	(188)	(189)
Total Common Stockholders' Equity	23,636	24,167
Noncontrolling interests	3,056	1,361
Total stockholders' equity	26,692	25,528
Total Liabilities and Stockholders' Equity	112,777	111,005
ALABAMA POWER CO
Current Assets:
Cash and cash equivalents	686	544
Receivables —
Customer accounts receivable	401	355
Unbilled revenues	174	162
Under recovered fuel clause revenues	28	0
Other accounts and notes receivable	41	55
Affiliated	54	43
Accumulated provision for uncollectible accounts	(10)	(9)
Materials and supplies	518	458
Fossil fuel for generation	154	184
Prepaid expenses	90	85
Other regulatory assets, current	146	124
Other current assets	11	5
Total current assets	2,293	2,006
Property, Plant, and Equipment:
In service	29,374	27,326
Less: Accumulated depreciation	9,813	9,563
Plant in service, net of depreciation	19,561	17,763
Nuclear fuel, at amortized cost	337	339
Construction work in progress	1,172	908
Total property, plant, and equipment	21,070	19,010
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	66	67
Nuclear decommissioning trusts, at fair value	906	903
Miscellaneous property and investments	124	124
Total other property and investments	1,096	1,094
Deferred Charges and Other Assets:
Deferred charges related to income taxes	234	239
Deferred under recovered regulatory clause revenues	121	54
Other regulatory assets, deferred	1,244	1,272
Other deferred charges and assets	212	189
Total deferred charges and other assets	1,811	1,754
Total Assets	26,270	23,864
Current Liabilities:
Securities due within one year	200	0
Accounts payable —
Affiliated	298	327
Other	398	585
Customer deposits	95	92
Accrued taxes —
Accrued taxes	137	54
Accrued interest	81	77
Accrued compensation	140	205
Other regulatory liabilities, current	118	1
Other current liabilities	143	59
Total current liabilities	1,610	1,400
Long-term Debt	7,922	7,628
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	2,829	2,760
Deferred credits related to income taxes	2,061	2,082
Accumulated deferred ITCs	109	112
Employee benefit obligations	275	304
Asset retirement obligations, deferred	3,085	1,702
Other cost of removal obligations	580	609
Other regulatory liabilities, deferred	43	84
Other deferred credits and liabilities	64	63
Total deferred credits and other liabilities	9,046	7,716
Total Liabilities	18,578	16,744
Redeemable Preferred Stock	291	291
Common Stockholders' Equity:
Common stock	1,222	1,222
Paid-in capital	3,480	2,986
Retained earnings (accumulated deficit)	2,729	2,647
Accumulated other comprehensive income (loss)	(30)	(26)
Total Common Stockholders' Equity	7,401	6,829
Total Liabilities and Stockholders' Equity	26,270	23,864
GEORGIA POWER CO
Current Assets:
Cash and cash equivalents	11	852
Receivables —
Customer accounts receivable	631	544
Unbilled revenues	276	255
Under recovered fuel clause revenues	159	165
Joint owner accounts receivable	239	262
Other accounts and notes receivable	81	76
Affiliated	25	24
Accumulated provision for uncollectible accounts	(3)	(3)
Materials and supplies	498	504
Fossil fuel for generation	276	314
Prepaid expenses	91	216
Other regulatory assets, current	206	205
Other current assets	23	14
Total current assets	2,513	3,428
Property, Plant, and Equipment:
In service	35,467	34,861
Less: Accumulated depreciation	11,901	11,704
Plant in service, net of depreciation	23,566	23,157
Nuclear fuel, at amortized cost	536	544
Construction work in progress	4,157	4,613
Total property, plant, and equipment	28,259	28,314
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	52	53
Nuclear decommissioning trusts, at fair value	924	929
Miscellaneous property and investments	61	59
Total other property and investments	1,037	1,041
Deferred Charges and Other Assets:
Deferred charges related to income taxes	518	516
Other regulatory assets, deferred	3,064	2,932
Other deferred charges and assets	570	548
Total deferred charges and other assets	4,152	3,996
Total Assets	35,961	36,779
Current Liabilities:
Securities due within one year	509	857
Notes payable	480	150
Accounts payable —
Affiliated	458	493
Other	885	834
Customer deposits	275	270
Accrued taxes —
Accrued taxes	230	344
Accrued interest	110	123
Accrued compensation	149	219
Asset retirement obligations, current	191	270
Other regulatory liabilities, current	214	191
Other current liabilities	205	198
Total current liabilities	3,706	3,949
Long-term Debt	9,936	11,073
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	2,925	3,175
Deferred credits related to income taxes	3,218	3,248
Accumulated deferred ITCs	267	248
Employee benefit obligations	636	659
Asset retirement obligations, deferred	2,427	2,368
Other deferred credits and liabilities	144	128
Total deferred credits and other liabilities	9,617	9,826
Total Liabilities	23,259	24,848
Common Stockholders' Equity:
Common stock	398	398
Paid-in capital	8,834	7,328
Retained earnings (accumulated deficit)	3,480	4,215
Accumulated other comprehensive income (loss)	(10)	(10)
Total Common Stockholders' Equity	12,702	11,931
Total Liabilities and Stockholders' Equity	35,961	36,779
GULF POWER CO
Current Assets:
Cash and cash equivalents	31	28
Receivables —
Customer accounts receivable	87	76
Unbilled revenues	71	67
Under recovered fuel clause revenues	3	27
Other accounts and notes receivable	5	7
Affiliated	15	14
Accumulated provision for uncollectible accounts	(1)	(1)
Materials and supplies	61	57
Fossil fuel for generation	63	63
Other regulatory assets, current	49	56
Other current assets	19	21
Total current assets	403	415
Property, Plant, and Equipment:
In service	5,293	5,196
Less: Accumulated depreciation	1,523	1,461
Plant in service, net of depreciation	3,770	3,735
Construction work in progress	116	91
Total property, plant, and equipment	3,886	3,826
Deferred Charges and Other Assets:
Deferred charges related to income taxes	30	31
Other regulatory assets, deferred	486	502
Other deferred charges and assets	36	23
Total deferred charges and other assets	552	556
Total Assets	4,841	4,797
Current Liabilities:
Notes payable	90	45
Accounts payable —
Affiliated	51	52
Other	57	75
Customer deposits	35	35
Accrued taxes —
Accrued taxes	28	10
Accrued interest	8	9
Accrued compensation	24	39
Deferred capacity expense, current	22	22
Asset retirement obligations, current	39	37
Other regulatory liabilities, current	54	0
Other current liabilities	24	27
Total current liabilities	432	351
Long-term Debt	1,285	1,285
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	540	537
Deferred credits related to income taxes	384	458
Employee benefit obligations	98	102
Deferred capacity expense	86	97
Asset retirement obligations, deferred	109	105
Other cost of removal obligations	216	221
Other regulatory liabilities, deferred	52	43
Other deferred credits and liabilities	64	67
Total deferred credits and other liabilities	1,549	1,630
Total Liabilities	3,266	3,266
Common Stockholders' Equity:
Common stock	678	678
Paid-in capital	632	594
Retained earnings (accumulated deficit)	266	259
Accumulated other comprehensive income (loss)	(1)	0
Total Common Stockholders' Equity	1,575	1,531
Total Liabilities and Stockholders' Equity	4,841	4,797
MISSISSIPPI POWER CO
Current Assets:
Cash and cash equivalents	228	248
Receivables —
Customer accounts receivable	37	36
Unbilled revenues	42	41
Income taxes receivable, current	37	4
Other accounts and notes receivable	24	12
Affiliated	21	16
Materials and supplies	50	44
Fossil fuel for generation	19	17
Other regulatory assets, current	121	125
Other current assets	9	9
Total current assets	588	552
Property, Plant, and Equipment:
In service	4,816	4,773
Less: Accumulated depreciation	1,365	1,325
Plant in service, net of depreciation	3,451	3,448
Construction work in progress	88	84
Total property, plant, and equipment	3,539	3,532
Other Property and Investments:
Total other property and investments	25	30
Deferred Charges and Other Assets:
Deferred charges related to income taxes	34	35
Other regulatory assets, deferred	448	437
Accumulated deferred income taxes	0	247
Other deferred charges and assets	19	33
Total deferred charges and other assets	501	752
Total Assets	4,653	4,866
Current Liabilities:
Securities due within one year	257	989
Notes payable	100	4
Accounts payable —
Affiliated	53	59
Other	62	96
Accrued taxes —
Accrued income taxes	0	40
Accrued taxes	51	101
Accrued compensation	25	39
Accrued plant closure costs	42	35
Asset retirement obligations, current	41	37
Other current liabilities	74	63
Total current liabilities	705	1,463
Long-term Debt	1,522	1,097
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	60	0
Deferred credits related to income taxes	415	372
Employee benefit obligations	112	116
Asset retirement obligations, deferred	135	137
Other cost of removal obligations	179	178
Other regulatory liabilities, deferred	78	79
Other deferred credits and liabilities	16	33
Total deferred credits and other liabilities	995	915
Total Liabilities	3,222	3,475
Redeemable Preferred Stock	33	33
Common Stockholders' Equity:
Common stock	38	38
Paid-in capital	4,531	4,529
Retained earnings (accumulated deficit)	(3,166)	(3,205)
Accumulated other comprehensive income (loss)	(5)	(4)
Total Common Stockholders' Equity	1,398	1,358
Total Liabilities and Stockholders' Equity	4,653	4,866
SOUTHERN POWER CO
Current Assets:
Cash and cash equivalents	142	129
Receivables —
Customer accounts receivable	165	117
Other accounts and notes receivable	63	98
Affiliated	60	50
Materials and supplies	213	278
Prepaid income taxes	82	50
Assets held for sale, current	17	1
Other current assets	31	35
Total current assets	773	758
Property, Plant, and Equipment:
In service	13,402	13,755
Less: Accumulated depreciation	1,959	1,910
Plant in service, net of depreciation	11,443	11,845
Construction work in progress	771	511
Total property, plant, and equipment	12,214	12,356
Other Property and Investments:
Intangible assets, net (including goodwill)	398	411
Total other property and investments	398	411
Deferred Charges and Other Assets:
Prepaid LTSAs	93	118
Accumulated deferred income taxes	1,223	925
Income taxes receivable, non-current	81	72
Assets held for sale	183	0
Other deferred charges and assets	463	566
Total deferred charges and other assets	2,043	1,681
Total Assets	15,428	15,206
Current Liabilities:
Securities due within one year	0	770
Notes payable	264	105
Accounts payable —
Affiliated	75	102
Other	84	103
Accrued taxes —
Liabilities held for sale, current	2	0
Other current liabilities	146	152
Total current liabilities	571	1,232
Long-term Debt	5,037	5,071
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	135	199
Accumulated deferred ITCs	1,856	1,884
Other deferred credits and liabilities	255	322
Total deferred credits and other liabilities	2,246	2,405
Total Liabilities	7,854	8,708
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	3,023	3,662
Retained earnings (accumulated deficit)	1,464	1,478
Accumulated other comprehensive income (loss)	31	(2)
Total Common Stockholders' Equity	4,518	5,138
Noncontrolling interests	3,056	1,360
Total stockholders' equity	7,574	6,498
Total Liabilities and Stockholders' Equity	15,428	15,206
SOUTHERN Co GAS
Current Assets:
Cash and cash equivalents	69	73
Receivables —
Customer accounts receivable	243	400
Energy marketing receivables	451	607
Unbilled revenues	60	285
Other accounts and notes receivable	53	103
Accumulated provision for uncollectible accounts	(26)	(28)
Natural gas for sale	292	595
Prepaid expenses	64	53
Assets from risk management activities, net of collateral	93	135
Other regulatory assets, current	55	94
Assets held for sale, current	2,298	0
Other current assets	42	78
Total current assets	3,694	2,395
Property, Plant, and Equipment:
In service	14,504	15,833
Less: Accumulated depreciation	4,293	4,596
Plant in service, net of depreciation	10,211	11,237
Construction work in progress	571	491
Total property, plant, and equipment	10,782	11,728
Other Property and Investments:
Goodwill	5,015	5,967
Equity investments in unconsolidated subsidiaries	1,507	1,477
Other intangible assets, net of amortization	125	280
Miscellaneous property and investments	20	21
Total other property and investments	6,667	7,745
Deferred Charges and Other Assets:
Other regulatory assets, deferred	742	901
Other deferred charges and assets	227	218
Total deferred charges and other assets	969	1,119
Total Assets	22,112	22,987
Current Liabilities:
Securities due within one year	156	157
Notes payable	1,003	1,518
Energy marketing trade payables	485	546
Accounts payable —
Accounts payable	359	446
Customer deposits	101	128
Accrued taxes —
Accrued income taxes	86	40
Accrued taxes	63	78
Accrued interest	53	51
Accrued compensation	61	74
Liabilities from risk management activities, net of collateral	21	69
Other regulatory liabilities, current	162	135
Liabilities held for sale, current	412	0
Other current liabilities	143	159
Total current liabilities	3,105	3,401
Long-term Debt	5,667	5,891
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	1,026	1,089
Deferred credits related to income taxes	920	1,063
Employee benefit obligations	389	415
Accrued environmental remediation	273	342
Other cost of removal obligations	1,575	1,646
Other deferred credits and liabilities	96	118
Total deferred credits and other liabilities	4,279	4,673
Total Liabilities	13,051	13,965
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	9,236	9,214
Retained earnings (accumulated deficit)	(202)	(212)
Accumulated other comprehensive income (loss)	27	20
Total Common Stockholders' Equity	9,061	9,022
Total Liabilities and Stockholders' Equity	$ 22,112	$ 22,987