Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 2,284	$ 2,130
Receivables —
Customer accounts receivable	1,683	1,806
Energy marketing receivables	448	607
Unbilled revenues	777	810
Under recovered fuel clause revenues	156	171
Other accounts and notes receivable	703	698
Accumulated provision for uncollectible accounts	(54)	(44)
Materials and supplies	1,430	1,438
Fossil fuel for generation	565	594
Natural gas for sale	235	595
Prepaid expenses	432	452
Other regulatory assets, current	579	604
Other current assets	286	211
Total current assets	9,524	10,072
Property, Plant, and Equipment:
In service	104,499	103,542
Less: Accumulated depreciation	31,920	31,457
Plant in service, net of depreciation	72,579	72,085
Nuclear fuel, at amortized cost	908	883
Construction work in progress	7,460	6,904
Total property, plant, and equipment	80,947	79,872
Other Property and Investments:
Goodwill	6,226	6,268
Equity investments in unconsolidated subsidiaries	1,542	1,513
Other intangible assets, net of amortization	848	873
Nuclear decommissioning trusts, at fair value	1,827	1,832
Leveraged leases	781	775
Miscellaneous property and investments	250	249
Total other property and investments	11,474	11,510
Deferred Charges and Other Assets:
Deferred charges related to income taxes	818	825
Unamortized loss on reacquired debt	203	206
Other regulatory assets, deferred	6,948	6,943
Other deferred charges and assets	1,653	1,577
Total deferred charges and other assets	9,622	9,551
Total Assets	111,567	111,005
Current Liabilities:
Securities due within one year	3,235	3,892
Notes payable	4,271	2,439
Energy marketing trade payables	437	546
Accounts payable —
Accounts payable	2,089	2,530
Customer deposits	530	542
Accrued taxes —
Unrecognized tax benefits	0
Accrued taxes	368	636
Accrued interest	432	488
Accrued compensation	493	959
Asset retirement obligations, current	301	351
Other regulatory liabilities, current	551	337
Other current liabilities	923	874
Total current liabilities	13,630	13,594
Long-term Debt	44,446	44,462
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	6,930	6,842
Deferred credits related to income taxes	7,179	7,256
Accumulated deferred ITCs	2,362	2,267
Employee benefit obligations	2,206	2,256
Asset retirement obligations, deferred	4,536	4,473
Accrued environmental remediation	378	389
Other cost of removal obligations	2,667	2,684
Other regulatory liabilities, deferred	224	239
Other deferred credits and liabilities	660	691
Total deferred credits and other liabilities	27,142	27,097
Total Liabilities	85,218	85,153
Redeemable Preferred Stock of Subsidiaries	324	324
Common Stockholders' Equity:
Par value	5,054	5,038
Paid-in capital	10,603	10,469
Treasury, at cost	(38)	(36)
Retained earnings (accumulated deficit)	9,257	8,885
Accumulated other comprehensive income (loss)	(200)	(189)
Total Common Stockholders' Equity	24,676	24,167
Noncontrolling Interests	1,349	1,361
Total Stockholders' Equity	26,025	25,528
Total Liabilities and Stockholders' Equity	111,567	111,005
ALABAMA POWER CO
Current Assets:
Cash and cash equivalents	653	544
Receivables —
Customer accounts receivable	345	355
Unbilled revenues	131	162
Other accounts and notes receivable	36	55
Affiliated	57	43
Accumulated provision for uncollectible accounts	(10)	(9)
Materials and supplies	492	458
Fossil fuel for generation	165	184
Prepaid expenses	133	85
Other regulatory assets, current	131	124
Other current assets	3	5
Total current assets	2,136	2,006
Property, Plant, and Equipment:
In service	27,520	27,326
Less: Accumulated depreciation	9,693	9,563
Plant in service, net of depreciation	17,827	17,763
Nuclear fuel, at amortized cost	358	339
Construction work in progress	1,126	908
Total property, plant, and equipment	19,311	19,010
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	66	67
Nuclear decommissioning trusts, at fair value	897	903
Miscellaneous property and investments	123	124
Total other property and investments	1,086	1,094
Deferred Charges and Other Assets:
Deferred charges related to income taxes	233	239
Deferred under recovered regulatory clause revenues	101	54
Other regulatory assets, deferred	1,257	1,272
Other deferred charges and assets	193	189
Total deferred charges and other assets	1,784	1,754
Total Assets	24,317	23,864
Current Liabilities:
Securities due within one year	200	0
Notes payable	248	3
Accounts payable —
Affiliated	251	327
Other	398	585
Customer deposits	94	92
Accrued taxes —
Accrued taxes	77	54
Accrued interest	65	77
Accrued compensation	96	205
Other regulatory liabilities, current	59	1
Other current liabilities	57	56
Total current liabilities	1,545	1,400
Long-term Debt	7,429	7,628
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	2,792	2,760
Deferred credits related to income taxes	2,067	2,082
Accumulated deferred ITCs	111	112
Employee benefit obligations	297	304
Asset retirement obligations, deferred	1,709	1,702
Other cost of removal obligations	596	609
Other regulatory liabilities, deferred	75	84
Other deferred credits and liabilities	70	63
Total deferred credits and other liabilities	7,717	7,716
Total Liabilities	16,691	16,744
Redeemable Preferred Stock	291	291
Common Stockholders' Equity:
Par value	1,222	1,222
Paid-in capital	3,474	2,986
Retained earnings (accumulated deficit)	2,670	2,647
Accumulated other comprehensive income (loss)	(31)	(26)
Total Common Stockholders' Equity	7,335	6,829
Total Liabilities and Stockholders' Equity	24,317	23,864
GEORGIA POWER CO
Current Assets:
Cash and cash equivalents	1,158	852
Receivables —
Customer accounts receivable	471	544
Unbilled revenues	189	255
Under recovered fuel clause revenues	156	165
Joint owner accounts receivable	226	262
Other accounts and notes receivable	77	76
Affiliated	24	24
Accumulated provision for uncollectible accounts	(2)	(3)
Materials and supplies	499	504
Fossil fuel for generation	290	314
Prepaid expenses	117	216
Other regulatory assets, current	198	205
Other current assets	39	14
Total current assets	3,442	3,428
Property, Plant, and Equipment:
In service	35,177	34,861
Less: Accumulated depreciation	11,818	11,704
Plant in service, net of depreciation	23,359	23,157
Nuclear fuel, at amortized cost	550	544
Construction work in progress	4,800	4,613
Total property, plant, and equipment	28,709	28,314
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	52	53
Nuclear decommissioning trusts, at fair value	930	929
Miscellaneous property and investments	59	59
Total other property and investments	1,041	1,041
Deferred Charges and Other Assets:
Deferred charges related to income taxes	517	516
Other regulatory assets, deferred	2,940	2,932
Other deferred charges and assets	550	548
Total deferred charges and other assets	4,007	3,996
Total Assets	37,199	36,779
Current Liabilities:
Securities due within one year	757	857
Notes payable	0	150
Accounts payable —
Affiliated	349	493
Other	742	834
Customer deposits	273	270
Accrued taxes —
Accrued income taxes	129	344
Accrued interest	110	123
Accrued compensation	110	219
Asset retirement obligations, current	213	270
Other regulatory liabilities, current	232	191
Other current liabilities	215	198
Total current liabilities	3,130	3,949
Long-term Debt	10,797	11,073
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,140	3,175
Deferred credits related to income taxes	3,219	3,248
Accumulated deferred ITCs	269	248
Employee benefit obligations	651	659
Asset retirement obligations, deferred	2,425	2,368
Other deferred credits and liabilities	148	128
Total deferred credits and other liabilities	9,852	9,826
Total Liabilities	23,779	24,848
Common Stockholders' Equity:
Par value	398	398
Paid-in capital	8,805	7,328
Retained earnings (accumulated deficit)	4,228	4,215
Accumulated other comprehensive income (loss)	(11)	(10)
Total Common Stockholders' Equity	13,420	11,931
Total Liabilities and Stockholders' Equity	37,199	36,779
GULF POWER CO
Current Assets:
Cash and cash equivalents	39	28
Receivables —
Customer accounts receivable	72	76
Unbilled revenues	53	67
Under recovered fuel clause revenues	10	27
Other accounts and notes receivable	5	7
Affiliated	6	14
Accumulated provision for uncollectible accounts	(1)	(1)
Materials and supplies	59	57
Fossil fuel for generation	77	63
Other regulatory assets, current	53	56
Other current assets	12	21
Total current assets	385	415
Property, Plant, and Equipment:
In service	5,227	5,196
Less: Accumulated depreciation	1,494	1,461
Plant in service, net of depreciation	3,733	3,735
Construction work in progress	123	91
Total property, plant, and equipment	3,856	3,826
Deferred Charges and Other Assets:
Deferred charges related to income taxes	30	31
Other regulatory assets, deferred	493	502
Other deferred charges and assets	26	23
Total deferred charges and other assets	549	556
Total Assets	4,790	4,797
Current Liabilities:
Notes payable	61	45
Accounts payable —
Affiliated	45	52
Other	66	75
Customer deposits	35	35
Accrued taxes —
Accrued taxes	22	10
Accrued interest	20	9
Accrued compensation	17	39
Deferred capacity expense, current	22	22
Asset retirement obligations, current	39	37
Other regulatory liabilities, current	72	0
Other current liabilities	26	27
Total current liabilities	425	351
Long-term Debt	1,285	1,285
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	536	537
Deferred credits related to income taxes	386	458
Employee benefit obligations	100	102
Deferred capacity expense	92	97
Asset retirement obligations, deferred	105	105
Other cost of removal obligations	215	221
Other regulatory liabilities, deferred	42	43
Other deferred credits and liabilities	68	67
Total deferred credits and other liabilities	1,544	1,630
Total Liabilities	3,254	3,266
Common Stockholders' Equity:
Par value	678	678
Paid-in capital	597	594
Retained earnings (accumulated deficit)	262	259
Accumulated other comprehensive income (loss)	(1)	0
Total Common Stockholders' Equity	1,536	1,531
Total Liabilities and Stockholders' Equity	4,790	4,797
MISSISSIPPI POWER CO
Current Assets:
Cash and cash equivalents	125	248
Receivables —
Customer accounts receivable	26	36
Unbilled revenues	35	41
Income taxes receivable, current	144	4
Other accounts and notes receivable	9	12
Affiliated	25	16
Materials and supplies	51	44
Fossil fuel for generation	21	17
Other regulatory assets, current	123	125
Other current assets	2	9
Total current assets	561	552
Property, Plant, and Equipment:
In service	4,780	4,773
Less: Accumulated depreciation	1,344	1,325
Plant in service, net of depreciation	3,436	3,448
Construction work in progress	93	84
Total property, plant, and equipment	3,529	3,532
Other Property and Investments:
Total other property and investments	30	30
Deferred Charges and Other Assets:
Deferred charges related to income taxes	35	35
Other regulatory assets, deferred	449	437
Accumulated deferred income taxes	98	247
Other deferred charges and assets	10	33
Total deferred charges and other assets	592	752
Total Assets	4,712	4,866
Current Liabilities:
Securities due within one year	214	989
Notes payable	300	4
Accounts payable —
Affiliated	47	59
Other	78	96
Accrued taxes —
Accrued income taxes	0	40
Accrued taxes	31	101
Accrued compensation	18	39
Accrued plant closure costs	61	35
Asset retirement obligations, current	36	37
Other current liabilities	67	63
Total current liabilities	852	1,463
Long-term Debt	1,567	1,097
Deferred Credits and Other Liabilities:
Deferred credits related to income taxes	391	372
Employee benefit obligations	115	116
Asset retirement obligations, deferred	134	137
Other cost of removal obligations	177	178
Other regulatory liabilities, deferred	78	79
Other deferred credits and liabilities	14	33
Total deferred credits and other liabilities	909	915
Total Liabilities	3,328	3,475
Redeemable Preferred Stock	33	33
Common Stockholders' Equity:
Par value	38	38
Paid-in capital	4,531	4,529
Retained earnings (accumulated deficit)	(3,213)	(3,205)
Accumulated other comprehensive income (loss)	(5)	(4)
Total Common Stockholders' Equity	1,351	1,358
Total Liabilities and Stockholders' Equity	4,712	4,866
SOUTHERN POWER CO
Current Assets:
Cash and cash equivalents	82	129
Receivables —
Customer accounts receivable	126	117
Other accounts and notes receivable	69	98
Affiliated	28	50
Materials and supplies	218	278
Prepaid income taxes	82	50
Other current assets	35	36
Total current assets	640	758
Property, Plant, and Equipment:
In service	13,803	13,755
Less: Accumulated depreciation	1,989	1,910
Plant in service, net of depreciation	11,814	11,845
Construction work in progress	634	511
Total property, plant, and equipment	12,448	12,356
Other Property and Investments:
Goodwill	2	2
Intangible assets, net (including goodwill)	404	411
Total other property and investments	404	411
Deferred Charges and Other Assets:
Prepaid LTSAs	103	118
Accumulated deferred income taxes	911	925
Income taxes receivable, non-current	76	72
Other deferred charges and assets	600	566
Total deferred charges and other assets	1,690	1,681
Total Assets	15,182	15,206
Current Liabilities:
Securities due within one year	770	770
Notes payable	134	105
Accounts payable —
Affiliated	56	102
Other	130	103
Accrued taxes —
Other current liabilities	145	152
Total current liabilities	1,235	1,232
Long-term Debt	5,108	5,071
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	142	199
Accumulated deferred ITCs	1,872	1,884
Other deferred credits and liabilities	267	322
Total deferred credits and other liabilities	2,281	2,405
Total Liabilities	8,624	8,708
Common Stockholders' Equity:
Par value	0	0
Paid-in capital	3,663	3,662
Retained earnings (accumulated deficit)	1,519	1,478
Accumulated other comprehensive income (loss)	27	(2)
Total Common Stockholders' Equity	5,209	5,138
Noncontrolling interests	1,349	1,360
Total Stockholders' Equity	6,558	6,498
Total Liabilities and Stockholders' Equity	15,182	15,206
SOUTHERN Co GAS
Current Assets:
Cash and cash equivalents	94	73
Receivables —
Customer accounts receivable	509	400
Energy marketing receivables	448	607
Unbilled revenues	210	285
Other accounts and notes receivable	51	103
Accumulated provision for uncollectible accounts	(36)	(28)
Natural gas for sale	235	595
Prepaid expenses	66	53
Assets from risk management activities, net of collateral	145	135
Other regulatory assets, current	75	94
Other current assets	51	78
Total current assets	1,848	2,395
Property, Plant, and Equipment:
In service	16,056	15,833
Less: Accumulated depreciation	4,670	4,596
Plant in service, net of depreciation	11,386	11,237
Construction work in progress	511	491
Total property, plant, and equipment	11,897	11,728
Other Property and Investments:
Goodwill	5,925	5,967
Equity investments in unconsolidated subsidiaries	1,504	1,477
Other intangible assets, net of amortization	264	280
Miscellaneous property and investments	20	21
Total other property and investments	7,713	7,745
Deferred Charges and Other Assets:
Other regulatory assets, deferred	878	901
Other deferred charges and assets	232	218
Total deferred charges and other assets	1,110	1,119
Total Assets	22,568	22,987
Current Liabilities:
Securities due within one year	177	157
Notes payable	1,035	1,518
Energy marketing trade payables	437	546
Accounts payable —
Accounts payable	392	446
Customer deposits	112	128
Accrued taxes —
Accrued income taxes	77	40
Accrued taxes	76	78
Accrued interest	65	51
Accrued compensation	55	74
Liabilities from risk management activities, net of collateral	18	69
Other regulatory liabilities, current	179	135
Temporary LIFO liquidation	54	0
Other current liabilities	143	159
Total current liabilities	2,820	3,401
Long-term Debt	5,859	5,891
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	1,104	1,089
Deferred credits related to income taxes	1,083	1,063
Employee benefit obligations	413	415
Accrued environmental remediation	333	342
Other cost of removal obligations	1,650	1,646
Other deferred credits and liabilities	107	118
Total deferred credits and other liabilities	4,690	4,673
Total Liabilities	13,369	13,965
Common Stockholders' Equity:
Par value	0	0
Paid-in capital	9,228	9,214
Retained earnings (accumulated deficit)	(55)	(212)
Accumulated other comprehensive income (loss)	26	20
Total Stockholders' Equity	9,199	9,022
Total Liabilities and Stockholders' Equity	$ 22,568	$ 22,987

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Sum of the carrying amounts as of the balance sheet date of all assets, excluding Property, Plant, and Equipment and Other Property and Investments, that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer.

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Carrying amount of other regulatory assets (not elsewhere identified) as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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Carrying amount at the balance sheet date for long-lived physical assets used in the normal conduct of business and not intended for resale, less depreciation.

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Carrying amount at the balance sheet date of customer accounts receivable for retail and wholesale under recovered fuel costs, and other under recovered regulatory costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled.

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Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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