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PROPERTY, PLANT, AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

The Registrants' property, plant, and equipment in service consisted of the following at December 31, 2021 and 2020:


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


At December 31, 2020:	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Electric utilities:
Generation	$	52,179	$	16,201	$	18,675	$	2,819	$	13,872	$	—
Transmission	12,879		5,033		6,951		856		—		—
Distribution	20,958		8,248		11,622		1,088		—		—
General/other	5,072		2,334		2,434		248		32		—
Electric utilities' plant in service	91,088		31,816		39,682		5,011		13,904		—
Southern Company Gas:
Natural gas distribution utilities transportation and distribution	14,610		—		—		—		—		14,610
Storage facilities	1,752		—		—		—		—		1,752
Other	1,249		—		—		—		—		1,249
Southern Company Gas plant in service	17,611		—		—		—		—		17,611
Other plant in service	1,817		—		—		—		—		—
Total plant in service	$	110,516	$	31,816	$	39,682	$	5,011	$	13,904	$	17,611

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 30 years

Deferred cloud implementation costs

At December 31, 2021 and 2020, deferred cloud implementation costs, 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:
At December 31, 2021	$	240	$	54	$	81	$	11	$	14	$	35
At December 31, 2020	162		38		58		7		9		17

Composite straight-line rates

Costs for these services from SCS in 2021, 2020, and 2019 were as follows:


	Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
2021	$	504	$	663	$	120	$	89	$	239
2020	478		639		149		87		237
2019	527		704		118		90		183

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)
2021	$	9	$	15
2020	4		8
2019	3		14

Transportation costs under these agreements in 2021, 2020, and 2019 were as follows:


	Alabama Power		Georgia Power		Southern Power		Southern Company Gas
	(in millions)
2021	$	14	$	108	$	31	$	29
2020	15		108		29		29
2019	17		99		28		31

The approximate rates for 2021, 2020, and 2019 are as follows:


	2021		2020		2019
Alabama Power	2.7	%	2.6	%	3.1	%
Georgia Power	3.3	%	3.0	%	2.6	%
Mississippi Power	3.6	%	3.7	%	3.7	%
Southern Company Gas	2.8	%	2.8	%	2.9	%

Ownership and investment in jointly-owned facilities

At December 31, 2021, 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	$	79	$	1
Plant Miller (coal) Units 1 and 2	91.8		(b)	2,133		665		15

Georgia Power
Plant Hatch (nuclear)	50.1	%	(c)	$	1,382	$	647	$	42
Plant Vogtle (nuclear) Units 1 and 2	45.7		(c)	3,611		2,265		86
Plant Scherer (coal) Units 1 and 2	8.4		(c)	276		100		1
Plant Scherer (coal) Unit 3	75.0		(c)	1,314		539		8
Plant Wansley (coal)	53.5		(c)	1,070		472		7
Rocky Mountain (pumped storage)	25.4		(d)	184		148		1

Mississippi Power
Greene County (natural gas) Units 1 and 2	40.0	%	(a)	$	124	$	61	$	—
Plant Daniel (coal) Units 1 and 2	50.0		(e)	762		237		19

Southern Company Gas
Dalton Pipeline (natural gas pipeline)	50.0	%	(f)	$	271	$	19	$	—

(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, Scherer, and Wansley in varying amounts jointly with one or more of the following entities: OPC, MEAG Power, Dalton, Florida Power & Light Company, JEA, and Gulf Power. 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 Gulf Power and Mississippi Power. In accordance with the operating agreement, Mississippi Power acts as Gulf Power's agent with respect to the operation and maintenance of these units. See Note 3 under "Other Matters – Mississippi Power – Plant Daniel" for information regarding a commitment between Mississippi Power and Gulf Power to seek a restructuring of their 50% undivided ownership interests in Plant Daniel.

(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.