Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 515,000,000	$ 628,000,000
Restricted cash and cash equivalents	25,000,000	7,000,000
Receivables --
Customer accounts receivable	1,011,000,000	961,000,000
Unbilled revenues	390,000,000	441,000,000
Under recovered regulatory clause revenues	26,000,000	29,000,000
Other accounts and notes receivable	223,000,000	235,000,000
Accumulated provision for uncollectible accounts	(15,000,000)	(17,000,000)
Fossil fuel stock, at average cost	1,783,000,000	1,819,000,000
Materials and supplies, at average cost	940,000,000	1,000,000,000
Vacation pay	166,000,000	165,000,000
Prepaid expenses	693,000,000	657,000,000
Other regulatory assets, current	115,000,000	163,000,000
Other current assets	60,000,000	74,000,000
Total current assets	5,932,000,000	6,162,000,000
Property, Plant, and Equipment:
In service	63,586,000,000	63,251,000,000
Less accumulated provision for depreciation	22,219,000,000	21,964,000,000
Plant in service, net of depreciation	41,367,000,000	41,287,000,000
Other utility plant, net	266,000,000	263,000,000
Nuclear fuel, at amortized cost	861,000,000	851,000,000
Construction work in progress	6,193,000,000	5,989,000,000
Total property, plant, and equipment	48,687,000,000	48,390,000,000
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,365,000,000	1,303,000,000
Leveraged leases	648,000,000	670,000,000
Miscellaneous property and investments	217,000,000	216,000,000
Total other property and investments	2,230,000,000	2,189,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	1,387,000,000	1,385,000,000
Unamortized debt issuance expense	144,000,000	133,000,000
Unamortized loss on reacquired debt	303,000,000	309,000,000
Other regulatory assets, deferred	4,021,000,000	4,032,000,000
Other deferred charges and assets	570,000,000	549,000,000
Total deferred charges and other assets	6,425,000,000	6,408,000,000
Total Assets	63,274,000,000	63,149,000,000
Current Liabilities:
Securities due within one year	1,769,000,000	2,335,000,000
Interest-bearing refundable deposit related to asset sale	150,000,000	150,000,000
Notes payable	1,294,000,000	825,000,000
Accounts payable	1,369,000,000	1,387,000,000
Customer deposits	376,000,000	370,000,000
Accrued taxes --
Accrued income taxes	38,000,000	10,000,000
Other accrued taxes	208,000,000	391,000,000
Accrued interest	249,000,000	237,000,000
Accrued vacation pay	212,000,000	212,000,000
Accrued compensation	161,000,000	433,000,000
Liabilities from risk management activities	37,000,000	75,000,000
Other regulatory liabilities, current	114,000,000	107,000,000
Other current liabilities	462,000,000	482,000,000
Total current liabilities	6,439,000,000	7,014,000,000
Long-term Debt	20,223,000,000	19,274,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	9,842,000,000	9,938,000,000
Deferred credits related to income taxes	207,000,000	211,000,000
Accumulated deferred investment tax credits	946,000,000	894,000,000
Employee benefit obligations	2,526,000,000	2,540,000,000
Asset retirement obligations	1,807,000,000	1,748,000,000
Other cost of removal obligations	1,220,000,000	1,194,000,000
Other regulatory liabilities, deferred	312,000,000	289,000,000
Other deferred credits and liabilities	633,000,000	668,000,000
Total deferred credits and other liabilities	17,493,000,000	17,482,000,000
Total Liabilities	44,155,000,000	43,770,000,000
Redeemable Preferred Stock of Subsidiaries	375,000,000	375,000,000
Common Stockholders' Equity:
Common stock	4,400,000,000	4,389,000,000
Paid-in capital	4,926,000,000	4,855,000,000
Treasury, at cost	(451,000,000)	(450,000,000)
Retained earnings	9,281,000,000	9,626,000,000
Accumulated other comprehensive loss	(119,000,000)	(123,000,000)
Total common stockholders' equity	18,037,000,000	18,297,000,000
Preferred and Preference Stock of Subsidiaries	707,000,000	707,000,000
Total Stockholders' Equity	18,744,000,000	19,004,000,000
Total Liabilities and Stockholders' Equity	63,274,000,000	63,149,000,000
Alabama Power [Member]
Current Assets:
Cash and cash equivalents	65,000,000	137,000,000
Receivables --
Customer accounts receivable	349,000,000	321,000,000
Unbilled revenues	122,000,000	138,000,000
Under recovered regulatory clause revenues	11,000,000	23,000,000
Other accounts and notes receivable	35,000,000	42,000,000
Affiliated companies	74,000,000	55,000,000
Accumulated provision for uncollectible accounts	(8,000,000)	(8,000,000)
Fossil fuel stock, at average cost	447,000,000	475,000,000
Materials and supplies, at average cost	370,000,000	395,000,000
Vacation pay	61,000,000	61,000,000
Prepaid expenses	121,000,000	81,000,000
Other regulatory assets, current	13,000,000	24,000,000
Other current assets	14,000,000	13,000,000
Total current assets	1,674,000,000	1,757,000,000
Property, Plant, and Equipment:
In service	21,508,000,000	21,407,000,000
Less accumulated provision for depreciation	7,816,000,000	7,761,000,000
Plant in service, net of depreciation	13,692,000,000	13,646,000,000
Nuclear fuel, at amortized cost	356,000,000	354,000,000
Construction work in progress	535,000,000	438,000,000
Total property, plant, and equipment	14,583,000,000	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	642,000,000	605,000,000
Miscellaneous property and investments	78,000,000	78,000,000
Total other property and investments	774,000,000	736,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	524,000,000	525,000,000
Deferred under recovered regulatory clause revenues	15,000,000	11,000,000
Other regulatory assets, deferred	1,071,000,000	1,083,000,000
Other deferred charges and assets	128,000,000	162,000,000
Total deferred charges and other assets	1,738,000,000	1,781,000,000
Total Assets	18,769,000,000	18,712,000,000
Current Liabilities:
Securities due within one year	250,000,000	250,000,000
Notes payable	45,000,000	0
Affiliated	188,000,000	191,000,000
Accounts payable	204,000,000	318,000,000
Customer deposits	86,000,000	85,000,000
Accrued taxes --
Accrued income taxes	73,000,000	5,000,000
Other accrued taxes	56,000,000	33,000,000
Accrued interest	60,000,000	62,000,000
Accrued vacation pay	50,000,000	50,000,000
Accrued compensation	36,000,000	94,000,000
Liabilities from risk management activities	5,000,000	14,000,000
Other regulatory liabilities, current	29,000,000	3,000,000
Other current liabilities	38,000,000	38,000,000
Total current liabilities	1,120,000,000	1,143,000,000
Long-term Debt	5,929,000,000	5,929,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,418,000,000	3,404,000,000
Deferred credits related to income taxes	78,000,000	79,000,000
Accumulated deferred investment tax credits	139,000,000	141,000,000
Employee benefit obligations	319,000,000	321,000,000
Asset retirement obligations	599,000,000	589,000,000
Other cost of removal obligations	773,000,000	759,000,000
Other regulatory liabilities, deferred	203,000,000	183,000,000
Other deferred credits and liabilities	91,000,000	81,000,000
Total deferred credits and other liabilities	5,620,000,000	5,557,000,000
Total Liabilities	12,669,000,000	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	2,236,000,000	2,227,000,000
Retained earnings	1,984,000,000	1,976,000,000
Accumulated other comprehensive loss	(27,000,000)	(27,000,000)
Total common stockholders' equity	5,415,000,000	5,398,000,000
Total Liabilities and Stockholders' Equity	18,769,000,000	18,712,000,000
Georgia Power [Member]
Current Assets:
Cash and cash equivalents	79,000,000	45,000,000
Restricted cash and cash equivalents	18,000,000	0
Receivables --
Customer accounts receivable	500,000,000	484,000,000
Unbilled revenues	187,000,000	217,000,000
Joint owner accounts receivable	52,000,000	51,000,000
Other accounts and notes receivable	53,000,000	68,000,000
Affiliated companies	25,000,000	23,000,000
Accumulated provision for uncollectible accounts	(6,000,000)	(6,000,000)
Fossil fuel stock, at average cost	996,000,000	992,000,000
Materials and supplies, at average cost	409,000,000	452,000,000
Vacation pay	86,000,000	85,000,000
Prepaid income taxes	151,000,000	164,000,000
Other regulatory assets, current	48,000,000	72,000,000
Other current assets	48,000,000	104,000,000
Total current assets	2,646,000,000	2,751,000,000
Property, Plant, and Equipment:
In service	29,462,000,000	29,244,000,000
Less accumulated provision for depreciation	10,574,000,000	10,431,000,000
Plant in service, net of depreciation	18,888,000,000	18,813,000,000
Other utility plant, net	266,000,000	263,000,000
Nuclear fuel, at amortized cost	506,000,000	497,000,000
Construction work in progress	3,079,000,000	2,893,000,000
Total property, plant, and equipment	22,739,000,000	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	723,000,000	698,000,000
Miscellaneous property and investments	42,000,000	44,000,000
Total other property and investments	811,000,000	787,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	726,000,000	733,000,000
Other regulatory assets, deferred	1,794,000,000	1,798,000,000
Other deferred charges and assets	279,000,000	268,000,000
Total deferred charges and other assets	2,799,000,000	2,799,000,000
Total Assets	28,995,000,000	28,803,000,000
Current Liabilities:
Securities due within one year	1,047,000,000	1,680,000,000
Notes payable	302,000,000	2,000,000
Affiliated	419,000,000	417,000,000
Accounts payable	503,000,000	436,000,000
Customer deposits	241,000,000	237,000,000
Accrued taxes --
Accrued income taxes	43,000,000	6,000,000
Other accrued taxes	96,000,000	260,000,000
Accrued interest	113,000,000	100,000,000
Accrued vacation pay	60,000,000	61,000,000
Accrued compensation	48,000,000	113,000,000
Liabilities from risk management activities	17,000,000	30,000,000
Other regulatory liabilities, current	56,000,000	73,000,000
Over recovered regulatory clause liabilities	117,000,000	107,000,000
Other current liabilities	119,000,000	146,000,000
Total current liabilities	3,181,000,000	3,668,000,000
Long-term Debt	8,641,000,000	7,994,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	4,914,000,000	4,861,000,000
Deferred credits related to income taxes	113,000,000	115,000,000
Accumulated deferred investment tax credits	206,000,000	208,000,000
Employee benefit obligations	945,000,000	950,000,000
Asset retirement obligations	1,148,000,000	1,097,000,000
Other cost of removal obligations	63,000,000	63,000,000
Other deferred credits and liabilities	260,000,000	308,000,000
Total deferred credits and other liabilities	7,649,000,000	7,602,000,000
Total Liabilities	19,471,000,000	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	5,599,000,000	5,585,000,000
Retained earnings	3,267,000,000	3,297,000,000
Accumulated other comprehensive loss	(6,000,000)	(7,000,000)
Total common stockholders' equity	9,258,000,000	9,273,000,000
Total Liabilities and Stockholders' Equity	28,995,000,000	28,803,000,000
Gulf Power [Member]
Current Assets:
Cash and cash equivalents	27,931,000	32,167,000
Receivables --
Customer accounts receivable	61,190,000	58,449,000
Unbilled revenues	47,817,000	53,363,000
Under recovered regulatory clause revenues	15,153,000	6,138,000
Other accounts and notes receivable	13,019,000	11,859,000
Affiliated companies	8,709,000	13,624,000
Accumulated provision for uncollectible accounts	(1,261,000)	(1,490,000)
Fossil fuel stock, at average cost	152,287,000	153,710,000
Materials and supplies, at average cost	53,877,000	53,365,000
Prepaid expenses	63,697,000	62,877,000
Other regulatory assets, current	20,475,000	30,576,000
Other current assets	10,682,000	2,690,000
Total current assets	473,576,000	477,328,000
Property, Plant, and Equipment:
In service	4,261,604,000	4,260,844,000
Less accumulated provision for depreciation	1,170,499,000	1,168,055,000
Plant in service, net of depreciation	3,091,105,000	3,092,789,000
Construction work in progress	178,025,000	136,062,000
Total property, plant, and equipment	3,269,130,000	3,228,851,000
Other Property and Investments:
Total other property and investments	15,494,000	15,737,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	50,664,000	50,139,000
Other regulatory assets, deferred	373,289,000	372,294,000
Other deferred charges and assets	33,531,000	33,053,000
Total deferred charges and other assets	457,484,000	455,486,000
Total Assets	4,215,684,000	4,177,402,000
Current Liabilities:
Securities due within one year	60,000,000	60,000,000
Notes payable	132,811,000	127,002,000
Affiliated	60,226,000	66,161,000
Accounts payable	44,953,000	54,551,000
Customer deposits	34,950,000	34,749,000
Accrued taxes --
Accrued income taxes	4,094,000	45,000
Other accrued taxes	12,302,000	7,036,000
Accrued interest	18,098,000	12,364,000
Accrued compensation	5,514,000	14,966,000
Liabilities from risk management activities	7,782,000	16,529,000
Other regulatory liabilities, current	18,903,000	25,887,000
Other current liabilities	20,429,000	19,930,000
Total current liabilities	420,062,000	439,220,000
Long-term Debt	1,186,022,000	1,185,870,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	660,762,000	648,952,000
Accumulated deferred investment tax credits	5,070,000	5,408,000
Employee benefit obligations	127,254,000	126,871,000
Other cost of removal obligations	218,801,000	213,413,000
Other regulatory liabilities, deferred	50,027,000	47,863,000
Deferred capacity expense	148,213,000	137,568,000
Other deferred credits and liabilities	86,514,000	93,497,000
Total deferred credits and other liabilities	1,296,641,000	1,273,572,000
Total Liabilities	2,902,725,000	2,898,662,000
Preference Stock	97,998,000	97,998,000
Common Stockholders' Equity:
Common stock	433,060,000	393,060,000
Paid-in capital	548,933,000	547,798,000
Retained earnings	234,406,000	241,465,000
Accumulated other comprehensive loss	(1,438,000)	(1,581,000)
Total common stockholders' equity	1,214,961,000	1,180,742,000
Total Liabilities and Stockholders' Equity	4,215,684,000	4,177,402,000
Mississippi Power [Member]
Current Assets:
Cash and cash equivalents	187,759,000	145,008,000
Receivables --
Customer accounts receivable	32,288,000	29,561,000
Unbilled revenues	33,324,000	32,688,000
Other accounts and notes receivable	5,851,000	7,517,000
Affiliated companies	31,475,000	27,160,000
Accumulated provision for uncollectible accounts	(298,000)	(373,000)
Fossil fuel stock, at average cost	167,963,000	176,378,000
Materials and supplies, at average cost	39,004,000	34,260,000
Prepaid income taxes	173,818,000	129,835,000
Other regulatory assets, current	53,058,000	55,302,000
Other current assets	33,268,000	17,170,000
Total current assets	757,510,000	654,506,000
Property, Plant, and Equipment:
In service	3,073,750,000	3,036,159,000
Less accumulated provision for depreciation	1,083,639,000	1,065,474,000
Plant in service, net of depreciation	1,990,111,000	1,970,685,000
Construction work in progress	2,289,256,000	2,393,145,000
Total property, plant, and equipment	4,279,367,000	4,363,830,000
Other Property and Investments:
Total other property and investments	4,836,000	4,887,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	81,855,000	71,869,000
Other regulatory assets, deferred	244,585,000	236,225,000
Other deferred charges and assets	36,943,000	42,304,000
Total deferred charges and other assets	363,383,000	350,398,000
Total Assets	5,405,096,000	5,373,621,000
Current Liabilities:
Securities due within one year	342,285,000	276,471,000
Interest-bearing refundable deposit related to asset sale	150,000,000	150,000,000
Affiliated	53,795,000	54,769,000
Accounts payable	273,305,000	262,992,000
Customer deposits	14,415,000	14,202,000
Accrued taxes --
Accrued income taxes	4,750,000	2,339,000
Other accrued taxes	21,951,000	69,376,000
Accrued interest	36,946,000	30,376,000
Accrued compensation	5,459,000	15,706,000
Liabilities from risk management activities	6,671,000	13,116,000
Other regulatory liabilities, current	10,863,000	5,376,000
Over recovered regulatory clause liabilities	80,333,000	77,338,000
Other current liabilities	19,200,000	18,766,000
Total current liabilities	1,019,973,000	990,827,000
Long-term Debt	1,869,056,000	1,564,462,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	80,676,000	244,958,000
Deferred credits related to income taxes	9,676,000	10,106,000
Accumulated deferred investment tax credits	420,678,000	370,554,000
Employee benefit obligations	157,542,000	157,421,000
Other cost of removal obligations	148,190,000	143,461,000
Other regulatory liabilities, deferred	56,457,000	56,984,000
Other deferred credits and liabilities	49,842,000	52,860,000
Total deferred credits and other liabilities	923,061,000	1,036,344,000
Total Liabilities	3,812,090,000	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	1,502,836,000	1,401,520,000
Retained earnings	28,199,000	318,710,000
Accumulated other comprehensive loss	(8,500,000)	(8,713,000)
Total common stockholders' equity	1,560,226,000	1,749,208,000
Total Liabilities and Stockholders' Equity	5,405,096,000	5,373,621,000
Southern Power [Member]
Current Assets:
Cash and cash equivalents	75,596,000	28,592,000
Receivables --
Customer accounts receivable	64,391,000	62,857,000
Other accounts and notes receivable	2,164,000	3,135,000
Affiliated companies	26,252,000	38,269,000
Fossil fuel stock, at average cost	19,776,000	21,616,000
Materials and supplies, at average cost	49,943,000	46,370,000
Prepaid service agreements - current	104,424,000	80,629,000
Prepaid income taxes	11,696,000	4,498,000
Prepaid expenses	4,318,000	5,637,000
Assets from risk management activities	2,916,000	375,000
Total current assets	361,476,000	291,978,000
Property, Plant, and Equipment:
In service	4,032,559,000	4,059,839,000
Less accumulated provision for depreciation	808,958,000	786,620,000
Plant in service, net of depreciation	3,223,601,000	3,273,219,000
Construction work in progress	80,502,000	24,835,000
Total property, plant, and equipment	3,304,103,000	3,298,054,000
Other Property and Investments:
Goodwill	1,839,000	1,839,000
Other intangible assets, net of amortization of $3,759 and $3,141 at March 31, 2013 and December 31, 2012, respectively	45,360,000	45,979,000
Total other property and investments	47,199,000	47,818,000
Deferred Charges and Other Assets:
Prepaid long-term service agreements	96,121,000	100,921,000
Other deferred charges and assets -- affiliated	6,692,000	3,468,000
Other deferred charges and assets	42,675,000	37,688,000
Total deferred charges and other assets	145,488,000	142,077,000
Total Assets	3,858,266,000	3,779,927,000
Current Liabilities:
Securities due within one year	98,000	259,000
Notes payable	147,953,000	70,968,000
Affiliated	66,864,000	65,832,000
Accounts payable	22,197,000	26,204,000
Accrued taxes --
Accrued income taxes	1,224,000	87,000
Other accrued taxes	6,915,000	3,031,000
Accrued interest	11,433,000	22,259,000
Liabilities from risk management activities	590,000	669,000
Other current liabilities	7,734,000	8,263,000
Total current liabilities	265,008,000	197,572,000
Long-term Debt	1,307,762,000	1,306,099,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	564,301,000	550,685,000
Deferred convertible investment tax credits	174,471,000	167,130,000
Deferred capacity revenues -- affiliated	6,835,000	19,514,000
Other deferred credits and liabilities — affiliated	2,384,000	2,638,000
Other deferred credits and liabilities	5,880,000	5,863,000
Total deferred credits and other liabilities	753,871,000	745,830,000
Total Liabilities	2,326,641,000	2,249,501,000
Redeemable Noncontrolling Interest	9,689,000	8,069,000
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	1,028,581,000	1,027,548,000
Retained earnings	492,497,000	495,585,000
Accumulated other comprehensive loss	858,000	(776,000)
Total common stockholders' equity	1,521,936,000	1,522,357,000
Total Liabilities and Stockholders' Equity	$ 3,858,266,000	$ 3,779,927,000