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PROPERTY, PLANT, AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

The Registrants' property, plant, and equipment in service consisted of the following at December 31, 2023 and 2022:


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


At December 31, 2022:	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Electric utilities:
Generation	$	51,756	$	15,920	$	17,755	$	2,826	$	14,619	$	—
Transmission	14,201		5,658		7,576		927		—		—
Distribution	24,200		9,154		13,819		1,228		—		—
General/other	5,806		2,740		2,729		273		39		—
Electric utilities' plant in service	95,963		33,472		41,879		5,254		14,658		—
Southern Company Gas:
Natural gas transportation and distribution	16,810		—		—		—		—		16,810
Storage facilities	1,553		—		—		—		—		1,553
Other	1,360		—		—		—		—		1,360
Southern Company Gas plant in service	19,723		—		—		—		—		19,723
Other plant in service	1,843		—		—		—		—		—
Total plant in service	$	117,529	$	33,472	$	41,879	$	5,254	$	14,658	$	19,723

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, 2023 and 2022, deferred cloud implementation costs, net of amortization, which are generally included in other deferred charges and assets on the Registrants' balance sheets, are 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, 2023	$	325	$	85	$	99	$	13	$	15	$	43
At December 31, 2022	345		81		108		14		18		54

Composite straight-line rates

Costs for these services from SCS in 2023, 2022, and 2021 were as follows:


	Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
2023	$	611	$	857	$	113	$	86	$	261
2022	549		762		115		86		262
2021	504		663		120		89		239

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)
2023	$	4	$	13
2022	4		29
2021	9		15

Transportation costs under these agreements in 2023, 2022, and 2021 were as follows:


	Alabama Power		Georgia Power		Southern Power		Southern Company Gas
	(in millions)
2023	$	12	$	101	$	34	$	28
2022	18		99		37		27
2021	14		108		31		29

The approximate rates for 2023, 2022, and 2021 are as follows:


	2023		2022		2021
Alabama Power	4.1	%	2.7	%	2.7	%
Georgia Power	3.8	%	3.3	%	3.3	%
Mississippi Power	3.4	%	3.4	%	3.6	%
Southern Company Gas	2.7	%	2.7	%	2.8	%

Ownership and investment in jointly-owned facilities

At December 31, 2023, 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
Greene County (natural gas) Units 1 and 2	60.0	%	(a)	$	191	$	113	$	1
Plant Miller (coal) Units 1 and 2	91.8		(b)	2,156		778		40

Georgia Power
Plant Hatch (nuclear) Units 1 and 2	50.1	%	(c)	$	1,446	$	659	$	70
Plant Vogtle (nuclear) Units 1 and 2	45.7		(c)	3,664		2,331		62
Plant Vogtle (nuclear) Units 3 and 4	45.7		(c)(d)	4,613		19		3,232
Plant Scherer (coal) Units 1 and 2	8.4		(c)	287		123		2
Plant Scherer (coal) Unit 3	75.0		(c)	1,310		639		10
Rocky Mountain (pumped storage)	25.4		(e)	181		153		—

Mississippi Power
Greene County (natural gas) Units 1 and 2	40.0	%	(a)	$	125	$	80	$	—
Plant Daniel (coal) Units 1 and 2	50.0		(f)	805		281		1

Southern Company Gas
Dalton Pipeline (natural gas pipeline)	50.0	%	(g)	$	271	$	27	$	—

(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 JEA. 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)Unit 4 remains under construction. See Note 2 under "Georgia Power – Nuclear Construction" for additional information.

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

(f)Jointly owned by FP&L and Mississippi Power. 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 3 under "Other Matters – Mississippi Power – Plant Daniel" for additional information.

(g)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.