SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Schedule of costs for affiliate transactions

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	%

Schedule of total AFUDC and interest capitalized

Total AFUDC and interest capitalized for the Registrants in 2022, 2021, and 2020 was as follows:

	Southern Company		Alabama Power		Georgia Power(*)		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
2022	$	327	$	90	$	213	$	—	$	—	$	24
2021	282		68		190		—		6		18
2020	230		61		138		1		11		18

(*)See Note 2 under "Georgia Power – Nuclear Construction" for information on the inclusion of a portion of construction costs related to Plant Vogtle Units 3 and 4 in Georgia Power's rate base.

Schedule of average AFUDC composite rates

The average AFUDC composite rates for 2022, 2021, and 2020 for the traditional electric operating companies and the natural gas distribution utilities were as follows:

	2022		2021		2020
Alabama Power	7.9	%	7.9	%	8.1	%
Georgia Power(*)	7.3	%	7.2	%	6.9	%
Mississippi Power	5.3	%	2.5	%	5.4	%
Southern Company Gas:
Atlanta Gas Light	7.6	%	7.7	%	7.7	%
Chattanooga Gas	7.1	%	7.1	%	7.1	%
Nicor Gas	2.0	%	0.1	%	0.7	%

(*)Excludes AFUDC related to the construction of Plant Vogtle Units 3 and 4. See Note 2 under "Georgia Power – Nuclear Construction" for additional information.

Schedule of goodwill balances

At December 31, 2022 and 2021, goodwill was as follows:

	At December 31, 2022		At December 31, 2021
	(in millions)
Southern Company	$	5,161	$	5,280
Southern Company Gas:
Gas distribution operations	$	4,034	$	4,034
Gas marketing services	981		981
Southern Company Gas total	$	5,015	$	5,015

Schedule of intangible assets subject to amortization

At December 31, 2022 and 2021, other intangible assets were as follows:

	At December 31, 2022						At December 31, 2021
	Gross Carrying Amount		Accumulated Amortization		Other Intangible Assets, Net		Gross Carrying Amount		Accumulated Amortization		Other Intangible Assets, Net
	(in millions)						(in millions)
Southern Company
Subject to amortization:
Customer relationships	$	212	$	(162)	$	50	$	212	$	(150)	$	62
Trade names	64		(44)		20		64		(38)		26
PPA fair value adjustments	390		(129)		261		390		(109)		281
Other	5		(5)		—		11		(10)		1
Total subject to amortization	$	671	$	(340)	$	331	$	677	$	(307)	$	370
Not subject to amortization:
FCC licenses	75		—		75		75		—		75
Total other intangible assets	$	746	$	(340)	$	406	$	752	$	(307)	$	445
Southern Power(*)
PPA fair value adjustments	$	390	$	(129)	$	261	$	390	$	(109)	$	281
Southern Company Gas(*)
Gas marketing services
Customer relationships	$	156	$	(139)	$	17	$	156	$	(130)	$	26
Trade names	26		(17)		9		26		(15)		11
Total other intangible assets	$	182	$	(156)	$	26	$	182	$	(145)	$	37

(*)All subject to amortization.

Schedule of intangible assets not subject to amortization

At December 31, 2022 and 2021, other intangible assets were as follows:

	At December 31, 2022						At December 31, 2021
	Gross Carrying Amount		Accumulated Amortization		Other Intangible Assets, Net		Gross Carrying Amount		Accumulated Amortization		Other Intangible Assets, Net
	(in millions)						(in millions)
Southern Company
Subject to amortization:
Customer relationships	$	212	$	(162)	$	50	$	212	$	(150)	$	62
Trade names	64		(44)		20		64		(38)		26
PPA fair value adjustments	390		(129)		261		390		(109)		281
Other	5		(5)		—		11		(10)		1
Total subject to amortization	$	671	$	(340)	$	331	$	677	$	(307)	$	370
Not subject to amortization:
FCC licenses	75		—		75		75		—		75
Total other intangible assets	$	746	$	(340)	$	406	$	752	$	(307)	$	445
Southern Power(*)
PPA fair value adjustments	$	390	$	(129)	$	261	$	390	$	(109)	$	281
Southern Company Gas(*)
Gas marketing services
Customer relationships	$	156	$	(139)	$	17	$	156	$	(130)	$	26
Trade names	26		(17)		9		26		(15)		11
Total other intangible assets	$	182	$	(156)	$	26	$	182	$	(145)	$	37

(*)All subject to amortization.

Schedule of amortization associated with other intangible assets

Amortization associated with other intangible assets in 2022, 2021, and 2020 was as follows:

	2022		2021		2020
	(in millions)
Southern Company(a)	$	39	$	44	$	49
Southern Power(b)	20		20		20
Southern Company Gas:
Gas marketing services	$	11	$	15	$	17
Wholesale gas services(b)	—		—		2
Southern Company Gas total	$	11	$	15	$	19

(a)Includes $20 million, $20 million, and $22 million in 2022, 2021, and 2020, respectively, recorded as a reduction to operating revenues.

(b)Recorded as a reduction to operating revenues.

Schedule of estimated future amortization of other intangible assets

At December 31, 2022, the estimated amortization associated with other intangible assets for the next five years is as follows:

	2023		2024		2025		2026		2027
	(in millions)
Southern Company	$	36	$	35	$	31	$	26	$	23
Southern Power	20		20		20		20		20
Southern Company Gas	9		8		6		3		—

Schedule of cash, cash equivalents, and restricted cash

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets that total to the amount shown in the statements of cash flows for the applicable Registrants:

	Southern Company				Georgia Power		Southern Power				Southern Company Gas
	December 31,
	2022		2021		2022		2022		2021		2022		2021
	(in millions)						(in millions)				(in millions)
Cash and cash equivalents	$	1,917	$	1,798	$	364	$	131	$	107	$	81	$	45
Restricted cash(a):
Other current assets	62		2		60		—		—		2		2
Other deferred charges and assets	58		29		56		3		29		—		—
Total cash, cash equivalents, and restricted cash(b)	$	2,037	$	1,829	$	480	$	133	$	135	$	83	$	48

(a)For Georgia Power, reflects proceeds from the issuance of solid waste disposal facility revenue bonds. See Note 8 under "Long-term Debt" for additional information. Georgia Power did not have any restricted cash at December 31, 2021. For Southern Power, reflects $3 million and $10 million at December 31, 2022 and 2021, respectively, held to fund estimated construction completion costs at the Deuel Harvest wind facility and $19 million at December 31, 2021 related to tax equity contributions restricted until the Garland battery energy storage facility achieved final contracted capacity. See Note 15 under "Southern Power" for additional information. For Southern Company Gas, reflects collateral for workers' compensation, life insurance, and long-term disability insurance.

(b)Total may not add due to rounding.

Reconciliation of restricted cash and cash equivalents

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets that total to the amount shown in the statements of cash flows for the applicable Registrants:

	Southern Company				Georgia Power		Southern Power				Southern Company Gas
	December 31,
	2022		2021		2022		2022		2021		2022		2021
	(in millions)						(in millions)				(in millions)
Cash and cash equivalents	$	1,917	$	1,798	$	364	$	131	$	107	$	81	$	45
Restricted cash(a):
Other current assets	62		2		60		—		—		2		2
Other deferred charges and assets	58		29		56		3		29		—		—
Total cash, cash equivalents, and restricted cash(b)	$	2,037	$	1,829	$	480	$	133	$	135	$	83	$	48

(a)For Georgia Power, reflects proceeds from the issuance of solid waste disposal facility revenue bonds. See Note 8 under "Long-term Debt" for additional information. Georgia Power did not have any restricted cash at December 31, 2021. For Southern Power, reflects $3 million and $10 million at December 31, 2022 and 2021, respectively, held to fund estimated construction completion costs at the Deuel Harvest wind facility and $19 million at December 31, 2021 related to tax equity contributions restricted until the Garland battery energy storage facility achieved final contracted capacity. See Note 15 under "Southern Power" for additional information. For Southern Company Gas, reflects collateral for workers' compensation, life insurance, and long-term disability insurance.

(b)Total may not add due to rounding.

Schedule of storm damage reserves

In accordance with their respective state PSC orders, the traditional electric operating companies accrued the following amounts related to storm damage recovery in 2022, 2021, and 2020:

	Southern Company(*)		Alabama Power		Georgia Power		Mississippi Power(*)
	(in millions)
2022	$	239	$	19	$	213	$	7
2021	286		75		213		(2)
2020	326		112		213		1

(*)Mississippi Power's net accrual includes carrying costs, as well as amortization of related excess deferred income tax benefits.

During 2022, Alabama Power and Mississippi Power accrued the following amounts to their reliability reserves:

	Southern Company		Alabama Power		Mississippi Power
	(in millions)
2022	$	191	$	166	$	25

Schedule of AOCI (loss) balances, net of tax effects

AOCI (loss) balances, net of tax effects, for Southern Company, Southern Power, and Southern Company Gas were as follows:

	Qualifying Hedges		Pension and Other Postretirement Benefit Plans		Accumulated Other Comprehensive Income (Loss)(*)
	(in millions)
Southern Company
Balance at December 31, 2021	$	(162)	$	(76)	$	(237)
Current period change	13		58		71
Balance at December 31, 2022	$	(149)	$	(18)	$	(167)
Southern Power
Balance at December 31, 2021	$	1	$	(29)	$	(27)
Current period change	(10)		20		10
Balance at December 31, 2022	$	(9)	$	(9)	$	(18)
Southern Company Gas
Balance at December 31, 2021	$	(14)	$	38	$	24
Current period change	(11)		18		7
Balance at December 31, 2022	$	(25)	$	56	$	31

(*)May not add due to rounding.