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PROPERTY, PLANT, AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

The Registrants' property, plant, and equipment in service consisted of the following at December 31, 2024 and 2023:


At December 31, 2024:	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Electric utilities:
Generation	$	61,292	$	16,801	$	26,089	$	2,946	$	14,920	$	—
Transmission	16,280		6,449		8,800		989		—		—
Distribution	28,678		10,373		16,887		1,418		—		—
General/other	6,547		2,878		3,260		344		41		—
Electric utilities' plant in service	112,797		36,501		55,036		5,697		14,961		—
Southern Company Gas:
Natural gas transportation and distribution	18,896		—		—		—		—		18,896
Storage facilities	1,748		—		—		—		—		1,748
Other	1,694		—		—		—		—		1,694
Southern Company Gas plant in service	22,338		—		—		—		—		22,338
Other plant in service	2,008		—		—		—		—		—
Total plant in service	$	137,143	$	36,501	$	55,036	$	5,697	$	14,961	$	22,338


At December 31, 2023:	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Electric utilities:
Generation	$	57,325	$	16,584	$	22,587	$	2,909	$	14,649	$	—
Transmission	15,561		6,152		8,402		966		—		—
Distribution	26,482		9,775		15,380		1,327		—		—
General/other	6,305		2,918		3,001		321		41		—
Electric utilities' plant in service	105,673		35,429		49,370		5,523		14,690		—
Southern Company Gas:
Natural gas transportation and distribution	17,798		—		—		—		—		17,798
Storage facilities	1,565		—		—		—		—		1,565
Other	1,477		—		—		—		—		1,477
Southern Company Gas plant in service	20,840		—		—		—		—		20,840
Other plant in service	1,915		—		—		—		—		—
Total plant in service	$	128,428	$	35,429	$	49,370	$	5,523	$	14,690	$	20,840

The primary assets in Southern Power's property, plant, and equipment are generating facilities, which generally have estimated useful lives as follows:


Southern Power Generating Facility			Useful life
Natural gas			Up to 50 years
Solar			Up to 35 years
Wind			Up to 35 years

Deferred cloud implementation costs

At December 31, 2024 and 2023, deferred cloud implementation costs, net of amortization, which are generally included in other deferred charges and assets on the Registrants' balance sheets, were as follows:


	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Deferred cloud implementation costs, net:
At December 31, 2024	$	321	$	92	$	111	$	13	$	12	$	35
At December 31, 2023	325		85		99		13		15		43

Amortization of deferred cloud implementation costs recognized in 2024, 2023, and 2022 was immaterial for Mississippi Power, Southern Power, and Southern Company Gas and was as follows for the other Registrants:


	Southern Company		Alabama Power		Georgia Power
	(in millions)
2024	$	56	$	17	$	22
2023	46		11		19
2022	29		8		12

Composite straight-line rates

Costs for these services from SCS in 2024, 2023, and 2022 were as follows:


	Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
2024	$	813	$	1,197	$	130	$	93	$	290
2023	611		857		113		86		261
2022	549		762		115		86		262

Mississippi Power's and Southern Power's power purchases from affiliates through the Southern Company power pool are included in purchased power on their respective statements of income and were as follows:


	Mississippi Power		Southern Power
	(in millions)
2024	$	8	$	17
2023	4		13
2022	4		29

Transportation costs under these agreements in 2024, 2023, and 2022 were as follows:


	Alabama Power		Georgia Power		Southern Power		Southern Company Gas
	(in millions)
2024	$	13	$	103	$	35	$	28
2023	12		101		34		28
2022	18		99		37		27

The approximate rates for 2024, 2023, and 2022 were as follows:


	2024		2023		2022
Alabama Power	4.2	%	4.1	%	2.7	%
Georgia Power	3.4	%	3.8	%	3.3	%
Mississippi Power	3.3	%	3.4	%	3.4	%
Southern Company Gas	2.9	%	2.7	%	2.7	%

Ownership and investment in jointly-owned facilities

At December 31, 2024, the Registrants' percentage ownership and investment (exclusive of nuclear fuel) in jointly-owned facilities in commercial operation were as follows:


Facility (Type)	Percent Ownership			Plant in Service		Accumulated Depreciation		CWIP
				(in millions)
Alabama Power
Plant Greene County (natural gas) Units 1 and 2	60.0	%	(a)	$	192	$	140	$	1
Plant Miller (coal) Units 1 and 2	91.8		(b)	2,180		829		7

Georgia Power
Plant Hatch (nuclear) Units 1 and 2	50.1	%	(c)	$	1,464	$	604	$	66
Plant Vogtle (nuclear) Units 1 and 2	45.7		(c)	3,621		2,342		162
Plant Vogtle (nuclear) Units 3 and 4	45.7		(c)	7,953		119		45
Plant Scherer (coal) Units 1 and 2	8.4		(c)	289		140		4
Plant Scherer (coal) Unit 3	75.0		(c)	1,316		720		22
Rocky Mountain (pumped storage)	25.4		(d)	182		160		6

Mississippi Power
Plant Greene County (natural gas) Units 1 and 2	40.0	%	(a)	$	125	$	88	$	2
Plant Daniel (coal) Units 1 and 2	50.0		(e)	791		286		3

Southern Company Gas
Dalton Pipeline (natural gas pipeline)	50.0	%	(f)	$	271	$	32	$	1

(a)Jointly owned by Alabama Power and Mississippi Power and operated and maintained by Alabama Power.

(b)Jointly owned with PowerSouth and operated and maintained by Alabama Power.

(c)Georgia Power owns undivided interests in Plants Hatch, Vogtle, and Scherer in varying amounts jointly with one or more of the following entities: OPC, MEAG Power, Dalton, FP&L, and Jacksonville Electric Authority. Georgia Power has been contracted to operate and maintain the plants as agent for the co-owners and is jointly and severally liable for third-party claims related to these plants.

(d)Jointly owned with OPC, which is the operator of the plant.

(e)Jointly owned with FP&L. In accordance with the operating agreement, Mississippi Power acts as FP&L's agent with respect to the operation and maintenance of these units. See Note 2 under "Mississippi Power – Plant Daniel" for information on Mississippi Power's agreement with FP&L to acquire FP&L's 50% ownership interest in Plant Daniel Units 1 and 2.

(f)Jointly owned with The Williams Companies, Inc., the Dalton Pipeline is a 115-mile natural gas pipeline that serves as an extension of the Transcontinental Gas Pipe Line Company, LLC pipeline system into northwest Georgia. Southern Company Gas leases its 50% undivided ownership for approximately $26 million annually through 2042. The lessee is responsible for maintaining the pipeline during the lease term and for providing service to transportation customers under its FERC-regulated tariff.