Consolidated Balance Sheets (USD $)	Dec. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 628,000,000	$ 1,315,000,000
Restricted cash and cash equivalents	7,000,000	8,000,000
Receivables --
Customer accounts receivable	961,000,000	1,074,000,000
Unbilled revenues	441,000,000	376,000,000
Under recovered regulatory clause revenues	29,000,000	143,000,000
Other accounts and notes receivable	235,000,000	282,000,000
Accumulated provision for uncollectible accounts	(17,000,000)	(26,000,000)
Fossil fuel stock, at average cost	1,819,000,000	1,367,000,000
Materials and supplies, at average cost	1,000,000,000	903,000,000
Vacation pay	165,000,000	160,000,000
Prepaid expenses	657,000,000	385,000,000
Other regulatory assets, current	163,000,000	239,000,000
Other current assets	74,000,000	46,000,000
Total current assets	6,162,000,000	6,272,000,000
Property, Plant, and Equipment:
In service	63,251,000,000	59,744,000,000
Less accumulated depreciation	21,964,000,000	21,154,000,000
Plant in service, net of depreciation	41,287,000,000	38,590,000,000
Other utility plant, net	263,000,000	55,000,000
Nuclear fuel, at amortized cost	851,000,000	774,000,000
Construction work in progress	5,989,000,000	5,591,000,000
Total property, plant, and equipment	48,390,000,000	45,010,000,000
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,303,000,000	1,207,000,000
Leveraged leases	670,000,000	649,000,000
Miscellaneous property and investments	216,000,000	262,000,000
Total other property and investments	2,189,000,000	2,118,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	1,385,000,000	1,365,000,000
Unamortized debt issuance expense	133,000,000	156,000,000
Unamortized loss on reacquired debt	309,000,000	285,000,000
Other regulatory assets, deferred	4,032,000,000	3,579,000,000
Other deferred charges and assets	549,000,000	482,000,000
Total deferred charges and other assets	6,408,000,000	5,867,000,000
Total Assets	63,149,000,000	59,267,000,000
Current Liabilities:
Securities due within one year	2,335,000,000	1,717,000,000
Interest Bearing Refundable Deposit Related to Assets Sale	150,000,000	0
Notes payable	825,000,000	859,000,000
Accounts payable	1,387,000,000	1,553,000,000
Customer deposits	370,000,000	347,000,000
Accrued taxes --
Accrued income taxes	7,000,000	13,000,000
Balance of unrecognized tax benefits	2,000,000	22,000,000
Other accrued taxes	391,000,000	425,000,000
Accrued interest	237,000,000	226,000,000
Accrued vacation pay	212,000,000	205,000,000
Accrued compensation	433,000,000	450,000,000
Liabilities from risk management activities	75,000,000	209,000,000
Other regulatory liabilities, current	107,000,000	125,000,000
Other current liabilities	483,000,000	426,000,000
Total current liabilities	7,014,000,000	6,577,000,000
Senior notes -
Unamortized debt premium	88,000,000	78,000,000
Unamortized debt discount	(35,000,000)	(32,000,000)
Long-term Debt	19,274,000,000	18,647,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	9,938,000,000	8,809,000,000
Deferred credits related to income taxes	211,000,000	224,000,000
Accumulated deferred investment tax credits	894,000,000	611,000,000
Employee benefit obligations	2,540,000,000	2,442,000,000
Asset retirement obligations	1,748,000,000	1,321,000,000
Other cost of removal obligations	1,194,000,000	1,165,000,000
Other regulatory liabilities, deferred	289,000,000	297,000,000
Other deferred credits and liabilities	668,000,000	514,000,000
Total deferred credits and other liabilities	17,482,000,000	15,383,000,000
Total Liabilities	43,770,000,000	40,607,000,000
Cumulative Redeemable Preferred Stock (See accompanying statements)	375,000,000	375,000,000
Common Stockholders' Equity:
Common stock	4,389,000,000	4,328,000,000
Paid-in capital	4,855,000,000	4,410,000,000
Treasury, at cost	(450,000,000)	(17,000,000)
Retained earnings	9,626,000,000	8,968,000,000
Accumulated other comprehensive loss	(123,000,000)	(111,000,000)
Total Common Stockholders' Equity	18,297,000,000	17,578,000,000
Preferred and Preference Stock of Subsidiaries	707,000,000	707,000,000
Total stockholders' equity	19,004,000,000	18,285,000,000
Total Liabilities and Stockholders' Equity	63,149,000,000	59,267,000,000
Commitments and Contingent Matters (See notes)
Southern Power [Member]
Current Assets:
Cash and cash equivalents	28,592,000	16,943,000
Receivables --
Customer accounts receivable	62,857,000	59,360,000
Other accounts and notes receivable	3,135,000	2,122,000
Affiliated companies	38,269,000	36,508,000
Fossil fuel stock, at average cost	21,616,000	13,038,000
Materials and supplies, at average cost	46,370,000	37,603,000
Prepaid service agreements - current	80,629,000	28,621,000
Prepaid income taxes	4,498,000	5,192,000
Prepaid expenses	5,637,000	4,645,000
Assets from risk management activities	375,000	177,000
Total current assets	291,978,000	204,209,000
Property, Plant, and Equipment:
In service	4,059,839,000	3,167,840,000
Less accumulated depreciation	786,620,000	652,087,000
Plant in service, net of depreciation	3,273,219,000	2,515,753,000
Construction work in progress	24,835,000	666,280,000
Total property, plant, and equipment	3,298,054,000	3,182,033,000
Other Property and Investments:
Goodwill	1,839,000	1,839,000
Other intangible assets, net of amortization	45,979,000	47,644,000
Total other property and investments	47,818,000	49,483,000
Deferred Charges and Other Assets:
Prepaid long-term service agreements	100,921,000	115,838,000
Other deferred charges and assets -- affiliated	3,468,000	3,029,000
Other deferred charges and assets	37,688,000	26,385,000
Total deferred charges and other assets	142,077,000	145,252,000
Total Assets	3,779,927,000	3,580,977,000
Current Liabilities:
Securities due within one year	259,000	555,000
Notes payable	70,968,000	179,520,000
Affiliated	65,832,000	63,609,000
Accounts payable	26,204,000	44,321,000
Accrued taxes --
Accrued income taxes	87,000	2,548,000
Other accrued taxes	3,031,000	2,158,000
Accrued interest	22,259,000	21,874,000
Liabilities from risk management activities	669,000	9,651,000
Other current liabilities	8,263,000	7,401,000
Total current liabilities	197,572,000	331,637,000
Senior notes -
Unamortized debt premium	2,557,000	2,645,000
Unamortized debt discount	(286,000)	(400,000)
Long-term Debt	1,306,099,000	1,302,758,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	550,685,000	319,790,000
Deferred convertible investment tax credits	167,130,000	125,065,000
Deferred capacity revenues -- affiliated	19,514,000	20,637,000
Other deferred credits and liabilities -- affiliated	2,638,000	3,618,000
Other deferred credits and liabilities	5,863,000	4,965,000
Total deferred credits and other liabilities	745,830,000	474,075,000
Total Liabilities	2,249,501,000	2,108,470,000
Redeemable Noncontrolling Interest	8,069,000	3,825,000
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	1,027,548,000	1,028,210,000
Retained earnings	495,585,000	447,301,000
Accumulated other comprehensive loss	(776,000)	(6,829,000)
Total Common Stockholders' Equity	1,522,357,000	1,468,682,000
Total stockholders' equity	1,522,357,000	1,468,682,000
Total Liabilities and Stockholders' Equity	3,779,927,000	3,580,977,000
Commitments and Contingent Matters (See notes)
Southern Power [Member] | 4.875% due 2015
Senior notes -
Senior notes	525,000,000	525,000,000
Southern Power [Member] | 6.375% due 2036
Senior notes -
Senior notes	200,000,000	200,000,000
Southern Power [Member] | 5.15% due 2041
Senior notes -
Senior notes	575,000,000	575,000,000
Southern Power [Member] | 3.25% due 2032
Senior notes -
Other long-term notes (3.25% due 2032)	3,828,000	513,000
Mississippi Power [Member]
Current Assets:
Cash and cash equivalents	145,008,000	211,585,000
Receivables --
Customer accounts receivable	29,561,000	32,551,000
Unbilled revenues	32,688,000	27,239,000
Other accounts and notes receivable	7,517,000	7,080,000
Affiliated companies	27,160,000	23,078,000
Accumulated provision for uncollectible accounts	(373,000)	(547,000)
Fossil fuel stock, at average cost	176,378,000	140,173,000
Materials and supplies, at average cost	34,260,000	30,787,000
Prepaid income taxes	129,835,000	37,793,000
Other regulatory assets, current	55,302,000	69,201,000
Other current assets	17,170,000	8,881,000
Total current assets	654,506,000	587,821,000
Property, Plant, and Equipment:
In service	3,036,159,000	2,902,240,000
Less accumulated depreciation	1,065,474,000	1,019,251,000
Plant in service, net of depreciation	1,970,685,000	1,882,989,000
Construction work in progress	2,471,145,000	955,135,000
Total property, plant, and equipment	4,441,830,000	2,838,124,000
Other Property and Investments:
Total other property and investments	4,887,000	6,520,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	71,869,000	25,009,000
Other regulatory assets, deferred	236,225,000	185,694,000
Other deferred charges and assets	42,304,000	28,674,000
Total deferred charges and other assets	350,398,000	239,377,000
Total Assets	5,451,621,000	3,671,842,000
Current Liabilities:
Securities due within one year	276,471,000	240,633,000
Interest Bearing Refundable Deposit Related to Assets Sale	150,000,000	0
Affiliated	54,769,000	62,650,000
Accounts payable	262,992,000	168,309,000
Customer deposits	14,202,000	13,658,000
Accrued taxes --
Accrued income taxes	2,339,000	3,813,000
Other accrued taxes	69,376,000	53,825,000
Accrued interest	30,376,000	12,750,000
Accrued compensation	15,706,000	15,889,000
Liabilities from risk management activities	13,116,000	54,127,000
Other regulatory liabilities, current	5,376,000	5,779,000
Over recovered regulatory clause liabilities	77,338,000	60,502,000
Other current liabilities	18,766,000	17,533,000
Total current liabilities	990,827,000	709,468,000
Senior notes -
Unamortized debt premium	80,912,000	74,551,000
Unamortized debt discount	(9,145,000)	(3,650,000)
Long-term Debt	1,564,462,000	1,103,596,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	274,793,000	270,397,000
Deferred credits related to income taxes	10,106,000	11,058,000
Accumulated deferred investment tax credits	370,554,000	109,761,000
Employee benefit obligations	157,421,000	161,065,000
Other cost of removal obligations	143,461,000	126,424,000
Other regulatory liabilities, deferred	56,984,000	60,848,000
Other deferred credits and liabilities	52,860,000	37,228,000
Total deferred credits and other liabilities	1,066,179,000	776,781,000
Total Liabilities	3,621,468,000	2,589,845,000
Redeemable Preferred Stock	32,780,000	32,780,000
Common Stockholders' Equity:
Common stock	37,691,000	37,691,000
Paid-in capital	1,401,520,000	694,855,000
Retained earnings	366,875,000	325,568,000
Accumulated other comprehensive loss	(8,713,000)	(8,897,000)
Total Common Stockholders' Equity	1,797,373,000	1,049,217,000
Total stockholders' equity	1,797,373,000	1,049,217,000
Total Liabilities and Stockholders' Equity	5,451,621,000	3,671,842,000
Commitments and Contingent Matters (See notes)
Gulf Power [Member]
Current Assets:
Cash and cash equivalents	32,167,000	17,328,000
Receivables --
Customer accounts receivable	58,449,000	72,754,000
Unbilled revenues	53,363,000	49,921,000
Under recovered regulatory clause revenues	6,138,000	5,530,000
Other accounts and notes receivable	11,859,000	13,350,000
Affiliated companies	13,624,000	14,844,000
Accumulated provision for uncollectible accounts	(1,490,000)	(1,962,000)
Fossil fuel stock, at average cost	153,710,000	147,567,000
Materials and supplies, at average cost	53,365,000	49,781,000
Prepaid expenses	62,877,000	28,327,000
Other regulatory assets, current	30,576,000	35,849,000
Other current assets	2,690,000	2,051,000
Total current assets	477,328,000	435,340,000
Property, Plant, and Equipment:
In service	4,260,844,000	3,846,446,000
Less accumulated depreciation	1,168,055,000	1,124,291,000
Plant in service, net of depreciation	3,092,789,000	2,722,155,000
Construction work in progress	136,062,000	287,173,000
Total property, plant, and equipment	3,228,851,000	3,009,328,000
Other Property and Investments:
Total other property and investments	15,737,000	16,394,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	50,139,000	48,210,000
Other regulatory assets, deferred	372,294,000	323,116,000
Other deferred charges and assets	33,053,000	39,493,000
Total deferred charges and other assets	455,486,000	410,819,000
Total Assets	4,177,402,000	3,871,881,000
Current Liabilities:
Securities due within one year	60,000,000	0
Notes payable	127,002,000	114,507,000
Affiliated	66,161,000	54,874,000
Accounts payable	54,551,000	63,265,000
Customer deposits	34,749,000	35,779,000
Accrued taxes --
Accrued income taxes	45,000	1,362,000
Other accrued taxes	7,036,000	12,114,000
Accrued interest	12,364,000	14,018,000
Accrued compensation	14,966,000	14,485,000
Liabilities from risk management activities	16,529,000	22,786,000
Other regulatory liabilities, current	25,887,000	35,639,000
Other current liabilities	19,930,000	22,916,000
Total current liabilities	439,220,000	391,745,000
Senior notes -
Long-term Debt	1,185,870,000	1,235,447,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	648,952,000	458,978,000
Accumulated deferred investment tax credits	5,408,000	6,760,000
Employee benefit obligations	126,871,000	109,740,000
Other cost of removal obligations	213,413,000	214,598,000
Other regulatory liabilities, deferred	47,863,000	44,843,000
Other deferred credits and liabilities	231,065,000	186,824,000
Total deferred credits and other liabilities	1,273,572,000	1,021,743,000
Total Liabilities	2,898,662,000	2,648,935,000
Preference Stock	97,998,000	97,998,000
Common Stockholders' Equity:
Common stock	393,060,000	353,060,000
Paid-in capital	547,798,000	542,709,000
Retained earnings	241,465,000	231,333,000
Accumulated other comprehensive loss	(1,581,000)	(2,154,000)
Total Common Stockholders' Equity	1,180,742,000	1,124,948,000
Total stockholders' equity	1,180,742,000	1,124,948,000
Total Liabilities and Stockholders' Equity	4,177,402,000	3,871,881,000
Commitments and Contingent Matters (See notes)
Georgia Power [Member]
Current Assets:
Cash and cash equivalents	45,000,000	13,000,000
Receivables --
Customer accounts receivable	484,000,000	571,000,000
Unbilled revenues	217,000,000	172,000,000
Under recovered regulatory clause revenues	0	137,000,000
Joint owner accounts receivable	51,000,000	87,000,000
Other accounts and notes receivable	68,000,000	61,000,000
Affiliated companies	23,000,000	26,000,000
Accumulated provision for uncollectible accounts	(6,000,000)	(13,000,000)
Fossil fuel stock, at average cost	992,000,000	723,000,000
Materials and supplies, at average cost	452,000,000	406,000,000
Vacation pay	85,000,000	82,000,000
Prepaid income taxes	164,000,000	71,000,000
Other regulatory assets, current	72,000,000	108,000,000
Other current assets	104,000,000	106,000,000
Total current assets	2,751,000,000	2,550,000,000
Property, Plant, and Equipment:
In service	29,244,000,000	27,804,000,000
Less accumulated depreciation	10,431,000,000	10,296,000,000
Plant in service, net of depreciation	18,813,000,000	17,508,000,000
Other utility plant, net	263,000,000	55,000,000
Nuclear fuel, at amortized cost	497,000,000	443,000,000
Construction work in progress	2,893,000,000	3,274,000,000
Total property, plant, and equipment	22,466,000,000	21,280,000,000
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	45,000,000	63,000,000
Nuclear decommissioning trusts, at fair value	698,000,000	667,000,000
Miscellaneous property and investments	44,000,000	44,000,000
Total other property and investments	787,000,000	774,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	733,000,000	756,000,000
Other regulatory assets, deferred	1,798,000,000	1,604,000,000
Other deferred charges and assets	268,000,000	187,000,000
Total deferred charges and other assets	2,799,000,000	2,547,000,000
Total Assets	28,803,000,000	27,151,000,000
Current Liabilities:
Securities due within one year	1,680,000,000	455,000,000
Notes payable	2,000,000	515,000,000
Affiliated	417,000,000	337,000,000
Accounts payable	436,000,000	686,000,000
Customer deposits	237,000,000	213,000,000
Accrued taxes --
Accrued income taxes	6,000,000	50,000,000
Other accrued taxes	260,000,000	304,000,000
Accrued interest	100,000,000	92,000,000
Accrued vacation pay	61,000,000	60,000,000
Accrued compensation	113,000,000	125,000,000
Liabilities from risk management activities	30,000,000	68,000,000
Other regulatory liabilities, current	73,000,000	65,000,000
Nuclear decommissioning trust securities lending collateral	9,000,000	32,000,000
Over Recovered Regulatory Clause Revenues, Current	107,000,000	0
Other current liabilities	137,000,000	139,000,000
Total current liabilities	3,668,000,000	3,141,000,000
Senior notes -
Long-term Debt	7,994,000,000	8,018,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	4,861,000,000	4,388,000,000
Deferred credits related to income taxes	115,000,000	122,000,000
Accumulated deferred investment tax credits	208,000,000	220,000,000
Employee benefit obligations	950,000,000	905,000,000
Asset retirement obligations	1,097,000,000	734,000,000
Other cost of removal obligations	63,000,000	110,000,000
Other deferred credits and liabilities	308,000,000	224,000,000
Total deferred credits and other liabilities	7,602,000,000	6,703,000,000
Total Liabilities	19,264,000,000	17,862,000,000
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	5,585,000,000	5,522,000,000
Retained earnings	3,297,000,000	3,112,000,000
Accumulated other comprehensive loss	(7,000,000)	(9,000,000)
Total Common Stockholders' Equity	9,273,000,000	9,023,000,000
Total stockholders' equity	9,273,000,000	9,023,000,000
Total Liabilities and Stockholders' Equity	28,803,000,000	27,151,000,000
Commitments and Contingent Matters (See notes)
Alabama Power [Member]
Current Assets:
Cash and cash equivalents	137,000,000	344,000,000
Restricted cash and cash equivalents	0	1,000,000
Receivables --
Customer accounts receivable	321,000,000	332,000,000
Unbilled revenues	138,000,000	126,000,000
Under recovered regulatory clause revenues	23,000,000	0
Other accounts and notes receivable	42,000,000	35,000,000
Affiliated companies	55,000,000	79,000,000
Accumulated provision for uncollectible accounts	(8,000,000)	(10,000,000)
Fossil fuel stock, at average cost	475,000,000	344,000,000
Materials and supplies, at average cost	395,000,000	375,000,000
Vacation pay	61,000,000	59,000,000
Prepaid expenses	81,000,000	74,000,000
Other regulatory assets, current	24,000,000	44,000,000
Other current assets	13,000,000	11,000,000
Total current assets	1,757,000,000	1,814,000,000
Property, Plant, and Equipment:
In service	21,407,000,000	20,809,000,000
Less accumulated depreciation	7,761,000,000	7,344,000,000
Plant in service, net of depreciation	13,646,000,000	13,465,000,000
Nuclear fuel, at amortized cost	354,000,000	330,000,000
Construction work in progress	438,000,000	374,000,000
Total property, plant, and equipment	14,438,000,000	14,169,000,000
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	53,000,000	62,000,000
Nuclear decommissioning trusts, at fair value	605,000,000	540,000,000
Miscellaneous property and investments	78,000,000	73,000,000
Total other property and investments	736,000,000	675,000,000
Deferred Charges and Other Assets:
Deferred charges related to income taxes	525,000,000	532,000,000
Prepaid pension costs	0	59,000,000
Deferred under recovered regulatory clause revenues	11,000,000	48,000,000
Other regulatory assets, deferred	1,083,000,000	994,000,000
Other deferred charges and assets	162,000,000	186,000,000
Total deferred charges and other assets	1,781,000,000	1,819,000,000
Total Assets	18,712,000,000	18,477,000,000
Current Liabilities:
Securities due within one year	250,000,000	500,000,000
Affiliated	191,000,000	203,000,000
Accounts payable	318,000,000	322,000,000
Customer deposits	85,000,000	85,000,000
Accrued taxes --
Accrued income taxes	5,000,000	32,000,000
Other accrued taxes	33,000,000	34,000,000
Accrued interest	62,000,000	63,000,000
Accrued vacation pay	50,000,000	48,000,000
Accrued compensation	94,000,000	95,000,000
Liabilities from risk management activities	14,000,000	54,000,000
Other regulatory liabilities, current	3,000,000	18,000,000
Other current liabilities	38,000,000	38,000,000
Total current liabilities	1,143,000,000	1,492,000,000
Senior notes -
Long-term Debt	5,929,000,000	5,632,000,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,404,000,000	3,257,000,000
Deferred credits related to income taxes	79,000,000	83,000,000
Accumulated deferred investment tax credits	141,000,000	149,000,000
Employee benefit obligations	321,000,000	343,000,000
Asset retirement obligations	589,000,000	553,000,000
Other cost of removal obligations	759,000,000	703,000,000
Other regulatory liabilities, deferred	183,000,000	156,000,000
Other deferred credits and liabilities	81,000,000	82,000,000
Total deferred credits and other liabilities	5,557,000,000	5,326,000,000
Total Liabilities	12,629,000,000	12,450,000,000
Cumulative Redeemable Preferred Stock (See accompanying statements)	342,000,000	342,000,000
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	2,227,000,000	2,182,000,000
Retained earnings	1,976,000,000	1,956,000,000
Accumulated other comprehensive loss	(27,000,000)	(18,000,000)
Total Common Stockholders' Equity	5,398,000,000	5,342,000,000
Total stockholders' equity	5,398,000,000	5,342,000,000
Total Liabilities and Stockholders' Equity	18,712,000,000	18,477,000,000
Commitments and Contingent Matters (See notes)