Joint Ownership Agreements (Tables)

12 Months Ended

Dec. 31, 2012

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Jointly Owned Utility Plants [Table Text Block]

At December 31, 2012, Alabama Power's, Georgia Power's, and Southern Power's percentage ownership and investment (exclusive of nuclear fuel) in jointly-owned facilities in commercial operation with the above entities were as follows:



Facility (Type)	Percent Ownership		Plant in Service		Accumulated Depreciation		CWIP
			(in millions)
Plant Vogtle (nuclear) Units 1 and 2	45.7	%	$	3,327	$	1,996	$	67
Plant Hatch (nuclear)	50.1		1,037		551		49
Plant Miller (coal) Units 1 and 2	91.8		1,401		551		8
Plant Scherer (coal) Units 1 and 2	8.4		161		78		77
Plant Wansley (coal)	53.5		801		240		8
Rocky Mountain (pumped storage)	25.4		181		116		—
Intercession City (combustion turbine)	33.3		12		4		1
Plant Stanton (combined cycle) Unit A	65.0		156		36		—

Gulf Power [Member]

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Jointly Owned Utility Plants [Table Text Block]

At December 31, 2012, the Company's percentage ownership and investment in these jointly owned facilities were as follows:



	Plant Scherer Unit 3 (coal)				Plant Daniel Units 1 & 2 (coal)
	(in thousands)
Plant in service	$	373,576		^(a)	$	277,440
Accumulated depreciation	117,181				165,120
Construction work in progress	8,763				69,774
Ownership	25		%		50		%


(a)	Includes net plant acquisition adjustment of $2.3 million.

Georgia Power [Member]

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Jointly Owned Utility Plants [Table Text Block]

At December 31, 2012, the Company's percentage ownership and investment (exclusive of nuclear fuel) in jointly-owned facilities in commercial operation with the above entities were as follows:



Facility (Type)	Company Ownership	Plant in Service		Accumulated Depreciation		CWIP
	(in millions)
Plant Vogtle (nuclear)
Units 1 and 2	45.7%	$	3,327	$	1,996	$	67
Plant Hatch (nuclear)	50.1	1,037		551		49
Plant Wansley (coal)	53.5	801		240		8
Plant Scherer (coal)
Units 1 and 2	8.4	161		78		77
Unit 3	75.0	1,127		387		28
Rocky Mountain (pumped storage)	25.4	181		116		—
Intercession City (combustion-turbine)	33.3	12		4		1

Alabama Power [Member]

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Jointly Owned Utility Plants [Table Text Block]

In addition to the Company's ownership of SEGCO and joint ownership of the natural gas pipeline, the Company's percentage ownership and investment in jointly-owned coal-fired generating plants at December 31, 2012 were as follows:



Facility	Total Megawatt Capacity	Company Ownership		Plant in Service		Accumulated Depreciation		Construction Work in Progress
				(in millions)
Greene County	500	60.00%	⁽¹⁾	$	151	$	89	$	9
Plant Miller
Units 1 and 2	1,320	91.84%	⁽²⁾	1,401		551		8


(1)	Jointly owned with an affiliate, Mississippi Power.


(2)	Jointly owned with PowerSouth.

Mississippi Power [Member]

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Jointly Owned Utility Plants [Table Text Block]

At December 31, 2012, the Company's percentage ownership and investment in these jointly-owned facilities in commercial operation were as follows:



Generating Plant	Percent Ownership		Plant in Service		Accumulated Depreciation		Construction Work in Progress
			(in thousands)
Greene County
Units 1 and 2	40	%	$	89,474	$	45,402	$	4,386
Daniel
Units 1 and 2	50	%	$	293,451	$	147,833	$	73,534

- Definition

Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants.

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