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PROPERTY, PLANT, AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

The Registrants' property, plant, and equipment in service consisted of the following at December 31, 2022 and 2021:


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 distribution utilities 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


At December 31, 2021:	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Electric utilities:
Generation	$	53,803	$	16,631	$	19,184	$	2,791	$	14,551	$	—
Transmission	13,406		5,334		7,132		900		—		—
Distribution	22,236		8,643		12,437		1,156		—		—
General/other	5,423		2,527		2,579		259		34		—
Electric utilities' plant in service	94,868		33,135		41,332		5,106		14,585		—
Southern Company Gas:
Natural gas distribution utilities transportation and distribution	15,714		—		—		—		—		15,714
Storage facilities	1,315		—		—		—		—		1,315
Other	1,851		—		—		—		—		1,851
Southern Company Gas plant in service	18,880		—		—		—		—		18,880
Other plant in service	1,844		—		—		—		—		—
Total plant in service	$	115,592	$	33,135	$	41,332	$	5,106	$	14,585	$	18,880

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(*)

(*)Effective January 1, 2022, Southern Power revised the depreciable lives of its wind generating facilities from up to 30 years to up to 35 years. This revision resulted in an immaterial decrease in depreciation for 2022.

Deferred cloud implementation costs

At December 31, 2022 and 2021, 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, 2022	$	345	$	81	$	108	$	14	$	18	$	54
At December 31, 2021	240		54		81		11		14		35

Composite straight-line rates

Costs for these services from SCS in 2022, 2021, and 2020 were as follows:


	Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
2022	$	549	$	762	$	115	$	86	$	262
2021	504		663		120		89		239
2020	478		639		149		87		237

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)
2022	$	4	$	29
2021	9		15
2020	4		8

Transportation costs under these agreements in 2022, 2021, and 2020 were as follows:


	Alabama Power		Georgia Power		Southern Power		Southern Company Gas
	(in millions)
2022	$	18	$	99	$	37	$	27
2021	14		108		31		29
2020	15		108		29		29

The approximate rates for 2022, 2021, and 2020 are as follows:


	2022		2021		2020
Alabama Power	2.7	%	2.7	%	2.6	%
Georgia Power	3.3	%	3.3	%	3.0	%
Mississippi Power	3.4	%	3.6	%	3.7	%
Southern Company Gas	2.7	%	2.8	%	2.8	%

Ownership and investment in jointly-owned facilities

At December 31, 2022, 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)	$	193	$	85	$	—
Plant Miller (coal) Units 1 and 2	91.8		(b)	2,148		712		13

Georgia Power
Plant Hatch (nuclear)	50.1	%	(c)	$	1,401	$	671	$	62
Plant Vogtle (nuclear) Units 1 and 2	45.7		(c)	3,628		2,298		94
Plant Scherer (coal) Units 1 and 2	8.4		(c)	276		106		1
Plant Scherer (coal) Unit 3	75.0		(c)	1,317		567		6
Rocky Mountain (pumped storage)	25.4		(d)	184		153		1

Mississippi Power
Greene County (natural gas) Units 1 and 2	40.0	%	(a)	$	125	$	70	$	—
Plant Daniel (coal) Units 1 and 2	50.0		(e)	765		257		30

Southern Company Gas
Dalton Pipeline (natural gas pipeline)	50.0	%	(f)	$	271	$	23	$	—

(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 Units 1 and 2, 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)Jointly owned with OPC, which is the operator of the plant.

(e)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.

(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.