Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 682,000,000	$ 628,000,000
Restricted cash and cash equivalents	0	7,000,000
Receivables --
Customer accounts receivable	1,292,000,000	961,000,000
Unbilled revenues	473,000,000	441,000,000
Under recovered regulatory clause revenues	45,000,000	29,000,000
Other accounts and notes receivable	269,000,000	235,000,000
Accumulated provision for uncollectible accounts	(19,000,000)	(17,000,000)
Fossil fuel stock, at average cost	1,349,000,000	1,819,000,000
Materials and supplies, at average cost	959,000,000	1,000,000,000
Vacation pay	164,000,000	165,000,000
Prepaid expenses	418,000,000	657,000,000
Other regulatory assets, current	120,000,000	163,000,000
Other current assets	33,000,000	74,000,000
Total current assets	5,785,000,000	6,162,000,000
Property, Plant, and Equipment:
In service	64,793,000,000	63,251,000,000
Less accumulated provision for depreciation	22,821,000,000	21,964,000,000
Plant in service, net of depreciation	41,972,000,000	41,287,000,000
Other utility plant, net	252,000,000	263,000,000
Nuclear fuel, at amortized cost	832,000,000	851,000,000
Construction work in progress	7,144,000,000	5,989,000,000
Total property, plant, and equipment	50,200,000,000	48,390,000,000
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,397,000,000	1,303,000,000
Leveraged leases	658,000,000	670,000,000
Miscellaneous property and investments	220,000,000	216,000,000
Total other property and investments	2,275,000,000	2,189,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	1,402,000,000	1,385,000,000
Unamortized debt issuance expense	146,000,000	133,000,000
Unamortized loss on reacquired debt	291,000,000	309,000,000
Other regulatory assets, deferred	4,012,000,000	4,032,000,000
Other deferred charges and assets	586,000,000	549,000,000
Total deferred charges and other assets	6,437,000,000	6,408,000,000
Total Assets	64,697,000,000	63,149,000,000
Current Liabilities:
Securities due within one year	1,307,000,000	2,335,000,000
Interest-bearing refundable deposit related to asset sale	150,000,000	150,000,000
Notes payable	750,000,000	825,000,000
Other accounts payable	1,281,000,000	1,387,000,000
Customer deposits	377,000,000	370,000,000
Accrued taxes --
Accrued income taxes	87,000,000	10,000,000
Other accrued taxes	512,000,000	391,000,000
Accrued interest	262,000,000	237,000,000
Accrued vacation pay	210,000,000	212,000,000
Accrued compensation	250,000,000	433,000,000
Other regulatory liabilities, current	89,000,000	107,000,000
Other current liabilities	429,000,000	557,000,000
Total current liabilities	5,704,000,000	7,014,000,000
Long-term Debt	21,053,000,000	19,274,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	10,291,000,000	9,938,000,000
Deferred credits related to income taxes	203,000,000	211,000,000
Accumulated deferred investment tax credits	819,000,000	894,000,000
Employee benefit obligations	2,548,000,000	2,540,000,000
Asset retirement obligations	1,967,000,000	1,748,000,000
Other cost of removal obligations	1,278,000,000	1,194,000,000
Other regulatory liabilities, deferred	375,000,000	289,000,000
Other deferred credits and liabilities	550,000,000	668,000,000
Total deferred credits and other liabilities	18,031,000,000	17,482,000,000
Total Liabilities	44,788,000,000	43,770,000,000
Redeemable Preferred Stock of Subsidiaries	375,000,000	375,000,000
Common Stockholders' Equity:
Common stock	4,447,000,000	4,389,000,000
Paid-in capital	5,262,000,000	4,855,000,000
Treasury, at cost	(363,000,000)	(450,000,000)
Retained earnings	9,543,000,000	9,626,000,000
Accumulated other comprehensive loss	(111,000,000)	(123,000,000)
Total common stockholders' equity	18,778,000,000	18,297,000,000
Preferred and Preference Stock of Subsidiaries	756,000,000	707,000,000
Total Stockholders' Equity	19,534,000,000	19,004,000,000
Total Liabilities and Stockholders' Equity	64,697,000,000	63,149,000,000
Alabama Power [Member]
Current Assets:
Cash and cash equivalents	436,000,000	137,000,000
Receivables --
Customer accounts receivable	417,000,000	321,000,000
Unbilled revenues	133,000,000	138,000,000
Under recovered regulatory clause revenues	4,000,000	23,000,000
Other accounts and notes receivable	62,000,000	42,000,000
Affiliated companies	45,000,000	55,000,000
Accumulated provision for uncollectible accounts	(9,000,000)	(8,000,000)
Fossil fuel stock, at average cost	302,000,000	475,000,000
Materials and supplies, at average cost	370,000,000	395,000,000
Vacation pay	60,000,000	61,000,000
Prepaid expenses	74,000,000	81,000,000
Other regulatory assets, current	14,000,000	24,000,000
Other current assets	3,000,000	13,000,000
Total current assets	1,911,000,000	1,757,000,000
Property, Plant, and Equipment:
In service	21,916,000,000	21,407,000,000
Less accumulated provision for depreciation	8,016,000,000	7,761,000,000
Plant in service, net of depreciation	13,900,000,000	13,646,000,000
Nuclear fuel, at amortized cost	357,000,000	354,000,000
Construction work in progress	638,000,000	438,000,000
Total property, plant, and equipment	14,895,000,000	14,438,000,000
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	54,000,000	53,000,000
Nuclear decommissioning trusts, at fair value	673,000,000	605,000,000
Miscellaneous property and investments	78,000,000	78,000,000
Total other property and investments	805,000,000	736,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	521,000,000	525,000,000
Deferred under recovered regulatory clause revenues	30,000,000	11,000,000
Other regulatory assets, deferred	1,056,000,000	1,083,000,000
Other deferred charges and assets	134,000,000	162,000,000
Total deferred charges and other assets	1,741,000,000	1,781,000,000
Total Assets	19,352,000,000	18,712,000,000
Current Liabilities:
Securities due within one year	250,000,000	250,000,000
Affiliated accounts payable	192,000,000	191,000,000
Other accounts payable	225,000,000	318,000,000
Customer deposits	85,000,000	85,000,000
Accrued taxes --
Accrued income taxes	68,000,000	5,000,000
Other accrued taxes	108,000,000	33,000,000
Accrued interest	63,000,000	62,000,000
Accrued vacation pay	50,000,000	50,000,000
Accrued compensation	61,000,000	94,000,000
Other regulatory liabilities, current	45,000,000	3,000,000
Other current liabilities	42,000,000	52,000,000
Total current liabilities	1,189,000,000	1,143,000,000
Long-term Debt	5,934,000,000	5,929,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,596,000,000	3,404,000,000
Deferred credits related to income taxes	76,000,000	79,000,000
Accumulated deferred investment tax credits	135,000,000	141,000,000
Employee benefit obligations	323,000,000	321,000,000
Asset retirement obligations	720,000,000	589,000,000
Other cost of removal obligations	822,000,000	759,000,000
Other regulatory liabilities, deferred	211,000,000	183,000,000
Other deferred credits and liabilities	59,000,000	81,000,000
Total deferred credits and other liabilities	5,942,000,000	5,557,000,000
Total Liabilities	13,065,000,000	12,629,000,000
Redeemable Preferred Stock	342,000,000	342,000,000
Preference Stock	343,000,000	343,000,000
Common Stockholders' Equity:
Common stock	1,222,000,000	1,222,000,000
Paid-in capital	2,255,000,000	2,227,000,000
Retained earnings	2,151,000,000	1,976,000,000
Accumulated other comprehensive loss	(26,000,000)	(27,000,000)
Total common stockholders' equity	5,602,000,000	5,398,000,000
Total Liabilities and Stockholders' Equity	19,352,000,000	18,712,000,000
Georgia Power [Member]
Current Assets:
Cash and cash equivalents	53,000,000	45,000,000
Receivables --
Customer accounts receivable	657,000,000	484,000,000
Unbilled revenues	239,000,000	217,000,000
Joint owner accounts receivable	54,000,000	51,000,000
Other accounts and notes receivable	81,000,000	68,000,000
Affiliated companies	23,000,000	23,000,000
Accumulated provision for uncollectible accounts	(8,000,000)	(6,000,000)
Fossil fuel stock, at average cost	779,000,000	992,000,000
Materials and supplies, at average cost	422,000,000	452,000,000
Vacation pay	86,000,000	85,000,000
Prepaid income taxes	114,000,000	164,000,000
Other regulatory assets, current	43,000,000	72,000,000
Other current assets	75,000,000	104,000,000
Total current assets	2,618,000,000	2,751,000,000
Property, Plant, and Equipment:
In service	29,762,000,000	29,244,000,000
Less accumulated provision for depreciation	10,842,000,000	10,431,000,000
Plant in service, net of depreciation	18,920,000,000	18,813,000,000
Other utility plant, net	252,000,000	263,000,000
Nuclear fuel, at amortized cost	475,000,000	497,000,000
Construction work in progress	3,399,000,000	2,893,000,000
Total property, plant, and equipment	23,046,000,000	22,466,000,000
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	46,000,000	45,000,000
Nuclear decommissioning trusts, at fair value	724,000,000	698,000,000
Miscellaneous property and investments	43,000,000	44,000,000
Total other property and investments	813,000,000	787,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	713,000,000	733,000,000
Other regulatory assets, deferred	1,773,000,000	1,798,000,000
Other deferred charges and assets	244,000,000	268,000,000
Total deferred charges and other assets	2,730,000,000	2,799,000,000
Total Assets	29,207,000,000	28,803,000,000
Current Liabilities:
Securities due within one year	530,000,000	1,680,000,000
Notes payable	211,000,000	2,000,000
Affiliated accounts payable	428,000,000	417,000,000
Other accounts payable	428,000,000	436,000,000
Customer deposits	243,000,000	237,000,000
Accrued taxes --
Accrued income taxes	161,000,000	6,000,000
Other accrued taxes	283,000,000	260,000,000
Accrued interest	113,000,000	100,000,000
Accrued vacation pay	60,000,000	61,000,000
Accrued compensation	64,000,000	113,000,000
Liabilities from risk management activities	19,000,000	30,000,000
Other regulatory liabilities, current	18,000,000	73,000,000
Over recovered regulatory clause liabilities	81,000,000	107,000,000
Other current liabilities	109,000,000	146,000,000
Total current liabilities	2,748,000,000	3,668,000,000
Long-term Debt	8,739,000,000	7,994,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	5,139,000,000	4,861,000,000
Deferred credits related to income taxes	112,000,000	115,000,000
Accumulated deferred investment tax credits	205,000,000	208,000,000
Employee benefit obligations	976,000,000	950,000,000
Asset retirement obligations	1,182,000,000	1,097,000,000
Other cost of removal obligations	64,000,000	63,000,000
Other deferred credits and liabilities	177,000,000	308,000,000
Total deferred credits and other liabilities	7,855,000,000	7,602,000,000
Total Liabilities	19,342,000,000	19,264,000,000
Redeemable Preferred Stock	45,000,000	45,000,000
Preference Stock	221,000,000	221,000,000
Common Stockholders' Equity:
Common stock	398,000,000	398,000,000
Paid-in capital	5,625,000,000	5,585,000,000
Retained earnings	3,581,000,000	3,297,000,000
Accumulated other comprehensive loss	(5,000,000)	(7,000,000)
Total common stockholders' equity	9,599,000,000	9,273,000,000
Total Liabilities and Stockholders' Equity	29,207,000,000	28,803,000,000
Gulf Power [Member]
Current Assets:
Cash and cash equivalents	27,875,000	32,167,000
Receivables --
Customer accounts receivable	83,132,000	58,449,000
Unbilled revenues	61,322,000	53,363,000
Under recovered regulatory clause revenues	33,759,000	6,138,000
Other accounts and notes receivable	9,613,000	11,859,000
Affiliated companies	783,000	13,624,000
Accumulated provision for uncollectible accounts	(1,172,000)	(1,490,000)
Fossil fuel stock, at average cost	130,044,000	153,710,000
Materials and supplies, at average cost	56,048,000	53,365,000
Prepaid expenses	18,881,000	62,877,000
Other regulatory assets, current	26,465,000	30,576,000
Other current assets	2,271,000	2,690,000
Total current assets	449,021,000	477,328,000
Property, Plant, and Equipment:
In service	4,323,305,000	4,260,844,000
Less accumulated provision for depreciation	1,196,883,000	1,168,055,000
Plant in service, net of depreciation	3,126,422,000	3,092,789,000
Construction work in progress	247,290,000	136,062,000
Total property, plant, and equipment	3,373,712,000	3,228,851,000
Other Property and Investments:
Total other property and investments	15,442,000	15,737,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	51,715,000	50,139,000
Other regulatory assets, deferred	386,960,000	372,294,000
Other deferred charges and assets	36,563,000	33,053,000
Total deferred charges and other assets	475,238,000	455,486,000
Total Assets	4,313,413,000	4,177,402,000
Current Liabilities:
Securities due within one year	0	60,000,000
Notes payable	58,693,000	127,002,000
Affiliated accounts payable	81,588,000	66,161,000
Other accounts payable	40,711,000	54,551,000
Customer deposits	34,783,000	34,749,000
Accrued taxes --
Accrued income taxes	21,136,000	45,000
Other accrued taxes	27,705,000	7,036,000
Accrued interest	17,742,000	12,364,000
Accrued compensation	8,991,000	14,966,000
Liabilities from risk management activities	13,130,000	16,529,000
Other regulatory liabilities, current	14,316,000	25,887,000
Other current liabilities	21,888,000	19,930,000
Total current liabilities	340,683,000	439,220,000
Long-term Debt	1,246,022,000	1,185,870,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	689,840,000	648,952,000
Accumulated deferred investment tax credits	4,393,000	5,408,000
Employee benefit obligations	128,631,000	126,871,000
Other cost of removal obligations	224,977,000	213,413,000
Other regulatory liabilities, deferred	47,090,000	47,863,000
Deferred capacity expense	169,504,000	137,568,000
Other deferred credits and liabilities	78,705,000	93,497,000
Total deferred credits and other liabilities	1,343,140,000	1,273,572,000
Total Liabilities	2,929,845,000	2,898,662,000
Preference Stock	146,535,000	97,998,000
Common Stockholders' Equity:
Common stock	433,060,000	393,060,000
Paid-in capital	551,232,000	547,798,000
Retained earnings	253,943,000	241,465,000
Accumulated other comprehensive loss	(1,202,000)	(1,581,000)
Total common stockholders' equity	1,237,033,000	1,180,742,000
Total Liabilities and Stockholders' Equity	4,313,413,000	4,177,402,000
Mississippi Power [Member]
Current Assets:
Cash and cash equivalents	42,079,000	145,008,000
Receivables --
Customer accounts receivable	50,679,000	29,561,000
Unbilled revenues	38,802,000	32,688,000
Other accounts and notes receivable	5,580,000	7,517,000
Affiliated companies	39,334,000	27,160,000
Accumulated provision for uncollectible accounts	(636,000)	(373,000)
Fossil fuel stock, at average cost	116,955,000	176,378,000
Materials and supplies, at average cost	42,289,000	34,260,000
Prepaid income taxes	96,914,000	129,835,000
Other regulatory assets, current	55,375,000	55,302,000
Other current assets	5,270,000	17,170,000
Total current assets	492,641,000	654,506,000
Property, Plant, and Equipment:
In service	3,313,524,000	3,036,159,000
Less accumulated provision for depreciation	1,101,682,000	1,065,474,000
Plant in service, net of depreciation	2,211,842,000	1,970,685,000
Construction work in progress	2,339,396,000	2,393,145,000
Total property, plant, and equipment	4,551,238,000	4,363,830,000
Other Property and Investments:
Total other property and investments	4,912,000	4,887,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	110,978,000	71,869,000
Other regulatory assets, deferred	259,906,000	236,225,000
Other deferred charges and assets	52,618,000	42,304,000
Total deferred charges and other assets	423,502,000	350,398,000
Total Assets	5,472,293,000	5,373,621,000
Current Liabilities:
Securities due within one year	152,509,000	276,471,000
Interest-bearing refundable deposit related to asset sale	150,000,000	150,000,000
Affiliated accounts payable	65,065,000	54,769,000
Other accounts payable	263,913,000	262,992,000
Customer deposits	14,394,000	14,202,000
Accrued taxes --
Accrued income taxes	8,903,000	2,339,000
Other accrued taxes	61,117,000	69,376,000
Accrued interest	45,529,000	30,376,000
Accrued compensation	7,163,000	15,706,000
Other regulatory liabilities, current	11,846,000	5,376,000
Over recovered regulatory clause liabilities	28,091,000	77,338,000
Other current liabilities	24,825,000	31,882,000
Total current liabilities	833,355,000	990,827,000
Long-term Debt	2,069,938,000	1,564,462,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	29,086,000	244,958,000
Deferred credits related to income taxes	8,818,000	10,106,000
Accumulated deferred investment tax credits	284,496,000	370,554,000
Employee benefit obligations	161,938,000	157,421,000
Other cost of removal obligations	150,028,000	143,461,000
Other regulatory liabilities, deferred	117,804,000	56,984,000
Other deferred credits and liabilities	52,891,000	52,860,000
Total deferred credits and other liabilities	805,061,000	1,036,344,000
Total Liabilities	3,708,354,000	3,591,633,000
Redeemable Preferred Stock	32,780,000	32,780,000
Common Stockholders' Equity:
Common stock	37,691,000	37,691,000
Paid-in capital	1,944,336,000	1,401,520,000
Retained earnings	(242,792,000)	318,710,000
Accumulated other comprehensive loss	(8,076,000)	(8,713,000)
Total common stockholders' equity	1,731,159,000	1,749,208,000
Total Liabilities and Stockholders' Equity	5,472,293,000	5,373,621,000
Southern Power [Member]
Current Assets:
Cash and cash equivalents	42,137,000	28,592,000
Receivables --
Customer accounts receivable	86,717,000	62,857,000
Other accounts and notes receivable	1,754,000	3,135,000
Affiliated companies	44,474,000	38,269,000
Fossil fuel stock, at average cost	20,735,000	21,616,000
Materials and supplies, at average cost	52,272,000	46,370,000
Prepaid service agreements - current	80,053,000	80,629,000
Prepaid income taxes	67,729,000	4,498,000
Prepaid expenses	7,714,000	5,637,000
Assets from risk management activities	46,000	375,000
Total current assets	403,631,000	291,978,000
Property, Plant, and Equipment:
In service	4,203,999,000	4,059,839,000
Less accumulated provision for depreciation	871,648,000	786,620,000
Plant in service, net of depreciation	3,332,351,000	3,273,219,000
Construction work in progress	494,867,000	24,835,000
Total property, plant, and equipment	3,827,218,000	3,298,054,000
Other Property and Investments:
Goodwill	1,839,000	1,839,000
Other intangible assets, net of amortization of $4,996 and $3,141 at September 30, 2013 and December 31, 2012, respectively	44,124,000	45,979,000
Total other property and investments	45,963,000	47,818,000
Deferred Charges and Other Assets:
Prepaid long-term service agreements	85,651,000	100,921,000
Other deferred charges and assets -- affiliated	2,792,000	3,468,000
Other deferred charges and assets	83,863,000	37,688,000
Total deferred charges and other assets	172,306,000	142,077,000
Total Assets	4,449,118,000	3,779,927,000
Current Liabilities:
Securities due within one year	2,200,000	259,000
Notes payable	191,765,000	70,968,000
Affiliated accounts payable	68,677,000	65,832,000
Other accounts payable	20,131,000	26,204,000
Accrued taxes --
Accrued income taxes	2,303,000	87,000
Other accrued taxes	13,362,000	3,031,000
Accrued interest	13,953,000	22,259,000
Construction holdbacks	25,000,000	0
Other current liabilities	21,609,000	8,932,000
Total current liabilities	359,000,000	197,572,000
Long-term Debt	1,625,830,000	1,306,099,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	636,530,000	550,685,000
Deferred convertible investment tax credits	189,152,000	167,130,000
Deferred capacity revenues -- affiliated	28,048,000	19,514,000
Other deferred credits and liabilities — affiliated	1,876,000	2,638,000
Other deferred credits and liabilities	8,318,000	5,863,000
Total deferred credits and other liabilities	863,924,000	745,830,000
Total Liabilities	2,848,754,000	2,249,501,000
Redeemable Noncontrolling Interest	27,065,000	8,069,000
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	1,029,443,000	1,027,548,000
Retained earnings	541,013,000	495,585,000
Accumulated other comprehensive loss	2,843,000	(776,000)
Total common stockholders' equity	1,573,299,000	1,522,357,000
Total Liabilities and Stockholders' Equity	$ 4,449,118,000	$ 3,779,927,000