Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities:
Consolidated net income	$ 410,000,000	$ 1,023,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	1,140,000,000	1,064,000,000
Deferred income taxes	(141,000,000)	327,000,000
Investment tax credits	83,000,000	16,000,000
Allowance for equity funds used during construction	(86,000,000)	(63,000,000)
Leveraged lease income (loss)	16,000,000	(11,000,000)
Pension, postretirement, and other employee benefits	41,000,000	13,000,000
Stock based compensation expense	37,000,000	35,000,000
Retail fuel cost over recovery - long-term	(123,000,000)	44,000,000
Estimated loss on Kemper IGCC	990,000,000	0
Other, net	31,000,000	(22,000,000)
Changes in certain current assets and liabilities --
-Receivables	(325,000,000)	(55,000,000)
-Fossil fuel stock	185,000,000	(305,000,000)
-Materials and supplies	52,000,000	(17,000,000)
-Other current assets	(55,000,000)	(36,000,000)
-Accounts payable	(52,000,000)	(167,000,000)
-Accrued taxes	6,000,000	45,000,000
-Accrued compensation	(257,000,000)	(216,000,000)
-Retail fuel cost over recovery - short-term	(22,000,000)	101,000,000
-Other current liabilities	17,000,000	(19,000,000)
Net cash provided from operating activities	1,947,000,000	1,757,000,000
Investing Activities:
Property additions	(2,597,000,000)	(2,356,000,000)
Investment of restricted cash	(98,000,000)	(230,000,000)
Distribution of restricted cash	23,000,000	49,000,000
Nuclear decommissioning trust fund purchases	(548,000,000)	(576,000,000)
Nuclear decommissioning trust fund sales	546,000,000	574,000,000
Cost of removal, net of salvage	(56,000,000)	(58,000,000)
Change in construction payables	114,000,000	(115,000,000)
Other investing activities	(13,000,000)	(79,000,000)
Net cash used for investing activities	(2,629,000,000)	(2,791,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	767,000,000	(406,000,000)
Proceeds --
Long-term debt issuances	1,197,000,000	2,487,000,000
Interest-bearing refundable deposit related to asset sale	0	150,000,000
Preference stock	50,000,000	0
Common stock issuances	161,000,000	316,000,000
Redemptions --
Long-term debt	(792,000,000)	(1,319,000,000)
Common stock repurchased	(18,000,000)	0
Payment of common stock dividends	(870,000,000)	(837,000,000)
Payment of dividends on preferred and preference stock of subsidiaries	(32,000,000)	(32,000,000)
Other financing activities	15,000,000	19,000,000
Net cash provided from (used for) financing activities	478,000,000	378,000,000
Net Change in Cash and Cash Equivalents	(204,000,000)	(656,000,000)
Cash and Cash Equivalents at Beginning of Period	628,000,000	1,315,000,000
Cash and Cash Equivalents at End of Period	424,000,000	659,000,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	384,000,000	391,000,000
Income taxes, net	142,000,000	(34,000,000)
Noncash transactions - accrued property additions at end of period	637,000,000	488,000,000
Alabama Power [Member]
Operating Activities:
Consolidated net income	334,000,000	331,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	403,000,000	380,000,000
Deferred income taxes	53,000,000	85,000,000
Allowance for equity funds used during construction	(16,000,000)	(9,000,000)
Stock based compensation expense	6,000,000	6,000,000
Other, net	(18,000,000)	(33,000,000)
Changes in certain current assets and liabilities --
-Receivables	(65,000,000)	(46,000,000)
-Fossil fuel stock	76,000,000	(125,000,000)
-Materials and supplies	22,000,000	(6,000,000)
-Other current assets	(45,000,000)	(31,000,000)
-Accounts payable	(93,000,000)	(145,000,000)
-Accrued taxes	60,000,000	128,000,000
-Accrued compensation	(54,000,000)	(45,000,000)
-Retail fuel cost over recovery - short-term	12,000,000	2,000,000
-Other current liabilities	4,000,000	(11,000,000)
Net cash provided from operating activities	679,000,000	481,000,000
Investing Activities:
Property additions	(518,000,000)	(436,000,000)
Nuclear decommissioning trust fund purchases	(120,000,000)	(88,000,000)
Nuclear decommissioning trust fund sales	120,000,000	88,000,000
Cost of removal, net of salvage	(19,000,000)	(7,000,000)
Change in construction payables	(21,000,000)	(12,000,000)
Other investing activities	30,000,000	(9,000,000)
Net cash used for investing activities	(528,000,000)	(464,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	46,000,000	0
Proceeds --
Capital contributions from parent company	10,000,000	11,000,000
Senior notes issuances	0	250,000,000
Redemptions --
Pollution control revenue bonds	0	(1,000,000)
Senior notes	0	(250,000,000)
Payment of preferred and preference stock dividends	(20,000,000)	(20,000,000)
Payment of common stock dividends	(265,000,000)	(270,000,000)
Other financing activities	0	(3,000,000)
Net cash provided from (used for) financing activities	(229,000,000)	(283,000,000)
Net Change in Cash and Cash Equivalents	(78,000,000)	(266,000,000)
Cash and Cash Equivalents at Beginning of Period	137,000,000	344,000,000
Cash and Cash Equivalents at End of Period	59,000,000	78,000,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	119,000,000	136,000,000
Income taxes, net	146,000,000	31,000,000
Noncash transactions - accrued property additions at end of period	10,000,000	7,000,000
Georgia Power [Member]
Operating Activities:
Consolidated net income	488,000,000	471,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	487,000,000	458,000,000
Deferred income taxes	126,000,000	128,000,000
Allowance for equity funds used during construction	(13,000,000)	(26,000,000)
Retail fuel cost over recovery - long-term	(123,000,000)	44,000,000
Deferred expenses	31,000,000	26,000,000
Other, net	(8,000,000)	(3,000,000)
Changes in certain current assets and liabilities --
-Receivables	(123,000,000)	19,000,000
-Fossil fuel stock	56,000,000	(147,000,000)
-Prepaid income taxes	5,000,000	13,000,000
-Other current assets	34,000,000	8,000,000
-Accounts payable	43,000,000	(37,000,000)
-Accrued taxes	(14,000,000)	(77,000,000)
-Accrued compensation	(66,000,000)	(60,000,000)
-Retail fuel cost over recovery - short-term	1,000,000	55,000,000
-Other current liabilities	7,000,000	43,000,000
Net cash provided from operating activities	931,000,000	915,000,000
Investing Activities:
Property additions	(765,000,000)	(812,000,000)
Investment of restricted cash	(18,000,000)	(234,000,000)
Distribution of restricted cash	18,000,000	49,000,000
Nuclear decommissioning trust fund purchases	(427,000,000)	(488,000,000)
Nuclear decommissioning trust fund sales	426,000,000	486,000,000
Cost of removal, net of salvage	(27,000,000)	(34,000,000)
Change in construction payables, net of joint owner portion	(2,000,000)	(161,000,000)
Other investing activities	(12,000,000)	(14,000,000)
Net cash used for investing activities	(807,000,000)	(1,208,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	314,000,000	(513,000,000)
Proceeds --
Capital contributions from parent company	21,000,000	18,000,000
Pollution control revenue bonds issuances	18,000,000	234,000,000
Senior notes issuances	650,000,000	1,500,000,000
Redemptions --
Pollution control revenue bonds	(18,000,000)	(49,000,000)
Senior notes	(650,000,000)	0
Other long-term debt	0	(250,000,000)
Payment of preferred and preference stock dividends	(9,000,000)	(9,000,000)
Payment of common stock dividends	(454,000,000)	(454,000,000)
Other financing activities	(12,000,000)	(9,000,000)
Net cash provided from (used for) financing activities	(140,000,000)	468,000,000
Net Change in Cash and Cash Equivalents	(16,000,000)	175,000,000
Cash and Cash Equivalents at Beginning of Period	45,000,000	13,000,000
Cash and Cash Equivalents at End of Period	29,000,000	188,000,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	169,000,000	156,000,000
Income taxes, net	100,000,000	44,000,000
Noncash transactions - accrued property additions at end of period	238,000,000	234,000,000
Gulf Power [Member]
Operating Activities:
Consolidated net income	57,576,000	58,730,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	77,627,000	71,707,000
Deferred income taxes	36,407,000	70,153,000
Allowance for equity funds used during construction	(2,655,000)	(2,973,000)
Pension, postretirement, and other employee benefits	5,452,000	2,383,000
Stock based compensation expense	1,028,000	1,044,000
Other, net	2,209,000	7,503,000
Changes in certain current assets and liabilities --
-Receivables	(59,770,000)	(18,580,000)
-Prepayments	1,271,000	1,813,000
-Fossil fuel stock	19,332,000	3,982,000
-Materials and supplies	(987,000)	(4,100,000)
-Prepaid income taxes	(2,822,000)	(3,566,000)
-Other current assets	13,000	0
-Accounts payable	(9,703,000)	(17,481,000)
-Accrued taxes	13,632,000	6,788,000
-Accrued compensation	(8,308,000)	(6,239,000)
-Over recovered regulatory clause revenues	(15,659,000)	25,099,000
-Other current liabilities	(1,199,000)	(1,659,000)
Net cash provided from operating activities	113,444,000	194,604,000
Investing Activities:
Property additions	(137,283,000)	(169,462,000)
Cost of removal, net of salvage	(7,010,000)	(14,817,000)
Change in construction payables	6,307,000	3,661,000
Payments pursuant to long-term service agreements	(2,855,000)	(4,086,000)
Other investing activities	120,000	18,000
Net cash used for investing activities	(140,721,000)	(184,686,000)
Financing Activities:
Increase (decrease) in notes payable, net	1,230,000	5,980,000
Proceeds --
Capital contributions from parent company	1,419,000	954,000
Pollution control revenue bonds issuances	63,000,000	0
Preference stock	50,000,000	0
Common stock issuances	40,000,000	40,000,000
Senior notes issuances	90,000,000	100,000,000
Redemptions --
Pollution control revenue bonds	(63,000,000)	0
Senior notes	0	(91,363,000)
Payment of preferred and preference stock dividends	(3,101,000)	(3,101,000)
Payment of common stock dividends	(57,700,000)	(57,900,000)
Other financing activities	(3,105,000)	(653,000)
Net cash provided from (used for) financing activities	118,743,000	(6,083,000)
Net Change in Cash and Cash Equivalents	91,466,000	3,835,000
Cash and Cash Equivalents at Beginning of Period	32,167,000	17,328,000
Cash and Cash Equivalents at End of Period	123,633,000	21,163,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	26,987,000	30,100,000
Income taxes, net	428,000	(32,848,000)
Noncash transactions - accrued property additions at end of period	29,036,000	27,127,000
Mississippi Power [Member]
Operating Activities:
Consolidated net income	(464,565,000)	61,148,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	43,263,000	43,955,000
Deferred income taxes	(337,167,000)	1,280,000
Investment tax credits	66,474,000	13,974,000
Allowance for equity funds used during construction	(55,116,000)	(25,697,000)
Pension, postretirement, and other employee benefits	6,184,000	3,993,000
Hedge settlements	0	(15,983,000)
Stock based compensation expense	1,547,000	1,344,000
Regulatory assets associated with Kemper IGCC	(13,399,000)	(6,431,000)
Estimated loss on Kemper IGCC	912,000,000	0
Kemper regulatory deferral	26,979,000	0
Other, net	1,068,000	3,783,000
Changes in certain current assets and liabilities --
-Receivables	(37,431,000)	(12,424,000)
-Fossil fuel stock	34,205,000	(32,797,000)
-Materials and supplies	(6,509,000)	212,000
-Prepaid income taxes	8,823,000	11,974,000
-Other current assets	(4,879,000)	(7,281,000)
-Accounts payable	(5,417,000)	3,408,000
-Accrued taxes	(24,101,000)	(16,785,000)
-Accrued interest	8,502,000	7,346,000
-Accrued compensation	(10,461,000)	(7,002,000)
-Over recovered regulatory clause revenues	(27,838,000)	15,871,000
-Other current liabilities	282,000	294,000
Net cash provided from operating activities	122,444,000	44,182,000
Investing Activities:
Property additions	(789,021,000)	(763,641,000)
Cost of removal, net of salvage	(2,033,000)	(1,217,000)
Change in construction payables	23,314,000	57,283,000
Capital grant proceeds	4,500,000	6,146,000
Other investing activities	(11,172,000)	(9,690,000)
Net cash used for investing activities	(774,412,000)	(711,119,000)
Proceeds --
Capital contributions from parent company	351,198,000	277,633,000
Bonds-Other	15,814,000	0
Interest-bearing refundable deposit related to asset sale	0	150,000,000
Senior notes issuances	0	400,000,000
Other long-term debt issuances	350,000,000	0
Redemptions --
Capital leases	0	(633,000)
Other long-term debt	0	(165,000,000)
Return of paid in capital	(16,424,000)	0
Payment of preferred and preference stock dividends	(866,000)	(866,000)
Payment of common stock dividends	(71,956,000)	(53,400,000)
Other financing activities	(1,431,000)	998,000
Net cash provided from (used for) financing activities	626,335,000	608,732,000
Net Change in Cash and Cash Equivalents	(25,633,000)	(58,205,000)
Cash and Cash Equivalents at Beginning of Period	145,008,000	211,585,000
Cash and Cash Equivalents at End of Period	119,375,000	153,380,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	13,423,000	16,603,000
Income taxes, net	(64,062,000)	(7,756,000)
Noncash transactions - accrued property additions at end of period	238,177,000	193,184,000
Southern Power [Member]
Operating Activities:
Consolidated net income	57,114,000	75,918,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities --
Depreciation and amortization, total	90,351,000	71,834,000
Deferred income taxes	13,693,000	58,921,000
Investment tax credits	16,443,000	1,750,000
Deferred revenues	(23,444,000)	(16,431,000)
Mark-to-market adjustments	(40,000)	(3,847,000)
Other, net	11,949,000	1,927,000
Changes in certain current assets and liabilities --
-Receivables	(23,335,000)	(30,101,000)
-Fossil fuel stock	(377,000)	(3,301,000)
-Materials and supplies	(2,560,000)	(7,761,000)
-Prepaid income taxes	(19,747,000)	(32,804,000)
-Other current assets	2,725,000	(377,000)
-Accounts payable	(7,580,000)	(494,000)
-Accrued taxes	21,048,000	13,295,000
-Accrued interest	(41,000)	409,000
-Other current liabilities	(390,000)	(195,000)
Net cash provided from operating activities	135,809,000	128,743,000
Investing Activities:
Plant acquisition	(111,600,000)	(86,500,000)
Property additions	(252,271,000)	(67,846,000)
Investment of restricted cash	(20,000,000)	3,015,000
Change in construction payables	106,795,000	(1,168,000)
Payments pursuant to long-term service agreements	(22,469,000)	(36,316,000)
Other investing activities	(206,000)	(2,862,000)
Net cash used for investing activities	(299,751,000)	(191,677,000)
Financing Activities:
Increase (decrease) in notes payable, net	195,142,000	107,147,000
Proceeds --
Capital contributions from parent company	1,394,000	490,000
Other long-term debt issuances	10,249,000	3,590,000
Redemptions --
Other long-term debt	(220,000)	(650,000)
Payment of common stock dividends	(64,560,000)	(63,500,000)
Other financing activities	8,212,000	2,746,000
Net cash provided from (used for) financing activities	150,217,000	49,823,000
Net Change in Cash and Cash Equivalents	(13,725,000)	(13,111,000)
Cash and Cash Equivalents at Beginning of Period	28,592,000	16,943,000
Cash and Cash Equivalents at End of Period	14,867,000	3,832,000
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	34,924,000	21,461,000
Income taxes, net	(3,799,000)	13,708,000
Noncash transactions - accrued property additions at end of period	$ 136,998,000	$ 46,922,000