Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 1,847	$ 2,130
Receivables —
Customer accounts receivable	1,730	1,806
Energy marketing receivables	498	607
Unbilled revenues	738	810
Under recovered fuel clause revenues	105	171
Other accounts and notes receivable	690	698
Accumulated provision for uncollectible accounts	(33)	(44)
Materials and supplies	1,418	1,438
Fossil fuel for generation	390	594
Natural gas for sale	486	595
Prepaid expenses	354	452
Other regulatory assets, current	522	604
Assets held for sale, current	407	12
Other current assets	232	199
Total current assets	9,384	10,072
Property, Plant, and Equipment:
In service	100,672	103,542
Less: Accumulated depreciation	30,739	31,457
Plant in service, net of depreciation	69,933	72,085
Nuclear fuel, at amortized cost	844	883
Construction work in progress	7,655	6,904
Total property, plant, and equipment	78,432	79,872
Other Property and Investments:
Goodwill	5,315	6,268
Equity investments in unconsolidated subsidiaries	1,569	1,513
Other intangible assets, net of amortization	674	873
Nuclear decommissioning trusts, at fair value	1,872	1,832
Leveraged leases	794	775
Miscellaneous property and investments	258	249
Total other property and investments	10,482	11,510
Deferred Charges and Other Assets:
Deferred charges related to income taxes	792	825
Unamortized loss on reacquired debt	328	206
Other regulatory assets, deferred	6,196	6,943
Assets held for sale	4,667	0
Other deferred charges and assets	1,436	1,577
Total deferred charges and other assets	13,419	9,551
Total Assets	111,717	111,005
Current Liabilities:
Securities due within one year	3,013	3,892
Notes payable	2,564	2,439
Energy marketing trade payables	521	546
Accounts payable —
Accounts payable	2,246	2,530
Customer deposits	524	542
Accrued taxes —
Accrued taxes	1,060	636
Accrued interest	422	488
Accrued compensation	800	959
Asset retirement obligations, current	348	351
Other regulatory liabilities, current	349	337
Liabilities held for sale, current	355	0
Other current liabilities	763	874
Total current liabilities	12,965	13,594
Long-term Debt	41,425	44,462
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	6,035	6,842
Deferred credits related to income taxes	6,651	7,256
Accumulated deferred ITCs	2,377	2,267
Employee benefit obligations	2,017	2,256
Asset retirement obligations, deferred	5,817	4,473
Accrued environmental remediation	269	389
Other cost of removal obligations	2,330	2,684
Other regulatory liabilities, deferred	153	239
Liabilities held for sale	2,835	0
Other deferred credits and liabilities	454	691
Total deferred credits and other liabilities	28,938	27,097
Total Liabilities	83,328	85,153
Redeemable Preferred Stock of Subsidiaries	324	324
Common Stockholders' Equity:
Common stock	5,140	5,038
Paid-in capital	10,905	10,469
Treasury, at cost	(39)	(36)
Retained earnings (accumulated deficit)	9,048	8,885
Accumulated other comprehensive income (loss)	(177)	(189)
Total Common Stockholders' Equity	24,877	24,167
Noncontrolling interests	3,188	1,361
Total stockholders' equity	28,065	25,528
Total Liabilities and Stockholders' Equity	111,717	111,005
ALABAMA POWER CO
Current Assets:
Cash and cash equivalents	702	544
Receivables —
Customer accounts receivable	455	355
Unbilled revenues	159	162
Under recovered fuel clause revenues	48	0
Affiliated	68	43
Other accounts and notes receivable	54	55
Accumulated provision for uncollectible accounts	(9)	(9)
Materials and supplies	536	458
Fossil fuel for generation	117	184
Prepaid expenses	59	85
Other regulatory assets, current	141	124
Other current assets	8	5
Total current assets	2,338	2,006
Property, Plant, and Equipment:
In service	29,568	27,326
Less: Accumulated depreciation	9,932	9,563
Plant in service, net of depreciation	19,636	17,763
Nuclear fuel, at amortized cost	316	339
Construction work in progress	1,457	908
Total property, plant, and equipment	21,409	19,010
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	63	67
Nuclear decommissioning trusts, at fair value	938	903
Miscellaneous property and investments	127	124
Total other property and investments	1,128	1,094
Deferred Charges and Other Assets:
Deferred charges related to income taxes	236	239
Deferred under recovered regulatory clause revenues	88	54
Other regulatory assets, deferred	1,209	1,272
Other deferred charges and assets	202	189
Total deferred charges and other assets	1,735	1,754
Total Assets	26,610	23,864
Current Liabilities:
Securities due within one year	321	0
Accounts payable —
Affiliated	341	327
Other	425	585
Customer deposits	96	92
Accrued taxes —
Accrued income taxes	97	9
Other accrued taxes	132	45
Accrued interest	81	77
Accrued compensation	169	205
Asset retirement obligations, current	111	7
Other regulatory liabilities, current	57	1
Other current liabilities	46	52
Total current liabilities	1,876	1,400
Long-term Debt	7,803	7,628
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	2,882	2,760
Deferred credits related to income taxes	2,051	2,082
Accumulated deferred ITCs	107	112
Employee benefit obligations	283	304
Asset retirement obligations, deferred	3,090	1,702
Other cost of removal obligations	542	609
Other regulatory liabilities, deferred	52	84
Other deferred credits and liabilities	48	63
Total deferred credits and other liabilities	9,055	7,716
Total Liabilities	18,734	16,744
Redeemable Preferred Stock	291	291
Common Stockholders' Equity:
Common stock	1,222	1,222
Paid-in capital	3,490	2,986
Retained earnings (accumulated deficit)	2,902	2,647
Accumulated other comprehensive income (loss)	(29)	(26)
Total Common Stockholders' Equity	7,585	6,829
Total Liabilities and Stockholders' Equity	26,610	23,864
GEORGIA POWER CO
Current Assets:
Cash and cash equivalents	380	852
Receivables —
Customer accounts receivable	747	544
Unbilled revenues	245	255
Under recovered fuel clause revenues	105	165
Joint owner accounts receivable	208	262
Affiliated	39	24
Other accounts and notes receivable	96	76
Accumulated provision for uncollectible accounts	(3)	(3)
Materials and supplies	494	504
Fossil fuel for generation	244	314
Prepaid expenses	77	216
Other regulatory assets, current	199	205
Other current assets	91	14
Total current assets	2,922	3,428
Property, Plant, and Equipment:
In service	35,671	34,861
Less: Accumulated depreciation	12,029	11,704
Plant in service, net of depreciation	23,642	23,157
Nuclear fuel, at amortized cost	528	544
Construction work in progress	4,655	4,613
Total property, plant, and equipment	28,825	28,314
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	50	53
Nuclear decommissioning trusts, at fair value	933	929
Miscellaneous property and investments	61	59
Total other property and investments	1,044	1,041
Deferred Charges and Other Assets:
Deferred charges related to income taxes	519	516
Other regulatory assets, deferred	3,041	2,932
Other deferred charges and assets	510	548
Total deferred charges and other assets	4,070	3,996
Total Assets	36,861	36,779
Current Liabilities:
Securities due within one year	511	857
Notes payable	102	150
Accounts payable —
Affiliated	515	493
Other	909	834
Customer deposits	275	270
Accrued taxes —
Accrued taxes	345	344
Accrued interest	108	123
Accrued compensation	185	219
Asset retirement obligations, current	193	270
Other regulatory liabilities, current	151	191
Other current liabilities	180	198
Total current liabilities	3,474	3,949
Long-term Debt	9,863	11,073
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	2,999	3,175
Deferred credits related to income taxes	3,218	3,248
Accumulated deferred ITCs	264	248
Employee benefit obligations	650	659
Asset retirement obligations, deferred	2,401	2,368
Other deferred credits and liabilities	141	128
Total deferred credits and other liabilities	9,673	9,826
Total Liabilities	23,010	24,848
Common Stockholders' Equity:
Common stock	398	398
Paid-in capital	9,670	7,328
Retained earnings (accumulated deficit)	3,792	4,215
Accumulated other comprehensive income (loss)	(9)	(10)
Total Common Stockholders' Equity	13,851	11,931
Total Liabilities and Stockholders' Equity	36,861	36,779
GULF POWER CO
Current Assets:
Cash and cash equivalents	37	28
Receivables —
Customer accounts receivable	100	76
Unbilled revenues	69	67
Under recovered fuel clause revenues	0	27
Affiliated	20	14
Other accounts and notes receivable	5	7
Accumulated provision for uncollectible accounts	(1)	(1)
Materials and supplies	61	57
Fossil fuel for generation	58	63
Other regulatory assets, current	47	56
Other current assets	13	21
Total current assets	409	415
Property, Plant, and Equipment:
In service	5,313	5,196
Less: Accumulated depreciation	1,540	1,461
Plant in service, net of depreciation	3,773	3,735
Construction work in progress	152	91
Total property, plant, and equipment	3,925	3,826
Deferred Charges and Other Assets:
Deferred charges related to income taxes	30	31
Other regulatory assets, deferred	495	502
Other deferred charges and assets	46	23
Total deferred charges and other assets	571	556
Total Assets	4,905	4,797
Current Liabilities:
Notes payable	50	45
Accounts payable —
Affiliated	64	52
Other	67	75
Customer deposits	35	35
Accrued taxes —
Accrued taxes	45	10
Accrued interest	20	9
Accrued compensation	30	39
Deferred capacity expense, current	22	22
Asset retirement obligations, current	43	37
Other regulatory liabilities, current	69	0
Other current liabilities	20	27
Total current liabilities	465	351
Long-term Debt	1,285	1,285
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	542	537
Deferred credits related to income taxes	380	458
Employee benefit obligations	96	102
Deferred capacity expense	81	97
Asset retirement obligations, deferred	121	105
Other cost of removal obligations	218	221
Other regulatory liabilities, deferred	51	43
Other deferred credits and liabilities	62	67
Total deferred credits and other liabilities	1,551	1,630
Total Liabilities	3,301	3,266
Common Stockholders' Equity:
Common stock	678	678
Paid-in capital	636	594
Retained earnings (accumulated deficit)	291	259
Accumulated other comprehensive income (loss)	(1)	0
Total Common Stockholders' Equity	1,604	1,531
Total Liabilities and Stockholders' Equity	4,905	4,797
MISSISSIPPI POWER CO
Current Assets:
Cash and cash equivalents	379	248
Receivables —
Customer accounts receivable	49	36
Unbilled revenues	43	41
Income taxes receivable, current	3	4
Affiliated	35	16
Other accounts and notes receivable	47	12
Materials and supplies	52	44
Fossil fuel for generation	19	17
Other regulatory assets, current	110	125
Other current assets	4	9
Total current assets	741	552
Property, Plant, and Equipment:
In service	4,819	4,773
Less: Accumulated depreciation	1,389	1,325
Plant in service, net of depreciation	3,430	3,448
Construction work in progress	106	84
Total property, plant, and equipment	3,536	3,532
Other Property and Investments:
Total other property and investments	24	30
Deferred Charges and Other Assets:
Deferred charges related to income taxes	34	35
Other regulatory assets, deferred	466	437
Accumulated deferred income taxes	0	247
Other deferred charges and assets	16	33
Total deferred charges and other assets	516	752
Total Assets	4,817	4,866
Current Liabilities:
Securities due within one year	204	989
Notes payable	0	4
Accounts payable —
Affiliated	55	59
Other	90	96
Accrued taxes —
Accrued income taxes	75	40
Other accrued taxes	74	101
Accrued interest	21	16
Accrued compensation	30	39
Accrued plant closure costs	30	35
Asset retirement obligations, current	41	37
Other current liabilities	56	47
Total current liabilities	676	1,463
Long-term Debt	1,532	1,097
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	193	0
Deferred credits related to income taxes	420	372
Employee benefit obligations	111	116
Asset retirement obligations, deferred	136	137
Other cost of removal obligations	181	178
Other regulatory liabilities, deferred	75	79
Other deferred credits and liabilities	17	33
Total deferred credits and other liabilities	1,133	915
Total Liabilities	3,341	3,475
Redeemable Preferred Stock	33	33
Common Stockholders' Equity:
Common stock	38	38
Paid-in capital	4,528	4,529
Retained earnings (accumulated deficit)	(3,119)	(3,205)
Accumulated other comprehensive income (loss)	(4)	(4)
Total Common Stockholders' Equity	1,443	1,358
Total Liabilities and Stockholders' Equity	4,817	4,866
SOUTHERN POWER CO
Current Assets:
Cash and cash equivalents	192	129
Receivables —
Customer accounts receivable	150	117
Affiliated	71	50
Other accounts and notes receivable	62	98
Materials and supplies	214	278
Prepaid income taxes	44	50
Assets held for sale, current	18	1
Other current assets	29	35
Total current assets	780	758
Property, Plant, and Equipment:
In service	13,603	13,755
Less: Accumulated depreciation	2,087	1,910
Plant in service, net of depreciation	11,516	11,845
Construction work in progress	586	511
Total property, plant, and equipment	12,102	12,356
Other Property and Investments:
Intangible assets, net of amortization	391	411
Total other property and investments	391	411
Deferred Charges and Other Assets:
Prepaid LTSAs	106	118
Accumulated deferred income taxes	1,281	925
Income taxes receivable, non-current	84	72
Assets held for sale	185	0
Other deferred charges and assets	426	566
Total deferred charges and other assets	2,082	1,681
Total Assets	15,355	15,206
Current Liabilities:
Securities due within one year	0	770
Notes payable	237	105
Accounts payable —
Affiliated	86	102
Other	88	103
Accrued taxes —
Accrued income taxes	233	0
Liabilities held for sale, current	4	0
Other current liabilities	165	152
Total current liabilities	813	1,232
Long-term Debt	5,029	5,071
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	111	199
Accumulated deferred ITCs	1,842	1,884
Other deferred credits and liabilities	259	322
Total deferred credits and other liabilities	2,212	2,405
Total Liabilities	8,054	8,708
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	2,604	3,662
Retained earnings (accumulated deficit)	1,478	1,478
Accumulated other comprehensive income (loss)	31	(2)
Total Common Stockholders' Equity	4,113	5,138
Noncontrolling interests	3,188	1,360
Total stockholders' equity	7,301	6,498
Total Liabilities and Stockholders' Equity	15,355	15,206
SOUTHERN Co GAS
Current Assets:
Cash and cash equivalents	56	73
Receivables —
Customer accounts receivable	180	400
Energy marketing receivables	498	607
Unbilled revenues	58	285
Affiliated	23	12
Other accounts and notes receivable	110	91
Accumulated provision for uncollectible accounts	(18)	(28)
Natural gas for sale	486	595
Prepaid expenses	62	53
Assets from risk management activities, net of collateral	87	135
Other regulatory assets, current	72	94
Other current assets	88	78
Total current assets	1,702	2,395
Property, Plant, and Equipment:
In service	14,771	15,833
Less: Accumulated depreciation	4,351	4,596
Plant in service, net of depreciation	10,420	11,237
Construction work in progress	660	491
Total property, plant, and equipment	11,080	11,728
Other Property and Investments:
Goodwill	5,015	5,967
Equity investments in unconsolidated subsidiaries	1,529	1,477
Other intangible assets, net of amortization	113	280
Miscellaneous property and investments	20	21
Total other property and investments	6,677	7,745
Deferred Charges and Other Assets:
Other regulatory assets, deferred	721	901
Other deferred charges and assets	218	218
Total deferred charges and other assets	939	1,119
Total Assets	20,398	22,987
Current Liabilities:
Securities due within one year	515	157
Notes payable	136	1,518
Energy marketing trade payables	521	546
Accounts payable —
Affiliated	37	21
Other	346	425
Customer deposits	136	128
Accrued taxes —
Accrued income taxes	0	40
Other accrued taxes	61	78
Accrued interest	66	51
Accrued compensation	71	74
Liabilities from risk management activities, net of collateral	28	69
Other regulatory liabilities, current	132	135
Other current liabilities	122	159
Total current liabilities	2,171	3,401
Long-term Debt	5,393	5,891
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	944	1,089
Deferred credits related to income taxes	930	1,063
Employee benefit obligations	412	415
Accrued environmental remediation	269	342
Other cost of removal obligations	1,577	1,646
Other deferred credits and liabilities	79	118
Total deferred credits and other liabilities	4,211	4,673
Total Liabilities	11,775	13,965
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	8,863	9,214
Retained earnings (accumulated deficit)	(273)	(212)
Accumulated other comprehensive income (loss)	33	20
Total Common Stockholders' Equity	8,623	9,022
Total Liabilities and Stockholders' Equity	$ 20,398	$ 22,987