The Southern Company (SO) 10-K 19 Feb 25 2024 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Jan. 31, 2025	Jun. 30, 2024
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-3526
Entity Registrant Name	The Southern Company
Entity Tax Identification Number	58-0690070
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	30 Ivan Allen Jr. Boulevard, N.W.
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30308
City Area Code	404
Local Phone Number	506-5000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 84.9
Entity Common Stock, Shares Outstanding (in shares)		1,096,802,197
Documents Incorporated by Reference	specified portions of The Southern Company's Definitive Proxy Statement on Schedule 14A relating to the 2025 Annual Meeting of Stockholders are incorporated by reference into PART III. Each of Alabama Power Company, Georgia Power Company, Mississippi Power Company, Southern Power Company, and Southern Company Gas meets the conditions set forth in General Instructions I(1)(a) and (b) of Form 10-K and is therefore filing this Form 10-K with the reduced disclosure format specified in General Instructions I(2)(b), (c), and (d) of Form 10-K. This combined Form 10-K is separately filed by The Southern Company, Alabama Power Company, Georgia Power Company, Mississippi Power Company, Southern Power Company, and Southern Company Gas. Information contained herein relating to any individual registrant is filed by such registrant on its own behalf. Each registrant makes no representation as to information relating to the other registrants.
Entity Central Index Key	0000092122
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Common Stock, par value $5 per share
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $5 per share
Trading Symbol	SO
Security Exchange Name	NYSE
Series 2017B 5.25% Junior Subordinated Notes due 2077
Document Information [Line Items]
Title of 12(b) Security	Series 2017B 5.25% Junior Subordinated Notes due 2077
Trading Symbol	SOJC
Security Exchange Name	NYSE
Series 2020A 4.95% Junior Subordinated Notes due 2080
Document Information [Line Items]
Title of 12(b) Security	Series 2020A 4.95% Junior Subordinated Notes due 2080
Trading Symbol	SOJD
Security Exchange Name	NYSE
Series 2020C 4.20% Junior Subordinated Notes due 2060
Document Information [Line Items]
Title of 12(b) Security	Series 2020C 4.20% Junior Subordinated Notes due 2060
Trading Symbol	SOJE
Security Exchange Name	NYSE
Series 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081
Document Information [Line Items]
Title of 12(b) Security	Series 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081
Trading Symbol	SO 81
Security Exchange Name	NYSE
Series 2025A 6.50% Junior Subordinated Notes due 2085
Document Information [Line Items]
Title of 12(b) Security	Series 2025A 6.50% Junior Subordinated Notes due 2085
Trading Symbol	SOJF
Security Exchange Name	NYSE
Alabama Power
Document Information [Line Items]
Entity File Number	1-3164
Entity Registrant Name	Alabama Power Company
Entity Tax Identification Number	63-0004250
Entity Incorporation, State or Country Code	AL
Entity Address, Address Line One	600 North 18th Street
Entity Address, City or Town	Birmingham
Entity Address, State or Province	AL
Entity Address, Postal Zip Code	35203
City Area Code	205
Local Phone Number	257-1000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		30,537,500
Entity Central Index Key	0000003153
Georgia Power
Document Information [Line Items]
Entity File Number	1-6468
Entity Registrant Name	Georgia Power Company
Entity Tax Identification Number	58-0257110
Entity Incorporation, State or Country Code	GA
Entity Address, Address Line One	241 Ralph McGill Boulevard, N.E.
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30308
City Area Code	404
Local Phone Number	506-6526
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		9,261,500
Entity Central Index Key	0000041091
Georgia Power | Series 2017A 5.00% Junior Subordinated Notes due 2077
Document Information [Line Items]
Title of 12(b) Security	Series 2017A 5.00% Junior Subordinated Notes due 2077
Trading Symbol	GPJA
Security Exchange Name	NYSE
Mississippi Power
Document Information [Line Items]
Entity File Number	001-11229
Entity Registrant Name	Mississippi Power Company
Entity Tax Identification Number	64-0205820
Entity Incorporation, State or Country Code	MS
Entity Address, Address Line One	2992 West Beach Boulevard
Entity Address, City or Town	Gulfport
Entity Address, State or Province	MS
Entity Address, Postal Zip Code	39501
City Area Code	228
Local Phone Number	864-1211
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		1,121,000
Entity Central Index Key	0000066904
Southern Power
Document Information [Line Items]
Entity File Number	001-37803
Entity Registrant Name	Southern Power Company
Entity Tax Identification Number	58-2598670
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	30 Ivan Allen Jr. Boulevard, N.W.
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30308
City Area Code	404
Local Phone Number	506-5000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		1,000
Entity Central Index Key	0001160661
Southern Power | Series 2016B 1.850% Senior Notes due 2026
Document Information [Line Items]
Title of 12(b) Security	Series 2016B 1.850% Senior Notes due 2026
Trading Symbol	SO/26A
Security Exchange Name	NYSE
Southern Company Gas
Document Information [Line Items]
Entity File Number	1-14174
Entity Registrant Name	Southern Company Gas
Entity Tax Identification Number	58-2210952
Entity Incorporation, State or Country Code	GA
Entity Address, Address Line One	Ten Peachtree Place, N.E.
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30309
City Area Code	404
Local Phone Number	584-4000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		100
Entity Central Index Key	0001004155

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Auditor [Line Items]
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Atlanta, Georgia
Alabama Power
Auditor [Line Items]
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Birmingham, Alabama
Georgia Power
Auditor [Line Items]
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Atlanta, Georgia
Mississippi Power
Auditor [Line Items]
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Atlanta, Georgia
Southern Power
Auditor [Line Items]
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Atlanta, Georgia
Southern Company Gas
Auditor [Line Items]
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Atlanta, Georgia
Southern Natural Gas Company, LLC
Auditor [Line Items]
Auditor Name	BDO USA, P.C.
Auditor Firm ID	243
Auditor Location	Houston, Texas

Consolidated Statements of Inco

Consolidated Statements of Income - Southern - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Revenues:
Total operating revenues	$ 26,724	$ 25,253	$ 29,279
Operating Expenses:
Other operations and maintenance	6,539	6,093	6,824
Depreciation and amortization	4,755	4,525	3,663
Taxes other than income taxes	1,540	1,425	1,411
Estimated loss on Plant Vogtle Units 3 and 4	(21)	(68)	183
Total operating expenses	19,656	19,427	23,909
Operating Income	7,068	5,826	5,370
Other Income and (Expense):
Allowance for equity funds used during construction	235	268	224
Earnings from equity method investments	139	144	151
Interest expense, net of amounts capitalized	(2,743)	(2,446)	(2,022)
Other income (expense), net	530	553	500
Total other income and (expense)	(1,839)	(1,481)	(1,147)
Earnings Before Income Taxes	5,229	4,345	4,223
Income taxes (benefit)	969	496	795
Net Income	4,260	3,849	3,428
Dividends on preferred stock of subsidiaries	0	0	11
Net loss attributable to noncontrolling interests	(141)	(127)	(107)
Consolidated Net Income	$ 4,401	$ 3,976	$ 3,524
Earnings per share —
Basic (in dollars per share)	$ 4.02	$ 3.64	$ 3.28
Diluted (in dollars per share)	$ 3.99	$ 3.62	$ 3.26
Average number of shares of common stock outstanding — (in millions)
Basic (in shares)	1,096	1,092	1,075
Diluted (in shares)	1,102	1,098	1,081
Retail electric revenues
Operating Revenues:
Total operating revenues	$ 17,790	$ 16,343	$ 18,197
Wholesale electric revenues
Operating Revenues:
Total operating revenues	2,431	2,467	3,641
Other electric revenues
Operating Revenues:
Total operating revenues	896	792	747
Natural gas revenues
Operating Revenues:
Total operating revenues	4,456	4,702	5,962
Other revenues
Operating Revenues:
Total operating revenues	1,151	949	732
Operating Expenses:
Cost of sales	668	560	396
Fuel
Operating Expenses:
Cost of sales	4,096	4,365	6,835
Purchased power
Operating Expenses:
Cost of sales	883	883	1,593
Natural gas
Operating Expenses:
Cost of sales	$ 1,196	$ 1,644	$ 3,004

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - Southern - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 4,260	$ 3,849	$ 3,428
Qualifying hedges:
Changes in fair value, net of tax	(5)	(41)	(60)
Reclassification adjustment for amounts included in net income, net of tax	80	69	73
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	23	(39)	48
Reclassification adjustment for amounts included in net income, net of tax	1	1	10
Total other comprehensive income (loss)	99	(10)	71
Dividends on preferred stock of subsidiaries	0	0	11
Comprehensive loss attributable to noncontrolling interests	(141)	(127)	(107)
Comprehensive Income	$ 4,500	$ 3,966	$ 3,595

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income - Southern (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Qualifying hedges, change in fair value, tax	$ (2)	$ (17)	$ (19)
Qualifying hedges, reclassification adjustment, tax	28	27	23
Pension and other postretirement benefit plans, gain (loss), tax	10	(14)	18
Reclassification adjustment for amounts included in net income, tax	$ 0	$ 0	$ 3

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - Southern - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Consolidated net income	$ 4,260	$ 3,849	$ 3,428
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	5,266	4,986	4,064
Deferred income taxes	536	63	670
Utilization of federal tax credit carryforward	90	353	88
Allowance for equity funds used during construction	(235)	(268)	(224)
Pension, postretirement, and other employee benefits	(556)	(527)	(436)
Settlement of asset retirement obligations	(566)	(617)	(455)
Storm damage and reliability reserve accruals	163	124	430
Stock based compensation expense	132	137	127
Estimated loss on Plant Vogtle Units 3 and 4	(21)	(68)	183
Retail fuel cost under recovery – long-term	(32)	(206)	(2,166)
Natural gas cost under recovery – long-term	0	0	207
Storm damage cost recovery – long-term	(631)	0	0
Other, net	(39)	(138)	226
Changes in certain current assets and liabilities —
-Receivables	(372)	482	(771)
-Retail fuel cost under recovery	984	686	(100)
-Fossil fuel for generation	140	(368)	(125)
-Materials and supplies	(189)	(345)	(160)
-Natural gas cost under recovery	0	108	158
-Other current assets	(47)	(106)	(186)
-Accounts payable	492	(863)	1,021
-Customer refunds	83	(157)	119
-Natural gas cost over recovery	(21)	214	0
-Other current liabilities	145	191	153
Net cash provided from operating activities	9,788	7,553	6,302
Investing Activities:
Property additions	(8,955)	(9,095)	(7,923)
Nuclear decommissioning trust fund purchases	(1,551)	(1,142)	(1,125)
Nuclear decommissioning trust fund sales	1,535	1,121	1,112
Proceeds from dispositions	369	164	275
Cost of removal, net of salvage	(632)	(592)	(649)
Change in construction payables, net	106	18	203
Payments pursuant to LTSAs	(108)	(99)	(190)
Other investing activities	(164)	(43)	(133)
Net cash used for investing activities	(9,400)	(9,668)	(8,430)
Financing Activities:
Increase (decrease) in notes payable, net	(648)		(337)
Increase (decrease) in notes payable, net		973
Proceeds —
Long-term debt	6,159	8,972	5,132
Short-term borrowings	700	350	2,650
Common stock	143	36	1,808
Redemptions and repurchases —
Long-term debt	(2,222)	(4,294)	(2,158)
Short-term borrowings	(1,020)	(1,630)	(1,150)
Preferred stock	0	0	(298)
Distributions to noncontrolling interests	(185)	(234)	(259)
Payment of common stock dividends	(2,954)	(3,035)	(2,907)
Other financing activities	(181)	(139)	(145)
Net cash provided from (used for) financing activities	(208)	999	2,336
Net Change in Cash, Cash Equivalents, and Restricted Cash	180	(1,116)	208
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	921	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Year	1,101	921	2,037
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	2,538	2,184	1,758
Income taxes, net (excludes credit transfers)	176	132	146
Noncash transactions —
Accrued property additions at year-end	1,199	1,027	1,024
LTSA credits utilized from the sale of spare parts	13	23	0
Contributions from noncontrolling interests	0	0	15
Issuance of common stock under dividend reinvestment plan	$ 179	$ 0	$ 0

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows - Southern (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Net cash paid for capitalized interest	$ 103	$ 132	$ 103

Consolidated Balance Sheets - S

Consolidated Balance Sheets - Southern - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 1,070	$ 748
Receivables —
Customer accounts	2,228	2,030
Unbilled revenues	825	786
Under recovered fuel clause revenues	713	696
Other accounts and notes	597	519
Accumulated provision for uncollectible accounts	(74)	(68)
Materials and supplies	2,178	1,989
Fossil fuel for generation	803	943
Natural gas for sale	388	420
Prepaid expenses	294	406
Assets from risk management activities, net of collateral	39	36
Regulatory assets – asset retirement obligations	353	274
Other regulatory assets	804	1,120
Other current assets	476	533
Total current assets	10,694	10,432
Property, Plant, and Equipment:
In service	137,143	128,428
Less: Accumulated depreciation	40,126	37,725
Plant in service, net of depreciation	97,017	90,703
Other utility plant, net	410	499
Nuclear fuel, at amortized cost	873	858
Construction work in progress	6,389	7,784
Total property, plant, and equipment	104,689	99,844
Other Property and Investments:
Goodwill	5,161	5,161
Nuclear decommissioning trusts, at fair value	2,621	2,424
Equity investments in unconsolidated subsidiaries	1,416	1,368
Other intangible assets, net of amortization	332	368
Miscellaneous property and investments	668	665
Other Property and Investments	10,198	9,986
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,386	1,432
Deferred charges related to income taxes	889	886
Prepaid pension costs	2,674	2,079
Unamortized loss on reacquired debt	203	220
Deferred under recovered retail fuel clause revenues	485	1,261
Regulatory assets – asset retirement obligations, deferred	5,458	5,459
Other regulatory assets, deferred	7,037	6,264
Other deferred charges and assets	1,467	1,468
Total deferred charges and other assets	19,599	19,069
Total Assets	145,180	139,331
Current Liabilities:
Securities due within one year	4,718	2,476
Notes payable	1,338	2,314
Accounts payable	3,701	2,898
Customer deposits	486	503
Accrued taxes —
Accrued income taxes	57	8
Other accrued taxes	997	860
Accrued interest	682	652
Accrued compensation	1,261	1,151
Asset retirement obligations	731	744
Liabilities from risk management activities, net of collateral	160	294
Operating lease obligations	200	183
Natural gas cost over recovery	193	214
Other regulatory liabilities	369	141
Other current liabilities	1,100	1,029
Total current liabilities	15,993	13,467
Long-Term Debt	58,768	57,210
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	11,730	10,990
Deferred credits related to income taxes	4,434	4,674
Accumulated deferred ITCs	2,056	2,067
Employee benefit obligations	1,011	1,115
Operating lease obligations, deferred	1,253	1,307
Asset retirement obligations, deferred	9,203	9,573
Other cost of removal obligations	2,016	1,957
Other regulatory liabilities, deferred	692	715
Other deferred credits and liabilities	1,350	1,031
Total deferred credits and other liabilities	33,745	33,429
Total Liabilities	108,506	104,106
Common Stockholders' Equity:
Common stock	5,446	5,423
Paid-in capital	14,149	13,775
Treasury, at cost	(59)	(59)
Retained earnings	13,750	12,482
Accumulated other comprehensive loss	(78)	(177)
Total common stockholders' equity	33,208	31,444
Noncontrolling Interests	3,466	3,781
Total stockholders' equity	36,674	35,225
Total Liabilities and Stockholders' Equity	145,180	139,331
Commitments and Contingent Matters

Consolidated Balance Sheets -_2

Consolidated Balance Sheets - Southern (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Other intangible assets, amortization	$ 412	$ 376
Common Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 5	$ 5
Common stock, shares authorized (in shares)	1,500	1,500
Common stock, shares issued (in shares)	1,100	1,100
Treasury stock (in shares)	1	1

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - Southern - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)			(1)
Beginning balance (in shares) at Dec. 31, 2021		1,061
Beginning balance at Dec. 31, 2021	$ 32,276	$ 5,279	$ (47)	$ 11,950	$ 10,929	$ (237)	$ 4,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	3,417				3,524		(107)
Other comprehensive income (loss)	71					71
Stock issued (in shares)		29
Stock issued	1,808	$ 138		1,670
Stock-based compensation	44			44
Cash dividends on common stock	(2,907)				(2,907)
Capital contributions from noncontrolling interests	88						88
Distributions to noncontrolling interests	(259)						(259)
Other	(6)		(6)	9	(8)	(1)
Ending balance (in shares) at Dec. 31, 2022		1,090
Ending balance at Dec. 31, 2022	34,532	$ 5,417	$ (53)	13,673	11,538	(167)	4,124
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)			(1)
Consolidated net income (loss)	3,849				3,976		(127)
Other comprehensive income (loss)	(10)					(10)
Stock issued (in shares)		2
Stock issued	36	$ 6		30
Stock-based compensation	73			73
Cash dividends on common stock	(3,035)				(3,035)
Capital contributions from noncontrolling interests	21						21
Distributions to noncontrolling interests	(236)						(236)
Other	(5)		$ (6)	(1)	3		(1)
Ending balance (in shares) at Dec. 31, 2023		1,092
Ending balance at Dec. 31, 2023	$ 35,225	$ 5,423	$ (59)	13,775	12,482	(177)	3,781
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	(1)		(1)
Consolidated net income (loss)	$ 4,260				4,401		(141)
Other comprehensive income (loss)	99					99
Stock issued (in shares)		6
Stock issued	322	$ 23		299
Stock-based compensation	56			56
Cash dividends on common stock	(3,133)				(3,133)
Capital contributions from noncontrolling interests	11						11
Distributions to noncontrolling interests	(185)						(185)
Other (in shares)		0	0
Other	19	$ 0	$ 0	19	0	0	0
Ending balance (in shares) at Dec. 31, 2024		1,098
Ending balance at Dec. 31, 2024	$ 36,674	$ 5,446	$ (59)	$ 14,149	$ 13,750	$ (78)	$ 3,466
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	(1)		(1)

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity - Southern (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 2.8600	$ 2.7800	$ 2.7000

Statements of Income - APC

Statements of Income - APC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Revenues:
Total operating revenues	$ 26,724	$ 25,253	$ 29,279
Operating Expenses:
Other operations and maintenance	6,539	6,093	6,824
Depreciation and amortization	4,755	4,525	3,663
Taxes other than income taxes	1,540	1,425	1,411
Total operating expenses	19,656	19,427	23,909
Operating Income	7,068	5,826	5,370
Other Income and (Expense):
Allowance for equity funds used during construction	235	268	224
Interest expense, net of amounts capitalized	(2,743)	(2,446)	(2,022)
Other income (expense), net	530	553	500
Total other income and (expense)	(1,839)	(1,481)	(1,147)
Earnings Before Income Taxes	5,229	4,345	4,223
Income taxes	969	496	795
Net Income	4,260	3,849	3,428
Dividends on Preferred Stock	0	0	11
Consolidated Net Income	4,401	3,976	3,524
Retail revenues
Operating Revenues:
Total operating revenues	17,790	16,343	18,197
Other revenues
Operating Revenues:
Total operating revenues	1,151	949	732
Operating Expenses:
Cost of sales	668	560	396
Fuel
Operating Expenses:
Cost of sales	4,096	4,365	6,835
Purchased power, non-affiliates
Operating Expenses:
Cost of sales	883	883	1,593
Alabama Power
Operating Revenues:
Total operating revenues	7,554	7,050	7,817
Operating Expenses:
Other operations and maintenance	1,895	1,769	1,935
Depreciation and amortization	1,459	1,401	875
Taxes other than income taxes	471	442	424
Total operating expenses	5,557	5,415	5,875
Operating Income	1,997	1,635	1,942
Other Income and (Expense):
Allowance for equity funds used during construction	57	82	70
Interest expense, net of amounts capitalized	(448)	(425)	(382)
Other income (expense), net	157	159	144
Total other income and (expense)	(234)	(184)	(168)
Earnings Before Income Taxes	1,763	1,451	1,774
Income taxes	360	81	423
Net Income	1,403	1,370	1,351
Dividends on Preferred Stock	0	0	11
Consolidated Net Income	1,403	1,370	1,340
Alabama Power | Retail revenues
Operating Revenues:
Total operating revenues	6,639	6,159	6,470
Alabama Power | Wholesale revenues
Operating Revenues:
Total operating revenues	337	424	726
Alabama Power | Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	139	60	202
Alabama Power | Other revenues
Operating Revenues:
Total operating revenues	439	407	419
Alabama Power | Fuel
Operating Expenses:
Cost of sales	1,358	1,299	1,840
Alabama Power | Purchased power, non-affiliates
Operating Expenses:
Cost of sales	199	253	441
Alabama Power | Purchased power, affiliates
Operating Expenses:
Cost of sales	$ 175	$ 251	$ 360

Statements of Comprehensive Inc

Statements of Comprehensive Income - APC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Income	$ 4,260	$ 3,849	$ 3,428
Qualifying hedges:
Changes in fair value, net of tax	(5)	(41)	(60)
Reclassification adjustment for amounts included in net income, net of tax	80	69	73
Total other comprehensive income (loss)	99	(10)	71
Comprehensive Income	4,500	3,966	3,595
Alabama Power
Net Income	1,403	1,370	1,351
Qualifying hedges:
Changes in fair value, net of tax	0	0	(1)
Reclassification adjustment for amounts included in net income, net of tax	2	2	5
Total other comprehensive income (loss)	2	2	4
Comprehensive Income	$ 1,405	$ 1,372	$ 1,355

Statements of Comprehensive I_2

Statements of Comprehensive Income - APC (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Qualifying hedges, change in fair value, tax	$ (2)	$ (17)	$ (19)
Qualifying hedges, reclassification adjustment, tax	28	27	23
Alabama Power
Qualifying hedges, change in fair value, tax	0	0	0
Qualifying hedges, reclassification adjustment, tax	$ 1	$ 1	$ 2

Statements of Cash Flows - APC

Statements of Cash Flows - APC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net Income	$ 4,260	$ 3,849	$ 3,428
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	5,266	4,986	4,064
Deferred income taxes	536	63	670
Allowance for equity funds used during construction	(235)	(268)	(224)
Pension, postretirement, and other employee benefits	(556)	(527)	(436)
Settlement of asset retirement obligations	(566)	(617)	(455)
Natural disaster reserve and reliability reserve accruals	163	124	430
Retail fuel cost under recovery – long-term	(32)	(206)	(2,166)
Other, net	(39)	(138)	226
Changes in certain current assets and liabilities —
-Receivables	(372)	482	(771)
-Fossil fuel stock	140	(368)	(125)
-Materials and supplies	(189)	(345)	(160)
-Retail fuel cost under recovery	984	686	(100)
-Other current assets	(47)	(106)	(186)
-Accounts payable	492	(863)	1,021
-Other current liabilities	145	191	153
Net cash provided from operating activities	9,788	7,553	6,302
Investing Activities:
Property additions	(8,955)	(9,095)	(7,923)
Nuclear decommissioning trust fund purchases	(1,551)	(1,142)	(1,125)
Nuclear decommissioning trust fund sales	1,535	1,121	1,112
Cost of removal, net of salvage	(632)	(592)	(649)
Other investing activities	(164)	(43)	(133)
Net cash used for investing activities	(9,400)	(9,668)	(8,430)
Financing Activities:
Increase (decrease) in notes payable, net	(648)		(337)
Increase (decrease) in notes payable, net		973
Proceeds —
Short-term borrowings	700	350	2,650
Redemptions and repurchases —
Preferred stock	0	0	(298)
Short-term borrowings	(1,020)	(1,630)	(1,150)
Payment of common stock dividends	(2,954)	(3,035)	(2,907)
Other financing activities	(181)	(139)	(145)
Net cash provided from (used for) financing activities	(208)	999	2,336
Net Change in Cash, Cash Equivalents, and Restricted Cash	180	(1,116)	208
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	921	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Year	1,101	921	2,037
Cash paid during the period for —
Interest, net of amounts capitalized	2,538	2,184	1,758
Income taxes, net	176	132	146
Noncash transactions — Accrued property additions at year-end	1,199	1,027	1,024
Alabama Power
Operating Activities:
Net Income	1,403	1,370	1,351
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	1,608	1,554	1,014
Deferred income taxes	(55)	(242)	355
Allowance for equity funds used during construction	(57)	(82)	(70)
Pension, postretirement, and other employee benefits	(213)	(204)	(118)
Settlement of asset retirement obligations	(254)	(270)	(205)
Natural disaster reserve and reliability reserve accruals	96	70	185
Retail fuel cost under recovery – long-term	0	0	(520)
Other, net	102	4	(50)
Changes in certain current assets and liabilities —
-Receivables	(32)	(24)	(321)
-Fossil fuel stock	55	(165)	(70)
-Materials and supplies	(57)	(105)	(7)
-Retail fuel cost under recovery	246	376	(102)
-Other current assets	(32)	(20)	(23)
-Accounts payable	(127)	(162)	249
-Other current liabilities	212	(21)	(29)
Net cash provided from operating activities	2,895	2,079	1,639
Investing Activities:
Property additions	(1,881)	(2,022)	(2,016)
Nuclear decommissioning trust fund purchases	(593)	(301)	(355)
Nuclear decommissioning trust fund sales	592	300	354
Cost of removal, net of salvage	(166)	(178)	(234)
Change in construction payables, net of joint owner portion	10	(44)	50
Other investing activities	51	49	(62)
Net cash used for investing activities	(1,987)	(2,196)	(2,263)
Financing Activities:
Increase (decrease) in notes payable, net	(40)
Increase (decrease) in notes payable, net		40	0
Proceeds —
Senior notes	0	500	1,700
Revenue bonds	0	326	0
Short-term borrowings	50	0	0
Other long-term debt	8	29	0
Redemptions and repurchases —
Senior notes	0	(300)	(750)
Preferred stock	0	0	(298)
Revenue bonds	(21)	0	0
Short-term borrowings	(50)	0	0
Other long-term debt	(22)	0	0
Capital contributions from parent company	527	407	649
Payment of common stock dividends	(1,182)	(1,141)	(1,016)
Other financing activities	(2)	(22)	(34)
Net cash provided from (used for) financing activities	(732)	(161)	251
Net Change in Cash, Cash Equivalents, and Restricted Cash	176	(278)	(373)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	409	687	1,060
Cash, Cash Equivalents, and Restricted Cash at End of Year	585	409	687
Cash paid during the period for —
Interest, net of amounts capitalized	428	397	342
Income taxes, net	387	315	121
Noncash transactions — Accrued property additions at year-end	$ 148	$ 138	$ 182

Statements of Cash Flows - APC

Statements of Cash Flows - APC (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net cash paid for capitalized interest	$ 103	$ 132	$ 103
Alabama Power
Net cash paid for capitalized interest	$ 18	$ 27	$ 20

Balance Sheets - APC

Balance Sheets - APC - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 1,070	$ 748
Receivables —
Customer accounts and affiliated	2,228	2,030
Unbilled revenues	825	786
Other accounts and notes	597	519
Accumulated provision for uncollectible accounts	(74)	(68)
Fossil fuel stock	803	943
Materials and supplies	2,178	1,989
Prepaid expenses	294	406
Other regulatory assets	804	1,120
Other current assets	476	533
Total current assets	10,694	10,432
Property, Plant, and Equipment:
In service	137,143	128,428
Less: Accumulated depreciation	40,126	37,725
Plant in service, net of depreciation	97,017	90,703
Other utility plant, net	410	499
Nuclear fuel, at amortized cost	873	858
Construction work in progress	6,389	7,784
Total property, plant, and equipment	104,689	99,844
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	2,621	2,424
Equity investments in unconsolidated subsidiaries	1,416	1,368
Miscellaneous property and investments	668	665
Other Property and Investments	10,198	9,986
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,386	1,432
Deferred charges related to income taxes	889	886
Regulatory assets – asset retirement obligations	5,458	5,459
Other regulatory assets, deferred	7,037	6,264
Other deferred charges and assets	1,467	1,468
Total deferred charges and other assets	19,599	19,069
Total Assets	145,180	139,331
Current Liabilities:
Securities due within one year	4,718	2,476
Notes payable	1,338	2,314
Accounts payable —
Customer deposits	486	503
Accrued interest	682	652
Accrued compensation	1,261	1,151
Asset retirement obligations	731	744
Other regulatory liabilities	369	141
Other current liabilities	1,100	1,029
Total current liabilities	15,993	13,467
Long-Term Debt	58,768	57,210
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	11,730	10,990
Deferred credits related to income taxes	4,434	4,674
Accumulated deferred ITCs	2,056	2,067
Employee benefit obligations	1,011	1,115
Operating lease obligations	1,253	1,307
Asset retirement obligations, deferred	9,203	9,573
Other regulatory liabilities, deferred	692	715
Other deferred credits and liabilities	1,350	1,031
Total deferred credits and other liabilities	33,745	33,429
Total Liabilities	108,506	104,106
Common Stockholders' Equity:
Common stock	5,446	5,423
Paid-in capital	14,149	13,775
Retained earnings	13,750	12,482
Accumulated other comprehensive loss	(78)	(177)
Total common stockholders' equity	33,208	31,444
Total Liabilities and Stockholders' Equity	145,180	139,331
Commitments and Contingent Matters
Alabama Power
Current Assets:
Cash and cash equivalents	585	324
Receivables —
Customer accounts and affiliated	512	513
Unbilled revenues	187	191
Other accounts and notes	126	109
Accumulated provision for uncollectible accounts	(22)	(16)
Fossil fuel stock	339	394
Materials and supplies	699	655
Prepaid expenses	63	62
Regulatory assets – under recovered retail fuel clause revenues	0	246
Other regulatory assets	332	385
Other current assets	79	142
Total current assets	2,991	3,077
Property, Plant, and Equipment:
In service	36,501	35,429
Less: Accumulated depreciation	11,741	11,131
Plant in service, net of depreciation	24,760	24,298
Other utility plant, net	410	499
Nuclear fuel, at amortized cost	262	253
Construction work in progress	1,377	1,095
Total property, plant, and equipment	26,809	26,145
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,386	1,261
Equity investments in unconsolidated subsidiaries	48	52
Miscellaneous property and investments	129	155
Other Property and Investments	1,563	1,468
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	84	87
Deferred charges related to income taxes	264	262
Prepaid pension and other postretirement benefit costs	841	659
Regulatory assets – asset retirement obligations	1,780	1,810
Other regulatory assets, deferred	1,815	1,858
Other deferred charges and assets	391	414
Total deferred charges and other assets	5,175	5,090
Total Assets	36,538	35,780
Current Liabilities:
Securities due within one year	655	223
Notes payable	0	40
Accounts payable —
Affiliated and other	625	630
Customer deposits	113	105
Accrued taxes	78	51
Accrued interest	120	122
Accrued compensation	240	222
Asset retirement obligations	364	346
Other regulatory liabilities	165	44
Other current liabilities	219	191
Total current liabilities	2,878	2,304
Long-Term Debt	10,499	10,960
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	4,178	4,170
Deferred credits related to income taxes	1,398	1,506
Accumulated deferred ITCs	113	74
Employee benefit obligations	148	155
Operating lease obligations	76	81
Asset retirement obligations, deferred	3,694	3,812
Other regulatory liabilities, deferred	271	291
Other deferred credits and liabilities	195	94
Total deferred credits and other liabilities	10,073	10,183
Total Liabilities	23,450	23,447
Common Stockholders' Equity:
Common stock	1,222	1,222
Paid-in capital	7,657	7,125
Retained earnings	4,214	3,993
Accumulated other comprehensive loss	(5)	(7)
Total common stockholders' equity	13,088	12,333
Total Liabilities and Stockholders' Equity	36,538	35,780
Commitments and Contingent Matters
Alabama Power | Related Party
Receivables —
Customer accounts and affiliated	91	72
Accounts payable —
Affiliated and other	$ 299	$ 330

Balance Sheets - APC (Parenthet

Balance Sheets - APC (Parenthetical) - $ / shares shares in Millions	Dec. 31, 2024	Dec. 31, 2023
Common Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 5	$ 5
Common stock, shares authorized (in shares)	1,500	1,500
Alabama Power
Common Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 40	$ 40
Common stock, shares authorized (in shares)	40	40
Common stock, shares outstanding (in shares)	31	31

Statements of Common Stockholde

Statements of Common Stockholders' Equity - APC - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Alabama Power	Alabama Power Common Stock	Alabama Power Paid-In Capital	Alabama Power Retained Earnings	Alabama Power Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2021		1,061					31
Beginning balance at Dec. 31, 2021						$ 10,713	$ 1,222	$ 6,056	$ 3,448	$ (13)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock	$ 3,524					1,340			1,340
Capital contributions from parent company						654		654
Other comprehensive income (loss)	71				$ 71	4				4
Cash dividends on common stock	(2,907)			$ (2,907)		(1,016)			(1,016)
Other	(6)		$ 9	(8)	(1)	(8)			(8)
Ending balance (in shares) at Dec. 31, 2022		1,090					31
Ending balance at Dec. 31, 2022						11,687	$ 1,222	6,710	3,764	(9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock	3,976					1,370			1,370
Capital contributions from parent company						415		415
Other comprehensive income (loss)	(10)				(10)	2				2
Cash dividends on common stock	(3,035)			(3,035)		(1,141)			(1,141)
Other	(5)		(1)	3
Ending balance (in shares) at Dec. 31, 2023		1,092					31
Ending balance at Dec. 31, 2023	31,444					12,333	$ 1,222	7,125	3,993	(7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock	4,401					1,403			1,403
Capital contributions from parent company						532		532
Other comprehensive income (loss)	99				99	2				2
Cash dividends on common stock	(3,133)			(3,133)		(1,182)			(1,182)
Other (in shares)		0
Other	19	$ 0	$ 19	$ 0	$ 0
Ending balance (in shares) at Dec. 31, 2024		1,098					31
Ending balance at Dec. 31, 2024	$ 33,208					$ 13,088	$ 1,222	$ 7,657	$ 4,214	$ (5)

Statements of Income - GPC

Statements of Income - GPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Revenues:
Total operating revenues	$ 26,724	$ 25,253	$ 29,279
Operating Expenses:
Other operations and maintenance	6,539	6,093	6,824
Depreciation and amortization	4,755	4,525	3,663
Taxes other than income taxes	1,540	1,425	1,411
Estimated loss on Plant Vogtle Units 3 and 4	(21)	(68)	183
Total operating expenses	19,656	19,427	23,909
Operating Income	7,068	5,826	5,370
Other Income and (Expense):
Allowance for equity funds used during construction	235	268	224
Interest expense, net of amounts capitalized	(2,743)	(2,446)	(2,022)
Other income (expense), net	530	553	500
Total other income and (expense)	(1,839)	(1,481)	(1,147)
Earnings Before Income Taxes	5,229	4,345	4,223
Income taxes (benefit)	969	496	795
Net Income	4,260	3,849	3,428
Retail revenues
Operating Revenues:
Total operating revenues	17,790	16,343	18,197
Other revenues
Operating Revenues:
Total operating revenues	1,151	949	732
Operating Expenses:
Cost of sales	668	560	396
Fuel
Operating Expenses:
Cost of sales	4,096	4,365	6,835
Purchased power, non-affiliates
Operating Expenses:
Cost of sales	883	883	1,593
Georgia Power
Operating Revenues:
Total operating revenues	11,331	10,118	11,584
Operating Expenses:
Other operations and maintenance	2,372	2,083	2,349
Depreciation and amortization	1,774	1,681	1,430
Taxes other than income taxes	647	541	527
Estimated loss on Plant Vogtle Units 3 and 4	(21)	(68)	183
Total operating expenses	7,790	7,299	9,232
Operating Income	3,541	2,819	2,352
Other Income and (Expense):
Allowance for equity funds used during construction	152	165	140
Interest expense, net of amounts capitalized	(725)	(626)	(485)
Other income (expense), net	178	170	176
Total other income and (expense)	(395)	(291)	(169)
Earnings Before Income Taxes	3,146	2,528	2,183
Income taxes (benefit)	603	448	370
Net Income	2,543	2,080	1,813
Georgia Power | Retail revenues
Operating Revenues:
Total operating revenues	10,187	9,222	10,792
Georgia Power | Wholesale revenues
Operating Revenues:
Total operating revenues	265	188	235
Georgia Power | Other revenues
Operating Revenues:
Total operating revenues	879	708	557
Georgia Power | Fuel
Operating Expenses:
Cost of sales	1,658	1,781	2,486
Georgia Power | Purchased power, non-affiliates
Operating Expenses:
Cost of sales	615	517	856
Georgia Power | Purchased power, affiliates
Operating Expenses:
Cost of sales	$ 745	$ 764	$ 1,401

Statements of Comprehensive I_3

Statements of Comprehensive Income - GPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Income	$ 4,260	$ 3,849	$ 3,428
Qualifying hedges:
Changes in fair value, net of tax	(5)	(41)	(60)
Reclassification adjustment for amounts included in net income, net of tax	80	69	73
Total other comprehensive income (loss)	99	(10)	71
Comprehensive Income	4,500	3,966	3,595
Georgia Power
Net Income	2,543	2,080	1,813
Qualifying hedges:
Changes in fair value, net of tax	18	(2)	23
Reclassification adjustment for amounts included in net income, net of tax	4	5	5
Total other comprehensive income (loss)	22	3	28
Comprehensive Income	$ 2,565	$ 2,083	$ 1,841

Statements of Comprehensive I_4

Statements of Comprehensive Income - GPC (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Qualifying hedges, change in fair value, tax	$ (2)	$ (17)	$ (19)
Qualifying hedges, reclassification adjustment, tax	28	27	23
Georgia Power
Qualifying hedges, change in fair value, tax	6	(1)	8
Qualifying hedges, reclassification adjustment, tax	$ 1	$ 2	$ 2

Statements of Cash Flows - GPC

Statements of Cash Flows - GPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net Income	$ 4,260	$ 3,849	$ 3,428
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	5,266	4,986	4,064
Deferred income taxes	536	63	670
Allowance for equity funds used during construction	(235)	(268)	(224)
Pension, postretirement, and other employee benefits	(556)	(527)	(436)
Settlement of asset retirement obligations	(566)	(617)	(455)
Estimated loss on Plant Vogtle Units 3 and 4	(21)	(68)	183
Storm damage cost recovery – long-term	(631)	0	0
Other, net	(39)	(138)	226
Changes in certain current assets and liabilities —
-Receivables	(372)	482	(771)
-Retail fuel cost under recovery	984	686	(100)
-Fossil fuel stock	140	(368)	(125)
-Materials and supplies	(189)	(345)	(160)
-Other current assets	(47)	(106)	(186)
-Accounts payable	492	(863)	1,021
-Accrued taxes	206	23	51
-Customer refunds	83	(157)	119
-Other current liabilities	145	191	153
Net cash provided from operating activities	9,788	7,553	6,302
Investing Activities:
Property additions	(8,955)	(9,095)	(7,923)
Nuclear decommissioning trust fund purchases	(1,551)	(1,142)	(1,125)
Nuclear decommissioning trust fund sales	1,535	1,121	1,112
Cost of removal, net of salvage	(632)	(592)	(649)
Payments pursuant to LTSAs	(108)	(99)	(190)
Other investing activities	(164)	(43)	(133)
Net cash used for investing activities	(9,400)	(9,668)	(8,430)
Financing Activities:
Increase (decrease) in notes payable, net		973
Increase (decrease) in notes payable, net	(648)		(337)
Proceeds —
Short-term borrowings	700	350	2,650
Redemptions and repurchases —
Short-term borrowings	(1,020)	(1,630)	(1,150)
Payment of common stock dividends	(2,954)	(3,035)	(2,907)
Other financing activities	(181)	(139)	(145)
Net cash provided from (used for) financing activities	(208)	999	2,336
Net Change in Cash, Cash Equivalents, and Restricted Cash	180	(1,116)	208
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	921	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Year	1,101	921	2,037
Cash paid during the period for —
Interest, net of amounts capitalized	2,538	2,184	1,758
Income taxes, net (excludes credit transfers)	176	132	146
Noncash transactions — Accrued property additions at year-end	1,199	1,027	1,024
Georgia Power
Operating Activities:
Net Income	2,543	2,080	1,813
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	2,080	1,914	1,622
Deferred income taxes	369	184	313
Allowance for equity funds used during construction	(152)	(165)	(140)
Pension, postretirement, and other employee benefits	(288)	(272)	(240)
Settlement of asset retirement obligations	(270)	(304)	(212)
Storm damage accruals	31	31	213
Estimated loss on Plant Vogtle Units 3 and 4	(21)	(68)	183
Retail fuel cost under recovery – long-term	0	(157)	(1,646)
Storm damage cost recovery – long-term	(631)	0	0
Other, net	(144)	(82)	81
Changes in certain current assets and liabilities —
-Receivables	(268)	(57)	(286)
-Retail fuel cost under recovery	738	308	0
-Fossil fuel stock	96	(189)	(43)
-Materials and supplies	(81)	(154)	(73)
-Other current assets	(51)	(63)	(83)
-Accounts payable	633	(206)	264
-Accrued taxes	212	74	173
-Customer refunds	(4)	(117)	113
-Other current liabilities	1	(5)	(14)
Net cash provided from operating activities	4,793	2,752	2,038
Investing Activities:
Property additions	(4,816)	(4,786)	(3,809)
Nuclear decommissioning trust fund purchases	(958)	(841)	(770)
Nuclear decommissioning trust fund sales	942	821	758
Cost of removal, net of salvage	(336)	(279)	(274)
Change in construction payables, net of joint owner portion	68	50	186
Payments pursuant to LTSAs	(74)	(49)	(44)
Proceeds from dispositions	357	59	56
Other investing activities	(79)	(54)	(57)
Net cash used for investing activities	(4,896)	(5,079)	(3,954)
Financing Activities:
Increase (decrease) in notes payable, net		811
Increase (decrease) in notes payable, net	(811)		0
Proceeds —
Senior notes	2,117	2,450	1,500
Short-term borrowings	350	350	2,100
Revenue bonds	0	229	200
Redemptions and repurchases —
Senior notes	(400)	(800)	(400)
Short-term borrowings	(670)	(1,430)	(500)
FFB loan	(86)	(86)	(88)
Revenue bonds	0	0	(53)
Other long-term debt	0	0	(125)
Capital contributions from parent company	1,780	2,291	1,471
Payment of common stock dividends	(2,051)	(1,855)	(1,691)
Other financing activities	(83)	(38)	(51)
Net cash provided from (used for) financing activities	146	1,922	2,363
Net Change in Cash, Cash Equivalents, and Restricted Cash	43	(405)	447
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	75	480	33
Cash, Cash Equivalents, and Restricted Cash at End of Year	118	75	480
Cash paid during the period for —
Interest, net of amounts capitalized	680	592	432
Income taxes, net (excludes credit transfers)	(14)	220	30
Noncash transactions — Accrued property additions at year-end	$ 739	$ 680	$ 626

Statements of Cash Flows - GPC

Statements of Cash Flows - GPC (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net cash paid for capitalized interest	$ 103	$ 132	$ 103
Georgia Power
Net cash paid for capitalized interest	$ 57	$ 86	$ 73

Balance Sheets - GPC

Balance Sheets - GPC - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 1,070	$ 748
Receivables —
Customer accounts, net and affiliated	2,228	2,030
Unbilled revenues	825	786
Under recovered fuel clause revenues	713	696
Other accounts and notes	597	519
Fossil fuel stock	803	943
Materials and supplies	2,178	1,989
Regulatory assets – asset retirement obligations	353	274
Other regulatory assets	804	1,120
Other current assets	476	533
Total current assets	10,694	10,432
Property, Plant, and Equipment:
In service	137,143	128,428
Less: Accumulated depreciation	40,126	37,725
Plant in service, net of depreciation	97,017	90,703
Nuclear fuel, at amortized cost	873	858
Construction work in progress	6,389	7,784
Total property, plant, and equipment	104,689	99,844
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	2,621	2,424
Equity investments in unconsolidated subsidiaries	1,416	1,368
Miscellaneous property and investments	668	665
Other Property and Investments	10,198	9,986
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,386	1,432
Deferred charges related to income taxes	889	886
Prepaid pension costs	2,674	2,079
Deferred under recovered retail fuel clause revenues	485	1,261
Regulatory assets – asset retirement obligations, deferred	5,458	5,459
Other regulatory assets, deferred	7,037	6,264
Other deferred charges and assets	1,467	1,468
Total deferred charges and other assets	19,599	19,069
Total Assets	145,180	139,331
Current Liabilities:
Securities due within one year	4,718	2,476
Notes payable	1,338	2,314
Accounts payable —
Customer deposits	486	503
Accrued interest	682	652
Accrued compensation	1,261	1,151
Operating lease obligations	200	183
Asset retirement obligations	731	744
Other regulatory liabilities	369	141
Other current liabilities	1,100	1,029
Total current liabilities	15,993	13,467
Long-Term Debt	58,768	57,210
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	11,730	10,990
Deferred credits related to income taxes	4,434	4,674
Accumulated deferred ITCs	2,056	2,067
Employee benefit obligations	1,011	1,115
Operating lease obligations, deferred	1,253	1,307
Asset retirement obligations, deferred	9,203	9,573
Other deferred credits and liabilities	1,350	1,031
Total deferred credits and other liabilities	33,745	33,429
Total Liabilities	108,506	104,106
Common Stockholders' Equity:
Common stock	5,446	5,423
Paid-in capital	14,149	13,775
Retained earnings	13,750	12,482
Accumulated other comprehensive loss	(78)	(177)
Total common stockholders' equity	33,208	31,444
Total Liabilities and Stockholders' Equity	145,180	139,331
Commitments and Contingent Matters
Georgia Power
Current Assets:
Cash and cash equivalents	97	9
Receivables —
Customer accounts, net and affiliated	985	843
Unbilled revenues	341	275
Under recovered fuel clause revenues	713	694
Joint owner accounts	101	119
Other accounts and notes	92	81
Fossil fuel stock	385	480
Materials and supplies	968	883
Regulatory assets – asset retirement obligations	222	98
Other regulatory assets	373	423
Other current assets	262	305
Total current assets	4,604	4,261
Property, Plant, and Equipment:
In service	55,036	49,370
Less: Accumulated depreciation	14,806	13,955
Plant in service, net of depreciation	40,230	35,415
Nuclear fuel, at amortized cost	611	605
Construction work in progress	3,197	4,975
Total property, plant, and equipment	44,038	40,995
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,236	1,163
Equity investments in unconsolidated subsidiaries	43	47
Miscellaneous property and investments	192	151
Other Property and Investments	1,471	1,361
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,331	884
Deferred charges related to income taxes	596	594
Prepaid pension costs	897	706
Deferred under recovered retail fuel clause revenues	453	1,211
Regulatory assets – asset retirement obligations, deferred	3,436	3,407
Other regulatory assets, deferred	3,814	2,890
Other deferred charges and assets	615	508
Total deferred charges and other assets	11,142	10,200
Total Assets	61,255	56,817
Current Liabilities:
Securities due within one year	966	502
Notes payable	200	1,329
Accounts payable —
Affiliated and other	1,837	1,147
Customer deposits	256	250
Accrued taxes	803	582
Accrued interest	190	175
Accrued compensation	276	250
Operating lease obligations	169	135
Asset retirement obligations	309	338
Other regulatory liabilities	150	22
Other current liabilities	296	365
Total current liabilities	6,436	5,935
Long-Term Debt	17,384	16,198
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	4,385	4,018
Deferred credits related to income taxes	2,047	2,161
Accumulated deferred ITCs	343	326
Employee benefit obligations	205	248
Operating lease obligations, deferred	1,159	740
Asset retirement obligations, deferred	5,106	5,327
Other deferred credits and liabilities	509	481
Total deferred credits and other liabilities	13,754	13,301
Total Liabilities	37,574	35,434
Common Stockholders' Equity:
Common stock	398	398
Paid-in capital	19,708	17,923
Retained earnings	3,562	3,071
Accumulated other comprehensive loss	13	(9)
Total common stockholders' equity	23,681	21,383
Total Liabilities and Stockholders' Equity	61,255	56,817
Commitments and Contingent Matters
Georgia Power | Related Party
Receivables —
Customer accounts, net and affiliated	65	51
Accounts payable —
Affiliated and other	$ 984	$ 840

Balance Sheets - GPC (Parenthet

Balance Sheets - GPC (Parenthetical) - shares	Dec. 31, 2024	Dec. 31, 2023
Common Stockholders' Equity:
Common stock, shares authorized (in shares)	1,500,000,000	1,500,000,000
Georgia Power
Common Stockholders' Equity:
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares outstanding (in shares)	9,000,000	9,000,000

Statements of Common Stockhol_2

Statements of Common Stockholders' Equity - GPC - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Georgia Power	Georgia Power Common Stock	Georgia Power Paid-In Capital	Georgia Power Retained Earnings	Georgia Power Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2021		1,061					9
Beginning balance at Dec. 31, 2021						$ 17,234	$ 398	$ 14,153	$ 2,724	$ (41)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	$ 3,428					1,813			1,813
Capital contributions from parent company						1,473		1,473
Other comprehensive income	71				$ 71	28				28
Cash dividends on common stock	(2,907)			$ (2,907)		(1,691)			(1,691)
Other	(6)		$ 9	(8)	(1)	1				1
Ending balance (in shares) at Dec. 31, 2022		1,090					9
Ending balance at Dec. 31, 2022						18,858	$ 398	15,626	2,846	(12)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	3,849					2,080			2,080
Capital contributions from parent company						2,297		2,297
Other comprehensive income	(10)				(10)	3				3
Cash dividends on common stock	(3,035)			(3,035)		(1,855)			(1,855)
Other	(5)		(1)	3
Ending balance (in shares) at Dec. 31, 2023		1,092					9
Ending balance at Dec. 31, 2023	31,444					21,383	$ 398	17,923	3,071	(9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	4,260					2,543			2,543
Capital contributions from parent company						1,785		1,785
Other comprehensive income	99				99	22				22
Cash dividends on common stock	(3,133)			(3,133)		(2,051)			(2,051)
Other (in shares)		0					0
Other	19	$ 0	$ 19	$ 0	$ 0	(1)	$ 0	0	(1)	0
Ending balance (in shares) at Dec. 31, 2024		1,098					9
Ending balance at Dec. 31, 2024	$ 33,208					$ 23,681	$ 398	$ 19,708	$ 3,562	$ 13

Statements of Income - MPC

Statements of Income - MPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Revenues:
Total operating revenues	$ 26,724	$ 25,253	$ 29,279
Operating Expenses:
Other operations and maintenance	6,539	6,093	6,824
Depreciation and amortization	4,755	4,525	3,663
Taxes other than income taxes	1,540	1,425	1,411
Total operating expenses	19,656	19,427	23,909
Operating Income	7,068	5,826	5,370
Other Income and (Expense):
Interest expense, net of amounts capitalized	(2,743)	(2,446)	(2,022)
Other income (expense), net	530	553	500
Total other income and (expense)	(1,839)	(1,481)	(1,147)
Earnings Before Income Taxes	5,229	4,345	4,223
Income taxes	969	496	795
Net Income	4,260	3,849	3,428
Retail revenues
Operating Revenues:
Total operating revenues	17,790	16,343	18,197
Other revenues
Operating Revenues:
Total operating revenues	1,151	949	732
Operating Expenses:
Fuel and purchased power	668	560	396
Mississippi Power
Operating Revenues:
Total operating revenues	1,463	1,474	1,694
Operating Expenses:
Other operations and maintenance	370	362	376
Depreciation and amortization	193	190	181
Taxes other than income taxes	127	124	124
Total operating expenses	1,167	1,214	1,470
Operating Income	296	260	224
Other Income and (Expense):
Interest expense, net of amounts capitalized	(77)	(71)	(56)
Other income (expense), net	27	35	33
Total other income and (expense)	(50)	(36)	(23)
Earnings Before Income Taxes	246	224	201
Income taxes	47	36	37
Net Income	199	188	164
Mississippi Power | Retail revenues
Operating Revenues:
Total operating revenues	965	963	935
Mississippi Power | Wholesale revenues, non-affiliates
Operating Revenues:
Total operating revenues	228	272	252
Mississippi Power | Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	218	200	460
Mississippi Power | Other revenues
Operating Revenues:
Total operating revenues	52	39	47
Mississippi Power | Fuel and purchased power
Operating Expenses:
Fuel and purchased power	$ 477	$ 538	$ 789

Statements of Comprehensive I_5

Statements of Comprehensive Income - MPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Income	$ 4,260	$ 3,849	$ 3,428
Qualifying hedges:
Changes in fair value, net of tax	(5)	(41)	(60)
Total other comprehensive income (loss)	99	(10)	71
Comprehensive Income	4,500	3,966	3,595
Mississippi Power
Net Income	199	188	164
Qualifying hedges:
Changes in fair value, net of tax	5	0	0
Total other comprehensive income (loss)	5	0	0
Comprehensive Income	$ 204	$ 188	$ 164

Statements of Comprehensive I_6

Statements of Comprehensive Income - MPC (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Qualifying hedges, change in fair value, tax	$ (2)	$ (17)	$ (19)
Mississippi Power
Qualifying hedges, change in fair value, tax	$ 2	$ 0	$ 0

Statements of Cash Flows - MPC

Statements of Cash Flows - MPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net Income	$ 4,260	$ 3,849	$ 3,428
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	5,266	4,986	4,064
Deferred income taxes	536	63	670
Pension, postretirement, and other employee benefits	(556)	(527)	(436)
Settlement of asset retirement obligations	(566)	(617)	(455)
Retail fuel cost under recovery – long-term	(32)	(206)	(2,166)
Other, net	(39)	(138)	226
Changes in certain current assets and liabilities —
-Receivables	(372)	482	(771)
-Materials and supplies	(189)	(345)	(160)
-Other current assets	(47)	(106)	(186)
-Accounts payable	492	(863)	1,021
-Accrued taxes	206	23	51
-Other current liabilities	145	191	153
Net cash provided from operating activities	9,788	7,553	6,302
Investing Activities:
Property additions	(8,955)	(9,095)	(7,923)
Cost of removal net of salvage	(632)	(592)	(649)
Payments pursuant to LTSAs	(108)	(99)	(190)
Other investing activities	(164)	(43)	(133)
Net cash used for investing activities	(9,400)	(9,668)	(8,430)
Financing Activities:
Increase (decrease) in notes payable, net		973
Increase (decrease) in notes payable, net	(648)		(337)
Proceeds —
Payment of common stock dividends	(2,954)	(3,035)	(2,907)
Other financing activities	(181)	(139)	(145)
Net cash provided from (used for) financing activities	(208)	999	2,336
Net Change in Cash, Cash Equivalents, and Restricted Cash	180	(1,116)	208
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	921	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Year	1,101	921	2,037
Noncash transactions —
Interest	2,538	2,184	1,758
Income taxes, net	176	132	146
Noncash transactions — Accrued property additions at year-end	1,199	1,027	1,024
Mississippi Power
Operating Activities:
Net Income	199	188	164
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	209	232	223
Deferred income taxes	16	(13)	(6)
Pension, postretirement, and other employee benefits	(21)	(20)	(18)
Settlement of asset retirement obligations	(17)	(18)	(20)
System restoration rider and reliability reserve accruals	35	23	32
Retail fuel cost under recovery – long-term	(32)	(50)	0
Other, net	5	(5)	21
Changes in certain current assets and liabilities —
-Receivables	(14)	85	(82)
-Materials and supplies	(13)	(9)	(10)
-Other current assets	(21)	7	(15)
-Accounts payable	(10)	(81)	97
-Accrued taxes	(2)	(7)	5
-Retail fuel cost over recovery	55	27	0
-Other current liabilities	17	10	(8)
Net cash provided from operating activities	406	369	383
Investing Activities:
Property additions	(311)	(319)	(257)
Cost of removal net of salvage	(41)	(32)	(27)
Change in construction payables	0	9	(3)
Payments pursuant to LTSAs	(19)	(26)	(29)
Other investing activities	(2)	(2)	(1)
Net cash used for investing activities	(373)	(370)	(317)
Financing Activities:
Increase (decrease) in notes payable, net	14
Increase (decrease) in notes payable, net		0	0
Proceeds —
Senior notes	250	100	0
Revenue bonds	0	0	35
Redemptions — Senior notes	(200)	0	0
Capital contributions from parent company	68	68	68
Payment of common stock dividends	(188)	(185)	(170)
Other financing activities	(2)	(3)	(1)
Net cash provided from (used for) financing activities	(58)	(20)	(68)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(25)	(21)	(2)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	38	59	61
Cash, Cash Equivalents, and Restricted Cash at End of Year	13	38	59
Noncash transactions —
Interest	74	66	55
Income taxes, net	51	52	33
Noncash transactions — Accrued property additions at year-end	$ 36	$ 34	$ 22

Balance Sheets - MPC

Balance Sheets - MPC - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 1,070	$ 748
Receivables —
Customer accounts, net and affiliated	2,228	2,030
Unbilled revenues	825	786
Other accounts and notes	597	519
Fossil fuel stock	803	943
Materials and supplies	2,178	1,989
Other regulatory assets	804	1,120
Other current assets	476	533
Total current assets	10,694	10,432
Property, Plant, and Equipment:
In service	137,143	128,428
Less: Accumulated depreciation	40,126	37,725
Plant in service, net of depreciation	97,017	90,703
Construction work in progress	6,389	7,784
Total property, plant, and equipment	104,689	99,844
Other Property and Investments:
Other Property and Investments	10,198	9,986
Deferred Charges and Other Assets:
Deferred charges related to income taxes	889	886
Prepaid pension costs	2,674	2,079
Deferred under recovered retail fuel clause revenues	485	1,261
Regulatory assets – asset retirement obligations	5,458	5,459
Other regulatory assets, deferred	7,037	6,264
Other deferred charges and assets	1,467	1,468
Total deferred charges and other assets	19,599	19,069
Total Assets	145,180	139,331
Current Liabilities:
Securities due within one year	4,718	2,476
Notes payable	1,338	2,314
Accounts payable —
Accrued compensation	1,261	1,151
Asset retirement obligations	731	744
Other regulatory liabilities	369	141
Other current liabilities	1,100	1,029
Total current liabilities	15,993	13,467
Long-Term Debt	58,768	57,210
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	11,730	10,990
Deferred credits related to income taxes	4,434	4,674
Employee benefit obligations	1,011	1,115
Asset retirement obligations, deferred	9,203	9,573
Other cost of removal obligations	2,016	1,957
Other regulatory liabilities, deferred	692	715
Other deferred credits and liabilities	1,350	1,031
Total deferred credits and other liabilities	33,745	33,429
Total Liabilities	108,506	104,106
Common Stockholders' Equity:
Common stock	5,446	5,423
Paid-in capital	14,149	13,775
Accumulated deficit	13,750	12,482
Accumulated other comprehensive loss	(78)	(177)
Total common stockholders' equity	33,208	31,444
Total Liabilities and Stockholders' Equity	145,180	139,331
Commitments and Contingent Matters
Mississippi Power
Current Assets:
Cash and cash equivalents	13	38
Receivables —
Customer accounts, net and affiliated	45	36
Unbilled revenues	39	40
Other accounts and notes	24	20
Fossil fuel stock	56	47
Materials and supplies	103	89
Other regulatory assets	43	56
Other current assets	28	10
Total current assets	384	365
Property, Plant, and Equipment:
In service	5,697	5,523
Less: Accumulated depreciation	1,833	1,792
Plant in service, net of depreciation	3,864	3,731
Construction work in progress	253	203
Total property, plant, and equipment	4,117	3,934
Other Property and Investments:
Other Property and Investments	152	158
Deferred Charges and Other Assets:
Deferred charges related to income taxes	27	28
Prepaid pension costs	124	99
Deferred under recovered retail fuel clause revenues	32	50
Regulatory assets – asset retirement obligations	243	244
Other regulatory assets, deferred	259	285
Accumulated deferred income taxes	82	96
Other deferred charges and assets	74	85
Total deferred charges and other assets	841	887
Total Assets	5,494	5,344
Current Liabilities:
Securities due within one year	12	201
Notes payable	14	0
Accounts payable —
Affiliated and other	83	73
Accrued taxes	115	117
Accrued compensation	46	43
Asset retirement obligations	32	29
Over recovered retail fuel clause revenues	32	27
Other regulatory liabilities	5	17
Other current liabilities	95	90
Total current liabilities	502	679
Long-Term Debt	1,681	1,443
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	492	469
Deferred credits related to income taxes	219	229
Employee benefit obligations	65	67
Asset retirement obligations, deferred	116	139
Other cost of removal obligations	170	186
Other regulatory liabilities, deferred	121	92
Other deferred credits and liabilities	39	37
Total deferred credits and other liabilities	1,222	1,219
Total Liabilities	3,405	3,341
Common Stockholders' Equity:
Common stock	38	38
Paid-in capital	4,791	4,721
Accumulated deficit	(2,745)	(2,756)
Accumulated other comprehensive loss	5	0
Total common stockholders' equity	2,089	2,003
Total Liabilities and Stockholders' Equity	5,494	5,344
Commitments and Contingent Matters
Mississippi Power | Related Party
Receivables —
Customer accounts, net and affiliated	33	29
Accounts payable —
Affiliated and other	$ 68	$ 82

Balance Sheets - MPC (Parenthet

Balance Sheets - MPC (Parenthetical) - shares shares in Millions	Dec. 31, 2024	Dec. 31, 2023
Common Stockholders' Equity:
Common stock, shares authorized (in shares)	1,500	1,500
Mississippi Power
Common Stockholders' Equity:
Common stock, shares authorized (in shares)	50	50
Common stock, shares outstanding (in shares)	1	1

Statements of Common Stockhol_3

Statements of Common Stockholders' Equity - MPC - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Mississippi Power	Mississippi Power Common Stock	Mississippi Power Paid-In Capital	Mississippi Power Retained Earnings	Mississippi Power Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2021		1,061				1
Beginning balance at Dec. 31, 2021					$ 1,867	$ 38	$ 4,582	$ (2,753)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 3,524				164			164
Capital contributions from parent company					70		70
Other comprehensive income	71			$ 71
Cash dividends on common stock	(2,907)		$ (2,907)		(170)			(170)
Ending balance (in shares) at Dec. 31, 2022		1,090				1
Ending balance at Dec. 31, 2022					1,931	$ 38	4,652	(2,759)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,976				188			188
Capital contributions from parent company					69		69
Other comprehensive income	(10)			(10)
Cash dividends on common stock	(3,035)		(3,035)		(185)			(185)
Ending balance (in shares) at Dec. 31, 2023		1,092				1
Ending balance at Dec. 31, 2023	31,444				2,003	$ 38	4,721	(2,756)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,401				199			199
Capital contributions from parent company					70		70
Other comprehensive income	99			$ 99	5				5
Cash dividends on common stock	(3,133)		$ (3,133)		(188)			(188)
Ending balance (in shares) at Dec. 31, 2024		1,098				1
Ending balance at Dec. 31, 2024	$ 33,208				$ 2,089	$ 38	$ 4,791	$ (2,745)	$ 5

Consolidated Statements of In_2

Consolidated Statements of Income - SPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Revenues:
Total operating revenues	$ 26,724	$ 25,253	$ 29,279
Operating Expenses:
Other operations and maintenance	6,539	6,093	6,824
Depreciation and amortization	4,755	4,525	3,663
Taxes other than income taxes	1,540	1,425	1,411
Total operating expenses	19,656	19,427	23,909
Operating Income	7,068	5,826	5,370
Other Income and (Expense):
Interest expense, net of amounts capitalized	(2,743)	(2,446)	(2,022)
Other income (expense), net	530	553	500
Total other income and (expense)	(1,839)	(1,481)	(1,147)
Earnings Before Income Taxes	5,229	4,345	4,223
Income taxes (benefit)	969	496	795
Net Income	4,260	3,849	3,428
Net loss attributable to noncontrolling interests	(141)	(127)	(107)
Consolidated Net Income	4,401	3,976	3,524
Other revenues
Operating Revenues:
Total operating revenues	1,151	949	732
Operating Expenses:
Cost of sales	668	560	396
Fuel
Operating Expenses:
Cost of sales	4,096	4,365	6,835
Purchased power
Operating Expenses:
Cost of sales	883	883	1,593
Southern Power
Operating Revenues:
Total operating revenues	2,014	2,189	3,369
Operating Expenses:
Other operations and maintenance	516	473	483
Depreciation and amortization	522	504	516
Taxes other than income taxes	41	51	49
Gain on dispositions, net	0	(20)	(2)
Total operating expenses	1,736	1,830	2,971
Operating Income	278	359	398
Other Income and (Expense):
Interest expense, net of amounts capitalized	(117)	(129)	(138)
Other income (expense), net	13	12	7
Total other income and (expense)	(104)	(117)	(131)
Earnings Before Income Taxes	174	242	267
Income taxes (benefit)	(13)	12	20
Net Income	187	230	247
Net loss attributable to noncontrolling interests	(141)	(127)	(107)
Consolidated Net Income	328	357	354
Southern Power | Wholesale revenues, non-affiliates
Operating Revenues:
Total operating revenues	1,606	1,597	2,458
Southern Power | Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	371	537	875
Southern Power | Other revenues
Operating Revenues:
Total operating revenues	37	55	36
Southern Power | Fuel
Operating Expenses:
Cost of sales	579	706	1,614
Southern Power | Purchased power
Operating Expenses:
Cost of sales	$ 78	$ 116	$ 311

Consolidated Statements of Co_3

Consolidated Statements of Comprehensive Income - SPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Income	$ 4,260	$ 3,849	$ 3,428
Qualifying hedges:
Changes in fair value, net of tax	(5)	(41)	(60)
Reclassification adjustment for amounts included in net income, net of tax	80	69	73
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	23	(39)	48
Reclassification adjustment for amounts included in net income, net of tax	1	1	10
Total other comprehensive income (loss)	99	(10)	71
Comprehensive loss attributable to noncontrolling interests	(141)	(127)	(107)
Comprehensive Income	4,500	3,966	3,595
Southern Power
Net Income	187	230	247
Qualifying hedges:
Changes in fair value, net of tax	(31)	(3)	(91)
Reclassification adjustment for amounts included in net income, net of tax	39	11	81
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	7	(7)	18
Reclassification adjustment for amounts included in net income, net of tax	0	0	2
Total other comprehensive income (loss)	15	1	10
Comprehensive loss attributable to noncontrolling interests	(141)	(127)	(107)
Comprehensive Income	$ 343	$ 358	$ 364

Consolidated Statements of Co_4

Consolidated Statements of Comprehensive Income - SPC (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Qualifying hedges, change in fair value, tax	$ (2)	$ (17)	$ (19)
Qualifying hedges, reclassification adjustment, tax	28	27	23
Pension and other postretirement benefit plans, gain (loss), tax	10	(14)	18
Reclassification adjustment for amounts included in net income, tax	0	0	3
Southern Power
Qualifying hedges, change in fair value, tax	(10)	(1)	(30)
Qualifying hedges, reclassification adjustment, tax	12	4	26
Pension and other postretirement benefit plans, gain (loss), tax	2	(2)	6
Reclassification adjustment for amounts included in net income, tax	$ 0	$ 0	$ 1

Consolidated Statements of Ca_3

Consolidated Statements of Cash Flows - SPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net Income	$ 4,260	$ 3,849	$ 3,428
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	5,266	4,986	4,064
Deferred income taxes	536	63	670
Other, net	(39)	(138)	226
Changes in certain current assets and liabilities —
-Receivables	(372)	482	(771)
-Other current assets	(47)	(106)	(186)
-Accounts payable	492	(863)	1,021
-Other current liabilities	145	191	153
Net cash provided from operating activities	9,788	7,553	6,302
Investing Activities:
Property additions	(8,955)	(9,095)	(7,923)
Proceeds from dispositions	369	164	275
Payments pursuant to LTSAs	(108)	(99)	(190)
Other investing activities	(164)	(43)	(133)
Net cash used for investing activities	(9,400)	(9,668)	(8,430)
Financing Activities:
Increase (decrease) in notes payable, net	(648)		(337)
Increase (decrease) in notes payable, net		973
Distributions to noncontrolling interests	(185)	(234)	(259)
Payment of common stock dividends	(2,954)	(3,035)	(2,907)
Other financing activities	(181)	(139)	(145)
Net cash provided from (used for) financing activities	(208)	999	2,336
Net Change in Cash, Cash Equivalents, and Restricted Cash	180	(1,116)	208
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	921	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Year	1,101	921	2,037
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	2,538	2,184	1,758
Income taxes, net (excludes credit transfers)	176	132	146
Noncash transactions —
Accrued property additions at year-end	1,199	1,027	1,024
LTSA credits utilized from the sale of spare parts	13	23	0
Contributions from noncontrolling interests	0	0	15
Southern Power
Operating Activities:
Net Income	187	230	247
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	537	524	543
Deferred income taxes	(7)	16	9
Utilization of federal tax credit carryforward	75	332	49
Amortization of ITCs	(58)	(58)	(58)
Gain on dispositions, net	0	(20)	(2)
Other, net	36	28	19
Changes in certain current assets and liabilities —
-Receivables	(39)	121	(82)
-Prepaid income taxes	2	2	22
-Other current assets	(24)	(24)	(11)
-Accounts payable	(3)	(60)	68
-Other current liabilities	2	5	11
Net cash provided from operating activities	708	1,096	815
Investing Activities:
Acquisitions, net of cash acquired	0	(181)	0
Property additions	(344)	(118)	(100)
Change in construction payables	35	21	(69)
Proceeds from dispositions	0	59	48
Payments pursuant to LTSAs	(45)	(50)	(71)
Other investing activities	24	4	(2)
Net cash used for investing activities	(330)	(265)	(194)
Financing Activities:
Increase (decrease) in notes payable, net	(129)	(83)
Increase (decrease) in notes payable, net			10
Redemptions — Senior notes	0	(290)	(677)
Capital contributions from parent company	216	18	430
Capital contributions from noncontrolling interests	11	21	73
Distributions to noncontrolling interests	(185)	(234)	(259)
Payment of common stock dividends	(262)	(252)	(198)
Other financing activities	(5)	0	(2)
Net cash provided from (used for) financing activities	(354)	(820)	(623)
Net Change in Cash, Cash Equivalents, and Restricted Cash	24	11	(2)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	144	133	135
Cash, Cash Equivalents, and Restricted Cash at End of Year	168	144	133
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	107	122	142
Income taxes, net (excludes credit transfers)	(32)	(254)	(15)
Noncash transactions —
Accrued property additions at year-end	84	59	24
LTSA credits utilized from the sale of spare parts	13	23	0
Contributions from noncontrolling interests	$ 0	$ 0	$ 15

Consolidated Statements of Ca_4

Consolidated Statements of Cash Flows - SPC (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net cash paid for capitalized interest	$ 103	$ 132	$ 103
Southern Power
Net cash paid for capitalized interest	$ 7	$ 3	$ 0

Consolidated Balance Sheets -_3

Consolidated Balance Sheets - SPC - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 1,070	$ 748
Receivables —
Customer accounts, net and affiliated	2,228	2,030
Other	597	519
Materials and supplies	2,178	1,989
Other current assets	476	533
Total current assets	10,694	10,432
Property, Plant, and Equipment:
In service	137,143	128,428
Less: Accumulated provision for depreciation	40,126	37,725
Plant in service, net of depreciation	97,017	90,703
Construction work in progress	6,389	7,784
Total property, plant, and equipment	104,689	99,844
Other Property and Investments:
Other Property and Investments	10,198	9,986
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,386	1,432
Other deferred charges and assets	1,467	1,468
Total deferred charges and other assets	19,599	19,069
Total Assets	145,180	139,331
Current Liabilities:
Securities due within one year	4,718	2,476
Notes payable	1,338	2,314
Accounts payable —
Accrued interest	682	652
Operating lease obligations	200	183
Other current liabilities	1,100	1,029
Total current liabilities	15,993	13,467
Long-Term Debt	58,768	57,210
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	11,730	10,990
Accumulated deferred ITCs	2,056	2,067
Operating lease obligations, deferred	1,253	1,307
Other deferred credits and liabilities	1,350	1,031
Total deferred credits and other liabilities	33,745	33,429
Total Liabilities	108,506	104,106
Common Stockholders' Equity:
Common stock	5,446	5,423
Paid-in capital	14,149	13,775
Retained earnings	13,750	12,482
Accumulated other comprehensive loss	(78)	(177)
Total common stockholders' equity	33,208	31,444
Noncontrolling Interests	3,466	3,781
Total Stockholders' Equity (See accompanying statements)	36,674	35,225
Total Liabilities and Stockholders' Equity	145,180	139,331
Commitments and Contingent Matters
Southern Power
Current Assets:
Cash and cash equivalents	159	124
Receivables —
Customer accounts, net and affiliated	122	136
Other	90	54
Materials and supplies	107	80
Other current assets	82	92
Total current assets	599	523
Property, Plant, and Equipment:
In service	14,961	14,690
Less: Accumulated provision for depreciation	4,540	4,119
Plant in service, net of depreciation	10,421	10,571
Construction work in progress	317	278
Total property, plant, and equipment	10,738	10,849
Other Property and Investments:
Intangible assets, net of amortization of $168 and $148, respectively	223	243
Net investment in sales-type leases	143	148
Other Property and Investments	366	391
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	484	488
Prepaid LTSAs	234	248
Other deferred charges and assets	232	262
Total deferred charges and other assets	950	998
Total Assets	12,653	12,761
Current Liabilities:
Securities due within one year	500	0
Notes payable	0	138
Accounts payable —
Affiliated and other	100	91
Accrued taxes	18	26
Accrued interest	26	27
Operating lease obligations	29	29
Other current liabilities	96	97
Total current liabilities	849	490
Long-Term Debt	2,180	2,711
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	712	614
Accumulated deferred ITCs	1,440	1,498
Operating lease obligations, deferred	511	517
Other deferred credits and liabilities	279	233
Total deferred credits and other liabilities	2,942	2,862
Total Liabilities	5,971	6,063
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	1,306	1,088
Retained earnings	1,912	1,846
Accumulated other comprehensive loss	(2)	(17)
Total common stockholders' equity	3,216	2,917
Noncontrolling Interests	3,466	3,781
Total Stockholders' Equity (See accompanying statements)	6,682	6,698
Total Liabilities and Stockholders' Equity	12,653	12,761
Commitments and Contingent Matters
Southern Power | Related Party
Receivables —
Customer accounts, net and affiliated	39	37
Accounts payable —
Affiliated and other	$ 80	$ 82

Consolidated Balance Sheets -_4

Consolidated Balance Sheets - SPC (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Other intangible assets, amortization	$ 412	$ 376
Common Stockholders' Equity:
Common stock, shares authorized (in shares)	1,500,000,000	1,500,000,000
Southern Power
Other intangible assets, amortization	$ 168	$ 148
Cumulative preferred stock
Par value (in dollars per share)	$ 0.01	$ 0.01
Common Stockholders' Equity:
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares outstanding (in shares)	1,000	1,000

Consolidated Statements of St_3

Consolidated Statements of Stockholders' Equity - SPC - USD ($) $ in Millions	Total	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Southern Power	Southern Power Total Common Stockholder's Equity	Southern Power Paid-In Capital	Southern Power Retained Earnings	Southern Power Accumulated Other Comprehensive Income (Loss)	Southern Power Noncontrolling Interests
Beginning balance at Dec. 31, 2021	$ 32,276	$ 11,950	$ 10,929	$ (237)	$ 4,402	$ 6,598	$ 2,196	$ 638	$ 1,585	$ (27)	$ 4,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,428					247	354		354		(107)
Capital contributions from parent company						431	431	431
Other comprehensive income (loss)	71			71		10	10			10
Cash dividends on common stock	(2,907)		(2,907)			(198)	(198)		(198)
Capital contributions from noncontrolling interests	88				88	88					88
Distributions to noncontrolling interests	(259)				(259)	(259)					(259)
Other	(6)	9	(8)	(1)		(1)	(1)	0	0	(1)
Ending balance at Dec. 31, 2022	34,532	13,673	11,538	(167)	4,124	6,916	2,792	1,069	1,741	(18)	4,124
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,849					230	357		357		(127)
Capital contributions from parent company						19	19	19
Other comprehensive income (loss)	(10)			(10)		1	1			1
Cash dividends on common stock	(3,035)		(3,035)			(252)	(252)		(252)
Capital contributions from noncontrolling interests	21				21	21					21
Distributions to noncontrolling interests	(236)				(236)	(236)					(236)
Other	(5)	(1)	3		(1)	(1)					(1)
Ending balance at Dec. 31, 2023	35,225	13,775	12,482	(177)	3,781	6,698	2,917	1,088	1,846	(17)	3,781
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,260					187	328		328		(141)
Capital contributions from parent company						218	218	218
Other comprehensive income (loss)	99			99		15	15			15
Cash dividends on common stock	(3,133)		(3,133)			(262)	(262)		(262)
Capital contributions from noncontrolling interests	11				11	11					11
Distributions to noncontrolling interests	(185)				(185)	(185)					(185)
Other	19	19	0	0	0
Ending balance at Dec. 31, 2024	$ 36,674	$ 14,149	$ 13,750	$ (78)	$ 3,466	$ 6,682	$ 3,216	$ 1,306	$ 1,912	$ (2)	$ 3,466

Consolidated Statements of In_3

Consolidated Statements of Income - GAS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Revenues:
Total operating revenues	$ 26,724	$ 25,253	$ 29,279
Operating Expenses:
Other operations and maintenance	6,539	6,093	6,824
Depreciation and amortization	4,755	4,525	3,663
Taxes other than income taxes	1,540	1,425	1,411
Total operating expenses	19,656	19,427	23,909
Operating Income	7,068	5,826	5,370
Other Income and (Expense):
Earnings from equity method investments	139	144	151
Interest expense, net of amounts capitalized	(2,743)	(2,446)	(2,022)
Other income (expense), net	530	553	500
Total other income and (expense)	(1,839)	(1,481)	(1,147)
Earnings Before Income Taxes	5,229	4,345	4,223
Income taxes	969	496	795
Net Income	4,260	3,849	3,428
Southern Company Gas
Operating Revenues:
Total operating revenues	4,456	4,702	5,962
Operating Expenses:
Cost of natural gas	1,196	1,644	3,004
Other operations and maintenance	1,235	1,187	1,172
Depreciation and amortization	650	582	559
Taxes other than income taxes	248	262	282
Impairment charges	0	0	131
Estimated loss on regulatory disallowance	0	88	0
Total operating expenses	3,329	3,763	5,148
Operating Income	1,127	939	814
Other Income and (Expense):
Earnings from equity method investments	146	140	148
Interest expense, net of amounts capitalized	(341)	(310)	(263)
Other income (expense), net	66	57	53
Total other income and (expense)	(129)	(113)	(62)
Earnings Before Income Taxes	998	826	752
Income taxes	258	211	180
Net Income	$ 740	$ 615	$ 572

Consolidated Statements of In_4

Consolidated Statements of Income - GAS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Southern Company Gas
Excise taxes collected	$ 115	$ 133	$ 162

Consolidated Statements of Co_5

Consolidated Statements of Comprehensive Income - GAS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Income	$ 4,260	$ 3,849	$ 3,428
Qualifying hedges:
Changes in fair value, net of tax	(5)	(41)	(60)
Reclassification adjustment for amounts included in net income, net of tax	80	69	73
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	23	(39)	48
Reclassification adjustment for amounts included in net income, net of tax	1	1	10
Total other comprehensive income (loss)	99	(10)	71
Comprehensive Income	4,500	3,966	3,595
Southern Company Gas
Net Income	740	615	572
Qualifying hedges:
Changes in fair value, net of tax	(9)	(45)	13
Reclassification adjustment for amounts included in net income, net of tax	30	46	(24)
Pension and other postretirement benefit plans:
Benefit plan net gain (loss), net of tax	11	(15)	18
Reclassification adjustment for amounts included in net income, net of tax	0	(1)	0
Total other comprehensive income (loss)	32	(15)	7
Comprehensive Income	$ 772	$ 600	$ 579

Consolidated Statements of Co_6

Consolidated Statements of Comprehensive Income - GAS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Qualifying hedges, change in fair value, tax	$ (2)	$ (17)	$ (19)
Qualifying hedges, reclassification adjustment, tax	28	27	23
Pension and other postretirement benefit plans, gain (loss), tax	10	(14)	18
Reclassification adjustment for amounts included in net income, tax	0	0	3
Southern Company Gas
Qualifying hedges, change in fair value, tax	(3)	(18)	5
Qualifying hedges, reclassification adjustment, tax	12	19	(9)
Pension and other postretirement benefit plans, gain (loss), tax	5	(7)	8
Reclassification adjustment for amounts included in net income, tax	$ (1)	$ 0	$ 0

Consolidated Statements of Ca_5

Consolidated Statements of Cash Flows - GAS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Consolidated net income	$ 4,260	$ 3,849	$ 3,428
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	5,266	4,986	4,064
Deferred income taxes	536	63	670
Natural gas cost under recovery – long-term	0	0	207
Other, net	(39)	(138)	226
Changes in certain current assets and liabilities —
-Receivables	(372)	482	(771)
-Natural gas cost under recovery	0	108	158
-Other current assets	(47)	(106)	(186)
-Accounts payable	492	(863)	1,021
-Other current liabilities	145	191	153
Net cash provided from operating activities	9,788	7,553	6,302
Investing Activities:
Property additions	(8,955)	(9,095)	(7,923)
Cost of removal, net of salvage	(632)	(592)	(649)
Change in construction payables, net	106	18	203
Proceeds from dispositions	369	164	275
Other investing activities	(164)	(43)	(133)
Net cash used for investing activities	(9,400)	(9,668)	(8,430)
Financing Activities:
Increase (decrease) in notes payable, net		973
Increase (decrease) in notes payable, net	(648)		(337)
Proceeds —
Short-term borrowings	700	350	2,650
Redemptions and repurchases —
Short-term borrowings	(1,020)	(1,630)	(1,150)
Payment of common stock dividends	(2,954)	(3,035)	(2,907)
Other financing activities	(181)	(139)	(145)
Net cash provided from (used for) financing activities	(208)	999	2,336
Net Change in Cash, Cash Equivalents, and Restricted Cash	180	(1,116)	208
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	921	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Year	1,101	921	2,037
Cash paid during the period for —
Interest, net of amounts capitalized	2,538	2,184	1,758
Income taxes, net	176	132	146
Noncash transactions — Accrued property additions at year-end	1,199	1,027	1,024
Southern Company Gas
Operating Activities:
Consolidated net income	740	615	572
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	643	582	558
Deferred income taxes	132	126	17
Impairment charges	0	0	131
Natural gas cost under recovery – long-term	0	0	207
Estimated loss on regulatory disallowance	0	(96)	0
Other, net	3	(74)	(24)
Changes in certain current assets and liabilities —
-Receivables	28	431	(345)
-Natural gas for sale, net of temporary LIFO liquidation	32	19	(77)
-Prepaid income taxes	63	(11)	19
-Natural gas cost under recovery	0	108	158
-Other current assets	(52)	(17)	(6)
-Accounts payable	(6)	(276)	299
-Natural gas cost over recovery	(21)	214	0
-Other current liabilities	(10)	(51)	10
Net cash provided from operating activities	1,552	1,762	1,519
Investing Activities:
Property additions	(1,541)	(1,561)	(1,533)
Cost of removal, net of salvage	(88)	(104)	(112)
Change in construction payables, net	(19)	(38)	65
Investments in unconsolidated subsidiaries	(82)	(11)	(165)
Proceeds from dispositions	3	42	150
Other investing activities	16	16	15
Net cash used for investing activities	(1,711)	(1,656)	(1,580)
Financing Activities:
Increase (decrease) in notes payable, net	40
Increase (decrease) in notes payable, net		(153)	(341)
Proceeds —
Senior notes	450	500	500
First mortgage bonds	275	275	175
Short-term borrowings	0	0	50
Other long-term debt	8	37	22
Redemptions and repurchases —
First mortgage bonds	0	(50)	0
Short-term borrowings	0	(200)	(150)
Medium-term notes	0	(350)	(46)
Capital contributions from parent company	16	373	406
Payment of common stock dividends	(605)	(585)	(519)
Other financing activities	(16)	(1)	(1)
Net cash provided from (used for) financing activities	168	(154)	96
Net Change in Cash, Cash Equivalents, and Restricted Cash	9	(48)	35
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	35	83	48
Cash, Cash Equivalents, and Restricted Cash at End of Year	44	35	83
Cash paid during the period for —
Interest, net of amounts capitalized	329	291	258
Income taxes, net	59	91	208
Noncash transactions — Accrued property additions at year-end	$ 113	$ 139	$ 177

Consolidated Statements of Ca_6

Consolidated Statements of Cash Flows - GAS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net cash paid for capitalized interest	$ 103	$ 132	$ 103
Southern Company Gas
Net cash paid for capitalized interest	$ 21	$ 16	$ 10

Consolidated Balance Sheets - G

Consolidated Balance Sheets - GAS - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 1,070	$ 748
Receivables —
Customer accounts	2,228	2,030
Unbilled revenues	825	786
Other accounts and notes	597	519
Accumulated provision for uncollectible accounts	(74)	(68)
Natural gas for sale	388	420
Prepaid expenses	294	406
Other regulatory assets	804	1,120
Other current assets	476	533
Total current assets	10,694	10,432
Property, Plant, and Equipment:
In service	137,143	128,428
Less: Accumulated depreciation	40,126	37,725
Plant in service, net of depreciation	97,017	90,703
Construction work in progress	6,389	7,784
Total property, plant, and equipment	104,689	99,844
Other Property and Investments:
Goodwill	5,161	5,161
Equity investments in unconsolidated subsidiaries	1,416	1,368
Other intangible assets, net of amortization	332	368
Miscellaneous property and investments	668	665
Other Property and Investments	10,198	9,986
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,386	1,432
Prepaid pension costs	2,674	2,079
Other regulatory assets, deferred	7,037	6,264
Other deferred charges and assets	1,467	1,468
Total deferred charges and other assets	19,599	19,069
Total Assets	145,180	139,331
Current Liabilities:
Securities due within one year	4,718	2,476
Notes payable	1,338	2,314
Accounts payable —
Customer deposits	486	503
Accrued compensation	1,261	1,151
Natural gas cost over recovery	193	214
Other regulatory liabilities	369	141
Other current liabilities	1,100	1,029
Total current liabilities	15,993	13,467
Long-Term Debt	58,768	57,210
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	11,730	10,990
Deferred credits related to income taxes	4,434	4,674
Employee benefit obligations	1,011	1,115
Operating lease obligations	1,253	1,307
Other cost of removal obligations	2,016	1,957
Other deferred credits and liabilities	1,350	1,031
Total deferred credits and other liabilities	33,745	33,429
Total Liabilities	108,506	104,106
Common Stockholders' Equity:
Paid-in capital	14,149	13,775
Retained earnings (accumulated deficit)	13,750	12,482
Accumulated other comprehensive income	(78)	(177)
Total common stockholders' equity	33,208	31,444
Total Liabilities and Stockholders' Equity	145,180	139,331
Commitments and Contingent Matters
Southern Company Gas
Current Assets:
Cash and cash equivalents	43	33
Receivables —
Customer accounts	399	405
Unbilled revenues	244	261
Other accounts and notes	45	47
Accumulated provision for uncollectible accounts	(33)	(44)
Natural gas for sale	388	420
Prepaid expenses	45	107
Other regulatory assets	187	141
Other current assets	121	116
Total current assets	1,439	1,486
Property, Plant, and Equipment:
In service	22,338	20,840
Less: Accumulated depreciation	5,887	5,534
Plant in service, net of depreciation	16,451	15,306
Construction work in progress	1,057	1,110
Total property, plant, and equipment	17,508	16,416
Other Property and Investments:
Goodwill	5,015	5,015
Equity investments in unconsolidated subsidiaries	1,279	1,235
Other intangible assets, net of amortization	9	16
Miscellaneous property and investments	25	25
Other Property and Investments	6,328	6,291
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	38	47
Prepaid pension costs	191	158
Other regulatory assets, deferred	481	504
Other deferred charges and assets	192	181
Total deferred charges and other assets	902	890
Total Assets	26,177	25,083
Current Liabilities:
Securities due within one year	302	0
Notes payable	455	415
Accounts payable —
Affiliated and other	437	424
Customer deposits	98	126
Accrued taxes	85	77
Accrued compensation	129	112
Natural gas cost over recovery	193	214
Other regulatory liabilities	7	19
Other current liabilities	237	232
Total current liabilities	2,018	1,708
Long-Term Debt	8,229	7,833
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	1,796	1,671
Deferred credits related to income taxes	755	759
Employee benefit obligations	78	110
Operating lease obligations	30	40
Other cost of removal obligations	1,846	1,771
Accrued environmental remediation	198	192
Other deferred credits and liabilities	231	196
Total deferred credits and other liabilities	4,934	4,739
Total Liabilities	15,181	14,280
Common Stockholders' Equity:
Paid-in capital	10,863	10,836
Retained earnings (accumulated deficit)	85	(49)
Accumulated other comprehensive income	48	16
Total common stockholders' equity	10,996	10,803
Total Liabilities and Stockholders' Equity	26,177	25,083
Commitments and Contingent Matters
Southern Company Gas | Related Party
Accounts payable —
Affiliated and other	$ 75	$ 89

Consolidated Balance Sheets -_5

Consolidated Balance Sheets - GAS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Other intangible assets, amortization	$ 412	$ 376
Common Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 5	$ 5
Common stock, shares authorized (in shares)	1,500,000,000	1,500,000,000
Southern Company Gas
Other intangible assets, amortization	$ 173	$ 166
Common Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares outstanding (in shares)	100	100

Consolidated Statements of Comm

Consolidated Statements of Common Stockholders' Equity - GAS - USD ($) $ in Millions	Total	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Southern Company Gas	Southern Company Gas Paid-In Capital	Southern Company Gas Retained Earnings	Southern Company Gas Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2021					$ 9,916	$ 10,024	$ (132)	$ 24
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	$ 3,428				572		572
Capital contributions from parent company					421	421
Other comprehensive income (loss)	71			$ 71	7			7
Cash dividends on common stock	(2,907)		$ (2,907)		(519)		(519)
Other	(6)	$ 9	(8)	(1)
Ending balance at Dec. 31, 2022					10,397	10,445	(79)	31
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	3,849				615		615
Capital contributions from parent company					391	391
Other comprehensive income (loss)	(10)			(10)	(15)			(15)
Cash dividends on common stock	(3,035)		(3,035)		(585)		(585)
Other	(5)	(1)	3
Ending balance at Dec. 31, 2023	31,444				10,803	10,836	(49)	16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	4,260				740		740
Capital contributions from parent company					27	27
Other comprehensive income (loss)	99			99	32			32
Cash dividends on common stock	(3,133)		(3,133)		(605)		(605)
Other	19	$ 19	$ 0	$ 0	(1)		(1)
Ending balance at Dec. 31, 2024	$ 33,208				$ 10,996	$ 10,863	$ 85	$ 48

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES General Southern Company is the parent company of three traditional electric operating companies, as well as Southern Power, Southern Company Gas, SCS, Southern Linc, Southern Holdings, Southern Nuclear, PowerSecure, and other direct and indirect subsidiaries. The traditional electric operating companies – Alabama Power, Georgia Power, and Mississippi Power – are vertically integrated utilities providing electric service in three Southeastern states. Southern Power develops, constructs, acquires, owns, operates, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through natural gas distribution utilities, including Nicor Gas (Illinois), Atlanta Gas Light (Georgia), Virginia Natural Gas, and Chattanooga Gas (Tennessee). Southern Company Gas is also involved in several other complementary businesses including gas pipeline investments and gas marketing services. SCS, the system service company, provides, at cost, specialized services to Southern Company and its subsidiary companies. Southern Linc provides digital wireless communications for use by Southern Company and its subsidiary companies and also markets these services to the public and provides fiber optics services within the Southeast. Southern Holdings is an intermediate holding company subsidiary. Southern Nuclear operates and provides services to the Southern Company system's nuclear power plants, including Alabama Power's Plant Farley and Georgia Power's Plants Hatch and Vogtle. PowerSecure develops distributed energy and resilience solutions and deploys microgrids for commercial, industrial, governmental, and utility customers. The Registrants' financial statements reflect investments in subsidiaries on a consolidated basis. Intercompany transactions have been eliminated in consolidation. The equity method is used for investments in entities in which a Registrant has significant influence but does not have control and for VIEs where a Registrant has an equity investment but is not the primary beneficiary. Southern Power has controlling ownership in certain legal entities for which the contractual provisions represent profit-sharing arrangements because the allocations of cash distributions and tax benefits are not based on fixed ownership percentages. For these arrangements, the noncontrolling interest is accounted for under a balance sheet approach utilizing the HLBV method. The HLBV method calculates each partner's share of income based on the change in net equity the partner can legally claim in an HLBV at the end of the period compared to the beginning of the period. See "Variable Interest Entities" herein and Note 7 for additional information. The traditional electric operating companies, Southern Power, certain subsidiaries of Southern Company Gas, and certain other subsidiaries are subject to regulation by the FERC, and the traditional electric operating companies and the natural gas distribution utilities are also subject to regulation by their respective state PSCs or other applicable state regulatory agencies. As such, the respective financial statements of the applicable Registrants reflect the effects of rate regulation in accordance with GAAP and comply with the accounting policies and practices prescribed by relevant state PSCs or other applicable state regulatory agencies. The preparation of financial statements in conformity with GAAP requires the use of estimates, and the actual results may differ from those estimates. Certain prior years' data presented in the financial statements have been reclassified to conform to the current year presentation. These reclassifications had no impact on the Registrants' results of operations, financial position, or cash flows. Recently Adopted Accounting Standards In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (ASU 2023-07), which requires entities to disclose significant segment expenses, other segment items, the title and position of the CODM, and information related to how the CODM assesses segment performance and allocates resources, among certain other required disclosures. Additionally, previous annual disclosures will be required in interim periods. The Registrants adopted ASU 2023-07 and applied the guidance retrospectively effective for the fiscal year beginning January 1, 2024. ASU 2023-07 will be applied retrospectively for the interim periods beginning January 1, 2025. See Note 16 for additional information and related disclosures. Affiliate Transactions The traditional electric operating companies, Southern Power, and Southern Company Gas have agreements with SCS under which certain of the following services are rendered to them at direct or allocated cost: general executive and advisory, general and design engineering, operations, purchasing, accounting, finance, treasury, legal, tax, information technology, marketing, auditing, insurance and pension administration, human resources, systems and procedures, digital wireless communications, cellular tower space, and other services with respect to business and operations, construction management, and Southern Company power pool transactions. These costs are primarily included in other operations and maintenance expenses or capitalized to property, plant, and equipment. Costs for these services from SCS in 2024, 2023, and 2022 were as follows: Alabama Georgia Mississippi Southern Southern Company Gas (in millions) 2024 $ 813 $ 1,197 $ 130 $ 93 $ 290 2023 611 857 113 86 261 2022 549 762 115 86 262 Alabama Power and Georgia Power also have agreements with Southern Nuclear under which Southern Nuclear renders the following nuclear-related services at cost: general executive and advisory services; general operations, management, and technical services; administrative services including procurement, accounting, employee relations, systems, and procedures services; strategic planning and budgeting services; and other services with respect to business and operations. These costs are primarily included in other operations and maintenance expenses or capitalized to property, plant, and equipment. Costs for these services in 2024, 2023, and 2022 amounted to $260 million, $251 million, and $267 million, respectively, for Alabama Power and $835 million, $899 million, and $895 million, respectively, for Georgia Power. Cost allocation methodologies used by SCS and Southern Nuclear prior to the repeal of the Public Utility Holding Company Act of 1935, as amended, were approved by the SEC. Subsequently, additional cost allocation methodologies have been reported to the FERC and management believes they are reasonable. The FERC permits services to be rendered at cost by system service companies. Alabama Power's and Georgia Power's power purchases from affiliates through the Southern Company power pool are included in purchased power, affiliates on their respective statements of income. 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 Southern (in millions) 2024 $ 8 $ 17 2023 4 13 2022 4 29 Georgia Power has entered into several PPAs with Southern Power and one PPA with Mississippi Power for capacity and energy. Georgia Power's total expenses associated with these PPAs were $203 million, $143 million, and $151 million in 2024, 2023, and 2022, respectively. Southern Power's total revenues from all PPAs with Georgia Power, included in wholesale revenue affiliates on Southern Power's consolidated statements of income, were $149 million, $145 million, and $154 million for 2024, 2023, and 2022, respectively. Included within these revenues were affiliate PPAs accounted for as operating leases, which totaled $121 million, $116 million, and $116 million for 2024, 2023, and 2022, respectively. Mississippi Power's total revenues from its PPA with Georgia Power, which commenced in 2024, were $60 million in 2024 and are included in wholesale revenue affiliates on Mississippi Power's statements of income. See Notes 2 and 9 for additional information. SCS (as agent for Alabama Power, Georgia Power, and Southern Power) and certain subsidiaries of Southern Company Gas have long-term interstate natural gas transportation agreements with SNG that are governed by the terms and conditions of SNG's natural gas tariff and are subject to FERC regulation. See Note 7 under "Southern Company Gas" for additional information. Transportation costs under these agreements in 2024, 2023, and 2022 were as follows: Alabama Georgia Southern Southern Company Gas (in millions) 2024 $ 13 $ 103 $ 35 $ 28 2023 12 101 34 28 2022 18 99 37 27 SCS, as agent for the traditional electric operating companies and Southern Power, has agreements with certain subsidiaries of Southern Company Gas to purchase natural gas. Natural gas purchases made under these agreements were immaterial for Alabama Power, Georgia Power, Mississippi Power, and Southern Power for all periods presented. Alabama Power and Mississippi Power jointly own Plant Greene County. The companies have an agreement under which Alabama Power operates Plant Greene County and Mississippi Power reimburses Alabama Power for its proportionate share of non-fuel operations and maintenance expenses, which totaled $7 million, $5 million, and $6 million in 2024, 2023, and 2022, respectively. See Notes 2 and 5 under "Mississippi Power – Integrated Resource Plans" and "Joint Ownership Agreements," respectively, for additional information. Alabama Power, Georgia Power, and Mississippi Power each have agreements with PowerSecure for equipment purchases and/or services related to utility infrastructure construction, distributed energy, and energy efficiency projects. Costs under these agreements were immaterial for all periods presented. Southern Company Gas has a $74 million contract with the U.S. General Services Administration to increase energy efficiency at certain federal buildings across Georgia, which is expected to be completed in 2025. Southern Company Gas engaged PowerSecure to provide the majority of the construction services under the contract. During 2024, 2023, and 2022, Southern Company Gas paid $13 million, $29 million, and $10 million, respectively, to PowerSecure related to this agreement. See Note 7 under "SEGCO" for information regarding Alabama Power's and Georgia Power's equity method investment in SEGCO and related affiliate purchased power costs, as well as Alabama Power's gas pipeline ownership agreement with SEGCO. Southern Power has several agreements with SCS for transmission services, which are billed to Southern Power based on the Southern Company Open Access Transmission Tariff as filed with the FERC. Transmission services purchased by Southern Power from SCS totaled $25 million, $33 million, and $39 million for 2024, 2023, and 2022, respectively, and were charged to other operations and maintenance expenses in Southern Power's consolidated statements of income. The traditional electric operating companies and Southern Power may jointly enter into various types of wholesale energy, natural gas, and certain other contracts, either directly or through SCS as agent. Each participating company may be jointly and severally liable for the obligations incurred under these agreements. See Note 14 under "Contingent Features" for additional information. Southern Power and the traditional electric operating companies generally settle amounts related to the above transactions on a monthly basis in the month following the performance of such services or the purchase or sale of electricity. See "Revenues – Southern Power" herein for additional information. The traditional electric operating companies, Southern Power, and Southern Company Gas provide incidental services to and receive such services from other Southern Company subsidiaries which are generally minor in duration and amount. Except as described herein, the traditional electric operating companies, Southern Power, and Southern Company Gas neither provided nor received any material services to or from affiliates in any year presented. Regulatory Assets and Liabilities The traditional electric operating companies and the natural gas distribution utilities are subject to accounting requirements for the effects of rate regulation. Regulatory assets represent probable future revenues associated with certain costs that are expected to be recovered from customers through the ratemaking process. Regulatory liabilities represent costs recovered that are expected to be incurred in the future or probable future reductions in revenues associated with amounts that are expected to be credited to customers through the ratemaking process. In the event that a portion of a traditional electric operating company's or a natural gas distribution utility's operations is no longer subject to applicable accounting rules for rate regulation, such company would be required to write off to income or reclassify to AOCI related regulatory assets and liabilities that are not specifically recoverable through regulated rates. In addition, the traditional electric operating company or the natural gas distribution utility would be required to determine if any impairment to other assets, including plant, exists and write down the assets, if impaired, to their fair values. All regulatory assets and liabilities are to be reflected in rates. See Note 2 for additional information including details of regulatory assets and liabilities reflected in the balance sheets for Southern Company, the traditional electric operating companies, and Southern Company Gas. Revenues The Registrants generate revenues from a variety of sources which are accounted for under various revenue accounting guidance, including revenue from contracts with customers, lease, derivative, and regulatory accounting. See Notes 4, 9, and 14 for additional information. Traditional Electric Operating Companies The majority of the revenues of the traditional electric operating companies are generated from contracts with retail electric customers. These revenues, generated from the integrated service to deliver electricity when and if called upon by the customer, are recognized as a single performance obligation satisfied over time, at a tariff rate, and as electricity is delivered to the customer during the month. Unbilled revenues related to retail sales are recognized for estimated deliveries of electricity not yet billed to these customers from the last bill date to the end of the accounting period. Retail rates may include provisions to adjust revenues for fluctuations in fuel costs, fuel hedging, the energy component of purchased power costs, and certain other costs. Revenues are adjusted for differences between these actual costs and amounts billed in current regulated rates. Under or over recovered regulatory clause revenues are recorded in the balance sheets and are recovered from or returned to customers, respectively, through adjustments to the billing factors. See Note 2 for additional information regarding regulatory matters of the traditional electric operating companies. Wholesale capacity revenues from PPAs are recognized in amounts billable under the contract terms. Energy and other revenues are generally recognized as services are provided. The contracts for capacity and energy in a wholesale PPA have multiple performance obligations where the contract's total transaction price is allocated to each performance obligation based on the standalone selling price. The standalone selling price is primarily determined by the price charged to customers for the specific goods or services transferred with the performance obligations. Generally, the traditional electric operating companies recognize revenue as the performance obligations are satisfied over time as electricity is delivered to the customer or as generation capacity is available to the customer. For both retail and wholesale revenues, the traditional electric operating companies have elected to recognize revenue for their sales of electricity and capacity using the invoice practical expedient as they generally have a right to consideration in an amount that corresponds directly with the value to the customer of the performance completed to date and that may be invoiced. Payment for goods and services rendered is typically due in the subsequent month following satisfaction of the Registrants' performance obligation. Southern Power Southern Power sells capacity and energy at rates specified under contractual terms in long-term PPAs. These PPAs are accounted for as leases, normal sale derivatives, or contracts with customers. Capacity revenues from PPAs classified as operating leases are recognized on a straight-line basis over the term of the agreement. Energy revenues are recognized in the period the energy is delivered. Capacity revenues from PPAs classified as sales-type leases are recognized by accounting for interest income on the net investment in the lease. Southern Power's non-lease contracts commonly include capacity and energy which are considered separate performance obligations. In these contracts, the total transaction price is allocated to each performance obligation based on the standalone selling price. The standalone selling price is primarily determined by the price charged to customers for the specific goods or services transferred with the performance obligations. Generally, Southern Power recognizes revenue as the performance obligations are satisfied over time, as electricity is delivered to the customer or as generation capacity is made available to the customer. Southern Power generally has a right to consideration in an amount that corresponds directly with the value to the customer of the performance completed to date and may recognize revenue in the amount to which the entity has a right to invoice. Payment for goods and services rendered is typically due in the subsequent month following satisfaction of Southern Power's performance obligation. When multiple contracts exist with the same counterparty, the revenues from each contract are accounted for as separate arrangements. Southern Power may also enter into contracts to sell short-term capacity in the wholesale electricity markets. These sales are generally classified as mark-to-market derivatives and net unrealized gains and losses on such contracts are recorded in wholesale revenues. See Note 14 and "Financial Instruments" herein for additional information. Southern Company Gas Southern Company Gas records revenues when goods or services are provided to customers. Those revenues are based on rates approved by the state regulatory agencies of the natural gas distribution utilities.The majority of the revenues of Southern Company Gas are generated from contracts with natural gas distribution customers. Revenues from this integrated service to deliver gas when and if called upon by the customer are recognized as a single performance obligation satisfied over time and are recognized at a tariff rate as gas is delivered to the customer during the month. Revenues from sales and transportation services are recognized in the same period in which the related volumes are delivered to customers. Revenues from residential and certain commercial and industrial customers are recognized on the basis of scheduled meter readings. Additionally, unbilled revenues are recognized for estimated deliveries of gas not yet billed to these customers, from the last bill date to the end of the accounting period. For other commercial and industrial customers, revenues are based on actual deliveries through the end of the period. Southern Company Gas has elected to recognize revenue for sales of gas using the invoice practical expedient as it generally has a right to consideration in an amount that corresponds directly with the value to the customer of the performance completed to date and that may be invoiced. Payment for goods and services rendered is typically due in the subsequent month following satisfaction of Southern Company Gas' performance obligation. Gas Distribution Operations Atlanta Gas Light operates in a deregulated natural gas market wher eby M arketers, rather than a traditional utility, sell natural gas to end-use customers in Georgia and handle customer billing functions. As required by the Georgia PSC, Atlanta Gas Light bills Marketers in equal monthly installments for each residential, commercial, and industrial end-use customer's distribution costs as well as for capacity costs utilizing a seasonal rate design for the calculation of each residential end-use customer's annual straight-fixed-variable charge, which reflects the historic volumetric usage pattern for the entire residential class. With the exception of Atlanta Gas Light, the natural gas distribution utilities have rate structures that include volumetric rate designs that allow the opportunity to recover certain costs based on gas usage. The tariffs for the natural gas distribution utilities include provisions which allow for the recognition of certain revenues prior to the time such revenues are billed to customers. These provisions are referred to as alternative revenue programs and provide for the recognition of certain revenues prior to billing, as long as the amounts recognized will be collected from customers within 24 months of recognition. Revenue related to alternative revenue programs was $43 million, $20 million, and $(5) million in 2024, 2023, and 2022, respectively. These programs primarily consist of: • Weather normalization adjustments – reduce customer bills when winter weather is colder than normal and increase customer bills when weather is warmer than normal and are included in the tariffs for Virginia Natural Gas and Chattanooga Gas; • Revenue normalization mechanisms – mitigate the impact of conservation and declining customer usage and are contained in the tariffs for Virginia Natural Gas and Nicor Gas; and • Revenue true-up adjustment – included within the provisions of the GRAM program in which Atlanta Gas Light participates as a short-term alternative to formal rate case filings, the revenue true-up feature provides for a positive (or negative) adjustment to record revenue in the amount of any variance to budgeted revenues, which are submitted and approved annually as a requirement of GRAM. Such adjustments are reflected in customer billings in a subsequent program year. Gas Marketing Services Gas marketing services is comprised of several choice-based natural gas marketers operating in various deregulated jurisdictions. While gas marketing services follows the same general approach to revenue recognition described for Southern Company Gas above, it recognizes revenues on certain 12-month utility-bill management contracts as the lesser of cumulative earned or cumulative billed amounts. Concentration of Revenue Southern Company, Alabama Power, Georgia Power, Mississippi Power (with the exception of its full requirements cost-based MRA electric tariffs described below), Southern Power, and Southern Company Gas each have a diversified base of customers and no single customer comprises 10% or more of each company's revenues. Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based MRA electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 13.9% of Mississippi Power's total operating revenues in 2024. Fuel Costs Fuel costs for the traditional electric operating companies and Southern Power are expensed as the fuel is used. Fuel expense generally includes fuel transportation costs and the cost of purchased emissions allowances as they are used. For Alabama Power and Georgia Power, fuel expense also includes the amortization of the cost of nuclear fuel. For the traditional electric operating companies, fuel costs also include gains and/or losses from fuel-hedging programs as approved by their respective state PSCs. Cost of Natural Gas Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, Southern Company Gas charges its utility customers for natural gas consumed using natural gas cost recovery mechanisms set by the applicable state regulatory agencies. Under these mechanisms, all prudently-incurred natural gas costs are passed through to customers without markup, subject to regulatory review. Southern Company Gas defers or accrues the difference between the actual cost of natural gas and the amount of commodity revenue earned in a given period such that no operating income is recognized related to these costs. The deferred or accrued amount is either billed or refunded to customers prospectively through adjustments to the commodity rate. Deferred and accrued natural gas costs are included in the balance sheets as regulatory assets and regulatory liabilities, respectively. Southern Company Gas' gas marketing services' customers are charged for actual or estimated natural gas consumed. Within cost of natural gas, Southern Company Gas also includes costs of lost and unaccounted for gas and gains and losses associated with certain derivatives. Income Taxes The Registrants use the liability method of accounting for deferred income taxes and provide deferred income taxes for all significant income tax temporary differences. In accordance with regulatory requirements, deferred federal ITCs for the traditional electric operating companies are amortized over the average life of the related property, with such amortization normally applied as a credit to reduce depreciation and amortization in the statements of income. Southern Power's and the natural gas distribution utilities' deferred federal ITCs, as well as certain state ITCs for Nicor Gas, are amortized to income tax expense over the life of the respective asset. Under current tax law, certain projects at Southern Power related to the construction of renewable facilities are eligible for federal ITCs. Southern Power estimates eligible costs which, as they relate to acquisitions, may not be finalized until the allocation of the purchase price to assets has been finalized. Southern Power applies the deferred method to ITCs, whereby the ITCs are recorded as a deferred credit and amortized to income tax expense over the life of the respective asset. Furthermore, the tax basis of the asset is reduced by 50% of the ITCs received, which, together with the deferred credit, results in a net deferred tax asset. Southern Power has elected to recognize the tax benefit of this basis difference as a reduction to income tax expense in the year in which the plant reaches commercial operation. State ITCs are recognized as an income tax benefit in the period in which the credits are generated. In addition, certain projects are eligible for federal and state PTCs, which are recognized as an income tax benefit based on KWH production. Federal ITCs and PTCs, as well as state ITCs and other state tax credits available to reduce income taxes payable, were not fully utilized in 2024 and will be carried forward and utilized in future years. In addition, Southern Company is expected to have various state net operating loss (NOL) carryforwards for certain of its subsidiaries, including Mississippi Power and Southern Power, which would result in income tax benefits in the future, if utilized. See Note 10 under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" and " – Net Operating Loss Carryforwards" for additional information. In April 2024, the IRS issued final regulations related to the transferability of certain tax credits under the IRA. Southern Company and certain subsidiaries have tax credits that are eligible to be transferred at a discount to the generated credit value. The discount will be recorded as a reduction in tax credits recognized in the financial statements. See Note 10 under "Current and Deferred Income Taxes" for additional information. Under current tax law, Georgia Power is eligible to generate advanced nuclear PTCs for Plant Vogtle Units 3 and 4, which are recognized as an income tax benefit based on KWH production and are eligible to be transferred. Pursuant to the Vogtle Joint Ownership Agreements (as defined in Note 2 under "Georgia Power – Nuclear Construction – Cost and Schedule"), Georgia Power is purchasing advanced nuclear PTCs for Plant Vogtle Units 3 and 4 from the other Vogtle Owners. The gain recognized on the purchase of the joint owner PTCs is recognized as an income tax benefit. The Registrants recognize tax positions that are "more likely than not" of being sustained upon examination by the appropriate taxing authorities. See Note 10 under "Unrecognized Tax Benefits" for additional information. Other Taxes Taxes imposed on and collected from customers on behalf of governmental agencies are presented net on the Registrants' statements of income and are excluded from the transaction price in determining the revenue related to contracts with a customer. Southern Company Gas is taxed on its gas revenues by various governmental authorities, but is allowed to recover these taxes from its customers. Revenue taxes imposed on the natural gas distribution utilities are recorded at the amount charged to customers, which may include a small administrative fee, as operating revenues, and the related taxes imposed on Southern Company Gas are recorded as operating expenses on the statements of income. Revenue taxes included in operating expenses were $112 million, $129 million, and $158 million in 2024, 2023, and 2022, respectively. Allowance for Funds Used During Construction and Interest Capitalized The traditional electric operating companies and the natural gas distribution utilities record AFUDC, which represents the estimated debt and equity costs of capital funds that are necessary to finance the construction of new regulated facilities. While cash is not realized currently, AFUDC increases the revenue requirement and is recovered over the service life of the asset through a higher rate base and higher depreciation. The equity component of AFUDC is not taxable. Interest related to financing the construction of new facilities at Southern Power and new facilities not included in the traditional electric operating companies' and Southern Company Gas' regulated rates is capitalized in accordance with standard interest capitalization requirements. Total AFUDC and interest capitalized for the applicable Registrants in 2024, 2023, and 2022 was as follows: Southern Company Alabama Georgia (*) Southern Southern Company Gas (in millions) 2024 $ 339 $ 76 $ 209 $ 7 $ 47 2023 400 109 251 3 37 2022 327 90 213 — 24 (*) 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 through each unit's respective in-service date. The average AFUDC composite rates for 2024, 2023, and 2022 for the traditional electric operating companies and the natural gas distribution utilities were as follows: 2024 2023 2022 Alabama Power 8.1 % 8.1 % 7.9 % Georgia Power (a) 7.7 % 7.6 % 7.3 % Mississippi Power (b) — % — % 5.3 % Southern Company Gas: Atlanta Gas Light 7.7 % 7.4 % 7.6 % Chattanooga Gas 7.1 % 7.1 % 7.1 % Nicor Gas 5.6 % 4.6 % 2.0 % (a) Excludes AFUDC related to the construction of Plant Vogtle Units 3 and 4 in 2022 and 2023 and Plant Vogtle Unit 4 in 2024. See Note 2 under "Georgia Power – Nuclear Construction" for additional information. (b) Mississippi Power's AFUDC was immaterial in 2024 and 2023. Impairment of Long-Lived Assets The Registrants evaluate long-lived assets for impairment when events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. The determination of whether an impairment has occurred is based on either a specific regulatory disallowance, a sales transaction price that is less than the asset group's carrying amount, or an estimate of undiscounted future cash flows attributable to the asset group, as compared with the carrying amount of the assets. If an impairment has occurred, the amount of the impairment loss recognized is determined by either the amount of regulatory

REGULATORY MATTERS

REGULATORY MATTERS	12 Months Ended
	Dec. 31, 2024
Regulated Operations [Abstract]
REGULATORY MATTERS	REGULATORY MATTERS Regulatory Assets and Liabilities Details of regulatory assets and (liabilities) reflected in the balance sheets at December 31, 2024 and 2023 are provided in the following tables: Southern Company Alabama Power Georgia Power Mississippi Power Southern Company Gas (in millions) At December 31, 2024 AROs (*) $ 5,810 $ 1,906 $ 3,658 $ 248 $ — Retiree benefit plans (*) 2,605 680 892 134 44 Remaining net book value of retired assets 1,198 454 729 15 — Deferred income tax charges 927 264 634 27 — Storm damage 859 — 827 32 — Deferred depreciation 535 286 249 — — Environmental remediation (*) 249 — 16 — 233 Vacation pay (*) 224 85 112 12 15 Loss on reacquired debt 219 32 183 4 — Software and cloud computing costs 200 76 116 4 4 Under recovered regulatory clause revenues 167 119 — 17 31 Regulatory clauses 162 82 — — 80 Nuclear outage 92 39 53 — — Fuel-hedging (realized and unrealized) losses 69 23 29 17 — Qualifying repairs of natural gas distribution systems 53 — — — 53 Long-term debt fair value adjustment 52 — — — 52 Plant Daniel Units 3 and 4 23 — — 23 — Other regulatory assets 184 42 40 30 72 Deferred income tax credits (4,536) (1,398) (2,149) (219) (755) Other cost of removal obligations (1,176) 24 816 (170) (1,846) Over recovered regulatory clause revenues (285) (29) (52) — (204) Reliability reserves (188) (131) — (57) — Storm/property damage reserves (122) (70) — (52) — Nuclear fuel disposal cost recovery (100) (100) — — — Other regulatory liabilities (180) (28) (14) (6) (31) Total regulatory assets (liabilities), net $ 7,041 $ 2,356 $ 6,139 $ 59 $ (2,252) Southern Company Alabama Power Georgia Power Mississippi Power Southern Company Gas (in millions) At December 31, 2023 AROs ( * ) $ 5,733 $ 1,936 $ 3,505 $ 247 $ — Retiree benefit plans ( * ) 3,011 815 976 140 146 Remaining net book value of retired assets 1,357 499 841 17 — Deferred income tax charges 897 262 605 28 — Under recovered regulatory clause revenues 413 381 — 12 20 Fuel-hedging (realized and unrealized) losses 270 100 121 49 — Deferred depreciation 270 143 127 — — Environmental remediation ( * ) 255 — 20 — 235 Loss on reacquired debt 238 35 197 5 1 Vacation pay ( * ) 217 83 107 11 16 Software and cloud computing costs 150 59 84 2 5 Regulatory clauses 140 112 — — 28 Storm damage 92 — 54 38 — Nuclear outage 83 50 33 — — Long-term debt fair value adjustment 60 — — — 60 Qualifying repairs of natural gas distribution systems 40 — — — 40 Plant Daniel Units 3 and 4 25 — — 25 — Other regulatory assets 189 39 33 25 93 Deferred income tax credits (4,686) (1,506) (2,161) (241) (759) Other cost of removal obligations (1,312) 28 617 (186) (1,771) Over recovered regulatory clause revenues (287) (3) (46) — (238) Reliability reserves (179) (143) — (36) — Storm/property damage reserves (120) (76) — (44) — Other regulatory liabilities (333) (94) (23) (2) (101) Total regulatory assets (liabilities), net $ 6,523 $ 2,720 $ 5,090 $ 90 $ (2,225) (*) Generally not earning a return as they are excluded from rate base or are offset in rate base by a corresponding asset or liability. Unless otherwise noted, the following recovery and amortization periods for these regulatory assets and (liabilities) have been approved by the respective state PSC or regulatory agency: AROs and other cost of removal obligations – Generally recorded over the related property lives, which may range up to 64 years for Alabama Power, 54 years for Georgia Power, 67 years for Mississippi Power, and 85 years for Southern Company Gas. AROs and other cost of removal obligations are settled and trued up following completion of the related activities. Alabama Power is recovering CCR ARO expenditures over a 38-year period ending in 2054 through Rate CNP Compliance. Effective January 1, 2023, Georgia Power is recovering CCR ARO expenditures over four-year periods through its ECCR tariff. Prior to 2023, expenditures were recovered over three-year periods. See "Georgia Power – Rate Plans" herein and Note 6 for additional information. Retiree benefit plans – Recovered and amortized over the average remaining service period, which may range up to 14 years for Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas. Southern Company's balances also include amounts at SCS and Southern Nuclear that are allocated to the applicable regulated utilities. See Note 11 for additional information. Remaining net book value of retired assets – Alabama Power : Primarily represents the net book value of Plant Gorgas Unit 10 ($419 million at December 31, 2024) being amortized over 13 years (through 2037) and Plant Barry Unit 4 ($35 million at December 31, 2024) being amortized over 10 years (through 2034). See "Alabama Power – Environmental Accounting Order" herein for additional information. Georgia Power : Net book values of Plant Wansley Units 1 and 2 and Plant Hammond Units 3 and 4 (totaling $418 million and $302 million, respectively, at December 31, 2024) are being amortized over remaining periods between one Mississippi Power : Represents net book value of certain environmental compliance assets at Plant Watson and Plant Greene County. The retail portion is being amortized over 10 years (through 2033) and the wholesale portion is being amortized over 10 years (through 2034). See "Mississippi Power – Environmental Compliance Overview Plan" herein for additional information. Deferred income tax charges and credits – Charges are recovered and credits are primarily amortized over the related property lives, which may range up to 64 years for Alabama Power, 54 years for Georgia Power, 67 years for Mississippi Power, and 85 years for Southern Company Gas. See Note 10 for additional information. These accounts include certain deferred income tax assets and liabilities not subject to normalization, as described further below: Alabama Power : Related amounts at December 31, 2024 include excess federal deferred income tax liabilities that are available for the benefit of customers in 2025, as discussed under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" herein. Remaining amounts are being recovered and amortized ratably over the related property lives. Georgia Power : Related amounts at December 31, 2024 include $135 million of deferred income tax assets related to construction costs for Plant Vogtle Units 3 and 4 being recovered over 10 years (through 2034) and $102 million of excess state deferred income tax liabilities that will be returned to customers in 2025. See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4. Southern Company Gas : Related amounts at December 31, 2024 include $24 million of deferred income tax liabilities being amortized over periods generally not exceeding five years, primarily related to excess state deferred income tax liabilities. See "Southern Company Gas – Rate Proceedings" herein for additional information. Storm damage – See "Georgia Power – Storm Damage Recovery" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Mississippi Power's balance represents deferred storm costs associated with Hurricanes Ida and Zeta being recovered through PEP over seven years (through 2029). Deferred depreciation – Alabama Power : Represents deferred depreciation for Plant Barry Unit 5 ($114 million at December 31, 2024) and Plant Barry common coal assets ($48 million at December 31, 2024) to be amortized until 2036 beginning when Plant Barry Unit 5 is retired and Plant Gaston Unit 5 coal assets ($124 million at December 31, 2024) to be amortized until 2039 beginning when the assets are retired. Georgia Power : Represents deferred depreciation for Plant Scherer Units 1 through 3 ($139 million at December 31, 2024) to be amortized over six years beginning in 2029 and Plant Bowen Units 1 and 2 ($80 million at December 31, 2024) to be amortized over four years beginning in 2031, both as approved under Georgia Power's 2022 ARP, and Plant Vogtle Unit 3 and common facilities ($29 million at December 31, 2024) being amortized over 10 years (through 2034). See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4. Environmental remediation – Effective January 1, 2023, Georgia Power is recovering $5 million annually for environmental remediation under the 2022 ARP. Southern Company Gas' costs are recovered through environmental cost recovery mechanisms when the remediation work is performed. See Note 3 under "Environmental Remediation" for additional information. Vacation pay – Recorded as earned by employees and recovered as paid, generally within one year. Includes both vacation and banked holiday pay, if applicable. Loss on reacquired debt – Recovered over either the remaining life of the original issue or, if refinanced, over the remaining life of the new issue. At December 31, 2024, the remaining amortization periods do not exceed 23 years for Alabama Power, 28 years for Georgia Power, 17 years for Mississippi Power, and three years for Southern Company Gas. Software and cloud computing costs – Represents certain deferred operations and maintenance costs associated with software and cloud computing projects. For Alabama Power, costs are amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). For Georgia Power, costs incurred through 2022 are being amortized over five years (through 2027), and the recovery period for costs incurred after 2022 will be determined in its next base rate case. For Mississippi Power, the recovery period will be determined in Mississippi Power's annual PEP filing process following the completion of the projects and is expected to begin no earlier than 2026. For Southern Company Gas, costs are being amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). Under and over recovered regulatory clause revenues – Alabama Power : Balances are recorded monthly and expected to be recovered over periods of up to six years, with the majority expected to be recovered within one year. See "Alabama Power – Rate CNP PPA," " – Rate CNP Compliance," and " – Rate ECR" herein for additional information. Georgia Power : Balances are recorded monthly and expected to be recovered or returned within two years. See "Georgia Power – Rate Plans" herein for additional information. Mississippi Power : At December 31, 2024, $17 million is expected to be recovered through various rate recovery mechanisms over a period to be determined in future rate filings. See "Mississippi Power – Ad Valorem Tax Adjustment" herein for additional information. Southern Company Gas : Balances are recorded and recovered or amortized over periods generally not exceeding five years. In addition to natural gas cost recovery mechanisms, the natural gas distribution utilities have various other cost recovery mechanisms for the recovery of costs, including those related to infrastructure replacement programs. Regulatory clauses – Alabama Power : Effective January 1, 2023, balance is being amortized through Rate RSE over a five-year period ending in 2027. Southern Company Gas : Represents amounts related to Nicor Gas' volume balancing adjustment rider expected to be recovered over a period of less than two years. Nuclear outage – Costs are deferred to a regulatory asset when incurred and amortized over a subsequent period of 18 months for Alabama Power and up to 24 months for Georgia Power. See Note 5 for additional information. Fuel-hedging (realized and unrealized) losses and gains – Assets and liabilities are recorded over the life of the underlying hedged purchase contracts. Upon final settlement, actual costs incurred are recovered through the applicable traditional electric operating company's fuel cost recovery mechanism. Purchase contracts generally do not exceed three and a half years for Alabama Power, three years for Georgia Power, and four years for Mississippi Power. Immaterial amounts for fuel-hedging gains at December 31, 2024 and 2023 are included in other regulatory liabilities. Qualifying repairs of natural gas distribution systems – Represents deferred costs of certain repairs at Atlanta Gas Light being amortized over 20 years. Long-term debt fair value adjustment – Recovered over the remaining lives of the original debt issuances at acquisition, which range up to 14 years at December 31, 2024. Plant Daniel Units 3 and 4 – Represents the difference between Mississippi Power's revenue requirement for Plant Daniel Units 3 and 4 under purchase accounting and operating lease accounting. At December 31, 2024, consists of the $16 million retail portion being amortized through 2039 over the remaining life of the related property and the $8 million wholesale portion being amortized over 10 years (through 2034). Other regulatory assets – Comprised of numerous immaterial components with remaining amortization periods at December 31, 2024 generally not exceeding 19 years for Alabama Power, 10 years for Georgia Power, 10 years for Mississippi Power, and 15 years for Southern Company Gas. Reliability reserves and storm/property damage reserves – Utilized as related expenses are incurred. See "Alabama Power – Rate NDR" and " – Reliability Reserve Accounting Order," "Georgia Power – Storm Damage Recovery," and "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Nuclear fuel disposal cost recovery – Represents award resulting from litigation related to nuclear fuel disposal costs. See Note 3 under "Nuclear Fuel Disposal Costs" for additional information. Other regulatory liabilities – Comprised of numerous immaterial components with remaining amortization periods at December 31, 2024 generally not exceeding one year for Alabama Power, three years for Georgia Power, one year for Mississippi Power, and 20 years for Southern Company Gas. Alabama Power Alabama Power's revenues from regulated retail operations are collected through various rate mechanisms subject to the oversight of the Alabama PSC. Alabama Power currently recovers its costs from the regulated retail business primarily through Rate RSE, Rate CNP, Rate ECR, and Rate NDR. In addition, the Alabama PSC issues accounting orders to address current events impacting Alabama Power. Petition for Certificate of Convenience and Necessity On October 24, 2024, Alabama Power entered into an agreement to acquire all of the equity interests in Tenaska Alabama Partners, L.P. for a total purchase price of approximately $622 million, subject to working capital adjustments. Tenaska Alabama Partners, L.P. owns and operates the Lindsay Hill Generating Station, an approximately 855-MW combined cycle generation facility in Autauga County, Alabama. On October 30, 2024, Alabama Power filed a petition for a CCN with the Alabama PSC for authorization to procure additional generating capacity through the acquisition of the Lindsay Hill Generating Station. As part of the acquisition, Alabama Power will assume an existing power sales agreement under which the full output of the generating facility remains committed to a third party through April 2027. Upon expiration of the power sales agreement, Alabama Power expects to recover costs associated with the Lindsay Hill Generating Station acquisition through Rate CNP New Plant, Rate CNP Compliance, Rate ECR, and Rate RSE. The completion of the acquisition is subject to the satisfaction or waiver of certain conditions, including, among other customary closing conditions, approval by the Alabama PSC and the FERC, as well as the expiration or termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act. Alabama Power expects to complete the acquisition by the end of the third quarter 2025. The ultimate outcome of this matter cannot be determined at this time. Renewable Generation Certificate Through the issuance of a Renewable Generation Certificate (RGC), Alabama Power is authorized by the Alabama PSC to procure renewable capacity and energy and to market the related energy and environmental attributes to customers and other third parties. Under the original RGC, Alabama was authorized to procure up to 500 MWs of renewable capacity and energy. In June 2023, the Alabama PSC issued an order approving modifications to Alabama Power's RGC. The modifications authorized Alabama Power to procure an additional 2,400 MWs of renewable capacity and energy by June 14, 2029 and to market the related energy and environmental attributes to customers and other third parties. The modifications also increased the size of allowable renewable projects from 80 MWs to 200 MWs and increased the annual approval limit from 160 MWs to 400 MWs. Through December 31, 2024, Alabama Power has procured solar capacity totaling approximately 498 MWs under the RGC. Rate RSE The Alabama PSC has adopted Rate RSE that provides for periodic annual adjustments based upon Alabama Power's projected weighted common equity return (WCER) compared to an allowable range. Rate RSE adjustments are based on forward-looking information for the applicable upcoming calendar year. Rate RSE adjustments for any two-year period, when averaged together, cannot exceed 4.0% and any annual adjustment is limited to 5.0%. When the projected WCER is under the allowed range, there is an adjusting point of 5.98% and eligibility for a performance-based adder of seven basis points, or 0.07%, to the WCER adjusting point if Alabama Power (i) has an "A" credit rating equivalent with at least one of the recognized rating agencies or (ii) is in the top one-third of a designated customer value benchmark survey. Alabama Power continues to reduce growth in total debt by increasing equity, with corresponding reductions in debt issuances, thereby de-leveraging its capital structure. Alabama Power's goal is to achieve an equity ratio of approximately 55% by the end of 2025. At December 31, 2024 and 2023, Alabama Power's equity ratio was approximately 53.9% and 52.3%, respectively. Generally, during a year without a Rate RSE upward adjustment, if Alabama Power's actual WCER is between 6.15% and 7.65%, customers will receive 25% of the amount between 6.15% and 6.65%, 40% of the amount between 6.65% and 7.15%, and 75% of the amount between 7.15% and 7.65%. Customers will receive all amounts in excess of an actual WCER of 7.65%. During a year with a Rate RSE upward adjustment, if Alabama Power's actual WCER exceeds 6.15%, customers receive 50% of the amount between 6.15% and 6.90% and all amounts in excess of an actual WCER of 6.90%. Alabama Power's ability to retain a portion of the revenue that causes the actual WCER for a given year to exceed the allowed range positions Alabama Power to address the pressure on its credit quality, without increasing retail rates under Rate RSE in the near term. There is no provision for additional customer billings should the actual retail return fall below the WCER range. Retail rates under Rate RSE did not change for 2023 or 2024. For the years ended December 31, 2022, 2023, and 2024, Alabama Power's WCER exceeded 6.15%, resulting in Alabama Power establishing a current regulatory liability of $62 million, $15 million, and $12 million, respectively, for Rate RSE refunds. In accordance with an Alabama PSC order issued in February 2023, Alabama Power refunded the 2022 amount to customers through bill credits in August 2023. The $15 million regulatory liability at December 31, 2023 was refunded to customers through bill credits in April 2024. The $12 million regulatory liability at December 31, 2024 will be refunded to customers through bill credits in May 2025. On November 27, 2024, Alabama Power made its required annual Rate RSE submission to the Alabama PSC of projected data for calendar year 2025, resulting in an increase of 4.87%, or $325 million annually, that became effective for the billing month of January 2025. Excess Accumulated Deferred Income Tax Accounting Order In 2022, the Alabama PSC directed Alabama Power to accelerate the amortization of a regulatory liability associated with excess federal accumulated deferred income taxes. Under this order, in 2023, approximately $304 million was returned to customers through bill credits to offset the impact of the rate increase discussed under "Rate CNP Depreciation" herein. In October 2023, the Alabama PSC issued an order modifying its 2022 order and authorizing Alabama Power to (i) flow back in 2023 approximately $24 million of certain federal excess accumulated deferred income taxes resulting from the Tax Reform Legislation and (ii) make available any remaining balance of excess accumulated deferred income taxes at the end of 2023 for the benefit of customers in 2024 and/or 2025. At December 31, 2023, the remaining balance was $81 million, of which approximately $67 million was flowed back in 2024 and $14 million will flow back in 2025 for the benefit of customers. Rate CNP New Plant Rate CNP New Plant allows for recovery of Alabama Power's retail costs associated with newly developed or acquired certificated generating facilities placed into retail service. In July 2022, the Alabama PSC approved a CCN authorizing Alabama Power to complete the acquisition of the Calhoun Generating Station. The transaction closed in September 2022, and, in October 2022, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover the related costs. The filing reflected an increase in annual revenues of $34 million, or 0.6%, effective with November 2022 billings. In 2020, the Alabama PSC approved a CCN authorizing Alabama Power to complete the acquisition of the Central Alabama Generating Station, which occurred in August 2020. Through May 2023, Alabama Power recovered substantially all costs associated with the Central Alabama Generating Station through Rate RSE, offset by revenues from a power sales agreement. Beginning in July 2022, fuel costs associated with Central Alabama Generating Station are being recovered through Rate ECR. In March 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover costs associated with the acquisition of the Central Alabama Generating Station. The filing reflected an annual increase in retail revenues of $78 million, or 1.1%, effective with June 2023 billings. On May 24, 2023, the Central Alabama Generating Station was placed into retail service. The Alabama PSC's 2020 CCN also authorized Alabama Power to construct an approximately 720-MW combined cycle facility at Alabama Power's Plant Barry (Plant Barry Unit 8) and the recovery of estimated in-service costs. On November 1, 2023, the unit was placed in service. In December 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover the related costs. The filing reflected an annual increase in retail revenues of $91 million, or 1.4%, effective with January 2024 billings. Rate CNP PPA Rate CNP PPA allows for the recovery of Alabama Power's retail costs associated with certificated PPAs. Revenues for Rate CNP PPA, as recorded on the financial statements, are adjusted for differences in actual recoverable costs and amounts billed in current regulated rates. Accordingly, changes in the billing factors will have no significant effect on Southern Company's or Alabama Power's revenues or net income but will affect annual cash flow. No adjustments to Rate CNP PPA occurred during the period 2022 through 2024 and no adjustment is expected for 2025. At December 31, 2024 and 2023, Alabama Power had an under recovered Rate CNP PPA balance of $84 million and $103 million, respectively, of which $17 million and $18 million, respectively, is included in other regulatory assets, current and $67 million and $85 million, respectively, is included in other regulatory assets, deferred on Southern Company's and Alabama Power's balance sheets. Rate CNP Compliance Rate CNP Compliance allows for the recovery of Alabama Power's retail costs associated with laws, regulations, and other such mandates directed at the utility industry involving the environment, security, reliability, safety, sustainability, or similar considerations impacting Alabama Power's facilities or operations. Rate CNP Compliance is based on forward-looking information and provides for the recovery of these costs pursuant to factors that are calculated and submitted to the Alabama PSC by December 1 with rates effective for the following calendar year. Compliance costs to be recovered include operations and maintenance expenses, depreciation, and a return on certain invested capital. Revenues for Rate CNP Compliance, as recorded on the financial statements, are adjusted for differences in actual recoverable costs and amounts billed in current regulated rates. Accordingly, changes in the billing factors will have no significant effect on Southern Company's or Alabama Power's revenues or net income, but will affect annual cash flow. Changes in Rate CNP Compliance-related operations and maintenance expenses and depreciation generally will have no effect on net income. In December 2022, December 2023, and November 2024, Alabama Power submitted calculations to the Alabama PSC associated with its cost of complying with governmental mandates for the following calendar year, as provided under Rate CNP Compliance. The 2022 filing reflected a $255 million, or 3.7%, annual increase effective with January 2023 billings, primarily due to updated depreciation rates. The 2023 filing reflected a $23 million, or 0.3%, annual decrease effective with January 2024 billings. The 2024 filing reflected a projected under recovered retail revenue requirement of $50 million. On December 3, 2024, the Alabama PSC issued a consent order requiring Alabama Power to leave the 2024 Rate CNP Compliance factors in effect for 2025, with any prior year under collected amount deemed recovered before any current year amounts are recovered, and any remaining under recovered amounts reflected in the 2025 filing. At December 31, 2024, Alabama Power had an under recovered Rate CNP Compliance balance of $35 million which is included in other regulatory assets, deferred on Southern Company's and Alabama Power's balance sheets. At December 31, 2023, Alabama Power had an under recovered Rate CNP Compliance balance of $33 million, of which $8 million is included in other regulatory assets, current and $25 million is included in other regulatory assets, deferred on Southern Company's and Alabama Power's balance sheets. Rate CNP Depreciation In 2022, the Alabama PSC approved Rate CNP Depreciation, which allows Alabama Power to recover changes in depreciation resulting from updates to certain depreciation rates, excluding any depreciation recovered through Rate CNP New Plant, Rate CNP Compliance, or costs associated with the capitalization of asset retirement costs. Rate CNP Depreciation resulted in an annual revenue increase of approximately $318 million, or 4.6%, effective with January 2023 billings. No adjustments to Rate CNP Depreciation occurred during 2024 and no adjustment is expected for 2025. Rate ECR Rate ECR recovers Alabama Power's retail energy costs based on an estimate of future energy costs and the current over or under recovered balance. Revenues recognized under Rate ECR and recorded on the financial statements are adjusted for the difference in actual recoverable fuel costs and amounts billed in current regulated rates. The difference in the recoverable fuel costs and amounts billed gives rise to the over or under recovered amounts recorded as regulatory assets or liabilities. Alabama Power, along with the Alabama PSC, continually monitors the over or under recovered cost balance to determine whether an adjustment to billing rates is required. Changes in the Rate ECR factor have no significant effect on Southern Company's or Alabama Power's net income but will impact the related operating cash flows. The Alabama PSC may approve billing rates under Rate ECR of up to 5.910 cents per KWH. The Alabama PSC approved adjustments to Rate ECR from 1.960 cents per KWH to 2.557 cents per KWH, or approximately $310 million annually, effective with August 2022 billings and from 2.557 cents per KWH to 3.510 cents per KWH, or approximately $500 million annually, effective with December 2022 billings. In November 2023, the Alabama PSC approved a decrease to Rate ECR from 3.510 cents per KWH to 3.270 cents per KWH, or approximately $126 million annually, effective with December 2023 billings. On May 7, 2024, the Alabama PSC approved a decrease to Rate ECR from 3.270 cents per KWH to 3.015 cents per KWH, or approximately $135 million annually, effective with July 2024 billings. On December 3, 2024, the Alabama PSC approved an additional reduction to Rate ECR from 3.015 cents per KWH to 2.600 cents per KWH, or $218 million annually, effective with January 2025 billings. The rate will adjust to 5.910 cents per KWH in January 2026 absent a further order from the Alabama PSC. At December 31, 2024, Alabama Power's over recovered fuel costs totaled $29 million and is included in other regulatory liabilities, current on Southern Company's and Alabama Power's balance sheets. At December 31, 2023, Alabama Power's under recovered fuel costs totaled $246 million and is included in regulatory assets – under recovered retail fuel clause revenues on Southern Company's and Alabama Power's balance sheets. These classifications are based on estimates, which include such factors as weather, generation availability, energy demand, and the price of energy. A change in any of these factors could have a significant impact on the timing of any recovery or return of fuel costs. Plant Greene County Alabama Power jointly owns Plant Greene County Units 1 and 2 with an affiliate, Mississippi Power. See Note 5 under "Joint Ownership Agreements" for additional information. Mississippi Power's 2024 IRP includes a schedule to retire Mississippi Power's 40% ownership interest in Plant Greene County Units 1 and 2 by the end of 2028. Alabama Power currently expects to retire Plant Greene County Units 1 and 2 (300 MWs based on 60% ownership) by the end of 2028. Alabama Power and Mississippi Power have continued to evaluate operating conditions and business needs relevant to the anticipated retirement of Plant Greene County Units 1 and 2. The ultimate outcome of this matter cannot be determined at this time. See "Mississippi Power – Integrated Resource Plans" herein for additional information. Rate NDR Based on an order from the Alabama PSC, Alabama Power maintains a reserve for operations and maintenance expenses to cover the cost of damages from major storms to its transmission and distribution facilities. The order approves a separate monthly Rate NDR charge to customers consisting of two components. The first component is intended to establish and maintain a reserve balance for future storms and is an on-going part of customer billing. When the reserve balance falls below $50 million, a reserve establishment charge will be activated (and the on-going reserve maintenance charge concurrently suspended) until the reserve balance reaches $75 million. The second component of the Rate NDR charge is intended to allow recovery of any existing deferred storm-related operations and maintenance costs and any future reserve deficits over a 48-month period (24-month period prior to modifications approved by the Alabama PSC in 2022). The Alabama PSC order gives Alabama Power authority to record a deficit balance in the NDR when costs of storm damage exceed any established reserve balance. The maximum total Rate NDR charge was limited to $10.00 per month per non-residential customer account and $5.00 per month per residential customer account through July 12, 2022. Subsequently, modifications approved by the Alabama PSC replaced the maximum total Rate NDR charge with a maximum charge to recover a deficit of $5.00 per month per non-residential customer account and $2.50 per month per residential customer account. Alabama Power has the authority, based on an order from the Alabama PSC, to accrue certain additional amounts as circumstances warrant, which can be used to offset storm charges. Alabama Power made an additional accrual of $21 million in 2024. Alabama Power collected approximately $12 million, $12 million, and $14 million in 2024, 2023, and 2022, respectively, u

CONTINGENCIES, COMMITMENTS, AND

CONTINGENCIES, COMMITMENTS, AND GUARANTEES	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
CONTINGENCIES, COMMITMENTS, AND GUARANTEES	CONTINGENCIES, COMMITMENTS, AND GUARANTEES General Litigation Matters The Registrants are involved in various matters being litigated and regulatory matters. The ultimate outcome of such pending or potential litigation or regulatory matters against each Registrant and any subsidiaries cannot be determined at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on such Registrant's financial statements. The Registrants intend to dispute the allegations raised in and vigorously defend against the pending legal challenges discussed below; however, the ultimate outcome of each of these matters cannot be determined at this time. Southern Company and Mississippi Power In 2010, the DOE, through a cooperative agreement with SCS, agreed to fund $270 million of the Kemper County energy facility through the grants awarded to the project by the DOE under the Clean Coal Power Initiative Round 2. In 2016, additional DOE grants in the amount of $137 million were awarded to the Kemper County energy facility. In 2018, Mississippi Power filed with the DOE its request for property closeout certification under the contract related to the $387 million of total grants received. In 2020, Mississippi Power and Southern Company executed an agreement with the DOE completing Mississippi Power's request, which enabled Mississippi Power to proceed with full dismantlement of the abandoned gasifier-related assets and site restoration activities. In connection with the DOE closeout discussions, in 2019, the Civil Division of the Department of Justice informed Southern Company and Mississippi Power of a civil investigation related to the DOE grants. In August 2023, the U.S. District Court for the Northern District of Georgia unsealed a civil action in which defendants Southern Company, SCS, and Mississippi Power are alleged to have violated certain provisions of the False Claims Act by fraudulently inducing the DOE to disburse funds pursuant to the grants. The federal government declined to intervene in the action. In October 2023, the plaintiff, a former SCS employee, filed an amended complaint, again alleging certain violations of the False Claims Act. The plaintiff seeks to recover all damages incurred personally and on behalf of the federal government caused by the defendants' alleged violations, as well as treble damages and attorneys' fees, among other relief. On February 2, 2024, the defendants moved to dismiss the amended complaint. On August 28, 2024, the court granted the defendants' motion in part and denied it in part, dismissing the plaintiff's False Claims Act count along with its accompanying treble damages and attorneys' fees but allowing the employment retaliation claim to proceed. The plaintiff requested interlocutory appeal of the court's decision on October 4, 2024. On October 14, 2024, the defendants asserted counterclaims for conversion and misappropriation of trade secrets. On November 20, 2024, the defendants filed a motion for judgment on the pleadings on the plaintiff's employment retaliation claim. On December 23, 2024, the plaintiff filed a motion to dismiss the defendants' counterclaims. An adverse outcome could have a material impact on Southern Company's and Mississippi Power's financial statements. Alabama Power In September 2022, Mobile Baykeeper filed a citizen suit in the U.S. District Court for the Southern District of Alabama alleging that Alabama Power's plan to close the Plant Barry surface impoundment utilizing a closure-in-place methodology violates the Resource Conservation and Recovery Act (RCRA) and regulations governing CCR. Among other relief requested, Mobile Baykeeper sought a declaratory judgment that the RCRA and regulations governing CCR were being violated, preliminary and injunctive relief to prevent implementation of Alabama Power's closure plan, and the development of a closure plan that satisfies regulations governing CCR requirements. In December 2022, Alabama Power filed a motion to dismiss the case. On January 4, 2024, the lawsuit was dismissed without prejudice by the U.S. District Court judge. On February 1, 2024, the plaintiff filed a motion to reconsider, which was denied by the U.S. District Court judge on July 22, 2024. On August 20, 2024, the plaintiff filed a notice of appeal in the U.S. Court of Appeals for the Eleventh Circuit challenging the denial of the motion to reconsider the order of dismissal. In January 2023, the EPA issued a Notice of Potential Violations (NOPV) associated with Alabama Power's plan to close the Plant Barry surface impoundment. On September 26, 2024, Alabama Power reached a settlement with the EPA resolving two of the three allegations in the NOPV related to the groundwater monitoring system and the emergency action plan at the Plant Barry surface impoundment. The settlement did not resolve the EPA's allegation relating to Alabama Power's plan to close the Plant Barry surface impoundment. Alabama Power has affirmed to the EPA its position that it is in compliance with CCR requirements. These matters could have a material impact on Alabama Power's and Southern Company's financial statements, including ARO estimates and cash flows. See Note 6 for a discussion of Alabama Power's ARO liabilities. Georgia Power In July 2020, a group of individual plaintiffs filed a complaint, which was amended in December 2022, in the Superior Court of Fulton County, Georgia against Georgia Power alleging that the construction and operation of Plant Scherer has impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs sought an unspecified amount of monetary damages including punitive damages, a medical monitoring fund, and injunctive relief. In December 2022, the Superior Court of Fulton County, Georgia granted Georgia Power's motion to transfer the case to the Superior Court of Monroe County, Georgia. In May 2023, the Superior Court of Monroe County, Georgia denied Georgia Power's motion to dismiss the case for lack of subject matter jurisdiction. In July 2023, the Superior Court of Monroe County, Georgia denied the remaining motions to dismiss certain claims and plaintiffs that Georgia Power filed at the outset of the case. On March 11, 2024, Georgia Power filed a motion to dismiss certain claims. On March 14, 2024, Georgia Power filed motions for summary judgment. In May 2024, Georgia Power filed additional motions for summary judgment. In August 2024, the court denied certain motions for summary judgment, while granting other motions for summary judgment, eliminating some claims from the first one-plaintiff trial. In October 2021, February 2022, and January 2023, a total of eight additional complaints were filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that releases from Plant Scherer have impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs sought an unspecified amount of monetary damages including punitive damages. After Georgia Power removed these cases to the U.S. District Court for the Middle District of Georgia, the plaintiffs voluntarily dismissed their complaints without prejudice in November 2022 and January 2023. In May 2023, the plaintiffs in the cases originally filed in October 2021, February 2022, and January 2023 refiled their eight complaints in the Superior Court of Monroe County, Georgia. Also in May 2023, a new complaint was filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that the construction and operation of Plant Scherer have impacted groundwater and air, resulting in alleged personal injuries. The plaintiff sought an unspecified amount of monetary damages, including punitive damages. Also in May 2023, Georgia Power removed all of these cases to the U.S. District Court for the Middle District of Georgia. The plaintiffs requested the court remand the cases back to the Superior Court of Monroe County, Georgia. On November 18, 2024, the parties reached an agreement to resolve all pending lawsuits in the Superior Court of Fulton County, Georgia and the Superior Court of Monroe County, Georgia. On November 22, 2024, the Superior Court of Monroe County, Georgia entered an order granting Georgia Power's motions for summary judgment, finding there is no evidence that Georgia Power's operations negatively impacted drinking water wells or caused personal injury or property damage. On November 25, 2024, the plaintiffs voluntarily dismissed with prejudice all remaining claims in the litigation. The settlement amount did not have a material impact on Georgia Power's financial statements. These matters are now concluded. Environmental Remediation The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and the natural gas distribution utilities conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in the financial statements. A liability for environmental remediation costs is recognized only when a loss is determined to be probable and reasonably estimable and is reduced as expenditures are incurred. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia have each received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental remediation costs through regulatory mechanisms. Any difference between the liabilities accrued and costs recovered through rates is deferred as a regulatory asset or liability. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the state PSCs or other applicable state regulatory agencies. Georgia Power has been designated or identified as a potentially responsible party at sites governed by the Georgia Hazardous Site Response Act and/or by the federal Comprehensive Environmental Response, Compensation, and Liability Act, and assessment and potential cleanup of such sites is expected. For 2024, 2023, and 2022, Georgia Power recovered approximately $5 million, $5 million, and $12 million, respectively, through the ECCR tariff for environmental remediation. Southern Company Gas is subject to environmental remediation liabilities associated with former manufactured gas plant sites. Southern Company Gas' accrued environmental remediation liability at December 31, 2024 and 2023 was based on the estimated cost of environmental investigation and remediation associated with these sites. At December 31, 2024 and 2023, the environmental remediation liability and the balance of under recovered environmental remediation costs were reflected in the balance sheets of Southern Company, Georgia Power, and Southern Company Gas as shown in the table below. Alabama Power and Mississippi Power did not have environmental remediation liabilities at December 31, 2024 or 2023. Southern Company Georgia Southern Company Gas (in millions) December 31, 2024: Environmental remediation liability: Other current liabilities $ 37 $ 13 $ 24 Accrued environmental remediation 198 — 198 Under recovered environmental remediation costs: Other regulatory assets, current $ 37 $ 5 $ 32 Other regulatory assets, deferred 212 11 201 December 31, 2023: Environmental remediation liability: Other current liabilities $ 44 $ 14 $ 30 Accrued environmental remediation 192 — 192 Under recovered environmental remediation costs: Other regulatory assets, current $ 45 $ 5 $ 40 Other regulatory assets, deferred 210 15 195 The ultimate outcome of these matters cannot be determined at this time; however, as a result of the regulatory treatment for environmental remediation expenses described above, the final disposition of these matters is not expected to have a material impact on the financial statements of the applicable Registrants. Nuclear Fuel Disposal Costs Acting through the DOE and pursuant to the Nuclear Waste Policy Act of 1982, the U.S. government entered into contracts with Alabama Power and Georgia Power that required the DOE to take title to and dispose of spent nuclear fuel generated at Plants Farley, Hatch, and Vogtle Units 1 and 2 beginning no later than January 31, 1998. The DOE has yet to commence performance of its contractual and statutory obligation to dispose of spent nuclear fuel. Consequently, Alabama Power and Georgia Power pursued and continue to pursue legal remedies against the U.S. government for its partial breach of contract. In 2014, Alabama Power and Georgia Power filed their third round of lawsuits against the U.S. government in the Court of Federal Claims, seeking damages for the costs of continuing to store spent nuclear fuel at Plants Farley, Hatch, and Vogtle Units 1 and 2 for the period from January 1, 2011 through December 31, 2013. The damage period was subsequently extended to December 31, 2014. In 2019, the Court of Federal Claims granted Alabama Power's and Georgia Power's motion for summary judgment on damages not disputed by the U.S. government, awarding those undisputed damages to Alabama Power and Georgia Power. In 2017, Alabama Power and Georgia Power filed their fourth round of lawsuits against the U.S. government in the Court of Federal Claims, seeking damages for the costs of continuing to store spent nuclear fuel at Plants Farley, Hatch, and Vogtle Units 1 and 2 for the period from January 1, 2015 through December 31, 2017. In 2020, Alabama Power and Georgia Power filed amended complaints in those fourth-round lawsuits adding damages incurred from January 1, 2018 to December 31, 2019 to the claim period. On June 7, 2024, and August 15, 2024, the Court of Federal Claims entered final judgments on the remaining damages in the third and fourth round of lawsuits, respectively, awarding Alabama Power a total of approximately $100 million and Georgia Power a total of approximately $121 million (based on its ownership interests), which represent claims for the period from January 1, 2011 through December 31, 2019. This represents recovery on all claims that Alabama Power and Georgia Power have filed against the U.S. government to date. On December 3, 2024, the Alabama PSC directed Alabama Power to return the award, which was reflected as a regulatory liability at December 31, 2024, to customers through bill credits during the months of January, February, and March 2025. During the third quarter 2024, Georgia Power credited the award to accounts where the original costs were charged, which reduced rate base, fuel, and cost of service for the benefit of customers, as previously authorized by the Georgia PSC. As a result of this regulatory treatment, there will be no material impact on Southern Company's, Alabama Power's, or Georgia Power's net income. Damages will continue to accumulate until the issue is resolved, the U.S. government disposes of Alabama Power's and Georgia Power's spent nuclear fuel pursuant to its contractual obligations, or alternative storage is otherwise provided. However, Alabama Power and Georgia Power expect to credit any future recoveries for the benefit of customers in accordance with direction from their respective PSC; therefore, no material impact on Southern Company's, Alabama Power's, or Georgia Power's net income is expected. On-site dry spent fuel storage facilities are operational at all three plants and can be expanded to accommodate spent fuel through the expected life of each plant. Nuclear Insurance Under the Price-Anderson Amendments Act (Act), Alabama Power and Georgia Power maintain agreements of indemnity with the NRC that, together with private insurance, cover third-party liability arising from any nuclear incident occurring at the companies' nuclear power plants. The Act provides funds up to $16.3 billion for public liability claims that could arise from a single nuclear incident. Each nuclear plant is insured against this liability to a maximum of $500 million by American Nuclear Insurers (ANI), with the remaining coverage provided by a mandatory program of deferred premiums that could be assessed, after a nuclear incident, against all owners of commercial nuclear reactors. A company could be assessed up to $166 million per incident for each licensed reactor it operates but not more than an aggregate of $25 million per incident to be paid in a calendar year for each reactor. Such maximum assessment, excluding any applicable state premium taxes, for Alabama Power and Georgia Power, based on its ownership and buyback interests in all licensed reactors, is $332 million and $473 million, respectively, per incident, but not more than an aggregate of $49 million and $71 million, respectively, to be paid for each incident in any one year. Both the maximum assessment per reactor and the maximum yearly assessment are adjusted for inflation at least every five years. The next scheduled adjustment is due no later than November 1, 2028. See Note 5 under "Joint Ownership Agreements" for additional information on joint ownership agreements. Alabama Power and Georgia Power are members of Nuclear Electric Insurance Limited (NEIL), a mutual insurer established to provide property damage insurance in an amount up to $1.5 billion for members' operating nuclear generating facilities. Additionally, both companies have NEIL policies that currently provide decontamination, excess property insurance, and premature decommissioning coverage up to $1.25 billion for nuclear losses and policies providing coverage up to $750 million for non-nuclear losses in excess of the $1.5 billion primary coverage. NEIL also covers the additional costs that would be incurred in obtaining replacement power during a prolonged accidental outage at a member's nuclear plant. Members can purchase this coverage, subject to a deductible waiting period of up to 26 weeks, with a maximum per occurrence per unit limit of $490 million. After the deductible period, weekly indemnity payments would be received until either the unit is operational or until the limit is exhausted. Alabama Power and Georgia Power each purchase limits based on the projected full cost of replacement power, subject to ownership limitations, and have each elected a 12-week deductible waiting period for each nuclear plant. Under each of the NEIL policies, members are subject to assessments each year if losses exceed the accumulated funds available to the insurer. The maximum annual assessments for Alabama Power and Georgia Power as of December 31, 2024 under the NEIL policies would be $60 million and $80 million, respectively. Claims resulting from terrorist acts and cyber events are covered under both the ANI and NEIL policies (subject to normal policy limits). The maximum aggregate that NEIL will pay for all claims resulting from terrorist acts and cyber events in any 12-month period is $3.2 billion each, plus such additional amounts NEIL can recover through reinsurance, indemnity, or other sources. For all on-site property damage insurance policies for commercial nuclear power plants, the NRC requires that the proceeds of such policies shall be dedicated first for the sole purpose of placing the reactor in a safe and stable condition after an accident. Any remaining proceeds are to be applied next toward the costs of decontamination and debris removal operations ordered by the NRC, and any further remaining proceeds are to be paid either to the applicable company or to its debt trustees as may be appropriate under the policies and applicable trust indentures. In the event of a loss, the amount of insurance available might not be adequate to cover property damage and other expenses incurred. Uninsured losses and other expenses, to the extent not recovered from customers, would be borne by Alabama Power or Georgia Power, as applicable, and could have a material effect on Southern Company's, Alabama Power's, and Georgia Power's financial condition, cash flows, and results of operations. Other Matters Alabama Power In April 2019, Bellsouth Telecommunications d/b/a AT&T Alabama (AT&T) filed a complaint against Alabama Power with the FCC alleging that the pole rental rate AT&T is required to pay pursuant to the parties' joint use agreement is unjust and unreasonable under federal law. The complaint sought a new rate and refunds of alleged overpayments since 2013. In August 2019, the FCC stayed the case in favor of arbitration, which AT&T did not pursue. On December 31, 2024, Alabama Power and AT&T reached a settlement that resolved several disputes between the parties, including the outstanding FCC complaint. The terms of the settlement are not expected to have a material impact on Alabama Power's or Southern Company's financial statements. The joint use agreement remains in effect. Mississippi Power In 2022, 2023, and 2024, Mississippi Power recorded charges to income associated with abandonment and related closure costs and ongoing period costs, net of salvage proceeds, for the mine and gasifier-related assets at the Kemper County energy facility. These charges, including related tax impacts, totaled $15 million pre-tax ($12 million after tax) in 2022, $17 million pre-tax ($12 million after tax) in 2023, and $12 million pre-tax ($9 million after tax) in 2024. The pre-tax charges are included in other operations and maintenance expenses on the statements of income. Dismantlement of the abandoned gasifier-related assets and site restoration activities are expected to be completed by the end of 2025 . Additional pre-tax period costs associated with dismantlement and site restoration activities, including related costs for compliance and safety, ARO accretion, and property taxes, net of salvage, are estimated to total approximately $15 million. See "General Litigation Matters – Southern Company and Mississippi Power" herein for information regarding litigation associated with the Kemper County energy facility. Commitments To supply a portion of the fuel requirements of the Southern Company system's electric generating plants, the Southern Company system has entered into various long-term commitments not recognized on the balance sheets for the procurement and delivery of fossil fuel and, for Alabama Power and Georgia Power, nuclear fuel. The majority of the Registrants' fuel expense for the periods presented was purchased under long-term commitments. Each Registrant expects that a substantial amount of its future fuel needs will continue to be purchased under long-term commitments. Georgia Power has commitments, in the form of capacity purchases, regarding a portion of a 5% interest in the original cost of Plant Vogtle Units 1 and 2 owned by MEAG Power that are in effect until the later of the retirement of the plant or the latest stated maturity date of MEAG Power's bonds issued to finance such ownership interest. The payments for capacity are required whether or not any capacity is available. Portions of the capacity payments made to MEAG Power for its Plant Vogtle Units 1 and 2 investment relate to costs in excess of Georgia Power's allowed investment for ratemaking purposes. The present value of these portions at the time of the disallowance was written off. Generally, the cost of such capacity is included in purchased power in Southern Company's statements of income and in purchased power, non-affiliates in Georgia Power's statements of income. Georgia Power's capacity payments related to this commitment totaled $4 million, $3 million, and $4 million in 2024, 2023, and 2022, respectively. At December 31, 2024, Georgia Power's estimated long-term obligations related to this commitment totaled $35 million, consisting of $3 million for 2025, $2 million annually for 2026 through 2029, and $24 million thereafter. See Note 9 for information regarding PPAs accounted for as leases. Guarantees SCS may enter into various types of wholesale energy and natural gas contracts acting as an agent for the traditional electric operating companies and Southern Power. Under these agreements, each of the traditional electric operating companies and Southern Power may be jointly and severally liable. Accordingly, Southern Company has entered into keep-well agreements with each of the traditional electric operating companies to ensure they will not subsidize or be responsible for any costs, losses, liabilities, or damages resulting from the inclusion of Southern Power as a contracting party under these agreements. Alabama Power has guaranteed a $100 million principal amount long-term bank loan SEGCO entered into in 2018 and subsequently extended and amended. Georgia Power has agreed to reimburse Alabama Power for the portion of such obligation corresponding to Georgia Power's proportionate ownership of SEGCO's stock if Alabama Power is called upon to make such payment under its guarantee. At December 31, 2024, the capitalization of SEGCO consisted of $56 million of equity and $80 million of long-term debt that matures in November 2025, on which the annual interest requirement is derived from a variable rate index. SEGCO had no short-term debt outstanding at December 31, 2024. See Note 7 under "SEGCO" for additional information. As discussed in Note 9, Alabama Power and Georgia Power have entered into certain residual value guarantees related to railcar leases, with Georgia Power's railcar leases terminating in June 2024.

REVENUE FROM CONTRACTS WITH CUS

REVENUE FROM CONTRACTS WITH CUSTOMERS	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
REVENUE FROM CONTRACTS WITH CUSTOMERS	REVENUE FROM CONTRACTS WITH CUSTOMERS The Registrants generate revenues from a variety of sources, some of which are not accounted for as revenue from contracts with customers, such as leases, derivatives, and certain cost recovery mechanisms. Included in the wholesale electric revenues of the traditional electric operating companies and Southern Power are revenues associated with affiliate transactions. These revenues are generated through long-term PPAs or short-term energy sales made in accordance with the IIC, as approved by the FERC. Amounts related to these affiliate revenues are eliminated in consolidation for Southern Company. See Note 1 under "Affiliate Transactions" and "Revenues" for additional information. See Notes 9 and 14 for additional information on revenue accounted for under lease and derivative accounting guidance, respectively. The following table disaggregates revenue from contracts with customers for the periods presented: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) 2024 Operating revenues Retail electric revenues Residential $ 8,276 $ 3,133 $ 4,835 $ 308 $ — $ — Commercial 6,585 2,042 4,219 324 — — Industrial 3,892 1,742 1,808 342 — — Other 124 13 102 9 — — Total retail electric revenues 18,877 6,930 10,964 983 — — Natural gas distribution revenues Residential 1,753 — — — — 1,753 Commercial 417 — — — — 417 Transportation 1,295 — — — — 1,295 Industrial 34 — — — — 34 Other 316 — — — — 316 Total natural gas distribution revenues 3,815 — — — — 3,815 Wholesale electric revenues PPA energy revenues 1,059 206 94 4 778 — PPA capacity revenues 641 108 136 63 400 — Non-PPA revenues 226 139 5 375 230 — Total wholesale electric revenues 1,926 453 235 442 1,408 — Other natural gas revenues Gas marketing services 507 — — — — 507 Other 18 — — — — 18 Total other natural gas revenues 525 — — — — 525 Other revenues 1,621 240 721 52 37 — Total revenue from contracts with customers 26,764 7,623 11,920 1,477 1,445 4,340 Other revenue sources (*) (40) (69) (589) (14) 569 116 Total operating revenues $ 26,724 $ 7,554 $ 11,331 $ 1,463 $ 2,014 $ 4,456 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) 2023 Operating revenues Retail electric revenues Residential $ 7,309 $ 2,904 $ 4,105 $ 300 $ — $ — Commercial 5,860 1,928 3,624 308 — — Industrial 3,613 1,721 1,558 334 — — Other 112 12 91 9 — — Total retail electric revenues 16,894 6,565 9,378 951 — — Natural gas distribution revenues Residential 1,981 — — — — 1,981 Commercial 505 — — — — 505 Transportation 1,184 — — — — 1,184 Industrial 45 — — — — 45 Other 324 — — — — 324 Total natural gas distribution revenues 4,039 — — — — 4,039 Wholesale electric revenues PPA energy revenues 1,107 234 87 20 790 — PPA capacity revenues 624 156 51 45 376 — Non-PPA revenues 250 65 35 407 409 — Total wholesale electric revenues 1,981 455 173 472 1,575 — Other natural gas revenues Gas marketing services 528 — — — — 528 Other 31 — — — — 31 Total other natural gas revenues 559 — — — — 559 Other revenues 1,355 213 578 39 55 — Total revenue from contracts with customers 24,828 7,233 10,129 1,462 1,630 4,598 Other revenue sources (*) 425 (183) (11) 12 559 104 Total operating revenues $ 25,253 $ 7,050 $ 10,118 $ 1,474 $ 2,189 $ 4,702 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) 2022 Operating revenues Retail electric revenues Residential $ 6,604 $ 2,638 $ 3,664 $ 302 $ — $ — Commercial 5,369 1,685 3,385 299 — — Industrial 3,764 1,507 1,921 336 — — Other 102 14 79 9 — — Total retail electric revenues 15,839 5,844 9,049 946 — — Natural gas distribution revenues Residential 2,843 — — — — 2,843 Commercial 763 — — — — 763 Transportation 1,186 — — — — 1,186 Industrial 84 — — — — 84 Other 342 — — — — 342 Total natural gas distribution revenues 5,218 — — — — 5,218 Wholesale electric revenues PPA energy revenues 2,274 489 130 16 1,673 — PPA capacity revenues 596 194 47 4 356 — Non-PPA revenues 250 200 30 690 740 — Total wholesale electric revenues 3,120 883 207 710 2,769 — Other natural gas revenues Gas marketing services 636 — — — — 636 Other 51 — — — — 51 Total other natural gas revenues 687 — — — — 687 Other revenues 1,077 194 446 47 36 — Total revenue from contracts with customers 25,941 6,921 9,702 1,703 2,805 5,905 Other revenue sources (*) 3,338 896 1,882 (9) 564 57 Total operating revenues $ 29,279 $ 7,817 $ 11,584 $ 1,694 $ 3,369 $ 5,962 (*) Other revenue sources relate to revenues from customers accounted for as derivatives and leases, alternative revenue programs at Southern Company Gas, and cost recovery mechanisms and revenues (including those related to fuel costs ) that meet other scope exceptions for revenues from contracts with customers at the traditional electric operating companies. Contract Balances The following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers at December 31, 2024 and 2023: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Accounts Receivable At December 31, 2024 $ 3,048 $ 783 $ 1,244 $ 113 $ 106 $ 660 At December 31, 2023 2,820 821 1,011 90 122 684 Contract Assets At December 31, 2024 $ 323 $ 3 $ 184 $ — $ — $ 72 At December 31, 2023 271 2 121 — — 56 Contract Liabilities At December 31, 2024 $ 140 $ 11 $ 34 $ — $ 2 $ 3 At December 31, 2023 116 — 1 — 4 — Contract assets for Georgia Power primarily relate to retail customer fixed bill programs, where the payment is contingent upon Georgia Power's continued performance and the customer's continued participation in the program over a one-year contract term, and unregulated service agreements, where payment is contingent on project completion. Contract liabilities for Georgia Power primarily relate to cash collections recognized in advance of revenue for unregulated service agreements. Southern Company Gas' contract assets relate to work performed on an energy efficiency enhancement and upgrade contract with the U.S. General Services Administration. Southern Company Gas receives cash advances from a third-party financial institution to fund work performed, of which approximately $68 million had been received at December 31, 2024. These advances have been accounted for as long-term debt on the balance sheets. See Note 1 under "Affiliate Transactions" for additional information regarding the construction contract. At December 31, 2024 and 2023, Southern Company's unregulated distributed generation business had contract assets of $67 million and $91 million, respectively, and contract liabilities of $95 million and $115 million, respectively, for outstanding performance obligations, all of which are expected to be satisfied within one year. Revenues recognized in 2024 and 2023, which were included in contract liabilities at December 31, 2023 and 2022, respectively, were $98 million and $36 million respectively, for Southern Company and immaterial for the other Registrants. Contract liabilities are primarily classified as current on the balance sheets as the corresponding revenues are generally expected to be recognized within one year. Remaining Performance Obligations Southern Company's subsidiaries may enter into long-term contracts with customers in which revenues are recognized as performance obligations are satisfied over the contract term. For the traditional electric operating companies and Southern Power, these contracts primarily relate to PPAs whereby electricity and generation capacity are provided to a customer. The revenue recognized for the delivery of electricity is variable; however, certain PPAs include a fixed payment for fixed generation capacity over the term of the contract. For Southern Company Gas, these contracts primarily relate to the U.S. General Services Administration contract described above. Southern Company's unregulated distributed generation business also has partially satisfied performance obligations related to certain fixed price contracts. Revenues from contracts with customers related to these performance obligations remaining at December 31, 2024 are expected to be recognized as follows: 2025 2026 2027 2028 2029 Thereafter (in millions) Southern Company $ 937 $ 427 $ 371 $ 343 $ 309 $ 2,636 Alabama Power 11 — — — — — Georgia Power 69 30 15 16 2 27 Mississippi Power (*) 63 66 69 73 — — Southern Power (*) 340 331 340 316 312 2,609 Southern Company Gas 2 — — — — — (*) Includes performance obligations related to affiliate PPAs with Georgia Power. See Note 1 under "Affiliate Transactions" for additional information.

PROPERTY, PLANT, AND EQUIPMENT

PROPERTY, PLANT, AND EQUIPMENT	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT, AND EQUIPMENT	PROPERTY, PLANT, AND EQUIPMENT Property, plant, and equipment is stated at original cost or fair value at acquisition, as appropriate, less any regulatory disallowances and impairments. Original cost may include: materials; labor; minor items of property; appropriate administrative and general costs; payroll-related costs such as taxes, pensions, and other benefits; and the interest capitalized and/or cost of equity funds used during construction. 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 cost of replacements of property, exclusive of minor items of property, is capitalized. The cost of maintenance, repairs, and replacement of minor items of property is charged to other operations and maintenance expenses as incurred or performed with the exception of nuclear refueling costs and certain maintenance costs including those described below. In accordance with orders from their respective state PSCs, Alabama Power and Georgia Power defer nuclear refueling outage operations and maintenance expenses to a regulatory asset when the charges are incurred. Alabama Power amortizes the costs over a subsequent 18-month period with Plant Farley's fall outage cost amortization beginning in January of the following year and spring outage cost amortization beginning in July of the same year. Georgia Power amortizes its costs over each unit's operating cycle, or 18 months for Plant Vogtle Units 1 through 4 and 24 months for Plant Hatch Units 1 and 2. Georgia Power's amortization period begins the month the refueling outage starts. The portion of Southern Company Gas' non-working gas used to maintain the structural integrity of natural gas storage facilities that is considered to be non-recoverable is depreciated, while the recoverable or retained portion is not depreciated. See Note 9 for information on finance lease right-of-use (ROU) assets, net, which are included in property, plant, and equipment. The Registrants have deferred certain implementation costs related to cloud hosting arrangements. 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 Once a hosted software is placed into service, the related deferred costs are amortized on a straight-line basis over the remaining expected hosting arrangement term, including any renewal options that are reasonably certain of exercise. The amortization is reflected with the associated cloud hosting fees, which are generally reflected in other operations and maintenance expenses on the Registrants' statements of income. 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 See Note 2 under "Regulatory Assets and Liabilities" for information on deferrals of certain other operations and maintenance costs associated with software and cloud computing projects by the traditional electric operating companies and natural gas distribution utilities, as authorized by their respective state PSCs or applicable state regulatory agencies. Depreciation and Amortization The traditional electric operating companies' and Southern Company Gas' depreciation of the original cost of utility plant in service is provided primarily by using composite straight-line rates. 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 % Depreciation studies are conducted periodically to update the composite rates. These studies are filed with the respective state PSC and/or other applicable state and federal regulatory agencies for the traditional electric operating companies and the natural gas distribution utilities. Effective January 1, 2023, Alabama Power's and Georgia Power's depreciation rates were revised. On October 25, 2024, Mississippi Power filed an updated depreciation study with the Mississippi PSC requesting an $11 million increase in total annual depreciation. On February 13, 2025, Mississippi Power entered into a stipulation with the MPUS to include certain modifications to the interim net salvage rates and increases to certain service lives. The stipulation requests an $8 million increase in total annual depreciation. The ultimate outcome of this matter cannot be determined at this time. See Note 2 for additional information. When property, plant, and equipment subject to composite depreciation is retired or otherwise disposed of in the normal course of business, its original cost, together with the cost of removal, less salvage, is charged to accumulated depreciation. For other property dispositions, the applicable cost and accumulated depreciation are removed from the balance sheet accounts, and a gain or loss is recognized. Minor items of property included in the original cost of the asset are retired when the related property unit is retired. At December 31, 2024 and 2023, accumulated depreciation for Southern Company and Southern Company Gas consisted of utility plant in service totaling $38.9 billion and $36.6 billion, respectively, for Southern Company and $5.6 billion and $5.3 billion, respectively, for Southern Company Gas, as well as other plant in service totaling $1.2 billion and $1.1 billion, respectively, for Southern Company and $252 million and $210 million, respectively, for Southern Company Gas. Other plant in service includes the non-utility assets of Southern Company Gas, as well as, for Southern Company, certain other non-utility subsidiaries. Depreciation of the original cost of other plant in service is provided primarily on a straight-line basis over estimated useful lives. Useful lives for Southern Company Gas's non-utility assets range from five five Southern Power Southern Power applies component depreciation, where depreciation is computed principally by the straight-line method over the estimated useful life of the asset. Certain of Southern Power's generation assets related to natural gas-fired facilities are depreciated on a units-of-production basis, using hours or starts, to better match outage and maintenance costs to the usage of, and revenues from, these assets. 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 When Southern Power's depreciable property, plant, and equipment is retired, or otherwise disposed of in the normal course of business, the applicable cost and accumulated depreciation is removed and a gain or loss is recognized in the statements of income. Southern Power reviews its estimated useful lives and salvage values on an ongoing basis. The results of these reviews could result in changes which could have a material impact on Southern Power's net income. Joint Ownership Agreements 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 Plant in Service Accumulated 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. The Registrants' proportionate share of their jointly-owned facility operating expenses is included in the corresponding operating expenses in the statements of income and each Registrant is responsible for providing its own financing. Assets Subject to Lien Mississippi Power provides retail service to its largest retail customer, Chevron Products Company (Chevron), at its refinery in Pascagoula, Mississippi through at least 2038 in accordance with agreements approved by the Mississippi PSC. The agreements grant Chevron a security interest in the co-generation assets located at the refinery and owned by Mississippi Power, with a lease receivable balance of $139 million at December 31, 2024, that is exercisable upon the occurrence of (i) certain bankruptcy events or (ii) other events of default coupled with specific reductions in steam output at the facility and a downgrade of Mississippi Power's credit rating to below investment grade by two of the three rating agencies. See Note 9 under "Lessor" for additional information. See Note 8 under "Long-term Debt" for information regarding debt secured by certain assets of Georgia Power and Southern Company Gas.

ASSET RETIREMENT OBLIGATIONS

ASSET RETIREMENT OBLIGATIONS	12 Months Ended
	Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]
ASSET RETIREMENT OBLIGATIONS	ASSET RETIREMENT OBLIGATIONS AROs are computed as the present value of the estimated costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The estimated costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities. Each traditional electric operating company and natural gas distribution utility has received accounting guidance from its state PSC or applicable state regulatory agency allowing the continued accrual or recovery of other retirement costs for long-lived assets that it does not have a legal obligation to retire. Accordingly, the accumulated removal costs for these obligations are reflected in the balance sheets as regulatory liabilities and amounts to be recovered are reflected in the balance sheets as regulatory assets. The ARO liabilities for the traditional electric operating companies primarily relate to facilities that are subject to the CCR Rule and the related state rules, principally surface impoundments. In addition, Alabama Power and Georgia Power have retirement obligations related to the decommissioning of nuclear facilities (Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle). See "Nuclear Decommissioning" herein for additional information. Other significant AROs include various landfill sites and asbestos removal for Alabama Power, Georgia Power, and Mississippi Power and gypsum cells and mine reclamation for Mississippi Power. The ARO liability for Southern Power primarily relates to its solar and wind facilities, which are located on long-term land leases requiring the restoration of land at the end of the lease. The traditional electric operating companies and Southern Company Gas also have identified other retirement obligations, such as obligations related to certain electric transmission and distribution facilities, certain asbestos-containing material within long-term assets not subject to ongoing repair and maintenance activities, certain wireless communication towers, the disposal of polychlorinated biphenyls in certain transformers, leasehold improvements, equipment on customer property, and property associated with the Southern Company system's rail lines and natural gas pipelines. However, liabilities for the removal of these assets have not been recorded because the settlement timing for certain retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these retirement obligations will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO. Southern Company and the traditional electric operating companies will continue to recognize in their respective statements of income allowed removal costs in accordance with regulatory treatment. Any differences between costs recognized in accordance with accounting standards related to asset retirement and environmental obligations and those reflected in rates are recognized as either a regulatory asset or liability in the balance sheets as ordered by the various state PSCs. Details of the AROs included in the balance sheets are as follows: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power (*) (in millions) Balance at December 31, 2022 $ 10,840 $ 4,287 $ 6,034 $ 179 $ 144 Liabilities incurred 90 — 90 — — Liabilities settled (617) (270) (304) (18) — Accretion expense 403 156 230 5 6 Cash flow revisions (399) (15) (385) 2 — Balance at December 31, 2023 $ 10,317 $ 4,158 $ 5,665 $ 168 $ 150 Liabilities incurred 130 8 120 — 2 Liabilities settled (566) (254) (270) (17) — Accretion expense 400 153 232 5 7 Cash flow revisions (347) (7) (332) (8) — Balance at December 31, 2024 $ 9,934 $ 4,058 $ 5,415 $ 148 $ 159 (*) Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets. In June 2023, Alabama Power completed an updated decommissioning cost site study for Plant Farley. The estimated cost of decommissioning based on the study resulted in a decrease in Alabama Power's ARO liability of approximately $15 million. See "Nuclear Decommissioning" herein for additional information. Following initial criticality for Plant Vogtle Unit 3 and 4 on March 6, 2023 and February 14, 2024, respectively, Georgia Power recorded AROs of approximately $90 million and $118 million, respectively. See "Nuclear Decommissioning" herein and Note 2 under "Georgia Power – Nuclear Construction" for additional information. In September 2023 and November 2023, Georgia Power recorded net decreases of approximately $175 million and $210 million, respectively, to its AROs related to the CCR Rule and the related state rule resulting from changes in estimates, including lower future inflation rates and the timing of closure activities. In September 2024, Georgia Power completed updated decommissioning cost site studies for Plants Hatch and Vogtle Units 1 through 4. The estimated cost of decommissioning based on the studies resulted in a decrease in Georgia Power's ARO liability of $389 million. See "Nuclear Decommissioning" herein for additional information. In November 2024, Georgia Power recorded a net increase of approximately $60 million to its AROs related to the CCR Rule and the related state rule resulting from changes in estimates, including higher future inflation rates and the timing of closure activities. The cost estimates for AROs related to the disposal of CCR are based on information at December 31, 2024 using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule and the related state rules. The traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to these assumptions becomes available. Some of these updates have been, and future updates may be, material. The cost estimates for Alabama Power are based on closure-in-place for all surface impoundments. The cost estimates for Georgia Power and Mississippi Power are based on a combination of closure-in-place for some surface impoundments and closure by removal for others. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. Absent continued recovery of ARO costs through regulated rates, results of operations, cash flows, and financial condition for Southern Company and the traditional electric operating companies could be materially impacted. The ultimate outcome of these matters cannot be determined at this time. See Note 3 under "General Litigation Matters – Alabama Power" for additional information. Nuclear Decommissioning The NRC requires licensees of commercial nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. Alabama Power and Georgia Power have external trust funds (Funds) to comply with the NRC's regulations. Use of the Funds is restricted to nuclear decommissioning activities. The Funds are managed and invested in accordance with applicable requirements of various regulatory bodies, including the NRC, the FERC, and state PSCs, as well as the IRS. While Alabama Power and Georgia Power are allowed to prescribe an overall investment policy to the Funds' managers, neither Southern Company nor its subsidiaries or affiliates are allowed to engage in the day-to-day management of the Funds or to mandate individual investment decisions. Day-to-day management of the investments in the Funds is delegated to unrelated third-party managers with oversight by the management of Alabama Power and Georgia Power. The Funds' managers are authorized, within certain investment guidelines, to actively buy and sell securities at their own discretion in order to maximize the return on the Funds' investments. The Funds are invested in a tax-efficient manner in a diversified mix of equity and fixed income securities and are reported as trading securities. Alabama Power and Georgia Power record the investment securities held in the Funds at fair value, as disclosed in Note 13, as management believes that fair value best represents the nature of the Funds. Gains and losses, whether realized or unrealized, are recorded in the regulatory liability for AROs in the balance sheets and are not included in net income or OCI. Fair value adjustments and realized gains and losses are determined on a specific identification basis. Investment securities in the Funds at December 31, 2024 and 2023 were as follows: Southern Company Alabama Georgia (in millions) At December 31, 2024: Equity securities $ 1,413 $ 848 $ 565 Debt securities 976 335 641 Other securities 232 202 30 Total investment securities in the Funds $ 2,621 $ 1,385 $ 1,236 At December 31, 2023: Equity securities $ 1,288 $ 796 $ 492 Debt securities 895 277 618 Other securities 239 186 53 Total investment securities in the Funds $ 2,422 $ 1,259 $ 1,163 These amounts exclude receivables related to investment income and pending investment sales and payables related to pending investment purchases. The fair value increases (decreases) of the Funds, including unrealized gains (losses) and reinvested interest and dividends and excluding the Funds' expenses, for 2024, 2023, and 2022 are shown in the table below. Southern Company Alabama Georgia (in millions) Fair value increases (decreases) 2024 $ 229 $ 143 $ 86 2023 281 157 124 2022 (360) (171) (189) Unrealized gains (losses) At December 31, 2024 $ 113 $ 64 $ 49 At December 31, 2023 241 119 122 At December 31, 2022 (391) (204) (187) The investment securities held in the Funds continue to be managed with a long-term focus. Accordingly, all purchases and sales within the Funds are presented separately in the statements of cash flows as investing cash flows, consistent with the nature of the securities and purpose for which the securities were acquired. For Alabama Power, approximately $12 million and $13 million at December 31, 2024 and 2023, respectively, previously recorded in internal reserves is being transferred into the Funds through 2040 as approved by the Alabama PSC. The NRC's minimum external funding requirements are based on a generic estimate of the cost to decommission only the radioactive portions of a nuclear unit based on the size and type of reactor. Alabama Power and Georgia Power have filed plans with the NRC designed to ensure that, over time, the deposits and earnings of the Funds will provide the minimum funding amounts prescribed by the NRC. At December 31, 2024 and 2023, the accumulated provisions for the external decommissioning trust funds were as follows: 2024 2023 (in millions) Alabama Power Plant Farley $ 1,385 $ 1,259 Georgia Power Plant Hatch $ 735 $ 705 Plant Vogtle Units 1 and 2 460 434 Plant Vogtle Units 3 and 4 41 24 Total $ 1,236 $ 1,163 Site study cost is the estimate to decommission a specific facility as of the site study year. The decommissioning cost estimates are based on removal of the plant from service and prompt dismantlement. The actual decommissioning costs may vary from these estimates because of changes in the assumed date of decommissioning, changes in NRC requirements, or changes in the assumptions used in making these estimates. The estimated costs of decommissioning at December 31, 2024 based on the most current studies were as follows: Alabama Power Georgia Power Plant Plant Hatch (*) Plant Vogtle Units 1 and 2 (*) Plant Vogtle Unit 3 and 4 (*) Most current study year 2023 2024 2024 2024 Decommissioning periods: Beginning year 2037 2034 2047 2062 Completion year 2087 2088 2092 2074 (in millions) Site study costs: Radiated structures $ 1,402 $ 795 $ 674 $ 599 Spent fuel management 513 306 255 88 Non-radiated structures 133 77 107 89 Total site study costs $ 2,048 $ 1,178 $ 1,036 $ 776 (*) Based on Georgia Power's ownership interests. For ratemaking purposes, Alabama Power's decommissioning costs are based on the site study and Georgia Power's decommissioning costs are based on the NRC generic estimate to decommission the radioactive portion of the facilities and the site study estimate for spent fuel management. Significant assumptions used to determine these costs for ratemaking were an estimated inflation rate of 4.5% for Plant Farley, 2.5% for Plants Hatch and Vogtle Units 1 and 2, and 2.3% for Plant Vogtle Units 3 and 4 and an estimated trust earnings rate of 7.0% for Plant Farley, 4.5% for Plants Hatch and Vogtle Units 1 and 2, and 4.3% for Plant Vogtle Units 3 and 4. Amounts previously contributed to the Funds for Plant Farley are currently projected to be adequate to meet the decommissioning obligations. Alabama Power's site-specific estimates of decommissioning costs for Plant Farley are updated every five years. The next site study for Alabama Power is expected to be completed in 2028. Projections of funds are reviewed with the Alabama PSC to ensure that, over time, the deposits and earnings of the Funds will provide adequate funding to cover the site-specific costs. If necessary, Alabama Power would seek the Alabama PSC's approval to address any changes in a manner consistent with NRC and other applicable requirements. Under the 2019 ARP, Georgia Power's annual decommissioning cost for ratemaking in 2022 was a total of $4 million for Plant Hatch and Plant Vogtle Units 1 and 2. Effective January 1, 2023, as approved in the 2022 ARP, there is no annual decommissioning cost for ratemaking for Plant Hatch and Plant Vogtle Units 1 and 2. Any funding amount required by the NRC during the period covered by the 2022 ARP will be deferred to a regulatory asset and recovery is expected to be determined in Georgia Power's next base rate case. See Note 2 under "Georgia Power – Rate Plans – 2022 ARP" for additional information. Effective August 1, 2023, as approved under the Plant Vogtle Unit 3 and Common Facilities rate proceeding, Georgia Power's annual decommissioning cost for ratemaking is $8 million for Plant Vogtle Unit 3. Effective May 1, 2024, as approved under the Prudency Stipulation, Georgia Power's annual decommissioning cost for ratemaking is $8 million for Plant Vogtle Unit 4. See Note 2 under "Georgia Power – Nuclear Construction – Regulatory Matters" for additional information.

CONSOLIDATED ENTITIES AND EQUIT

CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS	12 Months Ended
	Dec. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]
CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS	CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS The Registrants may hold ownership interests in a number of business ventures with varying ownership structures. Partnership interests and other variable interests are evaluated to determine if each entity is a VIE. If a venture is a VIE for which a Registrant is the primary beneficiary, the assets, liabilities, and results of operations of the entity are consolidated. The Registrants reassess the conclusion as to whether an entity is a VIE upon certain occurrences, which are deemed reconsideration events. For entities that are not determined to be VIEs, the Registrants evaluate whether they have control or significant influence over the investee to determine the appropriate consolidation and presentation. Generally, entities under the control of a Registrant are consolidated, and entities over which a Registrant can exert significant influence, but which a Registrant does not control, are accounted for under the equity method of accounting. Investments accounted for under the equity method are recorded within equity investments in unconsolidated subsidiaries in the balance sheets and, for Southern Company and Southern Company Gas, the equity income is recorded within earnings from equity method investments in the statements of income. See "SEGCO" and "Southern Company Gas" herein for additional information. Southern Company At December 31, 2024 and 2023, Southern Holdings had equity method investments totaling $128 million and $126 million, respectively, primarily related to investments in venture capital funds focused on energy and utility investments. Earnings/losses from these investments were immaterial for all periods presented. SEGCO Alabama Power and Georgia Power own equally all of the outstanding capital stock of SEGCO, which owns electric generating units at Plant Gaston with a total rated capacity of 1,020 MWs, as well as associated transmission facilities. Retirement of SEGCO's generating units is currently expected to occur by December 31, 2028. However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. See Note 2 under "Georgia Power – Integrated Resource Plans – 2025 IRP" for additional information. Alabama Power and Georgia Power account for SEGCO using the equity method; Southern Company consolidates SEGCO. The capacity of these units is sold equally to Alabama Power and Georgia Power. Alabama Power and Georgia Power make payments sufficient to provide for the operating expenses, taxes, interest expense, and an ROE. The share of purchased power included in purchased power, affiliates in the statements of income totaled $115 million in 2024, $112 million in 2023, and $124 million in 2022 for Alabama Power and $118 million in 2024, $115 million in 2023, and $127 million in 2022 for Georgia Power. SEGCO paid dividends of $20 million in 2024, $25 million in 2023, and $14 million in 2022, one half of which were paid to each of Alabama Power and Georgia Power. In addition, Alabama Power and Georgia Power each recognize 50% of SEGCO's net income. Alabama Power, which owns and operates a generating unit adjacent to the SEGCO generating units, has a joint ownership agreement with SEGCO for the ownership of an associated gas pipeline. Alabama Power owns 14% of the pipeline with the remaining 86% owned by SEGCO. See Note 3 under "Guarantees" for additional information regarding guarantees of Alabama Power and Georgia Power related to SEGCO. Southern Power Variable Interest Entities Southern Power has certain subsidiaries that are determined to be VIEs. Southern Power is considered the primary beneficiary of these VIEs because it controls the most significant activities of the VIEs, including operating and maintaining the respective assets, and has the obligation to absorb expected losses of these VIEs to the extent of its equity interests. SP Solar and SP Wind SP Solar is owned by Southern Power and a limited partner. A wholly-owned subsidiary of Southern Power is the general partner and holds a 1% ownership interest, and another wholly-owned subsidiary of Southern Power owns a 66% ownership interest. The limited partner holds the remaining 33% noncontrolling interest. SP Solar qualifies as a VIE since the arrangement is structured as a limited partnership and the 33% limited partner does not have substantive kick-out rights against the general partner. At December 31, 2024 and 2023, SP Solar had total assets of $5.4 billion and $5.6 billion, respectively, total liabilities of $372 million and $399 million, respectively, and noncontrolling interests of $1.0 billion. Cash distributions from SP Solar are allocated 67% to Southern Power and 33% to the limited partner in accordance with their partnership interest percentage. Under the terms of the limited partnership agreement, distributions without limited partner consent are limited to available cash and SP Solar is obligated to distribute all such available cash to its partners each quarter. Available cash includes all cash generated in the quarter subject to the maintenance of appropriate operating reserves. SP Wind is owned by Southern Power and three financial investors. A wholly-owned subsidiary of Southern Power owns 100% of the Class B membership interests and the three financial investors own 100% of the Class A membership interests. SP Wind qualifies as a VIE since the structure of the arrangement is similar to a limited partnership and the Class A members do not have substantive kick-out rights against Southern Power. At December 31, 2024 and 2023, SP Wind had total assets of $2.0 billion and $2.1 billion, respectively, total liabilities of $177 million and $187 million, respectively, and noncontrolling interests of $35 million and $38 million, respectively. Under the terms of the limited liability agreement, distributions without Class A member consent are limited to available cash and SP Wind is obligated to distribute all such available cash to its members each quarter. Available cash includes all cash generated in the quarter subject to the maintenance of appropriate operating reserves. Cash distributions from SP Wind are generally allocated 60% to Southern Power and 40% to the three financial investors in accordance with the limited liability agreement. Southern Power consolidates both SP Solar and SP Wind, as the primary beneficiary, since it controls the most significant activities of each entity, including operating and maintaining their assets. Certain transfers and sales of the assets in the VIEs are subject to partner consent and the liabilities are non-recourse to the general credit of Southern Power. Liabilities consist of customary working capital items and do not include any long-term debt. Other Variable Interest Entities Southern Power has other consolidated VIEs that relate to certain subsidiaries that have either sold noncontrolling interests to tax equity investors or acquired less than a 100% interest from facility developers. These entities are considered VIEs because the arrangements are structured similar to a limited partnership and the noncontrolling members do not have substantive kick-out rights. At December 31, 2024 and 2023, the other VIEs had total assets of $1.6 billion and $1.7 billion, respectively, total liabilities of $224 million and $230 million, respectively, and noncontrolling interests of $691 million and 761 million, respectively. Under the terms of the partnership agreements, distributions of all available cash are required each month or quarter and additional distributions require partner consent. Equity Method Investments During 2023 and 2022, Southern Power sold its remaining equity method investments in wind projects and received proceeds totaling $50 million and $38 million, respectively. Earnings (loss) from these investments, including the gains associated with the sales, were immaterial for 2023 and 2022. Southern Company Gas The carrying amounts of Southern Company Gas' equity method investments at December 31, 2024 and 2023 were as follows: Investment Balance December 31, 2024 December 31, 2023 (in millions) SNG $ 1,245 $ 1,202 Other 34 33 Total $ 1,279 $ 1,235 The earnings from Southern Company Gas' equity method investment related to SNG were $146 million in 2024, $139 million in 2023, and $146 million in 2022. The earnings from Southern Company Gas' other equity method investments were immaterial for all periods presented.

FINANCING

FINANCING	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
FINANCING	FINANCING Long-term Debt Details of long-term debt at December 31, 2024 and 2023 are provided in the following table: At December 31, 2024 Balance Outstanding at Maturity Weighted Average 2024 2023 (in millions) Southern Company Senior notes (a) 2025-2074 4.33% $ 44,862 $ 40,235 Junior subordinated notes 2027-2081 4.32% 7,389 8,333 FFB loans (b) 2025-2044 2.88% 4,703 4,788 Revenue bonds (c) 2025-2063 3.15% 3,379 3,400 First mortgage bonds (d) 2025-2064 3.79% 2,775 2,500 Medium-term notes 2026-2027 7.03% 84 84 Other long-term debt 2025-2045 4.96% 209 234 Finance lease obligations (e) 287 298 Unamortized fair value adjustment 275 302 Unamortized debt premium (discount), net (58) (198) Unamortized debt issuance expenses (419) (290) Total long-term debt 63,486 59,686 Less: Amount due within one year 4,718 2,476 Total long-term debt excluding amount due within one year $ 58,768 $ 57,210 Alabama Power Senior notes 2025-2073 3.94% $ 9,875 $ 9,875 Revenue bonds (c) 2025-2063 3.11% 1,300 1,321 Other long-term debt 2026-2030 6.11% 61 75 Finance lease obligations (e) 4 5 Unamortized debt premium (discount), net (19) (20) Unamortized debt issuance expenses (67) (73) Total long-term debt 11,154 11,183 Less: Amount due within one year 655 223 Total long-term debt excluding amount due within one year $ 10,499 $ 10,960 Georgia Power Senior notes 2025-2074 4.49% $ 11,292 $ 9,575 Junior subordinated notes 2077 5.00% 270 270 FFB loans (b) 2025-2044 2.88% 4,703 4,788 Revenue bonds (c) 2025-2062 3.18% 1,968 1,968 Finance lease obligations (e) 261 240 Unamortized debt premium (discount), net (21) (19) Unamortized debt issuance expenses (123) (122) Total long-term debt 18,350 16,700 Less: Amount due within one year 966 502 Total long-term debt excluding amount due within one year $ 17,384 $ 16,198 At December 31, 2024 Balance Outstanding at Maturity Weighted Average 2024 2023 (in millions) Mississippi Power Senior notes 2026-2054 4.33% $ 1,575 $ 1,525 Revenue bonds (c) 2025-2052 3.16% 111 111 Finance lease obligations (e) 14 16 Unamortized debt premium (discount), net 2 1 Unamortized debt issuance expenses (9) (9) Total long-term debt 1,693 1,644 Less: Amount due within one year 12 201 Total long-term debt excluding amount due within one year $ 1,681 $ 1,443 Southern Power Senior notes (a) 2025-2046 4.05% $ 2,695 $ 2,728 Unamortized debt premium (discount), net (4) (4) Unamortized debt issuance expenses (11) (13) Total long-term debt 2,680 2,711 Less: Amount due within one year 500 — Total long-term debt excluding amount due within one year $ 2,180 $ 2,711 Southern Company Gas Senior notes 2025-2051 4.41% $ 5,375 $ 4,930 First mortgage bonds (d) 2025-2064 3.79% 2,775 2,500 Medium-term notes 2026-2027 7.03% 84 84 Other long-term debt 2025-2045 3.81% 68 59 Unamortized fair value adjustment 275 302 Unamortized debt premium (discount), net (9) (8) Unamortized debt issuance expenses (37) (34) Total long-term debt 8,531 7,833 Less: Amount due within one year 302 — Total long-term debt excluding amount due within one year $ 8,229 $ 7,833 (a) Includes a fair value gain (loss) of $(45) million and $(12) million at December 31, 2024 and 2023, respectively, related to Southern Power's foreign currency hedge on its euro-denominated senior notes. (b) Secured by a first priority lien on (i) Georgia Power's undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the units, the related real property, and any nuclear fuel loaded in the reactor core) and (ii) Georgia Power's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4. See "DOE Loan Guarantee Borrowings" herein for additional information. (c) Revenue bond obligations represent loans to the traditional electric operating companies from public authorities of funds derived from sales by such authorities of revenue bonds issued to finance pollution control and solid waste disposal and wastewater facilities. In some cases, the revenue bond obligations represent obligations under installment sales agreements with respect to facilities constructed with the proceeds of revenue bonds issued by public authorities. The traditional electric operating companies are required to make payments sufficient for the authorities to meet principal and interest requirements of such bonds. Proceeds from certain issuances are restricted until qualifying expenditures are incurred. (d) Secured by substantially all of Nicor Gas' properties. (e) Secured by the underlying lease ROU asset. See Note 9 for additional information. Maturities of long-term debt for the next five years are as follows: Southern Company (a) Alabama Power (b) Georgia Power (c) Mississippi Power Southern Power (d) Southern Company (in millions) 2025 $ 4,727 $ 658 $ 967 $ 12 $ 500 $ 300 2026 3,792 47 451 66 964 530 2027 4,075 551 1,015 10 — 154 2028 2,827 107 868 357 — 150 2029 1,990 — 861 1 — 150 (a) See notes (b), (c), and (d) below. (b) Alabama Power's 2025 maturities include $200 million aggregate principal amount of Series 2023A Floating Rate Senior Notes due May 15, 2073 that are repayable at the option of the holders at certain dates that began in 2024. As a result, the senior notes are classified as securities due within one year on the balance sheets of Southern Company and Alabama Power at December 31, 2024. (c) Amounts include principal amortization related to the FFB borrowings; however, the final maturity date is February 20, 2044. See "DOE Loan Guarantee Borrowings" herein for additional information. Georgia Power's 2025 maturities include approximately $117 million aggregate principal amount of Series 2024C Floating Rate Senior Notes due November 15, 2074 that are repayable at the option of the holders at certain dates beginning in 2025. As a result, the senior notes are classified as securities due within one year on the balance sheets of Southern Company and Georgia Power at December 31, 2024. (d) Southern Power's 2026 maturities include $564 million of euro-denominated debt at the U.S. dollar-denominated hedge settlement amount. DOE Loan Guarantee Borrowings Pursuant to the loan guarantee program established under Title XVII of the Energy Policy Act of 2005 (Title XVII Loan Guarantee Program), Georgia Power and the DOE entered into a loan guarantee agreement in 2014 and the Amended and Restated Loan Guarantee Agreement in 2019. Under the Amended and Restated Loan Guarantee Agreement, the DOE agreed to guarantee the obligations of Georgia Power under the FFB Credit Facilities. Under the FFB Credit Facilities, Georgia Power was authorized to make term loan borrowings through the FFB in an amount up to approximately $5.130 billion. In 2021, Georgia Power made the final borrowings under the FFB Credit Facilities and no further borrowings are permitted. During 2024, Georgia Power made principal amortization payments of $86 million under the FFB Credit Facilities. At December 31, 2024 and 2023, Georgia Power had $4.7 billion and $4.8 billion of borrowings outstanding under the FFB Credit Facilities, respectively. All borrowings under the FFB Credit Facilities are full recourse to Georgia Power, and Georgia Power is obligated to reimburse the DOE for any payments the DOE is required to make to the FFB under its guarantee. Georgia Power's reimbursement obligations to the DOE are secured by a first priority lien on (i) Georgia Power's undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the units, the related real property, and any nuclear fuel loaded in the reactor core) and (ii) Georgia Power's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4. There are no restrictions on Georgia Power's ability to grant liens on other property. The final maturity date for each advance under the FFB Credit Facilities is February 20, 2044. Interest is payable quarterly and principal payments began in 2020. Each borrowing under the FFB Credit Facilities bears interest at a fixed rate equal to the applicable U.S. Treasury rate at the time of the borrowing plus a spread equal to 0.375%. Under the Amended and Restated Loan Guarantee Agreement, Georgia Power is subject to customary borrower affirmative and negative covenants and events of default. In addition, Georgia Power is subject to project-related reporting requirements and other project-specific covenants and events of default. In the event certain mandatory prepayment events occur, Georgia Power will be required to prepay the outstanding principal amount of all borrowings under the FFB Credit Facilities over a period of five years (with level principal amortization). Among other things, these mandatory prepayment events include (i) loss of necessary governmental approvals for operation of Plant Vogtle Units 3 and 4; (ii) loss of regulation by the Georgia PSC; (iii) cost disallowances by the Georgia PSC that could have a material adverse effect on Georgia Power's ability to repay the outstanding borrowings under the FFB Credit Facilities; (iv) certain material casualty losses or a governmental taking of Plant Vogtle Units 3 and 4; or (v) loss of access to the intellectual property rights necessary to operate Plant Vogtle Units 3 and 4. Under certain circumstances, insurance proceeds and any proceeds from an event of taking must be applied to immediately prepay outstanding borrowings under the FFB Credit Facilities. Georgia Power also may voluntarily prepay outstanding borrowings under the FFB Credit Facilities. Under the FFB Credit Facilities, any prepayment (whether mandatory or optional) will be made with a make-whole premium or discount, as applicable. See Note 2 under "Georgia Power – Nuclear Construction" for additional information. Secured Debt Each of Southern Company's subsidiaries is organized as a legal entity, separate and apart from Southern Company and its other subsidiaries. There are no agreements or other arrangements among the Southern Company system companies under which the assets of one company have been pledged or otherwise made available to satisfy obligations of Southern Company or any of its other subsidiaries. As discussed under "Long-term Debt" herein, the Registrants had secured debt outstanding at December 31, 2024 and 2023. Each Registrant's senior notes, junior subordinated notes, revenue bond obligations, bank term loans, credit facility borrowings, and notes payable are effectively subordinated to all secured debt of each respective Registrant. Equity Units In May 2022, Southern Company remarketed $862.5 million aggregate principal amount of its Series 2019A Remarketable Junior Subordinated Notes due August 1, 2024 (2019A RSNs) and $862.5 million aggregate principal amount of its Series 2019B Remarketable Junior Subordinated Notes due August 1, 2027 (2019B RSNs), pursuant to the terms of its 2019 Series A Equity Units (Equity Units). In connection with the remarketing, the interest rates on the 2019A RSNs and the 2019B RSNs were reset to 4.475% and 5.113%, respectively, payable on a semi-annual basis. In August 2022, the proceeds were ultimately used to settle the purchase contracts entered into as part of the Equity Units and Southern Company issued approximately 25.2 million shares of common stock and received proceeds of $1.725 billion. In August 2024, Southern Company repaid at maturity the $862.5 million 2019A RSNs. At December 31, 2023, the 2019A RSNs were included on Southern Company's consolidated balance sheet in securities due within one year. At December 31, 2024 and 2023, the 2019B RSNs were included on Southern Company's consolidated balance sheets in long-term debt. Convertible Senior Notes In May 2024, Southern Company issued $1.5 billion aggregate principal amount of Series 2024A 4.50% Convertible Senior Notes due June 15, 2027 (Series 2024A Convertible Senior Notes). In February 2023, Southern Company issued $1.5 billion aggregate principal amount of Series 2023A 3.875% Convertible Senior Notes due December 15, 2025 (Series 2023A Convertible Senior Notes). In March 2023, Southern Company issued an additional $225 million aggregate principal amount of the Series 2023A Convertible Senior Notes upon the exercise by the initial purchasers of their over-allotment option. Interest on the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes is payable semiannually. The Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes will mature on June 15, 2027 and December 15, 2025, respectively, unless earlier converted or repurchased, but are not redeemable at the option of Southern Company. Both the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes are direct, unsecured, and unsubordinated obligations of Southern Company, ranking equally with all of Southern Company's other unsecured and unsubordinated indebtedness from time to time outstanding, and are effectively subordinated to all secured indebtedness of Southern Company. Under the following circumstances, holders may convert their Series 2024A Convertible Senior Notes and their Series 2023A Convertible Senior Notes at their option prior to the close of business on the business day preceding March 15, 2027 and September 15, 2025, respectively: • during any calendar quarter (and only during such calendar quarter), if the last reported sale price of Southern Company's common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the applicable conversion price of the Series 2024A Convertible Senior Notes or the Series 2023A Convertible Senior Notes, as the case may be, on each applicable trading day as determined by Southern Company; • during the five business day period after any 10 consecutive trading day period (Measurement Period) in which the applicable trading price per $1,000 principal amount of Series 2024A Convertible Senior Notes or Series 2023A Convertible Senior Notes, as the case may be, for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price of the common stock and the applicable conversion rate on each such trading day; or • upon the occurrence of certain corporate events specified in the respective supplemental indentures governing the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes. On or after March 15, 2027, for the Series 2024A Convertible Senior Notes, and September 15, 2025, for the Series 2023A Convertible Senior Notes, a holder may convert all or any portion of its Series 2024A Convertible Senior Notes or its Series 2023A Convertible Senior Notes, as the case may be. at any time prior to the close of business on the second scheduled trading day immediately preceding the applicable maturity date regardless of the foregoing conditions. Southern Company will settle conversions of the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes by paying cash up to the aggregate principal amount of the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes to be converted and paying or delivering, as the case may be, cash, shares of common stock, or a combination of cash and shares of common stock, at Southern Company's election, in respect of the remainder, if any, of Southern Company's conversion obligation in excess of the aggregate principal amount of the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes being converted. The Series 2024A Convertible Senior Notes are initially convertible at a rate of 10.8166 shares of common stock per $1,000 principal amount converted, which is approximately equal to $92.45 per share of common stock. The Series 2023A Convertible Senior Notes are initially convertible at a rate of 11.8818 shares of common stock per $1,000 principal amount converted, which is approximately equal to $84.16 per share of common stock. These conversion rates will be subject to adjustment upon the occurrence of certain specified events but will not be adjusted for accrued and unpaid interest. In addition, upon the occurrence of a make-whole fundamental change (as defined in the respective supplemental indentures governing the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes), Southern Company will, in certain circumstances, increase the applicable conversion rate by a number of additional shares of common stock for conversions in connection with the make-whole fundamental change. Upon the occurrence of a fundamental change (as defined in the respective supplemental indentures governing the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes), holders of the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes may require Southern Company to purchase all or a portion of their Series 2024A Convertible Senior Notes and their Series 2023A Convertible Senior Notes, in principal amounts equal to $1,000 or an integral multiple thereof, for cash at a price equal to 100% of the principal amount of the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes to be purchased plus any accrued and unpaid interest. Equity Distribution Agreement In May 2024, Southern Company established an at-the-market program by entering into an equity distribution agreement pursuant to which it may sell, from time to time, up to an aggregate of 50 million shares of its common stock, including through forward sale contracts. In November 2024, Southern Company entered into separate forward sale contracts with forward purchasers for the sale of: • 1,000,000 shares of common stock with an initial forward price of $86.5645 per share and • 1,000,000 shares of common stock with an initial forward price of $87.9658 per share. In addition, in December 2024, Southern Company entered into a forward sale contract with a forward purchaser for the sale of 436,614 shares of its common stock, 143,920 of which had been sold by the forward seller as of December 31, 2024, with the remaining 292,694 shares sold subsequent to December 31, 2024, all with an initial forward price of $83.3293 per share. Each initial forward price is subject to adjustment under certain specified circumstances as specified in the forward sale contracts. Southern Company may settle each of the forward transactions in shares, cash, or net shares on or before December 31, 2025. As of December 31, 2024, no shares had been settled under these forward confirmations. Bank Credit Arrangements At December 31, 2024, committed credit arrangements with banks were as follows: Expires Company 2025 2026 2027 2029 Total Unused Expires within One Year (in millions) Southern Company parent (a) $ 150 $ — $ — $ 1,850 $ 2,000 $ 1,998 $ 150 Alabama Power (b) — 665 — 700 1,365 1,364 — Georgia Power 300 — — 1,750 2,050 2,026 300 Mississippi Power — — 275 — 275 275 — Southern Power (a)(c) — — — 600 600 600 — Southern Company Gas (d) 100 — — 1,500 1,600 1,598 100 SEGCO 30 — — — 30 30 30 Southern Company $ 580 $ 665 $ 275 $ 6,400 $ 7,920 $ 7,891 $ 580 (a) Arrangement expiring in 2029 represents a $2.45 billion combined arrangement for Southern Company and Southern Power allowing for flexible sublimits. (b) Includes $15 million expiring in 2026 at Alabama Property Company, a wholly-owned subsidiary of Alabama Power, of which $14 million was unused at December 31, 2024. Alabama Power is not party to this arrangement. (c) Does not include Southern Power Company's $75 million and $100 million continuing letter of credit facilities for standby letters of credit, expiring in 2027 and 2026, respectively , of which $16 million and $11 million, respectively, was unused at December 31, 2024. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities. (d) Southern Company Gas, as the parent entity, guarantees the obligations of Southern Company Gas Capital, which is the borrower of $800 million of the credit arrangement expiring in 2029. Southern Company Gas' committed credit arrangement expiring in 2029 also includes $700 million for which Nicor Gas is the borrower and which is restricted for working capital needs of Nicor Gas. Pursuant to the multi-year credit arrangement expiring in 2029, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. Nicor Gas is also the borrower under a $100 million credit arrangement expiring in 2025. See "Structural Considerations" herein for additional information. The bank credit arrangements require payment of commitment fees based on the unused portion of the commitments. Commitment fees average less than 1 / 4 of 1% for the Registrants and Nicor Gas. Subject to applicable market conditions, Southern Company and its subsidiaries expect to renew or replace their bank credit arrangements as needed, prior to expiration. In connection therewith, Southern Company and its subsidiaries may extend the maturity dates and/or increase or decrease the lending commitments thereunder. These bank credit arrangements, as well as the term loan arrangements of the Registrants, Nicor Gas, and SEGCO, contain covenants that limit debt levels and contain cross-acceleration provisions to other indebtedness (including guarantee obligations) that are restricted only to the indebtedness of the individual company. The cross-acceleration provisions to other indebtedness would trigger an event of default if the applicable borrower defaulted on indebtedness, the payment of which was then accelerated. Southern Company's, Mississippi Power's, Southern Company Gas', and Nicor Gas' credit arrangements contain covenants that limit debt levels to 70% of total capitalization, as defined in the agreements, and the other subsidiaries' bank credit arrangements contain covenants that limit debt levels to 65% of total capitalization, as defined in the agreements. For purposes of these definitions, debt excludes junior subordinated notes and, in certain arrangements, other hybrid securities. Additionally, for Southern Company and Southern Power, for purposes of these definitions, debt excludes any project debt incurred by certain subsidiaries of Southern Power to the extent such debt is non-recourse to Southern Power and capitalization excludes the capital stock or other equity attributable to such subsidiaries. At December 31, 2024, the Registrants, Nicor Gas, and SEGCO were in compliance with all such covenants. None of the bank credit arrangements contain material adverse change clauses at the time of borrowings. A portion of the unused credit with banks is allocated to provide liquidity support to certain revenue bonds of the traditional electric operating companies and the commercial paper programs of the Registrants, Nicor Gas, and SEGCO. At December 31, 2024, outstanding variable rate demand revenue bonds of the traditional electric operating companies with allocated liquidity support totaled approximately $1.7 billion (comprised of approximately $796 million at Alabama Power, $819 million at Georgia Power, and $69 million at Mississippi Power). In addition, at December 31, 2024, Alabama Power and Georgia Power had approximately $207 million and $157 million, respectively, of fixed rate revenue bonds outstanding that are required to be remarketed within the next 12 months. Alabama Power's $207 million of fixed rate revenue bonds are classified as securities due within one year on its balance sheets as they are not covered by long-term committed credit. All other variable rate demand revenue bonds and fixed rate revenue bonds required to be remarketed within the next 12 months are classified as long-term debt on the balance sheets as a result of available long-term committed credit. At both December 31, 2024 and 2023, Southern Power had $106 million of cash collateral posted related to PPA requirements, which is included in other deferred charges and assets on Southern Power's consolidated balance sheets. Notes Payable The Registrants, Nicor Gas, and SEGCO make short-term borrowings primarily through commercial paper programs that have the liquidity support of the committed bank credit arrangements described above under "Bank Credit Arrangements." Southern Power's subsidiaries are not parties or obligors to its commercial paper program. Southern Company Gas maintains commercial paper programs at Southern Company Gas Capital and at Nicor Gas. Nicor Gas' commercial paper program supports working capital needs at Nicor Gas as Nicor Gas is not permitted to make money pool loans to affiliates. All of Southern Company Gas' other subsidiaries benefit from Southern Company Gas Capital's commercial paper program. See "Structural Considerations" herein for additional information. In addition, Southern Company and certain of its subsidiaries have entered into various bank term loan agreements. Unless otherwise stated, the proceeds of these loans were used to repay existing indebtedness and for general corporate purposes, including working capital and, for the subsidiaries, their continuous construction programs. Commercial paper and short-term bank term loans are included in notes payable in the balance sheets. Details of short-term borrowings for the applicable Registrants were as follows: Notes Payable at December 31, 2024 Notes Payable at December 31, 2023 Amount Weighted Average Amount Weighted Average (in millions) (in millions) Southern Company Commercial paper $ 1,138 4.7 % $ 1,794 5.6 % Short-term bank debt 200 5.3 520 6.4 Total $ 1,338 4.8 % $ 2,314 5.7 % Alabama Power Commercial paper $ — — % $ 40 5.5 % Georgia Power Commercial paper $ — — % $ 809 5.6 % Short-term bank debt 200 5.3 520 6.4 Total $ 200 5.3 % $ 1,329 5.9 % Mississippi Power Commercial paper $ 14 4.6 % $ — — % Southern Power Commercial paper $ — — % $ 138 5.5 % Southern Company Gas Commercial paper: Southern Company Gas Capital $ 283 4.7 % $ 23 5.5 % Nicor Gas 172 4.6 392 5.5 Total $ 455 4.7 % $ 415 5.5 % See "Bank Credit Arrangements" herein for information on bank term loan covenants that limit debt levels and cross-acceleration or cross-default provisions. Outstanding Classes of Capital Stock Southern Company Common Stock Stock Issued During 2024, Southern Company issued approximately 5.8 million shares of common stock primarily through equity compensation plans. Shares Reserved At December 31, 2024, a total of 177 million shares were reserved for issuance pursuant to the Southern Investment Plan, employee savings plans, the Equity and Incentive Compensation Plan (which includes performance share units and restricted stock units as discussed in Note 12), an at-the-market program, and the Series 2024A Convertible Senior Notes and Series 2023A Convertible Senior Notes (as discussed under "Convertible Senior Notes" herein). Of the shares reserved, 25 million shares are available for awards under the Equity and Incentive Compensation Plan at December 31, 2024. Diluted Earnings Per Share For Southern Company, the only difference in computing basic and diluted earnings per share (EPS) is attributable to awards outstanding under stock-based compensation plans, the Series 2024A Convertible Senior Notes, the Series 2023A Convertible Senior Notes, and forward sale contracts pursuant to the equity distribution agreement. EPS dilution resulting from stock-based compensation plans and the forward sale contracts is determined using the treasury stock method, and EPS dilution resulting from the Series 2024A Convertible Senior Notes and the Series 2023A Convertible Senior Notes is determined using the net share settlement method. See Note 12 and "Convertible Senior Notes" and "Equity Distribution Agreement" herein for additional information. Shares used to compute diluted EPS were as follows: Average Common Stock Shares 2024 2023 2022 (in millions) As reported shares 1,096 1,092 1,075 Effect of stock-based compensation 6 6 6 Diluted shares 1,102 1,098 1,081 For all periods presented, an immaterial number of stock-based compensation awards was excluded from the diluted EPS calculation because the awards were anti-dilutive. For 2024, there was no dilution resulting from the Series 2024A Convertible Senior Notes and the forward sale contracts, and the dilution resulting from the Series 2023A Convertible Senior Notes was immaterial. Preferred Stock of Subsidiaries As discussed further under "Alabama Power" herein, during 2022, Alabama Power redeemed all of its preferred stock and Class A preferred stock. Alabama Power Alabama Power has preferred stock, Class A preferred stock, preference stock, and common stock authorized, but only common stock outstanding at December 31, 2024. During 2022, Alabama Power redeemed all of its preferred stock and Class A preferred stock at the redemption prices per share provided in the table below, plus accrued and unpaid dividends to the redemption date. Preferred Stock Redeemed During 2022 Par Value/Stated Capital Per Share Shares Redemption 4.92% Preferred Stock $100 80,000 $103.23 4.72% Preferred Stock $100 50,000 $102.18 4.64% Preferred Stock $100 60,000 $103.14 4.60% Preferred Stock $100 100,000 $104.20 4.52% Preferred Stock $100 50,000 $102.93 4.20% Preferred Stock $100 135,115 $105.00 5.00% Class A Preferred Stock $25 10,000,000 $25.00 Georgia Power Georgia Power has preferred stock, Class A preferred stock, preference stock, and common stock authorized, but only common stock outstanding. Mississippi Power Dividend Restrictions The income of Southern Company is derived primarily from equity in earnings of its subsidiaries. At December 31, 2024, consolidated retained earnings included $6.5 billion of undistributed retained earnings of the subsidiaries. The traditional electric operating companies and Southern Power can only pay dividends to Southern Company out of retained earnings or paid-in-capital. See Note 7 under "Southern Power" for information regarding the distribution requirements for certain Southern Power subsidiaries. By regulation, Nicor Gas is restricted, up to its retained earnings balance, in the amount it can dividend or loan to affiliates and is not permitted to make money pool loans to affiliates. At December 31, 2024, the amount of Southern Company Gas' subsidiary retained earnings available for dividend payment totaled $1.6 billion. Structural Considerations Since Southern Company and Southern Company Gas are holding companies, the right of Southern Company and Southern Company Gas and, hence, the right of creditors of Southern Company or Southern Company Gas to participate in any distribution of the assets of any respective subsidiary of Southern Company or Southern Company Gas, whether upon liquidation, reorganization or otherwise, is subject to prior claims of creditors and preferred stockholders of such subsidiary. Southern Company Gas Capital was established to provide for certain of Southern Company Gas' ongoing financing needs through a commercial paper program, the issuance of various debt, hybrid securities, and other financing arrangements. Southern Company Gas fully and unconditionally guarantees all debt issued by Southern Company Gas Capital. Nicor Gas is not permitted by regulation to make loans to affiliates or utilize Southern Company Gas Capital for its financing needs. Southern Power Company's senior notes, bank term loan, commercial paper, and bank credit arrangement are unsecured senior indebtedness, which rank equally with all other unsecured and unsubordinated debt of Southern Power Compan y. Southern Power's subsidiaries are not issuers, borrowers, or obligors, as applicable, under any of these unsecured senior debt arrangements, which are effectively subordinated to any future secured debt of Southern Power Company and any potential claims of creditors of Southern Power's subsidiaries.

LEASES

LEASES	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
LEASES	LEASES Lessee The Registrants recognize leases with a term of greater than 12 months on the balance sheet as lease obligations, representing the discounted future fixed payments due, along with ROU assets that will be amortized over the term of each lease. As lessee, the Registrants lease certain electric generating units (including renewable energy facilities), real estate/land, communication towers, railcars, and other equipment and vehicles. The major categories of lease obligations are as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) At December 31, 2024 Electric generating units (*) $ 672 $ 56 $ 1,509 $ — $ — $ — Real estate/land 834 3 45 2 540 20 Communication towers 118 2 4 — — 21 Railcars 64 31 29 4 — — Other 52 2 2 16 — — Total $ 1,740 $ 94 $ 1,589 $ 22 $ 540 $ 41 At December 31, 2023 Electric generating units (*) $ 670 $ 58 $ 1,028 $ — $ — $ — Real estate/land 871 4 54 2 546 28 Communication towers 123 1 4 — — 23 Railcars 64 32 27 5 — — Other 60 3 2 18 — — Total $ 1,788 $ 98 $ 1,115 $ 25 $ 546 $ 51 (*) Amounts related to affiliate leases are eliminated in consolidation for Southern Company. See "Contracts that Contain a Lease" herein for additional information. Real estate/land leases primarily consist of commercial real estate leases at Southern Company, Georgia Power, and Southern Company Gas and various land leases primarily associated with renewable energy facilities at Southern Power. The commercial real estate leases have remaining terms of up to 20 years while the land leases have remaining terms of up to 44 years, including renewal periods. Communication towers are leased for the installation of equipment to provide cellular phone service to customers and to support the automated meter infrastructure programs at the traditional electric operating companies and Nicor Gas. Communication tower leases have remaining terms of up to 16 years. Renewal options exist in many of the leases. The expected term used in calculating the lease obligation generally reflects only the noncancelable period of the lease unless it is considered reasonably certain that the lease will be extended. Land leases associated with renewable energy facilities at Southern Power and communication tower leases for automated meter infrastructure at Nicor Gas include renewal periods reasonably certain of exercise resulting in an expected lease term at least equal to the expected life of the renewable energy facilities and the automated meter infrastructure, respectively. Contracts that Contain a Lease While not specifically structured as a lease, some of the PPAs at Alabama Power and Georgia Power are deemed to represent a lease of the underlying electric generating units when the terms of the PPA convey the right to control the use of the underlying assets. Amounts recorded for leases of electric generating units are generally based on the amount of scheduled capacity payments due over the remaining term of the PPA, which varies between three Short-term Leases Leases with an initial term of 12 months or less are not recorded on the balance sheet; the Registrants generally recognize lease expense for these leases on a straight-line basis over the lease term. Residual Value Guarantees Residual value guarantees exist primarily in railcar leases at Alabama Power and Georgia Power, with Georgia Power's railcar leases terminating in June 2024. The amounts probable of being paid under those guarantees are included in the lease payments. All such amounts were immaterial at December 31, 2024 and 2023. Lease and Nonlease Components For all asset categories, with the exception of electric generating units, gas pipelines, and real estate leases, the Registrants combine lease payments and any nonlease components, such as asset maintenance, for purposes of calculating the lease obligation and the ROU asset. Balance sheet amounts recorded for operating and finance leases are as follows: Southern Company Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) At December 31, 2024 Operating Leases Operating lease ROU assets, net $ 1,386 $ 84 $ 1,331 $ 8 $ 484 $ 38 Operating lease obligations - current $ 200 $ 14 $ 169 $ 4 $ 29 $ 11 Operating lease obligations - non-current 1,253 76 1,159 4 511 30 Total operating lease obligations (*) $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance Leases Finance lease ROU assets, net $ 254 $ 4 $ 227 $ 14 $ — $ — Finance lease obligations - current $ 9 $ 1 $ 20 $ 1 $ — $ — Finance lease obligations - non-current 278 3 241 13 — — Total finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ — At December 31, 2023 Operating Leases Operating lease ROU assets, net $ 1,432 $ 87 $ 884 $ 9 $ 488 $ 47 Operating lease obligations - current $ 183 $ 12 $ 135 $ 3 $ 29 $ 11 Operating lease obligations - non-current 1,307 81 740 6 517 40 Total operating lease obligations (*) $ 1,490 $ 93 $ 875 $ 9 $ 546 $ 51 Finance Leases Finance lease ROU assets, net $ 272 $ 5 $ 203 $ 15 $ — $ — Finance lease obligations - current $ 11 $ 2 $ 18 $ 1 $ — $ — Finance lease obligations - non-current 287 3 222 15 — — Total finance lease obligations $ 298 $ 5 $ 240 $ 16 $ — $ — (*) Includes operating lease obligations related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $567 million, $55 million, and $1.3 billion, respectively, at December 31, 2024 and $566 million, $58 million, and $813 million, respectively, at December 31, 2023. If not presented separately on the Registrants' balance sheets, amounts related to leases are presented as follows: operating lease ROU assets, net are included in "other deferred charges and assets"; operating lease obligations are included in "other current liabilities" and "other deferred credits and liabilities," as applicable; finance lease ROU assets, net are included in "plant in service"; and finance lease obligations are included in "securities due within one year" and "long-term debt," as applicable. Lease costs for 2024, 2023, and 2022, which includes both amounts recognized as operations and maintenance expense and amounts capitalized as part of the cost of another asset, are as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease cost Operating lease cost (*) $ 248 $ 19 $ 190 $ 4 $ 27 $ 12 Finance lease cost: Amortization of ROU assets 20 2 23 1 — — Interest on lease obligations 15 — 15 1 — — Total finance lease cost 35 2 38 2 — — Short-term lease costs 37 15 15 — — — Variable lease cost 48 (1) 77 — 4 — Total lease cost $ 368 $ 35 $ 320 $ 6 $ 31 $ 12 2023 Lease cost Operating lease cost (*) $ 252 $ 16 $ 192 $ 5 $ 34 $ 12 Finance lease cost: Amortization of ROU assets 24 2 19 1 — — Interest on lease obligations 14 — 17 — — — Total finance lease cost 38 2 36 1 — — Short-term lease costs 40 16 16 — — — Variable lease cost 47 — 74 — 4 — Total lease cost $ 377 $ 34 $ 318 $ 6 $ 38 $ 12 2022 Lease cost Operating lease cost (*) $ 297 $ 59 $ 198 $ 5 $ 32 $ 15 Finance lease cost: Amortization of ROU assets 23 1 15 1 — — Interest on lease obligations 13 — 17 1 — — Total finance lease cost 36 1 32 2 — — Short-term lease costs 64 44 13 — — — Variable lease cost 125 13 105 — 5 — Sublease income (1) — — — — — Total lease cost $ 521 $ 117 $ 348 $ 7 $ 37 $ 15 (*) Includes operating lease costs related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $108 million, $5 million, and $168 million, respectively, in 2024, $112 million, $4 million, and $174 million, respectively, in 2023, and $162 million, $48 million, and $180 million, respectively, in 2022. Georgia Power has variable lease payments that are based on the amount of energy produced by certain renewable generating facilities subject to PPAs, including $45 million, $42 million, and $45 million in 2024, 2023, and 2022, respectively, from finance leases which are included in purchased power on Georgia Power's statements of income, of which $22 million, $21 million, and $21 million was included in purchased power, affiliates in 2024, 2023, and 2022, respectively. Other information with respect to cash and noncash activities related to leases, as well as weighted-average lease terms and discount rates, is as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) 2024 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 243 $ 19 $ 186 $ 4 $ 33 $ 12 Operating cash flows from finance leases 15 — 21 — — — Financing cash flows from finance leases 11 2 23 1 — — ROU assets obtained under operating leases 146 11 609 — 10 1 Reassessment of ROU assets under operating leases (7) — — — (7) — ROU assets obtained under finance leases 1 — 44 — — — 2023 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 253 $ 17 $ 199 $ 5 $ 33 $ 12 Operating cash flows from finance leases 15 — 22 — — — Financing cash flows from finance leases 18 2 16 1 — — ROU assets obtained under operating leases 100 30 26 1 7 7 ROU assets obtained under finance leases 3 3 18 — — — 2022 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 303 $ 58 $ 206 $ 5 $ 30 $ 14 Operating cash flows from finance leases 11 — 20 1 — — Financing cash flows from finance leases 16 1 10 1 — — ROU assets obtained under operating leases 56 10 17 9 — 3 Reassessment of ROU assets under operating leases 16 — — — 16 — ROU assets obtained under finance leases 118 2 116 — — — Southern Alabama Georgia Mississippi Southern Power Southern Company Gas At December 31, 2024 Weighted-average remaining lease term in years: Operating leases 16.4 10.2 7.9 4.3 32.3 6.8 Finance leases 16.0 2.7 10.1 10.9 N/A N/A Weighted-average discount rate: Operating leases 4.73 % 5.04 % 4.73 % 3.83 % 4.88 % 3.84 % Finance leases 4.86 % 4.05 % 5.8 % 2.74 % N/A N/A At December 31, 2023 Weighted-average remaining lease term in years: Operating leases 17.2 11.1 7.5 4.6 33.1 7.0 Finance leases 16.7 4.3 10.6 11.9 N/A N/A Weighted-average discount rate: Operating leases 4.68 % 5.02 % 4.58 % 3.67 % 4.89 % 3.80 % Finance leases 4.85 % 3.93 % 5.95 % 2.74 % N/A N/A Maturities of lease liabilities are as follows: At December 31, 2024 Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Maturity Analysis Operating leases: 2025 $ 239 $ 18 $ 228 $ 4 $ 31 $ 12 2026 212 15 224 3 29 9 2027 190 12 223 1 29 4 2028 170 9 217 — 29 3 2029 138 7 196 — 30 4 Thereafter 1,255 56 511 1 978 15 Total 2,204 117 1,599 9 1,126 47 Less: Present value discount 751 27 271 1 586 6 Operating lease obligations $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance leases: 2025 $ 28 $ 2 $ 39 $ 2 $ — $ — 2026 27 1 41 2 — — 2027 26 1 41 1 — — 2028 25 — 42 1 — — 2029 25 — 42 1 — — Thereafter 290 — 139 9 — — Total 421 4 344 16 — — Less: Present value discount 134 — 83 2 — — Finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ — Payments made under PPAs at Georgia Power for energy generated from certain renewable energy facilities accounted for as operating and finance leases are considered variable lease costs and are therefore not reflected in the above maturity analysis. At December 31, 2024, Georgia Power has two affiliate PPAs with Southern Power that have not yet commenced and will be accounted for as leases. The PPAs each have a term of 10 years and are expected to commence in 2025 and 2028. The estimated total obligations associated with these PPAs is $83 million. Southern Company Gas has executed an 11.5-year Lessor The Registrants are each considered lessors in various arrangements that have been determined to contain a lease due to the customer's ability to control the use of the underlying asset owned by the applicable Registrant. For the traditional electric operating companies, these arrangements consist of outdoor lighting contracts accounted for as operating leases with initial terms of up to 10 years, after which the contracts renew on a month-to-month basis at the customer's option. For Georgia Power, these arrangements also include PPAs related to electric generating units accounted for as operating leases with remaining terms of up to 15 years. For Mississippi Power, these arrangements also include a tolling arrangement related to an electric generating unit accounted for as a sales-type lease with a remaining term of 14 years. For Southern Power, these arrangements consist of PPAs related to electric generating units accounted for as operating leases with remaining terms of up to 22 years and PPAs related to battery energy storage facilities accounted for as sales-type leases with remaining terms of up to 17 years. Southern Company Gas is the lessor in operating leases related to gas pipelines with remaining terms of up to 18 years. For Southern Company, these arrangements also include PPAs related to fuel cells accounted for as operating leases with remaining terms of up to 9 years. Lease income for 2024, 2023, and 2022, is as follows: Southern Alabama Power Georgia Power Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 15 $ 9 $ — Lease income - operating leases 136 9 28 3 88 36 Variable lease income 417 1 — — 450 — Total lease income $ 577 $ 10 $ 28 $ 18 $ 547 $ 36 2023 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 14 $ 10 $ — Lease income - operating leases 164 35 29 2 85 37 Variable lease income 406 1 — — 437 — Total lease income $ 594 $ 36 $ 29 $ 16 $ 532 $ 37 2022 Lease income - interest income on sales-type leases $ 25 $ — $ — $ 15 $ 10 $ — Lease income - operating leases 208 77 32 2 85 36 Variable lease income 417 1 — — 448 — Total lease income $ 650 $ 78 $ 32 $ 17 $ 543 $ 36 Lease payments received under tolling arrangements and PPAs consist of either scheduled payments or variable payments based on the amount of energy produced by the underlying electric generating units. Lease income related to PPAs is included in wholesale revenues for Alabama Power, Georgia Power, and Southern Power. Scheduled payments to be received under outdoor lighting contracts' initial terms, tolling arrangements, and PPAs accounted for as leases are presented in the following maturity analyses. The undiscounted cash flows expected to be received for in-service leased assets under the leases are as follows: At December 31, 2024 Southern Company Mississippi Power Southern (in millions) 2025 $ 52 $ 24 $ 15 2026 38 23 15 2027 37 22 15 2028 36 21 15 2029 35 20 15 Thereafter 302 132 170 Total undiscounted cash flows $ 500 $ 242 $ 245 Net investment in sales-type lease (*) 297 139 158 Difference between undiscounted cash flows and discounted cash flows $ 203 $ 103 $ 87 (*) For Mississippi Power, included in other current assets ($10 million and $10 million at December 31, 2024 and 2023, respectively) and other property and investments ($129 million and $138 million at December 31, 2024 and 2023, respectively) on the balance sheets. For Southern Power, included in other current assets ($15 million and $15 million at December 31, 2024 and 2023, respectively) and net investment in sales-type leases ($143 million and $148 million at December 31, 2024 and 2023, respectively) on the balance sheets. The undiscounted cash flows to be received under operating leases and contracts accounted for as operating leases are as follows: At December 31, 2024 Southern Alabama Southern Southern Company Gas (in millions) 2025 $ 117 $ 6 $ 142 $ 35 2026 111 5 148 29 2027 109 4 150 28 2028 109 4 161 28 2029 112 3 164 28 Thereafter 621 31 506 326 Total $ 1,179 $ 53 $ 1,271 $ 474 Southern Power receives payments for renewable energy under PPAs accounted for as operating leases that are considered contingent rents and are therefore not reflected in the table above. Alabama Power and Southern Power allocate revenue to the nonlease components of PPAs based on the stand-alone selling price of capacity and energy. The undiscounted cash flows to be received under contracts accounted for as operating leases at Georgia Power and Mississippi Power are immaterial. Southern Company Leveraged Lease At December 31, 2024, a subsidiary of Southern Holdings had one leveraged lease agreement, which relates to energy generation, with an expected remaining term of seven years. Southern Company receives federal income tax deductions for depreciation and amortization, as well as interest on long-term debt, related to this investment. Southern Company wrote off the related investment balance in 2020 following an evaluation of the recoverability of the lease receivable and the expected residual value of the generation assets at the end of the lease. In June 2022, the Southern Holdings subsidiary operating the generating plant for the lessee provided notice to the lessee to terminate the related operating and maintenance agreement effective June 30, 2023. Subsequently, the lessee failed to make the semi-annual lease payment due in December 2022. As a result, the Southern Holdings subsidiary was unable to make its corresponding payment to the holders of the underlying non-recourse debt related to the generation assets. The parties to the lease entered into forbearance agreements which suspended the related contractual rights of the parties while they continued restructuring negotiations, during which the termination date for the operating and maintenance agreement was delayed until July 31, 2023. The negotiations were completed in July 2023, resulting in the Southern Holdings subsidiary agreeing to continue operating the plant for the lessee until the lessee's associated power off-take agreement ends in 2032, subject to certain terms and conditions. The restructuring had no material impact on Southern Company's financial statements. Southern Company will continue to monitor the operational performance of the underlying assets and evaluate the ability of the lessee to continue to meet its obligations, including those associated with a future closure or retirement of the generation assets and associated properties, including the dry ash landfill.
LEASES	LEASES Lessee The Registrants recognize leases with a term of greater than 12 months on the balance sheet as lease obligations, representing the discounted future fixed payments due, along with ROU assets that will be amortized over the term of each lease. As lessee, the Registrants lease certain electric generating units (including renewable energy facilities), real estate/land, communication towers, railcars, and other equipment and vehicles. The major categories of lease obligations are as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) At December 31, 2024 Electric generating units (*) $ 672 $ 56 $ 1,509 $ — $ — $ — Real estate/land 834 3 45 2 540 20 Communication towers 118 2 4 — — 21 Railcars 64 31 29 4 — — Other 52 2 2 16 — — Total $ 1,740 $ 94 $ 1,589 $ 22 $ 540 $ 41 At December 31, 2023 Electric generating units (*) $ 670 $ 58 $ 1,028 $ — $ — $ — Real estate/land 871 4 54 2 546 28 Communication towers 123 1 4 — — 23 Railcars 64 32 27 5 — — Other 60 3 2 18 — — Total $ 1,788 $ 98 $ 1,115 $ 25 $ 546 $ 51 (*) Amounts related to affiliate leases are eliminated in consolidation for Southern Company. See "Contracts that Contain a Lease" herein for additional information. Real estate/land leases primarily consist of commercial real estate leases at Southern Company, Georgia Power, and Southern Company Gas and various land leases primarily associated with renewable energy facilities at Southern Power. The commercial real estate leases have remaining terms of up to 20 years while the land leases have remaining terms of up to 44 years, including renewal periods. Communication towers are leased for the installation of equipment to provide cellular phone service to customers and to support the automated meter infrastructure programs at the traditional electric operating companies and Nicor Gas. Communication tower leases have remaining terms of up to 16 years. Renewal options exist in many of the leases. The expected term used in calculating the lease obligation generally reflects only the noncancelable period of the lease unless it is considered reasonably certain that the lease will be extended. Land leases associated with renewable energy facilities at Southern Power and communication tower leases for automated meter infrastructure at Nicor Gas include renewal periods reasonably certain of exercise resulting in an expected lease term at least equal to the expected life of the renewable energy facilities and the automated meter infrastructure, respectively. Contracts that Contain a Lease While not specifically structured as a lease, some of the PPAs at Alabama Power and Georgia Power are deemed to represent a lease of the underlying electric generating units when the terms of the PPA convey the right to control the use of the underlying assets. Amounts recorded for leases of electric generating units are generally based on the amount of scheduled capacity payments due over the remaining term of the PPA, which varies between three Short-term Leases Leases with an initial term of 12 months or less are not recorded on the balance sheet; the Registrants generally recognize lease expense for these leases on a straight-line basis over the lease term. Residual Value Guarantees Residual value guarantees exist primarily in railcar leases at Alabama Power and Georgia Power, with Georgia Power's railcar leases terminating in June 2024. The amounts probable of being paid under those guarantees are included in the lease payments. All such amounts were immaterial at December 31, 2024 and 2023. Lease and Nonlease Components For all asset categories, with the exception of electric generating units, gas pipelines, and real estate leases, the Registrants combine lease payments and any nonlease components, such as asset maintenance, for purposes of calculating the lease obligation and the ROU asset. Balance sheet amounts recorded for operating and finance leases are as follows: Southern Company Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) At December 31, 2024 Operating Leases Operating lease ROU assets, net $ 1,386 $ 84 $ 1,331 $ 8 $ 484 $ 38 Operating lease obligations - current $ 200 $ 14 $ 169 $ 4 $ 29 $ 11 Operating lease obligations - non-current 1,253 76 1,159 4 511 30 Total operating lease obligations (*) $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance Leases Finance lease ROU assets, net $ 254 $ 4 $ 227 $ 14 $ — $ — Finance lease obligations - current $ 9 $ 1 $ 20 $ 1 $ — $ — Finance lease obligations - non-current 278 3 241 13 — — Total finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ — At December 31, 2023 Operating Leases Operating lease ROU assets, net $ 1,432 $ 87 $ 884 $ 9 $ 488 $ 47 Operating lease obligations - current $ 183 $ 12 $ 135 $ 3 $ 29 $ 11 Operating lease obligations - non-current 1,307 81 740 6 517 40 Total operating lease obligations (*) $ 1,490 $ 93 $ 875 $ 9 $ 546 $ 51 Finance Leases Finance lease ROU assets, net $ 272 $ 5 $ 203 $ 15 $ — $ — Finance lease obligations - current $ 11 $ 2 $ 18 $ 1 $ — $ — Finance lease obligations - non-current 287 3 222 15 — — Total finance lease obligations $ 298 $ 5 $ 240 $ 16 $ — $ — (*) Includes operating lease obligations related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $567 million, $55 million, and $1.3 billion, respectively, at December 31, 2024 and $566 million, $58 million, and $813 million, respectively, at December 31, 2023. If not presented separately on the Registrants' balance sheets, amounts related to leases are presented as follows: operating lease ROU assets, net are included in "other deferred charges and assets"; operating lease obligations are included in "other current liabilities" and "other deferred credits and liabilities," as applicable; finance lease ROU assets, net are included in "plant in service"; and finance lease obligations are included in "securities due within one year" and "long-term debt," as applicable. Lease costs for 2024, 2023, and 2022, which includes both amounts recognized as operations and maintenance expense and amounts capitalized as part of the cost of another asset, are as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease cost Operating lease cost (*) $ 248 $ 19 $ 190 $ 4 $ 27 $ 12 Finance lease cost: Amortization of ROU assets 20 2 23 1 — — Interest on lease obligations 15 — 15 1 — — Total finance lease cost 35 2 38 2 — — Short-term lease costs 37 15 15 — — — Variable lease cost 48 (1) 77 — 4 — Total lease cost $ 368 $ 35 $ 320 $ 6 $ 31 $ 12 2023 Lease cost Operating lease cost (*) $ 252 $ 16 $ 192 $ 5 $ 34 $ 12 Finance lease cost: Amortization of ROU assets 24 2 19 1 — — Interest on lease obligations 14 — 17 — — — Total finance lease cost 38 2 36 1 — — Short-term lease costs 40 16 16 — — — Variable lease cost 47 — 74 — 4 — Total lease cost $ 377 $ 34 $ 318 $ 6 $ 38 $ 12 2022 Lease cost Operating lease cost (*) $ 297 $ 59 $ 198 $ 5 $ 32 $ 15 Finance lease cost: Amortization of ROU assets 23 1 15 1 — — Interest on lease obligations 13 — 17 1 — — Total finance lease cost 36 1 32 2 — — Short-term lease costs 64 44 13 — — — Variable lease cost 125 13 105 — 5 — Sublease income (1) — — — — — Total lease cost $ 521 $ 117 $ 348 $ 7 $ 37 $ 15 (*) Includes operating lease costs related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $108 million, $5 million, and $168 million, respectively, in 2024, $112 million, $4 million, and $174 million, respectively, in 2023, and $162 million, $48 million, and $180 million, respectively, in 2022. Georgia Power has variable lease payments that are based on the amount of energy produced by certain renewable generating facilities subject to PPAs, including $45 million, $42 million, and $45 million in 2024, 2023, and 2022, respectively, from finance leases which are included in purchased power on Georgia Power's statements of income, of which $22 million, $21 million, and $21 million was included in purchased power, affiliates in 2024, 2023, and 2022, respectively. Other information with respect to cash and noncash activities related to leases, as well as weighted-average lease terms and discount rates, is as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) 2024 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 243 $ 19 $ 186 $ 4 $ 33 $ 12 Operating cash flows from finance leases 15 — 21 — — — Financing cash flows from finance leases 11 2 23 1 — — ROU assets obtained under operating leases 146 11 609 — 10 1 Reassessment of ROU assets under operating leases (7) — — — (7) — ROU assets obtained under finance leases 1 — 44 — — — 2023 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 253 $ 17 $ 199 $ 5 $ 33 $ 12 Operating cash flows from finance leases 15 — 22 — — — Financing cash flows from finance leases 18 2 16 1 — — ROU assets obtained under operating leases 100 30 26 1 7 7 ROU assets obtained under finance leases 3 3 18 — — — 2022 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 303 $ 58 $ 206 $ 5 $ 30 $ 14 Operating cash flows from finance leases 11 — 20 1 — — Financing cash flows from finance leases 16 1 10 1 — — ROU assets obtained under operating leases 56 10 17 9 — 3 Reassessment of ROU assets under operating leases 16 — — — 16 — ROU assets obtained under finance leases 118 2 116 — — — Southern Alabama Georgia Mississippi Southern Power Southern Company Gas At December 31, 2024 Weighted-average remaining lease term in years: Operating leases 16.4 10.2 7.9 4.3 32.3 6.8 Finance leases 16.0 2.7 10.1 10.9 N/A N/A Weighted-average discount rate: Operating leases 4.73 % 5.04 % 4.73 % 3.83 % 4.88 % 3.84 % Finance leases 4.86 % 4.05 % 5.8 % 2.74 % N/A N/A At December 31, 2023 Weighted-average remaining lease term in years: Operating leases 17.2 11.1 7.5 4.6 33.1 7.0 Finance leases 16.7 4.3 10.6 11.9 N/A N/A Weighted-average discount rate: Operating leases 4.68 % 5.02 % 4.58 % 3.67 % 4.89 % 3.80 % Finance leases 4.85 % 3.93 % 5.95 % 2.74 % N/A N/A Maturities of lease liabilities are as follows: At December 31, 2024 Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Maturity Analysis Operating leases: 2025 $ 239 $ 18 $ 228 $ 4 $ 31 $ 12 2026 212 15 224 3 29 9 2027 190 12 223 1 29 4 2028 170 9 217 — 29 3 2029 138 7 196 — 30 4 Thereafter 1,255 56 511 1 978 15 Total 2,204 117 1,599 9 1,126 47 Less: Present value discount 751 27 271 1 586 6 Operating lease obligations $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance leases: 2025 $ 28 $ 2 $ 39 $ 2 $ — $ — 2026 27 1 41 2 — — 2027 26 1 41 1 — — 2028 25 — 42 1 — — 2029 25 — 42 1 — — Thereafter 290 — 139 9 — — Total 421 4 344 16 — — Less: Present value discount 134 — 83 2 — — Finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ — Payments made under PPAs at Georgia Power for energy generated from certain renewable energy facilities accounted for as operating and finance leases are considered variable lease costs and are therefore not reflected in the above maturity analysis. At December 31, 2024, Georgia Power has two affiliate PPAs with Southern Power that have not yet commenced and will be accounted for as leases. The PPAs each have a term of 10 years and are expected to commence in 2025 and 2028. The estimated total obligations associated with these PPAs is $83 million. Southern Company Gas has executed an 11.5-year Lessor The Registrants are each considered lessors in various arrangements that have been determined to contain a lease due to the customer's ability to control the use of the underlying asset owned by the applicable Registrant. For the traditional electric operating companies, these arrangements consist of outdoor lighting contracts accounted for as operating leases with initial terms of up to 10 years, after which the contracts renew on a month-to-month basis at the customer's option. For Georgia Power, these arrangements also include PPAs related to electric generating units accounted for as operating leases with remaining terms of up to 15 years. For Mississippi Power, these arrangements also include a tolling arrangement related to an electric generating unit accounted for as a sales-type lease with a remaining term of 14 years. For Southern Power, these arrangements consist of PPAs related to electric generating units accounted for as operating leases with remaining terms of up to 22 years and PPAs related to battery energy storage facilities accounted for as sales-type leases with remaining terms of up to 17 years. Southern Company Gas is the lessor in operating leases related to gas pipelines with remaining terms of up to 18 years. For Southern Company, these arrangements also include PPAs related to fuel cells accounted for as operating leases with remaining terms of up to 9 years. Lease income for 2024, 2023, and 2022, is as follows: Southern Alabama Power Georgia Power Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 15 $ 9 $ — Lease income - operating leases 136 9 28 3 88 36 Variable lease income 417 1 — — 450 — Total lease income $ 577 $ 10 $ 28 $ 18 $ 547 $ 36 2023 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 14 $ 10 $ — Lease income - operating leases 164 35 29 2 85 37 Variable lease income 406 1 — — 437 — Total lease income $ 594 $ 36 $ 29 $ 16 $ 532 $ 37 2022 Lease income - interest income on sales-type leases $ 25 $ — $ — $ 15 $ 10 $ — Lease income - operating leases 208 77 32 2 85 36 Variable lease income 417 1 — — 448 — Total lease income $ 650 $ 78 $ 32 $ 17 $ 543 $ 36 Lease payments received under tolling arrangements and PPAs consist of either scheduled payments or variable payments based on the amount of energy produced by the underlying electric generating units. Lease income related to PPAs is included in wholesale revenues for Alabama Power, Georgia Power, and Southern Power. Scheduled payments to be received under outdoor lighting contracts' initial terms, tolling arrangements, and PPAs accounted for as leases are presented in the following maturity analyses. The undiscounted cash flows expected to be received for in-service leased assets under the leases are as follows: At December 31, 2024 Southern Company Mississippi Power Southern (in millions) 2025 $ 52 $ 24 $ 15 2026 38 23 15 2027 37 22 15 2028 36 21 15 2029 35 20 15 Thereafter 302 132 170 Total undiscounted cash flows $ 500 $ 242 $ 245 Net investment in sales-type lease (*) 297 139 158 Difference between undiscounted cash flows and discounted cash flows $ 203 $ 103 $ 87 (*) For Mississippi Power, included in other current assets ($10 million and $10 million at December 31, 2024 and 2023, respectively) and other property and investments ($129 million and $138 million at December 31, 2024 and 2023, respectively) on the balance sheets. For Southern Power, included in other current assets ($15 million and $15 million at December 31, 2024 and 2023, respectively) and net investment in sales-type leases ($143 million and $148 million at December 31, 2024 and 2023, respectively) on the balance sheets. The undiscounted cash flows to be received under operating leases and contracts accounted for as operating leases are as follows: At December 31, 2024 Southern Alabama Southern Southern Company Gas (in millions) 2025 $ 117 $ 6 $ 142 $ 35 2026 111 5 148 29 2027 109 4 150 28 2028 109 4 161 28 2029 112 3 164 28 Thereafter 621 31 506 326 Total $ 1,179 $ 53 $ 1,271 $ 474 Southern Power receives payments for renewable energy under PPAs accounted for as operating leases that are considered contingent rents and are therefore not reflected in the table above. Alabama Power and Southern Power allocate revenue to the nonlease components of PPAs based on the stand-alone selling price of capacity and energy. The undiscounted cash flows to be received under contracts accounted for as operating leases at Georgia Power and Mississippi Power are immaterial. Southern Company Leveraged Lease At December 31, 2024, a subsidiary of Southern Holdings had one leveraged lease agreement, which relates to energy generation, with an expected remaining term of seven years. Southern Company receives federal income tax deductions for depreciation and amortization, as well as interest on long-term debt, related to this investment. Southern Company wrote off the related investment balance in 2020 following an evaluation of the recoverability of the lease receivable and the expected residual value of the generation assets at the end of the lease. In June 2022, the Southern Holdings subsidiary operating the generating plant for the lessee provided notice to the lessee to terminate the related operating and maintenance agreement effective June 30, 2023. Subsequently, the lessee failed to make the semi-annual lease payment due in December 2022. As a result, the Southern Holdings subsidiary was unable to make its corresponding payment to the holders of the underlying non-recourse debt related to the generation assets. The parties to the lease entered into forbearance agreements which suspended the related contractual rights of the parties while they continued restructuring negotiations, during which the termination date for the operating and maintenance agreement was delayed until July 31, 2023. The negotiations were completed in July 2023, resulting in the Southern Holdings subsidiary agreeing to continue operating the plant for the lessee until the lessee's associated power off-take agreement ends in 2032, subject to certain terms and conditions. The restructuring had no material impact on Southern Company's financial statements. Southern Company will continue to monitor the operational performance of the underlying assets and evaluate the ability of the lessee to continue to meet its obligations, including those associated with a future closure or retirement of the generation assets and associated properties, including the dry ash landfill.
LEASES	LEASES Lessee The Registrants recognize leases with a term of greater than 12 months on the balance sheet as lease obligations, representing the discounted future fixed payments due, along with ROU assets that will be amortized over the term of each lease. As lessee, the Registrants lease certain electric generating units (including renewable energy facilities), real estate/land, communication towers, railcars, and other equipment and vehicles. The major categories of lease obligations are as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) At December 31, 2024 Electric generating units (*) $ 672 $ 56 $ 1,509 $ — $ — $ — Real estate/land 834 3 45 2 540 20 Communication towers 118 2 4 — — 21 Railcars 64 31 29 4 — — Other 52 2 2 16 — — Total $ 1,740 $ 94 $ 1,589 $ 22 $ 540 $ 41 At December 31, 2023 Electric generating units (*) $ 670 $ 58 $ 1,028 $ — $ — $ — Real estate/land 871 4 54 2 546 28 Communication towers 123 1 4 — — 23 Railcars 64 32 27 5 — — Other 60 3 2 18 — — Total $ 1,788 $ 98 $ 1,115 $ 25 $ 546 $ 51 (*) Amounts related to affiliate leases are eliminated in consolidation for Southern Company. See "Contracts that Contain a Lease" herein for additional information. Real estate/land leases primarily consist of commercial real estate leases at Southern Company, Georgia Power, and Southern Company Gas and various land leases primarily associated with renewable energy facilities at Southern Power. The commercial real estate leases have remaining terms of up to 20 years while the land leases have remaining terms of up to 44 years, including renewal periods. Communication towers are leased for the installation of equipment to provide cellular phone service to customers and to support the automated meter infrastructure programs at the traditional electric operating companies and Nicor Gas. Communication tower leases have remaining terms of up to 16 years. Renewal options exist in many of the leases. The expected term used in calculating the lease obligation generally reflects only the noncancelable period of the lease unless it is considered reasonably certain that the lease will be extended. Land leases associated with renewable energy facilities at Southern Power and communication tower leases for automated meter infrastructure at Nicor Gas include renewal periods reasonably certain of exercise resulting in an expected lease term at least equal to the expected life of the renewable energy facilities and the automated meter infrastructure, respectively. Contracts that Contain a Lease While not specifically structured as a lease, some of the PPAs at Alabama Power and Georgia Power are deemed to represent a lease of the underlying electric generating units when the terms of the PPA convey the right to control the use of the underlying assets. Amounts recorded for leases of electric generating units are generally based on the amount of scheduled capacity payments due over the remaining term of the PPA, which varies between three Short-term Leases Leases with an initial term of 12 months or less are not recorded on the balance sheet; the Registrants generally recognize lease expense for these leases on a straight-line basis over the lease term. Residual Value Guarantees Residual value guarantees exist primarily in railcar leases at Alabama Power and Georgia Power, with Georgia Power's railcar leases terminating in June 2024. The amounts probable of being paid under those guarantees are included in the lease payments. All such amounts were immaterial at December 31, 2024 and 2023. Lease and Nonlease Components For all asset categories, with the exception of electric generating units, gas pipelines, and real estate leases, the Registrants combine lease payments and any nonlease components, such as asset maintenance, for purposes of calculating the lease obligation and the ROU asset. Balance sheet amounts recorded for operating and finance leases are as follows: Southern Company Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) At December 31, 2024 Operating Leases Operating lease ROU assets, net $ 1,386 $ 84 $ 1,331 $ 8 $ 484 $ 38 Operating lease obligations - current $ 200 $ 14 $ 169 $ 4 $ 29 $ 11 Operating lease obligations - non-current 1,253 76 1,159 4 511 30 Total operating lease obligations (*) $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance Leases Finance lease ROU assets, net $ 254 $ 4 $ 227 $ 14 $ — $ — Finance lease obligations - current $ 9 $ 1 $ 20 $ 1 $ — $ — Finance lease obligations - non-current 278 3 241 13 — — Total finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ — At December 31, 2023 Operating Leases Operating lease ROU assets, net $ 1,432 $ 87 $ 884 $ 9 $ 488 $ 47 Operating lease obligations - current $ 183 $ 12 $ 135 $ 3 $ 29 $ 11 Operating lease obligations - non-current 1,307 81 740 6 517 40 Total operating lease obligations (*) $ 1,490 $ 93 $ 875 $ 9 $ 546 $ 51 Finance Leases Finance lease ROU assets, net $ 272 $ 5 $ 203 $ 15 $ — $ — Finance lease obligations - current $ 11 $ 2 $ 18 $ 1 $ — $ — Finance lease obligations - non-current 287 3 222 15 — — Total finance lease obligations $ 298 $ 5 $ 240 $ 16 $ — $ — (*) Includes operating lease obligations related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $567 million, $55 million, and $1.3 billion, respectively, at December 31, 2024 and $566 million, $58 million, and $813 million, respectively, at December 31, 2023. If not presented separately on the Registrants' balance sheets, amounts related to leases are presented as follows: operating lease ROU assets, net are included in "other deferred charges and assets"; operating lease obligations are included in "other current liabilities" and "other deferred credits and liabilities," as applicable; finance lease ROU assets, net are included in "plant in service"; and finance lease obligations are included in "securities due within one year" and "long-term debt," as applicable. Lease costs for 2024, 2023, and 2022, which includes both amounts recognized as operations and maintenance expense and amounts capitalized as part of the cost of another asset, are as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease cost Operating lease cost (*) $ 248 $ 19 $ 190 $ 4 $ 27 $ 12 Finance lease cost: Amortization of ROU assets 20 2 23 1 — — Interest on lease obligations 15 — 15 1 — — Total finance lease cost 35 2 38 2 — — Short-term lease costs 37 15 15 — — — Variable lease cost 48 (1) 77 — 4 — Total lease cost $ 368 $ 35 $ 320 $ 6 $ 31 $ 12 2023 Lease cost Operating lease cost (*) $ 252 $ 16 $ 192 $ 5 $ 34 $ 12 Finance lease cost: Amortization of ROU assets 24 2 19 1 — — Interest on lease obligations 14 — 17 — — — Total finance lease cost 38 2 36 1 — — Short-term lease costs 40 16 16 — — — Variable lease cost 47 — 74 — 4 — Total lease cost $ 377 $ 34 $ 318 $ 6 $ 38 $ 12 2022 Lease cost Operating lease cost (*) $ 297 $ 59 $ 198 $ 5 $ 32 $ 15 Finance lease cost: Amortization of ROU assets 23 1 15 1 — — Interest on lease obligations 13 — 17 1 — — Total finance lease cost 36 1 32 2 — — Short-term lease costs 64 44 13 — — — Variable lease cost 125 13 105 — 5 — Sublease income (1) — — — — — Total lease cost $ 521 $ 117 $ 348 $ 7 $ 37 $ 15 (*) Includes operating lease costs related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $108 million, $5 million, and $168 million, respectively, in 2024, $112 million, $4 million, and $174 million, respectively, in 2023, and $162 million, $48 million, and $180 million, respectively, in 2022. Georgia Power has variable lease payments that are based on the amount of energy produced by certain renewable generating facilities subject to PPAs, including $45 million, $42 million, and $45 million in 2024, 2023, and 2022, respectively, from finance leases which are included in purchased power on Georgia Power's statements of income, of which $22 million, $21 million, and $21 million was included in purchased power, affiliates in 2024, 2023, and 2022, respectively. Other information with respect to cash and noncash activities related to leases, as well as weighted-average lease terms and discount rates, is as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) 2024 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 243 $ 19 $ 186 $ 4 $ 33 $ 12 Operating cash flows from finance leases 15 — 21 — — — Financing cash flows from finance leases 11 2 23 1 — — ROU assets obtained under operating leases 146 11 609 — 10 1 Reassessment of ROU assets under operating leases (7) — — — (7) — ROU assets obtained under finance leases 1 — 44 — — — 2023 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 253 $ 17 $ 199 $ 5 $ 33 $ 12 Operating cash flows from finance leases 15 — 22 — — — Financing cash flows from finance leases 18 2 16 1 — — ROU assets obtained under operating leases 100 30 26 1 7 7 ROU assets obtained under finance leases 3 3 18 — — — 2022 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 303 $ 58 $ 206 $ 5 $ 30 $ 14 Operating cash flows from finance leases 11 — 20 1 — — Financing cash flows from finance leases 16 1 10 1 — — ROU assets obtained under operating leases 56 10 17 9 — 3 Reassessment of ROU assets under operating leases 16 — — — 16 — ROU assets obtained under finance leases 118 2 116 — — — Southern Alabama Georgia Mississippi Southern Power Southern Company Gas At December 31, 2024 Weighted-average remaining lease term in years: Operating leases 16.4 10.2 7.9 4.3 32.3 6.8 Finance leases 16.0 2.7 10.1 10.9 N/A N/A Weighted-average discount rate: Operating leases 4.73 % 5.04 % 4.73 % 3.83 % 4.88 % 3.84 % Finance leases 4.86 % 4.05 % 5.8 % 2.74 % N/A N/A At December 31, 2023 Weighted-average remaining lease term in years: Operating leases 17.2 11.1 7.5 4.6 33.1 7.0 Finance leases 16.7 4.3 10.6 11.9 N/A N/A Weighted-average discount rate: Operating leases 4.68 % 5.02 % 4.58 % 3.67 % 4.89 % 3.80 % Finance leases 4.85 % 3.93 % 5.95 % 2.74 % N/A N/A Maturities of lease liabilities are as follows: At December 31, 2024 Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Maturity Analysis Operating leases: 2025 $ 239 $ 18 $ 228 $ 4 $ 31 $ 12 2026 212 15 224 3 29 9 2027 190 12 223 1 29 4 2028 170 9 217 — 29 3 2029 138 7 196 — 30 4 Thereafter 1,255 56 511 1 978 15 Total 2,204 117 1,599 9 1,126 47 Less: Present value discount 751 27 271 1 586 6 Operating lease obligations $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance leases: 2025 $ 28 $ 2 $ 39 $ 2 $ — $ — 2026 27 1 41 2 — — 2027 26 1 41 1 — — 2028 25 — 42 1 — — 2029 25 — 42 1 — — Thereafter 290 — 139 9 — — Total 421 4 344 16 — — Less: Present value discount 134 — 83 2 — — Finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ — Payments made under PPAs at Georgia Power for energy generated from certain renewable energy facilities accounted for as operating and finance leases are considered variable lease costs and are therefore not reflected in the above maturity analysis. At December 31, 2024, Georgia Power has two affiliate PPAs with Southern Power that have not yet commenced and will be accounted for as leases. The PPAs each have a term of 10 years and are expected to commence in 2025 and 2028. The estimated total obligations associated with these PPAs is $83 million. Southern Company Gas has executed an 11.5-year Lessor The Registrants are each considered lessors in various arrangements that have been determined to contain a lease due to the customer's ability to control the use of the underlying asset owned by the applicable Registrant. For the traditional electric operating companies, these arrangements consist of outdoor lighting contracts accounted for as operating leases with initial terms of up to 10 years, after which the contracts renew on a month-to-month basis at the customer's option. For Georgia Power, these arrangements also include PPAs related to electric generating units accounted for as operating leases with remaining terms of up to 15 years. For Mississippi Power, these arrangements also include a tolling arrangement related to an electric generating unit accounted for as a sales-type lease with a remaining term of 14 years. For Southern Power, these arrangements consist of PPAs related to electric generating units accounted for as operating leases with remaining terms of up to 22 years and PPAs related to battery energy storage facilities accounted for as sales-type leases with remaining terms of up to 17 years. Southern Company Gas is the lessor in operating leases related to gas pipelines with remaining terms of up to 18 years. For Southern Company, these arrangements also include PPAs related to fuel cells accounted for as operating leases with remaining terms of up to 9 years. Lease income for 2024, 2023, and 2022, is as follows: Southern Alabama Power Georgia Power Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 15 $ 9 $ — Lease income - operating leases 136 9 28 3 88 36 Variable lease income 417 1 — — 450 — Total lease income $ 577 $ 10 $ 28 $ 18 $ 547 $ 36 2023 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 14 $ 10 $ — Lease income - operating leases 164 35 29 2 85 37 Variable lease income 406 1 — — 437 — Total lease income $ 594 $ 36 $ 29 $ 16 $ 532 $ 37 2022 Lease income - interest income on sales-type leases $ 25 $ — $ — $ 15 $ 10 $ — Lease income - operating leases 208 77 32 2 85 36 Variable lease income 417 1 — — 448 — Total lease income $ 650 $ 78 $ 32 $ 17 $ 543 $ 36 Lease payments received under tolling arrangements and PPAs consist of either scheduled payments or variable payments based on the amount of energy produced by the underlying electric generating units. Lease income related to PPAs is included in wholesale revenues for Alabama Power, Georgia Power, and Southern Power. Scheduled payments to be received under outdoor lighting contracts' initial terms, tolling arrangements, and PPAs accounted for as leases are presented in the following maturity analyses. The undiscounted cash flows expected to be received for in-service leased assets under the leases are as follows: At December 31, 2024 Southern Company Mississippi Power Southern (in millions) 2025 $ 52 $ 24 $ 15 2026 38 23 15 2027 37 22 15 2028 36 21 15 2029 35 20 15 Thereafter 302 132 170 Total undiscounted cash flows $ 500 $ 242 $ 245 Net investment in sales-type lease (*) 297 139 158 Difference between undiscounted cash flows and discounted cash flows $ 203 $ 103 $ 87 (*) For Mississippi Power, included in other current assets ($10 million and $10 million at December 31, 2024 and 2023, respectively) and other property and investments ($129 million and $138 million at December 31, 2024 and 2023, respectively) on the balance sheets. For Southern Power, included in other current assets ($15 million and $15 million at December 31, 2024 and 2023, respectively) and net investment in sales-type leases ($143 million and $148 million at December 31, 2024 and 2023, respectively) on the balance sheets. The undiscounted cash flows to be received under operating leases and contracts accounted for as operating leases are as follows: At December 31, 2024 Southern Alabama Southern Southern Company Gas (in millions) 2025 $ 117 $ 6 $ 142 $ 35 2026 111 5 148 29 2027 109 4 150 28 2028 109 4 161 28 2029 112 3 164 28 Thereafter 621 31 506 326 Total $ 1,179 $ 53 $ 1,271 $ 474 Southern Power receives payments for renewable energy under PPAs accounted for as operating leases that are considered contingent rents and are therefore not reflected in the table above. Alabama Power and Southern Power allocate revenue to the nonlease components of PPAs based on the stand-alone selling price of capacity and energy. The undiscounted cash flows to be received under contracts accounted for as operating leases at Georgia Power and Mississippi Power are immaterial. Southern Company Leveraged Lease At December 31, 2024, a subsidiary of Southern Holdings had one leveraged lease agreement, which relates to energy generation, with an expected remaining term of seven years. Southern Company receives federal income tax deductions for depreciation and amortization, as well as interest on long-term debt, related to this investment. Southern Company wrote off the related investment balance in 2020 following an evaluation of the recoverability of the lease receivable and the expected residual value of the generation assets at the end of the lease. In June 2022, the Southern Holdings subsidiary operating the generating plant for the lessee provided notice to the lessee to terminate the related operating and maintenance agreement effective June 30, 2023. Subsequently, the lessee failed to make the semi-annual lease payment due in December 2022. As a result, the Southern Holdings subsidiary was unable to make its corresponding payment to the holders of the underlying non-recourse debt related to the generation assets. The parties to the lease entered into forbearance agreements which suspended the related contractual rights of the parties while they continued restructuring negotiations, during which the termination date for the operating and maintenance agreement was delayed until July 31, 2023. The negotiations were completed in July 2023, resulting in the Southern Holdings subsidiary agreeing to continue operating the plant for the lessee until the lessee's associated power off-take agreement ends in 2032, subject to certain terms and conditions. The restructuring had no material impact on Southern Company's financial statements. Southern Company will continue to monitor the operational performance of the underlying assets and evaluate the ability of the lessee to continue to meet its obligations, including those associated with a future closure or retirement of the generation assets and associated properties, including the dry ash landfill.
LEASES	LEASES Lessee The Registrants recognize leases with a term of greater than 12 months on the balance sheet as lease obligations, representing the discounted future fixed payments due, along with ROU assets that will be amortized over the term of each lease. As lessee, the Registrants lease certain electric generating units (including renewable energy facilities), real estate/land, communication towers, railcars, and other equipment and vehicles. The major categories of lease obligations are as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) At December 31, 2024 Electric generating units (*) $ 672 $ 56 $ 1,509 $ — $ — $ — Real estate/land 834 3 45 2 540 20 Communication towers 118 2 4 — — 21 Railcars 64 31 29 4 — — Other 52 2 2 16 — — Total $ 1,740 $ 94 $ 1,589 $ 22 $ 540 $ 41 At December 31, 2023 Electric generating units (*) $ 670 $ 58 $ 1,028 $ — $ — $ — Real estate/land 871 4 54 2 546 28 Communication towers 123 1 4 — — 23 Railcars 64 32 27 5 — — Other 60 3 2 18 — — Total $ 1,788 $ 98 $ 1,115 $ 25 $ 546 $ 51 (*) Amounts related to affiliate leases are eliminated in consolidation for Southern Company. See "Contracts that Contain a Lease" herein for additional information. Real estate/land leases primarily consist of commercial real estate leases at Southern Company, Georgia Power, and Southern Company Gas and various land leases primarily associated with renewable energy facilities at Southern Power. The commercial real estate leases have remaining terms of up to 20 years while the land leases have remaining terms of up to 44 years, including renewal periods. Communication towers are leased for the installation of equipment to provide cellular phone service to customers and to support the automated meter infrastructure programs at the traditional electric operating companies and Nicor Gas. Communication tower leases have remaining terms of up to 16 years. Renewal options exist in many of the leases. The expected term used in calculating the lease obligation generally reflects only the noncancelable period of the lease unless it is considered reasonably certain that the lease will be extended. Land leases associated with renewable energy facilities at Southern Power and communication tower leases for automated meter infrastructure at Nicor Gas include renewal periods reasonably certain of exercise resulting in an expected lease term at least equal to the expected life of the renewable energy facilities and the automated meter infrastructure, respectively. Contracts that Contain a Lease While not specifically structured as a lease, some of the PPAs at Alabama Power and Georgia Power are deemed to represent a lease of the underlying electric generating units when the terms of the PPA convey the right to control the use of the underlying assets. Amounts recorded for leases of electric generating units are generally based on the amount of scheduled capacity payments due over the remaining term of the PPA, which varies between three Short-term Leases Leases with an initial term of 12 months or less are not recorded on the balance sheet; the Registrants generally recognize lease expense for these leases on a straight-line basis over the lease term. Residual Value Guarantees Residual value guarantees exist primarily in railcar leases at Alabama Power and Georgia Power, with Georgia Power's railcar leases terminating in June 2024. The amounts probable of being paid under those guarantees are included in the lease payments. All such amounts were immaterial at December 31, 2024 and 2023. Lease and Nonlease Components For all asset categories, with the exception of electric generating units, gas pipelines, and real estate leases, the Registrants combine lease payments and any nonlease components, such as asset maintenance, for purposes of calculating the lease obligation and the ROU asset. Balance sheet amounts recorded for operating and finance leases are as follows: Southern Company Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) At December 31, 2024 Operating Leases Operating lease ROU assets, net $ 1,386 $ 84 $ 1,331 $ 8 $ 484 $ 38 Operating lease obligations - current $ 200 $ 14 $ 169 $ 4 $ 29 $ 11 Operating lease obligations - non-current 1,253 76 1,159 4 511 30 Total operating lease obligations (*) $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance Leases Finance lease ROU assets, net $ 254 $ 4 $ 227 $ 14 $ — $ — Finance lease obligations - current $ 9 $ 1 $ 20 $ 1 $ — $ — Finance lease obligations - non-current 278 3 241 13 — — Total finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ — At December 31, 2023 Operating Leases Operating lease ROU assets, net $ 1,432 $ 87 $ 884 $ 9 $ 488 $ 47 Operating lease obligations - current $ 183 $ 12 $ 135 $ 3 $ 29 $ 11 Operating lease obligations - non-current 1,307 81 740 6 517 40 Total operating lease obligations (*) $ 1,490 $ 93 $ 875 $ 9 $ 546 $ 51 Finance Leases Finance lease ROU assets, net $ 272 $ 5 $ 203 $ 15 $ — $ — Finance lease obligations - current $ 11 $ 2 $ 18 $ 1 $ — $ — Finance lease obligations - non-current 287 3 222 15 — — Total finance lease obligations $ 298 $ 5 $ 240 $ 16 $ — $ — (*) Includes operating lease obligations related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $567 million, $55 million, and $1.3 billion, respectively, at December 31, 2024 and $566 million, $58 million, and $813 million, respectively, at December 31, 2023. If not presented separately on the Registrants' balance sheets, amounts related to leases are presented as follows: operating lease ROU assets, net are included in "other deferred charges and assets"; operating lease obligations are included in "other current liabilities" and "other deferred credits and liabilities," as applicable; finance lease ROU assets, net are included in "plant in service"; and finance lease obligations are included in "securities due within one year" and "long-term debt," as applicable. Lease costs for 2024, 2023, and 2022, which includes both amounts recognized as operations and maintenance expense and amounts capitalized as part of the cost of another asset, are as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease cost Operating lease cost (*) $ 248 $ 19 $ 190 $ 4 $ 27 $ 12 Finance lease cost: Amortization of ROU assets 20 2 23 1 — — Interest on lease obligations 15 — 15 1 — — Total finance lease cost 35 2 38 2 — — Short-term lease costs 37 15 15 — — — Variable lease cost 48 (1) 77 — 4 — Total lease cost $ 368 $ 35 $ 320 $ 6 $ 31 $ 12 2023 Lease cost Operating lease cost (*) $ 252 $ 16 $ 192 $ 5 $ 34 $ 12 Finance lease cost: Amortization of ROU assets 24 2 19 1 — — Interest on lease obligations 14 — 17 — — — Total finance lease cost 38 2 36 1 — — Short-term lease costs 40 16 16 — — — Variable lease cost 47 — 74 — 4 — Total lease cost $ 377 $ 34 $ 318 $ 6 $ 38 $ 12 2022 Lease cost Operating lease cost (*) $ 297 $ 59 $ 198 $ 5 $ 32 $ 15 Finance lease cost: Amortization of ROU assets 23 1 15 1 — — Interest on lease obligations 13 — 17 1 — — Total finance lease cost 36 1 32 2 — — Short-term lease costs 64 44 13 — — — Variable lease cost 125 13 105 — 5 — Sublease income (1) — — — — — Total lease cost $ 521 $ 117 $ 348 $ 7 $ 37 $ 15 (*) Includes operating lease costs related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $108 million, $5 million, and $168 million, respectively, in 2024, $112 million, $4 million, and $174 million, respectively, in 2023, and $162 million, $48 million, and $180 million, respectively, in 2022. Georgia Power has variable lease payments that are based on the amount of energy produced by certain renewable generating facilities subject to PPAs, including $45 million, $42 million, and $45 million in 2024, 2023, and 2022, respectively, from finance leases which are included in purchased power on Georgia Power's statements of income, of which $22 million, $21 million, and $21 million was included in purchased power, affiliates in 2024, 2023, and 2022, respectively. Other information with respect to cash and noncash activities related to leases, as well as weighted-average lease terms and discount rates, is as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) 2024 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 243 $ 19 $ 186 $ 4 $ 33 $ 12 Operating cash flows from finance leases 15 — 21 — — — Financing cash flows from finance leases 11 2 23 1 — — ROU assets obtained under operating leases 146 11 609 — 10 1 Reassessment of ROU assets under operating leases (7) — — — (7) — ROU assets obtained under finance leases 1 — 44 — — — 2023 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 253 $ 17 $ 199 $ 5 $ 33 $ 12 Operating cash flows from finance leases 15 — 22 — — — Financing cash flows from finance leases 18 2 16 1 — — ROU assets obtained under operating leases 100 30 26 1 7 7 ROU assets obtained under finance leases 3 3 18 — — — 2022 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 303 $ 58 $ 206 $ 5 $ 30 $ 14 Operating cash flows from finance leases 11 — 20 1 — — Financing cash flows from finance leases 16 1 10 1 — — ROU assets obtained under operating leases 56 10 17 9 — 3 Reassessment of ROU assets under operating leases 16 — — — 16 — ROU assets obtained under finance leases 118 2 116 — — — Southern Alabama Georgia Mississippi Southern Power Southern Company Gas At December 31, 2024 Weighted-average remaining lease term in years: Operating leases 16.4 10.2 7.9 4.3 32.3 6.8 Finance leases 16.0 2.7 10.1 10.9 N/A N/A Weighted-average discount rate: Operating leases 4.73 % 5.04 % 4.73 % 3.83 % 4.88 % 3.84 % Finance leases 4.86 % 4.05 % 5.8 % 2.74 % N/A N/A At December 31, 2023 Weighted-average remaining lease term in years: Operating leases 17.2 11.1 7.5 4.6 33.1 7.0 Finance leases 16.7 4.3 10.6 11.9 N/A N/A Weighted-average discount rate: Operating leases 4.68 % 5.02 % 4.58 % 3.67 % 4.89 % 3.80 % Finance leases 4.85 % 3.93 % 5.95 % 2.74 % N/A N/A Maturities of lease liabilities are as follows: At December 31, 2024 Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Maturity Analysis Operating leases: 2025 $ 239 $ 18 $ 228 $ 4 $ 31 $ 12 2026 212 15 224 3 29 9 2027 190 12 223 1 29 4 2028 170 9 217 — 29 3 2029 138 7 196 — 30 4 Thereafter 1,255 56 511 1 978 15 Total 2,204 117 1,599 9 1,126 47 Less: Present value discount 751 27 271 1 586 6 Operating lease obligations $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance leases: 2025 $ 28 $ 2 $ 39 $ 2 $ — $ — 2026 27 1 41 2 — — 2027 26 1 41 1 — — 2028 25 — 42 1 — — 2029 25 — 42 1 — — Thereafter 290 — 139 9 — — Total 421 4 344 16 — — Less: Present value discount 134 — 83 2 — — Finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ — Payments made under PPAs at Georgia Power for energy generated from certain renewable energy facilities accounted for as operating and finance leases are considered variable lease costs and are therefore not reflected in the above maturity analysis. At December 31, 2024, Georgia Power has two affiliate PPAs with Southern Power that have not yet commenced and will be accounted for as leases. The PPAs each have a term of 10 years and are expected to commence in 2025 and 2028. The estimated total obligations associated with these PPAs is $83 million. Southern Company Gas has executed an 11.5-year Lessor The Registrants are each considered lessors in various arrangements that have been determined to contain a lease due to the customer's ability to control the use of the underlying asset owned by the applicable Registrant. For the traditional electric operating companies, these arrangements consist of outdoor lighting contracts accounted for as operating leases with initial terms of up to 10 years, after which the contracts renew on a month-to-month basis at the customer's option. For Georgia Power, these arrangements also include PPAs related to electric generating units accounted for as operating leases with remaining terms of up to 15 years. For Mississippi Power, these arrangements also include a tolling arrangement related to an electric generating unit accounted for as a sales-type lease with a remaining term of 14 years. For Southern Power, these arrangements consist of PPAs related to electric generating units accounted for as operating leases with remaining terms of up to 22 years and PPAs related to battery energy storage facilities accounted for as sales-type leases with remaining terms of up to 17 years. Southern Company Gas is the lessor in operating leases related to gas pipelines with remaining terms of up to 18 years. For Southern Company, these arrangements also include PPAs related to fuel cells accounted for as operating leases with remaining terms of up to 9 years. Lease income for 2024, 2023, and 2022, is as follows: Southern Alabama Power Georgia Power Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 15 $ 9 $ — Lease income - operating leases 136 9 28 3 88 36 Variable lease income 417 1 — — 450 — Total lease income $ 577 $ 10 $ 28 $ 18 $ 547 $ 36 2023 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 14 $ 10 $ — Lease income - operating leases 164 35 29 2 85 37 Variable lease income 406 1 — — 437 — Total lease income $ 594 $ 36 $ 29 $ 16 $ 532 $ 37 2022 Lease income - interest income on sales-type leases $ 25 $ — $ — $ 15 $ 10 $ — Lease income - operating leases 208 77 32 2 85 36 Variable lease income 417 1 — — 448 — Total lease income $ 650 $ 78 $ 32 $ 17 $ 543 $ 36 Lease payments received under tolling arrangements and PPAs consist of either scheduled payments or variable payments based on the amount of energy produced by the underlying electric generating units. Lease income related to PPAs is included in wholesale revenues for Alabama Power, Georgia Power, and Southern Power. Scheduled payments to be received under outdoor lighting contracts' initial terms, tolling arrangements, and PPAs accounted for as leases are presented in the following maturity analyses. The undiscounted cash flows expected to be received for in-service leased assets under the leases are as follows: At December 31, 2024 Southern Company Mississippi Power Southern (in millions) 2025 $ 52 $ 24 $ 15 2026 38 23 15 2027 37 22 15 2028 36 21 15 2029 35 20 15 Thereafter 302 132 170 Total undiscounted cash flows $ 500 $ 242 $ 245 Net investment in sales-type lease (*) 297 139 158 Difference between undiscounted cash flows and discounted cash flows $ 203 $ 103 $ 87 (*) For Mississippi Power, included in other current assets ($10 million and $10 million at December 31, 2024 and 2023, respectively) and other property and investments ($129 million and $138 million at December 31, 2024 and 2023, respectively) on the balance sheets. For Southern Power, included in other current assets ($15 million and $15 million at December 31, 2024 and 2023, respectively) and net investment in sales-type leases ($143 million and $148 million at December 31, 2024 and 2023, respectively) on the balance sheets. The undiscounted cash flows to be received under operating leases and contracts accounted for as operating leases are as follows: At December 31, 2024 Southern Alabama Southern Southern Company Gas (in millions) 2025 $ 117 $ 6 $ 142 $ 35 2026 111 5 148 29 2027 109 4 150 28 2028 109 4 161 28 2029 112 3 164 28 Thereafter 621 31 506 326 Total $ 1,179 $ 53 $ 1,271 $ 474 Southern Power receives payments for renewable energy under PPAs accounted for as operating leases that are considered contingent rents and are therefore not reflected in the table above. Alabama Power and Southern Power allocate revenue to the nonlease components of PPAs based on the stand-alone selling price of capacity and energy. The undiscounted cash flows to be received under contracts accounted for as operating leases at Georgia Power and Mississippi Power are immaterial. Southern Company Leveraged Lease At December 31, 2024, a subsidiary of Southern Holdings had one leveraged lease agreement, which relates to energy generation, with an expected remaining term of seven years. Southern Company receives federal income tax deductions for depreciation and amortization, as well as interest on long-term debt, related to this investment. Southern Company wrote off the related investment balance in 2020 following an evaluation of the recoverability of the lease receivable and the expected residual value of the generation assets at the end of the lease. In June 2022, the Southern Holdings subsidiary operating the generating plant for the lessee provided notice to the lessee to terminate the related operating and maintenance agreement effective June 30, 2023. Subsequently, the lessee failed to make the semi-annual lease payment due in December 2022. As a result, the Southern Holdings subsidiary was unable to make its corresponding payment to the holders of the underlying non-recourse debt related to the generation assets. The parties to the lease entered into forbearance agreements which suspended the related contractual rights of the parties while they continued restructuring negotiations, during which the termination date for the operating and maintenance agreement was delayed until July 31, 2023. The negotiations were completed in July 2023, resulting in the Southern Holdings subsidiary agreeing to continue operating the plant for the lessee until the lessee's associated power off-take agreement ends in 2032, subject to certain terms and conditions. The restructuring had no material impact on Southern Company's financial statements. Southern Company will continue to monitor the operational performance of the underlying assets and evaluate the ability of the lessee to continue to meet its obligations, including those associated with a future closure or retirement of the generation assets and associated properties, including the dry ash landfill.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES Southern Company files a consolidated federal income tax return and the Registrants file various state income tax returns, some of which are combined or unitary. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis, and each subsidiary is allocated an amount of tax similar to that which would be paid if it filed a separate income tax return except for certain credit utilization and state apportionment results. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability. Current and Deferred Income Taxes Details of income tax provisions are as follows: 2024 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Federal — Current $ 221 $ 357 $ 200 $ 32 $ (112) $ 84 Deferred 387 (111) 211 2 106 86 Total federal 608 246 411 34 (6) 170 State — Current 152 103 52 (1) 6 42 Deferred 209 11 140 14 (13) 46 Total state 361 114 192 13 (7) 88 Total $ 969 $ 360 $ 603 $ 47 $ (13) $ 258 2023 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Federal — Current $ 54 $ 242 $ 205 $ 49 $ (320) $ 62 Deferred 299 (257) 195 (26) 334 68 Total federal 353 (15) 400 23 14 130 State — Current 41 82 37 1 (1) 24 Deferred 102 14 11 12 (1) 57 Total state 143 96 48 13 (2) 81 Total $ 496 $ 81 $ 448 $ 36 $ 12 $ 211 2022 Southern Company Alabama Power Georgia Mississippi Southern Power Southern Company Gas (in millions) Federal — Current $ 10 $ 54 $ 38 $ 42 $ (43) $ 122 Deferred 455 259 152 (16) 56 (3) Total federal 465 313 190 26 13 119 State — Current 27 14 (21) — 2 42 Deferred 303 96 201 11 5 19 Total state 330 110 180 11 7 61 Total $ 795 $ 423 $ 370 $ 37 $ 20 $ 180 Southern Company's and Southern Power's ITCs and PTCs generated in the current tax year and carried forward from prior tax years that cannot be utilized or transferred in the current tax year are reclassified from current to deferred taxes in federal income tax expense in the tables above. Southern Power's ITCs and PTCs reclassified in this manner were immaterial in 2024 and 2023 and $17 million in 2022. Southern Power received $71 million, $332 million, and $49 million of cash related to federal ITCs under renewable energy initiatives in 2024, 2023, and 2022, respectively. See "Deferred Tax Assets and Liabilities" herein for additional information. In accordance with regulatory requirements, deferred federal ITCs for the traditional electric operating companies are amortized over the average life of the related property, with such amortization normally applied as a credit to reduce depreciation and amortization in the statements of income. Southern Power's and the natural gas distribution utilities' deferred federal ITCs, as well as certain state ITCs for Nicor Gas, are amortized to income tax expense over the life of the respective asset. ITCs amortized in 2024, 2023, and 2022 were immaterial for the traditional electric operating companies and Southern Company Gas and were as follows for Southern Company and Southern Power: Southern Company Southern Power (in millions) 2024 $ 109 $ 58 2023 84 58 2022 83 58 When Southern Power recognizes tax credits, the tax basis of the asset is reduced by 50% of the ITCs received, which, together with the deferred credit, results in a net deferred tax asset. Southern Power has elected to recognize the tax benefit of this basis difference as a reduction to income tax expense in the year in which the plant reaches commercial operation. State ITCs and other state credits, which are recognized in the period in which the credits are generated, reduced Georgia Power's income tax expense by $44 million in 2024, $49 million in 2023, and $53 million in 2022. Southern Power's federal and state PTCs, which are recognized in the period in which the credits are generated, reduced Southern Power's income tax expense by $32 million in 2024, $26 million in 2023, and $27 million in 2022. In 2024, Alabama Power, Georgia Power, and Southern Power entered into transferability agreements with non-affiliated parties to sell ITCs and PTCs at a discount to the generated credit value in 2024, 2025, and 2026. Georgia Power and Southern Power received cash of $11 million and $24 million, respectively, from credits transferred during the year. The discount will be recorded as a reduction in tax credits recognized in the financial statements. The Southern Company system continues to explore the ability to efficiently monetize its tax credits through third-party transferability agreements. Pursuant to the Vogtle Joint Ownership Agreements, Georgia Power paid $131 million in 2024 and $39 million in 2023 to the other Vogtle Owners for advanced nuclear PTCs for Plant Vogtle Unit 3 and 4, which were utilized and not reflected as a reduction to current income tax expense. The gains recognized in both periods were recorded in income tax benefit and were immaterial. Effective Tax Rate Southern Company's effective tax rate is typically lower than the statutory rate due to employee stock plans' dividend deduction, non-taxable AFUDC equity at the traditional electric operating companies, flowback of excess deferred income taxes at the regulated utilities, and federal income tax benefits from ITCs and PTCs primarily at Southern Power, Georgia Power, and Alabama Power. A reconciliation of the federal statutory income tax rate to the effective income tax (benefit) rate is as follows: 2024 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas Federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % State income tax, net of federal deduction 3.6 5.0 1.7 4.4 (2.3) 7.0 Changes in valuation allowance, net of federal benefit 1.9 — 3.1 — — — Employee stock plans' dividend deduction (0.4) — — — — — Non-deductible book depreciation 0.6 0.6 0.7 0.3 — — Flowback of excess deferred income taxes (3.9) (5.3) (2.2) (6.5) — (2.2) AFUDC-Equity (0.8) (0.7) (1.0) — — — Federal PTCs (2.8) (0.1) (3.7) — (17.2) — ITC amortization (1.2) (0.1) (0.2) — (26.4) — Noncontrolling interests 0.6 — — — 17.1 — Other (0.1) — (0.2) — 0.2 — Effective income tax (benefit) rate 18.5 % 20.4 % 19.2 % 19.2 % (7.6) % 25.8 % 2023 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas Federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % State income tax, net of federal deduction 2.9 5.2 2.1 4.9 (0.7) 7.8 Changes in valuation allowance, net of federal benefit (0.3) — (0.6) — — — Employee stock plans' dividend deduction (0.5) — — — — — Non-deductible book depreciation 0.7 0.7 0.8 0.4 — — Flowback of excess deferred income taxes (9.2) (19.8) (2.6) (10.2) — (2.6) AFUDC-Equity (1.1) (1.2) (1.2) — — — Federal PTCs (1.2) — (1.4) — (7.4) — ITC amortization (1.3) (0.1) (0.1) — (19.0) — Noncontrolling interests 0.6 — — — 11.1 — Other (0.2) (0.2) (0.3) 0.1 0.1 (0.6) Effective income tax rate 11.4 % 5.6 % 17.7 % 16.2 % 5.1 % 25.6 % 2022 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas Federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % State income tax, net of federal deduction 7.8 4.8 3.3 4.4 1.9 6.4 Changes in valuation allowance, net of federal benefit (1.6) — 3.2 — — — Employee stock plans' dividend deduction (0.5) — — — — — Non-deductible book depreciation 0.6 0.5 0.6 0.3 — — Flowback of excess deferred income taxes (6.6) (1.9) (9.6) (7.8) — (2.5) AFUDC-Equity (1.1) (0.8) (1.5) — — — Federal PTCs — — — — (6.6) — ITC amortization (1.3) (0.1) (0.1) — (17.2) (0.1) Noncontrolling interests 0.5 — — — 8.4 — Other — 0.3 — 0.3 (0.1) (0.9) Effective income tax rate 18.8 % 23.8 % 16.9 % 18.2 % 7.4 % 23.9 % Deferred Tax Assets and Liabilities The tax effects of temporary differences between the carrying amounts of assets and liabilities in the financial statements of the Registrants and their respective tax bases, which give rise to deferred tax assets and liabilities, are as follows: December 31, 2024 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Deferred tax liabilities — Accelerated depreciation $ 9,828 $ 2,583 $ 3,810 $ 344 $ 1,309 $ 1,575 Property basis differences 3,025 1,497 918 192 — 412 Employee benefit obligations 1,067 362 470 54 13 60 AROs 727 458 221 — — — Under recovered fuel and natural gas costs 318 13 305 — — — Regulatory assets – AROs 1,886 658 1,193 35 — — Employee benefit obligations 746 191 237 35 — 35 Remaining book value of retired assets 360 168 187 5 — — Storm damage reserves 216 — 216 — — — Premium on reacquired debt 57 8 48 1 — — Other 678 171 187 61 1 201 Total deferred income tax liabilities 18,908 6,109 7,792 727 1,323 2,283 Deferred tax assets — AROs 2,613 1,116 1,414 35 — — CAMT carryforwards 40 — 18 — — 104 ITC and PTC carryforwards 1,380 48 719 — 384 — Employee benefit obligations 897 196 279 49 16 87 Estimated loss on plants under construction 773 — 773 — — — Estimated loss on regulatory disallowance 20 — — — — 20 Other state deferred tax attributes 366 — 26 224 49 16 Federal effect of net state deferred tax liabilities 402 197 100 — 23 107 Other property basis differences 176 — 75 — 85 — State effect of federal deferred taxes 126 126 — — — — Other partnership basis differences 60 — — — 60 — Regulatory liability associated with the Tax Reform Legislation (not subject to normalization) 18 18 — — — — Long-term debt fair value adjustment 73 — — — — 73 Other comprehensive losses 48 3 — — 1 — Other 601 227 160 50 20 86 Total deferred income tax assets 7,593 1,931 3,564 358 638 493 Valuation allowance (333) — (157) (41) (27) (6) Net deferred income tax assets 7,260 1,931 3,407 317 611 487 Net deferred income taxes (assets)/liabilities $ 11,648 $ 4,178 $ 4,385 $ 410 $ 712 $ 1,796 Recognized in the balance sheets: Accumulated deferred income taxes – assets $ (82) $ — $ — $ (82) $ — $ — Accumulated deferred income taxes – liabilities $ 11,730 $ 4,178 $ 4,385 $ 492 $ 712 $ 1,796 December 31, 2023 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Deferred tax liabilities — Accelerated depreciation $ 9,683 $ 2,566 $ 3,628 $ 339 $ 1,346 $ 1,576 Property basis differences 2,647 1,444 812 188 — 189 Employee benefit obligations 979 321 446 49 12 74 AROs 833 476 314 — — — Under recovered fuel and natural gas costs 601 80 508 13 — — Regulatory assets – AROs 1,902 667 1,196 39 — — Employee benefit obligations 797 213 260 37 — 11 Remaining book value of retired assets 369 143 221 5 — — Premium on reacquired debt 63 9 53 1 — — Other 700 182 223 43 2 191 Total deferred income tax liabilities 18,574 6,101 7,661 714 1,360 2,041 Deferred tax assets — AROs 2,735 1,143 1,510 39 — — ITC and PTC carryforwards 1,387 12 691 — 481 — Employee benefit obligations 985 224 316 52 10 89 Estimated loss on plants under construction 857 — 857 — — — Estimated loss on regulatory disallowance 26 — — — — 26 Other state deferred tax attributes 363 — 13 231 49 8 Federal effect of net state deferred tax liabilities 418 215 92 — 27 101 Other property basis differences 197 — 83 — 97 — State effect of federal deferred taxes 115 115 — — — — Other partnership basis differences 85 — — — 85 — Regulatory liability associated with the Tax Reform Legislation (not subject to normalization) 34 30 — 3 — — Long-term debt fair value adjustment 79 — — — — 79 Other comprehensive losses 67 4 4 — 6 — Other 538 188 152 57 18 74 Total deferred income tax assets 7,886 1,931 3,718 382 773 377 Valuation allowance (206) — (75) (41) (27) (7) Net deferred income tax assets 7,680 1,931 3,643 341 746 370 Net deferred income taxes (assets)/liabilities $ 10,894 $ 4,170 $ 4,018 $ 373 $ 614 $ 1,671 Recognized in the balance sheets: Accumulated deferred income taxes – assets $ (96) $ — $ — $ (96) $ — $ — Accumulated deferred income taxes – liabilities $ 10,990 $ 4,170 $ 4,018 $ 469 $ 614 $ 1,671 The traditional electric operating companies and the natural gas distribution utilities have tax-related regulatory assets (deferred income tax charges) and regulatory liabilities (deferred income tax credits). The regulatory assets are primarily attributable to tax benefits flowed through to customers in prior years, deferred taxes previously recognized at rates lower than the current enacted tax law, and taxes applicable to capitalized interest. The regulatory liabilities are primarily attributable to deferred taxes previously recognized at rates higher than the current enacted tax law and to unamortized ITCs. See Note 2 for each Registrant's related balances at December 31, 2024 and 2023. Tax Credit Carryforwards Federal ITC/PTC carryforwards at December 31, 2024 were as follows: Southern Company Alabama Georgia Southern (in millions) Federal ITC/PTC carryforwards $ 765 $ 48 $ 147 $ 384 Tax year in which federal ITC/PTC carryforwards begin expiring 2031 2032 2031 2035 Year by which federal ITC/PTC carryforwards are expected to be utilized 2028 2028 2028 2028 The estimated tax credit utilization reflects the various transactions described in Note 15 and could be impacted by numerous factors, including the acquisition or construction of additional renewable projects, changes in taxable income projections, transfer of eligible credits, potential income tax rate changes, and remaining final guidance on the IRA. In the third quarter 2023 and the second quarter 2024, Georgia Power started generating advanced nuclear PTCs for Plant Vogtle Units 3 and 4, respectively, beginning on each unit's respective in-service date. In addition, pursuant to the Vogtle Joint Ownership Agreements, Georgia Power is purchasing advanced nuclear PTCs for Plant Vogtle Unit 3 and 4 from the other Vogtle Owners. See Note 2 under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4. At December 31, 2024, Southern Company and Georgia Power also had approximately $515 million and $472 million, respectively, in net state investment and other net state tax credit carryforwards for the State of Georgia that will expire between tax years 2024 and 2033 and are not expected to be fully utilized. Southern Company and Georgia Power have a net state valuation allowance of $161 million and $124 million, respectively, associated with these carryforwards, which increased during 2024 by $101 million and $64 million, respectively. At December 31, 2024, Southern Company and certain subsidiaries also had approximately $40 million in net CAMT carryforwards that have an indefinite carryforward period and are expected to be fully utilized by 2031. The ultimate outcome of these matters cannot be determined at this time. Net Operating Loss Carryforwards At December 31, 2024, the net state income tax benefit of state and local NOL carryforwards and associated valuation allowances for Southern Company's subsidiaries were as follows: Company/Jurisdiction Approximate Net State Income Tax Benefit of NOL Carryforwards Tax Year NOL Net State Valuation Allowance for NOL Carryforwards (in millions) (in millions) Mississippi Power Mississippi $ 178 2032 $ (32) Southern Power Oklahoma $ 26 2035 $ (11) Florida 10 2034 (10) Other states 2 2034 — Southern Power Total $ 38 $ (21) Other (*) New York $ 11 2036 $ (11) New York City 14 2036 (14) Other states 24 2025 (4) Southern Company Total $ 265 $ (82) (*) Represents other non-registrant Southern Company subsidiaries. Alabama Power, Georgia Power, and Southern Company Gas did not have material state or local NOL carryforwards at December 31, 2024. Certain state NOLs are not expected to be fully utilized prior to expiration. The ultimate outcome of these matters cannot be determined at this time. Unrecognized Tax Benefits Changes in unrecognized tax benefits for the periods presented were as follows: Southern Company Georgia Power Southern (in millions) Unrecognized tax benefits at December 31, 2021 $ 47 $ — $ — Tax positions changes — Increase from prior periods 33 — 32 Unrecognized tax benefits at December 31, 2022 80 — 32 Tax positions changes — Increase from prior periods 88 86 2 Statute of limitations expiration (52) (9) — Unrecognized tax benefits at December 31, 2023 116 77 34 Tax positions changes — Increase from prior periods 10 — 10 Decrease from prior periods (44) (43) — Unrecognized tax benefits at December 31, 2024 $ 82 $ 34 $ 44 The unrecognized tax positions increase from prior periods for 2022 is primarily related to the amendment of certain 2018 state tax filing positions related to Southern Company Gas dispositions. If accepted by the states, these positions would decrease Southern Company's and Southern Company Gas' annual effective tax rates. The ultimate outcome of these unrecognized tax benefits is dependent on acceptance by each state and is not expected to be resolved within the next 12 months. The unrecognized tax positions increase from prior periods for 2023 is primarily related to the amendment of certain 2019 through 2021 state tax filing positions related to tax credit utilization, a portion of which decreased in the fourth quarter 2023 due to a statute of limitations expiration. If effective settlement of the positions is favorable, these positions would decrease Southern Company's and Georgia Power's annual effective tax rates. The ultimate outcome of this unrecognized tax benefit, which is expected to be resolved within the next 12 months, is dependent on acceptance by the state or expiration of related statute of limitations. The unrecognized tax positions reductions due to statute of limitations expiration for 2023 primarily relate to a 2019 state tax filing position to exclude certain gains from 2019 dispositions from taxation in a certain unitary state. This tax position and related interest was recognized in the fourth quarter 2023 and decreased Southern Company's annual effective tax rate. The unrecognized tax positions increase from prior periods for 2024 is primarily related to a certain state tax filing position at Southern Company Gas. If effective settlement of this position is favorable, this position would decrease Southern Company's and Southern Company Gas' annual effective tax rates. The ultimate outcome is dependent on acceptance by the state. The unrecognized tax positions decrease from prior periods for 2024 is primarily related to the 2019 and 2020 amended state filing positions related to tax credit utilization at Georgia Power. All of the Registrants classify interest on tax uncertainties as interest expense. Accrued interest for all tax positions was immaterial for all years presented. None of the Registrants accrued any penalties on uncertain tax positions. The IRS has finalized its audits of Southern Company's consolidated federal income tax returns through 2023. Southern Company is a participant in the Compliance Assurance Process of the IRS. The IRS selected six Southern Power partnership returns for exam for the 2020 and 2021 tax years. One audit for 2021 is still under review, and the remaining audits have been closed with no change. The ultimate outcome of this matter cannot be determined at this time. The audits for the Registrants' state income tax returns have either been concluded, or the statute of limitations has expired, for years prior to 2018.

RETIREMENT BENEFITS

RETIREMENT BENEFITS	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
RETIREMENT BENEFITS	RETIREMENT BENEFITS The Southern Company system has a qualified defined benefit, trusteed pension plan covering substantially all employees, with the exception of PowerSecure employees. The qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). No contributions to the qualified pension plan were made for the year ended December 31, 2024 and no mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2025. The Southern Company system also provides certain non-qualified defined benefits for a select group of management and highly compensated employees, which are funded on a cash basis. In addition, the Southern Company system provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans. The traditional electric operating companies fund other postretirement trusts to the extent required by their respective regulatory commissions. Southern Company Gas has a separate unfunded supplemental retirement health care plan that provides medical care and life insurance benefits to employees of discontinued businesses. For the year ending December 31, 2025, no contributions to any other postretirement trusts are expected. Actuarial Assumptions The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and other postretirement benefit plans for the following year and the benefit obligations as of the measurement date are presented below. 2024 Assumptions used to determine net Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas Pension plans Discount rate – benefit obligations 5.07 % 5.08 % 5.06 % 5.06 % 5.14 % 5.05 % Discount rate – interest costs 4.94 4.94 4.94 4.93 5.01 4.93 Discount rate – service costs 5.19 5.20 5.21 5.19 5.20 5.13 Expected long-term return on plan assets 8.30 8.30 8.30 8.30 8.30 8.30 Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 Other postretirement benefit plans Discount rate – benefit obligations 4.99 % 5.01 % 4.98 % 4.98 % 5.06 % 4.98 % Discount rate – interest costs 4.90 4.90 4.89 4.90 4.94 4.89 Discount rate – service costs 5.16 5.17 5.16 5.16 5.14 5.16 Expected long-term return on plan assets 7.67 7.97 7.59 7.43 — 6.36 Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 2023 Assumptions used to determine net Southern Company Alabama Georgia Mississippi Power Southern Power Southern Company Gas Pension plans Discount rate – benefit obligations 5.25 % 5.26 % 5.25 % 5.25 % 5.31 % 5.24 % Discount rate – interest costs 5.13 5.14 5.12 5.12 5.19 5.12 Discount rate – service costs 5.36 5.38 5.38 5.37 5.37 5.31 Expected long-term return on plan assets 8.40 8.40 8.40 8.40 8.40 8.40 Annual salary increase 4.80 4.80 4.80 4.80 4.80 4.80 Other postretirement benefit plans Discount rate – benefit obligations 5.18 % 5.20 % 5.17 % 5.17 % 5.24 % 5.16 % Discount rate – interest costs 5.08 5.09 5.07 5.08 5.12 5.07 Discount rate – service costs 5.34 5.35 5.34 5.33 5.33 5.33 Expected long-term return on plan assets 7.67 7.95 7.49 7.43 — 6.59 Annual salary increase 4.80 4.80 4.80 4.80 4.80 4.80 2022 Assumptions used to determine net periodic costs: Southern Company Alabama Georgia Mississippi Power Southern Power Southern Company Gas Pension plans Discount rate – benefit obligations 3.09 % 3.12 % 3.07 % 3.07 % 3.21 % 3.04 % Discount rate – interest costs 2.55 2.58 2.51 2.54 2.79 2.53 Discount rate – service costs 3.34 3.36 3.37 3.35 3.36 3.21 Expected long-term return on plan assets 8.25 8.25 8.25 8.25 8.25 8.25 Annual salary increase 4.80 4.80 4.80 4.80 4.80 4.80 Other postretirement benefit plans Discount rate – benefit obligations 2.90 % 2.95 % 2.87 % 2.88 % 3.07 % 2.82 % Discount rate – interest costs 2.32 2.38 2.30 2.27 2.55 2.17 Discount rate – service costs 3.26 3.30 3.27 3.26 3.25 3.22 Expected long-term return on plan assets 7.21 7.54 6.88 7.22 — 6.08 Annual salary increase 4.80 4.80 4.80 4.80 4.80 4.80 2024 Assumptions used to determine benefit obligations: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas Pension plans Discount rate 5.76 % 5.78 % 5.75 % 5.76 % 5.84 % 5.73 % Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 Other postretirement benefit plans Discount rate 5.64 % 5.67 % 5.61 % 5.63 % 5.73 % 5.62 % Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 2023 Assumptions used to determine benefit obligations: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas Pension plans Discount rate 5.07 % 5.08 % 5.06 % 5.06 % 5.14 % 5.05 % Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 Other postretirement benefit plans Discount rate 4.99 % 5.01 % 4.98 % 4.98 % 5.06 % 4.98 % Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 The Registrants estimate the expected rate of return on pension plan and other postretirement benefit plan assets using a financial model to project the expected return on each current investment portfolio. The analysis projects an expected rate of return on each of the different asset classes in order to arrive at the expected return on the entire portfolio relying on each trust's target asset allocation and reasonable capital market assumptions. The financial model is based on four key inputs: anticipated returns by asset class (based in part on historical returns), each trust's target asset allocation, an anticipated inflation rate, and the projected impact of a periodic rebalancing of each trust's portfolio. The Registrants set the expected rate of return assumption using an arithmetic mean which represents the expected simple average return to be earned by the pension plan assets over any one year. The Registrants believe the use of the arithmetic mean is more compatible with the expected rate of return's function of estimating a single year's investment return. An additional assumption used in measuring the accumulated other postretirement benefit obligations (APBO) was a weighted average medical care cost trend rate. The weighted average medical care cost trend rates used in measuring the APBO for the Registrants at December 31, 2024 were as follows: Initial Cost Trend Rate Ultimate Cost Trend Rate Year That Ultimate Rate is Reached Pre-65 8.00 % 4.50 % 2033 Post-65 medical 5.50 4.50 2033 Post-65 prescription 11.00 4.50 2033 Pension Plans The total accumulated benefit obligation for the pension plans at December 31, 2024 and 2023 was as follows: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) December 31, 2024 $ 11,437 $ 2,617 $ 3,438 $ 519 $ 140 $ 779 December 31, 2023 11,991 2,746 3,674 546 145 808 An actuarial gain of $887 million and an actuarial loss of $493 million were recorded for the annual remeasurement of the Southern Company system pension plans at December 31, 2024 and 2023, respectively, primarily due to an increase of 69 basis points and a decrease of 18 basis points, respectively, in the overall discount rate used to calculate the benefit obligation as a result of higher market interest rates. Changes in the projected benefit obligations and the fair value of plan assets during the plan years ended December 31, 2024 and 2023 were as follows: 2024 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Change in benefit obligation Benefit obligation at beginning of year $ 13,252 $ 3,076 $ 4,009 $ 599 $ 177 $ 882 Service cost 292 68 70 12 7 28 Interest cost 635 148 191 29 9 42 Benefits paid (728) (162) (239) (33) (6) (46) Actuarial gain (887) (222) (298) (40) (20) (64) Balance at end of year 12,564 2,908 3,733 567 167 842 Change in plan assets Fair value of plan assets at beginning of year 14,618 3,544 4,571 669 185 980 Actual return on plan assets 604 148 152 23 7 39 Employer contributions 65 9 35 5 2 5 Benefits paid (728) (162) (239) (33) (6) (46) Fair value of plan assets at end of year 14,559 3,539 4,519 664 188 978 Accrued asset $ 1,995 $ 631 $ 786 $ 97 $ 21 $ 136 2023 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Change in benefit obligation Benefit obligation at beginning of year $ 12,602 $ 2,906 $ 3,851 $ 569 $ 163 $ 868 Service cost 275 64 68 11 6 24 Interest cost 626 145 191 28 8 42 Benefits paid (744) (155) (224) (32) (6) (104) Actuarial loss 493 116 123 23 6 52 Balance at end of year 13,252 3,076 4,009 599 177 882 Change in plan assets Fair value of plan assets at beginning of year 14,218 3,427 4,456 649 178 1,002 Actual return on plan assets 1,092 260 331 50 12 79 Employer contributions 52 11 9 2 2 3 Benefits paid (744) (154) (225) (32) (7) (104) Fair value of plan assets at end of year 14,618 3,544 4,571 669 185 980 Accrued asset $ 1,366 $ 468 $ 562 $ 70 $ 8 $ 98 The projected benefit obligations for the qualified and non-qualified pension plans at December 31, 2024 are shown in the following table. All pension plan assets are related to the qualified pension plan. Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Projected benefit obligations: Qualified pension plan $ 11,886 $ 2,794 $ 3,622 $ 540 $ 146 $ 788 Non-qualified pension plan 678 114 111 27 21 54 Amounts recognized in the balance sheets at December 31, 2024 and 2023 related to the Registrants' pension plans consist of the following: Southern Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) December 31, 2024: Prepaid pension costs (a) $ 2,674 $ 746 $ 897 $ 124 $ 41 $ 191 Other regulatory assets, deferred (b) 2,708 741 973 144 — 126 Other current liabilities (68) (13) (13) (2) (2) (4) Employee benefit obligations (c) (611) (102) (98) (25) (18) (51) Other regulatory liabilities, deferred (50) — — — — — AOCI 52 — — — 11 (54) December 31, 2023: Prepaid pension costs (a) $ 2,079 $ 585 $ 706 $ 99 $ 31 $ 158 Other regulatory assets, deferred (b) 2,960 821 1,051 152 — 143 Other current liabilities (64) (11) (13) (2) (2) (3) Employee benefit obligations (c) (649) (106) (131) (27) (21) (58) Other regulatory liabilities, deferred (47) — — — — — AOCI 79 — — — 20 (45) (a) Included in prepaid pension and other postretirement benefit costs on Alabama Power's balance sheet and other deferred charges and assets on Southern Power's consolidated balance sheet. (b) Amounts for Southern Company exclude regulatory assets of $155 million and $173 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company. (c) Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets. Presented below are the amounts included in regulatory assets at December 31, 2024 and 2023 related to the portion of the defined benefit pension plan attributable to Southern Company, the traditional electric operating companies, and Southern Company Gas that had not yet been recognized in net periodic pension cost. Southern Alabama Power Georgia Mississippi Power Southern Company Gas (in millions) Balance at December 31, 2024 Regulatory assets: Prior service cost $ 8 $ 3 $ 5 $ 1 $ (4) Net loss 2,650 738 968 143 91 Regulatory amortization — — — — 39 Total regulatory assets (*) $ 2,658 $ 741 $ 973 $ 144 $ 126 Balance at December 31, 2023 Regulatory assets: Prior service cost $ 9 $ 4 $ 6 $ 1 $ (7) Net loss 2,904 817 1,045 151 100 Regulatory amortization — — — — 50 Total regulatory assets (*) $ 2,913 $ 821 $ 1,051 $ 152 $ 143 (*) Amounts for Southern Company exclude regulatory assets of $155 million and $173 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company. The changes in the balance of regulatory assets related to the portion of the defined benefit pension plan attributable to Southern Company, the traditional electric operating companies, and Southern Company Gas for the years ended December 31, 2024 and 2023 are presented in the following table: Southern Alabama Power Georgia Mississippi Power Southern Company Gas (in millions) Regulatory assets (liabilities): (*) Balance at December 31, 2022 $ 2,371 $ 679 $ 887 $ 123 $ 111 Net loss 576 153 178 31 34 Reclassification adjustments: Amortization of prior service costs (1) (1) (1) — 2 Amortization of net loss (33) (10) (13) (2) — Amortization of regulatory assets (*) — — — — (4) Total reclassification adjustments (34) (11) (14) (2) (2) Total change 542 142 164 29 32 Balance at December 31, 2023 $ 2,913 $ 821 $ 1,051 $ 152 $ 143 Net gain (199) (63) (58) (5) (7) Reclassification adjustments: Amortization of prior service costs (1) (1) (1) — 2 Amortization of net loss (55) (16) (19) (3) (1) Amortization of regulatory assets (*) — — — — (11) Total reclassification adjustments (56) (17) (20) (3) (10) Total change (255) (80) (78) (8) (17) Balance at December 31, 2024 $ 2,658 $ 741 $ 973 $ 144 $ 126 (*) Amounts for Southern Company exclude regulatory assets of $155 million and $173 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company. Presented below are the amounts included in AOCI at December 31, 2024 and 2023 related to the portion of the defined benefit pension plan attributable to Southern Company, Southern Power, and Southern Company Gas that had not yet been recognized in net periodic pension cost. Southern Southern Southern Company (in millions) Balance at December 31, 2024 AOCI: Prior service cost $ (1) $ — $ (1) Net (gain) loss 53 11 (53) Total AOCI $ 52 $ 11 $ (54) Balance at December 31, 2023 AOCI: Prior service cost $ (1) $ — $ (2) Net (gain) loss 80 20 (43) Total AOCI $ 79 $ 20 $ (45) The components of OCI related to the portion of the defined benefit pension plan attributable to Southern Company, Southern Power, and Southern Company Gas for the years ended December 31, 2024 and 2023 are presented in the following table: Southern Company Southern Southern Company (in millions) AOCI: Balance at December 31, 2022 $ 24 $ 11 $ (75) Net loss 62 9 29 Reclassification adjustments: Amortization of prior service costs 1 — 1 Amortization of net loss (8) — — Total reclassification adjustments (7) — 1 Total change 55 9 30 Balance at December 31, 2023 $ 79 $ 20 $ (45) Net gain (29) (9) (11) Reclassification adjustments: Amortization of prior service costs 1 — 2 Amortization of net gain 1 — — Total reclassification adjustments 2 — 2 Total change (27) (9) (9) Balance at December 31, 2024 $ 52 $ 11 $ (54) Components of net periodic pension cost for the Registrants were as follows: Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) 2024 Service cost $ 292 $ 68 $ 70 $ 12 $ 7 $ 28 Interest cost 635 148 191 29 9 42 Expected return on plan assets (1,263) (307) (393) (58) (17) (85) Recognized net loss (*) 55 16 19 3 — — Net amortization (*) — 1 1 — — 15 Prior service cost (*) — — — — — (3) Net periodic pension income $ (281) $ (74) $ (112) $ (14) $ (1) $ (3) 2023 Service cost $ 275 $ 64 $ 68 $ 11 $ 6 $ 24 Interest cost 626 145 191 28 8 42 Expected return on plan assets (1,229) (297) (385) (56) (15) (85) Recognized net (gain) loss (*) 32 9 13 2 — (5) Net amortization (*) — 1 1 — — 15 Prior service cost (*) — — — — — (3) Net periodic pension income $ (296) $ (78) $ (112) $ (15) $ (1) $ (12) 2022 Service cost $ 412 $ 99 $ 103 $ 17 $ 9 $ 34 Interest cost 408 96 123 18 6 28 Expected return on plan assets (1,265) (306) (399) (57) (15) (91) Recognized net loss (*) 240 62 75 11 2 8 Net amortization (*) — 1 1 — — 15 Prior service cost (*) — — — — — (3) Net periodic pension cost (income) $ (205) $ (48) $ (97) $ (11) $ 2 $ (9) (*) For Southern Company, excludes amounts related to net periodic pension cost of $20 million, $17 million, and $21 million for the years ended December 31, 2024, 2023, and 2022, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company. The service cost component of net periodic pension cost is included in operations and maintenance expenses and all other components of net periodic pension cost are included in other income (expense), net in the Registrants' statements of income. Net periodic pension cost is the sum of service cost, interest cost, and other costs netted against the expected return on plan assets. The expected return on plan assets is determined by multiplying the expected rate of return on plan assets and the market-related value of plan assets. In determining the market-related value of plan assets, the Registrants have elected to amortize changes in the market value of return-seeking plan assets over five years and to recognize the changes in the market value of liability-hedging plan assets immediately. Given the significant concentration in return-seeking plan assets, the accounting value of plan assets that is used to calculate the expected return on plan assets differs from the current fair value of the plan assets. Future benefit payments reflect expected future service and are estimated based on assumptions used to measure the projected benefit obligation for the pension plans. At December 31, 2024, estimated benefit payments were as follows: Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Benefit Payments: 2025 $ 773 $ 170 $ 245 $ 34 $ 7 $ 58 2026 801 177 250 36 8 60 2027 823 183 254 37 8 62 2028 842 187 258 38 7 64 2029 862 192 262 38 8 66 2030 to 2034 4,529 1,013 1,333 204 51 346 Other Postretirement Benefits Changes in the APBO and the fair value of the Registrants' plan assets during the plan years ended December 31, 2024 and 2023 were as follows: 2024 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Change in benefit obligation Benefit obligation at beginning of year $ 1,386 $ 329 $ 489 $ 57 $ 9 $ 172 Service cost 15 4 4 1 — 1 Interest cost 65 16 23 3 — 8 Benefits paid (105) (25) (37) (4) (1) (12) Actuarial (gain) loss (2) 2 9 (2) 1 (13) Balance at end of year 1,359 326 488 55 9 156 Change in plan assets Fair value of plan assets at beginning of year 1,095 403 410 25 — 128 Actual return on plan assets 96 37 34 — — 18 Employer contributions 55 6 13 3 1 7 Benefits paid (105) (25) (37) (4) (1) (12) Fair value of plan assets at end of year 1,141 421 420 24 — 141 Accrued asset (liability) $ (218) $ 95 $ (68) $ (31) $ (9) $ (15) 2023 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Change in benefit obligation Benefit obligation at beginning of year $ 1,441 $ 344 $ 514 $ 59 $ 9 $ 179 Service cost 15 4 4 1 — 1 Interest cost 70 17 25 3 — 9 Benefits paid (107) (24) (36) (4) (1) (18) Actuarial (gain) loss (33) (12) (18) (2) 1 1 Balance at end of year 1,386 329 489 57 9 172 Change in plan assets Fair value of plan assets at beginning of year 998 372 368 24 — 113 Actual return on plan assets 131 52 51 2 — 19 Employer contributions 73 3 27 3 1 14 Benefits paid (107) (24) (36) (4) (1) (18) Fair value of plan assets at end of year 1,095 403 410 25 — 128 Accrued asset (liability) $ (291) $ 74 $ (79) $ (32) $ (9) $ (44) Amounts recognized in the balance sheets at December 31, 2024 and 2023 related to the Registrants' other postretirement benefit plans consist of the following: Southern Company Alabama Power Georgia Mississippi Power Southern Southern Company Gas (in millions) December 31, 2024: Prepaid other postretirement benefit costs (a) $ — $ 95 $ — $ — $ — $ — Other regulatory assets, deferred (b) 24 — 3 — — — Other current liabilities (6) — — — (1) — Employee benefit obligations (c) (212) — (68) (31) (8) (15) Other regulatory liabilities, deferred (213) (45) (67) (9) — (84) AOCI (14) — — — — (15) December 31, 2023: Prepaid other postretirement benefit costs (a) $ — $ 74 $ — $ — $ — $ — Other regulatory assets, deferred (b) 23 — 11 — — — Other current liabilities (6) — — — (1) — Employee benefit obligations (c) (285) — (79) (32) (8) (44) Other regulatory liabilities, deferred (231) (48) (85) (10) — (68) AOCI (9) — — — 1 (10) (a) Included in prepaid pension and other postretirement benefit costs on Alabama Power's balance sheet. (b) Amounts for Southern Company exclude regulatory assets of $16 million and $24 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company. (c) Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets. Presented below are the amounts included in net regulatory assets (liabilities) at December 31, 2024 and 2023 related to the other postretirement benefit plans of Southern Company, the traditional electric operating companies, and Southern Company Gas that had not yet been recognized in net periodic other postretirement benefit cost. Southern Company Alabama Power Georgia Mississippi Power Southern Company Gas (in millions) Balance at December 31, 2024: Regulatory assets (liabilities): Prior service cost $ 11 $ 3 $ 4 $ 1 $ — Net gain (200) (48) (68) (10) (71) Regulatory amortization — — — — (13) Total regulatory assets (liabilities) (*) $ (189) $ (45) $ (64) $ (9) $ (84) Balance at December 31, 2023: Regulatory assets (liabilities): Prior service cost $ 13 $ 4 $ 5 $ 1 $ — Net gain (216) (52) (79) (11) (64) Regulatory amortization — — — — (4) Total regulatory assets (liabilities) (*) $ (203) $ (48) $ (74) $ (10) $ (68) (*) Amounts for Southern Company exclude regulatory assets of $16 million and $24 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company. The changes in the balance of net regulatory assets (liabilities) related to the other postretirement benefit plans for the plan years ended December 31, 2024 and 2023 are presented in the following table: Southern Company Alabama Power Georgia Mississippi Power Southern Company Gas (in millions) Net regulatory assets (liabilities): (*) Balance at December 31, 2022 $ (136) $ (21) $ (39) $ (9) $ (58) Net gain (77) (30) (38) (1) — Reclassification adjustments: Amortization of prior service costs (1) — (1) — — Amortization of net gain 6 3 4 — — Amortization of regulatory assets (*) — — — — (10) Total reclassification adjustments 5 3 3 — (10) Total change (72) (27) (35) (1) (10) Balance at December 31, 2023 $ (208) $ (48) $ (74) $ (10) $ (68) Net (gain) loss 8 1 6 1 (12) Reclassification adjustments: Amortization of prior service costs (2) (1) (1) — — Amortization of net gain 13 3 5 — 5 Amortization of regulatory assets (*) — — — — (9) Total reclassification adjustments 11 2 4 — (4) Total change 19 3 10 1 (16) Balance at December 31, 2024 $ (189) $ (45) $ (64) $ (9) $ (84) (*) Amounts for Southern Company exclude regulatory assets of $16 million and $24 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company. Presented below are the amounts included in AOCI at December 31, 2024 and 2023 related to the other postretirement benefit plans of Southern Company, Southern Power, and Southern Company Gas that had not yet been recognized in net periodic other postretirement benefit cost. Southern Southern Southern Company (in millions) Balance at December 31, 2024 AOCI: Net (gain) loss $ (14) $ — $ (15) Balance at December 31, 2023 AOCI: Prior service cost $ 1 $ — $ — Net (gain) loss (10) 1 (10) Total AOCI $ (9) $ 1 $ (10) The components of OCI related to the other postretirement benefit plans for the plan years ended December 31, 2024 and 2023 are presented in the following table: Southern Company Southern Southern Company Gas (in millions) AOCI: Balance at December 31, 2022 $ (4) $ — $ (2) Net (gain) loss (12) 1 — Reclassification adjustments: Amortization of net gain (loss) 7 — (8) Total change (5) 1 (8) Balance at December 31, 2023 $ (9) $ 1 $ (10) Net gain (8) (1) (5) Reclassification adjustments: Amortization of net gain (loss) 3 — — Total change (5) (1) (5) Balance at December 31, 2024 $ (14) $ — $ (15) Components of the other postretirement benefit plans' net periodic cost for the Registrants were as follows: Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) 2024 Service cost $ 15 $ 4 $ 4 $ 1 $ — $ 1 Interest cost 65 16 23 3 — 8 Expected return on plan assets (89) (35) (32) (3) 1 (13) Net amortization (*) (13) (3) (4) — — 6 Net periodic other postretirement benefit cost (income) $ (22) $ (18) $ (9) $ 1 $ 1 $ 2 2023 Service cost $ 15 $ 4 $ 4 $ 1 $ — $ 1 Interest cost 70 17 25 3 — 9 Expected return on plan assets (83) (33) (29) (3) 1 (10) Net amortization (*) (11) (3) (3) — — 6 Net periodic other postretirement benefit cost (income) $ (9) $ (15) $ (3) $ 1 $ 1 $ 6 2022 Service cost $ 23 $ 6 $ 6 $ 1 $ — $ 1 Interest cost 42 10 15 2 — 5 Expected return on plan assets (80) (32) (28) (2) 1 (9) Net amortization (*) (1) — 2 — — 6 Net periodic other postretirement benefit cost (income) $ (16) $ (16) $ (5) $ 1 $ 1 $ 3 (*) For Southern Company, excludes amounts related to net periodic other postretirement benefit cost of $8 million for all years presented associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company. The service cost component of net periodic other postretirement benefit cost is included in operations and maintenance expenses and all other components of net periodic other postretirement benefit cost are included in other income (expense), net in the Registrants' statements of income. The Registrants' future benefit payments, including prescription drug benefits, are provided in the table below. These amounts reflect expected future service and are estimated based on assumptions used to measure the APBO for the other postretirement benefit plans. Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Benefit payments: 2025 $ 112 $ 24 $ 40 $ 5 $ 1 $ 16 2026 112 25 40 5 1 16 2027 113 26 41 5 1 15 2028 114 26 41 5 1 15 2029 114 27 42 5 1 14 2030 to 2034 558 133 205 22 1 61 Benefit Plan Assets Pension plan and other postretirement benefit plan assets are managed and invested in accordance with all applicable requirements, including ERISA and the Internal Revenue Code. The Registrants' investment policies for both the pension plans and the other postretirement benefit plans cover a diversified mix of assets as described below. Derivative instruments may be used to gain efficient exposure to the various asset classes and as hedging tools. Additionally, the Registrants minimize the risk of large losses primarily through diversification but also monitor and manage other aspects of risk. The investment strategy for plan assets related to the Southern Company system's qualified pension plan is to be broadly diversified across major asset classes. The asset allocation is established after consideration of various factors that affect the assets and liabilities of the pension plan including, but not limited to, historical and expected returns and interest rates, volatility, correlations of asset classes, the current level of assets and liabilities, and the assumed growth in assets and liabilities. Because a significant portion of the liability of the pension plan is long-term in nature, the assets are invested consistent with long-term investment expectations for return and risk. To manage the actual asset class exposures relative to the target asset allocation, the Southern Company system employs a formal rebalancing program. As additional risk management, external investment managers and service providers are subject to written guidelines to ensure appropriate and prudent investment practices. Management believes the portfolio is well-diversified with no significant concentrations of risk. Investment Strategies and Benefit Plan Asset Fair Values A description of the major asset classes that the pension and other postretirement benefit plans are comprised of, along with the valuation methods used for fair value measurement, is provided below: Description Valuation Methodology Domestic equity: A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches. International equity: A mix of large and small capitalization growth and value stocks with developed and emerging markets exposure, managed both actively and through fundamental indexing approaches. Domestic and international equities such as common stocks, American depositary receipts, and real estate investment trusts that trade on public exchanges are classified as Level 1 investments and are valued at the closing price in the active market. Equity funds with unpublished prices that are comprised of publicly traded securities (such as commingled/pooled funds) are also valued at the closing price in the active market but are classified as Level 2. Fixed income: A mix of domestic and international bonds. Investments in fixed income securities, including fixed income pooled funds, are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument. Trust-owned life insurance (TOLI): Investments of taxable trusts aimed at minimizing the impact of taxes on the portfolio. Investments in TOLI policies are classified as Level 2 investments and are valued based on the underlying investments held in the policy's separate accounts. The underlying assets are equity and fixed income pooled funds that are comprised of Level 1 and Level 2 securities. Real estate: Investments in equity or debt of real properties and in publicly traded real estate securities. Special situations: Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies, as well as investments in promising new strategies of a longer-term nature. Private equity: Investments in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt. Private credit: Investments focused on debt instruments, of which returns are driven by income rather than capital appreciation. Infrastructure: Investments in real assets, typically with long-term, predictable, and stable cash flows and a meaningful income component. Investments in real estate, special situations, private equity, private credit, and infrastructure are typically invested in private partnerships and/or other pooled vehicles (Investment Funds) which are generally classified as Net Asset Value as a Practical Expedient, since the Investment Funds and underlying assets are not publicly traded and/or often have liquidity restrictions. The managers of the Investment Funds value the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The total market value of each of the Investment Funds is determined by aggregating the value of the underlying assets less liabilities. For purposes of determining the fair value of the pension plan and other postretirement benefit plan assets and the appropriate level designation, management relies on information provided by the plan's trustee. This information is reviewed and evaluated by management with changes made to the trustee information as appropriate. The fair values presented herein exclude cash, receivables related to investment income and pending investment sales, and payables related to pending investmen

STOCK COMPENSATION

STOCK COMPENSATION	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
STOCK COMPENSATION	STOCK COMPENSATION Stock-based compensation in the form of Southern Company performance share units (PSU) and restricted stock units (RSU) may be granted through the Equity and Incentive Compensation Plan to eligible Southern Company system employees. At December 31, 2024, the number of current and former employees participating in stock-based compensation programs for the Registrants was as follows: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas Number of employees 1,154 158 161 36 36 183 The majority of PSUs and RSUs awarded contain terms where employees become immediately vested in PSUs and RSUs upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately, while compensation expense for employees that are expected to become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility. In addition, the Registrants recognize forfeitures as they occur. All unvested PSUs and RSUs vest immediately upon a change in control where Southern Company is not the surviving corporation. Stock-based compensation activity is immaterial for the Subsidiary Registrants. Performance Share Units PSUs granted to employees vest at the end of a three-year performance period. Shares of Southern Company common stock are delivered to employees at the end of the performance period with the number of shares issued ranging from 0% to 200% of the target number of PSUs granted, based on achievement of the performance goals established by the Compensation Committee of the Southern Company Board of Directors. Southern Company has issued two types of PSUs, each with a unique performance goal. These types of PSUs include total shareholder return (TSR) awards based on the TSR for Southern Company common stock during the three The fair value of TSR awards is determined as of the grant date using a Monte Carlo simulation model. In determining the fair value of the TSR awards issued to employees, the expected volatility is based on the historical volatility of Southern Company's stock over a period equal to the performance period. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant that covers the performance period of the awards. The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of TSR awards granted: Year Ended December 31 2024 2023 2022 Expected volatility 19.1% 30.0% 29.6% Interest rate 4.0% 3.8% 1.7% Weighted average grant-date fair value $80.99 $76.83 $79.69 The Registrants recognize TSR award compensation expense on a straight-line basis over the three-year performance period without remeasurement. The fair values of ROE awards are based on the closing stock price of Southern Company common stock on the date of the grant. The weighted average grant-date fair value of the ROE awards granted during 2024, 2023, and 2022 was $69.67, $68.93, and $66.87, respectively. Compensation expense for ROE awards is generally recognized ratably over the three-year performance period adjusted for expected changes in ROE performance. Total compensation cost recognized for vested ROE awards reflects final performance metrics. Southern Company had 2.4 million unvested PSUs outstanding at December 31, 2023. In February 2024, the PSUs that vested for the three-year performance period ended December 31, 2023 were converted into 2.3 million shares outstanding at a share price of $66.95. During 2024, Southern Company granted 1.1 million PSUs and 1.2 million PSUs were vested or forfeited, resulting in 2.3 million unvested PSUs outstanding at December 31, 2024. In February 2025, the PSUs that vested for the three-year performance period ended December 31, 2024 were converted into 2.0 million shares outstanding at a weighted average share price of $83.87. Southern Company's total PSU compensation cost and the related tax benefit recognized in income for the years ended December 31, 2024, 2023, and 2022 were as follows: 2024 2023 2022 (in millions) Compensation cost recognized in income $ 102 $ 107 $ 101 Tax benefit of compensation cost recognized in income 27 28 26 The compensation cost related to the grant of Southern Company PSUs to the employees of each Subsidiary Registrant is recognized in each Subsidiary Registrant's financial statements with a corresponding credit to equity representing a capital contribution from Southern Company. At December 31, 2024, Southern Company's total unrecognized compensation cost related to PSUs was $33 million and is expected to be recognized over a weighted-average period of approximately 19 months. Restricted Stock Units The fair value of RSUs is based on the closing stock price of Southern Company common stock on the date of the grant. The weighted average grant-date fair values of RSUs granted during 2024, 2023, and 2022 were $70.49, $68.95, and $67.20, respectively. For most RSU awards, one-third of the RSUs vest each year throughout a three-year service period and compensation cost for RSUs is generally recognized over the corresponding one two Southern Company had 0.9 million RSUs outstanding at December 31, 2023. During 2024, Southern Company granted 0.5 million RSUs and 0.5 million RSUs were vested or forfeited, resulting in 0.9 million unvested RSUs outstanding at December 31, 2024, including RSUs related to employee retention agreements. Southern Company's total RSU compensation cost and the related tax benefit recognized in income for the years ended December 31, 2024, 2023, and 2022 were as follows: 2024 2023 2022 (in millions) Compensation cost recognized in income $ 30 $ 30 $ 26 Tax benefit of compensation cost recognized in income 8 8 7 Total unrecognized compensation cost related to RSUs at December 31, 2024, which is being recognized over a weighted-average period of approximately 19 months, was immaterial for Southern Company. The compensation cost related to the grant of Southern Company RSUs to the employees of each Subsidiary Registrant is recognized in such Subsidiary Registrant's financial statements with a corresponding credit to equity representing a capital contribution from Southern Company. Stock Options In 2015, Southern Company discontinued granting stock options. As of December 31, 2017, all stock option awards were vested and compensation cost fully recognized and the last exercise occurred in November 2024. Southern Company's cash receipts from issuances related to stock options exercised under the share-based payment arrangements for the years ended December 31, 2024, 2023, and 2022 were $14 million, $28 million, and $75 million, respectively. Southern Company's total intrinsic value of options exercised and the related tax benefit for the years ended December 31, 2024, 2023, and 2022 were as follows: 2024 2023 2022 (in millions) Intrinsic value of options exercised $ 10 $ 18 $ 49 Tax benefit of options exercised 2 4 12

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS Fair value measurements are based on inputs of observable and unobservable market data that a market participant would use in pricing the asset or liability. The use of observable inputs is maximized where available and the use of unobservable inputs is minimized for fair value measurement and reflects a three-tier fair value hierarchy that prioritizes inputs to valuation techniques used for fair value measurement. • Level 1 consists of observable market data in an active market for identical assets or liabilities. • Level 2 consists of observable market data, other than that included in Level 1, that is either directly or indirectly observable. • Level 3 consists of unobservable market data. The input may reflect the assumptions of each Registrant of what a market participant would use in pricing an asset or liability. If there is little available market data, then each Registrant's own assumptions are the best available information. In the case of multiple inputs being used in a fair value measurement, the lowest level input that is significant to the fair value measurement represents the level in the fair value hierarchy in which the fair value measurement is reported. Net asset value as a practical expedient is the classification used for assets that do not have readily determined fair values. Fund managers value the assets using various inputs and techniques depending on the nature of the underlying investments. At December 31, 2024, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows: Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2024: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Southern Company Assets: Energy-related derivatives (a) $ 12 $ 77 $ — $ — $ 89 Investments in trusts: (b) Domestic equity 849 250 — — 1,099 Foreign equity 148 175 — — 323 U.S. Treasury and government agency securities — 371 — — 371 Municipal bonds — 47 — — 47 Pooled funds – fixed income — 7 — — 7 Corporate bonds — 452 — — 452 Mortgage and asset backed securities — 106 — — 106 Private equity — — — 181 181 Cash and cash equivalents 1 — — — 1 Other 39 3 — 9 51 Investments, available for sale: U.S. Treasury and government agency securities 2 7 — — 9 Corporate bonds 1 2 — — 3 Mortgage and asset backed securities — 10 — — 10 Cash equivalents and restricted cash 533 19 — — 552 Other investments 9 31 8 — 48 Total $ 1,594 $ 1,557 $ 8 $ 190 $ 3,349 Liabilities: Energy-related derivatives (a) $ 5 $ 124 $ — $ — $ 129 Interest rate derivatives — 269 — — 269 Foreign currency derivatives — 218 — — 218 Contingent consideration 3 — 16 — 19 Other — 13 11 — 24 Total $ 8 $ 624 $ 27 $ — $ 659 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2024: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Alabama Power Assets: Energy-related derivatives $ — $ 26 $ — $ — $ 26 Nuclear decommissioning trusts: (b) Domestic equity 459 241 — — 700 Foreign equity 148 — — — 148 U.S. Treasury and government agency securities — 16 — — 16 Municipal bonds — 1 — — 1 Corporate bonds — 287 — — 287 Mortgage and asset backed securities — 31 — — 31 Private equity — — — 181 181 Other 11 1 — 9 21 Cash equivalents and restricted cash 334 19 — — 353 Other investments — 31 — — 31 Total $ 952 $ 653 $ — $ 190 $ 1,795 Liabilities: Energy-related derivatives $ — $ 42 $ — $ — $ 42 Georgia Power Assets: Energy-related derivatives $ — $ 19 $ — $ — $ 19 Nuclear decommissioning trusts: (b) Domestic equity 390 1 — — 391 Foreign equity — 174 — — 174 U.S. Treasury and government agency securities — 355 — — 355 Municipal bonds — 46 — — 46 Corporate bonds — 165 — — 165 Mortgage and asset backed securities — 75 — — 75 Other 28 2 — — 30 Cash equivalents 35 — — — 35 Total $ 453 $ 837 $ — $ — $ 1,290 Liabilities: Energy-related derivatives $ — $ 42 $ — $ — $ 42 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2024: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Mississippi Power Assets: Energy-related derivatives $ — $ 19 $ — $ — $ 19 Liabilities: Energy-related derivatives $ — $ 34 $ — $ — $ 34 Southern Power Assets: Energy-related derivatives $ — $ 4 $ — $ — $ 4 Cash equivalents 51 — — — 51 Total $ 51 $ 4 $ — $ — $ 55 Liabilities: Foreign currency derivatives $ — $ 51 $ — $ — $ 51 Contingent consideration 3 — 16 — 19 Other — 13 11 — 24 Total $ 3 $ 64 $ 27 $ — $ 94 Southern Company Gas Assets: Energy-related derivatives (a) $ 12 $ 9 $ — $ — $ 21 Non-qualified deferred compensation trusts: Domestic equity — 8 — — 8 Foreign equity — 1 — — 1 Pooled funds - fixed income — 7 — — 7 Cash and cash equivalents 1 — — — 1 Investments, available for sale: U.S. Treasury and government agency securities 2 7 — — 9 Corporate bonds 1 2 — — 3 Mortgage and asset backed securities — 10 — — 10 Cash equivalents 22 — — — 22 Total $ 38 $ 44 $ — $ — $ 82 Liabilities: Energy-related derivatives (a) $ 5 $ 6 $ — $ — $ 11 Interest rate derivatives — 84 — — 84 Total $ 5 $ 90 $ — $ — $ 95 (a) Excludes cash collateral of $17 million. (b) Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 under "Nuclear Decommissioning" for additional information. At December 31, 2023, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows: Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2023: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Southern Company Assets: Energy-related derivatives (a) $ 6 $ 49 $ — $ — $ 55 Investments in trusts: (b) Domestic equity 764 216 — — 980 Foreign equity 145 171 — — 316 U.S. Treasury and government agency securities — 369 — — 369 Municipal bonds — 48 — — 48 Pooled funds – fixed income — 6 — — 6 Corporate bonds — 389 — — 389 Mortgage and asset backed securities — 89 — — 89 Private equity — — — 169 169 Cash and cash equivalents 3 — — — 3 Other 58 3 — 9 70 Cash equivalents and restricted cash 253 15 — — 268 Other investments 9 27 8 — 44 Total $ 1,238 $ 1,382 $ 8 $ 178 $ 2,806 Liabilities: Energy-related derivatives (a) $ 46 $ 312 $ — $ — $ 358 Interest rate derivatives — 264 — — 264 Foreign currency derivatives — 122 — — 122 Contingent consideration 3 — 16 — 19 Other — 13 — — 13 Total $ 49 $ 711 $ 16 $ — $ 776 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2023: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Alabama Power Assets: Energy-related derivatives $ — $ 15 $ — $ — $ 15 Nuclear decommissioning trusts: (b) Domestic equity 443 208 — — 651 Foreign equity 145 — — — 145 U.S. Treasury and government agency securities — 20 — — 20 Municipal bonds — 1 — — 1 Corporate bonds — 231 — — 231 Mortgage and asset backed securities — 25 — — 25 Private equity — — — 169 169 Other 8 — — 9 17 Cash equivalents and restricted cash 119 15 — — 134 Other investments — 27 — — 27 Total $ 715 $ 542 $ — $ 178 $ 1,435 Liabilities: Energy-related derivatives $ — $ 110 $ — $ — $ 110 Georgia Power Assets: Energy-related derivatives $ — $ 13 $ — $ — $ 13 Nuclear decommissioning trusts: (b) Domestic equity 321 1 — — 322 Foreign equity — 170 — — 170 U.S. Treasury and government agency securities — 349 — — 349 Municipal bonds — 47 — — 47 Corporate bonds — 158 — — 158 Mortgage and asset backed securities — 64 — — 64 Other 50 3 — — 53 Total $ 371 $ 805 $ — $ — $ 1,176 Liabilities: Energy-related derivatives $ — $ 124 $ — $ — $ 124 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2023: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Mississippi Power Assets: Energy-related derivatives $ — $ 15 $ — $ — $ 15 Cash equivalents 17 — — — 17 Total $ 17 $ 15 $ — $ — $ 32 Liabilities: Energy-related derivatives $ — $ 61 $ — $ — $ 61 Southern Power Assets: Energy-related derivatives $ — $ 3 $ — $ — $ 3 Liabilities: Energy-related derivatives $ — $ 5 $ — $ — $ 5 Foreign currency derivatives — 22 — — 22 Contingent consideration 3 — 16 — 19 Other — 13 — — 13 Total $ 3 $ 40 $ 16 $ — $ 59 Southern Company Gas Assets: Energy-related derivatives (a) $ 6 $ 3 $ — $ — $ 9 Non-qualified deferred compensation trusts: Domestic equity — 7 — — 7 Foreign equity — 1 — — 1 Pooled funds - fixed income — 6 — — 6 Cash and cash equivalents 3 — — — 3 Total $ 9 $ 17 $ — $ — $ 26 Liabilities: Energy-related derivatives (a) $ 46 $ 12 $ — $ — $ 58 Interest rate derivatives — 79 — — 79 Total $ 46 $ 91 $ — $ — $ 137 (a) Excludes cash collateral of $62 million. (b) Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 under "Nuclear Decommissioning" for additional information. Valuation Methodologies The energy-related derivatives primarily consist of exchange-traded and OTC financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard OTC products that are valued using observable market data and assumptions commonly used by market participants. The fair value of interest rate derivatives reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and, occasionally, implied volatility of interest rate options. The fair value of cross-currency swaps reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future foreign currency exchange rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and discount rates. The interest rate derivatives and cross-currency swaps are categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of similar instruments. See Note 14 for additional information on how these derivatives are used. For fair value measurements of the investments within the nuclear decommissioning trusts and the non-qualified deferred compensation trusts, external pricing vendors are designated for each asset class with each security specifically assigned a primary pricing source. For investments held within commingled funds, fair value is determined at the end of each business day through the net asset value, which is established by obtaining the underlying securities' individual prices from the primary pricing source. A market price secured from the primary source vendor is then evaluated by management in its valuation of the assets within the trusts. As a general approach, fixed income market pricing vendors gather market data (including indices and market research reports) and integrate relative credit information, observed market movements, and sector news into proprietary pricing models, pricing systems, and mathematical tools. Dealer quotes and other market information, including live trading levels and pricing analysts' judgments, are also obtained when available. The NRC requires licensees of commissioned nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. See Note 6 under "Nuclear Decommissioning" for additional information. Southern Power has contingent payment obligations related to two of its acquisitions whereby it is primarily obligated to make generation-based payments to the seller, commencing at the commercial operation of each facility and continuing through 2026 and 2036, respectively. The obligations are primarily categorized as Level 3 under Fair Value Measurements as the fair value is determined using significant unobservable inputs for the forecasted facility's generation in MW-hours, as well as other inputs such as a fixed dollar amount per MW-hour, and a discount rate. The fair value of the obligations reflects the net present value of expected payments and any periodic change arising from forecasted generation is expected to be immaterial. Southern Power also has payment obligations through 2040 whereby it must reimburse the transmission owners for interconnection facilities and network upgrades constructed to support connection of a Southern Power generating facility to the transmission system. The obligations are categorized as Level 2 under Fair Value Measurements as the fair value is determined using observable inputs for the contracted amounts and reimbursement period, as well as a discount rate. The fair value of the obligations reflects the net present value of expected payments. "Other investments" primarily includes investments traded in the open market that have maturities greater than 90 days, which are categorized as Level 2 under Fair Value Measurements and are comprised of corporate bonds, bank certificates of deposit, treasury bonds, and/or agency bonds. The fair value measurements of private market investments held in Alabama Power's nuclear decommissioning trusts that are calculated at net asset value per share (or its equivalent) as a practical expedient totaled $190 million and $178 million at December 31, 2024 and 2023, respectively. Unfunded commitments related to the private market investments totaled $78 million and $87 million at December 31, 2024 and 2023, respectively. Private market investments include high-quality private equity funds across several market sectors, funds that invest in real estate assets, and a private credit fund. Private market funds do not have redemption rights. Distributions from these funds will be received as the underlying investments in the funds are liquidated. Southern Company Gas' investments, available for sale relate to a wholly-owned subsidiary that insures various risk exposures of Southern Company Gas and its subsidiaries. Corporate and municipal bonds, government agency securities, and commercial paper are valued using pricing models maximizing the use of observable inputs for similar securities, including basing value on yields currently available on comparable securities of issues with similar credit ratings. Mortgage and asset backed securities are valued through an analysis of the underlying assets and a review of the documentation, including financials, the manager's valuation methodology in valuing their underlying assets, the types of assets and risks involved, and the investor's exit and termination parameters. At December 31, 2024 and 2023, other financial instruments for which the carrying amount did not equal fair value were as follows: Southern Company (*) Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (*) (in billions) At December 31, 2024: Long-term debt, including securities due within one year: Carrying amount $ 63.2 $ 11.2 $ 18.1 $ 1.7 $ 2.7 $ 8.5 Fair value 57.7 9.8 16.2 1.5 2.6 7.4 At December 31, 2023: Long-term debt, including securities due within one year: Carrying amount $ 59.4 $ 11.2 $ 16.5 $ 1.6 $ 2.7 $ 7.8 Fair value 55.0 10.1 15.1 1.4 2.6 6.8 (*) The carrying amount of Southern Company Gas' long-term debt includes fair value adjustments from the effective date of the 2016 merger with Southern Company. Southern Company Gas amortizes the fair value adjustments over the remaining lives of the respective bonds, the latest being through 2043. The fair values are determined using Level 2 measurements and are based on quoted market prices for the same or similar issues or on the current rates available to the Registrants.

DERIVATIVES

DERIVATIVES	12 Months Ended
	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES	DERIVATIVES The Registrants are exposed to market risks, including commodity price risk, interest rate risk, weather risk, and occasionally foreign currency exchange rate risk. To manage the volatility attributable to these exposures, each company nets its exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to each company's policies in areas such as counterparty exposure and risk management practices. Each company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the balance sheets as either assets or liabilities and are presented on a net basis. See Note 13 for additional fair value information. In the statements of cash flows, any cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities. Any cash impacts of settled foreign currency derivatives are classified as operating or financing activities to correspond with the classification of the hedged interest or principal, respectively. See Note 1 under "Financial Instruments" for additional information. Energy-Related Derivatives The Subsidiary Registrants enter into energy-related derivatives to hedge exposures to electricity, natural gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the traditional electric operating companies and the natural gas distribution utilities have limited exposure to market volatility in energy-related commodity prices. Each of the traditional electric operating companies and certain of the natural gas distribution utilities of Southern Company Gas manage fuel-hedging programs, implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies, through the use of financial derivative contracts, which are expected to continue to mitigate price volatility. The traditional electric operating companies (with respect to wholesale generating capacity) and Southern Power have limited exposure to market volatility in energy-related commodity prices because their long-term sales contracts shift substantially all fuel cost responsibility to the purchaser. However, the traditional electric operating companies and Southern Power may be exposed to market volatility in energy-related commodity prices to the extent any uncontracted capacity is used to sell electricity. Southern Company Gas retains exposure to price changes that can, in a volatile energy market, be material and can adversely affect its results of operations. Southern Company Gas also enters into weather derivative contracts as economic hedges in the event of warmer-than-normal weather. Exchange-traded options are carried at fair value, with changes reflected in natural gas revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the intrinsic value for non-exchange-traded contracts are reflected in natural gas revenues. Energy-related derivative contracts are accounted for under one of three methods: • Regulatory Hedges – Energy-related derivative contracts designated as regulatory hedges relate primarily to the traditional electric operating companies' and the natural gas distribution utilities' fuel-hedging programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as the underlying fuel is used in operations and ultimately recovered through an approved cost recovery mechanism. • Cash Flow Hedges – Gains and losses on energy-related derivatives designated as cash flow hedges (which are mainly used to hedge anticipated purchases and sales) are initially deferred in AOCI before being recognized in the statements of income in the same period and in the same income statement line item as the earnings effect of the hedged transactions. • Not Designated – Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred. Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric and natural gas industries. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered. At December 31, 2024, the net volume of energy-related derivative contracts for natural gas positions, together with the longest hedge date over which the respective entity is hedging its exposure to the variability in future cash flows for forecasted transactions and the longest non-hedge date for derivatives not designated as hedges, were as follows: Net Longest Longest (in millions) Southern Company (*) 431 2030 2028 Alabama Power 123 2027 — Georgia Power 116 2027 — Mississippi Power 103 2028 — Southern Power 6 2030 2025 Southern Company Gas (*) 83 2027 2028 (*) Southern Company Gas' derivative instruments include both long and short natural gas positions. A long position is a contract to purchase natural gas and a short position is a contract to sell natural gas. Southern Company Gas' volume represents the net of long natural gas positions of 90 million mmBtu and short natural gas positions of 7 million mmBtu at December 31, 2024, which is also included in Southern Company's total volume. In addition to the volumes discussed above, the traditional electric operating companies and Southern Power enter into physical natural gas supply contracts that provide the option to sell back excess natural gas due to operational constraints. The maximum expected volume of natural gas subject to such a feature is 15 million mmBtu for Southern Company, which includes 4 million mmBtu for Alabama Power, 6 million mmBtu for Georgia Power, 2 million mmBtu for Mississippi Power, and 3 million mmBtu for Southern Power. For cash flow hedges of energy-related derivatives, the estimated pre-tax gains (losses) expected to be reclassified from AOCI to earnings for the year ending December 31, 2025 are immaterial for Southern Company, Southern Power, and Southern Company Gas. Interest Rate Derivatives Southern Company and certain subsidiaries may enter into interest rate derivatives to hedge exposure to changes in interest rates. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and presented on the same income statement line item as the earnings effect of the hedged transactions. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item. Fair value gains or losses on derivatives that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred. At December 31, 2024, the following interest rate derivatives were outstanding: Notional Weighted Average Interest Rate Paid Interest Hedge Fair Value (in millions) (in millions) Fair Value Hedges of Existing Debt Southern Company parent $ 400 1-month SOFR + 0.80% 1.75% March 2028 $ (42) Southern Company parent 1,000 1-month SOFR + 2.48% 3.70% April 2030 (143) Southern Company Gas 500 1-month SOFR + 0.49% 1.75% January 2031 (84) Southern Company $ 1,900 $ (269) For cash flow hedges of interest rate derivatives, the estimated pre-tax gains (losses) expected to be reclassified from AOCI to interest expense for the year ending December 31, 2025 are $(13) million for Southern Company and immaterial for the traditional electric operating companies and Southern Company Gas. Deferred gains and losses related to interest rate derivatives are expected to be amortized into earnings through 2054 for Southern Company, Georgia Power, and Mississippi Power, 2052 for Alabama Power, and 2046 for Southern Company Gas. Foreign Currency Derivatives Southern Company and certain subsidiaries, including Southern Power, may enter into foreign currency derivatives to hedge exposure to changes in foreign currency exchange rates, such as that arising from the issuance of debt denominated in a currency other than U.S. dollars. Derivatives related to forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and on the same income statement line as the earnings effect of the hedged transactions, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Southern Company has elected to exclude the cross-currency basis spread from the assessment of effectiveness in the fair value hedges of its foreign currency risk and record any difference between the change in the fair value of the excluded components and the amounts recognized in earnings as a component of OCI. At December 31, 2024, the following foreign currency derivatives were outstanding: Pay Notional Pay Rate Receive Notional Receive Rate Hedge Fair Value (in millions) (in millions) (in millions) Cash Flow Hedges of Existing Debt Southern Power $ 564 3.78% € 500 1.85% June 2026 $ (51) Fair Value Hedges of Existing Debt Southern Company parent 1,476 3.39% 1,250 1.88% September 2027 (167) Southern Company $ 2,040 € 1,750 $ (218) For cash flow hedges of foreign currency derivatives, the estimated pre-tax losses expected to be reclassified from AOCI to earnings for the year ending December 31, 2025 are $25 million for Southern Power. Derivative Financial Statement Presentation and Amounts The Registrants enter into derivative contracts that may contain certain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements. Southern Company and certain subsidiaries also utilize master netting agreements to mitigate exposure to counterparty credit risk. These agreements may contain provisions that permit netting across product lines and against cash collateral. The fair value amounts of derivative assets and liabilities on the balance sheets are presented net to the extent that there are netting arrangements or similar agreements with the counterparties. The fair value of energy-related derivatives, interest rate derivatives, and foreign currency derivatives was reflected as either assets or liabilities in the balance sheets (included in "Other" or shown separately as "Risk Management Activities") as follows: 2024 2023 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) Southern Company Energy-related derivatives designated as hedging instruments for regulatory purposes Current $ 33 $ 82 $ 12 $ 198 Non-current 42 40 31 117 Total derivatives designated as hedging instruments for regulatory purposes 75 122 43 315 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Current 4 3 — 29 Non-current 4 — 3 4 Interest rate derivatives: Current — 61 — 74 Non-current — 208 — 190 Foreign currency derivatives: Current — 36 — 34 Non-current — 182 — 88 Total derivatives designated as hedging instruments in cash flow and fair value hedges 8 490 3 419 Energy-related derivatives not designated as hedging instruments Current 5 3 8 8 Non-current 1 — 1 2 Total derivatives not designated as hedging instruments 6 3 9 10 Gross amounts recognized 89 615 55 744 Gross amounts offset (a) (44) (61) (23) (85) Net amounts recognized in the Balance Sheets (b) $ 45 $ 554 $ 32 $ 659 Alabama Power Energy-related derivatives designated as hedging instruments for regulatory purposes Current $ 11 $ 30 $ 6 $ 69 Non-current 15 12 9 41 Total derivatives designated as hedging instruments for regulatory purposes 26 42 15 110 Gross amounts offset (19) (19) (10) (10) Net amounts recognized in the Balance Sheets $ 7 $ 23 $ 5 $ 100 2024 2023 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) Georgia Power Energy-related derivatives designated as hedging instruments for regulatory purposes Current $ 6 $ 32 $ 2 $ 82 Non-current 13 9 10 42 Total derivatives designated as hedging instruments for regulatory purposes 19 41 12 124 Energy-related derivatives not designated as hedging instruments Current — 1 — — Non-current — — 1 — Total derivatives not designated as hedging instruments — 1 1 — Gross amounts recognized 19 42 13 124 Gross amounts offset (15) (15) (11) (11) Net amounts recognized in the Balance Sheets $ 4 $ 27 $ 2 $ 113 Mississippi Power Energy-related derivatives designated as hedging instruments for regulatory purposes Current $ 5 $ 15 $ 3 $ 27 Non-current 14 19 12 34 Total derivatives designated as hedging instruments for regulatory purposes 19 34 15 61 Gross amounts offset (17) (17) (14) (14) Net amounts recognized in the Balance Sheets $ 2 $ 17 $ 1 $ 47 Southern Power Derivatives designated as hedging instruments in cash flow hedges Energy-related derivatives: Current $ 1 $ — $ — $ 5 Non-current 3 — 3 — Foreign currency derivatives: Current — 11 — 11 Non-current — 40 — 11 Total derivatives designated as hedging instruments in cash flow hedges 4 51 3 27 Net amounts recognized in the Balance Sheets $ 4 $ 51 $ 3 $ 27 2024 2023 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) Southern Company Gas Energy-related derivatives designated as hedging instruments for regulatory purposes Current $ 11 $ 5 $ 1 $ 20 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Current 3 3 — 24 Non-current 1 — — 4 Interest rate derivatives: Current — 17 — 20 Non-current — 67 — 59 Total derivatives designated as hedging instruments in cash flow and fair value hedges 4 87 — 107 Energy-related derivatives not designated as hedging instruments Current 5 2 7 8 Non-current 1 — 1 2 Total derivatives not designated as hedging instruments 6 2 8 10 Gross amounts recognized 21 94 9 137 Gross amounts offset (a) 7 (10) 12 (50) Net amounts recognized in the Balance Sheets (b) $ 28 $ 84 $ 21 $ 87 (a) Gross amounts offset includes cash collateral held on deposit in broker margin accounts of $17 million and $62 million at December 31, 2024 and 2023, respectively. (b) Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives for all periods presented. At December 31, 2024 and 2023, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivative instruments designated as regulatory hedging instruments and deferred were as follows: Regulatory Hedge Unrealized Gain (Loss) Recognized in the Balance Sheets Derivative Category and Balance Sheet Southern Alabama Georgia Mississippi Southern Company Gas (in millions) At December 31, 2024: Energy-related derivatives: Other regulatory assets, current $ (61) $ (23) $ (26) $ (11) $ (1) Other regulatory assets, deferred (5) — — (5) — Other regulatory liabilities, current 8 4 — — 4 Other regulatory liabilities, deferred 8 3 4 1 — Total energy-related derivative gains (losses) $ (50) $ (16) $ (22) $ (15) $ 3 At December 31, 2023: Energy-related derivatives: Other regulatory assets, current $ (180) $ (67) $ (80) $ (25) $ (8) Other regulatory assets, deferred (87) (32) (33) (22) — Other regulatory liabilities, current 9 4 — 1 4 Other regulatory liabilities, deferred 1 — 1 — — Total energy-related derivative gains (losses) $ (257) $ (95) $ (112) $ (46) $ (4) For the years ended December 31, 2024, 2023, and 2022, the pre-tax effects of cash flow and fair value hedge accounting on AOCI for the applicable Registrants were as follows: Gain (Loss) From Derivatives Recognized in OCI 2024 2023 2022 (in millions) Southern Company Cash flow hedges: Energy-related derivatives $ (7) $ (81) $ 3 Interest rate derivatives 23 (12) 46 Foreign currency derivatives (40) 14 (105) Fair value hedges (*) : Foreign currency derivatives 16 21 (24) Total $ (8) $ (58) $ (80) Georgia Power Cash flow hedges: Interest rate derivatives $ 24 $ (2) $ 31 Mississippi Power Cash flow hedges: Interest rate derivatives $ 7 $ — $ — Southern Power Cash flow hedges: Energy-related derivatives $ (1) $ (18) $ (15) Foreign currency derivatives (40) 14 (105) Total $ (41) $ (4) $ (120) Southern Company Gas Cash flow hedges: Energy-related derivatives $ (6) $ (63) $ 18 Interest rate derivatives (5) — — Total $ (11) $ (63) $ 18 (*) Represents amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded in OCI. The pre-tax effects of interest rate derivatives designated as cash flow hedging instruments on AOCI were immaterial for Alabama Power for the years ended December 31, 2023 and 2022. The pre-tax effects of cash flow and fair value hedge accounting on income for the years ended December 31, 2024, 2023, and 2022 were as follows: Gain (Loss) Statements of Income Location Derivative Category 2024 2023 2022 (in millions) Southern Company Cost of natural gas Energy-related cash flow hedges $ (40) $ (44) $ 37 Other operations and maintenance Energy-related cash flow hedges (2) (2) — Depreciation and amortization Energy-related cash flow hedges (6) (23) (5) Interest expense, net of amounts capitalized Interest rate cash flow hedges (16) (35) (25) Foreign currency cash flow hedges (12) (11) (19) Interest rate fair value hedges (4) 37 (291) Other income (expense), net Foreign currency cash flow hedges (33) 19 (83) Foreign currency fair value hedges 2 69 (106) Amount excluded from effectiveness testing recognized in earnings (16) (21) 24 Southern Power Depreciation and amortization Energy-related cash flow hedges $ (6) $ (23) $ (5) Interest expense, net of amounts capitalized Foreign currency cash flow hedges (12) (11) (19) Other income (expense), net Foreign currency cash flow hedges (33) 19 (83) Southern Company Gas Cost of natural gas Energy-related cash flow hedges $ (40) $ (44) $ 37 Other operations and maintenance Energy-related cash flow hedges (2) (2) — Interest expense, net of amounts capitalized Interest rate cash flow hedges (1) (19) (4) Interest rate fair value hedges (5) 6 (86) The pre-tax effects of cash flow hedge accounting on income for interest rate derivatives were immaterial for the traditional electric operating companies for all years presented. At December 31, 2024 and 2023, the following amounts were recorded on the balance sheets related to cumulative basis adjustments for fair value hedges: Carrying Amount of Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item Balance Sheet Location of Hedged Items At December 31, 2024 At December 31, 2023 At December 31, 2024 At December 31, 2023 (in millions) (in millions) Southern Company Long-term debt $ (2,936) $ (3,024) $ 242 $ 235 Southern Company Gas Long-term debt $ (422) $ (427) $ 75 $ 70 The pre-tax effects of energy-related derivatives not designated as hedging instruments on the statements of income of Southern Company and Southern Company Gas for the years ended December 31, 2024, 2023, and 2022 were as follows: Gain (Loss) Derivatives in Non-Designated Hedging Relationships Statements of Income Location 2024 2023 2022 (in millions) Energy-related derivatives Natural gas revenues (*) $ — $ — $ (11) Cost of natural gas 94 59 (65) Total derivatives in non-designated hedging relationships $ 94 $ 59 $ (76) (*) Excludes the impact of weather derivatives recorded in natural gas revenues of $12 million, $15 million, and $(7) million for 2024, 2023 and 2022, respectively, as they are accounted for based on intrinsic value rather than fair value. The pre-tax effects of energy-related derivatives not designated as hedging instruments were immaterial for all other Registrants for all years presented. Contingent Features The Registrants do not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. There are certain derivatives that could require collateral, but not accelerated payment, in the event of various credit rating changes of certain Southern Company subsidiaries. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. At December 31, 2024, the Registrants had no collateral posted with derivative counterparties to satisfy these arrangements. For Southern Company, the fair value of foreign currency derivative liabilities and interest rate derivative liabilities with contingent features, and the maximum potential collateral requirements arising from the credit-risk-related contingent features at a rating below BBB- and/or Baa3, was $72 million at December 31, 2024. For Southern Power, the fair value of foreign currency derivative liabilities with contingent features, and the maximum potential collateral requirements arising from the credit-risk-related contingent features at a rating below BBB- and/or Baa3, was $24 million at December 31, 2024. For the traditional electric operating companies and Southern Power, energy-related derivative liabilities with contingent features and the maximum potential collateral requirements arising from the credit-risk-related contingent features, at a rating below BBB- and/or Baa3, were immaterial a t December 31, 2024. The maximum potential collateral requirements arising from the credit-risk-related contingent features for the traditional electric operating companies and Southern Power include certain agreements that could require collateral in the event that one or more Southern Company power pool participants has a credit rating change to below investment grade. Alabama Power and Southern Power maintain accounts with certain regional transmission organizations to facilitate financial derivative transactions, and they may be required to post collateral based on the value of the positions in these accounts and the associated margin requirements. At December 31, 2024, cash collateral posted in these accounts was immaterial for Alabama Power and Southern Power. Southern Company Gas maintains accounts with brokers or the clearing houses of certain exchanges to facilitate financial derivative transactions. Based on the value of the positions in these accounts and the associated margin requirements, Southern Company Gas may be required to deposit cash into these accounts. At December 31, 2024, cash collateral held on deposit in broker margin accounts was $17 million. The Registrants are exposed to losses related to financial instruments in the event of counterparties' nonperformance. The Registrants generally enter into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's, S&P, or Fitch or with counterparties who have posted collateral to cover potential credit exposure. The Registrants have also established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate their exposure to counterparty credit risk. Southern Company Gas uses established credit policies to determine and monitor the creditworthiness of counterparties, including requirements to post collateral or other credit security, as well as the quality of pledged collateral. Collateral or credit security is most often in the form of cash or letters of credit from an investment-grade financial institution, but may also include cash or U.S. government securities held by a trustee. Prior to entering a physical transaction, Southern Company Gas assigns its counterparties an internal credit rating and credit limit based on the counterparties' Moody's, S&P, and Fitch ratings, commercially available credit reports, and audited financial statements. Southern Company Gas may require counterparties to pledge additional collateral when deemed necessary. Southern Company Gas utilizes netting agreements whenever possible to mitigate exposure to counterparty credit risk. Netting agreements enable Southern Company Gas to net certain assets and liabilities by counterparty across product lines and against cash collateral, provided the netting and cash collateral agreements include such provisions. While the amounts due from, or owed to, counterparties are settled net, they are recorded on a gross basis on the balance sheet as energy marketing receivables and energy marketing payables. The Registrants do not anticipate a material adverse effect on their respective financial statements as a result of counterparty nonperformance.

ACQUISITIONS AND DISPOSITIONS

ACQUISITIONS AND DISPOSITIONS	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
ACQUISITIONS AND DISPOSITIONS	ACQUISITIONS AND DISPOSITIONS Alabama Power In 2022, Alabama Power completed its acquisition of the Calhoun Generating Station, which was accounted for as an asset acquisition. The total purchase price was $179 million, of which $171 million was related to net assets recorded within property, plant, and equipment on the balance sheet and reflected in property additions within the investing section of the statement of cash flows. The remainder primarily related to fossil fuel stock and materials and supplies. See Note 2 under "Alabama Power – Rate CNP New Plant" for additional information. On October 24, 2024, Alabama Power entered into an agreement to acquire all of the equity interests in Tenaska Alabama Partners, L.P., which owns and operates the Lindsay Hill Generating Station. See Note 2 under "Alabama Power – Petition for Certificate of Convenience and Necessity" for additional information. Mississippi Power On November 8, 2024, Mississippi Power entered into an agreement with FP&L to acquire FP&L's 50% ownership interest in Plant Daniel Units 1 and 2. See Note 2 under "Mississippi Power – Plant Daniel" for additional information. Southern Power Southern Power's acquisition-related costs for the projects discussed under "Asset Acquisitions" and "Construction Projects" were not material for any of the years presented. Asset Acquisitions During 2023, Southern Power acquired the Millers Branch and South Cheyenne projects, as discussed further under "Construction Projects" below, with an aggregate purchase price of $193 million. There were no asset acquisitions during 2024 and 2022. Construction Projects During 2024, Southern Power completed construction of and placed in service the 150-MW South Cheyenne solar facility. In addition, Southern Power continued construction of the 200-MW first phase and began construction of the 180-MW second phase and the 132-MW third phase of the Millers Branch solar facility. At December 31, 2024, the total cost of construction incurred for the Millers Branch project was $292 million, which is primarily included in CWIP. Project Resource Approximate Nameplate Capacity ( MW ) Location Actual/Projected COD PPA Contract Period Projects Under Construction at December 31, 2024 Millers Branch Phase I Solar 200 Haskell County, TX Fourth quarter 2025 20 years Phase II Solar 180 Haskell County, TX Second quarter 2026 15 years Phase III Solar 132 Haskell County, TX Fourth quarter 2026 15 years Projects Completed During 2024 South Cheyenne Solar 150 Laramie County, WY April 2024 20 years Projects Completed During 2022 Garland Solar Storage (a) Battery energy storage 88 Kern County, CA September 2021 through February 2022 (b) 20 years Tranquillity Solar Storage (a) Battery energy storage 72 Fresno County, CA November 2021 through March 2022 (c) 20 years (a) Southern Power consolidates each project's operating results in its financial statements and the tax equity partner and two other partners each own a noncontrolling interest. See Note 9 under "Lessor" for additional information. (b) The facility has a total capacity of 88 MWs, of which 73 MWs were placed in service in 2021 and 15 MWs were placed in service in 2022. (c) The facility has a total capacity of 72 MWs, of which 32 MWs were placed in service in 2021 and 40 MWs were placed in service in 2022. Development Projects In November 2024, Southern Power committed to a development project to repower 200 MWs of the 299-MW Kay Wind facility located in Kay County, Oklahoma. The output of the project is contracted under an amended 20-year PPA with commercial operation projected to occur in the third quarter 2026. Southern Company Gas In September 2022, certain affiliates of Southern Company Gas entered into agreements to sell two natural gas storage facilities located in California and Texas for an aggregate purchase price of $186 million, plus working capital and certain other adjustments. The sale of the Texas facility was completed in November 2022 and the sale of the California facility was completed in September 2023. Both sales resulted in an immaterial loss. Completion of the sale of the Texas facility was subject to release of a Southern Company Gas parent guarantee, which was executed in October 2022 and, as a result, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) in the fourth quarter 2022. Neither of these dispositions, both individually and combined, represented a strategic shift in operations for Southern Company Gas that has, or is expected to have, a major effect on its operations and financial results; therefore, none of the assets related to the sales were classified as discontinued operations for the applicable periods presented.

SEGMENT AND RELATED INFORMATION

SEGMENT AND RELATED INFORMATION	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
SEGMENT AND RELATED INFORMATION	SEGMENT AND RELATED INFORMATION The Registrants adopted ASU 2023-07 and applied the guidance retrospectively effective for the fiscal year beginning January 1, 2024. See Note 1 under "Recently Adopted Accounting Standards" for additional information. The CODM at Southern Company, the traditional electric operating companies, and Southern Company Gas is the chairman, president, and chief executive officer of such Registrant. Southern Power's CODM consists of the chairman and chief executive officer and the president. The CODMs assess segment performance using net income that is reflected on the Registrants' respective statements of income as net income attributable to the registrant, net income after dividends on preferred stock, or net income, as applicable. The CODMs use net income in the annual budget and forecasting process and consider budget versus actual results on a monthly basis when making decisions about the allocation of resources. Unless noted below, the CODMs do not utilize segment asset information. Southern Company Southern Company's reportable business segments are the sale of electricity by the traditional electric operating companies, the sale of electricity in the competitive wholesale market by Southern Power, and the sale of natural gas and other complementary products and services by Southern Company Gas. While the traditional electric operating companies represent three separate operating segments, they are vertically integrated utilities providing electric service to retail customers, as well as wholesale customers, in the Southeast and have been aggregated into one reportable segment. Revenues from sales by Southern Power to the traditional electric operating companies were $371 million, $537 million, and $875 million in 2024, 2023, and 2022, respectively. Revenues from sales of natural gas from Southern Company Gas to the traditional electric operating companies and Southern Power were immaterial for all periods presented. The "All Other" column includes the Southern Company parent entity, which does not allocate operating expenses to business segments. Also, this category includes segments below the quantitative threshold for separate disclosure. These segments include providing distributed energy and resilience solutions and deploying microgrids for commercial, industrial, governmental, and utility customers, as well as investments in telecommunications. All other inter-segment revenues are not material. Southern Company's CODM utilizes segment net income, including variances to budget and forecasts, to assess performance and is not provided with segment expense information. To achieve the consolidated net income goal, Southern Company's CODM sets net income expectations for each operating segment, which is expected to monitor its expenses in order to achieve its assigned net income target. Therefore, Southern Company has no reportable significant segment expenses. Financial data for business segments and products and services for the years ended December 31, 2024, 2023, and 2022 was as follows: Electric Utilities Traditional Southern Eliminations Total Southern Company Gas Total Reportable Segments All Eliminations Consolidated (in millions) 2024 Operating revenues $ 19,977 $ 2,014 $ (388) $ 21,603 $ 4,456 $ 26,059 $ 843 $ (178) $ 26,724 Other segment items (a)(b)(c)(d) 10,057 1,060 (388) 10,729 2,613 13,342 802 (149) 13,995 Depreciation and amortization (e) 3,512 522 — 4,034 650 4,684 71 — 4,755 Earnings from equity method investments 8 — — 8 146 154 (17) 2 139 Interest expense 1,255 117 — 1,372 341 1,713 1,030 — 2,743 Income taxes (benefit) 1,016 (13) — 1,003 258 1,261 (292) — 969 Segment net income (loss) (b)(c)(d)(e)(f) $ 4,145 $ 328 $ — $ 4,473 $ 740 $ 5,213 $ (785) $ (27) $ 4,401 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 5,017 $ 144 $ — $ 5,161 Total assets 105,577 12,653 (1,025) 117,205 26,177 143,382 2,371 (573) 145,180 2023 Operating revenues $ 18,358 $ 2,189 $ (549) $ 19,998 $ 4,702 $ 24,700 $ 718 $ (165) $ 25,253 Other segment items (a)(c)(g)(h) 9,643 1,187 (549) 10,281 3,124 13,405 699 (150) 13,954 Depreciation and amortization 3,361 504 — 3,865 582 4,447 78 — 4,525 Earnings from equity method investments (1) — — (1) 140 139 5 — 144 Interest expense 1,145 129 — 1,274 310 1,584 879 (17) 2,446 Income taxes (benefit) 571 12 — 583 211 794 (298) — 496 Segment net income (loss) (c)(f)(g)(h) $ 3,637 $ 357 $ — $ 3,994 $ 615 $ 4,609 $ (635) $ 2 $ 3,976 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 5,017 $ 144 $ — $ 5,161 Total assets 100,429 12,761 (545) 112,645 25,083 137,728 2,446 (843) 139,331 2022 Operating revenues $ 20,408 $ 3,369 $ (904) $ 22,873 $ 5,962 $ 28,835 $ 593 $ (149) $ 29,279 Other segment items (a)(c)(i)(j) 12,820 2,341 (904) 14,257 4,536 18,793 771 (138) 19,426 Depreciation and amortization 2,513 516 — 3,029 559 3,588 75 — 3,663 Earnings from equity method investments — — — — 148 148 3 — 151 Interest expense 929 138 — 1,067 263 1,330 694 (2) 2,022 Income taxes (benefit) 828 20 — 848 180 1,028 (233) — 795 Segment net income (loss) (c)(f)(i)(j) $ 3,318 $ 354 $ — $ 3,672 $ 572 $ 4,244 $ (711) $ (9) $ 3,524 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 5,017 $ 144 $ — $ 5,161 Total assets 95,861 13,081 (659) 108,283 24,621 132,904 2,665 (678) 134,891 (a) Primarily consists of fuel, purchased power, cost of natural gas, cost of other sales, other operations and maintenance, taxes other than income taxes, charges (credits) to income for estimated probable losses, losses (gains) on asset dispositions, impairment charges, AFUDC equity, non-service cost-related retirement benefits income, and net income (loss) attributable to noncontrolling interests. (b) For the traditional electric operating companies, includes a pre-tax impairment loss at Alabama Power of $36 million ($27 million after tax) related to Alabama Power discontinuing the development of a multi-use commercial facility. See Note 1 under "Impairment of Long-Lived Assets" for additional information. (c) For the traditional electric operating companies, includes pre-tax charges (credits) to income at Georgia Power for the estimated probable loss associated with the construction and completion of Plant Vogtle Units 3 and 4 of $(21) million ($(16) million after tax) in 2024, $(68) million ($(50) million after tax) in 2023, and $183 million ($137 million after tax) in 2022. See Note 2 under "Georgia Power – Nuclear Construction" for additional information. (d) For the traditional electric operating companies, includes a pre-tax gain at Georgia power of approximately $114 million ($84 million after tax) related to the sale of transmission line assets under the integrated transmission system agreement. See Note 2 under "Georgia Power – Transmission Asset Sales" for additional information. (e) For Southern Power, includes pre-tax accelerated depreciation of $9 million ($7 million after tax) related to the commitment to repower 200 MWs of the Kay Wind facility. See Note 15 under "Southern Power – Development Projects" for additional information. (f) Attributable to Southern Company. (g) For Southern Power, includes an $18 million pre-tax loss recovery ($9 million after tax and partnership allocations) related to an arbitration award and a $16 million pre-tax gain ($12 million after tax) on the sale of spare parts. See Note 3 under "General Litigation Matters – Southern Power" for additional information. (h) For Southern Company Gas, includes pre-tax charges totaling approximately $96 million ($72 million after tax) associated with the disallowance of certain capital investments at Nicor Gas. See Note 2 under "Southern Company Gas" for additional information. (i) For Southern Company Gas, includes pre-tax impairment charges totaling approximately $131 million ($99 million after tax) related to the sale of natural gas storage facilities. See Note 15 under "Southern Company Gas" for additional information. (j) For the "All Other" column, includes a $119 million goodwill impairment loss (pre-tax and after tax) at PowerSecure. See Note 1 under "Goodwill and Other Intangible Assets" for additional information. Products and Services Electric Utilities' Revenues Year Retail Wholesale Other Total (in millions) 2024 $ 17,790 $ 2,431 $ 1,382 $ 21,603 2023 16,343 2,467 1,188 19,998 2022 18,197 3,641 1,035 22,873 Southern Company Gas' Revenues Year Gas Gas All Other Total (in millions) 2024 $ 3,899 $ 516 $ 41 $ 4,456 2023 4,090 548 64 4,702 2022 5,240 638 84 5,962 Traditional Electric Operating Companies Each of the traditional electric operating companies' single reportable business segment is the sale of electricity. Revenues from products and services of the traditional electric operating companies are segregated into retail, wholesale, and other as reflected on their statements of income. Alabama Power and Georgia Power have identified utility operations and maintenance expenses as significant segment expenses provided to their CODMs. Utility operations and maintenance expenses is calculated as other operations and maintenance, as reflected on the statements of income, less expenses from unregulated products and services, losses (gains) on asset dispositions, impairment charges, and amortization of cloud software. Alabama Power's utility operations and maintenance expenses are disaggregated into expenses related to Rate RSE and Rate CNP Compliance, which are not applicable to Georgia Power. See Note 2 under "Alabama Power" for additional information. Financial data for Alabama Power's and Georgia Power's significant segment expenses and other segment information for the years ended December 31, 2024, 2023, and 2022 was as follows: 2024 2023 2022 (in millions) Alabama Power Operating revenues $ 7,554 $ 7,050 $ 7,817 Utility operations and maintenance Rate RSE expenses 1,480 1,421 1,645 Rate CNP Compliance expenses 279 254 237 Total utility operations and maintenance 1,759 1,675 1,882 Other segment items (a)(b) 2,125 2,098 2,915 Depreciation and amortization 1,459 1,401 875 Interest expense 448 425 382 Income taxes 360 81 423 Segment net income (b) $ 1,403 $ 1,370 $ 1,340 Capital expenditures $ 2,114 $ 2,159 $ 2,206 Georgia Power Operating revenues $ 11,331 $ 10,118 $ 11,584 Utility operations and maintenance 2,210 1,901 2,237 Other segment items (a)(c)(d) 3,476 3,382 5,249 Depreciation and amortization 1,774 1,681 1,430 Interest expense 725 626 485 Income taxes 603 448 370 Segment net income (c)(d) $ 2,543 $ 2,080 $ 1,813 Capital expenditures $ 5,355 $ 5,394 $ 4,219 (a) Primarily consists of fuel, purchased power, expenses from unregulated products and services, losses (gains) on asset dispositions, impairment charges, amortization of cloud software, taxes other than income taxes, charges (credits) to income for estimated probable losses, AFUDC equity, and non-service cost-related retirement benefits income. Also includes earnings from equity method investments, which were immaterial for all periods presented. (b) For 2024, includes a pre-tax impairment loss of $36 million ($27 million after tax) related to Alabama Power discontinuing the development of a multi-use commercial facility. See Note 1 under "Impairment of Long-Lived Assets" for additional information. (c) Includes pre-tax charges (credits) to income for the estimated probable loss associated with the construction and completion of Plant Vogtle Units 3 and 4 of $(21) million ($(16) million after tax) in 2024, $(68) million ($(50) million after tax) in 2023, and $183 million ($137 million after tax) in 2022. See Note 2 under "Georgia Power – Nuclear Construction" for additional information. (d) For 2024, includes a pre-tax gain of approximately $114 million ($84 million after tax) related to the sale of transmission line assets under the integrated transmission system agreement. See Note 2 under "Georgia Power – Transmission Asset Sales" for additional information. Mississippi Power's CODM utilizes segment expense information in the form of variances to budget to assess performance; therefore, Mississippi Power has no reportable significant segment expenses. Mississippi Power's segment information for revenues, depreciation and amortization, interest expense, and income taxes is reflected on its statements of income. Mississippi Power's earnings from equity method investments are included in other income (expense), net on its statements of income and were immaterial for all periods presented. Other segment items primarily consist of fuel and purchased power, other operations and maintenance, taxes other than income taxes, and non-service cost-related retirement benefits income and totaled $0.9 billion, $1.0 billion, and $1.3 billion for the years ended December 31, 2024, 2023, and 2022, respectively. Southern Power Southern Power's single reportable business segment is the sale of electricity in the competitive wholesale market. Substantially all of Southern Power's revenues from products and services are reflected as wholesale on its consolidated statements of income. Southern Power's CODM utilizes segment expense information in the form of variances to budget to assess performance; therefore, Southern Power has no reportable significant segment expenses. Southern Power's segment information for revenues, depreciation and amortization, interest expense, and income taxes (benefit) is reflected on its consolidated statements of income. Southern Power had no earnings from equity method investments for any period presented. Other segment items primarily consist of fuel, purchased power, other operations and maintenance, taxes other than income taxes, losses (gains) on asset dispositions, and net income (loss) attributable to noncontrolling interests and totaled $1.1 billion, $1.2 billion, and $2.3 billion for the years ended December 31, 2024, 2023, and 2022, respectively. Southern Company Gas Southern Company Gas manages its business through three reportable segments – gas distribution operations, gas pipeline investments, and gas marketing services. The non-reportable segments are combined and presented as all other. See Note 15 under "Southern Company Gas" for additional information on the disposition activities described herein. The gas distribution operations segment is the largest component of Southern Company Gas' business and includes natural gas local distribution utilities that construct, manage, and maintain intrastate natural gas pipelines and gas distribution facilities in four states. The gas pipeline investments segment consists of joint ventures in natural gas pipeline investments including a 50% interest in SNG and a 50% joint ownership interest in the Dalton Pipeline. These natural gas pipelines enable the provision of diverse sources of natural gas supplies to the customers of Southern Company Gas. See Notes 5 and 7 for additional information. The gas marketing services segment provides natural gas marketing to end-use customers primarily in Georgia and Illinois through SouthStar. The "All Other" column includes segments and subsidiaries that fall below the quantitative threshold for separate disclosure, including storage and fuels operations. The "All Other" column included a natural gas storage facility in Texas through its sale in November 2022 and a natural gas storage facility in California through its sale in September 2023. Southern Company Gas' CODM utilizes segment expense information in the form of variances to budget to assess performance; therefore, Southern Company Gas has no reportable significant segment expenses. Financial data for business segments for the years ended December 31, 2024, 2023, and 2022 was as follows: Gas Distribution Operations Gas Pipeline Investments Gas Marketing Services Total Reportable Segments All Other Eliminations Consolidated (in millions) 2024 Operating revenues $ 3,899 $ 32 $ 516 $ 4,447 $ 23 $ (14) $ 4,456 Other segment items (a) 2,236 6 356 2,598 29 (14) 2,613 Depreciation and amortization 630 5 14 649 1 — 650 Earnings from equity method investments — 146 — 146 — — 146 Interest expense 311 35 3 349 (8) — 341 Income taxes 172 31 41 244 14 — 258 Segment net income (loss) $ 550 $ 101 $ 102 $ 753 $ (13) $ — $ 740 Total assets $ 24,067 $ 1,573 $ 1,696 $ 27,336 $ 10,047 $ (11,206) $ 26,177 2023 Operating revenues $ 4,105 $ 32 $ 548 $ 4,685 $ 36 $ (19) $ 4,702 Other segment items (a)(b) 2,702 5 402 3,109 34 (19) 3,124 Depreciation and amortization 561 5 15 581 1 — 582 Earnings from equity method investments — 140 — 140 — — 140 Interest expense 275 32 3 310 — — 310 Income taxes 126 32 37 195 16 — 211 Segment net income (loss) (b) $ 441 $ 98 $ 91 $ 630 $ (15) $ — $ 615 Total assets $ 22,906 $ 1,534 $ 1,615 $ 26,055 $ 9,675 $ (10,647) $ 25,083 2022 Operating revenues $ 5,267 $ 32 $ 638 $ 5,937 $ 55 $ (30) $ 5,962 Other segment items (a)(c) 3,907 6 488 4,401 165 (30) 4,536 Depreciation and amortization 516 5 16 537 22 — 559 Earnings from equity method investments — 148 — 148 — — 148 Interest expense 229 27 3 259 4 — 263 Income taxes (benefit) 145 35 37 217 (37) — 180 Segment net income (loss) (c) $ 470 $ 107 $ 94 $ 671 $ (99) $ — $ 572 Total assets $ 22,040 $ 1,577 $ 1,616 $ 25,233 $ 8,943 $ (9,555) $ 24,621 (a) Primarily consists of cost of natural gas, other operations and maintenance, taxes other than income taxes, impairment charges, estimated loss on regulatory disallowance, AFUDC equity, and non-service cost-related retirement benefits income. (b) For gas distribution operations, includes pre-tax charges totaling approximately $96 million ($72 million after tax) associated with the disallowance of certain capital investments at Nicor Gas. See Note 2 under "Southern Company Gas" for additional information. (c) For the "All Other" column, includes pre-tax impairment charges totaling approximately $131 million ($99 million after tax) related to the sale of natural gas storage facilities. See Note 15 under "Southern Company Gas" for additional information.

VALUATION AND QUALIFYING ACCOUN

VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
VALUATION AND QUALIFYING ACCOUNTS	SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS FOR THE YEARS ENDED DECEMBER 31, 2024, 2023, AND 2022 Additions Description Balance at Beginning of Period Charged to Income Charged to Other Accounts Deductions (*) Balance at End of Period (in millions) Provision for uncollectible accounts: Southern Company 2024 $ 68 $ 119 $ (1) $ 112 $ 74 2023 71 87 3 93 68 2022 78 71 (1) 77 71 Alabama Power 2024 $ 16 $ 26 $ — $ 20 $ 22 2023 14 16 — 14 16 2022 14 10 — 10 14 Georgia Power 2024 $ 4 $ 51 $ — $ 40 $ 15 2023 3 26 — 25 4 2022 2 21 — 20 3 Mississippi Power 2024 $ 1 $ 2 $ — $ 2 $ 1 2023 1 2 — 2 1 2022 1 1 1 2 1 Southern Power 2024 $ 1 $ (1) $ — $ — $ — 2023 1 — — — 1 2022 5 (2) — 2 1 Southern Company Gas 2024 $ 44 $ 39 $ (1) $ 49 $ 33 2023 50 43 3 52 44 2022 39 55 — 44 50 (*) Deductions represent write-offs of accounts considered to be uncollectible, less recoveries of amounts previously written off. SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS (CONTINUED) FOR THE YEARS ENDED DECEMBER 31, 2024, 2023, AND 2022 Additions Description Balance at Beginning of Period Charged to Income Charged to Other Accounts Deductions Balance at End of Period (in millions) Tax valuation allowance (net state): Southern Company (a)(b)(c) 2024 $ 168 $ 97 $ 3 $ — $ 268 2023 207 (14) (25) — 168 2022 169 68 (30) — 207 Georgia Power (b) 2024 $ 60 $ 97 $ (33) $ — $ 124 2023 98 (15) (23) — 60 2022 58 70 (30) — 98 Mississippi Power (c) 2024 $ 32 $ — $ — $ — $ 32 2023 32 — — — 32 2022 32 — — — 32 Southern Power (c) 2024 $ 21 $ — $ — $ — $ 21 2023 21 — — — 21 2022 21 — — — 21 Southern Company Gas (c) 2024 $ 5 $ — $ (1) $ — $ 4 2023 7 — (2) — 5 2022 7 — — — 7 (a) In 2024, Southern Company established a valuation allowance for certain Georgia state tax credits expected to expire prior to being fully utilized. (b) In 2018, Georgia Power established a valuation allowance for certain Georgia state tax credits expected to expire prior to being fully utilized, which has been adjusted in subsequent years as a result of changes in projected state taxable income. (c) Associated with a state net operating loss carryforward expected to expire prior to being fully utilized. See Note 10 to the financial statements in Item 8 herein for additional information.

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Kimberly S. Greene [Member]
Trading Arrangements, by Individual
Name	Kimberly S. Greene
Title	Chairman, President, and Chief Executive Officer, Georgia Power
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 4, 2024
Expiration Date	March 3, 2026
Arrangement Duration	484 days
Aggregate Available	45,348
Stanley W. Connally, Jr. [Member]
Trading Arrangements, by Individual
Name	Stanley W. Connally, Jr.
Title	Executive Vice President and Chief Operating Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 12, 2024
Expiration Date	March 17, 2026
Arrangement Duration	490 days
Aggregate Available	12,500

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Risk Management and Strategy Although many of the networks are segmented, overall network security is a centralized shared service across the Southern Company system, led by the TSO and the CISO. Recognizing that no single technology, process, or business control can effectively prevent or mitigate all risks related to cyber threats, multiple technologies, processes, and controls, all working independently but as part of a cohesive strategy, are employed to reduce risk. Southern Company system exposure and defenses are regularly tested through auditing, penetration testing, vulnerability testing, and other exercises designed to assess effectiveness. The Southern Company system emphasizes both security and resiliency through business assurance and incident response plans designed to identify, evaluate, and remediate incidents when they occur. A 24/7 security operations center is also utilized, which facilitates real-time situational awareness across the cyber-threat environment, and a robust insider threat protection program that leverages cross-function information sharing to assess insider threat activity is employed. The Southern Company system regularly reviews and updates its plans, policies, and technologies and conducts regular training exercises and crisis management preparedness activities to test their effectiveness. In addition, a security awareness program for the Southern Company system's employees has also been implemented, which is designed to educate and train employees at least annually, or more often as needed, about risks inherent to human interaction with information and operational technology. The Southern Company system's cybersecurity program is increasingly leveraging intelligence-sharing capabilities about emerging threats within the energy industry, across other industries, with specialized vendors, and through public-private partnerships with U.S. government intelligence agencies. By engaging with both the Electricity Information Sharing and Analysis Center and the Downstream Natural Gas Information Sharing and Analysis Center, the Southern Company system benefits from quality analysis and rapid sharing of security information across the energy sector. Such intelligence helps to allow for better detection and prevention of emerging cyber threats before they materialize. Just as it tests its policies and plans internally, the Southern Company system also engages in external exercises such as the bi-annual GridEx Security Exercise to evaluate and address the preparedness of the industry as a whole. Many cybersecurity policies and standards across the Southern Company system are governed by multiple regulatory requirements. Portions of these policies and standards are audited by the FERC, the Transportation Security Administration, and the NRC, as appropriate, and are periodically evaluated by third parties such as cybersecurity insurance carriers. Certain members of senior management have high-level security clearances to facilitate access to critical information, and the Southern Company system participates in pilot programs with industry and the U.S. government to share additional information and strengthen cybersecurity and business resiliency. The Southern Company system also employs systems and processes designed to oversee, identify, and reduce the potential impact of a security incident at a third-party vendor, service provider, or customer or otherwise implicating the third-party technology and systems used. Among other things, the Southern Company system has established a Vendor Security Incident Working Group to address such third-party security incidents, including following up with the third party as appropriate and taking steps to mitigate any impact to systems. The Vendor Security Incident Working Group includes members of the internal cybersecurity teams to address any incidents that may invoke the CIRP. Additionally, the Southern Company system typically imposes contractual obligations on vendors and other third-party business partners related to privacy, confidentiality, and data security based on their access to the Southern Company system's data and systems. The Southern Company system also maintains insurance coverage for cyber incidents; the scope of coverage and fitness of coverage is evaluated each year. Incident Response The Southern Company system has adopted a CIRP that applies in the event of certain cybersecurity threats or incidents to provide a standardized guide for responding to security incidents. The CIRP sets out a coordinated approach to investigating, containing, documenting, and mitigating incidents, including reporting findings and keeping senior management and other key stakeholders informed and involved as appropriate. In general, the incident response process follows the National Institute of Standards and Technology guidance and focuses on four phases: preparation; detection and analysis; containment, eradication, and recovery; and post-incident remediation. The CIRP is reviewed periodically to help ensure its applicability to any changing needs or circumstances and to provide users a tactical tool to effectively respond to incidents. The CIRP applies to all Southern Company system personnel (including third-party contractors, vendors, and partners) that perform functions or services requiring access to secure Southern Company system information and to all devices and network services that are owned or managed by the Southern Company system. A full tabletop exercise is performed at least annually, including stakeholders from business units beyond technology security, such as power delivery, legal, compliance, risk management, and corporate communications. In addition, the Southern Company system participates in sector-level and cross-sector exercises led by industry or the U.S. government. In the event of an incident, the technology security organization, the legal organization, and other stakeholders frequently review lessons learned after an incident has been remediated.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Although many of the networks are segmented, overall network security is a centralized shared service across the Southern Company system, led by the TSO and the CISO. Recognizing that no single technology, process, or business control can effectively prevent or mitigate all risks related to cyber threats, multiple technologies, processes, and controls, all working independently but as part of a cohesive strategy, are employed to reduce risk. Southern Company system exposure and defenses are regularly tested through auditing, penetration testing, vulnerability testing, and other exercises designed to assess effectiveness.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Board of Directors The Southern Company Board of Directors (Board), along with certain committees (primarily the Audit Committee of the Board) oversees the Southern Company system's enterprise risk management process. The Board devotes significant time and attention to overseeing cybersecurity risk, and the Southern Company system's approach to cybersecurity governance establishes oversight throughout the enterprise. The Board has delegated the primary responsibility to oversee cybersecurity matters to the Business Security and Resiliency Committee (BSRC) of the Board. Having a committee like the BSRC, focused on and dedicated to security, is a strong governance practice. Comprised solely of independent members of the Board, the BSRC is charged with oversight of risks related to cybersecurity, physical security, and operational resiliency. The BSRC includes directors with an understanding of cyber issues. The BSRC meets at every regular Board meeting and when needed in the event of a specific threat or emerging issue. The Chair of the BSRC regularly reports to the Board in connection with key matters the BSRC considered. The BSRC routinely receives presentations on a range of topics, including the threat environment and vulnerabilities and risks, policies, practices, technology trends, and regulatory developments, from the Chief Information Security Officer (CISO) and the legal organization and, as needed, the Chief Information Officer (CIO). The CISO reports to the BSRC at each regular committee meeting. Protocols have been established by which certain cybersecurity incidents are escalated internally and, where appropriate, reported to the BSRC, and ongoing updates regarding any such incident are provided until it has been resolved. See "Incident Response" herein.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Southern Company Board of Directors (Board), along with certain committees (primarily the Audit Committee of the Board) oversees the Southern Company system's enterprise risk management process.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	Briefings to the Board on cybersecurity matters include annual briefings to the Audit Committee and the Operations, Environmental, and Safety Committee in addition to briefings to the BSRC at each of its regular meetings (at least five times annually).
Cybersecurity Risk Role of Management [Text Block]	The TSO, led by the CISO, is responsible for the implementation, monitoring, and maintenance of the cybersecurity and data protection practices across the Southern Company system. The Southern Company system also relies on a Data Privacy and Protection team in the compliance organization, as well as the internal audit organization, to work with the TSO on data protection policies and practices. Multiple experienced information security leaders with internal and external security experience responsible for various parts of the business report to the CISO, each of whom is supported by a team of trained cybersecurity professionals. In addition to these internal cybersecurity capabilities, external auditors and security companies are regularly engaged to assist with assessing, testing, identifying, and managing cybersecurity, including through penetration testing, vulnerability testing, and other technical evaluations.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Board of Directors The Southern Company Board of Directors (Board), along with certain committees (primarily the Audit Committee of the Board) oversees the Southern Company system's enterprise risk management process. The Board devotes significant time and attention to overseeing cybersecurity risk, and the Southern Company system's approach to cybersecurity governance establishes oversight throughout the enterprise. The Board has delegated the primary responsibility to oversee cybersecurity matters to the Business Security and Resiliency Committee (BSRC) of the Board. Having a committee like the BSRC, focused on and dedicated to security, is a strong governance practice. Comprised solely of independent members of the Board, the BSRC is charged with oversight of risks related to cybersecurity, physical security, and operational resiliency. The BSRC includes directors with an understanding of cyber issues. The BSRC meets at every regular Board meeting and when needed in the event of a specific threat or emerging issue. The Chair of the BSRC regularly reports to the Board in connection with key matters the BSRC considered. The BSRC routinely receives presentations on a range of topics, including the threat environment and vulnerabilities and risks, policies, practices, technology trends, and regulatory developments, from the Chief Information Security Officer (CISO) and the legal organization and, as needed, the Chief Information Officer (CIO). The CISO reports to the BSRC at each regular committee meeting. Protocols have been established by which certain cybersecurity incidents are escalated internally and, where appropriate, reported to the BSRC, and ongoing updates regarding any such incident are provided until it has been resolved. See "Incident Response" herein. Management The Southern Company system has implemented a cross-functional, risk-based, "defense-in-depth" approach to preventing, detecting, identifying, mitigating, responding to, and recovering from cybersecurity threats and incidents, while also implementing controls and procedures that provide for the prompt escalation of certain cybersecurity incidents so that decisions regarding the public disclosure and reporting of such incidents can be made by management in a timely manner. Overall network efforts are led by the CISO and the Technology Security Organization (TSO), the organization responsible for implementing, monitoring, and maintaining cybersecurity practices across the Southern Company system, and aided by the Executive Vice President of Operations and the Energy Management System and Generation organization. The CISO meets regularly with the CIO and the Chief Executive Officer and reports regularly to committees of the Board to discuss risk management measures implemented to identify and mitigate data protection and cybersecurity risks. Security and resiliency are emphasized through business assurance, enterprise risk management, and incident response plans designed to identify, evaluate, and remediate incidents when they occur. Among other things, the Cybersecurity Incident Response Plan (CIRP) establishes a team comprised of the CISO, the Deputy CISO, the Director of the Digital Defense Center, and members of the legal and compliance organizations to evaluate emerging cyber threats and escalate to executive management and business units as appropriate. Plans, policies, and technologies are regularly updated and training exercises and crisis management preparedness activities are conducted to test effectiveness. The CISO works closely with the legal and compliance organizations, as well as the relevant business units, to help ensure broad oversight of and compliance with legal, regulatory, and contractual cybersecurity requirements. The CISO has extensive cybersecurity knowledge and skills gained from over 30 years of work experience within the Southern Company system. The CISO receives reports on cybersecurity threats from a variety of sources both internally and externally on an ongoing basis and regularly reviews risk management measures implemented to identify and mitigate cybersecurity risks. Briefings to the Board on cybersecurity matters include annual briefings to the Audit Committee and the Operations, Environmental, and Safety Committee in addition to briefings to the BSRC at each of its regular meetings (at least five times annually). Internal Cybersecurity Team The TSO, led by the CISO, is responsible for the implementation, monitoring, and maintenance of the cybersecurity and data protection practices across the Southern Company system. The Southern Company system also relies on a Data Privacy and Protection team in the compliance organization, as well as the internal audit organization, to work with the TSO on data protection policies and practices. Multiple experienced information security leaders with internal and external security experience responsible for various parts of the business report to the CISO, each of whom is supported by a team of trained cybersecurity professionals. In addition to these internal cybersecurity capabilities, external auditors and security companies are regularly engaged to assist with assessing, testing, identifying, and managing cybersecurity, including through penetration testing, vulnerability testing, and other technical evaluations.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	The CISO has extensive cybersecurity knowledge and skills gained from over 30 years of work experience within the Southern Company system.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The CISO works closely with the legal and compliance organizations, as well as the relevant business units, to help ensure broad oversight of and compliance with legal, regulatory, and contractual cybersecurity requirements. The CISO has extensive cybersecurity knowledge and skills gained from over 30 years of work experience within the Southern Company system. The CISO receives reports on cybersecurity threats from a variety of sources both internally and externally on an ongoing basis and regularly reviews risk management measures implemented to identify and mitigate cybersecurity risks. Briefings to the Board on cybersecurity matters include annual briefings to the Audit Committee and the Operations, Environmental, and Safety Committee in addition to briefings to the BSRC at each of its regular meetings (at least five times annually).
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
General	General Southern Company is the parent company of three traditional electric operating companies, as well as Southern Power, Southern Company Gas, SCS, Southern Linc, Southern Holdings, Southern Nuclear, PowerSecure, and other direct and indirect subsidiaries. The traditional electric operating companies – Alabama Power, Georgia Power, and Mississippi Power – are vertically integrated utilities providing electric service in three Southeastern states. Southern Power develops, constructs, acquires, owns, operates, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through natural gas distribution utilities, including Nicor Gas (Illinois), Atlanta Gas Light (Georgia), Virginia Natural Gas, and Chattanooga Gas (Tennessee). Southern Company Gas is also involved in several other complementary businesses including gas pipeline investments and gas marketing services. SCS, the system service company, provides, at cost, specialized services to Southern Company and its subsidiary companies. Southern Linc provides digital wireless communications for use by Southern Company and its subsidiary companies and also markets these services to the public and provides fiber optics services within the Southeast. Southern Holdings is an intermediate holding company subsidiary. Southern Nuclear operates and provides services to the Southern Company system's nuclear power plants, including Alabama Power's Plant Farley and Georgia Power's Plants Hatch and Vogtle. PowerSecure develops distributed energy and resilience solutions and deploys microgrids for commercial, industrial, governmental, and utility customers. The Registrants' financial statements reflect investments in subsidiaries on a consolidated basis. Intercompany transactions have been eliminated in consolidation. The equity method is used for investments in entities in which a Registrant has significant influence but does not have control and for VIEs where a Registrant has an equity investment but is not the primary beneficiary. Southern Power has controlling ownership in certain legal entities for which the contractual provisions represent profit-sharing arrangements because the allocations of cash distributions and tax benefits are not based on fixed ownership percentages. For these arrangements, the noncontrolling interest is accounted for under a balance sheet approach utilizing the HLBV method. The HLBV method calculates each partner's share of income based on the change in net equity the partner can legally claim in an HLBV at the end of the period compared to the beginning of the period. See "Variable Interest Entities" herein and Note 7 for additional information. The traditional electric operating companies, Southern Power, certain subsidiaries of Southern Company Gas, and certain other subsidiaries are subject to regulation by the FERC, and the traditional electric operating companies and the natural gas distribution utilities are also subject to regulation by their respective state PSCs or other applicable state regulatory agencies. As such, the respective financial statements of the applicable Registrants reflect the effects of rate regulation in accordance with GAAP and comply with the accounting policies and practices prescribed by relevant state PSCs or other applicable state regulatory agencies. The preparation of financial statements in conformity with GAAP requires the use of estimates, and the actual results may differ from those estimates. Certain prior years' data presented in the financial statements have been reclassified to conform to the current year presentation. These reclassifications had no impact on the Registrants' results of operations, financial position, or cash flows.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (ASU 2023-07), which requires entities to disclose significant segment expenses, other segment items, the title and position of the CODM, and information related to how the CODM assesses segment performance and allocates resources, among certain other required disclosures. Additionally, previous annual disclosures will be required in interim periods. The Registrants adopted ASU 2023-07 and applied the guidance retrospectively effective for the fiscal year beginning January 1, 2024. ASU 2023-07 will be applied retrospectively for the interim periods beginning January 1, 2025. See Note 16 for additional information and related disclosures.
Affiliate Transactions	Affiliate Transactions The traditional electric operating companies, Southern Power, and Southern Company Gas have agreements with SCS under which certain of the following services are rendered to them at direct or allocated cost: general executive and advisory, general and design engineering, operations, purchasing, accounting, finance, treasury, legal, tax, information technology, marketing, auditing, insurance and pension administration, human resources, systems and procedures, digital wireless communications, cellular tower space, and other services with respect to business and operations, construction management, and Southern
Regulatory Assets and Liabilities	Regulatory Assets and Liabilities The traditional electric operating companies and the natural gas distribution utilities are subject to accounting requirements for the effects of rate regulation. Regulatory assets represent probable future revenues associated with certain costs that are expected to be recovered from customers through the ratemaking process. Regulatory liabilities represent costs recovered that are expected to be incurred in the future or probable future reductions in revenues associated with amounts that are expected to be credited to customers through the ratemaking process. In the event that a portion of a traditional electric operating company's or a natural gas distribution utility's operations is no longer subject to applicable accounting rules for rate regulation, such company would be required to write off to income or reclassify to AOCI related regulatory assets and liabilities that are not specifically recoverable through regulated rates. In addition, the traditional electric operating company or the natural gas distribution utility would be required to determine if any impairment to other assets, including plant, exists and write down the assets, if impaired, to their fair values. All regulatory assets and liabilities are to be reflected in rates. See Note 2 for additional information including details of regulatory assets and liabilities reflected in the balance sheets for Southern Company, the traditional electric operating companies, and Southern Company Gas.
Revenues	Revenues The Registrants generate revenues from a variety of sources which are accounted for under various revenue accounting guidance, including revenue from contracts with customers, lease, derivative, and regulatory accounting. See Notes 4, 9, and 14 for additional information. Traditional Electric Operating Companies The majority of the revenues of the traditional electric operating companies are generated from contracts with retail electric customers. These revenues, generated from the integrated service to deliver electricity when and if called upon by the customer, are recognized as a single performance obligation satisfied over time, at a tariff rate, and as electricity is delivered to the customer during the month. Unbilled revenues related to retail sales are recognized for estimated deliveries of electricity not yet billed to these customers from the last bill date to the end of the accounting period. Retail rates may include provisions to adjust revenues for fluctuations in fuel costs, fuel hedging, the energy component of purchased power costs, and certain other costs. Revenues are adjusted for differences between these actual costs and amounts billed in current regulated rates. Under or over recovered regulatory clause revenues are recorded in the balance sheets and are recovered from or returned to customers, respectively, through adjustments to the billing factors. See Note 2 for additional information regarding regulatory matters of the traditional electric operating companies. Wholesale capacity revenues from PPAs are recognized in amounts billable under the contract terms. Energy and other revenues are generally recognized as services are provided. The contracts for capacity and energy in a wholesale PPA have multiple performance obligations where the contract's total transaction price is allocated to each performance obligation based on the standalone selling price. The standalone selling price is primarily determined by the price charged to customers for the specific goods or services transferred with the performance obligations. Generally, the traditional electric operating companies recognize revenue as the performance obligations are satisfied over time as electricity is delivered to the customer or as generation capacity is available to the customer. For both retail and wholesale revenues, the traditional electric operating companies have elected to recognize revenue for their sales of electricity and capacity using the invoice practical expedient as they generally have a right to consideration in an amount that corresponds directly with the value to the customer of the performance completed to date and that may be invoiced. Payment for goods and services rendered is typically due in the subsequent month following satisfaction of the Registrants' performance obligation. Southern Power Southern Power sells capacity and energy at rates specified under contractual terms in long-term PPAs. These PPAs are accounted for as leases, normal sale derivatives, or contracts with customers. Capacity revenues from PPAs classified as operating leases are recognized on a straight-line basis over the term of the agreement. Energy revenues are recognized in the period the energy is delivered. Capacity revenues from PPAs classified as sales-type leases are recognized by accounting for interest income on the net investment in the lease. Southern Power's non-lease contracts commonly include capacity and energy which are considered separate performance obligations. In these contracts, the total transaction price is allocated to each performance obligation based on the standalone selling price. The standalone selling price is primarily determined by the price charged to customers for the specific goods or services transferred with the performance obligations. Generally, Southern Power recognizes revenue as the performance obligations are satisfied over time, as electricity is delivered to the customer or as generation capacity is made available to the customer. Southern Power generally has a right to consideration in an amount that corresponds directly with the value to the customer of the performance completed to date and may recognize revenue in the amount to which the entity has a right to invoice. Payment for goods and services rendered is typically due in the subsequent month following satisfaction of Southern Power's performance obligation. When multiple contracts exist with the same counterparty, the revenues from each contract are accounted for as separate arrangements. Southern Power may also enter into contracts to sell short-term capacity in the wholesale electricity markets. These sales are generally classified as mark-to-market derivatives and net unrealized gains and losses on such contracts are recorded in wholesale revenues. See Note 14 and "Financial Instruments" herein for additional information. Southern Company Gas Southern Company Gas records revenues when goods or services are provided to customers. Those revenues are based on rates approved by the state regulatory agencies of the natural gas distribution utilities.The majority of the revenues of Southern Company Gas are generated from contracts with natural gas distribution customers. Revenues from this integrated service to deliver gas when and if called upon by the customer are recognized as a single performance obligation satisfied over time and are recognized at a tariff rate as gas is delivered to the customer during the month. Revenues from sales and transportation services are recognized in the same period in which the related volumes are delivered to customers. Revenues from residential and certain commercial and industrial customers are recognized on the basis of scheduled meter readings. Additionally, unbilled revenues are recognized for estimated deliveries of gas not yet billed to these customers, from the last bill date to the end of the accounting period. For other commercial and industrial customers, revenues are based on actual deliveries through the end of the period. Southern Company Gas has elected to recognize revenue for sales of gas using the invoice practical expedient as it generally has a right to consideration in an amount that corresponds directly with the value to the customer of the performance completed to date and that may be invoiced. Payment for goods and services rendered is typically due in the subsequent month following satisfaction of Southern Company Gas' performance obligation. Gas Distribution Operations Atlanta Gas Light operates in a deregulated natural gas market wher eby M arketers, rather than a traditional utility, sell natural gas to end-use customers in Georgia and handle customer billing functions. As required by the Georgia PSC, Atlanta Gas Light bills Marketers in equal monthly installments for each residential, commercial, and industrial end-use customer's distribution costs as well as for capacity costs utilizing a seasonal rate design for the calculation of each residential end-use customer's annual straight-fixed-variable charge, which reflects the historic volumetric usage pattern for the entire residential class. With the exception of Atlanta Gas Light, the natural gas distribution utilities have rate structures that include volumetric rate designs that allow the opportunity to recover certain costs based on gas usage. The tariffs for the natural gas distribution utilities include provisions which allow for the recognition of certain revenues prior to the time such revenues are billed to customers. These provisions are referred to as alternative revenue programs and provide for the recognition of certain revenues prior to billing, as long as the amounts recognized will be collected from customers within 24 months of recognition. Revenue related to alternative revenue programs was $43 million, $20 million, and $(5) million in 2024, 2023, and 2022, respectively. These programs primarily consist of: • Weather normalization adjustments – reduce customer bills when winter weather is colder than normal and increase customer bills when weather is warmer than normal and are included in the tariffs for Virginia Natural Gas and Chattanooga Gas; • Revenue normalization mechanisms – mitigate the impact of conservation and declining customer usage and are contained in the tariffs for Virginia Natural Gas and Nicor Gas; and • Revenue true-up adjustment – included within the provisions of the GRAM program in which Atlanta Gas Light participates as a short-term alternative to formal rate case filings, the revenue true-up feature provides for a positive (or negative) adjustment to record revenue in the amount of any variance to budgeted revenues, which are submitted and approved annually as a requirement of GRAM. Such adjustments are reflected in customer billings in a subsequent program year. Gas Marketing Services Gas marketing services is comprised of several choice-based natural gas marketers operating in various deregulated jurisdictions. While gas marketing services follows the same general approach to revenue recognition described for Southern Company Gas above, it recognizes revenues on certain 12-month utility-bill management contracts as the lesser of cumulative earned or cumulative billed amounts. Concentration of Revenue Southern Company, Alabama Power, Georgia Power, Mississippi Power (with the exception of its full requirements cost-based MRA electric tariffs described below), Southern Power, and Southern Company Gas each have a diversified base of customers and no single customer comprises 10% or more of each company's revenues. Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based MRA electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 13.9% of Mississippi Power's total operating revenues in 2024.
Fuel Costs	Fuel Costs Fuel costs for the traditional electric operating companies and Southern Power are expensed as the fuel is used. Fuel expense generally includes fuel transportation costs and the cost of purchased emissions allowances as they are used. For Alabama Power and Georgia Power, fuel expense also includes the amortization of the cost of nuclear fuel. For the traditional electric operating companies, fuel costs also include gains and/or losses from fuel-hedging programs as approved by their respective state PSCs.
Cost of Natural Gas	Cost of Natural Gas Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, Southern Company Gas charges its utility customers for natural gas consumed using natural gas cost recovery mechanisms set by the applicable state regulatory agencies. Under these mechanisms, all prudently-incurred natural gas costs are passed through to customers without markup, subject to regulatory review. Southern Company Gas defers or accrues the difference between the actual cost of natural gas and the amount of commodity revenue earned in a given period such that no operating income is recognized related to these costs. The deferred or accrued amount is either billed or refunded to customers prospectively through adjustments to the commodity rate. Deferred and accrued natural gas costs are included in the balance sheets as regulatory assets and regulatory liabilities, respectively. Southern Company Gas' gas marketing services' customers are charged for actual or estimated natural gas consumed. Within cost of natural gas, Southern Company Gas also includes costs of lost and unaccounted for gas and gains and losses associated with certain derivatives.
Income Taxes and Other Taxes	Income Taxes The Registrants use the liability method of accounting for deferred income taxes and provide deferred income taxes for all significant income tax temporary differences. In accordance with regulatory requirements, deferred federal ITCs for the traditional electric operating companies are amortized over the average life of the related property, with such amortization normally applied as a credit to reduce depreciation and amortization in the statements of income. Southern Power's and the natural gas distribution utilities' deferred federal ITCs, as well as certain state ITCs for Nicor Gas, are amortized to income tax expense over the life of the respective asset. Under current tax law, certain projects at Southern Power related to the construction of renewable facilities are eligible for federal ITCs. Southern Power estimates eligible costs which, as they relate to acquisitions, may not be finalized until the allocation of the purchase price to assets has been finalized. Southern Power applies the deferred method to ITCs, whereby the ITCs are recorded as a deferred credit and amortized to income tax expense over the life of the respective asset. Furthermore, the tax basis of the asset is reduced by 50% of the ITCs received, which, together with the deferred credit, results in a net deferred tax asset. Southern Power has elected to recognize the tax benefit of this basis difference as a reduction to income tax expense in the year in which the plant reaches commercial operation. State ITCs are recognized as an income tax benefit in the period in which the credits are generated. In addition, certain projects are eligible for federal and state PTCs, which are recognized as an income tax benefit based on KWH production. Federal ITCs and PTCs, as well as state ITCs and other state tax credits available to reduce income taxes payable, were not fully utilized in 2024 and will be carried forward and utilized in future years. In addition, Southern Company is expected to have various state net operating loss (NOL) carryforwards for certain of its subsidiaries, including Mississippi Power and Southern Power, which would result in income tax benefits in the future, if utilized. See Note 10 under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" and " – Net Operating Loss Carryforwards" for additional information. In April 2024, the IRS issued final regulations related to the transferability of certain tax credits under the IRA. Southern Company and certain subsidiaries have tax credits that are eligible to be transferred at a discount to the generated credit value. The discount will be recorded as a reduction in tax credits recognized in the financial statements. See Note 10 under "Current and Deferred Income Taxes" for additional information. Under current tax law, Georgia Power is eligible to generate advanced nuclear PTCs for Plant Vogtle Units 3 and 4, which are recognized as an income tax benefit based on KWH production and are eligible to be transferred. Pursuant to the Vogtle Joint Ownership Agreements (as defined in Note 2 under "Georgia Power – Nuclear Construction – Cost and Schedule"), Georgia Power is purchasing advanced nuclear PTCs for Plant Vogtle Units 3 and 4 from the other Vogtle Owners. The gain recognized on the purchase of the joint owner PTCs is recognized as an income tax benefit. The Registrants recognize tax positions that are "more likely than not" of being sustained upon examination by the appropriate taxing authorities. See Note 10 under "Unrecognized Tax Benefits" for additional information. Other Taxes Taxes imposed on and collected from customers on behalf of governmental agencies are presented net on the Registrants' statements of income and are excluded from the transaction price in determining the revenue related to contracts with a customer. Southern Company Gas is taxed on its gas revenues by various governmental authorities, but is allowed to recover these taxes from its customers. Revenue taxes imposed on the natural gas distribution utilities are recorded at the amount charged to customers, which may include a small administrative fee, as operating revenues, and the related taxes imposed on Southern Company Gas are recorded as operating expenses on the statements of income. Revenue taxes included in operating expenses were $112 million, $129 million, and $158 million in 2024, 2023, and 2022, respectively.
Allowance for Funds Used During Construction and Interest Capitalized	Allowance for Funds Used During Construction and Interest Capitalized The traditional electric operating companies and the natural gas distribution utilities record AFUDC, which represents the estimated debt and equity costs of capital funds that are necessary to finance the construction of new regulated facilities. While cash is not realized currently, AFUDC increases the revenue requirement and is recovered over the service life of the asset through a higher rate base and higher depreciation. The equity component of AFUDC is not taxable. Interest related to financing the construction of new facilities at Southern Power and new facilities not included in the traditional electric operating companies' and Southern Company Gas' regulated rates is capitalized in accordance with standard interest capitalization requirements.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Registrants evaluate long-lived assets for impairment when events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. The determination of whether an impairment has occurred is based on either a specific regulatory disallowance, a sales transaction price that is less than the asset group's carrying amount, or an estimate of undiscounted future cash flows attributable to the asset group, as compared with the carrying amount of the assets. If an impairment has occurred, the amount of the impairment loss recognized is determined by either the amount of regulatory disallowance or by the amount the carrying amount exceeds the estimated fair value of the assets. For assets identified as held for sale, the carrying amount is compared to the estimated fair value less the cost to sell in order to determine if an impairment loss is required. Until the assets are disposed of, their estimated fair value is re-evaluated when circumstances or events change.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill and other intangible assets not subject to amortization are evaluated for impairment on an annual basis and when events or changes in circumstances necessitate an evaluation for impairment. Other intangible assets subject to amortization are evaluated for impairment when events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Southern Power's intangible assets consist primarily of certain PPAs acquired, which are amortized over the term of the respective PPA. Southern Company Gas' goodwill and other intangible assets primarily relate to its 2016 acquisition by Southern Company. In addition to these items, Southern Company's goodwill and other intangible assets also relate to its 2016 acquisition of PowerSecure. For its 2024 annual goodwill impairment test, Southern Company Gas management performed the quantitative assessment, which resulted in the fair value of its reporting units with goodwill exceeding their carrying amounts. For its 2023 and 2022 annual goodwill impairment tests, Southern Company Gas management performed the qualitative assessment and determined that it was more likely than not that the fair value of its reporting units with goodwill exceeded their carrying amounts, and therefore no quantitative assessment was required.
Acquisition Accounting	Acquisition Accounting At the time of an acquisition, management will assess whether acquired assets and activities meet the definition of a business. Acquisitions that meet the definition of a business are accounted for under the acquisition method, and operating results from the date of acquisition are included in the acquiring entity's financial statements. Identifiable assets acquired, liabilities assumed, and any noncontrolling interests (including any intangible assets) are recognized and measured at fair value. Assets acquired that do not meet the definition of a business are accounted for as an asset acquisition. The purchase price of each asset acquisition is allocated based on the relative fair value of assets acquired. See Note 15 for additional information, including recent and proposed acquisitions. Determining the fair value of assets acquired and liabilities assumed requires management judgment and management may engage independent valuation experts to assist in this process. Fair values are determined by using market participant assumptions and typically include the timing and amounts of future cash flows, incurred construction costs, the nature of acquired contracts, discount rates, power market prices, and expected asset lives. For potential or successful acquisitions that meet the definition of a business, any due diligence or transaction costs incurred are expensed as incurred. If the acquisition is accounted for as an asset acquisition, direct and incremental transaction costs can be capitalized as a component of the cost of the assets acquired. Historically, any contingent consideration relates to fixed amounts due to the seller once an acquired construction project is placed in service. For contingent consideration with variable payments, management fair values the arrangement with any changes recorded in the statements of income. See Note 13 for additional fair value information.
Development Costs	Development Costs For Southern Power, development costs are capitalized once a project is probable of completion, primarily based on a review of its economics and operational feasibility, as well as the status of power off-take agreements and regulatory approvals, if applicable. Southern Power's capitalized development costs are included in CWIP on the balance sheets. All of Southern Power's development costs incurred prior to the determination that a project is probable of completion are expensed as incurred and included in other operations and maintenance expense in the statements of income. If it is determined that a project is no longer probable of completion, any of Southern Power's capitalized development costs are expensed and included in other operations and maintenance expense in the statements of income.
Long-Term Service Agreements	Long-Term Service Agreements The traditional electric operating companies and Southern Power have entered into LTSAs for the purpose of securing maintenance support for certain of their generating facilities. The LTSAs cover all planned inspections on the covered equipment, which generally includes the cost of all labor and materials. The LTSAs also obligate the counterparties to cover the costs of unplanned maintenance on the covered equipment subject to limits and scope specified in each contract. Payments made under the LTSAs for the performance of any planned inspections or unplanned capital maintenance are recorded in the statements of cash flows as investing activities. Receipts of major parts into materials and supplies inventory prior to planned inspections are treated as noncash transactions in the statements of cash flows. Any payments made prior to the work being performed are recorded as prepayments in other current assets and non-current assets on the balance sheets or reduce existing payables for LTSA-related work already completed. At the time work is performed, an appropriate amount is accrued for future payments or transferred from the prepayment and recorded as property, plant, and equipment or expensed.
Transmission Receivables/Prepayments	Transmission Receivables/Prepayments As a result of Southern Power's acquisition and construction of generating facilities, Southern Power has transmission receivables and/or prepayments representing the portion of interconnection network and transmission upgrades that will be reimbursed to Southern Power. Upon completion of the related project, transmission costs are generally reimbursed by the interconnection provider within a five-year period and the receivable/prepayments are reduced as payments or services are received.
Cash, Cash Equivalents, and Restricted Cash	Cash, Cash Equivalents, and Restricted Cash For purposes of the financial statements, temporary cash investments are considered cash equivalents. Temporary cash investments are securities with original maturities of 90 days or less.
Storm Damage and Reliability Reserves	Storm Damage and Reliability Reserves In accordance with their respective state PSC orders, the traditional electric operating companies accrue certain amounts annually related to storm damage recovery. Each traditional electric operating company maintains a reserve to cover or is allowed to defer and recover the cost of damages from major storms to its transmission and distribution facilities and, for Mississippi Power, the cost of uninsured damages to its generation facilities and other property. Alabama Power and Mississippi Power also have authority from the Alabama PSC and the Mississippi PSC, respectively, to accrue certain additional amounts as circumstances warrant. Alabama Power recorded an additional accrual of $21 million in 2024, which is included in the table below.
Materials and Supplies	Materials and Supplies Materials and supplies for the traditional electric operating companies generally includes the average cost of transmission, distribution, and generating plant materials. Materials and supplies for Southern Company Gas generally includes the average cost of propane gas inventory, liquefied natural gas inventory, fleet fuel, and other materials and supplies. Materials and supplies for Southern Power generally includes the average cost of generating plant materials. Materials are recorded to inventory when purchased and then expensed or capitalized to property, plant, and equipment, as appropriate, at weighted average cost when installed. In addition, certain major parts are recorded as inventory when acquired and then capitalized at cost when installed to property, plant, and equipment.
Fuel Inventory	Fuel Inventory Fuel inventory for the traditional electric operating companies includes the average cost of coal, natural gas, oil, transportation, and emissions allowances. Fuel inventory for Southern Power, which is included in other current assets, includes the average cost of oil, natural gas, and emissions allowances. Fuel is recorded to inventory when purchased and then expensed, at weighted average cost, as used. Emissions allowances granted by the EPA are included in inventory at zero cost. The traditional electric operating companies recover fuel expense through fuel cost recovery rates approved by each state PSC or, for wholesale rates, the FERC.
Natural Gas for Sale	Natural Gas for Sale With the exception of Nicor Gas, Southern Company Gas records natural gas inventories on a weighted average cost of gas basis. In Georgia's deregulated, competitive environment, Marketers sell natural gas to firm end-use customers at market-based prices. On a monthly basis, Atlanta Gas Light assigns to Marketers the majority of the pipeline storage services that it has under contract, along with a corresponding amount of inventory. Atlanta Gas Light retains and manages a portion of its pipeline storage assets and related natural gas inventories for system balancing and to serve system demand. Nicor Gas' natural gas inventory is carried at cost on a LIFO basis. Inventory decrements occurring during the year that are restored prior to year-end are charged to cost of natural gas at the estimated annual replacement cost. Inventory decrements that are not restored prior to year-end are charged to cost of natural gas at the actual LIFO cost of the inventory layers liquidated. The cost of natural gas, including inventory costs, is recovered from customers under a purchased gas recovery mechanism adjusted for differences between actual costs and amounts billed; therefore, LIFO liquidations have no impact on Southern Company's or Southern Company Gas' net income. At December 31, 2024, the Nicor Gas LIFO inventory balance w as $188 million. Based on the average cost of gas purchased in December 2024, the estimated replacement cost of Nicor Gas' inventory at December 31, 2024 was $326 million.
Provision for Uncollectible Accounts	Provision for Uncollectible Accounts The customers of the traditional electric operating companies and the natural gas distribution utilities are billed monthly. For the majority of receivables, a provision for uncollectible accounts is established based on historical collection experience and other factors. For the remaining receivables, if the company is aware of a specific customer's inability to pay, a provision for uncollectible accounts is recorded to reduce the receivable balance to the amount reasonably expected to be collected. If circumstances change, the estimate of the recoverability of accounts receivable could change as well. Circumstances that could affect this estimate include, but are not limited to, customer credit issues, customer deposits, and general economic conditions. Customers' accounts are written off once they are deemed to be uncollectible. For all periods presented, uncollectible accounts averaged less than 1% of revenues for each Registrant. Credit risk exposure at Nicor Gas is mitigated by a bad debt rider approved by the Illinois Commission. The bad debt rider provides for the recovery from (or refund to) customers of the difference between Nicor Gas' actual bad debt experience on an annual basis and the benchmark bad debt expense used to establish its base rates for the respective year.
Concentration of Credit Risk	Concentration of Credit Risk Concentration of credit risk occurs at Atlanta Gas Light for amounts billed for services and other costs to its customers, which consist of 14 Marketers in Georgia (including SouthStar). The credit risk exposure to the Marketers varies seasonally, with the lowest exposure in the non-peak summer months and the highest exposure in the peak winter months. Marketers are responsible for the retail sale of natural gas to end-use customers in Georgia. The functions of the retail sale of gas include the purchase and sale of natural gas, customer service, billings, and collections. The provisions of Atlanta Gas Light's tariff allow Atlanta Gas Light to obtain credit security support in an amount equal to a minimum of two times a Marketer's highest month's estimated bill from Atlanta Gas Light.
Financial Instruments	Financial Instruments The traditional electric operating companies and Southern Power use derivative financial instruments to limit exposure to fluctuations in interest rates, the prices of certain fuel purchases, electricity purchases and sales, and occasionally foreign currency exchange rates. Southern Company Gas uses derivative financial instruments to limit exposure to fluctuations in natural gas prices, weather, and interest rates. All derivative financial instruments are recognized as either assets or liabilities on the balance sheets (included in "Other" or shown separately as "Risk Management Activities") and are measured at fair value. See Note 13 for additional information regarding fair value. Substantially all of the traditional electric operating companies', Southern Power's, and Southern Company Gas' bulk energy purchases and sales contracts that meet the definition of a derivative are excluded from fair value accounting requirements because they qualify for the "normal" scope exception and are accounted for under the accrual method. Derivative contracts that qualify as cash flow hedges of anticipated transactions or are recoverable through the traditional electric operating companies' and the natural gas distribution utilities' fuel-hedging programs result in the deferral of related gains and losses in AOCI or regulatory assets and liabilities, respectively, until the hedged transactions occur. Other derivative contracts that qualify as fair value hedges are marked to market through current period income and are recorded on a net basis in the statements of income. Cash flows from derivatives are classified on the statements of cash flows in the same category as the hedged item. See Note 14 for additional information regarding derivatives. The Registrants offset fair value amounts recognized for multiple derivative instruments executed with the same counterparty under netting arrangements. The Registrants had no outstanding collateral repayment obligations or rights to reclaim collateral arising from derivative instruments recognized at December 31, 2024. The Registrants are exposed to potential losses related to financial instruments in the event of counterparties' nonperformance. The Registrants have established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate their exposure to counterparty credit risk. Southern Company Gas Southern Company Gas enters into weather derivative contracts as economic hedges of natural gas revenues in the event of warmer-than-normal weather in the Heating Season. Exchange-traded options are carried at fair value, with changes reflected in natural gas revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the intrinsic value for non-exchange-traded contracts are also reflected in natural gas revenues in the statements of income. Southern Company Gas enters into transactions to secure transportation capacity between delivery points in order to serve its customers and various markets. NYMEX futures and OTC contracts are used to capture the price differential or spread between the locations served by the capacity to substantially protect the natural gas revenues that will ultimately be realized when the physical flow of natural gas between delivery points occurs. These contracts generally meet the definition of derivatives and are carried at fair value on the balance sheets, with changes in fair value included in earnings in the period of change. These contracts are not designated as hedges for accounting purposes. The purchase, transportation, storage, and sale of natural gas are accounted for on a weighted average cost or accrual basis, as appropriate, rather than on the fair value basis utilized for the derivatives used to mitigate the natural gas price risk associated with the storage and transportation portfolio. Monthly demand charges are incurred for the contracted storage and transportation capacity and payments associated with asset management agreements, and these demand charges and payments are recognized on the statements of income in the period they are incurred. This difference in accounting methods can result in volatility in reported earnings, even though the economic margin is substantially unchanged from the dates the transactions were consummated. The Registrants are exposed to market risks, including commodity price risk, interest rate risk, weather risk, and occasionally foreign currency exchange rate risk. To manage the volatility attributable to these exposures, each company nets its exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to each company's policies in areas such as counterparty exposure and risk management practices. Each company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the balance sheets as either assets or liabilities and are presented on a net basis. See Note 13 for additional fair value information. In the statements of cash flows, any cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities. Any cash impacts of settled foreign currency derivatives are classified as operating or financing activities to correspond with the classification of the hedged interest or principal, respectively. See Note 1 under "Financial Instruments" for additional information. Energy-Related Derivatives The Subsidiary Registrants enter into energy-related derivatives to hedge exposures to electricity, natural gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the traditional electric operating companies and the natural gas distribution utilities have limited exposure to market volatility in energy-related commodity prices. Each of the traditional electric operating companies and certain of the natural gas distribution utilities of Southern Company Gas manage fuel-hedging programs, implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies, through the use of financial derivative contracts, which are expected to continue to mitigate price volatility. The traditional electric operating companies (with respect to wholesale generating capacity) and Southern Power have limited exposure to market volatility in energy-related commodity prices because their long-term sales contracts shift substantially all fuel cost responsibility to the purchaser. However, the traditional electric operating companies and Southern Power may be exposed to market volatility in energy-related commodity prices to the extent any uncontracted capacity is used to sell electricity. Southern Company Gas retains exposure to price changes that can, in a volatile energy market, be material and can adversely affect its results of operations. Southern Company Gas also enters into weather derivative contracts as economic hedges in the event of warmer-than-normal weather. Exchange-traded options are carried at fair value, with changes reflected in natural gas revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the intrinsic value for non-exchange-traded contracts are reflected in natural gas revenues. Energy-related derivative contracts are accounted for under one of three methods: • Regulatory Hedges – Energy-related derivative contracts designated as regulatory hedges relate primarily to the traditional electric operating companies' and the natural gas distribution utilities' fuel-hedging programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as the underlying fuel is used in operations and ultimately recovered through an approved cost recovery mechanism. • Cash Flow Hedges – Gains and losses on energy-related derivatives designated as cash flow hedges (which are mainly used to hedge anticipated purchases and sales) are initially deferred in AOCI before being recognized in the statements of income in the same period and in the same income statement line item as the earnings effect of the hedged transactions. • Not Designated – Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred. Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric and natural gas industries. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered. Interest Rate Derivatives Southern Company and certain subsidiaries may enter into interest rate derivatives to hedge exposure to changes in interest rates. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and presented on the same income statement line item as the earnings effect of the hedged transactions. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item. Fair value gains or losses on derivatives that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred. Foreign Currency Derivatives Southern Company and certain subsidiaries, including Southern Power, may enter into foreign currency derivatives to hedge exposure to changes in foreign currency exchange rates, such as that arising from the issuance of debt denominated in a currency other than U.S. dollars. Derivatives related to forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and on the same income statement line as the earnings effect of the hedged transactions, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Southern Company has elected to exclude the cross-currency basis spread from the assessment of effectiveness in the fair value hedges of its foreign currency risk and record any difference between the change in the fair value of the excluded components and the amounts recognized in earnings as a component of OCI.
Comprehensive Income	Comprehensive Income The objective of comprehensive income is to report a measure of all changes in common stock equity of an enterprise that result from transactions and other economic events of the period other than transactions with owners. Comprehensive income consists of net income attributable to the Registrant, changes in the fair value of qualifying cash flow hedges, and reclassifications for amounts included in net income. Comprehensive income also consists of certain changes in pension and other postretirement benefit plans for Southern Company, Southern Power, and Southern Company Gas.
Variable Interest Entities	Variable Interest Entities The Registrants may hold ownership interests in a number of business ventures with varying ownership structures. Partnership interests and other variable interests are evaluated to determine if each entity is a VIE. The primary beneficiary of a VIE is required to consolidate the VIE when it has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. See Note 7 for additional information regarding VIEs.
Asset Retirement Obligations	AROs are computed as the present value of the estimated costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The estimated costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities. Each traditional electric operating company and natural gas distribution utility has received accounting guidance from its state PSC or applicable state regulatory agency allowing the continued accrual or recovery of other retirement costs for long-lived assets that it does not have a legal obligation to retire. Accordingly, the accumulated removal costs for these obligations are reflected in the balance sheets as regulatory liabilities and amounts to be recovered are reflected in the balance sheets as regulatory assets. The ARO liabilities for the traditional electric operating companies primarily relate to facilities that are subject to the CCR Rule and the related state rules, principally surface impoundments. In addition, Alabama Power and Georgia Power have retirement obligations related to the decommissioning of nuclear facilities (Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle). See "Nuclear Decommissioning" herein for additional information. Other significant AROs include various landfill sites and asbestos removal for Alabama Power, Georgia Power, and Mississippi Power and gypsum cells and mine reclamation for Mississippi Power. The ARO liability for Southern Power primarily relates to its solar and wind facilities, which are located on long-term land leases requiring the restoration of land at the end of the lease. The traditional electric operating companies and Southern Company Gas also have identified other retirement obligations, such as obligations related to certain electric transmission and distribution facilities, certain asbestos-containing material within long-term assets not subject to ongoing repair and maintenance activities, certain wireless communication towers, the disposal of polychlorinated biphenyls in certain transformers, leasehold improvements, equipment on customer property, and property associated with the Southern Company system's rail lines and natural gas pipelines. However, liabilities for the removal of these assets have not been recorded because the settlement timing for certain retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these retirement obligations will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO. Southern Company and the traditional electric operating companies will continue to recognize in their respective statements of income allowed removal costs in accordance with regulatory treatment. Any differences between costs recognized in accordance with accounting standards related to asset retirement and environmental obligations and those reflected in rates are recognized as either a regulatory asset or liability in the balance sheets as ordered by the various state PSCs.
Nuclear Decommissioning	Nuclear Decommissioning The NRC requires licensees of commercial nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. Alabama Power and Georgia Power have external trust funds (Funds) to comply with the NRC's regulations. Use of the Funds is restricted to nuclear decommissioning activities. The Funds are managed and invested in accordance with applicable requirements of various regulatory bodies, including the NRC, the FERC, and state PSCs, as well as the IRS. While Alabama Power and Georgia Power are allowed to prescribe an overall investment policy to the Funds' managers, neither Southern Company nor its subsidiaries or affiliates are allowed to engage in the day-to-day management of the Funds or to mandate individual investment decisions. Day-to-day management of the investments in the Funds is delegated to unrelated third-party managers with oversight by the management of Alabama Power and Georgia Power. The Funds' managers are authorized, within certain investment guidelines, to actively buy and sell securities at their own discretion in order to maximize the return on the Funds' investments. The Funds are invested in a tax-efficient manner in a diversified mix of equity and fixed income securities and are reported as trading securities. Alabama Power and Georgia Power record the investment securities held in the Funds at fair value, as disclosed in Note 13, as management believes that fair value best represents the nature of the Funds. Gains and losses, whether realized or unrealized, are recorded in the regulatory liability for AROs in the balance sheets and are not included in net income or OCI. Fair value adjustments and realized gains and losses are determined on a specific identification basis.
Fair Value Measurement	Fair value measurements are based on inputs of observable and unobservable market data that a market participant would use in pricing the asset or liability. The use of observable inputs is maximized where available and the use of unobservable inputs is minimized for fair value measurement and reflects a three-tier fair value hierarchy that prioritizes inputs to valuation techniques used for fair value measurement. • Level 1 consists of observable market data in an active market for identical assets or liabilities. • Level 2 consists of observable market data, other than that included in Level 1, that is either directly or indirectly observable. • Level 3 consists of unobservable market data. The input may reflect the assumptions of each Registrant of what a market participant would use in pricing an asset or liability. If there is little available market data, then each Registrant's own assumptions are the best available information. In the case of multiple inputs being used in a fair value measurement, the lowest level input that is significant to the fair value measurement represents the level in the fair value hierarchy in which the fair value measurement is reported. Valuation Methodologies The energy-related derivatives primarily consist of exchange-traded and OTC financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard OTC products that are valued using observable market data and assumptions commonly used by market participants. The fair value of interest rate derivatives reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and, occasionally, implied volatility of interest rate options. The fair value of cross-currency swaps reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future foreign currency exchange rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and discount rates. The interest rate derivatives and cross-currency swaps are categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of similar instruments. See Note 14 for additional information on how these derivatives are used. For fair value measurements of the investments within the nuclear decommissioning trusts and the non-qualified deferred compensation trusts, external pricing vendors are designated for each asset class with each security specifically assigned a primary pricing source. For investments held within commingled funds, fair value is determined at the end of each business day through the net asset value, which is established by obtaining the underlying securities' individual prices from the primary pricing source. A market price secured from the primary source vendor is then evaluated by management in its valuation of the assets within the trusts. As a general approach, fixed income market pricing vendors gather market data (including indices and market research reports) and integrate relative credit information, observed market movements, and sector news into proprietary pricing models, pricing systems, and mathematical tools. Dealer quotes and other market information, including live trading levels and pricing analysts' judgments, are also obtained when available. The NRC requires licensees of commissioned nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. See Note 6 under "Nuclear Decommissioning" for additional information. Southern Power has contingent payment obligations related to two of its acquisitions whereby it is primarily obligated to make generation-based payments to the seller, commencing at the commercial operation of each facility and continuing through 2026 and 2036, respectively. The obligations are primarily categorized as Level 3 under Fair Value Measurements as the fair value is determined using significant unobservable inputs for the forecasted facility's generation in MW-hours, as well as other inputs such as a fixed dollar amount per MW-hour, and a discount rate. The fair value of the obligations reflects the net present value of expected payments and any periodic change arising from forecasted generation is expected to be immaterial. Southern Power also has payment obligations through 2040 whereby it must reimburse the transmission owners for interconnection facilities and network upgrades constructed to support connection of a Southern Power generating facility to the transmission system. The obligations are categorized as Level 2 under Fair Value Measurements as the fair value is determined using observable inputs for the contracted amounts and reimbursement period, as well as a discount rate. The fair value of the obligations reflects the net present value of expected payments. "Other investments" primarily includes investments traded in the open market that have maturities greater than 90 days, which are categorized as Level 2 under Fair Value Measurements and are comprised of corporate bonds, bank certificates of deposit, treasury bonds, and/or agency bonds.

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Schedule of costs for affiliate transactions	Costs for these services from SCS in 2024, 2023, and 2022 were as follows: Alabama Georgia Mississippi Southern 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 Southern (in millions) 2024 $ 8 $ 17 2023 4 13 2022 4 29 Alabama Georgia Southern Southern Company Gas (in millions) 2024 $ 13 $ 103 $ 35 $ 28 2023 12 101 34 28 2022 18 99 37 27 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 %
Schedule of total AFUDC and interest capitalized	Total AFUDC and interest capitalized for the applicable Registrants in 2024, 2023, and 2022 was as follows: Southern Company Alabama Georgia (*) Southern Southern Company Gas (in millions) 2024 $ 339 $ 76 $ 209 $ 7 $ 47 2023 400 109 251 3 37 2022 327 90 213 — 24 (*) 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 through each unit's respective in-service date.
Schedule of average AFUDC composite rates	The average AFUDC composite rates for 2024, 2023, and 2022 for the traditional electric operating companies and the natural gas distribution utilities were as follows: 2024 2023 2022 Alabama Power 8.1 % 8.1 % 7.9 % Georgia Power (a) 7.7 % 7.6 % 7.3 % Mississippi Power (b) — % — % 5.3 % Southern Company Gas: Atlanta Gas Light 7.7 % 7.4 % 7.6 % Chattanooga Gas 7.1 % 7.1 % 7.1 % Nicor Gas 5.6 % 4.6 % 2.0 % (a) Excludes AFUDC related to the construction of Plant Vogtle Units 3 and 4 in 2022 and 2023 and Plant Vogtle Unit 4 in 2024. See Note 2 under "Georgia Power – Nuclear Construction" for additional information. (b) Mississippi Power's AFUDC was immaterial in 2024 and 2023.
Schedule of goodwill balances	At December 31, 2024 and 2023, goodwill was as follows: At December 31, 2024 At December 31, 2023 (in millions) Southern Company $ 5,161 $ 5,161 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, 2024 and 2023, other intangible assets were as follows: At December 31, 2024 At December 31, 2023 Gross Carrying Amount Accumulated Amortization Other Gross Carrying Amount Accumulated Amortization Other (in millions) (in millions) Southern Company Subject to amortization: Customer relationships $ 212 $ (182) $ 30 $ 212 $ (172) $ 40 Trade names 64 (59) 5 64 (53) 11 PPA fair value adjustments 390 (168) 222 390 (148) 242 Other 3 (3) — 3 (3) — Total subject to amortization $ 669 $ (412) $ 257 $ 669 $ (376) $ 293 Not subject to amortization: FCC licenses 75 — 75 75 — 75 Total other intangible assets $ 744 $ (412) $ 332 $ 744 $ (376) $ 368 Southern Power (*) PPA fair value adjustments $ 390 $ (168) $ 222 $ 390 $ (148) $ 242 Southern Company Gas (*) Gas marketing services Customer relationships $ 156 $ (150) $ 6 $ 156 $ (145) $ 11 Trade names 26 (23) 3 26 (21) 5 Total other intangible assets $ 182 $ (173) $ 9 $ 182 $ (166) $ 16 (*) All subject to amortization.
Schedule of intangible assets not subject to amortization	At December 31, 2024 and 2023, other intangible assets were as follows: At December 31, 2024 At December 31, 2023 Gross Carrying Amount Accumulated Amortization Other Gross Carrying Amount Accumulated Amortization Other (in millions) (in millions) Southern Company Subject to amortization: Customer relationships $ 212 $ (182) $ 30 $ 212 $ (172) $ 40 Trade names 64 (59) 5 64 (53) 11 PPA fair value adjustments 390 (168) 222 390 (148) 242 Other 3 (3) — 3 (3) — Total subject to amortization $ 669 $ (412) $ 257 $ 669 $ (376) $ 293 Not subject to amortization: FCC licenses 75 — 75 75 — 75 Total other intangible assets $ 744 $ (412) $ 332 $ 744 $ (376) $ 368 Southern Power (*) PPA fair value adjustments $ 390 $ (168) $ 222 $ 390 $ (148) $ 242 Southern Company Gas (*) Gas marketing services Customer relationships $ 156 $ (150) $ 6 $ 156 $ (145) $ 11 Trade names 26 (23) 3 26 (21) 5 Total other intangible assets $ 182 $ (173) $ 9 $ 182 $ (166) $ 16 (*) All subject to amortization.
Schedule of amortization associated with other intangible assets	Amortization associated with other intangible assets in 2024, 2023, and 2022 was as follows: 2024 2023 2022 (in millions) Southern Company (a) $ 35 $ 38 $ 39 Southern Power (b) 20 20 20 Southern Company Gas Gas marketing services 7 10 11 (a) Includes $20 million annually 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, 2024, the estimated amortization associated with other intangible assets for the next five years is as follows: 2025 2026 2027 2028 2029 (in millions) Southern Company $ 32 $ 27 $ 23 $ 23 $ 23 Southern Power 20 20 20 20 19 Southern Company Gas Gas marketing services 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 Alabama Power Georgia Southern Southern (in millions) At December 31, 2024 Cash and cash equivalents $ 1,070 $ 585 $ 97 $ 159 $ 43 Restricted cash (a) : Other current assets 31 — 21 9 1 Total cash, cash equivalents, and restricted cash (b) $ 1,101 $ 585 $ 118 $ 168 $ 44 At December 31, 2023 Cash and cash equivalents $ 748 $ 324 $ 9 $ 124 $ 33 Restricted cash (a) : Other current assets 141 85 37 17 2 Other deferred charges and assets 31 — 29 3 — Total cash, cash equivalents, and restricted cash (b) $ 921 $ 409 $ 75 $ 144 $ 35 (a) For Alabama Power and Georgia Power, reflects proceeds from the issuance of solid waste disposal facility revenue bonds in 2023 and 2022, respectively. See Note 8 under "Long-term Debt" for additional information. For Southern Power, reflects $9 million and $17 million at December 31, 2024 and 2023, respectively, resulting from an arbitration award held to fund future replacement costs and $3 million at December 31, 2023 held to fund estimated construction completion costs at the Deuel Harvest wind facility. 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 Alabama Power Georgia Southern Southern (in millions) At December 31, 2024 Cash and cash equivalents $ 1,070 $ 585 $ 97 $ 159 $ 43 Restricted cash (a) : Other current assets 31 — 21 9 1 Total cash, cash equivalents, and restricted cash (b) $ 1,101 $ 585 $ 118 $ 168 $ 44 At December 31, 2023 Cash and cash equivalents $ 748 $ 324 $ 9 $ 124 $ 33 Restricted cash (a) : Other current assets 141 85 37 17 2 Other deferred charges and assets 31 — 29 3 — Total cash, cash equivalents, and restricted cash (b) $ 921 $ 409 $ 75 $ 144 $ 35 (a) For Alabama Power and Georgia Power, reflects proceeds from the issuance of solid waste disposal facility revenue bonds in 2023 and 2022, respectively. See Note 8 under "Long-term Debt" for additional information. For Southern Power, reflects $9 million and $17 million at December 31, 2024 and 2023, respectively, resulting from an arbitration award held to fund future replacement costs and $3 million at December 31, 2023 held to fund estimated construction completion costs at the Deuel Harvest wind facility. 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 regulatory assets	Storm damage reserve activity for the traditional electric operating companies during 2023 and 2024 was as follows: Southern Company Alabama Power Georgia Power Mississippi (in millions) Balance at December 31, 2022 $ 216 $ 97 $ 83 $ 36 Accrual 61 18 31 12 Weather-related damages (211) (39) (168) (4) Balance at December 31, 2023 $ 66 $ 76 $ (54) $ 44 Accrual 79 34 31 14 Weather-related damages (850) (40) (804) (6) Balance at December 31, 2024 $ (705) $ 70 $ (827) $ 52 The traditional electric operating companies accrued the following amounts related to storm damage recovery in 2022: Southern Company Alabama Georgia Mississippi Power (in millions) 2022 $ 239 $ 19 $ 213 $ 7 Southern Alabama Mississippi (in millions) 2024 $ 84 $ 63 $ 21 2023 63 52 11 2022 191 166 25 Details of regulatory assets and (liabilities) reflected in the balance sheets at December 31, 2024 and 2023 are provided in the following tables: Southern Company Alabama Power Georgia Power Mississippi Power Southern Company Gas (in millions) At December 31, 2024 AROs (*) $ 5,810 $ 1,906 $ 3,658 $ 248 $ — Retiree benefit plans (*) 2,605 680 892 134 44 Remaining net book value of retired assets 1,198 454 729 15 — Deferred income tax charges 927 264 634 27 — Storm damage 859 — 827 32 — Deferred depreciation 535 286 249 — — Environmental remediation (*) 249 — 16 — 233 Vacation pay (*) 224 85 112 12 15 Loss on reacquired debt 219 32 183 4 — Software and cloud computing costs 200 76 116 4 4 Under recovered regulatory clause revenues 167 119 — 17 31 Regulatory clauses 162 82 — — 80 Nuclear outage 92 39 53 — — Fuel-hedging (realized and unrealized) losses 69 23 29 17 — Qualifying repairs of natural gas distribution systems 53 — — — 53 Long-term debt fair value adjustment 52 — — — 52 Plant Daniel Units 3 and 4 23 — — 23 — Other regulatory assets 184 42 40 30 72 Deferred income tax credits (4,536) (1,398) (2,149) (219) (755) Other cost of removal obligations (1,176) 24 816 (170) (1,846) Over recovered regulatory clause revenues (285) (29) (52) — (204) Reliability reserves (188) (131) — (57) — Storm/property damage reserves (122) (70) — (52) — Nuclear fuel disposal cost recovery (100) (100) — — — Other regulatory liabilities (180) (28) (14) (6) (31) Total regulatory assets (liabilities), net $ 7,041 $ 2,356 $ 6,139 $ 59 $ (2,252) Southern Company Alabama Power Georgia Power Mississippi Power Southern Company Gas (in millions) At December 31, 2023 AROs ( * ) $ 5,733 $ 1,936 $ 3,505 $ 247 $ — Retiree benefit plans ( * ) 3,011 815 976 140 146 Remaining net book value of retired assets 1,357 499 841 17 — Deferred income tax charges 897 262 605 28 — Under recovered regulatory clause revenues 413 381 — 12 20 Fuel-hedging (realized and unrealized) losses 270 100 121 49 — Deferred depreciation 270 143 127 — — Environmental remediation ( * ) 255 — 20 — 235 Loss on reacquired debt 238 35 197 5 1 Vacation pay ( * ) 217 83 107 11 16 Software and cloud computing costs 150 59 84 2 5 Regulatory clauses 140 112 — — 28 Storm damage 92 — 54 38 — Nuclear outage 83 50 33 — — Long-term debt fair value adjustment 60 — — — 60 Qualifying repairs of natural gas distribution systems 40 — — — 40 Plant Daniel Units 3 and 4 25 — — 25 — Other regulatory assets 189 39 33 25 93 Deferred income tax credits (4,686) (1,506) (2,161) (241) (759) Other cost of removal obligations (1,312) 28 617 (186) (1,771) Over recovered regulatory clause revenues (287) (3) (46) — (238) Reliability reserves (179) (143) — (36) — Storm/property damage reserves (120) (76) — (44) — Other regulatory liabilities (333) (94) (23) (2) (101) Total regulatory assets (liabilities), net $ 6,523 $ 2,720 $ 5,090 $ 90 $ (2,225) (*) Generally not earning a return as they are excluded from rate base or are offset in rate base by a corresponding asset or liability. Unless otherwise noted, the following recovery and amortization periods for these regulatory assets and (liabilities) have been approved by the respective state PSC or regulatory agency: AROs and other cost of removal obligations – Generally recorded over the related property lives, which may range up to 64 years for Alabama Power, 54 years for Georgia Power, 67 years for Mississippi Power, and 85 years for Southern Company Gas. AROs and other cost of removal obligations are settled and trued up following completion of the related activities. Alabama Power is recovering CCR ARO expenditures over a 38-year period ending in 2054 through Rate CNP Compliance. Effective January 1, 2023, Georgia Power is recovering CCR ARO expenditures over four-year periods through its ECCR tariff. Prior to 2023, expenditures were recovered over three-year periods. See "Georgia Power – Rate Plans" herein and Note 6 for additional information. Retiree benefit plans – Recovered and amortized over the average remaining service period, which may range up to 14 years for Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas. Southern Company's balances also include amounts at SCS and Southern Nuclear that are allocated to the applicable regulated utilities. See Note 11 for additional information. Remaining net book value of retired assets – Alabama Power : Primarily represents the net book value of Plant Gorgas Unit 10 ($419 million at December 31, 2024) being amortized over 13 years (through 2037) and Plant Barry Unit 4 ($35 million at December 31, 2024) being amortized over 10 years (through 2034). See "Alabama Power – Environmental Accounting Order" herein for additional information. Georgia Power : Net book values of Plant Wansley Units 1 and 2 and Plant Hammond Units 3 and 4 (totaling $418 million and $302 million, respectively, at December 31, 2024) are being amortized over remaining periods between one Mississippi Power : Represents net book value of certain environmental compliance assets at Plant Watson and Plant Greene County. The retail portion is being amortized over 10 years (through 2033) and the wholesale portion is being amortized over 10 years (through 2034). See "Mississippi Power – Environmental Compliance Overview Plan" herein for additional information. Deferred income tax charges and credits – Charges are recovered and credits are primarily amortized over the related property lives, which may range up to 64 years for Alabama Power, 54 years for Georgia Power, 67 years for Mississippi Power, and 85 years for Southern Company Gas. See Note 10 for additional information. These accounts include certain deferred income tax assets and liabilities not subject to normalization, as described further below: Alabama Power : Related amounts at December 31, 2024 include excess federal deferred income tax liabilities that are available for the benefit of customers in 2025, as discussed under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" herein. Remaining amounts are being recovered and amortized ratably over the related property lives. Georgia Power : Related amounts at December 31, 2024 include $135 million of deferred income tax assets related to construction costs for Plant Vogtle Units 3 and 4 being recovered over 10 years (through 2034) and $102 million of excess state deferred income tax liabilities that will be returned to customers in 2025. See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4. Southern Company Gas : Related amounts at December 31, 2024 include $24 million of deferred income tax liabilities being amortized over periods generally not exceeding five years, primarily related to excess state deferred income tax liabilities. See "Southern Company Gas – Rate Proceedings" herein for additional information. Storm damage – See "Georgia Power – Storm Damage Recovery" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Mississippi Power's balance represents deferred storm costs associated with Hurricanes Ida and Zeta being recovered through PEP over seven years (through 2029). Deferred depreciation – Alabama Power : Represents deferred depreciation for Plant Barry Unit 5 ($114 million at December 31, 2024) and Plant Barry common coal assets ($48 million at December 31, 2024) to be amortized until 2036 beginning when Plant Barry Unit 5 is retired and Plant Gaston Unit 5 coal assets ($124 million at December 31, 2024) to be amortized until 2039 beginning when the assets are retired. Georgia Power : Represents deferred depreciation for Plant Scherer Units 1 through 3 ($139 million at December 31, 2024) to be amortized over six years beginning in 2029 and Plant Bowen Units 1 and 2 ($80 million at December 31, 2024) to be amortized over four years beginning in 2031, both as approved under Georgia Power's 2022 ARP, and Plant Vogtle Unit 3 and common facilities ($29 million at December 31, 2024) being amortized over 10 years (through 2034). See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4. Environmental remediation – Effective January 1, 2023, Georgia Power is recovering $5 million annually for environmental remediation under the 2022 ARP. Southern Company Gas' costs are recovered through environmental cost recovery mechanisms when the remediation work is performed. See Note 3 under "Environmental Remediation" for additional information. Vacation pay – Recorded as earned by employees and recovered as paid, generally within one year. Includes both vacation and banked holiday pay, if applicable. Loss on reacquired debt – Recovered over either the remaining life of the original issue or, if refinanced, over the remaining life of the new issue. At December 31, 2024, the remaining amortization periods do not exceed 23 years for Alabama Power, 28 years for Georgia Power, 17 years for Mississippi Power, and three years for Southern Company Gas. Software and cloud computing costs – Represents certain deferred operations and maintenance costs associated with software and cloud computing projects. For Alabama Power, costs are amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). For Georgia Power, costs incurred through 2022 are being amortized over five years (through 2027), and the recovery period for costs incurred after 2022 will be determined in its next base rate case. For Mississippi Power, the recovery period will be determined in Mississippi Power's annual PEP filing process following the completion of the projects and is expected to begin no earlier than 2026. For Southern Company Gas, costs are being amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). Under and over recovered regulatory clause revenues – Alabama Power : Balances are recorded monthly and expected to be recovered over periods of up to six years, with the majority expected to be recovered within one year. See "Alabama Power – Rate CNP PPA," " – Rate CNP Compliance," and " – Rate ECR" herein for additional information. Georgia Power : Balances are recorded monthly and expected to be recovered or returned within two years. See "Georgia Power – Rate Plans" herein for additional information. Mississippi Power : At December 31, 2024, $17 million is expected to be recovered through various rate recovery mechanisms over a period to be determined in future rate filings. See "Mississippi Power – Ad Valorem Tax Adjustment" herein for additional information. Southern Company Gas : Balances are recorded and recovered or amortized over periods generally not exceeding five years. In addition to natural gas cost recovery mechanisms, the natural gas distribution utilities have various other cost recovery mechanisms for the recovery of costs, including those related to infrastructure replacement programs. Regulatory clauses – Alabama Power : Effective January 1, 2023, balance is being amortized through Rate RSE over a five-year period ending in 2027. Southern Company Gas : Represents amounts related to Nicor Gas' volume balancing adjustment rider expected to be recovered over a period of less than two years. Nuclear outage – Costs are deferred to a regulatory asset when incurred and amortized over a subsequent period of 18 months for Alabama Power and up to 24 months for Georgia Power. See Note 5 for additional information. Fuel-hedging (realized and unrealized) losses and gains – Assets and liabilities are recorded over the life of the underlying hedged purchase contracts. Upon final settlement, actual costs incurred are recovered through the applicable traditional electric operating company's fuel cost recovery mechanism. Purchase contracts generally do not exceed three and a half years for Alabama Power, three years for Georgia Power, and four years for Mississippi Power. Immaterial amounts for fuel-hedging gains at December 31, 2024 and 2023 are included in other regulatory liabilities. Qualifying repairs of natural gas distribution systems – Represents deferred costs of certain repairs at Atlanta Gas Light being amortized over 20 years. Long-term debt fair value adjustment – Recovered over the remaining lives of the original debt issuances at acquisition, which range up to 14 years at December 31, 2024. Plant Daniel Units 3 and 4 – Represents the difference between Mississippi Power's revenue requirement for Plant Daniel Units 3 and 4 under purchase accounting and operating lease accounting. At December 31, 2024, consists of the $16 million retail portion being amortized through 2039 over the remaining life of the related property and the $8 million wholesale portion being amortized over 10 years (through 2034). Other regulatory assets – Comprised of numerous immaterial components with remaining amortization periods at December 31, 2024 generally not exceeding 19 years for Alabama Power, 10 years for Georgia Power, 10 years for Mississippi Power, and 15 years for Southern Company Gas. Reliability reserves and storm/property damage reserves – Utilized as related expenses are incurred. See "Alabama Power – Rate NDR" and " – Reliability Reserve Accounting Order," "Georgia Power – Storm Damage Recovery," and "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Nuclear fuel disposal cost recovery – Represents award resulting from litigation related to nuclear fuel disposal costs. See Note 3 under "Nuclear Fuel Disposal Costs" for additional information. Other regulatory liabilities – Comprised of numerous immaterial components with remaining amortization periods at December 31, 2024 generally not exceeding one year for Alabama Power, three years for Georgia Power, one year for Mississippi Power, and 20 years for Southern Company Gas. The following table illustrates Southern Company Gas' authorized ratemaking amounts that are not recognized on its balance sheets. These amounts are primarily comprised of an allowed equity rate of return on assets associated with certain regulatory infrastructure programs. These amounts will be recognized as revenues in Southern Company Gas' financial statements in the periods they are billable to customers, the majority of which will be recovered by 2025. December 31, 2024 December 31, 2023 (in millions) Atlanta Gas Light $ 11 $ 23 Virginia Natural Gas 10 10 Chattanooga Gas 7 7 Nicor Gas — 3 Total $ 28 $ 43
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 Pension and Other 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) Current period change 28 (38) (10) Balance at December 31, 2023 (121) (56) (177) Current period change 75 24 99 Balance at December 31, 2024 $ (46) $ (32) $ (78) Southern Power Balance at December 31, 2021 $ 1 $ (29) $ (27) Current period change (10) 20 10 Balance at December 31, 2022 (9) (9) (18) Current period change 8 (7) 1 Balance at December 31, 2023 (1) (16) (17) Current period change 8 7 15 Balance at December 31, 2024 $ 7 $ (9) $ (2) 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 Current period change 1 (16) (15) Balance at December 31, 2023 (24) 40 16 Current period change 21 11 32 Balance at December 31, 2024 $ (3) $ 51 $ 48 (*) May not add due to rounding.

REGULATORY MATTERS (Tables)

REGULATORY MATTERS (Tables)	12 Months Ended
	Dec. 31, 2024
Regulated Operations [Abstract]
Schedule of regulatory assets	Storm damage reserve activity for the traditional electric operating companies during 2023 and 2024 was as follows: Southern Company Alabama Power Georgia Power Mississippi (in millions) Balance at December 31, 2022 $ 216 $ 97 $ 83 $ 36 Accrual 61 18 31 12 Weather-related damages (211) (39) (168) (4) Balance at December 31, 2023 $ 66 $ 76 $ (54) $ 44 Accrual 79 34 31 14 Weather-related damages (850) (40) (804) (6) Balance at December 31, 2024 $ (705) $ 70 $ (827) $ 52 The traditional electric operating companies accrued the following amounts related to storm damage recovery in 2022: Southern Company Alabama Georgia Mississippi Power (in millions) 2022 $ 239 $ 19 $ 213 $ 7 Southern Alabama Mississippi (in millions) 2024 $ 84 $ 63 $ 21 2023 63 52 11 2022 191 166 25 Details of regulatory assets and (liabilities) reflected in the balance sheets at December 31, 2024 and 2023 are provided in the following tables: Southern Company Alabama Power Georgia Power Mississippi Power Southern Company Gas (in millions) At December 31, 2024 AROs (*) $ 5,810 $ 1,906 $ 3,658 $ 248 $ — Retiree benefit plans (*) 2,605 680 892 134 44 Remaining net book value of retired assets 1,198 454 729 15 — Deferred income tax charges 927 264 634 27 — Storm damage 859 — 827 32 — Deferred depreciation 535 286 249 — — Environmental remediation (*) 249 — 16 — 233 Vacation pay (*) 224 85 112 12 15 Loss on reacquired debt 219 32 183 4 — Software and cloud computing costs 200 76 116 4 4 Under recovered regulatory clause revenues 167 119 — 17 31 Regulatory clauses 162 82 — — 80 Nuclear outage 92 39 53 — — Fuel-hedging (realized and unrealized) losses 69 23 29 17 — Qualifying repairs of natural gas distribution systems 53 — — — 53 Long-term debt fair value adjustment 52 — — — 52 Plant Daniel Units 3 and 4 23 — — 23 — Other regulatory assets 184 42 40 30 72 Deferred income tax credits (4,536) (1,398) (2,149) (219) (755) Other cost of removal obligations (1,176) 24 816 (170) (1,846) Over recovered regulatory clause revenues (285) (29) (52) — (204) Reliability reserves (188) (131) — (57) — Storm/property damage reserves (122) (70) — (52) — Nuclear fuel disposal cost recovery (100) (100) — — — Other regulatory liabilities (180) (28) (14) (6) (31) Total regulatory assets (liabilities), net $ 7,041 $ 2,356 $ 6,139 $ 59 $ (2,252) Southern Company Alabama Power Georgia Power Mississippi Power Southern Company Gas (in millions) At December 31, 2023 AROs ( * ) $ 5,733 $ 1,936 $ 3,505 $ 247 $ — Retiree benefit plans ( * ) 3,011 815 976 140 146 Remaining net book value of retired assets 1,357 499 841 17 — Deferred income tax charges 897 262 605 28 — Under recovered regulatory clause revenues 413 381 — 12 20 Fuel-hedging (realized and unrealized) losses 270 100 121 49 — Deferred depreciation 270 143 127 — — Environmental remediation ( * ) 255 — 20 — 235 Loss on reacquired debt 238 35 197 5 1 Vacation pay ( * ) 217 83 107 11 16 Software and cloud computing costs 150 59 84 2 5 Regulatory clauses 140 112 — — 28 Storm damage 92 — 54 38 — Nuclear outage 83 50 33 — — Long-term debt fair value adjustment 60 — — — 60 Qualifying repairs of natural gas distribution systems 40 — — — 40 Plant Daniel Units 3 and 4 25 — — 25 — Other regulatory assets 189 39 33 25 93 Deferred income tax credits (4,686) (1,506) (2,161) (241) (759) Other cost of removal obligations (1,312) 28 617 (186) (1,771) Over recovered regulatory clause revenues (287) (3) (46) — (238) Reliability reserves (179) (143) — (36) — Storm/property damage reserves (120) (76) — (44) — Other regulatory liabilities (333) (94) (23) (2) (101) Total regulatory assets (liabilities), net $ 6,523 $ 2,720 $ 5,090 $ 90 $ (2,225) (*) Generally not earning a return as they are excluded from rate base or are offset in rate base by a corresponding asset or liability. Unless otherwise noted, the following recovery and amortization periods for these regulatory assets and (liabilities) have been approved by the respective state PSC or regulatory agency: AROs and other cost of removal obligations – Generally recorded over the related property lives, which may range up to 64 years for Alabama Power, 54 years for Georgia Power, 67 years for Mississippi Power, and 85 years for Southern Company Gas. AROs and other cost of removal obligations are settled and trued up following completion of the related activities. Alabama Power is recovering CCR ARO expenditures over a 38-year period ending in 2054 through Rate CNP Compliance. Effective January 1, 2023, Georgia Power is recovering CCR ARO expenditures over four-year periods through its ECCR tariff. Prior to 2023, expenditures were recovered over three-year periods. See "Georgia Power – Rate Plans" herein and Note 6 for additional information. Retiree benefit plans – Recovered and amortized over the average remaining service period, which may range up to 14 years for Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas. Southern Company's balances also include amounts at SCS and Southern Nuclear that are allocated to the applicable regulated utilities. See Note 11 for additional information. Remaining net book value of retired assets – Alabama Power : Primarily represents the net book value of Plant Gorgas Unit 10 ($419 million at December 31, 2024) being amortized over 13 years (through 2037) and Plant Barry Unit 4 ($35 million at December 31, 2024) being amortized over 10 years (through 2034). See "Alabama Power – Environmental Accounting Order" herein for additional information. Georgia Power : Net book values of Plant Wansley Units 1 and 2 and Plant Hammond Units 3 and 4 (totaling $418 million and $302 million, respectively, at December 31, 2024) are being amortized over remaining periods between one Mississippi Power : Represents net book value of certain environmental compliance assets at Plant Watson and Plant Greene County. The retail portion is being amortized over 10 years (through 2033) and the wholesale portion is being amortized over 10 years (through 2034). See "Mississippi Power – Environmental Compliance Overview Plan" herein for additional information. Deferred income tax charges and credits – Charges are recovered and credits are primarily amortized over the related property lives, which may range up to 64 years for Alabama Power, 54 years for Georgia Power, 67 years for Mississippi Power, and 85 years for Southern Company Gas. See Note 10 for additional information. These accounts include certain deferred income tax assets and liabilities not subject to normalization, as described further below: Alabama Power : Related amounts at December 31, 2024 include excess federal deferred income tax liabilities that are available for the benefit of customers in 2025, as discussed under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" herein. Remaining amounts are being recovered and amortized ratably over the related property lives. Georgia Power : Related amounts at December 31, 2024 include $135 million of deferred income tax assets related to construction costs for Plant Vogtle Units 3 and 4 being recovered over 10 years (through 2034) and $102 million of excess state deferred income tax liabilities that will be returned to customers in 2025. See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4. Southern Company Gas : Related amounts at December 31, 2024 include $24 million of deferred income tax liabilities being amortized over periods generally not exceeding five years, primarily related to excess state deferred income tax liabilities. See "Southern Company Gas – Rate Proceedings" herein for additional information. Storm damage – See "Georgia Power – Storm Damage Recovery" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Mississippi Power's balance represents deferred storm costs associated with Hurricanes Ida and Zeta being recovered through PEP over seven years (through 2029). Deferred depreciation – Alabama Power : Represents deferred depreciation for Plant Barry Unit 5 ($114 million at December 31, 2024) and Plant Barry common coal assets ($48 million at December 31, 2024) to be amortized until 2036 beginning when Plant Barry Unit 5 is retired and Plant Gaston Unit 5 coal assets ($124 million at December 31, 2024) to be amortized until 2039 beginning when the assets are retired. Georgia Power : Represents deferred depreciation for Plant Scherer Units 1 through 3 ($139 million at December 31, 2024) to be amortized over six years beginning in 2029 and Plant Bowen Units 1 and 2 ($80 million at December 31, 2024) to be amortized over four years beginning in 2031, both as approved under Georgia Power's 2022 ARP, and Plant Vogtle Unit 3 and common facilities ($29 million at December 31, 2024) being amortized over 10 years (through 2034). See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4. Environmental remediation – Effective January 1, 2023, Georgia Power is recovering $5 million annually for environmental remediation under the 2022 ARP. Southern Company Gas' costs are recovered through environmental cost recovery mechanisms when the remediation work is performed. See Note 3 under "Environmental Remediation" for additional information. Vacation pay – Recorded as earned by employees and recovered as paid, generally within one year. Includes both vacation and banked holiday pay, if applicable. Loss on reacquired debt – Recovered over either the remaining life of the original issue or, if refinanced, over the remaining life of the new issue. At December 31, 2024, the remaining amortization periods do not exceed 23 years for Alabama Power, 28 years for Georgia Power, 17 years for Mississippi Power, and three years for Southern Company Gas. Software and cloud computing costs – Represents certain deferred operations and maintenance costs associated with software and cloud computing projects. For Alabama Power, costs are amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). For Georgia Power, costs incurred through 2022 are being amortized over five years (through 2027), and the recovery period for costs incurred after 2022 will be determined in its next base rate case. For Mississippi Power, the recovery period will be determined in Mississippi Power's annual PEP filing process following the completion of the projects and is expected to begin no earlier than 2026. For Southern Company Gas, costs are being amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). Under and over recovered regulatory clause revenues – Alabama Power : Balances are recorded monthly and expected to be recovered over periods of up to six years, with the majority expected to be recovered within one year. See "Alabama Power – Rate CNP PPA," " – Rate CNP Compliance," and " – Rate ECR" herein for additional information. Georgia Power : Balances are recorded monthly and expected to be recovered or returned within two years. See "Georgia Power – Rate Plans" herein for additional information. Mississippi Power : At December 31, 2024, $17 million is expected to be recovered through various rate recovery mechanisms over a period to be determined in future rate filings. See "Mississippi Power – Ad Valorem Tax Adjustment" herein for additional information. Southern Company Gas : Balances are recorded and recovered or amortized over periods generally not exceeding five years. In addition to natural gas cost recovery mechanisms, the natural gas distribution utilities have various other cost recovery mechanisms for the recovery of costs, including those related to infrastructure replacement programs. Regulatory clauses – Alabama Power : Effective January 1, 2023, balance is being amortized through Rate RSE over a five-year period ending in 2027. Southern Company Gas : Represents amounts related to Nicor Gas' volume balancing adjustment rider expected to be recovered over a period of less than two years. Nuclear outage – Costs are deferred to a regulatory asset when incurred and amortized over a subsequent period of 18 months for Alabama Power and up to 24 months for Georgia Power. See Note 5 for additional information. Fuel-hedging (realized and unrealized) losses and gains – Assets and liabilities are recorded over the life of the underlying hedged purchase contracts. Upon final settlement, actual costs incurred are recovered through the applicable traditional electric operating company's fuel cost recovery mechanism. Purchase contracts generally do not exceed three and a half years for Alabama Power, three years for Georgia Power, and four years for Mississippi Power. Immaterial amounts for fuel-hedging gains at December 31, 2024 and 2023 are included in other regulatory liabilities. Qualifying repairs of natural gas distribution systems – Represents deferred costs of certain repairs at Atlanta Gas Light being amortized over 20 years. Long-term debt fair value adjustment – Recovered over the remaining lives of the original debt issuances at acquisition, which range up to 14 years at December 31, 2024. Plant Daniel Units 3 and 4 – Represents the difference between Mississippi Power's revenue requirement for Plant Daniel Units 3 and 4 under purchase accounting and operating lease accounting. At December 31, 2024, consists of the $16 million retail portion being amortized through 2039 over the remaining life of the related property and the $8 million wholesale portion being amortized over 10 years (through 2034). Other regulatory assets – Comprised of numerous immaterial components with remaining amortization periods at December 31, 2024 generally not exceeding 19 years for Alabama Power, 10 years for Georgia Power, 10 years for Mississippi Power, and 15 years for Southern Company Gas. Reliability reserves and storm/property damage reserves – Utilized as related expenses are incurred. See "Alabama Power – Rate NDR" and " – Reliability Reserve Accounting Order," "Georgia Power – Storm Damage Recovery," and "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Nuclear fuel disposal cost recovery – Represents award resulting from litigation related to nuclear fuel disposal costs. See Note 3 under "Nuclear Fuel Disposal Costs" for additional information. Other regulatory liabilities – Comprised of numerous immaterial components with remaining amortization periods at December 31, 2024 generally not exceeding one year for Alabama Power, three years for Georgia Power, one year for Mississippi Power, and 20 years for Southern Company Gas. The following table illustrates Southern Company Gas' authorized ratemaking amounts that are not recognized on its balance sheets. These amounts are primarily comprised of an allowed equity rate of return on assets associated with certain regulatory infrastructure programs. These amounts will be recognized as revenues in Southern Company Gas' financial statements in the periods they are billable to customers, the majority of which will be recovered by 2025. December 31, 2024 December 31, 2023 (in millions) Atlanta Gas Light $ 11 $ 23 Virginia Natural Gas 10 10 Chattanooga Gas 7 7 Nicor Gas — 3 Total $ 28 $ 43
Schedule of regulatory liabilities	Details of regulatory assets and (liabilities) reflected in the balance sheets at December 31, 2024 and 2023 are provided in the following tables: Southern Company Alabama Power Georgia Power Mississippi Power Southern Company Gas (in millions) At December 31, 2024 AROs (*) $ 5,810 $ 1,906 $ 3,658 $ 248 $ — Retiree benefit plans (*) 2,605 680 892 134 44 Remaining net book value of retired assets 1,198 454 729 15 — Deferred income tax charges 927 264 634 27 — Storm damage 859 — 827 32 — Deferred depreciation 535 286 249 — — Environmental remediation (*) 249 — 16 — 233 Vacation pay (*) 224 85 112 12 15 Loss on reacquired debt 219 32 183 4 — Software and cloud computing costs 200 76 116 4 4 Under recovered regulatory clause revenues 167 119 — 17 31 Regulatory clauses 162 82 — — 80 Nuclear outage 92 39 53 — — Fuel-hedging (realized and unrealized) losses 69 23 29 17 — Qualifying repairs of natural gas distribution systems 53 — — — 53 Long-term debt fair value adjustment 52 — — — 52 Plant Daniel Units 3 and 4 23 — — 23 — Other regulatory assets 184 42 40 30 72 Deferred income tax credits (4,536) (1,398) (2,149) (219) (755) Other cost of removal obligations (1,176) 24 816 (170) (1,846) Over recovered regulatory clause revenues (285) (29) (52) — (204) Reliability reserves (188) (131) — (57) — Storm/property damage reserves (122) (70) — (52) — Nuclear fuel disposal cost recovery (100) (100) — — — Other regulatory liabilities (180) (28) (14) (6) (31) Total regulatory assets (liabilities), net $ 7,041 $ 2,356 $ 6,139 $ 59 $ (2,252) Southern Company Alabama Power Georgia Power Mississippi Power Southern Company Gas (in millions) At December 31, 2023 AROs ( * ) $ 5,733 $ 1,936 $ 3,505 $ 247 $ — Retiree benefit plans ( * ) 3,011 815 976 140 146 Remaining net book value of retired assets 1,357 499 841 17 — Deferred income tax charges 897 262 605 28 — Under recovered regulatory clause revenues 413 381 — 12 20 Fuel-hedging (realized and unrealized) losses 270 100 121 49 — Deferred depreciation 270 143 127 — — Environmental remediation ( * ) 255 — 20 — 235 Loss on reacquired debt 238 35 197 5 1 Vacation pay ( * ) 217 83 107 11 16 Software and cloud computing costs 150 59 84 2 5 Regulatory clauses 140 112 — — 28 Storm damage 92 — 54 38 — Nuclear outage 83 50 33 — — Long-term debt fair value adjustment 60 — — — 60 Qualifying repairs of natural gas distribution systems 40 — — — 40 Plant Daniel Units 3 and 4 25 — — 25 — Other regulatory assets 189 39 33 25 93 Deferred income tax credits (4,686) (1,506) (2,161) (241) (759) Other cost of removal obligations (1,312) 28 617 (186) (1,771) Over recovered regulatory clause revenues (287) (3) (46) — (238) Reliability reserves (179) (143) — (36) — Storm/property damage reserves (120) (76) — (44) — Other regulatory liabilities (333) (94) (23) (2) (101) Total regulatory assets (liabilities), net $ 6,523 $ 2,720 $ 5,090 $ 90 $ (2,225) (*) Generally not earning a return as they are excluded from rate base or are offset in rate base by a corresponding asset or liability. Unless otherwise noted, the following recovery and amortization periods for these regulatory assets and (liabilities) have been approved by the respective state PSC or regulatory agency: AROs and other cost of removal obligations – Generally recorded over the related property lives, which may range up to 64 years for Alabama Power, 54 years for Georgia Power, 67 years for Mississippi Power, and 85 years for Southern Company Gas. AROs and other cost of removal obligations are settled and trued up following completion of the related activities. Alabama Power is recovering CCR ARO expenditures over a 38-year period ending in 2054 through Rate CNP Compliance. Effective January 1, 2023, Georgia Power is recovering CCR ARO expenditures over four-year periods through its ECCR tariff. Prior to 2023, expenditures were recovered over three-year periods. See "Georgia Power – Rate Plans" herein and Note 6 for additional information. Retiree benefit plans – Recovered and amortized over the average remaining service period, which may range up to 14 years for Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas. Southern Company's balances also include amounts at SCS and Southern Nuclear that are allocated to the applicable regulated utilities. See Note 11 for additional information. Remaining net book value of retired assets – Alabama Power : Primarily represents the net book value of Plant Gorgas Unit 10 ($419 million at December 31, 2024) being amortized over 13 years (through 2037) and Plant Barry Unit 4 ($35 million at December 31, 2024) being amortized over 10 years (through 2034). See "Alabama Power – Environmental Accounting Order" herein for additional information. Georgia Power : Net book values of Plant Wansley Units 1 and 2 and Plant Hammond Units 3 and 4 (totaling $418 million and $302 million, respectively, at December 31, 2024) are being amortized over remaining periods between one Mississippi Power : Represents net book value of certain environmental compliance assets at Plant Watson and Plant Greene County. The retail portion is being amortized over 10 years (through 2033) and the wholesale portion is being amortized over 10 years (through 2034). See "Mississippi Power – Environmental Compliance Overview Plan" herein for additional information. Deferred income tax charges and credits – Charges are recovered and credits are primarily amortized over the related property lives, which may range up to 64 years for Alabama Power, 54 years for Georgia Power, 67 years for Mississippi Power, and 85 years for Southern Company Gas. See Note 10 for additional information. These accounts include certain deferred income tax assets and liabilities not subject to normalization, as described further below: Alabama Power : Related amounts at December 31, 2024 include excess federal deferred income tax liabilities that are available for the benefit of customers in 2025, as discussed under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" herein. Remaining amounts are being recovered and amortized ratably over the related property lives. Georgia Power : Related amounts at December 31, 2024 include $135 million of deferred income tax assets related to construction costs for Plant Vogtle Units 3 and 4 being recovered over 10 years (through 2034) and $102 million of excess state deferred income tax liabilities that will be returned to customers in 2025. See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4. Southern Company Gas : Related amounts at December 31, 2024 include $24 million of deferred income tax liabilities being amortized over periods generally not exceeding five years, primarily related to excess state deferred income tax liabilities. See "Southern Company Gas – Rate Proceedings" herein for additional information. Storm damage – See "Georgia Power – Storm Damage Recovery" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Mississippi Power's balance represents deferred storm costs associated with Hurricanes Ida and Zeta being recovered through PEP over seven years (through 2029). Deferred depreciation – Alabama Power : Represents deferred depreciation for Plant Barry Unit 5 ($114 million at December 31, 2024) and Plant Barry common coal assets ($48 million at December 31, 2024) to be amortized until 2036 beginning when Plant Barry Unit 5 is retired and Plant Gaston Unit 5 coal assets ($124 million at December 31, 2024) to be amortized until 2039 beginning when the assets are retired. Georgia Power : Represents deferred depreciation for Plant Scherer Units 1 through 3 ($139 million at December 31, 2024) to be amortized over six years beginning in 2029 and Plant Bowen Units 1 and 2 ($80 million at December 31, 2024) to be amortized over four years beginning in 2031, both as approved under Georgia Power's 2022 ARP, and Plant Vogtle Unit 3 and common facilities ($29 million at December 31, 2024) being amortized over 10 years (through 2034). See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4. Environmental remediation – Effective January 1, 2023, Georgia Power is recovering $5 million annually for environmental remediation under the 2022 ARP. Southern Company Gas' costs are recovered through environmental cost recovery mechanisms when the remediation work is performed. See Note 3 under "Environmental Remediation" for additional information. Vacation pay – Recorded as earned by employees and recovered as paid, generally within one year. Includes both vacation and banked holiday pay, if applicable. Loss on reacquired debt – Recovered over either the remaining life of the original issue or, if refinanced, over the remaining life of the new issue. At December 31, 2024, the remaining amortization periods do not exceed 23 years for Alabama Power, 28 years for Georgia Power, 17 years for Mississippi Power, and three years for Southern Company Gas. Software and cloud computing costs – Represents certain deferred operations and maintenance costs associated with software and cloud computing projects. For Alabama Power, costs are amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). For Georgia Power, costs incurred through 2022 are being amortized over five years (through 2027), and the recovery period for costs incurred after 2022 will be determined in its next base rate case. For Mississippi Power, the recovery period will be determined in Mississippi Power's annual PEP filing process following the completion of the projects and is expected to begin no earlier than 2026. For Southern Company Gas, costs are being amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). Under and over recovered regulatory clause revenues – Alabama Power : Balances are recorded monthly and expected to be recovered over periods of up to six years, with the majority expected to be recovered within one year. See "Alabama Power – Rate CNP PPA," " – Rate CNP Compliance," and " – Rate ECR" herein for additional information. Georgia Power : Balances are recorded monthly and expected to be recovered or returned within two years. See "Georgia Power – Rate Plans" herein for additional information. Mississippi Power : At December 31, 2024, $17 million is expected to be recovered through various rate recovery mechanisms over a period to be determined in future rate filings. See "Mississippi Power – Ad Valorem Tax Adjustment" herein for additional information. Southern Company Gas : Balances are recorded and recovered or amortized over periods generally not exceeding five years. In addition to natural gas cost recovery mechanisms, the natural gas distribution utilities have various other cost recovery mechanisms for the recovery of costs, including those related to infrastructure replacement programs. Regulatory clauses – Alabama Power : Effective January 1, 2023, balance is being amortized through Rate RSE over a five-year period ending in 2027. Southern Company Gas : Represents amounts related to Nicor Gas' volume balancing adjustment rider expected to be recovered over a period of less than two years. Nuclear outage – Costs are deferred to a regulatory asset when incurred and amortized over a subsequent period of 18 months for Alabama Power and up to 24 months for Georgia Power. See Note 5 for additional information. Fuel-hedging (realized and unrealized) losses and gains – Assets and liabilities are recorded over the life of the underlying hedged purchase contracts. Upon final settlement, actual costs incurred are recovered through the applicable traditional electric operating company's fuel cost recovery mechanism. Purchase contracts generally do not exceed three and a half years for Alabama Power, three years for Georgia Power, and four years for Mississippi Power. Immaterial amounts for fuel-hedging gains at December 31, 2024 and 2023 are included in other regulatory liabilities. Qualifying repairs of natural gas distribution systems – Represents deferred costs of certain repairs at Atlanta Gas Light being amortized over 20 years. Long-term debt fair value adjustment – Recovered over the remaining lives of the original debt issuances at acquisition, which range up to 14 years at December 31, 2024. Plant Daniel Units 3 and 4 – Represents the difference between Mississippi Power's revenue requirement for Plant Daniel Units 3 and 4 under purchase accounting and operating lease accounting. At December 31, 2024, consists of the $16 million retail portion being amortized through 2039 over the remaining life of the related property and the $8 million wholesale portion being amortized over 10 years (through 2034). Other regulatory assets – Comprised of numerous immaterial components with remaining amortization periods at December 31, 2024 generally not exceeding 19 years for Alabama Power, 10 years for Georgia Power, 10 years for Mississippi Power, and 15 years for Southern Company Gas. Reliability reserves and storm/property damage reserves – Utilized as related expenses are incurred. See "Alabama Power – Rate NDR" and " – Reliability Reserve Accounting Order," "Georgia Power – Storm Damage Recovery," and "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Nuclear fuel disposal cost recovery – Represents award resulting from litigation related to nuclear fuel disposal costs. See Note 3 under "Nuclear Fuel Disposal Costs" for additional information. Other regulatory liabilities – Comprised of numerous immaterial components with remaining amortization periods at December 31, 2024 generally not exceeding one year for Alabama Power, three years for Georgia Power, one year for Mississippi Power, and 20 years for Southern Company Gas. At December 31, 2024 and 2023, the environmental remediation liability and the balance of under recovered environmental remediation costs were reflected in the balance sheets of Southern Company, Georgia Power, and Southern Company Gas as shown in the table below. Alabama Power and Mississippi Power did not have environmental remediation liabilities at December 31, 2024 or 2023. Southern Company Georgia Southern Company Gas (in millions) December 31, 2024: Environmental remediation liability: Other current liabilities $ 37 $ 13 $ 24 Accrued environmental remediation 198 — 198 Under recovered environmental remediation costs: Other regulatory assets, current $ 37 $ 5 $ 32 Other regulatory assets, deferred 212 11 201 December 31, 2023: Environmental remediation liability: Other current liabilities $ 44 $ 14 $ 30 Accrued environmental remediation 192 — 192 Under recovered environmental remediation costs: Other regulatory assets, current $ 45 $ 5 $ 40 Other regulatory assets, deferred 210 15 195
Public utilities general disclosures	Details of tariff adjustments are provided in the following table: Tariff 2023 2024 2025 (in millions) Traditional base (a) $ 194 $ 275 $ 194 ECCR (21) (99) 126 DSM 37 10 (22) MFF 6 5 9 Total (b) $ 216 $ 191 $ 306 (a) For 2025, net of $122 million related to the Georgia state tax rate reduction. (b) Totals may not add due to rounding. The following table provides regulatory information for Southern Company Gas' natural gas distribution utilities: Nicor Gas Atlanta Gas Light Virginia Natural Gas Chattanooga Gas Authorized ROE at December 31, 2024 9.51% 10.25% 9.70% 9.80% Weather normalization mechanisms (a) ü ü Decoupled, including straight-fixed-variable rates (b) ü ü ü Regulatory infrastructure program rate (c) ü ü ü Bad debt rider (d) ü ü ü Energy efficiency plan (e) ü ü Annual base rate adjustment mechanism (f) ü ü Year of last base rate case decision 2023 2019 2023 2018 (a) Designed to help stabilize operating results by allowing recovery of costs in the event of unseasonal weather, but are not direct offsets to the potential impacts on earnings of weather and customer consumption. (b) Allows for recovery of fixed residential customer service costs separately from assumed natural gas volumes used by customers and provides a benchmark level of revenue for recovery. (c) See "Infrastructure Replacement Programs and Capital Projects" herein for additional information. Chattanooga Gas' pipeline replacement program costs are recovered through its annual base rate review mechanism. (d) The recovery (refund) of bad debt expense over (under) an established benchmark expense. The gas portion of bad debt expense is recovered through purchased gas adjustment mechanisms. Nicor Gas also has a rider to recover the non-gas portion of bad debt expense. (e) Recovery of costs associated with plans to achieve specified energy savings goals. (f) Regulatory mechanism allowing annual adjustments to base rates up or down based on authorized ROE and/or ROE range. The following table and discussions provide updates on the infrastructure replacement programs and capital projects at the natural gas distribution utilities at December 31, 2024. These programs are risk-based and designed to update and replace cast iron, bare steel, and mid-vintage plastic materials or expand Southern Company Gas' distribution systems to improve reliability and meet operational flexibility and growth. Utility Program Recovery Capital Expenditures in 2024 Capital Expenditures Since Project Inception Pipe Scope of Program Duration Last (in millions) (miles) (miles) (years) Virginia Natural Gas SAVE Rider $ 75 $ 561 598 938 18 2029 Atlanta Gas Light System Reinforcement Rider Rider 99 279 29 N/A 6 2027 Chattanooga Gas Pipeline Replacement Program Rate Base 12 28 24 73 7 2027 Total $ 186 $ 868 651 1,011 The following table provides a summary of QIP capital investments during the nine-year program: Year Status of QIP Annual Review Proceeding Capital Investments Disallowed Month of Disallowance (in millions) 2015 – 2018 Complete $ 1,246 $ — 2019 Complete (a) 415 32 June 2023 2020 Filed March 2021 402 (b) 2021 Filed March 2022 392 (b) 2022 Filed March 2023 408 (b) 6 (c)(d) November 2023 2023 Filed March 2024 365 (b) 25 (c)(d) November 2023 $ 3,228 $ 63 (a) Petition for leave to appeal filed to the Illinois Supreme Court for $14 million. (b) Capital investments are subject to the required QIP annual review proceeding; years 2020 through 2023 are pending with the Illinois Commission. (c) Appealed to the Illinois Appellate Court. (d) Disallowed in Nicor Gas' 2023 general base rate case proceeding. See "Rate Proceedings – Nicor Gas" herein for additional information regarding the Illinois Commission's disallowance of certain capital investments.
Schedule of revised cost and schedule	Georgia Power's net capital costs incurred through December 31, 2024 in connection with Plant Vogtle Units 3 and 4, and its approximate proportionate share of additional capital costs to be incurred after December 31, 2024, including completion of site demobilization and remaining contractor obligations, is as follows: (in millions) Total project capital cost forecast (a)(b) $ 10,732 Net investment at December 31, 2024 (b) (10,663) Remaining estimate to complete $ 69 (a) Includes approximately $1.2 billion of costs that are not shared with the other Vogtle Owners. Excludes financing costs capitalized through AFUDC of approximately $440 million accrued through Unit 4's in-service date. (b) Net of $1.7 billion received from Toshiba under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds.

CONTINGENCIES, COMMITMENTS, A_2

CONTINGENCIES, COMMITMENTS, AND GUARANTEES (Tables)	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of regulatory liabilities	Details of regulatory assets and (liabilities) reflected in the balance sheets at December 31, 2024 and 2023 are provided in the following tables: Southern Company Alabama Power Georgia Power Mississippi Power Southern Company Gas (in millions) At December 31, 2024 AROs (*) $ 5,810 $ 1,906 $ 3,658 $ 248 $ — Retiree benefit plans (*) 2,605 680 892 134 44 Remaining net book value of retired assets 1,198 454 729 15 — Deferred income tax charges 927 264 634 27 — Storm damage 859 — 827 32 — Deferred depreciation 535 286 249 — — Environmental remediation (*) 249 — 16 — 233 Vacation pay (*) 224 85 112 12 15 Loss on reacquired debt 219 32 183 4 — Software and cloud computing costs 200 76 116 4 4 Under recovered regulatory clause revenues 167 119 — 17 31 Regulatory clauses 162 82 — — 80 Nuclear outage 92 39 53 — — Fuel-hedging (realized and unrealized) losses 69 23 29 17 — Qualifying repairs of natural gas distribution systems 53 — — — 53 Long-term debt fair value adjustment 52 — — — 52 Plant Daniel Units 3 and 4 23 — — 23 — Other regulatory assets 184 42 40 30 72 Deferred income tax credits (4,536) (1,398) (2,149) (219) (755) Other cost of removal obligations (1,176) 24 816 (170) (1,846) Over recovered regulatory clause revenues (285) (29) (52) — (204) Reliability reserves (188) (131) — (57) — Storm/property damage reserves (122) (70) — (52) — Nuclear fuel disposal cost recovery (100) (100) — — — Other regulatory liabilities (180) (28) (14) (6) (31) Total regulatory assets (liabilities), net $ 7,041 $ 2,356 $ 6,139 $ 59 $ (2,252) Southern Company Alabama Power Georgia Power Mississippi Power Southern Company Gas (in millions) At December 31, 2023 AROs ( * ) $ 5,733 $ 1,936 $ 3,505 $ 247 $ — Retiree benefit plans ( * ) 3,011 815 976 140 146 Remaining net book value of retired assets 1,357 499 841 17 — Deferred income tax charges 897 262 605 28 — Under recovered regulatory clause revenues 413 381 — 12 20 Fuel-hedging (realized and unrealized) losses 270 100 121 49 — Deferred depreciation 270 143 127 — — Environmental remediation ( * ) 255 — 20 — 235 Loss on reacquired debt 238 35 197 5 1 Vacation pay ( * ) 217 83 107 11 16 Software and cloud computing costs 150 59 84 2 5 Regulatory clauses 140 112 — — 28 Storm damage 92 — 54 38 — Nuclear outage 83 50 33 — — Long-term debt fair value adjustment 60 — — — 60 Qualifying repairs of natural gas distribution systems 40 — — — 40 Plant Daniel Units 3 and 4 25 — — 25 — Other regulatory assets 189 39 33 25 93 Deferred income tax credits (4,686) (1,506) (2,161) (241) (759) Other cost of removal obligations (1,312) 28 617 (186) (1,771) Over recovered regulatory clause revenues (287) (3) (46) — (238) Reliability reserves (179) (143) — (36) — Storm/property damage reserves (120) (76) — (44) — Other regulatory liabilities (333) (94) (23) (2) (101) Total regulatory assets (liabilities), net $ 6,523 $ 2,720 $ 5,090 $ 90 $ (2,225) (*) Generally not earning a return as they are excluded from rate base or are offset in rate base by a corresponding asset or liability. Unless otherwise noted, the following recovery and amortization periods for these regulatory assets and (liabilities) have been approved by the respective state PSC or regulatory agency: AROs and other cost of removal obligations – Generally recorded over the related property lives, which may range up to 64 years for Alabama Power, 54 years for Georgia Power, 67 years for Mississippi Power, and 85 years for Southern Company Gas. AROs and other cost of removal obligations are settled and trued up following completion of the related activities. Alabama Power is recovering CCR ARO expenditures over a 38-year period ending in 2054 through Rate CNP Compliance. Effective January 1, 2023, Georgia Power is recovering CCR ARO expenditures over four-year periods through its ECCR tariff. Prior to 2023, expenditures were recovered over three-year periods. See "Georgia Power – Rate Plans" herein and Note 6 for additional information. Retiree benefit plans – Recovered and amortized over the average remaining service period, which may range up to 14 years for Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas. Southern Company's balances also include amounts at SCS and Southern Nuclear that are allocated to the applicable regulated utilities. See Note 11 for additional information. Remaining net book value of retired assets – Alabama Power : Primarily represents the net book value of Plant Gorgas Unit 10 ($419 million at December 31, 2024) being amortized over 13 years (through 2037) and Plant Barry Unit 4 ($35 million at December 31, 2024) being amortized over 10 years (through 2034). See "Alabama Power – Environmental Accounting Order" herein for additional information. Georgia Power : Net book values of Plant Wansley Units 1 and 2 and Plant Hammond Units 3 and 4 (totaling $418 million and $302 million, respectively, at December 31, 2024) are being amortized over remaining periods between one Mississippi Power : Represents net book value of certain environmental compliance assets at Plant Watson and Plant Greene County. The retail portion is being amortized over 10 years (through 2033) and the wholesale portion is being amortized over 10 years (through 2034). See "Mississippi Power – Environmental Compliance Overview Plan" herein for additional information. Deferred income tax charges and credits – Charges are recovered and credits are primarily amortized over the related property lives, which may range up to 64 years for Alabama Power, 54 years for Georgia Power, 67 years for Mississippi Power, and 85 years for Southern Company Gas. See Note 10 for additional information. These accounts include certain deferred income tax assets and liabilities not subject to normalization, as described further below: Alabama Power : Related amounts at December 31, 2024 include excess federal deferred income tax liabilities that are available for the benefit of customers in 2025, as discussed under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" herein. Remaining amounts are being recovered and amortized ratably over the related property lives. Georgia Power : Related amounts at December 31, 2024 include $135 million of deferred income tax assets related to construction costs for Plant Vogtle Units 3 and 4 being recovered over 10 years (through 2034) and $102 million of excess state deferred income tax liabilities that will be returned to customers in 2025. See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4. Southern Company Gas : Related amounts at December 31, 2024 include $24 million of deferred income tax liabilities being amortized over periods generally not exceeding five years, primarily related to excess state deferred income tax liabilities. See "Southern Company Gas – Rate Proceedings" herein for additional information. Storm damage – See "Georgia Power – Storm Damage Recovery" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Mississippi Power's balance represents deferred storm costs associated with Hurricanes Ida and Zeta being recovered through PEP over seven years (through 2029). Deferred depreciation – Alabama Power : Represents deferred depreciation for Plant Barry Unit 5 ($114 million at December 31, 2024) and Plant Barry common coal assets ($48 million at December 31, 2024) to be amortized until 2036 beginning when Plant Barry Unit 5 is retired and Plant Gaston Unit 5 coal assets ($124 million at December 31, 2024) to be amortized until 2039 beginning when the assets are retired. Georgia Power : Represents deferred depreciation for Plant Scherer Units 1 through 3 ($139 million at December 31, 2024) to be amortized over six years beginning in 2029 and Plant Bowen Units 1 and 2 ($80 million at December 31, 2024) to be amortized over four years beginning in 2031, both as approved under Georgia Power's 2022 ARP, and Plant Vogtle Unit 3 and common facilities ($29 million at December 31, 2024) being amortized over 10 years (through 2034). See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4. Environmental remediation – Effective January 1, 2023, Georgia Power is recovering $5 million annually for environmental remediation under the 2022 ARP. Southern Company Gas' costs are recovered through environmental cost recovery mechanisms when the remediation work is performed. See Note 3 under "Environmental Remediation" for additional information. Vacation pay – Recorded as earned by employees and recovered as paid, generally within one year. Includes both vacation and banked holiday pay, if applicable. Loss on reacquired debt – Recovered over either the remaining life of the original issue or, if refinanced, over the remaining life of the new issue. At December 31, 2024, the remaining amortization periods do not exceed 23 years for Alabama Power, 28 years for Georgia Power, 17 years for Mississippi Power, and three years for Southern Company Gas. Software and cloud computing costs – Represents certain deferred operations and maintenance costs associated with software and cloud computing projects. For Alabama Power, costs are amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). For Georgia Power, costs incurred through 2022 are being amortized over five years (through 2027), and the recovery period for costs incurred after 2022 will be determined in its next base rate case. For Mississippi Power, the recovery period will be determined in Mississippi Power's annual PEP filing process following the completion of the projects and is expected to begin no earlier than 2026. For Southern Company Gas, costs are being amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). Under and over recovered regulatory clause revenues – Alabama Power : Balances are recorded monthly and expected to be recovered over periods of up to six years, with the majority expected to be recovered within one year. See "Alabama Power – Rate CNP PPA," " – Rate CNP Compliance," and " – Rate ECR" herein for additional information. Georgia Power : Balances are recorded monthly and expected to be recovered or returned within two years. See "Georgia Power – Rate Plans" herein for additional information. Mississippi Power : At December 31, 2024, $17 million is expected to be recovered through various rate recovery mechanisms over a period to be determined in future rate filings. See "Mississippi Power – Ad Valorem Tax Adjustment" herein for additional information. Southern Company Gas : Balances are recorded and recovered or amortized over periods generally not exceeding five years. In addition to natural gas cost recovery mechanisms, the natural gas distribution utilities have various other cost recovery mechanisms for the recovery of costs, including those related to infrastructure replacement programs. Regulatory clauses – Alabama Power : Effective January 1, 2023, balance is being amortized through Rate RSE over a five-year period ending in 2027. Southern Company Gas : Represents amounts related to Nicor Gas' volume balancing adjustment rider expected to be recovered over a period of less than two years. Nuclear outage – Costs are deferred to a regulatory asset when incurred and amortized over a subsequent period of 18 months for Alabama Power and up to 24 months for Georgia Power. See Note 5 for additional information. Fuel-hedging (realized and unrealized) losses and gains – Assets and liabilities are recorded over the life of the underlying hedged purchase contracts. Upon final settlement, actual costs incurred are recovered through the applicable traditional electric operating company's fuel cost recovery mechanism. Purchase contracts generally do not exceed three and a half years for Alabama Power, three years for Georgia Power, and four years for Mississippi Power. Immaterial amounts for fuel-hedging gains at December 31, 2024 and 2023 are included in other regulatory liabilities. Qualifying repairs of natural gas distribution systems – Represents deferred costs of certain repairs at Atlanta Gas Light being amortized over 20 years. Long-term debt fair value adjustment – Recovered over the remaining lives of the original debt issuances at acquisition, which range up to 14 years at December 31, 2024. Plant Daniel Units 3 and 4 – Represents the difference between Mississippi Power's revenue requirement for Plant Daniel Units 3 and 4 under purchase accounting and operating lease accounting. At December 31, 2024, consists of the $16 million retail portion being amortized through 2039 over the remaining life of the related property and the $8 million wholesale portion being amortized over 10 years (through 2034). Other regulatory assets – Comprised of numerous immaterial components with remaining amortization periods at December 31, 2024 generally not exceeding 19 years for Alabama Power, 10 years for Georgia Power, 10 years for Mississippi Power, and 15 years for Southern Company Gas. Reliability reserves and storm/property damage reserves – Utilized as related expenses are incurred. See "Alabama Power – Rate NDR" and " – Reliability Reserve Accounting Order," "Georgia Power – Storm Damage Recovery," and "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Nuclear fuel disposal cost recovery – Represents award resulting from litigation related to nuclear fuel disposal costs. See Note 3 under "Nuclear Fuel Disposal Costs" for additional information. Other regulatory liabilities – Comprised of numerous immaterial components with remaining amortization periods at December 31, 2024 generally not exceeding one year for Alabama Power, three years for Georgia Power, one year for Mississippi Power, and 20 years for Southern Company Gas. At December 31, 2024 and 2023, the environmental remediation liability and the balance of under recovered environmental remediation costs were reflected in the balance sheets of Southern Company, Georgia Power, and Southern Company Gas as shown in the table below. Alabama Power and Mississippi Power did not have environmental remediation liabilities at December 31, 2024 or 2023. Southern Company Georgia Southern Company Gas (in millions) December 31, 2024: Environmental remediation liability: Other current liabilities $ 37 $ 13 $ 24 Accrued environmental remediation 198 — 198 Under recovered environmental remediation costs: Other regulatory assets, current $ 37 $ 5 $ 32 Other regulatory assets, deferred 212 11 201 December 31, 2023: Environmental remediation liability: Other current liabilities $ 44 $ 14 $ 30 Accrued environmental remediation 192 — 192 Under recovered environmental remediation costs: Other regulatory assets, current $ 45 $ 5 $ 40 Other regulatory assets, deferred 210 15 195

REVENUE FROM CONTRACTS WITH C_2

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Disaggregation of revenue	The following table disaggregates revenue from contracts with customers for the periods presented: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) 2024 Operating revenues Retail electric revenues Residential $ 8,276 $ 3,133 $ 4,835 $ 308 $ — $ — Commercial 6,585 2,042 4,219 324 — — Industrial 3,892 1,742 1,808 342 — — Other 124 13 102 9 — — Total retail electric revenues 18,877 6,930 10,964 983 — — Natural gas distribution revenues Residential 1,753 — — — — 1,753 Commercial 417 — — — — 417 Transportation 1,295 — — — — 1,295 Industrial 34 — — — — 34 Other 316 — — — — 316 Total natural gas distribution revenues 3,815 — — — — 3,815 Wholesale electric revenues PPA energy revenues 1,059 206 94 4 778 — PPA capacity revenues 641 108 136 63 400 — Non-PPA revenues 226 139 5 375 230 — Total wholesale electric revenues 1,926 453 235 442 1,408 — Other natural gas revenues Gas marketing services 507 — — — — 507 Other 18 — — — — 18 Total other natural gas revenues 525 — — — — 525 Other revenues 1,621 240 721 52 37 — Total revenue from contracts with customers 26,764 7,623 11,920 1,477 1,445 4,340 Other revenue sources (*) (40) (69) (589) (14) 569 116 Total operating revenues $ 26,724 $ 7,554 $ 11,331 $ 1,463 $ 2,014 $ 4,456 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) 2023 Operating revenues Retail electric revenues Residential $ 7,309 $ 2,904 $ 4,105 $ 300 $ — $ — Commercial 5,860 1,928 3,624 308 — — Industrial 3,613 1,721 1,558 334 — — Other 112 12 91 9 — — Total retail electric revenues 16,894 6,565 9,378 951 — — Natural gas distribution revenues Residential 1,981 — — — — 1,981 Commercial 505 — — — — 505 Transportation 1,184 — — — — 1,184 Industrial 45 — — — — 45 Other 324 — — — — 324 Total natural gas distribution revenues 4,039 — — — — 4,039 Wholesale electric revenues PPA energy revenues 1,107 234 87 20 790 — PPA capacity revenues 624 156 51 45 376 — Non-PPA revenues 250 65 35 407 409 — Total wholesale electric revenues 1,981 455 173 472 1,575 — Other natural gas revenues Gas marketing services 528 — — — — 528 Other 31 — — — — 31 Total other natural gas revenues 559 — — — — 559 Other revenues 1,355 213 578 39 55 — Total revenue from contracts with customers 24,828 7,233 10,129 1,462 1,630 4,598 Other revenue sources (*) 425 (183) (11) 12 559 104 Total operating revenues $ 25,253 $ 7,050 $ 10,118 $ 1,474 $ 2,189 $ 4,702 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) 2022 Operating revenues Retail electric revenues Residential $ 6,604 $ 2,638 $ 3,664 $ 302 $ — $ — Commercial 5,369 1,685 3,385 299 — — Industrial 3,764 1,507 1,921 336 — — Other 102 14 79 9 — — Total retail electric revenues 15,839 5,844 9,049 946 — — Natural gas distribution revenues Residential 2,843 — — — — 2,843 Commercial 763 — — — — 763 Transportation 1,186 — — — — 1,186 Industrial 84 — — — — 84 Other 342 — — — — 342 Total natural gas distribution revenues 5,218 — — — — 5,218 Wholesale electric revenues PPA energy revenues 2,274 489 130 16 1,673 — PPA capacity revenues 596 194 47 4 356 — Non-PPA revenues 250 200 30 690 740 — Total wholesale electric revenues 3,120 883 207 710 2,769 — Other natural gas revenues Gas marketing services 636 — — — — 636 Other 51 — — — — 51 Total other natural gas revenues 687 — — — — 687 Other revenues 1,077 194 446 47 36 — Total revenue from contracts with customers 25,941 6,921 9,702 1,703 2,805 5,905 Other revenue sources (*) 3,338 896 1,882 (9) 564 57 Total operating revenues $ 29,279 $ 7,817 $ 11,584 $ 1,694 $ 3,369 $ 5,962 (*) Other revenue sources relate to revenues from customers accounted for as derivatives and leases, alternative revenue programs at Southern Company Gas, and cost recovery mechanisms and revenues (including those related to fuel costs ) that meet other scope exceptions for revenues from contracts with customers at the traditional electric operating companies. Products and Services Electric Utilities' Revenues Year Retail Wholesale Other Total (in millions) 2024 $ 17,790 $ 2,431 $ 1,382 $ 21,603 2023 16,343 2,467 1,188 19,998 2022 18,197 3,641 1,035 22,873 Southern Company Gas' Revenues Year Gas Gas All Other Total (in millions) 2024 $ 3,899 $ 516 $ 41 $ 4,456 2023 4,090 548 64 4,702 2022 5,240 638 84 5,962
Contract with customer, asset and liability	The following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers at December 31, 2024 and 2023: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Accounts Receivable At December 31, 2024 $ 3,048 $ 783 $ 1,244 $ 113 $ 106 $ 660 At December 31, 2023 2,820 821 1,011 90 122 684 Contract Assets At December 31, 2024 $ 323 $ 3 $ 184 $ — $ — $ 72 At December 31, 2023 271 2 121 — — 56 Contract Liabilities At December 31, 2024 $ 140 $ 11 $ 34 $ — $ 2 $ 3 At December 31, 2023 116 — 1 — 4 —
Revenue, remaining performance obligation, expected timing of satisfaction	Revenues from contracts with customers related to these performance obligations remaining at December 31, 2024 are expected to be recognized as follows: 2025 2026 2027 2028 2029 Thereafter (in millions) Southern Company $ 937 $ 427 $ 371 $ 343 $ 309 $ 2,636 Alabama Power 11 — — — — — Georgia Power 69 30 15 16 2 27 Mississippi Power (*) 63 66 69 73 — — Southern Power (*) 340 331 340 316 312 2,609 Southern Company Gas 2 — — — — — (*) Includes performance obligations related to affiliate PPAs with Georgia Power. See Note 1 under "Affiliate Transactions" for additional information.

PROPERTY, PLANT, AND EQUIPMENT

PROPERTY, PLANT, AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Property, plant and equipment	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 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 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 Georgia Mississippi Southern 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 Southern (in millions) 2024 $ 8 $ 17 2023 4 13 2022 4 29 Alabama Georgia Southern Southern Company Gas (in millions) 2024 $ 13 $ 103 $ 35 $ 28 2023 12 101 34 28 2022 18 99 37 27 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 Plant in Service Accumulated 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.

ASSET RETIREMENT OBLIGATIONS (T

ASSET RETIREMENT OBLIGATIONS (Tables)	12 Months Ended
	Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]
Details of AROs included in the balance sheets	Details of the AROs included in the balance sheets are as follows: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power (*) (in millions) Balance at December 31, 2022 $ 10,840 $ 4,287 $ 6,034 $ 179 $ 144 Liabilities incurred 90 — 90 — — Liabilities settled (617) (270) (304) (18) — Accretion expense 403 156 230 5 6 Cash flow revisions (399) (15) (385) 2 — Balance at December 31, 2023 $ 10,317 $ 4,158 $ 5,665 $ 168 $ 150 Liabilities incurred 130 8 120 — 2 Liabilities settled (566) (254) (270) (17) — Accretion expense 400 153 232 5 7 Cash flow revisions (347) (7) (332) (8) — Balance at December 31, 2024 $ 9,934 $ 4,058 $ 5,415 $ 148 $ 159 (*) Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets.
Investment securities in the Funds	Investment securities in the Funds at December 31, 2024 and 2023 were as follows: Southern Company Alabama Georgia (in millions) At December 31, 2024: Equity securities $ 1,413 $ 848 $ 565 Debt securities 976 335 641 Other securities 232 202 30 Total investment securities in the Funds $ 2,621 $ 1,385 $ 1,236 At December 31, 2023: Equity securities $ 1,288 $ 796 $ 492 Debt securities 895 277 618 Other securities 239 186 53 Total investment securities in the Funds $ 2,422 $ 1,259 $ 1,163
Fair value increases (decreases) of the Funds	The fair value increases (decreases) of the Funds, including unrealized gains (losses) and reinvested interest and dividends and excluding the Funds' expenses, for 2024, 2023, and 2022 are shown in the table below. Southern Company Alabama Georgia (in millions) Fair value increases (decreases) 2024 $ 229 $ 143 $ 86 2023 281 157 124 2022 (360) (171) (189) Unrealized gains (losses) At December 31, 2024 $ 113 $ 64 $ 49 At December 31, 2023 241 119 122 At December 31, 2022 (391) (204) (187) At December 31, 2024, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows: Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2024: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Southern Company Assets: Energy-related derivatives (a) $ 12 $ 77 $ — $ — $ 89 Investments in trusts: (b) Domestic equity 849 250 — — 1,099 Foreign equity 148 175 — — 323 U.S. Treasury and government agency securities — 371 — — 371 Municipal bonds — 47 — — 47 Pooled funds – fixed income — 7 — — 7 Corporate bonds — 452 — — 452 Mortgage and asset backed securities — 106 — — 106 Private equity — — — 181 181 Cash and cash equivalents 1 — — — 1 Other 39 3 — 9 51 Investments, available for sale: U.S. Treasury and government agency securities 2 7 — — 9 Corporate bonds 1 2 — — 3 Mortgage and asset backed securities — 10 — — 10 Cash equivalents and restricted cash 533 19 — — 552 Other investments 9 31 8 — 48 Total $ 1,594 $ 1,557 $ 8 $ 190 $ 3,349 Liabilities: Energy-related derivatives (a) $ 5 $ 124 $ — $ — $ 129 Interest rate derivatives — 269 — — 269 Foreign currency derivatives — 218 — — 218 Contingent consideration 3 — 16 — 19 Other — 13 11 — 24 Total $ 8 $ 624 $ 27 $ — $ 659 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2024: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Alabama Power Assets: Energy-related derivatives $ — $ 26 $ — $ — $ 26 Nuclear decommissioning trusts: (b) Domestic equity 459 241 — — 700 Foreign equity 148 — — — 148 U.S. Treasury and government agency securities — 16 — — 16 Municipal bonds — 1 — — 1 Corporate bonds — 287 — — 287 Mortgage and asset backed securities — 31 — — 31 Private equity — — — 181 181 Other 11 1 — 9 21 Cash equivalents and restricted cash 334 19 — — 353 Other investments — 31 — — 31 Total $ 952 $ 653 $ — $ 190 $ 1,795 Liabilities: Energy-related derivatives $ — $ 42 $ — $ — $ 42 Georgia Power Assets: Energy-related derivatives $ — $ 19 $ — $ — $ 19 Nuclear decommissioning trusts: (b) Domestic equity 390 1 — — 391 Foreign equity — 174 — — 174 U.S. Treasury and government agency securities — 355 — — 355 Municipal bonds — 46 — — 46 Corporate bonds — 165 — — 165 Mortgage and asset backed securities — 75 — — 75 Other 28 2 — — 30 Cash equivalents 35 — — — 35 Total $ 453 $ 837 $ — $ — $ 1,290 Liabilities: Energy-related derivatives $ — $ 42 $ — $ — $ 42 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2024: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Mississippi Power Assets: Energy-related derivatives $ — $ 19 $ — $ — $ 19 Liabilities: Energy-related derivatives $ — $ 34 $ — $ — $ 34 Southern Power Assets: Energy-related derivatives $ — $ 4 $ — $ — $ 4 Cash equivalents 51 — — — 51 Total $ 51 $ 4 $ — $ — $ 55 Liabilities: Foreign currency derivatives $ — $ 51 $ — $ — $ 51 Contingent consideration 3 — 16 — 19 Other — 13 11 — 24 Total $ 3 $ 64 $ 27 $ — $ 94 Southern Company Gas Assets: Energy-related derivatives (a) $ 12 $ 9 $ — $ — $ 21 Non-qualified deferred compensation trusts: Domestic equity — 8 — — 8 Foreign equity — 1 — — 1 Pooled funds - fixed income — 7 — — 7 Cash and cash equivalents 1 — — — 1 Investments, available for sale: U.S. Treasury and government agency securities 2 7 — — 9 Corporate bonds 1 2 — — 3 Mortgage and asset backed securities — 10 — — 10 Cash equivalents 22 — — — 22 Total $ 38 $ 44 $ — $ — $ 82 Liabilities: Energy-related derivatives (a) $ 5 $ 6 $ — $ — $ 11 Interest rate derivatives — 84 — — 84 Total $ 5 $ 90 $ — $ — $ 95 (a) Excludes cash collateral of $17 million. (b) Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 under "Nuclear Decommissioning" for additional information. At December 31, 2023, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows: Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2023: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Southern Company Assets: Energy-related derivatives (a) $ 6 $ 49 $ — $ — $ 55 Investments in trusts: (b) Domestic equity 764 216 — — 980 Foreign equity 145 171 — — 316 U.S. Treasury and government agency securities — 369 — — 369 Municipal bonds — 48 — — 48 Pooled funds – fixed income — 6 — — 6 Corporate bonds — 389 — — 389 Mortgage and asset backed securities — 89 — — 89 Private equity — — — 169 169 Cash and cash equivalents 3 — — — 3 Other 58 3 — 9 70 Cash equivalents and restricted cash 253 15 — — 268 Other investments 9 27 8 — 44 Total $ 1,238 $ 1,382 $ 8 $ 178 $ 2,806 Liabilities: Energy-related derivatives (a) $ 46 $ 312 $ — $ — $ 358 Interest rate derivatives — 264 — — 264 Foreign currency derivatives — 122 — — 122 Contingent consideration 3 — 16 — 19 Other — 13 — — 13 Total $ 49 $ 711 $ 16 $ — $ 776 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2023: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Alabama Power Assets: Energy-related derivatives $ — $ 15 $ — $ — $ 15 Nuclear decommissioning trusts: (b) Domestic equity 443 208 — — 651 Foreign equity 145 — — — 145 U.S. Treasury and government agency securities — 20 — — 20 Municipal bonds — 1 — — 1 Corporate bonds — 231 — — 231 Mortgage and asset backed securities — 25 — — 25 Private equity — — — 169 169 Other 8 — — 9 17 Cash equivalents and restricted cash 119 15 — — 134 Other investments — 27 — — 27 Total $ 715 $ 542 $ — $ 178 $ 1,435 Liabilities: Energy-related derivatives $ — $ 110 $ — $ — $ 110 Georgia Power Assets: Energy-related derivatives $ — $ 13 $ — $ — $ 13 Nuclear decommissioning trusts: (b) Domestic equity 321 1 — — 322 Foreign equity — 170 — — 170 U.S. Treasury and government agency securities — 349 — — 349 Municipal bonds — 47 — — 47 Corporate bonds — 158 — — 158 Mortgage and asset backed securities — 64 — — 64 Other 50 3 — — 53 Total $ 371 $ 805 $ — $ — $ 1,176 Liabilities: Energy-related derivatives $ — $ 124 $ — $ — $ 124 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2023: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Mississippi Power Assets: Energy-related derivatives $ — $ 15 $ — $ — $ 15 Cash equivalents 17 — — — 17 Total $ 17 $ 15 $ — $ — $ 32 Liabilities: Energy-related derivatives $ — $ 61 $ — $ — $ 61 Southern Power Assets: Energy-related derivatives $ — $ 3 $ — $ — $ 3 Liabilities: Energy-related derivatives $ — $ 5 $ — $ — $ 5 Foreign currency derivatives — 22 — — 22 Contingent consideration 3 — 16 — 19 Other — 13 — — 13 Total $ 3 $ 40 $ 16 $ — $ 59 Southern Company Gas Assets: Energy-related derivatives (a) $ 6 $ 3 $ — $ — $ 9 Non-qualified deferred compensation trusts: Domestic equity — 7 — — 7 Foreign equity — 1 — — 1 Pooled funds - fixed income — 6 — — 6 Cash and cash equivalents 3 — — — 3 Total $ 9 $ 17 $ — $ — $ 26 Liabilities: Energy-related derivatives (a) $ 46 $ 12 $ — $ — $ 58 Interest rate derivatives — 79 — — 79 Total $ 46 $ 91 $ — $ — $ 137 (a) Excludes cash collateral of $62 million. (b)
Accumulated provisions for the external decommissioning trust funds	At December 31, 2024 and 2023, the accumulated provisions for the external decommissioning trust funds were as follows: 2024 2023 (in millions) Alabama Power Plant Farley $ 1,385 $ 1,259 Georgia Power Plant Hatch $ 735 $ 705 Plant Vogtle Units 1 and 2 460 434 Plant Vogtle Units 3 and 4 41 24 Total $ 1,236 $ 1,163
Estimated costs of decommissioning	The estimated costs of decommissioning at December 31, 2024 based on the most current studies were as follows: Alabama Power Georgia Power Plant Plant Hatch (*) Plant Vogtle Units 1 and 2 (*) Plant Vogtle Unit 3 and 4 (*) Most current study year 2023 2024 2024 2024 Decommissioning periods: Beginning year 2037 2034 2047 2062 Completion year 2087 2088 2092 2074 (in millions) Site study costs: Radiated structures $ 1,402 $ 795 $ 674 $ 599 Spent fuel management 513 306 255 88 Non-radiated structures 133 77 107 89 Total site study costs $ 2,048 $ 1,178 $ 1,036 $ 776 (*) Based on Georgia Power's ownership interests.

CONSOLIDATED ENTITIES AND EQU_2

CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS (Tables)	12 Months Ended
	Dec. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]
Equity method investments	The carrying amounts of Southern Company Gas' equity method investments at December 31, 2024 and 2023 were as follows: Investment Balance December 31, 2024 December 31, 2023 (in millions) SNG $ 1,245 $ 1,202 Other 34 33 Total $ 1,279 $ 1,235

FINANCING (Tables)

FINANCING (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Summary of long-term debt	Details of long-term debt at December 31, 2024 and 2023 are provided in the following table: At December 31, 2024 Balance Outstanding at Maturity Weighted Average 2024 2023 (in millions) Southern Company Senior notes (a) 2025-2074 4.33% $ 44,862 $ 40,235 Junior subordinated notes 2027-2081 4.32% 7,389 8,333 FFB loans (b) 2025-2044 2.88% 4,703 4,788 Revenue bonds (c) 2025-2063 3.15% 3,379 3,400 First mortgage bonds (d) 2025-2064 3.79% 2,775 2,500 Medium-term notes 2026-2027 7.03% 84 84 Other long-term debt 2025-2045 4.96% 209 234 Finance lease obligations (e) 287 298 Unamortized fair value adjustment 275 302 Unamortized debt premium (discount), net (58) (198) Unamortized debt issuance expenses (419) (290) Total long-term debt 63,486 59,686 Less: Amount due within one year 4,718 2,476 Total long-term debt excluding amount due within one year $ 58,768 $ 57,210 Alabama Power Senior notes 2025-2073 3.94% $ 9,875 $ 9,875 Revenue bonds (c) 2025-2063 3.11% 1,300 1,321 Other long-term debt 2026-2030 6.11% 61 75 Finance lease obligations (e) 4 5 Unamortized debt premium (discount), net (19) (20) Unamortized debt issuance expenses (67) (73) Total long-term debt 11,154 11,183 Less: Amount due within one year 655 223 Total long-term debt excluding amount due within one year $ 10,499 $ 10,960 Georgia Power Senior notes 2025-2074 4.49% $ 11,292 $ 9,575 Junior subordinated notes 2077 5.00% 270 270 FFB loans (b) 2025-2044 2.88% 4,703 4,788 Revenue bonds (c) 2025-2062 3.18% 1,968 1,968 Finance lease obligations (e) 261 240 Unamortized debt premium (discount), net (21) (19) Unamortized debt issuance expenses (123) (122) Total long-term debt 18,350 16,700 Less: Amount due within one year 966 502 Total long-term debt excluding amount due within one year $ 17,384 $ 16,198 At December 31, 2024 Balance Outstanding at Maturity Weighted Average 2024 2023 (in millions) Mississippi Power Senior notes 2026-2054 4.33% $ 1,575 $ 1,525 Revenue bonds (c) 2025-2052 3.16% 111 111 Finance lease obligations (e) 14 16 Unamortized debt premium (discount), net 2 1 Unamortized debt issuance expenses (9) (9) Total long-term debt 1,693 1,644 Less: Amount due within one year 12 201 Total long-term debt excluding amount due within one year $ 1,681 $ 1,443 Southern Power Senior notes (a) 2025-2046 4.05% $ 2,695 $ 2,728 Unamortized debt premium (discount), net (4) (4) Unamortized debt issuance expenses (11) (13) Total long-term debt 2,680 2,711 Less: Amount due within one year 500 — Total long-term debt excluding amount due within one year $ 2,180 $ 2,711 Southern Company Gas Senior notes 2025-2051 4.41% $ 5,375 $ 4,930 First mortgage bonds (d) 2025-2064 3.79% 2,775 2,500 Medium-term notes 2026-2027 7.03% 84 84 Other long-term debt 2025-2045 3.81% 68 59 Unamortized fair value adjustment 275 302 Unamortized debt premium (discount), net (9) (8) Unamortized debt issuance expenses (37) (34) Total long-term debt 8,531 7,833 Less: Amount due within one year 302 — Total long-term debt excluding amount due within one year $ 8,229 $ 7,833 (a) Includes a fair value gain (loss) of $(45) million and $(12) million at December 31, 2024 and 2023, respectively, related to Southern Power's foreign currency hedge on its euro-denominated senior notes. (b) Secured by a first priority lien on (i) Georgia Power's undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the units, the related real property, and any nuclear fuel loaded in the reactor core) and (ii) Georgia Power's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4. See "DOE Loan Guarantee Borrowings" herein for additional information. (c) Revenue bond obligations represent loans to the traditional electric operating companies from public authorities of funds derived from sales by such authorities of revenue bonds issued to finance pollution control and solid waste disposal and wastewater facilities. In some cases, the revenue bond obligations represent obligations under installment sales agreements with respect to facilities constructed with the proceeds of revenue bonds issued by public authorities. The traditional electric operating companies are required to make payments sufficient for the authorities to meet principal and interest requirements of such bonds. Proceeds from certain issuances are restricted until qualifying expenditures are incurred. (d) Secured by substantially all of Nicor Gas' properties. (e) Secured by the underlying lease ROU asset. See Note 9 for additional information.
Schedule of maturities of long-term debt for the next five years	Maturities of long-term debt for the next five years are as follows: Southern Company (a) Alabama Power (b) Georgia Power (c) Mississippi Power Southern Power (d) Southern Company (in millions) 2025 $ 4,727 $ 658 $ 967 $ 12 $ 500 $ 300 2026 3,792 47 451 66 964 530 2027 4,075 551 1,015 10 — 154 2028 2,827 107 868 357 — 150 2029 1,990 — 861 1 — 150 (a) See notes (b), (c), and (d) below. (b) Alabama Power's 2025 maturities include $200 million aggregate principal amount of Series 2023A Floating Rate Senior Notes due May 15, 2073 that are repayable at the option of the holders at certain dates that began in 2024. As a result, the senior notes are classified as securities due within one year on the balance sheets of Southern Company and Alabama Power at December 31, 2024. (c) Amounts include principal amortization related to the FFB borrowings; however, the final maturity date is February 20, 2044. See "DOE Loan Guarantee Borrowings" herein for additional information. Georgia Power's 2025 maturities include approximately $117 million aggregate principal amount of Series 2024C Floating Rate Senior Notes due November 15, 2074 that are repayable at the option of the holders at certain dates beginning in 2025. As a result, the senior notes are classified as securities due within one year on the balance sheets of Southern Company and Georgia Power at December 31, 2024. (d) Southern Power's 2026 maturities include $564 million of euro-denominated debt at the U.S. dollar-denominated hedge settlement amount.
Summary of committed credit arrangements	At December 31, 2024, committed credit arrangements with banks were as follows: Expires Company 2025 2026 2027 2029 Total Unused Expires within One Year (in millions) Southern Company parent (a) $ 150 $ — $ — $ 1,850 $ 2,000 $ 1,998 $ 150 Alabama Power (b) — 665 — 700 1,365 1,364 — Georgia Power 300 — — 1,750 2,050 2,026 300 Mississippi Power — — 275 — 275 275 — Southern Power (a)(c) — — — 600 600 600 — Southern Company Gas (d) 100 — — 1,500 1,600 1,598 100 SEGCO 30 — — — 30 30 30 Southern Company $ 580 $ 665 $ 275 $ 6,400 $ 7,920 $ 7,891 $ 580 (a) Arrangement expiring in 2029 represents a $2.45 billion combined arrangement for Southern Company and Southern Power allowing for flexible sublimits. (b) Includes $15 million expiring in 2026 at Alabama Property Company, a wholly-owned subsidiary of Alabama Power, of which $14 million was unused at December 31, 2024. Alabama Power is not party to this arrangement. (c) Does not include Southern Power Company's $75 million and $100 million continuing letter of credit facilities for standby letters of credit, expiring in 2027 and 2026, respectively , of which $16 million and $11 million, respectively, was unused at December 31, 2024. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities. (d) Southern Company Gas, as the parent entity, guarantees the obligations of Southern Company Gas Capital, which is the borrower of $800 million of the credit arrangement expiring in 2029. Southern Company Gas' committed credit arrangement expiring in 2029 also includes $700 million for which Nicor Gas is the borrower and which is restricted for working capital needs of Nicor Gas. Pursuant to the multi-year credit arrangement expiring in 2029, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. Nicor Gas is also the borrower under a $100 million credit arrangement expiring in 2025. See "Structural Considerations" herein for additional information.
Details of short-term borrowings	Details of short-term borrowings for the applicable Registrants were as follows: Notes Payable at December 31, 2024 Notes Payable at December 31, 2023 Amount Weighted Average Amount Weighted Average (in millions) (in millions) Southern Company Commercial paper $ 1,138 4.7 % $ 1,794 5.6 % Short-term bank debt 200 5.3 520 6.4 Total $ 1,338 4.8 % $ 2,314 5.7 % Alabama Power Commercial paper $ — — % $ 40 5.5 % Georgia Power Commercial paper $ — — % $ 809 5.6 % Short-term bank debt 200 5.3 520 6.4 Total $ 200 5.3 % $ 1,329 5.9 % Mississippi Power Commercial paper $ 14 4.6 % $ — — % Southern Power Commercial paper $ — — % $ 138 5.5 % Southern Company Gas Commercial paper: Southern Company Gas Capital $ 283 4.7 % $ 23 5.5 % Nicor Gas 172 4.6 392 5.5 Total $ 455 4.7 % $ 415 5.5 %
Shares used to compute diluted EPS	Shares used to compute diluted EPS were as follows: Average Common Stock Shares 2024 2023 2022 (in millions) As reported shares 1,096 1,092 1,075 Effect of stock-based compensation 6 6 6 Diluted shares 1,102 1,098 1,081
Schedule of preferred stock	Preferred Stock Redeemed During 2022 Par Value/Stated Capital Per Share Shares Redemption 4.92% Preferred Stock $100 80,000 $103.23 4.72% Preferred Stock $100 50,000 $102.18 4.64% Preferred Stock $100 60,000 $103.14 4.60% Preferred Stock $100 100,000 $104.20 4.52% Preferred Stock $100 50,000 $102.93 4.20% Preferred Stock $100 135,115 $105.00 5.00% Class A Preferred Stock $25 10,000,000 $25.00

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Major categories of lease obligations	The major categories of lease obligations are as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) At December 31, 2024 Electric generating units (*) $ 672 $ 56 $ 1,509 $ — $ — $ — Real estate/land 834 3 45 2 540 20 Communication towers 118 2 4 — — 21 Railcars 64 31 29 4 — — Other 52 2 2 16 — — Total $ 1,740 $ 94 $ 1,589 $ 22 $ 540 $ 41 At December 31, 2023 Electric generating units (*) $ 670 $ 58 $ 1,028 $ — $ — $ — Real estate/land 871 4 54 2 546 28 Communication towers 123 1 4 — — 23 Railcars 64 32 27 5 — — Other 60 3 2 18 — — Total $ 1,788 $ 98 $ 1,115 $ 25 $ 546 $ 51 (*) Amounts related to affiliate leases are eliminated in consolidation for Southern Company. See "Contracts that Contain a Lease" herein for additional information.
Balance sheet amounts recorded for operating and financing leases	Balance sheet amounts recorded for operating and finance leases are as follows: Southern Company Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) At December 31, 2024 Operating Leases Operating lease ROU assets, net $ 1,386 $ 84 $ 1,331 $ 8 $ 484 $ 38 Operating lease obligations - current $ 200 $ 14 $ 169 $ 4 $ 29 $ 11 Operating lease obligations - non-current 1,253 76 1,159 4 511 30 Total operating lease obligations (*) $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance Leases Finance lease ROU assets, net $ 254 $ 4 $ 227 $ 14 $ — $ — Finance lease obligations - current $ 9 $ 1 $ 20 $ 1 $ — $ — Finance lease obligations - non-current 278 3 241 13 — — Total finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ — At December 31, 2023 Operating Leases Operating lease ROU assets, net $ 1,432 $ 87 $ 884 $ 9 $ 488 $ 47 Operating lease obligations - current $ 183 $ 12 $ 135 $ 3 $ 29 $ 11 Operating lease obligations - non-current 1,307 81 740 6 517 40 Total operating lease obligations (*) $ 1,490 $ 93 $ 875 $ 9 $ 546 $ 51 Finance Leases Finance lease ROU assets, net $ 272 $ 5 $ 203 $ 15 $ — $ — Finance lease obligations - current $ 11 $ 2 $ 18 $ 1 $ — $ — Finance lease obligations - non-current 287 3 222 15 — — Total finance lease obligations $ 298 $ 5 $ 240 $ 16 $ — $ — (*) Includes operating lease obligations related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $567 million, $55 million, and $1.3 billion, respectively, at December 31, 2024 and $566 million, $58 million, and $813 million, respectively, at December 31, 2023.
Lease costs and other information	Lease costs for 2024, 2023, and 2022, which includes both amounts recognized as operations and maintenance expense and amounts capitalized as part of the cost of another asset, are as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease cost Operating lease cost (*) $ 248 $ 19 $ 190 $ 4 $ 27 $ 12 Finance lease cost: Amortization of ROU assets 20 2 23 1 — — Interest on lease obligations 15 — 15 1 — — Total finance lease cost 35 2 38 2 — — Short-term lease costs 37 15 15 — — — Variable lease cost 48 (1) 77 — 4 — Total lease cost $ 368 $ 35 $ 320 $ 6 $ 31 $ 12 2023 Lease cost Operating lease cost (*) $ 252 $ 16 $ 192 $ 5 $ 34 $ 12 Finance lease cost: Amortization of ROU assets 24 2 19 1 — — Interest on lease obligations 14 — 17 — — — Total finance lease cost 38 2 36 1 — — Short-term lease costs 40 16 16 — — — Variable lease cost 47 — 74 — 4 — Total lease cost $ 377 $ 34 $ 318 $ 6 $ 38 $ 12 2022 Lease cost Operating lease cost (*) $ 297 $ 59 $ 198 $ 5 $ 32 $ 15 Finance lease cost: Amortization of ROU assets 23 1 15 1 — — Interest on lease obligations 13 — 17 1 — — Total finance lease cost 36 1 32 2 — — Short-term lease costs 64 44 13 — — — Variable lease cost 125 13 105 — 5 — Sublease income (1) — — — — — Total lease cost $ 521 $ 117 $ 348 $ 7 $ 37 $ 15 (*) Includes operating lease costs related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $108 million, $5 million, and $168 million, respectively, in 2024, $112 million, $4 million, and $174 million, respectively, in 2023, and $162 million, $48 million, and $180 million, respectively, in 2022. Other information with respect to cash and noncash activities related to leases, as well as weighted-average lease terms and discount rates, is as follows: Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) 2024 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 243 $ 19 $ 186 $ 4 $ 33 $ 12 Operating cash flows from finance leases 15 — 21 — — — Financing cash flows from finance leases 11 2 23 1 — — ROU assets obtained under operating leases 146 11 609 — 10 1 Reassessment of ROU assets under operating leases (7) — — — (7) — ROU assets obtained under finance leases 1 — 44 — — — 2023 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 253 $ 17 $ 199 $ 5 $ 33 $ 12 Operating cash flows from finance leases 15 — 22 — — — Financing cash flows from finance leases 18 2 16 1 — — ROU assets obtained under operating leases 100 30 26 1 7 7 ROU assets obtained under finance leases 3 3 18 — — — 2022 Other information Cash paid for amounts included in the measurements of lease obligations: Operating cash flows from operating leases $ 303 $ 58 $ 206 $ 5 $ 30 $ 14 Operating cash flows from finance leases 11 — 20 1 — — Financing cash flows from finance leases 16 1 10 1 — — ROU assets obtained under operating leases 56 10 17 9 — 3 Reassessment of ROU assets under operating leases 16 — — — 16 — ROU assets obtained under finance leases 118 2 116 — — — Southern Alabama Georgia Mississippi Southern Power Southern Company Gas At December 31, 2024 Weighted-average remaining lease term in years: Operating leases 16.4 10.2 7.9 4.3 32.3 6.8 Finance leases 16.0 2.7 10.1 10.9 N/A N/A Weighted-average discount rate: Operating leases 4.73 % 5.04 % 4.73 % 3.83 % 4.88 % 3.84 % Finance leases 4.86 % 4.05 % 5.8 % 2.74 % N/A N/A At December 31, 2023 Weighted-average remaining lease term in years: Operating leases 17.2 11.1 7.5 4.6 33.1 7.0 Finance leases 16.7 4.3 10.6 11.9 N/A N/A Weighted-average discount rate: Operating leases 4.68 % 5.02 % 4.58 % 3.67 % 4.89 % 3.80 % Finance leases 4.85 % 3.93 % 5.95 % 2.74 % N/A N/A
Maturities of operating lease liabilities	Maturities of lease liabilities are as follows: At December 31, 2024 Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Maturity Analysis Operating leases: 2025 $ 239 $ 18 $ 228 $ 4 $ 31 $ 12 2026 212 15 224 3 29 9 2027 190 12 223 1 29 4 2028 170 9 217 — 29 3 2029 138 7 196 — 30 4 Thereafter 1,255 56 511 1 978 15 Total 2,204 117 1,599 9 1,126 47 Less: Present value discount 751 27 271 1 586 6 Operating lease obligations $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance leases: 2025 $ 28 $ 2 $ 39 $ 2 $ — $ — 2026 27 1 41 2 — — 2027 26 1 41 1 — — 2028 25 — 42 1 — — 2029 25 — 42 1 — — Thereafter 290 — 139 9 — — Total 421 4 344 16 — — Less: Present value discount 134 — 83 2 — — Finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ —
Maturities of finance lease liabilities	Maturities of lease liabilities are as follows: At December 31, 2024 Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Maturity Analysis Operating leases: 2025 $ 239 $ 18 $ 228 $ 4 $ 31 $ 12 2026 212 15 224 3 29 9 2027 190 12 223 1 29 4 2028 170 9 217 — 29 3 2029 138 7 196 — 30 4 Thereafter 1,255 56 511 1 978 15 Total 2,204 117 1,599 9 1,126 47 Less: Present value discount 751 27 271 1 586 6 Operating lease obligations $ 1,453 $ 90 $ 1,328 $ 8 $ 540 $ 41 Finance leases: 2025 $ 28 $ 2 $ 39 $ 2 $ — $ — 2026 27 1 41 2 — — 2027 26 1 41 1 — — 2028 25 — 42 1 — — 2029 25 — 42 1 — — Thereafter 290 — 139 9 — — Total 421 4 344 16 — — Less: Present value discount 134 — 83 2 — — Finance lease obligations $ 287 $ 4 $ 261 $ 14 $ — $ —
Lease income, operating leases	Lease income for 2024, 2023, and 2022, is as follows: Southern Alabama Power Georgia Power Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 15 $ 9 $ — Lease income - operating leases 136 9 28 3 88 36 Variable lease income 417 1 — — 450 — Total lease income $ 577 $ 10 $ 28 $ 18 $ 547 $ 36 2023 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 14 $ 10 $ — Lease income - operating leases 164 35 29 2 85 37 Variable lease income 406 1 — — 437 — Total lease income $ 594 $ 36 $ 29 $ 16 $ 532 $ 37 2022 Lease income - interest income on sales-type leases $ 25 $ — $ — $ 15 $ 10 $ — Lease income - operating leases 208 77 32 2 85 36 Variable lease income 417 1 — — 448 — Total lease income $ 650 $ 78 $ 32 $ 17 $ 543 $ 36
Lease income, sales-type leases and Power Purchase Agreements	Lease income for 2024, 2023, and 2022, is as follows: Southern Alabama Power Georgia Power Mississippi Southern Power Southern Company Gas (in millions) 2024 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 15 $ 9 $ — Lease income - operating leases 136 9 28 3 88 36 Variable lease income 417 1 — — 450 — Total lease income $ 577 $ 10 $ 28 $ 18 $ 547 $ 36 2023 Lease income - interest income on sales-type leases $ 24 $ — $ — $ 14 $ 10 $ — Lease income - operating leases 164 35 29 2 85 37 Variable lease income 406 1 — — 437 — Total lease income $ 594 $ 36 $ 29 $ 16 $ 532 $ 37 2022 Lease income - interest income on sales-type leases $ 25 $ — $ — $ 15 $ 10 $ — Lease income - operating leases 208 77 32 2 85 36 Variable lease income 417 1 — — 448 — Total lease income $ 650 $ 78 $ 32 $ 17 $ 543 $ 36
Undiscounted cash flows to be received under tolling arrangements accounted for as sales-type leases	The undiscounted cash flows expected to be received for in-service leased assets under the leases are as follows: At December 31, 2024 Southern Company Mississippi Power Southern (in millions) 2025 $ 52 $ 24 $ 15 2026 38 23 15 2027 37 22 15 2028 36 21 15 2029 35 20 15 Thereafter 302 132 170 Total undiscounted cash flows $ 500 $ 242 $ 245 Net investment in sales-type lease (*) 297 139 158 Difference between undiscounted cash flows and discounted cash flows $ 203 $ 103 $ 87 (*) For Mississippi Power, included in other current assets ($10 million and $10 million at December 31, 2024 and 2023, respectively) and other property and investments ($129 million and $138 million at December 31, 2024 and 2023, respectively) on the balance sheets. For Southern Power, included in other current assets ($15 million and $15 million at December 31, 2024 and 2023, respectively) and net investment in sales-type leases ($143 million and $148 million at December 31, 2024 and 2023, respectively) on the balance sheets.
Undiscounted cash flows to be received under PPAs accounted for as operating leases	The undiscounted cash flows to be received under operating leases and contracts accounted for as operating leases are as follows: At December 31, 2024 Southern Alabama Southern Southern Company Gas (in millions) 2025 $ 117 $ 6 $ 142 $ 35 2026 111 5 148 29 2027 109 4 150 28 2028 109 4 161 28 2029 112 3 164 28 Thereafter 621 31 506 326 Total $ 1,179 $ 53 $ 1,271 $ 474

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Details of income tax provisions	Details of income tax provisions are as follows: 2024 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Federal — Current $ 221 $ 357 $ 200 $ 32 $ (112) $ 84 Deferred 387 (111) 211 2 106 86 Total federal 608 246 411 34 (6) 170 State — Current 152 103 52 (1) 6 42 Deferred 209 11 140 14 (13) 46 Total state 361 114 192 13 (7) 88 Total $ 969 $ 360 $ 603 $ 47 $ (13) $ 258 2023 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Federal — Current $ 54 $ 242 $ 205 $ 49 $ (320) $ 62 Deferred 299 (257) 195 (26) 334 68 Total federal 353 (15) 400 23 14 130 State — Current 41 82 37 1 (1) 24 Deferred 102 14 11 12 (1) 57 Total state 143 96 48 13 (2) 81 Total $ 496 $ 81 $ 448 $ 36 $ 12 $ 211 2022 Southern Company Alabama Power Georgia Mississippi Southern Power Southern Company Gas (in millions) Federal — Current $ 10 $ 54 $ 38 $ 42 $ (43) $ 122 Deferred 455 259 152 (16) 56 (3) Total federal 465 313 190 26 13 119 State — Current 27 14 (21) — 2 42 Deferred 303 96 201 11 5 19 Total state 330 110 180 11 7 61 Total $ 795 $ 423 $ 370 $ 37 $ 20 $ 180
Summary of amortization of tax credits	ITCs amortized in 2024, 2023, and 2022 were immaterial for the traditional electric operating companies and Southern Company Gas and were as follows for Southern Company and Southern Power: Southern Company Southern Power (in millions) 2024 $ 109 $ 58 2023 84 58 2022 83 58
Schedule of effective income tax reconciliation	A reconciliation of the federal statutory income tax rate to the effective income tax (benefit) rate is as follows: 2024 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas Federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % State income tax, net of federal deduction 3.6 5.0 1.7 4.4 (2.3) 7.0 Changes in valuation allowance, net of federal benefit 1.9 — 3.1 — — — Employee stock plans' dividend deduction (0.4) — — — — — Non-deductible book depreciation 0.6 0.6 0.7 0.3 — — Flowback of excess deferred income taxes (3.9) (5.3) (2.2) (6.5) — (2.2) AFUDC-Equity (0.8) (0.7) (1.0) — — — Federal PTCs (2.8) (0.1) (3.7) — (17.2) — ITC amortization (1.2) (0.1) (0.2) — (26.4) — Noncontrolling interests 0.6 — — — 17.1 — Other (0.1) — (0.2) — 0.2 — Effective income tax (benefit) rate 18.5 % 20.4 % 19.2 % 19.2 % (7.6) % 25.8 % 2023 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas Federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % State income tax, net of federal deduction 2.9 5.2 2.1 4.9 (0.7) 7.8 Changes in valuation allowance, net of federal benefit (0.3) — (0.6) — — — Employee stock plans' dividend deduction (0.5) — — — — — Non-deductible book depreciation 0.7 0.7 0.8 0.4 — — Flowback of excess deferred income taxes (9.2) (19.8) (2.6) (10.2) — (2.6) AFUDC-Equity (1.1) (1.2) (1.2) — — — Federal PTCs (1.2) — (1.4) — (7.4) — ITC amortization (1.3) (0.1) (0.1) — (19.0) — Noncontrolling interests 0.6 — — — 11.1 — Other (0.2) (0.2) (0.3) 0.1 0.1 (0.6) Effective income tax rate 11.4 % 5.6 % 17.7 % 16.2 % 5.1 % 25.6 % 2022 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas Federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % State income tax, net of federal deduction 7.8 4.8 3.3 4.4 1.9 6.4 Changes in valuation allowance, net of federal benefit (1.6) — 3.2 — — — Employee stock plans' dividend deduction (0.5) — — — — — Non-deductible book depreciation 0.6 0.5 0.6 0.3 — — Flowback of excess deferred income taxes (6.6) (1.9) (9.6) (7.8) — (2.5) AFUDC-Equity (1.1) (0.8) (1.5) — — — Federal PTCs — — — — (6.6) — ITC amortization (1.3) (0.1) (0.1) — (17.2) (0.1) Noncontrolling interests 0.5 — — — 8.4 — Other — 0.3 — 0.3 (0.1) (0.9) Effective income tax rate 18.8 % 23.8 % 16.9 % 18.2 % 7.4 % 23.9 %
Tax effects between the carrying amounts of assets and liabilities	The tax effects of temporary differences between the carrying amounts of assets and liabilities in the financial statements of the Registrants and their respective tax bases, which give rise to deferred tax assets and liabilities, are as follows: December 31, 2024 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Deferred tax liabilities — Accelerated depreciation $ 9,828 $ 2,583 $ 3,810 $ 344 $ 1,309 $ 1,575 Property basis differences 3,025 1,497 918 192 — 412 Employee benefit obligations 1,067 362 470 54 13 60 AROs 727 458 221 — — — Under recovered fuel and natural gas costs 318 13 305 — — — Regulatory assets – AROs 1,886 658 1,193 35 — — Employee benefit obligations 746 191 237 35 — 35 Remaining book value of retired assets 360 168 187 5 — — Storm damage reserves 216 — 216 — — — Premium on reacquired debt 57 8 48 1 — — Other 678 171 187 61 1 201 Total deferred income tax liabilities 18,908 6,109 7,792 727 1,323 2,283 Deferred tax assets — AROs 2,613 1,116 1,414 35 — — CAMT carryforwards 40 — 18 — — 104 ITC and PTC carryforwards 1,380 48 719 — 384 — Employee benefit obligations 897 196 279 49 16 87 Estimated loss on plants under construction 773 — 773 — — — Estimated loss on regulatory disallowance 20 — — — — 20 Other state deferred tax attributes 366 — 26 224 49 16 Federal effect of net state deferred tax liabilities 402 197 100 — 23 107 Other property basis differences 176 — 75 — 85 — State effect of federal deferred taxes 126 126 — — — — Other partnership basis differences 60 — — — 60 — Regulatory liability associated with the Tax Reform Legislation (not subject to normalization) 18 18 — — — — Long-term debt fair value adjustment 73 — — — — 73 Other comprehensive losses 48 3 — — 1 — Other 601 227 160 50 20 86 Total deferred income tax assets 7,593 1,931 3,564 358 638 493 Valuation allowance (333) — (157) (41) (27) (6) Net deferred income tax assets 7,260 1,931 3,407 317 611 487 Net deferred income taxes (assets)/liabilities $ 11,648 $ 4,178 $ 4,385 $ 410 $ 712 $ 1,796 Recognized in the balance sheets: Accumulated deferred income taxes – assets $ (82) $ — $ — $ (82) $ — $ — Accumulated deferred income taxes – liabilities $ 11,730 $ 4,178 $ 4,385 $ 492 $ 712 $ 1,796 December 31, 2023 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Deferred tax liabilities — Accelerated depreciation $ 9,683 $ 2,566 $ 3,628 $ 339 $ 1,346 $ 1,576 Property basis differences 2,647 1,444 812 188 — 189 Employee benefit obligations 979 321 446 49 12 74 AROs 833 476 314 — — — Under recovered fuel and natural gas costs 601 80 508 13 — — Regulatory assets – AROs 1,902 667 1,196 39 — — Employee benefit obligations 797 213 260 37 — 11 Remaining book value of retired assets 369 143 221 5 — — Premium on reacquired debt 63 9 53 1 — — Other 700 182 223 43 2 191 Total deferred income tax liabilities 18,574 6,101 7,661 714 1,360 2,041 Deferred tax assets — AROs 2,735 1,143 1,510 39 — — ITC and PTC carryforwards 1,387 12 691 — 481 — Employee benefit obligations 985 224 316 52 10 89 Estimated loss on plants under construction 857 — 857 — — — Estimated loss on regulatory disallowance 26 — — — — 26 Other state deferred tax attributes 363 — 13 231 49 8 Federal effect of net state deferred tax liabilities 418 215 92 — 27 101 Other property basis differences 197 — 83 — 97 — State effect of federal deferred taxes 115 115 — — — — Other partnership basis differences 85 — — — 85 — Regulatory liability associated with the Tax Reform Legislation (not subject to normalization) 34 30 — 3 — — Long-term debt fair value adjustment 79 — — — — 79 Other comprehensive losses 67 4 4 — 6 — Other 538 188 152 57 18 74 Total deferred income tax assets 7,886 1,931 3,718 382 773 377 Valuation allowance (206) — (75) (41) (27) (7) Net deferred income tax assets 7,680 1,931 3,643 341 746 370 Net deferred income taxes (assets)/liabilities $ 10,894 $ 4,170 $ 4,018 $ 373 $ 614 $ 1,671 Recognized in the balance sheets: Accumulated deferred income taxes – assets $ (96) $ — $ — $ (96) $ — $ — Accumulated deferred income taxes – liabilities $ 10,990 $ 4,170 $ 4,018 $ 469 $ 614 $ 1,671
Summary of tax credit carryforwards	Federal ITC/PTC carryforwards at December 31, 2024 were as follows: Southern Company Alabama Georgia Southern (in millions) Federal ITC/PTC carryforwards $ 765 $ 48 $ 147 $ 384 Tax year in which federal ITC/PTC carryforwards begin expiring 2031 2032 2031 2035 Year by which federal ITC/PTC carryforwards are expected to be utilized 2028 2028 2028 2028
Summary of operating loss carryforward	At December 31, 2024, the net state income tax benefit of state and local NOL carryforwards and associated valuation allowances for Southern Company's subsidiaries were as follows: Company/Jurisdiction Approximate Net State Income Tax Benefit of NOL Carryforwards Tax Year NOL Net State Valuation Allowance for NOL Carryforwards (in millions) (in millions) Mississippi Power Mississippi $ 178 2032 $ (32) Southern Power Oklahoma $ 26 2035 $ (11) Florida 10 2034 (10) Other states 2 2034 — Southern Power Total $ 38 $ (21) Other (*) New York $ 11 2036 $ (11) New York City 14 2036 (14) Other states 24 2025 (4) Southern Company Total $ 265 $ (82) (*) Represents other non-registrant Southern Company subsidiaries. Alabama Power, Georgia Power, and Southern Company Gas did not have material state or local NOL carryforwards at December 31, 2024.
Schedule of unrecognized tax benefits	Changes in unrecognized tax benefits for the periods presented were as follows: Southern Company Georgia Power Southern (in millions) Unrecognized tax benefits at December 31, 2021 $ 47 $ — $ — Tax positions changes — Increase from prior periods 33 — 32 Unrecognized tax benefits at December 31, 2022 80 — 32 Tax positions changes — Increase from prior periods 88 86 2 Statute of limitations expiration (52) (9) — Unrecognized tax benefits at December 31, 2023 116 77 34 Tax positions changes — Increase from prior periods 10 — 10 Decrease from prior periods (44) (43) — Unrecognized tax benefits at December 31, 2024 $ 82 $ 34 $ 44

RETIREMENT BENEFITS (Tables)

RETIREMENT BENEFITS (Tables)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Summary of actuarial assumptions	The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and other postretirement benefit plans for the following year and the benefit obligations as of the measurement date are presented below. 2024 Assumptions used to determine net Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas Pension plans Discount rate – benefit obligations 5.07 % 5.08 % 5.06 % 5.06 % 5.14 % 5.05 % Discount rate – interest costs 4.94 4.94 4.94 4.93 5.01 4.93 Discount rate – service costs 5.19 5.20 5.21 5.19 5.20 5.13 Expected long-term return on plan assets 8.30 8.30 8.30 8.30 8.30 8.30 Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 Other postretirement benefit plans Discount rate – benefit obligations 4.99 % 5.01 % 4.98 % 4.98 % 5.06 % 4.98 % Discount rate – interest costs 4.90 4.90 4.89 4.90 4.94 4.89 Discount rate – service costs 5.16 5.17 5.16 5.16 5.14 5.16 Expected long-term return on plan assets 7.67 7.97 7.59 7.43 — 6.36 Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 2023 Assumptions used to determine net Southern Company Alabama Georgia Mississippi Power Southern Power Southern Company Gas Pension plans Discount rate – benefit obligations 5.25 % 5.26 % 5.25 % 5.25 % 5.31 % 5.24 % Discount rate – interest costs 5.13 5.14 5.12 5.12 5.19 5.12 Discount rate – service costs 5.36 5.38 5.38 5.37 5.37 5.31 Expected long-term return on plan assets 8.40 8.40 8.40 8.40 8.40 8.40 Annual salary increase 4.80 4.80 4.80 4.80 4.80 4.80 Other postretirement benefit plans Discount rate – benefit obligations 5.18 % 5.20 % 5.17 % 5.17 % 5.24 % 5.16 % Discount rate – interest costs 5.08 5.09 5.07 5.08 5.12 5.07 Discount rate – service costs 5.34 5.35 5.34 5.33 5.33 5.33 Expected long-term return on plan assets 7.67 7.95 7.49 7.43 — 6.59 Annual salary increase 4.80 4.80 4.80 4.80 4.80 4.80 2022 Assumptions used to determine net periodic costs: Southern Company Alabama Georgia Mississippi Power Southern Power Southern Company Gas Pension plans Discount rate – benefit obligations 3.09 % 3.12 % 3.07 % 3.07 % 3.21 % 3.04 % Discount rate – interest costs 2.55 2.58 2.51 2.54 2.79 2.53 Discount rate – service costs 3.34 3.36 3.37 3.35 3.36 3.21 Expected long-term return on plan assets 8.25 8.25 8.25 8.25 8.25 8.25 Annual salary increase 4.80 4.80 4.80 4.80 4.80 4.80 Other postretirement benefit plans Discount rate – benefit obligations 2.90 % 2.95 % 2.87 % 2.88 % 3.07 % 2.82 % Discount rate – interest costs 2.32 2.38 2.30 2.27 2.55 2.17 Discount rate – service costs 3.26 3.30 3.27 3.26 3.25 3.22 Expected long-term return on plan assets 7.21 7.54 6.88 7.22 — 6.08 Annual salary increase 4.80 4.80 4.80 4.80 4.80 4.80 2024 Assumptions used to determine benefit obligations: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas Pension plans Discount rate 5.76 % 5.78 % 5.75 % 5.76 % 5.84 % 5.73 % Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 Other postretirement benefit plans Discount rate 5.64 % 5.67 % 5.61 % 5.63 % 5.73 % 5.62 % Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 2023 Assumptions used to determine benefit obligations: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas Pension plans Discount rate 5.07 % 5.08 % 5.06 % 5.06 % 5.14 % 5.05 % Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60 Other postretirement benefit plans Discount rate 4.99 % 5.01 % 4.98 % 4.98 % 5.06 % 4.98 % Annual salary increase 4.60 4.60 4.60 4.60 4.60 4.60
Schedule of health care cost trend rates	The weighted average medical care cost trend rates used in measuring the APBO for the Registrants at December 31, 2024 were as follows: Initial Cost Trend Rate Ultimate Cost Trend Rate Year That Ultimate Rate is Reached Pre-65 8.00 % 4.50 % 2033 Post-65 medical 5.50 4.50 2033 Post-65 prescription 11.00 4.50 2033
Schedule of accumulated and projected benefit obligations	The total accumulated benefit obligation for the pension plans at December 31, 2024 and 2023 was as follows: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) December 31, 2024 $ 11,437 $ 2,617 $ 3,438 $ 519 $ 140 $ 779 December 31, 2023 11,991 2,746 3,674 546 145 808 The projected benefit obligations for the qualified and non-qualified pension plans at December 31, 2024 are shown in the following table. All pension plan assets are related to the qualified pension plan. Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Projected benefit obligations: Qualified pension plan $ 11,886 $ 2,794 $ 3,622 $ 540 $ 146 $ 788 Non-qualified pension plan 678 114 111 27 21 54
Amounts recognized in balance sheets	Amounts recognized in the balance sheets at December 31, 2024 and 2023 related to the Registrants' pension plans consist of the following: Southern Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) December 31, 2024: Prepaid pension costs (a) $ 2,674 $ 746 $ 897 $ 124 $ 41 $ 191 Other regulatory assets, deferred (b) 2,708 741 973 144 — 126 Other current liabilities (68) (13) (13) (2) (2) (4) Employee benefit obligations (c) (611) (102) (98) (25) (18) (51) Other regulatory liabilities, deferred (50) — — — — — AOCI 52 — — — 11 (54) December 31, 2023: Prepaid pension costs (a) $ 2,079 $ 585 $ 706 $ 99 $ 31 $ 158 Other regulatory assets, deferred (b) 2,960 821 1,051 152 — 143 Other current liabilities (64) (11) (13) (2) (2) (3) Employee benefit obligations (c) (649) (106) (131) (27) (21) (58) Other regulatory liabilities, deferred (47) — — — — — AOCI 79 — — — 20 (45) (a) Included in prepaid pension and other postretirement benefit costs on Alabama Power's balance sheet and other deferred charges and assets on Southern Power's consolidated balance sheet. (b) Amounts for Southern Company exclude regulatory assets of $155 million and $173 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company. (c) Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets. Presented below are the amounts included in regulatory assets at December 31, 2024 and 2023 related to the portion of the defined benefit pension plan attributable to Southern Company, the traditional electric operating companies, and Southern Company Gas that had not yet been recognized in net periodic pension cost. Southern Alabama Power Georgia Mississippi Power Southern Company Gas (in millions) Balance at December 31, 2024 Regulatory assets: Prior service cost $ 8 $ 3 $ 5 $ 1 $ (4) Net loss 2,650 738 968 143 91 Regulatory amortization — — — — 39 Total regulatory assets (*) $ 2,658 $ 741 $ 973 $ 144 $ 126 Balance at December 31, 2023 Regulatory assets: Prior service cost $ 9 $ 4 $ 6 $ 1 $ (7) Net loss 2,904 817 1,045 151 100 Regulatory amortization — — — — 50 Total regulatory assets (*) $ 2,913 $ 821 $ 1,051 $ 152 $ 143 (*) Amounts for Southern Company exclude regulatory assets of $155 million and $173 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company. Amounts recognized in the balance sheets at December 31, 2024 and 2023 related to the Registrants' other postretirement benefit plans consist of the following: Southern Company Alabama Power Georgia Mississippi Power Southern Southern Company Gas (in millions) December 31, 2024: Prepaid other postretirement benefit costs (a) $ — $ 95 $ — $ — $ — $ — Other regulatory assets, deferred (b) 24 — 3 — — — Other current liabilities (6) — — — (1) — Employee benefit obligations (c) (212) — (68) (31) (8) (15) Other regulatory liabilities, deferred (213) (45) (67) (9) — (84) AOCI (14) — — — — (15) December 31, 2023: Prepaid other postretirement benefit costs (a) $ — $ 74 $ — $ — $ — $ — Other regulatory assets, deferred (b) 23 — 11 — — — Other current liabilities (6) — — — (1) — Employee benefit obligations (c) (285) — (79) (32) (8) (44) Other regulatory liabilities, deferred (231) (48) (85) (10) — (68) AOCI (9) — — — 1 (10) (a) Included in prepaid pension and other postretirement benefit costs on Alabama Power's balance sheet. (b) Amounts for Southern Company exclude regulatory assets of $16 million and $24 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company. (c) Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets. Presented below are the amounts included in net regulatory assets (liabilities) at December 31, 2024 and 2023 related to the other postretirement benefit plans of Southern Company, the traditional electric operating companies, and Southern Company Gas that had not yet been recognized in net periodic other postretirement benefit cost. Southern Company Alabama Power Georgia Mississippi Power Southern Company Gas (in millions) Balance at December 31, 2024: Regulatory assets (liabilities): Prior service cost $ 11 $ 3 $ 4 $ 1 $ — Net gain (200) (48) (68) (10) (71) Regulatory amortization — — — — (13) Total regulatory assets (liabilities) (*) $ (189) $ (45) $ (64) $ (9) $ (84) Balance at December 31, 2023: Regulatory assets (liabilities): Prior service cost $ 13 $ 4 $ 5 $ 1 $ — Net gain (216) (52) (79) (11) (64) Regulatory amortization — — — — (4) Total regulatory assets (liabilities) (*) $ (203) $ (48) $ (74) $ (10) $ (68) (*) Amounts for Southern Company exclude regulatory assets of $16 million and $24 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.
Changes in projected benefit obligations and fair value of plan assets	Changes in the projected benefit obligations and the fair value of plan assets during the plan years ended December 31, 2024 and 2023 were as follows: 2024 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Change in benefit obligation Benefit obligation at beginning of year $ 13,252 $ 3,076 $ 4,009 $ 599 $ 177 $ 882 Service cost 292 68 70 12 7 28 Interest cost 635 148 191 29 9 42 Benefits paid (728) (162) (239) (33) (6) (46) Actuarial gain (887) (222) (298) (40) (20) (64) Balance at end of year 12,564 2,908 3,733 567 167 842 Change in plan assets Fair value of plan assets at beginning of year 14,618 3,544 4,571 669 185 980 Actual return on plan assets 604 148 152 23 7 39 Employer contributions 65 9 35 5 2 5 Benefits paid (728) (162) (239) (33) (6) (46) Fair value of plan assets at end of year 14,559 3,539 4,519 664 188 978 Accrued asset $ 1,995 $ 631 $ 786 $ 97 $ 21 $ 136 2023 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Change in benefit obligation Benefit obligation at beginning of year $ 12,602 $ 2,906 $ 3,851 $ 569 $ 163 $ 868 Service cost 275 64 68 11 6 24 Interest cost 626 145 191 28 8 42 Benefits paid (744) (155) (224) (32) (6) (104) Actuarial loss 493 116 123 23 6 52 Balance at end of year 13,252 3,076 4,009 599 177 882 Change in plan assets Fair value of plan assets at beginning of year 14,218 3,427 4,456 649 178 1,002 Actual return on plan assets 1,092 260 331 50 12 79 Employer contributions 52 11 9 2 2 3 Benefits paid (744) (154) (225) (32) (7) (104) Fair value of plan assets at end of year 14,618 3,544 4,571 669 185 980 Accrued asset $ 1,366 $ 468 $ 562 $ 70 $ 8 $ 98
Components of net periodic benefit cost	Components of net periodic pension cost for the Registrants were as follows: Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) 2024 Service cost $ 292 $ 68 $ 70 $ 12 $ 7 $ 28 Interest cost 635 148 191 29 9 42 Expected return on plan assets (1,263) (307) (393) (58) (17) (85) Recognized net loss (*) 55 16 19 3 — — Net amortization (*) — 1 1 — — 15 Prior service cost (*) — — — — — (3) Net periodic pension income $ (281) $ (74) $ (112) $ (14) $ (1) $ (3) 2023 Service cost $ 275 $ 64 $ 68 $ 11 $ 6 $ 24 Interest cost 626 145 191 28 8 42 Expected return on plan assets (1,229) (297) (385) (56) (15) (85) Recognized net (gain) loss (*) 32 9 13 2 — (5) Net amortization (*) — 1 1 — — 15 Prior service cost (*) — — — — — (3) Net periodic pension income $ (296) $ (78) $ (112) $ (15) $ (1) $ (12) 2022 Service cost $ 412 $ 99 $ 103 $ 17 $ 9 $ 34 Interest cost 408 96 123 18 6 28 Expected return on plan assets (1,265) (306) (399) (57) (15) (91) Recognized net loss (*) 240 62 75 11 2 8 Net amortization (*) — 1 1 — — 15 Prior service cost (*) — — — — — (3) Net periodic pension cost (income) $ (205) $ (48) $ (97) $ (11) $ 2 $ (9) (*) For Southern Company, excludes amounts related to net periodic pension cost of $20 million, $17 million, and $21 million for the years ended December 31, 2024, 2023, and 2022, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company. Components of the other postretirement benefit plans' net periodic cost for the Registrants were as follows: Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) 2024 Service cost $ 15 $ 4 $ 4 $ 1 $ — $ 1 Interest cost 65 16 23 3 — 8 Expected return on plan assets (89) (35) (32) (3) 1 (13) Net amortization (*) (13) (3) (4) — — 6 Net periodic other postretirement benefit cost (income) $ (22) $ (18) $ (9) $ 1 $ 1 $ 2 2023 Service cost $ 15 $ 4 $ 4 $ 1 $ — $ 1 Interest cost 70 17 25 3 — 9 Expected return on plan assets (83) (33) (29) (3) 1 (10) Net amortization (*) (11) (3) (3) — — 6 Net periodic other postretirement benefit cost (income) $ (9) $ (15) $ (3) $ 1 $ 1 $ 6 2022 Service cost $ 23 $ 6 $ 6 $ 1 $ — $ 1 Interest cost 42 10 15 2 — 5 Expected return on plan assets (80) (32) (28) (2) 1 (9) Net amortization (*) (1) — 2 — — 6 Net periodic other postretirement benefit cost (income) $ (16) $ (16) $ (5) $ 1 $ 1 $ 3 (*) For Southern Company, excludes amounts related to net periodic other postretirement benefit cost of $8 million for all years presented associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.
Estimated pension benefit payments	At December 31, 2024, estimated benefit payments were as follows: Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Benefit Payments: 2025 $ 773 $ 170 $ 245 $ 34 $ 7 $ 58 2026 801 177 250 36 8 60 2027 823 183 254 37 8 62 2028 842 187 258 38 7 64 2029 862 192 262 38 8 66 2030 to 2034 4,529 1,013 1,333 204 51 346 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Benefit payments: 2025 $ 112 $ 24 $ 40 $ 5 $ 1 $ 16 2026 112 25 40 5 1 16 2027 113 26 41 5 1 15 2028 114 26 41 5 1 15 2029 114 27 42 5 1 14 2030 to 2034 558 133 205 22 1 61
Components of OCI related to defined benefit pension plan	The components of OCI related to the portion of the defined benefit pension plan attributable to Southern Company, Southern Power, and Southern Company Gas for the years ended December 31, 2024 and 2023 are presented in the following table: Southern Company Southern Southern Company (in millions) AOCI: Balance at December 31, 2022 $ 24 $ 11 $ (75) Net loss 62 9 29 Reclassification adjustments: Amortization of prior service costs 1 — 1 Amortization of net loss (8) — — Total reclassification adjustments (7) — 1 Total change 55 9 30 Balance at December 31, 2023 $ 79 $ 20 $ (45) Net gain (29) (9) (11) Reclassification adjustments: Amortization of prior service costs 1 — 2 Amortization of net gain 1 — — Total reclassification adjustments 2 — 2 Total change (27) (9) (9) Balance at December 31, 2024 $ 52 $ 11 $ (54) The components of OCI related to the other postretirement benefit plans for the plan years ended December 31, 2024 and 2023 are presented in the following table: Southern Company Southern Southern Company Gas (in millions) AOCI: Balance at December 31, 2022 $ (4) $ — $ (2) Net (gain) loss (12) 1 — Reclassification adjustments: Amortization of net gain (loss) 7 — (8) Total change (5) 1 (8) Balance at December 31, 2023 $ (9) $ 1 $ (10) Net gain (8) (1) (5) Reclassification adjustments: Amortization of net gain (loss) 3 — — Total change (5) (1) (5) Balance at December 31, 2024 $ (14) $ — $ (15)
Changes in the APBO and the fair value of plan assets	Changes in the APBO and the fair value of the Registrants' plan assets during the plan years ended December 31, 2024 and 2023 were as follows: 2024 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Change in benefit obligation Benefit obligation at beginning of year $ 1,386 $ 329 $ 489 $ 57 $ 9 $ 172 Service cost 15 4 4 1 — 1 Interest cost 65 16 23 3 — 8 Benefits paid (105) (25) (37) (4) (1) (12) Actuarial (gain) loss (2) 2 9 (2) 1 (13) Balance at end of year 1,359 326 488 55 9 156 Change in plan assets Fair value of plan assets at beginning of year 1,095 403 410 25 — 128 Actual return on plan assets 96 37 34 — — 18 Employer contributions 55 6 13 3 1 7 Benefits paid (105) (25) (37) (4) (1) (12) Fair value of plan assets at end of year 1,141 421 420 24 — 141 Accrued asset (liability) $ (218) $ 95 $ (68) $ (31) $ (9) $ (15) 2023 Southern Company Alabama Power Georgia Mississippi Power Southern Power Southern Company Gas (in millions) Change in benefit obligation Benefit obligation at beginning of year $ 1,441 $ 344 $ 514 $ 59 $ 9 $ 179 Service cost 15 4 4 1 — 1 Interest cost 70 17 25 3 — 9 Benefits paid (107) (24) (36) (4) (1) (18) Actuarial (gain) loss (33) (12) (18) (2) 1 1 Balance at end of year 1,386 329 489 57 9 172 Change in plan assets Fair value of plan assets at beginning of year 998 372 368 24 — 113 Actual return on plan assets 131 52 51 2 — 19 Employer contributions 73 3 27 3 1 14 Benefits paid (107) (24) (36) (4) (1) (18) Fair value of plan assets at end of year 1,095 403 410 25 — 128 Accrued asset (liability) $ (291) $ 74 $ (79) $ (32) $ (9) $ (44)
Changes in balances of regulatory assets and regulatory liabilities related to defined benefit pension plans	The changes in the balance of regulatory assets related to the portion of the defined benefit pension plan attributable to Southern Company, the traditional electric operating companies, and Southern Company Gas for the years ended December 31, 2024 and 2023 are presented in the following table: Southern Alabama Power Georgia Mississippi Power Southern Company Gas (in millions) Regulatory assets (liabilities): (*) Balance at December 31, 2022 $ 2,371 $ 679 $ 887 $ 123 $ 111 Net loss 576 153 178 31 34 Reclassification adjustments: Amortization of prior service costs (1) (1) (1) — 2 Amortization of net loss (33) (10) (13) (2) — Amortization of regulatory assets (*) — — — — (4) Total reclassification adjustments (34) (11) (14) (2) (2) Total change 542 142 164 29 32 Balance at December 31, 2023 $ 2,913 $ 821 $ 1,051 $ 152 $ 143 Net gain (199) (63) (58) (5) (7) Reclassification adjustments: Amortization of prior service costs (1) (1) (1) — 2 Amortization of net loss (55) (16) (19) (3) (1) Amortization of regulatory assets (*) — — — — (11) Total reclassification adjustments (56) (17) (20) (3) (10) Total change (255) (80) (78) (8) (17) Balance at December 31, 2024 $ 2,658 $ 741 $ 973 $ 144 $ 126 (*) Amounts for Southern Company exclude regulatory assets of $155 million and $173 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company. The changes in the balance of net regulatory assets (liabilities) related to the other postretirement benefit plans for the plan years ended December 31, 2024 and 2023 are presented in the following table: Southern Company Alabama Power Georgia Mississippi Power Southern Company Gas (in millions) Net regulatory assets (liabilities): (*) Balance at December 31, 2022 $ (136) $ (21) $ (39) $ (9) $ (58) Net gain (77) (30) (38) (1) — Reclassification adjustments: Amortization of prior service costs (1) — (1) — — Amortization of net gain 6 3 4 — — Amortization of regulatory assets (*) — — — — (10) Total reclassification adjustments 5 3 3 — (10) Total change (72) (27) (35) (1) (10) Balance at December 31, 2023 $ (208) $ (48) $ (74) $ (10) $ (68) Net (gain) loss 8 1 6 1 (12) Reclassification adjustments: Amortization of prior service costs (2) (1) (1) — — Amortization of net gain 13 3 5 — 5 Amortization of regulatory assets (*) — — — — (9) Total reclassification adjustments 11 2 4 — (4) Total change 19 3 10 1 (16) Balance at December 31, 2024 $ (189) $ (45) $ (64) $ (9) $ (84) (*) Amounts for Southern Company exclude regulatory assets of $16 million and $24 million at December 31, 2024 and 2023, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.
Amounts included in AOCI related to defined benefit pension plans	Presented below are the amounts included in AOCI at December 31, 2024 and 2023 related to the portion of the defined benefit pension plan attributable to Southern Company, Southern Power, and Southern Company Gas that had not yet been recognized in net periodic pension cost. Southern Southern Southern Company (in millions) Balance at December 31, 2024 AOCI: Prior service cost $ (1) $ — $ (1) Net (gain) loss 53 11 (53) Total AOCI $ 52 $ 11 $ (54) Balance at December 31, 2023 AOCI: Prior service cost $ (1) $ — $ (2) Net (gain) loss 80 20 (43) Total AOCI $ 79 $ 20 $ (45) Presented below are the amounts included in AOCI at December 31, 2024 and 2023 related to the other postretirement benefit plans of Southern Company, Southern Power, and Southern Company Gas that had not yet been recognized in net periodic other postretirement benefit cost. Southern Southern Southern Company (in millions) Balance at December 31, 2024 AOCI: Net (gain) loss $ (14) $ — $ (15) Balance at December 31, 2023 AOCI: Prior service cost $ 1 $ — $ — Net (gain) loss (10) 1 (10) Total AOCI $ (9) $ 1 $ (10)
Summary of investment strategies and benefit plan asset fair values	A description of the major asset classes that the pension and other postretirement benefit plans are comprised of, along with the valuation methods used for fair value measurement, is provided below: Description Valuation Methodology Domestic equity: A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches. International equity: A mix of large and small capitalization growth and value stocks with developed and emerging markets exposure, managed both actively and through fundamental indexing approaches. Domestic and international equities such as common stocks, American depositary receipts, and real estate investment trusts that trade on public exchanges are classified as Level 1 investments and are valued at the closing price in the active market. Equity funds with unpublished prices that are comprised of publicly traded securities (such as commingled/pooled funds) are also valued at the closing price in the active market but are classified as Level 2. Fixed income: A mix of domestic and international bonds. Investments in fixed income securities, including fixed income pooled funds, are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument. Trust-owned life insurance (TOLI): Investments of taxable trusts aimed at minimizing the impact of taxes on the portfolio. Investments in TOLI policies are classified as Level 2 investments and are valued based on the underlying investments held in the policy's separate accounts. The underlying assets are equity and fixed income pooled funds that are comprised of Level 1 and Level 2 securities. Real estate: Investments in equity or debt of real properties and in publicly traded real estate securities. Special situations: Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies, as well as investments in promising new strategies of a longer-term nature. Private equity: Investments in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt. Private credit: Investments focused on debt instruments, of which returns are driven by income rather than capital appreciation. Infrastructure: Investments in real assets, typically with long-term, predictable, and stable cash flows and a meaningful income component. Investments in real estate, special situations, private equity, private credit, and infrastructure are typically invested in private partnerships and/or other pooled vehicles (Investment Funds) which are generally classified as Net Asset Value as a Practical Expedient, since the Investment Funds and underlying assets are not publicly traded and/or often have liquidity restrictions. The managers of the Investment Funds value the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The total market value of each of the Investment Funds is determined by aggregating the value of the underlying assets less liabilities.
Fair values of plan assets	The fair values, and actual allocations relative to the target allocations, of the Southern Company system's pension plans at December 31, 2024 and 2023 are presented below. Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2024: (Level 1) (Level 2) (NAV) Total (in millions) Southern Company Assets: Equity: 41 % 41 % Domestic equity $ 2,095 $ 835 $ — $ 2,930 International equity 1,959 1,032 — 2,991 Fixed income: 30 31 U.S. Treasury, government, and agency bonds — 1,780 — 1,780 Mortgage- and asset-backed securities — 48 — 48 Corporate bonds — 1,715 — 1,715 Pooled funds — 792 — 792 Cash equivalents and other 255 — — 255 Real estate investments 361 — 1,563 1,924 12 13 Special situations — — 237 237 3 2 Private equity — — 1,797 1,797 9 12 Private credit — — 152 152 3 1 Infrastructure — — — — 2 — Total $ 4,670 $ 6,202 $ 3,749 $ 14,621 100 % 100 % Liabilities: Derivatives $ — $ (33) $ — $ (33) Total $ 4,670 $ 6,169 $ 3,749 $ 14,588 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2024: (Level 1) (Level 2) (NAV) Total (in millions) Alabama Power Assets: Equity: 41 % 41 % Domestic equity $ 509 $ 203 $ — $ 712 International equity 476 251 — 727 Fixed income: 30 31 U.S. Treasury, government, and agency bonds — 433 — 433 Mortgage- and asset-backed securities — 12 — 12 Corporate bonds — 417 — 417 Pooled funds — 193 — 193 Cash equivalents and other 62 — — 62 Real estate investments 88 — 380 468 12 13 Special situations — — 57 57 3 2 Private equity — — 437 437 9 12 Private credit — — 37 37 3 1 Infrastructure — — — — 2 — Total $ 1,135 $ 1,509 $ 911 $ 3,555 100 % 100 % Liabilities: Derivatives $ — $ (8) $ — $ (8) Total $ 1,135 $ 1,501 $ 911 $ 3,547 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2024: (Level 1) (Level 2) (NAV) Total (in millions) Georgia Power Assets: Equity: 41 % 41 % Domestic equity $ 652 $ 259 $ — $ 911 International equity 608 320 — 928 Fixed income: 30 31 U.S. Treasury, government, and agency bonds — 552 — 552 Mortgage- and asset-backed securities — 15 — 15 Corporate bonds — 532 — 532 Pooled funds — 246 — 246 Cash equivalents and other 79 — — 79 Real estate investments 112 — 485 597 12 13 Special situations — — 73 73 3 2 Private equity — — 558 558 9 12 Private credit — — 47 47 3 1 Infrastructure — — — — 2 — Total $ 1,451 $ 1,924 $ 1,163 $ 4,538 100 % 100 % Liabilities: Derivatives $ — $ (10) $ — $ (10) Total $ 1,451 $ 1,914 $ 1,163 $ 4,528 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2024: (Level 1) (Level 2) (NAV) Total (in millions) Mississippi Power Assets: Equity: 41 % 41 % Domestic equity $ 97 $ 38 $ — $ 135 International equity 89 47 — 136 Fixed income: 30 31 U.S. Treasury, government, and agency bonds — 81 — 81 Mortgage- and asset-backed securities — 2 — 2 Corporate bonds — 78 — 78 Pooled funds — 36 — 36 Cash equivalents and other 12 — — 12 Real estate investments 16 — 71 87 12 13 Special situations — — 11 11 3 2 Private equity — — 82 82 9 12 Private credit — — 7 7 3 1 Infrastructure — — — — 2 — Total $ 214 $ 282 $ 171 $ 667 100 % 100 % Liabilities: Derivatives $ — $ (2) $ — $ (2) Total $ 214 $ 280 $ 171 $ 665 100 % 100 % Southern Power Assets: Equity: 41 % 41 % Domestic equity $ 27 $ 11 $ — $ 38 International equity 25 13 — 38 Fixed income: 30 31 U.S. Treasury, government, and agency bonds — 23 — 23 Mortgage- and asset-backed securities — 1 — 1 Corporate bonds — 22 — 22 Pooled funds — 10 — 10 Cash equivalents and other 3 — — 3 Real estate investments 5 — 20 25 12 13 Special situations — — 3 3 3 2 Private equity — — 23 23 9 12 Private credit — — 2 2 3 1 Infrastructure — — — — 2 — Total $ 60 $ 80 $ 48 $ 188 100% 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2024: (Level 1) (Level 2) (NAV) Total (in millions) Southern Company Gas Assets: Equity: 41 % 41 % Domestic equity $ 142 $ 56 $ — $ 198 International equity 132 69 — 201 Fixed income: 30 31 U.S. Treasury, government, and agency bonds — 120 — 120 Mortgage- and asset-backed securities — 3 — 3 Corporate bonds — 115 — 115 Pooled funds — 53 — 53 Cash equivalents and other 17 — — 17 Real estate investments 24 — 105 129 12 13 Special situations — — 16 16 3 2 Private equity — — 121 121 9 12 Private credit — — 10 10 3 1 Infrastructure — — — — 2 — Total $ 315 $ 416 $ 252 $ 983 100 % 100 % Liabilities: Derivatives $ — $ (2) $ — $ (2) Total $ 315 $ 414 $ 252 $ 981 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2023: (Level 1) (Level 2) (NAV) Total (in millions) Southern Company Assets: Equity: 41 % 40 % Domestic equity $ 1,959 $ 771 $ — $ 2,730 International equity 1,947 1,052 — 2,999 Fixed income: 30 32 U.S. Treasury, government, and agency bonds — 1,973 — 1,973 Mortgage- and asset-backed securities — 44 — 44 Corporate bonds — 1,724 — 1,724 Pooled funds — 777 — 777 Cash equivalents and other 371 58 — 429 Real estate investments 369 — 1,684 2,053 12 14 Special situations — — 245 245 3 2 Private equity — — 1,761 1,761 9 12 Private Credit — — 25 25 3 — Infrastructure — — — — 2 — Total $ 4,646 $ 6,399 $ 3,715 $ 14,760 100 % 100 % Alabama Power Assets: Equity: 41 % 40 % Domestic equity $ 476 $ 187 $ — $ 663 International equity 472 255 — 727 Fixed income: 30 32 U.S. Treasury, government, and agency bonds — 479 — 479 Mortgage- and asset-backed securities — 11 — 11 Corporate bonds — 418 — 418 Pooled funds — 188 — 188 Cash equivalents and other 90 14 — 104 Real estate investments 89 — 408 497 12 14 Special situations — — 59 59 3 2 Private equity — — 427 427 9 12 Private credit — — 6 6 3 — Infrastructure — — — — 2 — Total $ 1,127 $ 1,552 $ 900 $ 3,579 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2023: (Level 1) (Level 2) (NAV) Total (in millions) Georgia Power Assets: Equity: 41 % 40 % Domestic equity $ 611 $ 241 $ — $ 852 International equity 609 329 — 938 Fixed income: 30 32 U.S. Treasury, government, and agency bonds — 617 — 617 Mortgage- and asset-backed securities — 14 — 14 Corporate bonds — 539 — 539 Pooled funds — 243 — 243 Cash equivalents and other 116 18 — 134 Real estate investments 115 — 527 642 12 14 Special situations — — 77 77 3 2 Private equity — — 551 551 9 12 Private credit — — 8 8 3 — Infrastructure — — — — 2 — Total $ 1,451 $ 2,001 $ 1,163 $ 4,615 100 % 100 % Mississippi Power Assets: Equity: 41 % 40 % Domestic equity $ 89 $ 35 $ — $ 124 International equity 89 48 — 137 Fixed income: 30 32 U.S. Treasury, government, and agency bonds — 90 — 90 Mortgage- and asset-backed securities — 2 — 2 Corporate bonds — 79 — 79 Pooled funds — 36 — 36 Cash equivalents and other 17 3 — 20 Real estate investments 17 — 77 94 12 14 Special situations — — 11 11 3 2 Private equity — — 81 81 9 12 Private credit — — 1 1 3 — Infrastructure — — — — 2 — Total $ 212 $ 293 $ 170 $ 675 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2023: (Level 1) (Level 2) (NAV) Total (in millions) Southern Power Assets: Equity: 41 % 40 % Domestic equity $ 24 $ 10 $ — $ 34 International equity 25 13 — 38 Fixed income: 30 32 U.S. Treasury, government, and agency bonds — 25 — 25 Mortgage - and asset backed securities — 1 — 1 Corporate bonds — 22 — 22 Pooled funds — 10 — 10 Cash equivalents and other 5 1 — 6 Real estate investments 5 — 21 26 12 14 Special situations — — 3 3 3 2 Private equity — — 22 22 9 12 Private credit — — — — 3 — Infrastructure — — — — 2 — Total $ 59 $ 82 $ 46 $ 187 100 % 100 % Southern Company Gas Assets: Equity: 41 % 40 % Domestic equity $ 130 $ 52 $ — $ 182 International equity 130 71 — 201 Fixed income: 30 32 U.S. Treasury, government, and agency bonds — 132 — 132 Mortgage- and asset-backed securities — 3 — 3 Corporate bonds — 116 — 116 Pooled funds — 52 — 52 Cash equivalents and other 25 4 — 29 Real estate investments 25 — 113 138 12 14 Special situations — — 16 16 3 2 Private equity — — 118 118 9 12 Private credit — — 2 2 3 — Infrastructure — — — — 2 — Total $ 310 $ 430 $ 249 $ 989 100 % 100 % The fair values, and actual allocations relative to the target allocations, of the applicable Registrants' other postretirement benefit plan assets at December 31, 2024 and 2023 are presented below. Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Total Target Allocation Actual Allocation At December 31, 2024: (Level 1) (Level 2) (NAV) (in millions) Southern Company Assets: Equity: 61 % 62 % Domestic equity $ 94 $ 98 $ — $ 192 International equity 54 83 — 137 Fixed income: 29 28 U.S. Treasury, government, and agency bonds — 54 — 54 Mortgage- and asset-backed securities — 1 — 1 Corporate bonds — 48 — 48 Pooled funds — 99 — 99 Cash equivalents and other 16 — — 16 Trust-owned life insurance — 478 — 478 Real estate investments 11 — 43 54 4 5 Special situations — — 6 6 1 1 Private equity — — 50 50 3 4 Private credit — — 4 4 1 — Infrastructure — — — — 1 — Total $ 175 $ 861 $ 103 $ 1,139 100 % 100 % Liabilities: Derivatives $ — $ (1) $ — $ (1) Total $ 175 $ 860 $ 103 $ 1,138 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Total Target Allocation Actual Allocation At December 31, 2024: (Level 1) (Level 2) (NAV) (in millions) Alabama Power Assets: Equity: 68 % 68 % Domestic equity $ 17 $ 7 $ — $ 24 International equity 16 9 — 25 Fixed income: 23 24 U.S. Treasury, government, and agency bonds — 14 — 14 Corporate bonds — 14 — 14 Pooled funds — 11 — 11 Cash equivalents and other 2 — — 2 Trust-owned life insurance — 294 — 294 Real estate investments 3 — 13 16 3 4 Special situations — — 2 2 1 1 Private equity — — 15 15 3 3 Private credit — — 1 1 1 — Infrastructure — — — — 1 — Total $ 38 $ 349 $ 31 $ 418 100 % 100 % Georgia Power Assets: Equity: 59 % 59 % Domestic equity $ 52 $ 7 $ — $ 59 International equity 16 41 — 57 Fixed income: 35 33 U.S. Treasury, government, and agency bonds — 14 — 14 Corporate bonds — 14 — 14 Pooled funds — 48 — 48 Cash equivalents and other 10 — — 10 Trust-owned life insurance — 184 — 184 Real estate investments 4 — 13 17 3 4 Special situations — — 2 2 1 1 Private equity — — 15 15 2 3 Total $ 82 $ 308 $ 30 $ 420 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Total Target Allocation Actual Allocation At December 31, 2024: (Level 1) (Level 2) (NAV) (in millions) Mississippi Power Assets: Equity: 34 % 32 % Domestic equity $ 3 $ 1 $ — $ 4 International equity 3 1 — 4 Fixed income: 43 44 U.S. Treasury, government, and agency bonds — 7 — 7 Corporate bonds — 2 — 2 Pooled funds — 1 — 1 Cash equivalents and other 1 — — 1 Real estate investments — — 2 2 10 11 Special situations — — — — 2 2 Private equity — — 2 2 7 10 Private credit — — — — 3 1 Infrastructure — — — — 1 — Total $ 7 $ 12 $ 4 $ 23 100 % 100 % Southern Company Gas Assets: Equity: 72 % 73 % Domestic equity $ 1 $ 76 $ — $ 77 International equity 1 23 — 24 Fixed income: 26 25 U.S. Treasury, government, and agency bonds — 1 — 1 Corporate bonds — 1 — 1 Pooled funds — 32 — 32 Cash equivalents and other 1 — — 1 Real estate investments — — 1 1 1 1 Private equity — — 1 1 1 1 Total $ 3 $ 133 $ 2 $ 138 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2023: (Level 1) (Level 2) (NAV) Total (in millions) Southern Company Assets: Equity: 60 % 61 % Domestic equity $ 85 $ 87 $ — $ 172 International equity 53 82 — 135 Fixed income: 30 28 U.S. Treasury, government, and agency bonds — 57 — 57 Mortgage- and asset-backed securities — 2 — 2 Corporate bonds — 47 — 47 Pooled funds — 92 — 92 Cash equivalents and other 21 2 — 23 Trust-owned life insurance — 456 — 456 Real estate investments 11 — 46 57 4 6 Special situations — — 6 6 1 1 Private equity — — 48 48 3 4 Private credit — — 1 1 1 — Infrastructure — — — — 1 — Total $ 170 $ 825 $ 101 $ 1,096 100 % 100 % Alabama Power Assets: Equity: 67 % 66 % Domestic equity $ 16 $ 6 $ — $ 22 International equity 16 9 — 25 Fixed income: 23 23 U.S. Treasury, government, and agency bonds — 16 — 16 Corporate bonds — 14 — 14 Pooled funds — 8 — 8 Cash equivalents and other 3 — — 3 Trust-owned life insurance — 280 — 280 Real estate investments 3 — 14 17 4 6 Special situations — — 2 2 1 1 Private equity — — 15 15 3 4 Private credit — — — — 1 — Infrastructure — — — — 1 — Total $ 38 $ 333 $ 31 $ 402 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2023: (Level 1) (Level 2) (NAV) Total (in millions) Georgia Power Assets: Equity: 58 % 57 % Domestic equity $ 47 $ 6 $ — $ 53 International equity 16 40 — 56 Fixed income: 35 35 U.S. Treasury, government, and agency bonds — 16 — 16 Corporate bonds — 14 — 14 Pooled funds — 47 — 47 Cash equivalents and other 13 — — 13 Trust-owned life insurance — 176 — 176 Real estate investments 4 — 14 18 3 4 Special situations — — 2 2 1 1 Private equity — — 14 14 2 3 Private credit — — — — 1 — Total $ 80 $ 299 $ 30 $ 409 100 % 100 % Mississippi Power Assets: Equity: 34 % 33 % Domestic equity $ 3 $ 1 $ — $ 4 International equity 3 1 — 4 Fixed income: 43 44 U.S. Treasury, government, and agency bonds — 7 — 7 Corporate bonds — 2 — 2 Pooled funds — 1 — 1 Cash equivalents and other 1 — — 1 Real estate investments 1 — 2 3 10 11 Special situations — — — — 2 2 Private equity — — 2 2 7 10 Private credit — — — — 3 — Infrastructure — — — — 1 — Total $ 8 $ 12 $ 4 $ 24 100 % 100 % Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Net Asset Value as a Practical Expedient Target Allocation Actual Allocation At December 31, 2023: (Level 1) (Level 2) (NAV) Total (in millions) Southern Company Gas Assets: Equity: 72 % 72 % Domestic equity $ 2 $ 67 $ — $ 69 International equity 2 22 — 24 Fixed income: 26 26 U.S. Treasury, government, and agency bonds — 1 — 1 Corporate bonds — 1 — 1 Pooled funds — 29 — 29 Cash equivalents and other 1 — — 1 Real estate investments — — 1 1 1 1 Private equity — — 1 1 1 1 Total $ 5 $ 120 $ 2 $ 127 100 % 100 %
Total matching contributions	Total matching contributions made to the plans for 2024, 2023, and 2022 were as follows: Southern Company Alabama Georgia Mississippi Southern Southern Company Gas (in millions) 2024 $ 137 $ 29 $ 31 $ 5 $ 3 $ 20 2023 131 28 31 5 3 18 2022 124 26 29 5 3 17

STOCK COMPENSATION (Tables)

STOCK COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of employees participating in stock-based compensation programs	At December 31, 2024, the number of current and former employees participating in stock-based compensation programs for the Registrants was as follows: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas Number of employees 1,154 158 161 36 36 183
Assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted	The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of TSR awards granted: Year Ended December 31 2024 2023 2022 Expected volatility 19.1% 30.0% 29.6% Interest rate 4.0% 3.8% 1.7% Weighted average grant-date fair value $80.99 $76.83 $79.69
Schedule of compensation costs and related tax benefits	Southern Company's total PSU compensation cost and the related tax benefit recognized in income for the years ended December 31, 2024, 2023, and 2022 were as follows: 2024 2023 2022 (in millions) Compensation cost recognized in income $ 102 $ 107 $ 101 Tax benefit of compensation cost recognized in income 27 28 26 Southern Company's total RSU compensation cost and the related tax benefit recognized in income for the years ended December 31, 2024, 2023, and 2022 were as follows: 2024 2023 2022 (in millions) Compensation cost recognized in income $ 30 $ 30 $ 26 Tax benefit of compensation cost recognized in income 8 8 7 Southern Company's total intrinsic value of options exercised and the related tax benefit for the years ended December 31, 2024, 2023, and 2022 were as follows: 2024 2023 2022 (in millions) Intrinsic value of options exercised $ 10 $ 18 $ 49 Tax benefit of options exercised 2 4 12

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Assets and liabilities measured at fair value on a recurring basis	The fair value increases (decreases) of the Funds, including unrealized gains (losses) and reinvested interest and dividends and excluding the Funds' expenses, for 2024, 2023, and 2022 are shown in the table below. Southern Company Alabama Georgia (in millions) Fair value increases (decreases) 2024 $ 229 $ 143 $ 86 2023 281 157 124 2022 (360) (171) (189) Unrealized gains (losses) At December 31, 2024 $ 113 $ 64 $ 49 At December 31, 2023 241 119 122 At December 31, 2022 (391) (204) (187) At December 31, 2024, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows: Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2024: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Southern Company Assets: Energy-related derivatives (a) $ 12 $ 77 $ — $ — $ 89 Investments in trusts: (b) Domestic equity 849 250 — — 1,099 Foreign equity 148 175 — — 323 U.S. Treasury and government agency securities — 371 — — 371 Municipal bonds — 47 — — 47 Pooled funds – fixed income — 7 — — 7 Corporate bonds — 452 — — 452 Mortgage and asset backed securities — 106 — — 106 Private equity — — — 181 181 Cash and cash equivalents 1 — — — 1 Other 39 3 — 9 51 Investments, available for sale: U.S. Treasury and government agency securities 2 7 — — 9 Corporate bonds 1 2 — — 3 Mortgage and asset backed securities — 10 — — 10 Cash equivalents and restricted cash 533 19 — — 552 Other investments 9 31 8 — 48 Total $ 1,594 $ 1,557 $ 8 $ 190 $ 3,349 Liabilities: Energy-related derivatives (a) $ 5 $ 124 $ — $ — $ 129 Interest rate derivatives — 269 — — 269 Foreign currency derivatives — 218 — — 218 Contingent consideration 3 — 16 — 19 Other — 13 11 — 24 Total $ 8 $ 624 $ 27 $ — $ 659 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2024: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Alabama Power Assets: Energy-related derivatives $ — $ 26 $ — $ — $ 26 Nuclear decommissioning trusts: (b) Domestic equity 459 241 — — 700 Foreign equity 148 — — — 148 U.S. Treasury and government agency securities — 16 — — 16 Municipal bonds — 1 — — 1 Corporate bonds — 287 — — 287 Mortgage and asset backed securities — 31 — — 31 Private equity — — — 181 181 Other 11 1 — 9 21 Cash equivalents and restricted cash 334 19 — — 353 Other investments — 31 — — 31 Total $ 952 $ 653 $ — $ 190 $ 1,795 Liabilities: Energy-related derivatives $ — $ 42 $ — $ — $ 42 Georgia Power Assets: Energy-related derivatives $ — $ 19 $ — $ — $ 19 Nuclear decommissioning trusts: (b) Domestic equity 390 1 — — 391 Foreign equity — 174 — — 174 U.S. Treasury and government agency securities — 355 — — 355 Municipal bonds — 46 — — 46 Corporate bonds — 165 — — 165 Mortgage and asset backed securities — 75 — — 75 Other 28 2 — — 30 Cash equivalents 35 — — — 35 Total $ 453 $ 837 $ — $ — $ 1,290 Liabilities: Energy-related derivatives $ — $ 42 $ — $ — $ 42 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2024: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Mississippi Power Assets: Energy-related derivatives $ — $ 19 $ — $ — $ 19 Liabilities: Energy-related derivatives $ — $ 34 $ — $ — $ 34 Southern Power Assets: Energy-related derivatives $ — $ 4 $ — $ — $ 4 Cash equivalents 51 — — — 51 Total $ 51 $ 4 $ — $ — $ 55 Liabilities: Foreign currency derivatives $ — $ 51 $ — $ — $ 51 Contingent consideration 3 — 16 — 19 Other — 13 11 — 24 Total $ 3 $ 64 $ 27 $ — $ 94 Southern Company Gas Assets: Energy-related derivatives (a) $ 12 $ 9 $ — $ — $ 21 Non-qualified deferred compensation trusts: Domestic equity — 8 — — 8 Foreign equity — 1 — — 1 Pooled funds - fixed income — 7 — — 7 Cash and cash equivalents 1 — — — 1 Investments, available for sale: U.S. Treasury and government agency securities 2 7 — — 9 Corporate bonds 1 2 — — 3 Mortgage and asset backed securities — 10 — — 10 Cash equivalents 22 — — — 22 Total $ 38 $ 44 $ — $ — $ 82 Liabilities: Energy-related derivatives (a) $ 5 $ 6 $ — $ — $ 11 Interest rate derivatives — 84 — — 84 Total $ 5 $ 90 $ — $ — $ 95 (a) Excludes cash collateral of $17 million. (b) Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 under "Nuclear Decommissioning" for additional information. At December 31, 2023, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows: Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2023: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Southern Company Assets: Energy-related derivatives (a) $ 6 $ 49 $ — $ — $ 55 Investments in trusts: (b) Domestic equity 764 216 — — 980 Foreign equity 145 171 — — 316 U.S. Treasury and government agency securities — 369 — — 369 Municipal bonds — 48 — — 48 Pooled funds – fixed income — 6 — — 6 Corporate bonds — 389 — — 389 Mortgage and asset backed securities — 89 — — 89 Private equity — — — 169 169 Cash and cash equivalents 3 — — — 3 Other 58 3 — 9 70 Cash equivalents and restricted cash 253 15 — — 268 Other investments 9 27 8 — 44 Total $ 1,238 $ 1,382 $ 8 $ 178 $ 2,806 Liabilities: Energy-related derivatives (a) $ 46 $ 312 $ — $ — $ 358 Interest rate derivatives — 264 — — 264 Foreign currency derivatives — 122 — — 122 Contingent consideration 3 — 16 — 19 Other — 13 — — 13 Total $ 49 $ 711 $ 16 $ — $ 776 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2023: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Alabama Power Assets: Energy-related derivatives $ — $ 15 $ — $ — $ 15 Nuclear decommissioning trusts: (b) Domestic equity 443 208 — — 651 Foreign equity 145 — — — 145 U.S. Treasury and government agency securities — 20 — — 20 Municipal bonds — 1 — — 1 Corporate bonds — 231 — — 231 Mortgage and asset backed securities — 25 — — 25 Private equity — — — 169 169 Other 8 — — 9 17 Cash equivalents and restricted cash 119 15 — — 134 Other investments — 27 — — 27 Total $ 715 $ 542 $ — $ 178 $ 1,435 Liabilities: Energy-related derivatives $ — $ 110 $ — $ — $ 110 Georgia Power Assets: Energy-related derivatives $ — $ 13 $ — $ — $ 13 Nuclear decommissioning trusts: (b) Domestic equity 321 1 — — 322 Foreign equity — 170 — — 170 U.S. Treasury and government agency securities — 349 — — 349 Municipal bonds — 47 — — 47 Corporate bonds — 158 — — 158 Mortgage and asset backed securities — 64 — — 64 Other 50 3 — — 53 Total $ 371 $ 805 $ — $ — $ 1,176 Liabilities: Energy-related derivatives $ — $ 124 $ — $ — $ 124 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient At December 31, 2023: (Level 1) (Level 2) (Level 3) (NAV) Total (in millions) Mississippi Power Assets: Energy-related derivatives $ — $ 15 $ — $ — $ 15 Cash equivalents 17 — — — 17 Total $ 17 $ 15 $ — $ — $ 32 Liabilities: Energy-related derivatives $ — $ 61 $ — $ — $ 61 Southern Power Assets: Energy-related derivatives $ — $ 3 $ — $ — $ 3 Liabilities: Energy-related derivatives $ — $ 5 $ — $ — $ 5 Foreign currency derivatives — 22 — — 22 Contingent consideration 3 — 16 — 19 Other — 13 — — 13 Total $ 3 $ 40 $ 16 $ — $ 59 Southern Company Gas Assets: Energy-related derivatives (a) $ 6 $ 3 $ — $ — $ 9 Non-qualified deferred compensation trusts: Domestic equity — 7 — — 7 Foreign equity — 1 — — 1 Pooled funds - fixed income — 6 — — 6 Cash and cash equivalents 3 — — — 3 Total $ 9 $ 17 $ — $ — $ 26 Liabilities: Energy-related derivatives (a) $ 46 $ 12 $ — $ — $ 58 Interest rate derivatives — 79 — — 79 Total $ 46 $ 91 $ — $ — $ 137 (a) Excludes cash collateral of $62 million. (b)
Financial instruments not having carrying amount equal to fair value	At December 31, 2024 and 2023, other financial instruments for which the carrying amount did not equal fair value were as follows: Southern Company (*) Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (*) (in billions) At December 31, 2024: Long-term debt, including securities due within one year: Carrying amount $ 63.2 $ 11.2 $ 18.1 $ 1.7 $ 2.7 $ 8.5 Fair value 57.7 9.8 16.2 1.5 2.6 7.4 At December 31, 2023: Long-term debt, including securities due within one year: Carrying amount $ 59.4 $ 11.2 $ 16.5 $ 1.6 $ 2.7 $ 7.8 Fair value 55.0 10.1 15.1 1.4 2.6 6.8 (*) The carrying amount of Southern Company Gas' long-term debt includes fair value adjustments from the effective date of the 2016 merger with Southern Company. Southern Company Gas amortizes the fair value adjustments over the remaining lives of the respective bonds, the latest being through 2043.

DERIVATIVES (Tables)

DERIVATIVES (Tables)	12 Months Ended
	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of energy-related derivatives	At December 31, 2024, the net volume of energy-related derivative contracts for natural gas positions, together with the longest hedge date over which the respective entity is hedging its exposure to the variability in future cash flows for forecasted transactions and the longest non-hedge date for derivatives not designated as hedges, were as follows: Net Longest Longest (in millions) Southern Company (*) 431 2030 2028 Alabama Power 123 2027 — Georgia Power 116 2027 — Mississippi Power 103 2028 — Southern Power 6 2030 2025 Southern Company Gas (*) 83 2027 2028 (*) Southern Company Gas' derivative instruments include both long and short natural gas positions. A long position is a contract to purchase natural gas and a short position is a contract to sell natural gas. Southern Company Gas' volume represents the net of long natural gas positions of 90 million mmBtu and short natural gas positions of 7 million mmBtu at December 31, 2024, which is also included in Southern Company's total volume.
Notional amount of interest rate derivatives	At December 31, 2024, the following interest rate derivatives were outstanding: Notional Weighted Average Interest Rate Paid Interest Hedge Fair Value (in millions) (in millions) Fair Value Hedges of Existing Debt Southern Company parent $ 400 1-month SOFR + 0.80% 1.75% March 2028 $ (42) Southern Company parent 1,000 1-month SOFR + 2.48% 3.70% April 2030 (143) Southern Company Gas 500 1-month SOFR + 0.49% 1.75% January 2031 (84) Southern Company $ 1,900 $ (269)
Schedule of foreign exchange contracts	At December 31, 2024, the following foreign currency derivatives were outstanding: Pay Notional Pay Rate Receive Notional Receive Rate Hedge Fair Value (in millions) (in millions) (in millions) Cash Flow Hedges of Existing Debt Southern Power $ 564 3.78% € 500 1.85% June 2026 $ (51) Fair Value Hedges of Existing Debt Southern Company parent 1,476 3.39% 1,250 1.88% September 2027 (167) Southern Company $ 2,040 € 1,750 $ (218)
Fair value of energy-related derivatives and interest rate derivatives	The fair value of energy-related derivatives, interest rate derivatives, and foreign currency derivatives was reflected as either assets or liabilities in the balance sheets (included in "Other" or shown separately as "Risk Management Activities") as follows: 2024 2023 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) Southern Company Energy-related derivatives designated as hedging instruments for regulatory purposes Current $ 33 $ 82 $ 12 $ 198 Non-current 42 40 31 117 Total derivatives designated as hedging instruments for regulatory purposes 75 122 43 315 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Current 4 3 — 29 Non-current 4 — 3 4 Interest rate derivatives: Current — 61 — 74 Non-current — 208 — 190 Foreign currency derivatives: Current — 36 — 34 Non-current — 182 — 88 Total derivatives designated as hedging instruments in cash flow and fair value hedges 8 490 3 419 Energy-related derivatives not designated as hedging instruments Current 5 3 8 8 Non-current 1 — 1 2 Total derivatives not designated as hedging instruments 6 3 9 10 Gross amounts recognized 89 615 55 744 Gross amounts offset (a) (44) (61) (23) (85) Net amounts recognized in the Balance Sheets (b) $ 45 $ 554 $ 32 $ 659 Alabama Power Energy-related derivatives designated as hedging instruments for regulatory purposes Current $ 11 $ 30 $ 6 $ 69 Non-current 15 12 9 41 Total derivatives designated as hedging instruments for regulatory purposes 26 42 15 110 Gross amounts offset (19) (19) (10) (10) Net amounts recognized in the Balance Sheets $ 7 $ 23 $ 5 $ 100 2024 2023 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) Georgia Power Energy-related derivatives designated as hedging instruments for regulatory purposes Current $ 6 $ 32 $ 2 $ 82 Non-current 13 9 10 42 Total derivatives designated as hedging instruments for regulatory purposes 19 41 12 124 Energy-related derivatives not designated as hedging instruments Current — 1 — — Non-current — — 1 — Total derivatives not designated as hedging instruments — 1 1 — Gross amounts recognized 19 42 13 124 Gross amounts offset (15) (15) (11) (11) Net amounts recognized in the Balance Sheets $ 4 $ 27 $ 2 $ 113 Mississippi Power Energy-related derivatives designated as hedging instruments for regulatory purposes Current $ 5 $ 15 $ 3 $ 27 Non-current 14 19 12 34 Total derivatives designated as hedging instruments for regulatory purposes 19 34 15 61 Gross amounts offset (17) (17) (14) (14) Net amounts recognized in the Balance Sheets $ 2 $ 17 $ 1 $ 47 Southern Power Derivatives designated as hedging instruments in cash flow hedges Energy-related derivatives: Current $ 1 $ — $ — $ 5 Non-current 3 — 3 — Foreign currency derivatives: Current — 11 — 11 Non-current — 40 — 11 Total derivatives designated as hedging instruments in cash flow hedges 4 51 3 27 Net amounts recognized in the Balance Sheets $ 4 $ 51 $ 3 $ 27 2024 2023 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) Southern Company Gas Energy-related derivatives designated as hedging instruments for regulatory purposes Current $ 11 $ 5 $ 1 $ 20 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Current 3 3 — 24 Non-current 1 — — 4 Interest rate derivatives: Current — 17 — 20 Non-current — 67 — 59 Total derivatives designated as hedging instruments in cash flow and fair value hedges 4 87 — 107 Energy-related derivatives not designated as hedging instruments Current 5 2 7 8 Non-current 1 — 1 2 Total derivatives not designated as hedging instruments 6 2 8 10 Gross amounts recognized 21 94 9 137 Gross amounts offset (a) 7 (10) 12 (50) Net amounts recognized in the Balance Sheets (b) $ 28 $ 84 $ 21 $ 87 (a) Gross amounts offset includes cash collateral held on deposit in broker margin accounts of $17 million and $62 million at December 31, 2024 and 2023, respectively. (b) Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives for all periods presented.
Pre-tax effects on the balance sheets	At December 31, 2024 and 2023, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivative instruments designated as regulatory hedging instruments and deferred were as follows: Regulatory Hedge Unrealized Gain (Loss) Recognized in the Balance Sheets Derivative Category and Balance Sheet Southern Alabama Georgia Mississippi Southern Company Gas (in millions) At December 31, 2024: Energy-related derivatives: Other regulatory assets, current $ (61) $ (23) $ (26) $ (11) $ (1) Other regulatory assets, deferred (5) — — (5) — Other regulatory liabilities, current 8 4 — — 4 Other regulatory liabilities, deferred 8 3 4 1 — Total energy-related derivative gains (losses) $ (50) $ (16) $ (22) $ (15) $ 3 At December 31, 2023: Energy-related derivatives: Other regulatory assets, current $ (180) $ (67) $ (80) $ (25) $ (8) Other regulatory assets, deferred (87) (32) (33) (22) — Other regulatory liabilities, current 9 4 — 1 4 Other regulatory liabilities, deferred 1 — 1 — — Total energy-related derivative gains (losses) $ (257) $ (95) $ (112) $ (46) $ (4)
Pre-tax effects of hedging on AOCI	For the years ended December 31, 2024, 2023, and 2022, the pre-tax effects of cash flow and fair value hedge accounting on AOCI for the applicable Registrants were as follows: Gain (Loss) From Derivatives Recognized in OCI 2024 2023 2022 (in millions) Southern Company Cash flow hedges: Energy-related derivatives $ (7) $ (81) $ 3 Interest rate derivatives 23 (12) 46 Foreign currency derivatives (40) 14 (105) Fair value hedges (*) : Foreign currency derivatives 16 21 (24) Total $ (8) $ (58) $ (80) Georgia Power Cash flow hedges: Interest rate derivatives $ 24 $ (2) $ 31 Mississippi Power Cash flow hedges: Interest rate derivatives $ 7 $ — $ — Southern Power Cash flow hedges: Energy-related derivatives $ (1) $ (18) $ (15) Foreign currency derivatives (40) 14 (105) Total $ (41) $ (4) $ (120) Southern Company Gas Cash flow hedges: Energy-related derivatives $ (6) $ (63) $ 18 Interest rate derivatives (5) — — Total $ (11) $ (63) $ 18 (*) Represents amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded in OCI.
Pre-tax effect of interest rate and energy related derivatives	The pre-tax effects of cash flow and fair value hedge accounting on income for the years ended December 31, 2024, 2023, and 2022 were as follows: Gain (Loss) Statements of Income Location Derivative Category 2024 2023 2022 (in millions) Southern Company Cost of natural gas Energy-related cash flow hedges $ (40) $ (44) $ 37 Other operations and maintenance Energy-related cash flow hedges (2) (2) — Depreciation and amortization Energy-related cash flow hedges (6) (23) (5) Interest expense, net of amounts capitalized Interest rate cash flow hedges (16) (35) (25) Foreign currency cash flow hedges (12) (11) (19) Interest rate fair value hedges (4) 37 (291) Other income (expense), net Foreign currency cash flow hedges (33) 19 (83) Foreign currency fair value hedges 2 69 (106) Amount excluded from effectiveness testing recognized in earnings (16) (21) 24 Southern Power Depreciation and amortization Energy-related cash flow hedges $ (6) $ (23) $ (5) Interest expense, net of amounts capitalized Foreign currency cash flow hedges (12) (11) (19) Other income (expense), net Foreign currency cash flow hedges (33) 19 (83) Southern Company Gas Cost of natural gas Energy-related cash flow hedges $ (40) $ (44) $ 37 Other operations and maintenance Energy-related cash flow hedges (2) (2) — Interest expense, net of amounts capitalized Interest rate cash flow hedges (1) (19) (4) Interest rate fair value hedges (5) 6 (86)
Schedule of fair value hedging instruments, statements of financial performance and financial position, location	At December 31, 2024 and 2023, the following amounts were recorded on the balance sheets related to cumulative basis adjustments for fair value hedges: Carrying Amount of Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item Balance Sheet Location of Hedged Items At December 31, 2024 At December 31, 2023 At December 31, 2024 At December 31, 2023 (in millions) (in millions) Southern Company Long-term debt $ (2,936) $ (3,024) $ 242 $ 235 Southern Company Gas Long-term debt $ (422) $ (427) $ 75 $ 70
Pre-tax effect of interest rate and energy related derivatives	The pre-tax effects of energy-related derivatives not designated as hedging instruments on the statements of income of Southern Company and Southern Company Gas for the years ended December 31, 2024, 2023, and 2022 were as follows: Gain (Loss) Derivatives in Non-Designated Hedging Relationships Statements of Income Location 2024 2023 2022 (in millions) Energy-related derivatives Natural gas revenues (*) $ — $ — $ (11) Cost of natural gas 94 59 (65) Total derivatives in non-designated hedging relationships $ 94 $ 59 $ (76) (*) Excludes the impact of weather derivatives recorded in natural gas revenues of $12 million, $15 million, and $(7) million for 2024, 2023 and 2022, respectively, as they are accounted for based on intrinsic value rather than fair value.

ACQUISITIONS AND DISPOSITIONS (

ACQUISITIONS AND DISPOSITIONS (Tables)	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of construction projects	Project Resource Approximate Nameplate Capacity ( MW ) Location Actual/Projected COD PPA Contract Period Projects Under Construction at December 31, 2024 Millers Branch Phase I Solar 200 Haskell County, TX Fourth quarter 2025 20 years Phase II Solar 180 Haskell County, TX Second quarter 2026 15 years Phase III Solar 132 Haskell County, TX Fourth quarter 2026 15 years Projects Completed During 2024 South Cheyenne Solar 150 Laramie County, WY April 2024 20 years Projects Completed During 2022 Garland Solar Storage (a) Battery energy storage 88 Kern County, CA September 2021 through February 2022 (b) 20 years Tranquillity Solar Storage (a) Battery energy storage 72 Fresno County, CA November 2021 through March 2022 (c) 20 years (a) Southern Power consolidates each project's operating results in its financial statements and the tax equity partner and two other partners each own a noncontrolling interest. See Note 9 under "Lessor" for additional information. (b) The facility has a total capacity of 88 MWs, of which 73 MWs were placed in service in 2021 and 15 MWs were placed in service in 2022. (c) The facility has a total capacity of 72 MWs, of which 32 MWs were placed in service in 2021 and 40 MWs were placed in service in 2022.

SEGMENT AND RELATED INFORMATI_2

SEGMENT AND RELATED INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Financial data for business segments	Financial data for business segments and products and services for the years ended December 31, 2024, 2023, and 2022 was as follows: Electric Utilities Traditional Southern Eliminations Total Southern Company Gas Total Reportable Segments All Eliminations Consolidated (in millions) 2024 Operating revenues $ 19,977 $ 2,014 $ (388) $ 21,603 $ 4,456 $ 26,059 $ 843 $ (178) $ 26,724 Other segment items (a)(b)(c)(d) 10,057 1,060 (388) 10,729 2,613 13,342 802 (149) 13,995 Depreciation and amortization (e) 3,512 522 — 4,034 650 4,684 71 — 4,755 Earnings from equity method investments 8 — — 8 146 154 (17) 2 139 Interest expense 1,255 117 — 1,372 341 1,713 1,030 — 2,743 Income taxes (benefit) 1,016 (13) — 1,003 258 1,261 (292) — 969 Segment net income (loss) (b)(c)(d)(e)(f) $ 4,145 $ 328 $ — $ 4,473 $ 740 $ 5,213 $ (785) $ (27) $ 4,401 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 5,017 $ 144 $ — $ 5,161 Total assets 105,577 12,653 (1,025) 117,205 26,177 143,382 2,371 (573) 145,180 2023 Operating revenues $ 18,358 $ 2,189 $ (549) $ 19,998 $ 4,702 $ 24,700 $ 718 $ (165) $ 25,253 Other segment items (a)(c)(g)(h) 9,643 1,187 (549) 10,281 3,124 13,405 699 (150) 13,954 Depreciation and amortization 3,361 504 — 3,865 582 4,447 78 — 4,525 Earnings from equity method investments (1) — — (1) 140 139 5 — 144 Interest expense 1,145 129 — 1,274 310 1,584 879 (17) 2,446 Income taxes (benefit) 571 12 — 583 211 794 (298) — 496 Segment net income (loss) (c)(f)(g)(h) $ 3,637 $ 357 $ — $ 3,994 $ 615 $ 4,609 $ (635) $ 2 $ 3,976 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 5,017 $ 144 $ — $ 5,161 Total assets 100,429 12,761 (545) 112,645 25,083 137,728 2,446 (843) 139,331 2022 Operating revenues $ 20,408 $ 3,369 $ (904) $ 22,873 $ 5,962 $ 28,835 $ 593 $ (149) $ 29,279 Other segment items (a)(c)(i)(j) 12,820 2,341 (904) 14,257 4,536 18,793 771 (138) 19,426 Depreciation and amortization 2,513 516 — 3,029 559 3,588 75 — 3,663 Earnings from equity method investments — — — — 148 148 3 — 151 Interest expense 929 138 — 1,067 263 1,330 694 (2) 2,022 Income taxes (benefit) 828 20 — 848 180 1,028 (233) — 795 Segment net income (loss) (c)(f)(i)(j) $ 3,318 $ 354 $ — $ 3,672 $ 572 $ 4,244 $ (711) $ (9) $ 3,524 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 5,017 $ 144 $ — $ 5,161 Total assets 95,861 13,081 (659) 108,283 24,621 132,904 2,665 (678) 134,891 (a) Primarily consists of fuel, purchased power, cost of natural gas, cost of other sales, other operations and maintenance, taxes other than income taxes, charges (credits) to income for estimated probable losses, losses (gains) on asset dispositions, impairment charges, AFUDC equity, non-service cost-related retirement benefits income, and net income (loss) attributable to noncontrolling interests. (b) For the traditional electric operating companies, includes a pre-tax impairment loss at Alabama Power of $36 million ($27 million after tax) related to Alabama Power discontinuing the development of a multi-use commercial facility. See Note 1 under "Impairment of Long-Lived Assets" for additional information. (c) For the traditional electric operating companies, includes pre-tax charges (credits) to income at Georgia Power for the estimated probable loss associated with the construction and completion of Plant Vogtle Units 3 and 4 of $(21) million ($(16) million after tax) in 2024, $(68) million ($(50) million after tax) in 2023, and $183 million ($137 million after tax) in 2022. See Note 2 under "Georgia Power – Nuclear Construction" for additional information. (d) For the traditional electric operating companies, includes a pre-tax gain at Georgia power of approximately $114 million ($84 million after tax) related to the sale of transmission line assets under the integrated transmission system agreement. See Note 2 under "Georgia Power – Transmission Asset Sales" for additional information. (e) For Southern Power, includes pre-tax accelerated depreciation of $9 million ($7 million after tax) related to the commitment to repower 200 MWs of the Kay Wind facility. See Note 15 under "Southern Power – Development Projects" for additional information. (f) Attributable to Southern Company. (g) For Southern Power, includes an $18 million pre-tax loss recovery ($9 million after tax and partnership allocations) related to an arbitration award and a $16 million pre-tax gain ($12 million after tax) on the sale of spare parts. See Note 3 under "General Litigation Matters – Southern Power" for additional information. (h) For Southern Company Gas, includes pre-tax charges totaling approximately $96 million ($72 million after tax) associated with the disallowance of certain capital investments at Nicor Gas. See Note 2 under "Southern Company Gas" for additional information. (i) For Southern Company Gas, includes pre-tax impairment charges totaling approximately $131 million ($99 million after tax) related to the sale of natural gas storage facilities. See Note 15 under "Southern Company Gas" for additional information. (j) For the "All Other" column, includes a $119 million goodwill impairment loss (pre-tax and after tax) at PowerSecure. See Note 1 under "Goodwill and Other Intangible Assets" for additional information. Financial data for Alabama Power's and Georgia Power's significant segment expenses and other segment information for the years ended December 31, 2024, 2023, and 2022 was as follows: 2024 2023 2022 (in millions) Alabama Power Operating revenues $ 7,554 $ 7,050 $ 7,817 Utility operations and maintenance Rate RSE expenses 1,480 1,421 1,645 Rate CNP Compliance expenses 279 254 237 Total utility operations and maintenance 1,759 1,675 1,882 Other segment items (a)(b) 2,125 2,098 2,915 Depreciation and amortization 1,459 1,401 875 Interest expense 448 425 382 Income taxes 360 81 423 Segment net income (b) $ 1,403 $ 1,370 $ 1,340 Capital expenditures $ 2,114 $ 2,159 $ 2,206 Georgia Power Operating revenues $ 11,331 $ 10,118 $ 11,584 Utility operations and maintenance 2,210 1,901 2,237 Other segment items (a)(c)(d) 3,476 3,382 5,249 Depreciation and amortization 1,774 1,681 1,430 Interest expense 725 626 485 Income taxes 603 448 370 Segment net income (c)(d) $ 2,543 $ 2,080 $ 1,813 Capital expenditures $ 5,355 $ 5,394 $ 4,219 (a) Primarily consists of fuel, purchased power, expenses from unregulated products and services, losses (gains) on asset dispositions, impairment charges, amortization of cloud software, taxes other than income taxes, charges (credits) to income for estimated probable losses, AFUDC equity, and non-service cost-related retirement benefits income. Also includes earnings from equity method investments, which were immaterial for all periods presented. (b) For 2024, includes a pre-tax impairment loss of $36 million ($27 million after tax) related to Alabama Power discontinuing the development of a multi-use commercial facility. See Note 1 under "Impairment of Long-Lived Assets" for additional information. (c) Includes pre-tax charges (credits) to income for the estimated probable loss associated with the construction and completion of Plant Vogtle Units 3 and 4 of $(21) million ($(16) million after tax) in 2024, $(68) million ($(50) million after tax) in 2023, and $183 million ($137 million after tax) in 2022. See Note 2 under "Georgia Power – Nuclear Construction" for additional information. (d) For 2024, includes a pre-tax gain of approximately $114 million ($84 million after tax) related to the sale of transmission line assets under the integrated transmission system agreement. See Note 2 under "Georgia Power – Transmission Asset Sales" for additional information. Financial data for business segments for the years ended December 31, 2024, 2023, and 2022 was as follows: Gas Distribution Operations Gas Pipeline Investments Gas Marketing Services Total Reportable Segments All Other Eliminations Consolidated (in millions) 2024 Operating revenues $ 3,899 $ 32 $ 516 $ 4,447 $ 23 $ (14) $ 4,456 Other segment items (a) 2,236 6 356 2,598 29 (14) 2,613 Depreciation and amortization 630 5 14 649 1 — 650 Earnings from equity method investments — 146 — 146 — — 146 Interest expense 311 35 3 349 (8) — 341 Income taxes 172 31 41 244 14 — 258 Segment net income (loss) $ 550 $ 101 $ 102 $ 753 $ (13) $ — $ 740 Total assets $ 24,067 $ 1,573 $ 1,696 $ 27,336 $ 10,047 $ (11,206) $ 26,177 2023 Operating revenues $ 4,105 $ 32 $ 548 $ 4,685 $ 36 $ (19) $ 4,702 Other segment items (a)(b) 2,702 5 402 3,109 34 (19) 3,124 Depreciation and amortization 561 5 15 581 1 — 582 Earnings from equity method investments — 140 — 140 — — 140 Interest expense 275 32 3 310 — — 310 Income taxes 126 32 37 195 16 — 211 Segment net income (loss) (b) $ 441 $ 98 $ 91 $ 630 $ (15) $ — $ 615 Total assets $ 22,906 $ 1,534 $ 1,615 $ 26,055 $ 9,675 $ (10,647) $ 25,083 2022 Operating revenues $ 5,267 $ 32 $ 638 $ 5,937 $ 55 $ (30) $ 5,962 Other segment items (a)(c) 3,907 6 488 4,401 165 (30) 4,536 Depreciation and amortization 516 5 16 537 22 — 559 Earnings from equity method investments — 148 — 148 — — 148 Interest expense 229 27 3 259 4 — 263 Income taxes (benefit) 145 35 37 217 (37) — 180 Segment net income (loss) (c) $ 470 $ 107 $ 94 $ 671 $ (99) $ — $ 572 Total assets $ 22,040 $ 1,577 $ 1,616 $ 25,233 $ 8,943 $ (9,555) $ 24,621 (a) Primarily consists of cost of natural gas, other operations and maintenance, taxes other than income taxes, impairment charges, estimated loss on regulatory disallowance, AFUDC equity, and non-service cost-related retirement benefits income. (b) For gas distribution operations, includes pre-tax charges totaling approximately $96 million ($72 million after tax) associated with the disallowance of certain capital investments at Nicor Gas. See Note 2 under "Southern Company Gas" for additional information. (c) For the "All Other" column, includes pre-tax impairment charges totaling approximately $131 million ($99 million after tax) related to the sale of natural gas storage facilities. See Note 15 under "Southern Company Gas" for additional information.
Disaggregation of revenue	The following table disaggregates revenue from contracts with customers for the periods presented: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) 2024 Operating revenues Retail electric revenues Residential $ 8,276 $ 3,133 $ 4,835 $ 308 $ — $ — Commercial 6,585 2,042 4,219 324 — — Industrial 3,892 1,742 1,808 342 — — Other 124 13 102 9 — — Total retail electric revenues 18,877 6,930 10,964 983 — — Natural gas distribution revenues Residential 1,753 — — — — 1,753 Commercial 417 — — — — 417 Transportation 1,295 — — — — 1,295 Industrial 34 — — — — 34 Other 316 — — — — 316 Total natural gas distribution revenues 3,815 — — — — 3,815 Wholesale electric revenues PPA energy revenues 1,059 206 94 4 778 — PPA capacity revenues 641 108 136 63 400 — Non-PPA revenues 226 139 5 375 230 — Total wholesale electric revenues 1,926 453 235 442 1,408 — Other natural gas revenues Gas marketing services 507 — — — — 507 Other 18 — — — — 18 Total other natural gas revenues 525 — — — — 525 Other revenues 1,621 240 721 52 37 — Total revenue from contracts with customers 26,764 7,623 11,920 1,477 1,445 4,340 Other revenue sources (*) (40) (69) (589) (14) 569 116 Total operating revenues $ 26,724 $ 7,554 $ 11,331 $ 1,463 $ 2,014 $ 4,456 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) 2023 Operating revenues Retail electric revenues Residential $ 7,309 $ 2,904 $ 4,105 $ 300 $ — $ — Commercial 5,860 1,928 3,624 308 — — Industrial 3,613 1,721 1,558 334 — — Other 112 12 91 9 — — Total retail electric revenues 16,894 6,565 9,378 951 — — Natural gas distribution revenues Residential 1,981 — — — — 1,981 Commercial 505 — — — — 505 Transportation 1,184 — — — — 1,184 Industrial 45 — — — — 45 Other 324 — — — — 324 Total natural gas distribution revenues 4,039 — — — — 4,039 Wholesale electric revenues PPA energy revenues 1,107 234 87 20 790 — PPA capacity revenues 624 156 51 45 376 — Non-PPA revenues 250 65 35 407 409 — Total wholesale electric revenues 1,981 455 173 472 1,575 — Other natural gas revenues Gas marketing services 528 — — — — 528 Other 31 — — — — 31 Total other natural gas revenues 559 — — — — 559 Other revenues 1,355 213 578 39 55 — Total revenue from contracts with customers 24,828 7,233 10,129 1,462 1,630 4,598 Other revenue sources (*) 425 (183) (11) 12 559 104 Total operating revenues $ 25,253 $ 7,050 $ 10,118 $ 1,474 $ 2,189 $ 4,702 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) 2022 Operating revenues Retail electric revenues Residential $ 6,604 $ 2,638 $ 3,664 $ 302 $ — $ — Commercial 5,369 1,685 3,385 299 — — Industrial 3,764 1,507 1,921 336 — — Other 102 14 79 9 — — Total retail electric revenues 15,839 5,844 9,049 946 — — Natural gas distribution revenues Residential 2,843 — — — — 2,843 Commercial 763 — — — — 763 Transportation 1,186 — — — — 1,186 Industrial 84 — — — — 84 Other 342 — — — — 342 Total natural gas distribution revenues 5,218 — — — — 5,218 Wholesale electric revenues PPA energy revenues 2,274 489 130 16 1,673 — PPA capacity revenues 596 194 47 4 356 — Non-PPA revenues 250 200 30 690 740 — Total wholesale electric revenues 3,120 883 207 710 2,769 — Other natural gas revenues Gas marketing services 636 — — — — 636 Other 51 — — — — 51 Total other natural gas revenues 687 — — — — 687 Other revenues 1,077 194 446 47 36 — Total revenue from contracts with customers 25,941 6,921 9,702 1,703 2,805 5,905 Other revenue sources (*) 3,338 896 1,882 (9) 564 57 Total operating revenues $ 29,279 $ 7,817 $ 11,584 $ 1,694 $ 3,369 $ 5,962 (*) Other revenue sources relate to revenues from customers accounted for as derivatives and leases, alternative revenue programs at Southern Company Gas, and cost recovery mechanisms and revenues (including those related to fuel costs ) that meet other scope exceptions for revenues from contracts with customers at the traditional electric operating companies. Products and Services Electric Utilities' Revenues Year Retail Wholesale Other Total (in millions) 2024 $ 17,790 $ 2,431 $ 1,382 $ 21,603 2023 16,343 2,467 1,188 19,998 2022 18,197 3,641 1,035 22,873 Southern Company Gas' Revenues Year Gas Gas All Other Total (in millions) 2024 $ 3,899 $ 516 $ 41 $ 4,456 2023 4,090 548 64 4,702 2022 5,240 638 84 5,962

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - General (Narrative) (Details)	Dec. 31, 2024 company state
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of traditional electric operating companies | company	3
Traditional Electric Operating Companies
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of states in which entity provides utilities | state	3

SUMMARY OF SIGNIFICANT ACCOUN_5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Costs for Affiliate Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Alabama Power | Southern Company Services, Inc.
Related Party Transaction [Line Items]
Costs for services	$ 813	$ 611	$ 549
Alabama Power | Southern Natural Gas Company, LLC
Related Party Transaction [Line Items]
Costs for services	13	12	18
Georgia Power | Southern Company Services, Inc.
Related Party Transaction [Line Items]
Costs for services	1,197	857	762
Georgia Power | Southern Natural Gas Company, LLC
Related Party Transaction [Line Items]
Costs for services	103	101	99
Mississippi Power | Southern Company Services, Inc.
Related Party Transaction [Line Items]
Costs for services	130	113	115
Mississippi Power | Alabama Power | Power Pool
Related Party Transaction [Line Items]
Costs for services	8	4	4
Southern Power | Southern Company Services, Inc.
Related Party Transaction [Line Items]
Costs for services	93	86	86
Southern Power | Alabama Power | Power Pool
Related Party Transaction [Line Items]
Costs for services	17	13	29
Southern Power | Southern Natural Gas Company, LLC
Related Party Transaction [Line Items]
Costs for services	35	34	37
Southern Company Gas | Southern Company Services, Inc.
Related Party Transaction [Line Items]
Costs for services	290	261	262
Southern Company Gas | Southern Natural Gas Company, LLC
Related Party Transaction [Line Items]
Costs for services	$ 28	$ 28	$ 27

SUMMARY OF SIGNIFICANT ACCOUN_6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Affiliate Transactions (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Southern Nuclear Operating Company, Inc. | Alabama Power
Related Party Transaction [Line Items]
Costs for services	$ 260	$ 251	$ 267
Southern Nuclear Operating Company, Inc. | Georgia Power
Related Party Transaction [Line Items]
Costs for services	835	899	895
Southern Power | Georgia Power
Related Party Transaction [Line Items]
Costs for services	203	143	151
PowerSecure | Southern Company Gas | US General Services Administration
Related Party Transaction [Line Items]
Costs for services	13	29	10
Contract amount			74
Southern Company Services, Inc. | Alabama Power
Related Party Transaction [Line Items]
Costs for services	813	611	549
Southern Company Services, Inc. | Georgia Power
Related Party Transaction [Line Items]
Costs for services	1,197	857	762
Southern Company Services, Inc. | Southern Power
Related Party Transaction [Line Items]
Costs for services	93	86	86
Southern Company Services, Inc. | Southern Company Gas
Related Party Transaction [Line Items]
Costs for services	290	261	262
Southern Company Services, Inc. | Mississippi Power
Related Party Transaction [Line Items]
Costs for services	130	113	115
Non-Fuel Expense | Mississippi Power | Alabama Power
Related Party Transaction [Line Items]
Costs for services	7	5	6
Purchased Power from Affiliates | Southern Power
Related Party Transaction [Line Items]
Costs for services	149	145	154
Operating Lease PPA | Southern Power
Related Party Transaction [Line Items]
Costs for services	121	116	116
Operating Lease PPA | Mississippi Power
Related Party Transaction [Line Items]
Costs for services	60
Electric Transmission | Southern Company Services, Inc. | Southern Power
Related Party Transaction [Line Items]
Costs for services	$ 25	$ 33	$ 39

SUMMARY OF SIGNIFICANT ACCOUN_7

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 26,724	$ 25,253	$ 29,279
Southern Company Gas
Disaggregation of Revenue [Line Items]
Period for collection of revenue prior to billings	24 months
Total operating revenues	$ 4,456	4,702	5,962
Southern Company Gas | Alternative revenue programs
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 43	$ 20	$ (5)

SUMMARY OF SIGNIFICANT ACCOUN_8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Revenue (Narrative) (Details)	12 Months Ended
	Dec. 31, 2024
Mississippi Power | Wholesale Customers | Long-Term Contract | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as percent)	13.90%

SUMMARY OF SIGNIFICANT ACCOUN_9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income and Other Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Southern Power
Tax Credit Carryforward [Line Items]
Percentage reduction in tax basis of assets	50%
Southern Company Gas
Tax Credit Carryforward [Line Items]
Excise taxes collected	$ 115	$ 133	$ 162
Included In Operating Expenses | Southern Company Gas
Tax Credit Carryforward [Line Items]
Excise taxes collected	$ 112	$ 129	$ 158

SUMMARY OF SIGNIFICANT ACCOU_10

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Total AFUDC and Interest Capitalized (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Capitalized Contract Cost [Line Items]
Total AFUDC and interest capitalized	$ 339	$ 400	$ 327
Alabama Power
Capitalized Contract Cost [Line Items]
Total AFUDC and interest capitalized	76	109	90
Georgia Power
Capitalized Contract Cost [Line Items]
Total AFUDC and interest capitalized	209	251	213
Southern Power
Capitalized Contract Cost [Line Items]
Total AFUDC and interest capitalized	7	3	0
Southern Company Gas
Capitalized Contract Cost [Line Items]
Total AFUDC and interest capitalized	$ 47	$ 37	$ 24

SUMMARY OF SIGNIFICANT ACCOU_11

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Average AFUDC Composite Rates (Details)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Alabama Power
Capitalized Contract Cost [Line Items]
Composite rate	8.10%	8.10%	7.90%
Georgia Power
Capitalized Contract Cost [Line Items]
Composite rate	7.70%	7.60%	7.30%
Mississippi Power
Capitalized Contract Cost [Line Items]
Composite rate	0%	0%	5.30%
Atlanta Gas Light
Capitalized Contract Cost [Line Items]
Composite rate	7.70%	7.40%	7.60%
Chattanooga Gas
Capitalized Contract Cost [Line Items]
Composite rate	7.10%	7.10%	7.10%
Nicor Gas
Capitalized Contract Cost [Line Items]
Composite rate	5.60%	4.60%	2%

SUMMARY OF SIGNIFICANT ACCOU_12

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment and Goodwill and Other Intangible Assets and Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Dec. 31, 2022
Goodwill [Line Items]
Goodwill impairment		$ 119
Alabama Power
Goodwill [Line Items]
Impairment charges	$ 36
Impairment charges, after tax	$ 27

SUMMARY OF SIGNIFICANT ACCOU_13

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Goodwill Balances (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 5,161	$ 5,161	$ 5,161
Southern Company Gas
Goodwill [Line Items]
Goodwill	5,015	5,015
Gas distribution operations | Southern Company Gas
Goodwill [Line Items]
Goodwill	4,034	4,034
Gas marketing services | Southern Company Gas
Goodwill [Line Items]
Goodwill	$ 981	$ 981

SUMMARY OF SIGNIFICANT ACCOU_14

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 669	$ 669
Accumulated Amortization	(412)	(376)
Other Intangible Assets, Net	257	293
Intangible assets, gross	744	744
Intangible assets, net	332	368
FCC licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	75	75
Accumulated Amortization	0	0
Other Intangible Assets, Net	75	75
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	212	212
Accumulated Amortization	(182)	(172)
Other Intangible Assets, Net	30	40
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	64	64
Accumulated Amortization	(59)	(53)
Other Intangible Assets, Net	5	11
PPA fair value adjustments
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	390	390
Accumulated Amortization	(168)	(148)
Other Intangible Assets, Net	222	242
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3	3
Accumulated Amortization	(3)	(3)
Other Intangible Assets, Net	0	0
Southern Power
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	(168)	(148)
Southern Power | PPA fair value adjustments
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	390	390
Accumulated Amortization	(168)	(148)
Other Intangible Assets, Net	222	242
Southern Company Gas
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	182	182
Accumulated Amortization	(173)	(166)
Other Intangible Assets, Net	9	16
Intangible assets, net	9	16
Southern Company Gas | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		156
Accumulated Amortization	(150)	(145)
Other Intangible Assets, Net	6	11
Southern Company Gas | Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		26
Accumulated Amortization	(23)	(21)
Other Intangible Assets, Net	$ 3	$ 5

SUMMARY OF SIGNIFICANT ACCOU_15

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Amortization of Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Amortization associated with other intangible assets	$ 35	$ 38	$ 39
Estimated future amortization
2025	32
2026	27
2027	23
2028	23
2029	23
Southern Power
Finite-Lived Intangible Assets [Line Items]
Amortization associated with other intangible assets	20	20	20
Estimated future amortization
2025	20
2026	20
2027	20
2028	20
2029	19
Southern Company Gas
Estimated future amortization
2025	6
2026	3
2027	0
2028	0
2029	0
Southern Company Gas | Gas marketing services
Finite-Lived Intangible Assets [Line Items]
Amortization associated with other intangible assets	7	$ 10	$ 11
Operating Revenues
Finite-Lived Intangible Assets [Line Items]
Amortization associated with other intangible assets	$ 20

SUMMARY OF SIGNIFICANT ACCOU_16

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Transmission Receivables/Prepayments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2024
Southern Power
Disaggregation of Revenue [Line Items]
Period of reimbursement for transmission costs	5 years

SUMMARY OF SIGNIFICANT ACCOU_17

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 1,070	$ 748
Restricted cash:
Total cash, cash equivalents, and restricted cash	1,101	921	$ 2,037	$ 1,829
Other current assets
Restricted cash:
Restricted cash	31	141
Other deferred charges and assets
Restricted cash:
Restricted cash		31
Alabama Power
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	585	324
Restricted cash:
Total cash, cash equivalents, and restricted cash	585	409	687	1,060
Alabama Power | Other current assets
Restricted cash:
Restricted cash	0	85
Alabama Power | Other deferred charges and assets
Restricted cash:
Restricted cash		0
Georgia Power
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	97	9
Restricted cash:
Total cash, cash equivalents, and restricted cash	118	75	480	33
Georgia Power | Other current assets
Restricted cash:
Restricted cash	21	37
Georgia Power | Other deferred charges and assets
Restricted cash:
Restricted cash		29
Southern Power
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	159	124
Restricted cash:
Total cash, cash equivalents, and restricted cash	168	144	133	135
Southern Power | Other current assets
Restricted cash:
Restricted cash	9	17
Southern Power | Other deferred charges and assets
Restricted cash:
Restricted cash		3
Southern Power | Proceeds From Issuance Of Solid Waste Disposal Facility Revenue Bonds
Restricted cash:
Restricted cash	9	17
Southern Power | Estimated Construction Completion Costs | Deuel Harvest
Restricted cash:
Restricted cash		3
Southern Company Gas
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	43	33
Restricted cash:
Total cash, cash equivalents, and restricted cash	44	35	$ 83	$ 48
Southern Company Gas | Other current assets
Restricted cash:
Restricted cash	$ 1	2
Southern Company Gas | Other deferred charges and assets
Restricted cash:
Restricted cash		$ 0

SUMMARY OF SIGNIFICANT ACCOU_18

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Storm Damage and Reliability Reserves (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended			24 Months Ended
	Jan. 01, 2023	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2022	Apr. 11, 2024	Apr. 30, 2023	Mar. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at December 31, 2023	$ 216		$ 66	$ 216
Balance at December 31, 2024				66	$ 216	$ 216
Balance at December 31, 2024			(705)
Reliability reserve, amount deferred			84	63	191	191
Major storms
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Storm damage reserves					239
Accrual
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Accrual			79	61
Weather-related damages
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Weather-related damages			(850)	(211)
Alabama Power
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at December 31, 2023	97		76	97
Balance at December 31, 2024			70	76	97	97
Reliability reserve, amount deferred			63	52	166	166
Alabama Power | Major storms
Liability for Catastrophe Claims [Line Items]
Additional accruals authorized by state PSCs			21
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Storm damage reserves					19
Alabama Power | Accrual
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Accrual			34	18
Alabama Power | Weather-related damages
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Weather-related damages			(40)	(39)
Charges against storm damage reserves			24
Georgia Power
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at December 31, 2023	83			83
Balance at December 31, 2024					83	83
Balance at December 31, 2024			(827)	(54)
Storm damage reserves	31					213
Georgia Power | Major storms
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Weather-related damages		$ (870)
Balance at December 31, 2024			750
Storm damage reserves					213
Georgia Power | Accrual
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Accrual			31	31
Georgia Power | Weather-related damages
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Weather-related damages			(804)	(168)
Charges against storm damage reserves			82
Mississippi Power
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at December 31, 2023	$ 36		44	36
Balance at December 31, 2024			52	44	36	36
Reliability reserve, amount deferred			21	11	25	$ 25	$ 12.6	$ 11.7	$ 8.3
Mississippi Power | Major storms
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Storm damage reserves			12.6	11.7	$ 6.9
Mississippi Power | Accrual
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Accrual			14	12
Mississippi Power | Weather-related damages
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Weather-related damages			(6)	$ (4)
Charges against storm damage reserves			$ 0

SUMMARY OF SIGNIFICANT ACCOU_19

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Natural Gas for Sale (Narrative) (Details) - Nicor Gas $ in Millions	Dec. 31, 2024 USD ($)
Inventory [Line Items]
LIFO inventory balance	$ 188
Estimated replacement cost of inventory	$ 326

SUMMARY OF SIGNIFICANT ACCOU_20

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Narrative) (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Uncollectible accounts, average percent of revenues (less than)	1%	1%	1%

SUMMARY OF SIGNIFICANT ACCOU_21

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Narrative) (Details) - Atlanta Gas Light	Dec. 31, 2024 customer
Concentration Risk [Line Items]
Number of customers in Georgia	14
Percent of highest month's estimated bill	200%

SUMMARY OF SIGNIFICANT ACCOU_22

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of AOCI (Loss) Balances, Net of Tax Effects (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 35,225	$ 34,532	$ 32,276
Total other comprehensive income	99	(10)	71
Ending balance	36,674	35,225	34,532
Other	19	(5)	(6)
Qualifying Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(121)	(149)	(162)
Total other comprehensive income	75	28	13
Ending balance	(46)	(121)	(149)
Pension and Other Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(56)	(18)	(76)
Total other comprehensive income	24	(38)	58
Ending balance	(32)	(56)	(18)
Accumulated Other Comprehensive Income (Loss)(*)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(177)	(167)	(237)
Total other comprehensive income	99	(10)	71
Ending balance	(78)	(177)	(167)
Other	0		(1)
Southern Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	6,698	6,916	6,598
Total other comprehensive income	15	1	10
Ending balance	6,682	6,698	6,916
Other		(1)	(1)
Southern Power | Qualifying Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1)	(9)	1
Total other comprehensive income	8	8	(10)
Ending balance	7	(1)	(9)
Southern Power | Pension and Other Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(16)	(9)	(29)
Total other comprehensive income	7	(7)	20
Ending balance	(9)	(16)	(9)
Southern Power | Accumulated Other Comprehensive Income (Loss)(*)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(17)	(18)	(27)
Total other comprehensive income	15	1	10
Ending balance	(2)	(17)	(18)
Other			(1)
Southern Company Gas
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total other comprehensive income	32	(15)	7
Other	(1)
Southern Company Gas | Qualifying Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(24)	(25)	(14)
Total other comprehensive income	21	1	(11)
Ending balance	(3)	(24)	(25)
Southern Company Gas | Pension and Other Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	40	56	38
Total other comprehensive income	11	(16)	18
Ending balance	51	40	56
Southern Company Gas | Accumulated Other Comprehensive Income (Loss)(*)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	16	31	24
Total other comprehensive income	32	(15)	7
Ending balance	$ 48	$ 16	$ 31

REGULATORY MATTERS - Schedule o

REGULATORY MATTERS - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2023
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 7,041	$ 6,523
Regulatory asset amortization period	4 years
Regulatory asset		66	$ 216
Regulatory liabilities	$ 705
Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	2,356	2,720
Regulatory asset	70	76	97
Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	6,139	5,090
Regulatory asset			83
Costs recovered annually	5	5	12
Regulatory liabilities	$ 827	54
Georgia Power | Plant Vogtle Units 3 and 4
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	10 years
Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 59	90
Regulatory asset	52	44	$ 36
Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ (2,252)	(2,225)
Fuel Hedging (Realized And Unrealized) losses | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liability amortization period	3 years 6 months
Fuel Hedging (Realized And Unrealized) losses | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liability amortization period	3 years
Fuel Hedging (Realized And Unrealized) losses | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liability amortization period	4 years
Deferred Income Tax Credits
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ (4,536)	(4,686)
Deferred Income Tax Credits | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(1,398)	(1,506)
Deferred Income Tax Credits | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(2,149)	(2,161)
Deferred Income Tax Credits | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(219)	(241)
Deferred Income Tax Credits | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(755)	(759)
Other Cost of Removal Obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(1,176)	(287)
Other Cost of Removal Obligations | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	24	(3)
Other Cost of Removal Obligations | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	816	(46)
Other Cost of Removal Obligations | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(170)	0
Other Cost of Removal Obligations | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(1,846)	(238)
Over Recovered Regulatory Clause Revenues
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(285)	(1,312)
Over Recovered Regulatory Clause Revenues | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(29)	28
Over Recovered Regulatory Clause Revenues | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(52)	617
Over Recovered Regulatory Clause Revenues | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	(186)
Over Recovered Regulatory Clause Revenues | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ (204)	(1,771)
Regulatory liability amortization period	5 years
Reliability reserves
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ (188)	(179)
Reliability reserves | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(131)	(143)
Reliability reserves | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Reliability reserves | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(57)	(36)
Reliability reserves | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Storm/Property Damage Reserves
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(122)	(120)
Storm/Property Damage Reserves | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(70)	(76)
Storm/Property Damage Reserves | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Storm/Property Damage Reserves | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(52)	(44)
Storm/Property Damage Reserves | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Nuclear Fuel Disposal Cost Recovery
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(100)
Nuclear Fuel Disposal Cost Recovery | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(100)
Nuclear Fuel Disposal Cost Recovery | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0
Nuclear Fuel Disposal Cost Recovery | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0
Nuclear Fuel Disposal Cost Recovery | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0
Other Regulatory Liabilities
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	(180)	(333)
Other Regulatory Liabilities | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ (28)	(94)
Regulatory liability amortization period	1 year
Other Regulatory Liabilities | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ (14)	(23)
Regulatory liability amortization period	3 years
Other Regulatory Liabilities | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ (6)	(2)
Regulatory liability amortization period	1 year
Other Regulatory Liabilities | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ (31)	(101)
Regulatory liability amortization period	20 years
Deferred Income Tax Charges | Georgia Power | Plant Vogtle Units 3 and 4
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liabilities	$ 102
Deferred Income Tax Charges | Southern Company Gas | Plant Vogtle Units 3 and 4
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liabilities	24
AROs
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	5,810	5,733
AROs | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 1,906	1,936
AROs | Alabama Power | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	64 years
AROs | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 3,658	3,505
AROs | Georgia Power | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	54 years
AROs | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 248	247
AROs | Mississippi Power | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	67 years
AROs | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 0	0
AROs | Southern Company Gas | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	85 years
Retiree Benefit Plans
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 2,605	3,011
Retiree Benefit Plans | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 680	815
Retiree Benefit Plans | Alabama Power | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	14 years
Retiree Benefit Plans | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 892	976
Retiree Benefit Plans | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 134	140
Retiree Benefit Plans | Mississippi Power | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	14 years
Retiree Benefit Plans | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 44	146
Remaining Net Book Value of Retired Assets
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	1,198	1,357
Remaining Net Book Value of Retired Assets | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	454	499
Remaining Net Book Value of Retired Assets | Alabama Power | Plant Gorgas Units 8, 9, And 10
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	419
Remaining Net Book Value of Retired Assets | Alabama Power | Plant Barry Unit 4
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 35
Regulatory asset amortization period	10 years
Remaining Net Book Value of Retired Assets | Alabama Power | Maximum | Plant Gorgas Units 8, 9, And 10
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	13 years
Remaining Net Book Value of Retired Assets | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 729	841
Remaining Net Book Value of Retired Assets | Georgia Power | Plant Wansley Units 1 and 2
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	418
Remaining Net Book Value of Retired Assets | Georgia Power | Plant Hammond Units 1 - 4 and Plant Branch Units 2 - 4
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 302
Remaining Net Book Value of Retired Assets | Georgia Power | Maximum | Plant Hammond Units 1 - 4 and Plant Branch Units 2 - 4
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	11 years
Remaining Net Book Value of Retired Assets | Georgia Power | Minimum | Plant Hammond Units 1 - 4 and Plant Branch Units 2 - 4
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	1 year
Remaining Net Book Value of Retired Assets | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 15	17
Remaining Net Book Value of Retired Assets | Mississippi Power | Plant Watson and Plant Greene County | Retail electric revenues
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	10 years
Remaining Net Book Value of Retired Assets | Mississippi Power | Plant Watson and Plant Greene County | Wholesale electric revenues
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	10 years
Remaining Net Book Value of Retired Assets | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 0	0
Deferred Income Tax Charges
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	927	897
Deferred Income Tax Charges | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	264	262
Deferred Income Tax Charges | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	634	605
Deferred Income Tax Charges | Georgia Power | Plant Vogtle Units 3 and 4
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 29
Regulatory asset amortization period	10 years
Regulatory asset	$ 135
Deferred Income Tax Charges | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	27	28
Deferred Income Tax Charges | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Under Recovered Regulatory Clause Revenues
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	167	413
Under Recovered Regulatory Clause Revenues | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 119	381
Under Recovered Regulatory Clause Revenues | Alabama Power | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	6 years
Under Recovered Regulatory Clause Revenues | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 0	0
Regulatory asset amortization period	2 years
Under Recovered Regulatory Clause Revenues | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 17	12
Under Recovered Regulatory Clause Revenues | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	31	20
Fuel Hedging (Realized And Unrealized) losses
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	69	270
Fuel Hedging (Realized And Unrealized) losses | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	23	100
Regulatory asset amortization period				5 years
Fuel Hedging (Realized And Unrealized) losses | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	29	121
Fuel Hedging (Realized And Unrealized) losses | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	17	49
Fuel Hedging (Realized And Unrealized) losses | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Regulatory asset amortization period				2 years
Deferred Depreciation
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	535	270
Deferred Depreciation | Plant Scherer Units 1 through 3
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 139
Regulatory asset amortization period	6 years
Deferred Depreciation | Plant Bowen Units 1 and 2
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 80
Deferred Depreciation | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	286	143
Deferred Depreciation | Alabama Power | Plant Barry Unit 5
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	114
Deferred Depreciation | Alabama Power | Plant Barry
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	48
Deferred Depreciation | Alabama Power | Plant Gaston Unit 5
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	124
Deferred Depreciation | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	249	127
Deferred Depreciation | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Deferred Depreciation | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Environmental Remediation
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	249	255
Environmental Remediation | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Environmental Remediation | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	16	20
Environmental Remediation | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Environmental Remediation | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	233	235
Loss on Reacquired Debt
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	219	238
Loss on Reacquired Debt | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 32	35
Loss on Reacquired Debt | Alabama Power | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	23 years
Loss on Reacquired Debt | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 183	197
Loss on Reacquired Debt | Georgia Power | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	28 years
Loss on Reacquired Debt | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 4	5
Loss on Reacquired Debt | Mississippi Power | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	17 years
Loss on Reacquired Debt | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 0	1
Loss on Reacquired Debt | Southern Company Gas | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	3 years
Vacation Pay
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 224	217
Regulatory asset amortization period	1 year
Vacation Pay | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 85	83
Vacation Pay | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	112	107
Vacation Pay | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	12	11
Vacation Pay | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	15	16
Software and Cloud Computing Costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 200	150
Regulatory asset amortization period	5 years
Software and Cloud Computing Costs | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 76	59
Regulatory asset amortization period	10 years
Software and Cloud Computing Costs | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 116	84
Software and Cloud Computing Costs | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	4	2
Software and Cloud Computing Costs | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 4	5
Regulatory asset amortization period	10 years
Regulatory Clauses
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 162	140
Regulatory Clauses | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	82	112
Regulatory Clauses | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Regulatory Clauses | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Regulatory Clauses | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	80	28
Storm Damage
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	859	92
Storm Damage | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Storm Damage | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	827	54
Storm Damage | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	32	38
Storm Damage | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Nuclear Outage
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	92	83
Nuclear Outage | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 39	50
Nuclear Outage | Alabama Power | Plant Farley
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	18 months
Nuclear Outage | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 53	33
Nuclear Outage | Georgia Power | Maximum | Plant Hatch (nuclear) Units 1 and 2
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	24 months
Nuclear Outage | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 0	0
Nuclear Outage | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Long Term Debt Fair Value Adjustment
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	52	60
Long Term Debt Fair Value Adjustment | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Long Term Debt Fair Value Adjustment | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Long Term Debt Fair Value Adjustment | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Long Term Debt Fair Value Adjustment | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 52	60
Long Term Debt Fair Value Adjustment | Southern Company Gas | Maximum
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	14 years
Qualifying Repairs Of Natural Gas Distribution Systems
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 53	40
Qualifying Repairs Of Natural Gas Distribution Systems | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Qualifying Repairs Of Natural Gas Distribution Systems | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Qualifying Repairs Of Natural Gas Distribution Systems | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Qualifying Repairs Of Natural Gas Distribution Systems | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 53	40
Qualifying Repairs Of Natural Gas Distribution Systems | Atlanta Gas Light
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	20 years
Plant Daniel Units 3 and 4
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 23	25
Plant Daniel Units 3 and 4 | Retail electric revenues
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	16
Plant Daniel Units 3 and 4 | Wholesale electric revenues
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	8
Plant Daniel Units 3 and 4 | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Plant Daniel Units 3 and 4 | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Plant Daniel Units 3 and 4 | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	23	25
Plant Daniel Units 3 and 4 | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	0	0
Other Regulatory Assets
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	184	189
Other Regulatory Assets | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 42	39
Regulatory asset amortization period	19 years
Other Regulatory Assets | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 40	33
Regulatory asset amortization period	10 years
Other Regulatory Assets | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 30	25
Regulatory asset amortization period	10 years
Other Regulatory Assets | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 72	$ 93
Regulatory asset amortization period	15 years
CCR AROs | Alabama Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	38 years
CCR AROs | Georgia Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset amortization period	3 years			4 years
Regulatory Clauses, Amortized Through PEP | Mississippi Power
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 17

REGULATORY MATTERS - APC Certif

REGULATORY MATTERS - APC Certificate of Convenience and Necessity and RGC (Details) - Alabama Power $ in Millions	Oct. 24, 2024 USD ($) MW	Jun. 30, 2023 MW	Jun. 14, 2023 MW	Jun. 13, 2023 MW	Apr. 04, 2023 MW
Schedule of Regulatory Assets and Liabilities [Line Items]
Renewable generation certificate, authorized generating capacity (in MWs)		500
Additional renewable capacity (in MWs)			2,400
Size of allowable projects (in MWs)			200	80
Approval limit (in MWs)			400	160
Renewable generation certificate, generating capacity (in MWs)					498
Tenaska Alabama Partners, L.P.
Schedule of Regulatory Assets and Liabilities [Line Items]
Consideration transferred | $	$ 622
Approximate nameplate capacity (in MWs)	855

REGULATORY MATTERS - APC Rate R

REGULATORY MATTERS - APC Rate RSE (Details) - Alabama Power - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Nov. 27, 2024	Oct. 03, 2023
Public Utilities, General Disclosures [Line Items]
Rate adjustment period		2 years
Maximum percentage of rate RSE		4%
Maximum annual percentage of ratio rate		5%
Adjusting point of weighted cost of equity		5.98%
Percent of basis points		0.07%
Authorized ROE		53.90%	52.30%
Customer refundable fees, refund payments, tranche one, percentage		25%
Customer refundable fees, refund payments, tranche two, percentage		40%
Customer refundable fees, refund payments, tranche two, percentage		75%
Customer refundable fees, refund payments, tranche one, review year with rate RSE upward adjustment, percentage		50%
Rate RSE refund liability		$ 12	$ 15	$ 62
Rate RSE increase					4.87%
Rate RSE increase amount					$ 325
Customer refund			304
Deferred income taxes		$ 67	$ 81			$ 24
Minimum
Public Utilities, General Disclosures [Line Items]
Public utilities, actual weighted common equity return, threshold, percentage		6.15%
Public utilities, actual weighted common equity return, threshold for customer refundable fees, refund payments, percentage, tranche one		6.15%	6.15%	6.15%
Public utilities, actual weighted common equity return, threshold for customer refundable fees, refund payments, percentage, tranche two		6.65%
Public utilities, actual weighted common equity return, threshold for customer refundable fees, refund payments, percentage, tranche three		7.15%
Public utilities, actual weighted common equity return, threshold, review year with rate RSE upward adjustment, percentage		6.15%
Public utilities, actual weighted common equity return, threshold for customer refundable fees, refund payments, review year with rate RSE upward adjustment, percentage, tranche one		6.15%
Maximum
Public Utilities, General Disclosures [Line Items]
Public utilities, actual weighted common equity return, threshold, percentage		7.65%
Public utilities, actual weighted common equity return, threshold for customer refundable fees, refund payments, percentage, tranche one		6.65%
Public utilities, actual weighted common equity return, threshold for customer refundable fees, refund payments, percentage, tranche two		7.15%
Public utilities, actual weighted common equity return, threshold for customer refundable fees, refund payments, percentage, tranche three		7.65%
Customer refundable fees, refund payments, percentage		7.65%
Public utilities, actual weighted common equity return, threshold for customer refundable fees, refund payments, review year with rate RSE upward adjustment, percentage, tranche one		6.90%
Customer refundable fees, refund payments, review year with rate RSE upward adjustment, percentage		6.90%
Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Authorized ROE	55%
Deferred income taxes	$ 14

REGULATORY MATTERS - APC Rate C

REGULATORY MATTERS - APC Rate CNP New Plant (Details) - Alabama Power $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($)	Dec. 31, 2020 MW	Dec. 01, 2023 USD ($)	Oct. 03, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Increase to annual revenue requirement			$ 91	$ 34
Increase to annual revenue requirement, percentage			1.40%	0.60%
Requested rate increase (decrease), amount	$ 78
Requested rate increase (decrease), percentage	1.10%
Plant Barry Unit 8
Public Utilities, General Disclosures [Line Items]
Approximate Nameplate Capacity (MW) | MW		720

REGULATORY MATTERS - APC Rate_2

REGULATORY MATTERS - APC Rate CNP (Details) - Alabama Power - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Regulatory Assets and Liabilities [Line Items]
Under recovered certified power purchase agreements		$ 84	$ 103
Retail revenue requirement for environmental compliance		50	$ 23	$ 255
Retail revenue requirement for environmental compliance, as a percentage			(0.30%)	3.70%
Over (under) recovered environmental clause		(35)	$ (33)
Public utilities, approved rate increase (decrease), amount	$ 318
Approved rate increase, percent	4.60%
Other regulatory assets, current
Schedule of Regulatory Assets and Liabilities [Line Items]
Under recovered certified power purchase agreements		17	18
Over (under) recovered environmental clause			(8)
Other regulatory assets, deferred
Schedule of Regulatory Assets and Liabilities [Line Items]
Under recovered certified power purchase agreements		$ 67	85
Over (under) recovered environmental clause			$ (25)

REGULATORY MATTERS - APC Rate E

REGULATORY MATTERS - APC Rate ECR (Details) - Alabama Power $ in Millions		1 Months Ended							12 Months Ended
	May 08, 2024 USD ($) $ / KWH_Kilowatt_hour	Jan. 31, 2026 $ / KWH_Kilowatt_hour	Jan. 31, 2025 USD ($) $ / KWH_Kilowatt_hour	Dec. 31, 2023 USD ($) $ / KWH_Kilowatt_hour	Dec. 31, 2022 USD ($) $ / KWH_Kilowatt_hour	Nov. 30, 2022 $ / KWH_Kilowatt_hour	Aug. 31, 2022 USD ($) $ / KWH_Kilowatt_hour	Jul. 31, 2022 $ / KWH_Kilowatt_hour	Dec. 31, 2024 USD ($) $ / KWH_Kilowatt_hour
Schedule of Regulatory Assets and Liabilities [Line Items]
Current billing rates under rate ECR (usd per KWH) | $ / KWH_Kilowatt_hour	0.03015			0.03270	3.510	2.557	2.557	1.960	0.05910
Current billing rates under rate ECR, amount	$ 135			$ 126	$ 500		$ 310
Over (under) recovered fuel cost				$ (246)					$ (29)
Scenario, Forecast
Schedule of Regulatory Assets and Liabilities [Line Items]
Current billing rates under rate ECR (usd per KWH) | $ / KWH_Kilowatt_hour		0.05910	0.02600
Current billing rates under rate ECR, amount			$ 218

REGULATORY MATTERS - APC Accoun

REGULATORY MATTERS - APC Accounting Orders and Plant Greene County (Details) $ in Millions	Dec. 31, 2024 USD ($) MW	Dec. 31, 2023 USD ($)	Dec. 31, 2021 MW	Dec. 31, 2020 MW
Public Utilities, General Disclosures [Line Items]
Other deferred charges and assets | $	$ 19,599	$ 19,069
Alabama Power
Public Utilities, General Disclosures [Line Items]
Other deferred charges and assets | $	$ 5,175	5,090
Percent ownership	14%
Alabama Power | Plant Greene County Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Percent ownership	60%
Required fossil-stream generation retirements (in MWs) | MW	300
Mississippi Power
Public Utilities, General Disclosures [Line Items]
Other deferred charges and assets | $	$ 841	$ 887
Required fossil-stream generation retirements (in MWs) | MW				950
Mississippi Power | Plant Greene County Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Percent ownership	40%
Required fossil-stream generation retirements (in MWs) | MW			206

REGULATORY MATTERS - APC Rate N

REGULATORY MATTERS - APC Rate NDR and Reliability Reserve Accounting Order (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jul. 12, 2022
Public Utilities, General Disclosures [Line Items]
Reclassified amount	$ (97,017,000,000)	$ (90,703,000,000)	$ (97,017,000,000)	$ (90,703,000,000)
Other regulatory assets	804,000,000	1,120,000,000	804,000,000	1,120,000,000
Reliability reserve, amount deferred	84,000,000	63,000,000	84,000,000	63,000,000	$ 191,000,000
Revision of Prior Period, Reclassification, Adjustment
Public Utilities, General Disclosures [Line Items]
Reclassified amount					600,000,000
Other utility plant, net					600,000,000
Alabama Power
Public Utilities, General Disclosures [Line Items]
Minimum natural disaster reserve balance, triggering establishment charge	50,000,000		50,000,000
Natural disaster reserve authorized limit	75,000,000		75,000,000		35,000,000
Maximum rate NDR charge per month, monthly residential customer account	2.50		2.50			$ 5
Maximum rate NDR charge per month, monthly nonresidential customer account	5		5			$ 10
Annual recovery amount			12,000,000	12,000,000	14,000,000
NDR, expected recovery amount			12,000,000
Regulatory asset, amortization period	70,000,000	76,000,000	70,000,000	76,000,000
Reclassified amount	(24,760,000,000)	(24,298,000,000)	(24,760,000,000)	(24,298,000,000)
Other regulatory assets	332,000,000	385,000,000	332,000,000	385,000,000
Reliability reserve, amount deferred	63,000,000	52,000,000	$ 63,000,000	$ 52,000,000	$ 166,000,000
Alabama Power | Reliability reserves
Public Utilities, General Disclosures [Line Items]
Accrual	$ 12,000,000	$ 23,000,000
Alabama Power | Maximum
Public Utilities, General Disclosures [Line Items]
Maximum period for recovery deferred stock related operations and maintenance costs and any future reserve deficits			48 months
Alabama Power | Minimum
Public Utilities, General Disclosures [Line Items]
Maximum period for recovery deferred stock related operations and maintenance costs and any future reserve deficits			24 months

REGULATORY MATTERS - GPC Tariff

REGULATORY MATTERS - GPC Tariffs (Details) - Georgia Power $ in Millions	Dec. 31, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	$ 216
Requested rate increase (decrease), amount, due in 2024	191
Requested rate increase (decrease), amount, due in 2025	306
Traditional Base
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	194
Requested rate increase (decrease), amount, due in 2024	275
Requested rate increase (decrease), amount, due in 2025	194
ECCR
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	(21)
Requested rate increase (decrease), amount, due in 2024	(99)
Requested rate increase (decrease), amount, due in 2025	126
DSM
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	37
Requested rate increase (decrease), amount, due in 2024	10
Requested rate increase (decrease), amount, due in 2025	(22)
MFF
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	6
Requested rate increase (decrease), amount, due in 2024	5
Requested rate increase (decrease), amount, due in 2025	9
Traditional Base, Georgia State
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	$ 122

REGULATORY MATTERS - GPC Rate P

REGULATORY MATTERS - GPC Rate Plans and Integrated Resource Plan (Details) $ in Millions

1 Months Ended

3 Months Ended

12 Months Ended

56 Months Ended

60 Months Ended

Dec. 31, 2024 USD ($) agreement

Dec. 03, 2024 MW

Jun. 27, 2024 agreement

Jan. 12, 2024 MW

Oct. 27, 2023 MW

Jan. 31, 2025 MW

Jun. 30, 2023 USD ($)

May 31, 2023 USD ($)

Sep. 30, 2024 facility MW

Jun. 30, 2024 USD ($)

Dec. 31, 2028 MW

Dec. 31, 2025 USD ($) MW

Dec. 31, 2024 USD ($) MW

Dec. 31, 2023 USD ($) turbine MW

Dec. 31, 2022 USD ($) agreement MW

Dec. 31, 2019

Dec. 31, 2028 MW

Dec. 31, 2028 MW

Mar. 31, 2023 USD ($)

Public Utilities, General Disclosures [Line Items]

Regulatory asset amortization period

4 years

4 years

Georgia Power

Public Utilities, General Disclosures [Line Items]

Requested number of power purchase agreements to be certified | agreement

6

Requested additional generating capacity (in MW)

265

1,567

8,500

Requested number of affiliate power purchase agreements to be certified | agreement

2

5

Requested rate increase (decrease), amount | $

$ 1,100

$ 14,000

Requested recovery of construction costs | $

$ 10

$ 760

Public Utilities, Number Of Battery Energy Storage Facilities | facility

4

Total certified amount | $

$ 2,800

$ 2,800

Georgia Power | SEGCO

Public Utilities, General Disclosures [Line Items]

Ownership percentage, equity method investment

50%

50%

Georgia Power | Plant Scherer (coal) Unit 3

Public Utilities, General Disclosures [Line Items]

Percent Ownership

75%

75%

Georgia Power | Plant Scherer (coal) Units 1 and 2

Public Utilities, General Disclosures [Line Items]

Percent Ownership

8.40%

8.40%

Georgia Power | Plant Hatch Units 1 And 2

Public Utilities, General Disclosures [Line Items]

Percent Ownership

50.10%

50.10%

Georgia Power | Plant Vogtle (nuclear) Units 1 and 2

Public Utilities, General Disclosures [Line Items]

Percent Ownership

45.70%

45.70%

Georgia Power | ECCR

Public Utilities, General Disclosures [Line Items]

Regulatory asset amortization period

4 years

4 years

Approved rate decrease | $

$ 60

$ 20

Compliance costs expected to be incurred | $

$ 265

$ 300

Georgia Power | 2022 Alternate Rate Plan

Public Utilities, General Disclosures [Line Items]

Retail rate of return on common equity

10.50%

10.50%

Equity rate of return on common equity

56%

56%

Portion of actual earnings above approved ROE band refunded to customers

40%

Portion of actual earnings above approved ROE band applied to reduce regulatory assets

40%

Portion of actual earnings above approved ROE band retained by subsidiary company

20%

Georgia Power | 2019 Alternate Rate Plan

Public Utilities, General Disclosures [Line Items]

Retail rate of return on common equity

10.50%

Portion of actual earnings above approved ROE band refunded to customers

40%

Portion of actual earnings above approved ROE band applied to reduce regulatory assets

40%

Portion of actual earnings above approved ROE band retained by subsidiary company

20%

Customer refund liability in absence of base rate case | $

$ 117

Georgia Power | Scenario, Forecast

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

228

380

230

750

Georgia Power | Scenario, Forecast | ECCR

Public Utilities, General Disclosures [Line Items]

Approved rate increase | $

$ 123

Compliance costs expected to be incurred | $

$ 330

Georgia Power | Subsequent Event

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

1,100

Georgia Power | Subsequent Event | SEGCO

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

500

Georgia Power | Subsequent Event | Plant Scherer (coal) Unit 3

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

614

Georgia Power | Subsequent Event | Plant Scherer Unit 3

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

187

Georgia Power | Subsequent Event | Plant Bowen Units 1 Through 4

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

3,160

Georgia Power | Subsequent Event | Plant Scherer (coal) Units 1 and 2

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

137

Georgia Power | Subsequent Event | Plant McIntosh Units 10 And 11

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

1,319

Addition to nameplate capacity

194

Georgia Power | Subsequent Event | Plant McIntosh Units 1 Through 8

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

640

Addition to nameplate capacity

74

Georgia Power | Subsequent Event | Plant Hatch Units 1 And 2

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

900

Georgia Power | Subsequent Event | Plant Vogtle (nuclear) Units 1 and 2

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

1,060

Addition to nameplate capacity

112

Georgia Power | Subsequent Event | Plant Goat Rock Units 3 Through 6

Public Utilities, General Disclosures [Line Items]

Addition to nameplate capacity

16

Georgia Power | Plant Yates

Public Utilities, General Disclosures [Line Items]

Number of turbines | turbine

3

Approved additional generating capacity (in MW)

442

Georgia Power | Plant Bowen Units 1 and 2

Public Utilities, General Disclosures [Line Items]

Approved additional generating capacity (in MW)

1,400

Georgia Power | Customer Refunds | 2019 Alternate Rate Plan

Public Utilities, General Disclosures [Line Items]

Portion of actual earnings above approved ROE band refunded to customers, value | $

$ 117

Alabama Power

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount | $

$ 78

Percent Ownership

14%

14%

Alabama Power | SEGCO

Public Utilities, General Disclosures [Line Items]

Ownership percentage, equity method investment

50%

50%

Alabama Power | Subsequent Event | SEGCO

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

500

Maximum | Georgia Power

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

500

500

500

Maximum | Georgia Power | 2022 Alternate Rate Plan

Public Utilities, General Disclosures [Line Items]

Retail rate of return on common equity

11.90%

11.90%

Maximum | Georgia Power | 2019 Alternate Rate Plan

Public Utilities, General Disclosures [Line Items]

Retail rate of return on common equity

12%

12%

Maximum | Georgia Power | Subsequent Event

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

4,000

Maximum | Georgia Power | Plant Yates

Public Utilities, General Disclosures [Line Items]

Requested additional generating capacity (in MW)

1,400

Minimum | Georgia Power | 2022 Alternate Rate Plan

Public Utilities, General Disclosures [Line Items]

Retail rate of return on common equity

9.50%

9.50%

Minimum | Georgia Power | 2019 Alternate Rate Plan

Public Utilities, General Disclosures [Line Items]

Retail rate of return on common equity

9.50%

REGULATORY MATTERS - GPC Transm

REGULATORY MATTERS - GPC Transmission Asset Sales, Fuel Cost, and Storm Damage Recovery (Details) - USD ($) $ in Millions			1 Months Ended		3 Months Ended	12 Months Ended			24 Months Ended
	Apr. 24, 2024	Jan. 01, 2023	Sep. 30, 2024	May 31, 2023	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2022	Mar. 07, 2024
Public Utilities, General Disclosures [Line Items]
To be recovered amount				$ 2,200
Regulatory liabilities						$ 705
Regulatory asset							$ 66	$ 216	$ 216
Public utilities, property, plant and equipment, net						104,689	99,844
Deferred amount to be billed in 2025						476	533
Other operations and maintenance						6,539	6,093	6,824
Major storms
Public Utilities, General Disclosures [Line Items]
Storm damage reserves								239
Georgia Power
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 1,100				14,000
Requested rate increase (decrease), percentage				54%
Recovery period				3 years
Over (under) recovered fuel balance						$ (1,200)	(1,900)
Required period for options and hedges						36 months
Storm damage reserves		$ 31							213
Regulatory liabilities						$ 827	54
Regulatory asset								83	$ 83
Public utilities, property, plant and equipment, net						44,038	40,995
Deferred amount to be billed in 2025						262	305
Other operations and maintenance						2,372	2,083	2,349
Georgia Power | Major storms
Public Utilities, General Disclosures [Line Items]
Storm damage reserves								$ 213
Weather related damages			$ 870
Regulatory asset						750
Public utilities, property, plant and equipment, net						90
Deferred amount to be billed in 2025						30
Georgia Power | Under Recovered Fuel Clause Revenues
Public Utilities, General Disclosures [Line Items]
Over (under) recovered fuel balance						(713)	(694)
Georgia Power | Deferred Under Recovered Fuel Clause Revenues
Public Utilities, General Disclosures [Line Items]
Over (under) recovered fuel balance						(453)	(1,200)
Georgia Power | Other regulatory assets, current
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities						31	31
Georgia Power | Other Regulatory Assets
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities						$ 795	$ 23
Georgia Power | Maximum
Public Utilities, General Disclosures [Line Items]
Approved rate increase, percent				40%
Public utilities, approved rate increase (decrease), amount				$ 200
Southern Company And Georgia Power | Disposal Group, Held-for-sale, Not Discontinued Operations
Public Utilities, General Disclosures [Line Items]
Net book value										$ 236
Purchase price	$ 351
Gain on sale					$ 114
Gain on sale, after tax					$ 84

REGULATORY MATTERS - GPC Nuclea

REGULATORY MATTERS - GPC Nuclear Construction and Cost and Schedule (Details) $ in Millions	3 Months Ended	12 Months Ended				192 Months Ended
	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2012 utility MW	Dec. 31, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Pre-tax credit to income		$ 21	$ 68	$ (183)
Georgia Power
Public Utilities, General Disclosures [Line Items]
Number of construction units approved | utility					2
Electric generating capacity (in MWs) | MW					1,100
Pre-tax credit to income	$ 21	$ 21	68	$ (183)
After tax credit to income	$ 16
Plant Vogtle Units 3 and 4 | Georgia Power
Public Utilities, General Disclosures [Line Items]
Percent ownership		45.70%				45.70%
Total project capital cost forecast		$ 10,732				$ 10,732
Net investment		(10,663)				(10,663)
Remaining estimate to complete		69				69
Estimated cost to complete, costs not shared with other owners		1,200				1,200
Total AFUDC and interest capitalized, accrual amount		440	$ 14			440
Estimated construction financing costs		3,530				3,530
Proceeds from recovery of financing costs						3,080
Plant Vogtle Units 3 and 4 | Georgia Power | Twenty Fifth Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Maximum guarantee		1,700				$ 1,700
Customer refund		$ 188

REGULATORY MATTERS - GPC Joint

REGULATORY MATTERS - GPC Joint Owner Contracts (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 31, 2023	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]
Agreement with third party, amount of costs over projected forecast to be paid by company					20%
Georgia Power
Public Utilities, General Disclosures [Line Items]
Pre-tax charge to income		$ 7.6		$ 567
After tax charge to income		$ 5.7		$ 424
Plant Vogtle Units 3 and 4 | Georgia Power
Public Utilities, General Disclosures [Line Items]
Remaining share of construction costs, agreement to pay, percentage	66%
Pre-tax charge to income			$ 228
After tax charge to income			$ 170
Plant Vogtle Units 3 and 4 | Georgia Power | MEAG Power
Public Utilities, General Disclosures [Line Items]
Agreement with third party, expected cost					$ 91
Plant Vogtle Units 3 and 4 | Georgia Power | Oglethorpe Power Corporation
Public Utilities, General Disclosures [Line Items]
Agreement with third party, expected cost	$ 99
Plant Vogtle Units 3 and 4 | Georgia Power | Dalton Utilities
Public Utilities, General Disclosures [Line Items]
Agreement with third party, expected cost	$ 5.3

REGULATORY MATTERS - GPC Regula

REGULATORY MATTERS - GPC Regulatory Matters (Details) - USD ($) $ in Millions			1 Months Ended			3 Months Ended		12 Months Ended					192 Months Ended
	May 01, 2024	Aug. 01, 2023	Apr. 30, 2024	May 31, 2023	Dec. 31, 2022	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2009	Dec. 31, 2024
Public Utilities, General Disclosures [Line Items]
Net regulatory assets							$ 6,523	$ 7,041	$ 6,523				$ 7,041
Regulatory asset amortization period								4 years					4 years
Deferred Income Tax Charges
Public Utilities, General Disclosures [Line Items]
Net regulatory assets							897	$ 927	897				$ 927
Georgia Power
Public Utilities, General Disclosures [Line Items]
Requested recovery of construction costs						$ 10		760
Requested rate increase (decrease), amount				$ 1,100						$ 14,000
Net regulatory assets							5,090	6,139	5,090				6,139
Pre-tax charge to income						7.6			567
After tax charge to income						5.7			424
Requested rate increase (decrease), percentage				54%
Georgia Power | Deferred Income Tax Charges
Public Utilities, General Disclosures [Line Items]
Net regulatory assets							605	$ 634	605				634
Plant Vogtle Units 3 and 4 | Georgia Power
Public Utilities, General Disclosures [Line Items]
Estimated in-service capital cost												$ 4,418
Proceeds from recovery of financing costs													$ 3,080
Requested recovery of construction costs												7,562
Increase (decrease) in tariff					$ 36
Public utilities, approved rate increase (decrease), amount											$ 2,100	5,462
Requested rate increase (decrease), amount												730
Regulatory asset amortization period								10 years					10 years
Requested recovery of rate base items												1,020
Approved recovery of retail base rate											362
Requested recovery of remaining retail rate base items												$ 647
Return on equity reduction, negative impact on earnings			$ 10			$ 80			$ 310	$ 300
Pre-tax charge to income							228
After tax charge to income							$ 170
Authorized ROE						0%
Requested rate increase (decrease), percentage	5%
Plant Vogtle Units 3 and 4 | Georgia Power | Deferred Income Tax Charge, Debt Component
Public Utilities, General Disclosures [Line Items]
Net regulatory assets								$ 23					$ 23
Plant Vogtle Units 3 and 4 | Georgia Power | Deferred Income Tax Charges
Public Utilities, General Disclosures [Line Items]
Net regulatory assets								$ 29					$ 29
Regulatory asset amortization period								10 years					10 years
Plant Vogtle Units 3 and 4 | Georgia Power | Deferred Income Tax Charge, Equity Component
Public Utilities, General Disclosures [Line Items]
Net regulatory assets								$ 39					$ 39
Plant Vogtle Units 3 and 4 | Georgia Power
Public Utilities, General Disclosures [Line Items]
Public utilities, approved rate increase (decrease), amount											2,100
Requested rate increase (decrease), amount											$ 3,600
Requested rate increase, annual amount		$ 318

REGULATORY MATTERS - MPC Perfor

REGULATORY MATTERS - MPC Performance Evaluation Plan (Details) - Mississippi Power $ in Millions	1 Months Ended			12 Months Ended
	Jul. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2024 scale filing	Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures [Line Items]
Scale of performance evaluation | scale				10
Performance evaluation plan, number of filings per calendar year | filing				2
Public utilities, approved rate increase (decrease), amount | $	$ (5)	$ (7)	$ 18		$ 9
Approved rate decrease, percent			(1.90%)
Weighted Average | Measurement Input, Average Customer Price
Public Utilities, General Disclosures [Line Items]
Performance evaluation plan, measurement input				0.40
Weighted Average | Measurement Input, Service Reliability
Public Utilities, General Disclosures [Line Items]
Performance evaluation plan, measurement input				0.40
Weighted Average | Measurement Input, Customer Satisfaction
Public Utilities, General Disclosures [Line Items]
Performance evaluation plan, measurement input				0.20

REGULATORY MATTERS - MPC Integr

REGULATORY MATTERS - MPC Integrated Resource Plan (Details) $ in Millions			1 Months Ended
	Jan. 09, 2025 MW	Apr. 26, 2024	Oct. 31, 2023 MW	Dec. 31, 2024 USD ($)	Nov. 08, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2021 MW	Dec. 31, 2020 MW
Public Utilities, General Disclosures [Line Items]
Net regulatory assets | $				$ 7,041		$ 6,523
Mississippi Power
Public Utilities, General Disclosures [Line Items]
Required fossil-stream generation retirements (in MWs)								950
Approved additional generating capacity (in MW)			750
Review period		120 days
Net regulatory assets | $				$ 59		$ 90
Mississippi Power | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Approved additional generating capacity (in MW)	600
Mississippi Power | Plant Watson Unit 4
Public Utilities, General Disclosures [Line Items]
Required fossil-stream generation retirements (in MWs)							268
Mississippi Power | Plant Greene County Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Required fossil-stream generation retirements (in MWs)							206
Percent ownership				40%
Mississippi Power | Plant Greene County Units 1 and 2 | Alabama Power
Public Utilities, General Disclosures [Line Items]
Percent ownership							40%
Mississippi Power | Plant Daniel
Public Utilities, General Disclosures [Line Items]
Required fossil-stream generation retirements (in MWs)							502
Percent ownership		50%					50%
Net regulatory assets | $				$ 478
Mississippi Power | Plant Daniel | Minimum
Public Utilities, General Disclosures [Line Items]
Acquisition payment receivable | $					$ 35
Mississippi Power | Plant Daniel | Maximum
Public Utilities, General Disclosures [Line Items]
Acquisition payment receivable | $					$ 38

REGULATORY MATTERS - MPC Enviro

REGULATORY MATTERS - MPC Environmental Compliance Overview Plan (Details) - Mississippi Power - USD ($) $ in Millions				1 Months Ended						12 Months Ended
	Feb. 14, 2025	Feb. 13, 2025	Oct. 25, 2024	Jul. 31, 2024	May 31, 2024	Jun. 30, 2023	Apr. 30, 2023	Jun. 30, 2022	Apr. 30, 2022	Dec. 31, 2021
Public Utilities, General Disclosures [Line Items]
Public utilities, approved rate increase (decrease), amount				$ (5)		$ (7)		$ 18		$ 9
Requested rate increase (decrease), amount			$ 11
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 8
Environmental Compliance Overview Plan
Public Utilities, General Disclosures [Line Items]
Public utilities, approved rate increase (decrease), amount					$ 9		$ 3		$ 1
Environmental Compliance Overview Plan | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 6

REGULATORY MATTERS - MPC Fuel C

REGULATORY MATTERS - MPC Fuel Cost Recovery and Ad Valorem Tax Adjustment (Details) - Mississippi Power - USD ($) $ in Millions

1 Months Ended

12 Months Ended

Feb. 06, 2024

Jul. 31, 2024

Jun. 30, 2023

Jul. 31, 2022

Jun. 30, 2022

Feb. 28, 2022

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2021

Oct. 31, 2024

Oct. 31, 2023

Public Utilities, General Disclosures [Line Items]

Public utilities, approved rate increase (decrease), amount

$ (5)

$ (7)

$ 18

$ 9

Ad Valorem Tax Adjustment

Public Utilities, General Disclosures [Line Items]

Public utilities, approved rate increase (decrease), amount

$ 5

Retail electric revenues

Public Utilities, General Disclosures [Line Items]

Public utilities, approved rate increase (decrease), amount

$ 18

$ 43

Over (under) recovered fuel cost

$ (32)

$ (50)

$ (25)

$ (61)

Retail ECM

Public Utilities, General Disclosures [Line Items]

Over (under) recovered fuel cost

32

27

MRA Revenue

Public Utilities, General Disclosures [Line Items]

Public utilities, approved rate increase (decrease), amount

4

22

Over (under) recovered fuel cost

$ 19

$ (5)

MRA Revenue | Scenario, Forecast

Public Utilities, General Disclosures [Line Items]

Public utilities, approved rate increase (decrease), amount

$ (19)

REGULATORY MATTERS - MPC System

REGULATORY MATTERS - MPC System Restoration Rider and Reliability Reserve Accounting Order (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Jul. 31, 2024	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Apr. 11, 2024	Apr. 30, 2023	Mar. 31, 2023
Public Utilities, General Disclosures [Line Items]
Reliability reserve, amount deferred				$ 84,000	$ 63,000	$ 191,000
Net regulatory assets				7,041,000	6,523,000
Reliability reserves
Public Utilities, General Disclosures [Line Items]
Net regulatory assets				(188,000)	(179,000)
Major storms
Public Utilities, General Disclosures [Line Items]
Storm damage reserves accrual						239,000
Mississippi Power
Public Utilities, General Disclosures [Line Items]
Threshold above which actual damages are charged to the reserve (individually exceed)				50
Public utilities, approved rate increase (decrease), amount	$ (5,000)	$ (7,000)	$ 18,000				$ 9,000
Reliability reserve, amount deferred				21,000	11,000	25,000		$ 12,600	$ 11,700	$ 8,300
Net regulatory assets				59,000	90,000
Mississippi Power | Reliability reserves
Public Utilities, General Disclosures [Line Items]
Net regulatory assets				(57,000)	(36,000)
Mississippi Power | Retail electric revenues
Public Utilities, General Disclosures [Line Items]
Property damage reserve				52,000	45,000
Mississippi Power | Major storms
Public Utilities, General Disclosures [Line Items]
Storm damage reserves accrual				$ 12,600	$ 11,700	$ 6,900

REGULATORY MATTERS - MPC Munici

REGULATORY MATTERS - MPC Municipal and Rural Associations Tariff (Details) - Mississippi Power $ in Millions					1 Months Ended
	Dec. 23, 2024 USD ($)	Oct. 25, 2024 USD ($)	May 28, 2024 USD ($)	Jul. 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Dec. 31, 2024 MW	Aug. 31, 2022
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 11
Municipal and Rural Associations Tariff
Public Utilities, General Disclosures [Line Items]
Counterparty's option to decrease services, percentage	2.50%
Requested rate increase (decrease), amount	$ 1		$ 8	$ 16	$ 23
Refund to customers	$ 4			$ 6
Cooperative Energy
Public Utilities, General Disclosures [Line Items]
Counterparty's option to decrease services, percentage							2.50%
Power being supplied to counterparty | MW						385
Counterparty's electricity requirement at MRA delivery points						100%

REGULATORY MATTERS - GAS Schedu

REGULATORY MATTERS - GAS Schedule of Utility Regulation and Rate Design (Details)	1 Months Ended		12 Months Ended
	Nov. 30, 2023	Aug. 31, 2023	Dec. 31, 2024
Nicor Gas
Public Utilities, General Disclosures [Line Items]
Authorized ROE	9.51%		9.51%
Atlanta Gas Light
Public Utilities, General Disclosures [Line Items]
Authorized ROE			10.25%
Virginia Natural Gas
Public Utilities, General Disclosures [Line Items]
Authorized ROE		9.70%	9.70%
Chattanooga Gas
Public Utilities, General Disclosures [Line Items]
Authorized ROE			9.80%

REGULATORY MATTERS - GAS Infras

REGULATORY MATTERS - GAS Infrastructure Replacement Programs and Capital Projects and Natural Gas Recovery (Details) $ in Millions				1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 24, 2024 USD ($)	Jul. 02, 2024 USD ($)	Jun. 07, 2024 USD ($)	Nov. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) mi	Dec. 31, 2019 USD ($)	Dec. 31, 2014
Public Utilities, General Disclosures [Line Items]
Revenues							$ (26,724)	$ (25,253)	$ (29,279)
Total operating expenses							19,656	19,427	23,909
Southern Company Gas
Public Utilities, General Disclosures [Line Items]
Capital expenditures							186
Pretax charge to income							0	96	0
Revenues							(4,456)	(4,702)	(5,962)
Total operating expenses							3,329	3,763	5,148
Southern Company Gas | Natural Gas Cost Under Recovery
Public Utilities, General Disclosures [Line Items]
Over (under) recovered fuel cost					$ 214		(193)	214
Southern Company Gas | SAVE
Public Utilities, General Disclosures [Line Items]
Program duration period			5 years
Capital expenditures							75
Infrastructure replacement program, approved investment variance amount			$ 5
Nicor Gas
Public Utilities, General Disclosures [Line Items]
Infrastructure disallowed					69
Pretax charge to income					58	$ 38	(96)
After tax charge to income					$ 44	28	(72)
Nicor Gas | Other Transmission and Distribution Capital Investments
Public Utilities, General Disclosures [Line Items]
Infrastructure disallowed				$ 95.9
Nicor Gas | Investing In Illinois Qualifying Infrastructure Plant
Public Utilities, General Disclosures [Line Items]
Infrastructure disallowed	$ 14			126.8			$ 63				$ 32
Capital expenditures											$ 415
Revenues						8
Total operating expenses						$ 30
Nicor Gas | QIP Rider
Public Utilities, General Disclosures [Line Items]
Infrastructure disallowed				$ 31
Nicor Gas | Maximum
Public Utilities, General Disclosures [Line Items]
Infrastructure investment, annual customer rate increase												4%
Infrastructure investment, annual customer rate increase in any given year												5.50%
Virginia Natural Gas | SAVE
Public Utilities, General Disclosures [Line Items]
Program duration period							6 years
Infrastructure replacement program, approved investment variance amount							$ 5
Atlanta Gas Light
Public Utilities, General Disclosures [Line Items]
Gain contingency, unrecorded amount							22
Annual proceeds from strategic economic development projects							15
Approved annual recovery of capital investment		$ 600							286
Chattanooga Gas
Public Utilities, General Disclosures [Line Items]
Program duration period										7 years
Pipeline replacement program, length of distribution main | mi										73
Total project capital cost forecast										$ 118
Operating Segments
Public Utilities, General Disclosures [Line Items]
Revenues							(26,059)	(24,700)	(28,835)
Operating Segments | Southern Company Gas
Public Utilities, General Disclosures [Line Items]
Revenues							(4,447)	(4,685)	(5,937)
Operating Segments | Gas distribution operations | Southern Company Gas
Public Utilities, General Disclosures [Line Items]
Gross property additions							1,700
Revenues							$ (3,899)	$ (4,105)	$ (5,267)

REGULATORY MATTERS - GAS Sche_2

REGULATORY MATTERS - GAS Schedule of Infrastructure Replacement Programs and Capital Projects (Details) - Southern Company Gas $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) mi	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Capital Expenditures in 2024	$ 186
Capital Expenditures Since Project Inception	$ 868
Pipe Installed Since Project Inception (in miles) | mi	651
Scope of Program (in miles) | mi	1,011
SAVE
Public Utilities, General Disclosures [Line Items]
Capital Expenditures in 2024	$ 75
Capital Expenditures Since Project Inception	$ 561
Pipe Installed Since Project Inception (in miles) | mi	598
Scope of Program (in miles) | mi	938
Program Duration	18 years
System Reinforcement Rider
Public Utilities, General Disclosures [Line Items]
Capital Expenditures in 2024	$ 99	$ 104	$ 76
Capital Expenditures Since Project Inception	$ 279
Pipe Installed Since Project Inception (in miles) | mi	29
Program Duration	6 years
Pipeline Replacement Program
Public Utilities, General Disclosures [Line Items]
Capital Expenditures in 2024	$ 12
Capital Expenditures Since Project Inception	$ 28
Pipe Installed Since Project Inception (in miles) | mi	24
Scope of Program (in miles) | mi	73
Program Duration	7 years

REGULATORY MATTERS - GAS Rate P

REGULATORY MATTERS - GAS Rate Proceedings and Deferral of Incremental COVID-19 Costs (Details) - USD ($) $ in Millions

1 Months Ended

3 Months Ended

12 Months Ended

Jan. 01, 2027

Jan. 01, 2026

Jan. 03, 2025

Jan. 01, 2025

Dec. 24, 2024

Aug. 01, 2024

Jul. 02, 2024

Jun. 07, 2024

Jan. 01, 2024

Jan. 01, 2023

Nov. 30, 2023

Aug. 31, 2023

Nov. 30, 2021

Apr. 30, 2021

Dec. 31, 2023

Jun. 30, 2023

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2019

Public Utilities, General Disclosures [Line Items]

Net regulatory assets

$ 6,523

$ 7,041

$ 6,523

Nicor Gas

Public Utilities, General Disclosures [Line Items]

Public utilities, approved rate increase (decrease), amount

$ 223

Authorized ROE

9.51%

9.51%

Public utilities, approved equity capital structure, percentage

50%

Infrastructure disallowed

69

Pretax charge to income

58

$ 38

$ (96)

After tax charge to income

44

$ 28

(72)

Nicor Gas | Subsequent Event

Public Utilities, General Disclosures [Line Items]

Authorized ROE

10.35%

Public utilities, approved equity capital structure, percentage

54.60%

Requested rate increase (decrease), amount

$ 309

Nicor Gas | Investing In Illinois Qualifying Infrastructure Plant

Public Utilities, General Disclosures [Line Items]

Infrastructure disallowed

$ 14

$ 126.8

63

$ 32

Nicor Gas | QIP Rider

Public Utilities, General Disclosures [Line Items]

Infrastructure disallowed

31

Nicor Gas | Other Transmission and Distribution Capital Investments

Public Utilities, General Disclosures [Line Items]

Infrastructure disallowed

$ 95.9

Atlanta Gas Light

Public Utilities, General Disclosures [Line Items]

Public utilities, approved rate increase (decrease), amount

$ (9)

(7)

$ (5)

Authorized ROE

10.25%

Public utilities, maximum base rate percentage

5%

Integrated capacity delivery plan, capital budgets and related operations and maintenance spending, term

10 years

Approved rate decrease, percent

10%

Integrated capacity delivery plan, capital forecast plan, years one through three

$ 1,700

Approved annual recovery of capital investment

$ 600

286

Atlanta Gas Light | Minimum

Public Utilities, General Disclosures [Line Items]

Authorized ROE

10.05%

Integrated capacity delivery plan, capital forecast plan, years one through ten

$ 500

Atlanta Gas Light | Maximum

Public Utilities, General Disclosures [Line Items]

Authorized ROE

10.45%

Integrated capacity delivery plan, capital forecast plan, years one through ten

$ 600

Southern Company Gas

Public Utilities, General Disclosures [Line Items]

Pretax charge to income

$ 0

96

$ 0

Requested rate increase (decrease), amount

$ 53

$ 53

Net regulatory assets

$ (2,225)

$ (2,252)

$ (2,225)

Southern Company Gas | Scenario, Forecast

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 74

$ 73

$ 72

Southern Company Gas | SAVE

Public Utilities, General Disclosures [Line Items]

Approved infrastructure replacement program, approved investment amount, current fiscal year

$ 355

Infrastructure replacement program, approved investment variance amount

$ 5

Program duration period

5 years

Southern Company Gas | SAVE | 2029

Public Utilities, General Disclosures [Line Items]

Approved infrastructure replacement program, approved investment amount, current fiscal year

$ 70

Southern Company Gas | SAVE | 2027

Public Utilities, General Disclosures [Line Items]

Approved infrastructure replacement program, approved investment amount, current fiscal year

70

Southern Company Gas | SAVE | 2025

Public Utilities, General Disclosures [Line Items]

Approved infrastructure replacement program, approved investment amount, current fiscal year

70

Southern Company Gas | SAVE | 2028

Public Utilities, General Disclosures [Line Items]

Approved infrastructure replacement program, approved investment amount, current fiscal year

70

Southern Company Gas | SAVE | 2026

Public Utilities, General Disclosures [Line Items]

Approved infrastructure replacement program, approved investment amount, current fiscal year

$ 70

Virginia Natural Gas

Public Utilities, General Disclosures [Line Items]

Public utilities, approved rate increase (decrease), amount

$ 48

Authorized ROE

9.70%

9.70%

Public utilities, approved equity capital structure, percentage

49.06%

Requested rate increase (decrease), amount

$ 69

Virginia Natural Gas | Virginia Commission

Public Utilities, General Disclosures [Line Items]

Authorized ROE

10.45%

Public utilities, approved equity capital structure, percentage

54.92%

Requested rate increase (decrease), amount

$ 63

Virginia Natural Gas | SAVE

Public Utilities, General Disclosures [Line Items]

Approved infrastructure replacement program, approved investment amount, current fiscal year

$ 365

Infrastructure replacement program, approved investment variance amount

$ 5

Program duration period

6 years

Virginia Natural Gas | SAVE | Virginia Commission

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 17

Virginia Natural Gas | SAVE | Year 2023

Public Utilities, General Disclosures [Line Items]

Approved infrastructure replacement program, approved investment amount, current fiscal year

$ 70

Virginia Natural Gas | SAVE | Year 2022

Public Utilities, General Disclosures [Line Items]

Approved infrastructure replacement program, approved investment amount, current fiscal year

70

Virginia Natural Gas | SAVE | Year 2024

Public Utilities, General Disclosures [Line Items]

Approved infrastructure replacement program, approved investment amount, current fiscal year

$ 70

REGULATORY MATTERS - GAS Sche_3

REGULATORY MATTERS - GAS Schedule of Unrecognized Ratemaking Amounts (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset		$ 66	$ 216
Regulatory Asset Off Balance Sheet | Atlanta Gas Light
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset	$ 11	23
Regulatory Asset Off Balance Sheet | Virginia Natural Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset	10	10
Regulatory Asset Off Balance Sheet | Chattanooga Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset	7	7
Regulatory Asset Off Balance Sheet | Nicor Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset	0	3
Regulatory Asset Off Balance Sheet | Southern Company Gas
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset	$ 28	$ 43

REGULATORY MATTERS - GAS Capita

REGULATORY MATTERS - GAS Capital Projects Schedule of QIP (Details) - Nicor Gas - USD ($) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 24, 2024	Nov. 30, 2023	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2019
Commitments [Line Items]
Disallowed			$ 69
Investing In Illinois Qualifying Infrastructure Plant
Commitments [Line Items]
Capital Investments				$ 3,228
Disallowed	$ 14	$ 126.8		63	$ 32
Investing In Illinois Qualifying Infrastructure Plant | Complete
Commitments [Line Items]
Capital Investments				1,246
Disallowed				0
Investing In Illinois Qualifying Infrastructure Plant | Complete, Appealed
Commitments [Line Items]
Capital Investments				415
Disallowed				32
Investing In Illinois Qualifying Infrastructure Plant | Filed March 2021
Commitments [Line Items]
Capital Investments				402
Investing In Illinois Qualifying Infrastructure Plant | Filed March 2022
Commitments [Line Items]
Capital Investments				392
Investing In Illinois Qualifying Infrastructure Plant | Filed March 2023
Commitments [Line Items]
Capital Investments				408
Disallowed				6
Investing In Illinois Qualifying Infrastructure Plant | Filed March 2024
Commitments [Line Items]
Capital Investments				365
Disallowed				$ 25

CONTINGENCIES, COMMITMENTS, A_3

CONTINGENCIES, COMMITMENTS, AND GUARANTEES - SO Litigation (Details) - Kemper County energy facility assets, net - Mississippi Power - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2010
Loss Contingencies [Line Items]
Government grants expected		$ 137	$ 270
Government grants received	$ 387

CONTINGENCIES, COMMITMENTS, A_4

CONTINGENCIES, COMMITMENTS, AND GUARANTEES - GPC Litigation (Details) - claim	1 Months Ended
	Jan. 31, 2023	Feb. 28, 2022	Oct. 31, 2021
Class Action Lawsuit | Pending Litigation | Georgia Power
Loss Contingencies [Line Items]
Number of additional complaints filed	8	8	8

CONTINGENCIES, COMMITMENTS, A_5

CONTINGENCIES, COMMITMENTS, AND GUARANTEES - Environmental Remediation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Georgia Power
Environmental Exit Cost [Line Items]
Costs recovered annually	$ 5,000,000	$ 5,000,000	$ 12,000,000
Environmental remediation liability, current	13,000,000	14,000,000
Accrued environmental remediation	0	0
Under recovered environmental remediation costs, other regulatory assets, current	5,000,000	5,000,000
Under recovered environmental remediation costs, other regulatory assets, deferred	11,000,000	15,000,000
Southern Company Gas
Environmental Exit Cost [Line Items]
Environmental remediation liability, current	24,000,000	30,000,000
Accrued environmental remediation	198,000,000	192,000,000
Under recovered environmental remediation costs, other regulatory assets, current	32,000,000	40,000,000
Under recovered environmental remediation costs, other regulatory assets, deferred	201,000,000	195,000,000
Alabama Power
Environmental Exit Cost [Line Items]
Environmental remediation liability, current	0	0
Southern Company
Environmental Exit Cost [Line Items]
Environmental remediation liability, current	37,000,000	44,000,000
Accrued environmental remediation	198,000,000	192,000,000
Under recovered environmental remediation costs, other regulatory assets, current	37,000,000	45,000,000
Under recovered environmental remediation costs, other regulatory assets, deferred	$ 212,000,000	$ 210,000,000
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current

CONTINGENCIES, COMMITMENTS, A_6

CONTINGENCIES, COMMITMENTS, AND GUARANTEES - Nuclear Fuel Disposal Costs and Nuclear Insurance (Details) $ in Millions	12 Months Ended	108 Months Ended
	Dec. 31, 2024 USD ($) plant	Dec. 31, 2019 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Maximum fund for public liability claims arising from a single nuclear incident under price - anderson amendments act	$ 16,300
Maximum insurance coverage provided by American Nuclear Insurers to each nuclear plant	500
Maximum amount that a company could be assessed per incident for each licensed reactor	166
Maximum aggregate amount that a reactor can assess in a calendar period for each incident	$ 25
Block period considered for inflation adjustment against maximum assessment per reactor	5 years
Maximum deductible waiting period	182 days
Maximum coverage per occurrence per unit limit to obtain replacement power	$ 490
Aggregate payment for claims resulting from terrorist acts in one year period	$ 3,200
Alabama Power and Georgia Power
Jointly Owned Utility Plant Interests [Line Items]
Number of nuclear fuel plants | plant	3
Maximum property damage insurance provided to nuclear generating facilities	$ 1,500
Maximum additional coverage provided for losses under excess insurance	1,250
Maximum additional coverage provided for losses under excess insurance, non-nuclear losses	$ 750
Elected deductible waiting period	84 days
Alabama Power
Jointly Owned Utility Plant Interests [Line Items]
Maximum assessment, excluding any applicable state premium taxes	$ 332
Maximum aggregate amount to be paid in one year	49
Current maximum annual assessments under NEIL policies	60
Alabama Power | Positive Outcome of Litigation
Jointly Owned Utility Plant Interests [Line Items]
Outstanding claims		$ 100
Georgia Power
Jointly Owned Utility Plant Interests [Line Items]
Maximum assessment, excluding any applicable state premium taxes	473
Maximum aggregate amount to be paid in one year	71
Current maximum annual assessments under NEIL policies	$ 80
Georgia Power | Court Of Federal Claims
Jointly Owned Utility Plant Interests [Line Items]
Litigation settlement		$ 121

CONTINGENCIES, COMMITMENTS, A_7

CONTINGENCIES, COMMITMENTS, AND GUARANTEES - MPC and Traditional Electric Operating Companies Other Matters (Details) - USD ($) $ in Millions	12 Months Ended			60 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2025
Loss Contingencies [Line Items]
Period costs	$ 130	$ 90
Mississippi Power
Loss Contingencies [Line Items]
Period costs	0	0
Alabama Power
Loss Contingencies [Line Items]
Period costs	8	0
Kemper County energy facility assets, net | Mississippi Power
Loss Contingencies [Line Items]
Pre-tax charge to income	12	17	$ 15
After tax charge to income	$ 9	$ 12	$ 12
Scenario, Forecast | Kemper County energy facility assets, net | Mississippi Power | Maximum
Loss Contingencies [Line Items]
Period costs				$ 15

CONTINGENCIES, COMMITMENTS, A_8

CONTINGENCIES, COMMITMENTS, AND GUARANTEES - Commitments (Details) - Georgia Power - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Plant Vogtle (nuclear) Units 1 and 2
Recorded Unconditional Purchase Obligation [Line Items]
Capacity payments	$ 4	$ 3	$ 4
Total	35
Recorded unconditional purchase obligation, year one	3
Recorded unconditional purchase obligation, year four	2
Recorded unconditional purchase obligation, year three	2
Recorded unconditional purchase obligation, year two	2
Recorded unconditional purchase obligation, after year five	$ 24
MEAG Power
Recorded Unconditional Purchase Obligation [Line Items]
Percent Ownership	5%

CONTINGENCIES, COMMITMENTS, A_9

CONTINGENCIES, COMMITMENTS, AND GUARANTEES - Guarantees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Recorded Unconditional Purchase Obligation [Line Items]
Notes payable	$ 1,338	$ 2,314
Alabama Power
Recorded Unconditional Purchase Obligation [Line Items]
Jointly owned affiliate equity	56
Jointly owned affiliate long term debt	80
Notes payable	0	$ 40
SEGCO | Alabama Power
Recorded Unconditional Purchase Obligation [Line Items]
Guarantee of unsecured senior notes	100
Notes payable	$ 0

REVENUE FROM CONTRACTS WITH C_3

REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregate Revenue Sources (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 26,764	$ 24,828	$ 25,941
Total operating revenues	26,724	25,253	29,279
Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18,877	16,894	15,839
Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,276	7,309	6,604
Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,585	5,860	5,369
Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,892	3,613	3,764
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	124	112	102
Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,815	4,039	5,218
Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,753	1,981	2,843
Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	417	505	763
Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,295	1,184	1,186
Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	34	45	84
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	316	324	342
Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,926	1,981	3,120
PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,059	1,107	2,274
PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	641	624	596
Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	226	250	250
Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	525	559	687
Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	507	528	636
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18	31	51
Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,621	1,355	1,077
Other revenue sources
Disaggregation of Revenue [Line Items]
Other	(40)	425	3,338
Alabama Power
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,623	7,233	6,921
Total operating revenues	7,554	7,050	7,817
Alabama Power | Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,930	6,565	5,844
Alabama Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,133	2,904	2,638
Alabama Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,042	1,928	1,685
Alabama Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,742	1,721	1,507
Alabama Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13	12	14
Alabama Power | Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	453	455	883
Alabama Power | PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	206	234	489
Alabama Power | PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	108	156	194
Alabama Power | Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	139	65	200
Alabama Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	240	213	194
Alabama Power | Other revenue sources
Disaggregation of Revenue [Line Items]
Other	(69)	(183)	896
Georgia Power
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,920	10,129	9,702
Total operating revenues	11,331	10,118	11,584
Georgia Power | Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,964	9,378	9,049
Georgia Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,835	4,105	3,664
Georgia Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,219	3,624	3,385
Georgia Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,808	1,558	1,921
Georgia Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	102	91	79
Georgia Power | Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	235	173	207
Georgia Power | PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	94	87	130
Georgia Power | PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	136	51	47
Georgia Power | Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5	35	30
Georgia Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	721	578	446
Georgia Power | Other revenue sources
Disaggregation of Revenue [Line Items]
Other	(589)	(11)	1,882
Mississippi Power
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,477	1,462	1,703
Total operating revenues	1,463	1,474	1,694
Mississippi Power | Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	983	951	946
Mississippi Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	308	300	302
Mississippi Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	324	308	299
Mississippi Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	342	334	336
Mississippi Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9	9	9
Mississippi Power | Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	442	472	710
Mississippi Power | PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	20	16
Mississippi Power | PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	63	45	4
Mississippi Power | Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	375	407	690
Mississippi Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52	39	47
Mississippi Power | Other revenue sources
Disaggregation of Revenue [Line Items]
Other	(14)	12	(9)
Southern Power
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,445	1,630	2,805
Total operating revenues	2,014	2,189	3,369
Southern Power | Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,408	1,575	2,769
Southern Power | PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	778	790	1,673
Southern Power | PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	400	376	356
Southern Power | Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	230	409	740
Southern Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	37	55	36
Southern Power | Other revenue sources
Disaggregation of Revenue [Line Items]
Other	569	559	564
Southern Company Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,340	4,598	5,905
Total operating revenues	4,456	4,702	5,962
Southern Company Gas | Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,815	4,039	5,218
Southern Company Gas | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,753	1,981	2,843
Southern Company Gas | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	417	505	763
Southern Company Gas | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,295	1,184	1,186
Southern Company Gas | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	34	45	84
Southern Company Gas | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	316	324	342
Southern Company Gas | Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	525	559	687
Southern Company Gas | Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	507	528	636
Southern Company Gas | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18	31	51
Southern Company Gas | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Other revenue sources
Disaggregation of Revenue [Line Items]
Other	$ 116	$ 104	$ 57

REVENUE FROM CONTRACTS WITH C_4

REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Accounts Receivable	$ 3,048	$ 2,820
Contract Assets	323	271
Contract Liabilities	140	116
Contract with customer, liability, revenue recognized	98	36
Unregulated Distributed Generation
Disaggregation of Revenue [Line Items]
Contract Assets	67	91
Contract Liabilities	95	115
Alabama Power
Disaggregation of Revenue [Line Items]
Accounts Receivable	783	821
Contract Assets	3	2
Contract Liabilities	11	0
Georgia Power
Disaggregation of Revenue [Line Items]
Accounts Receivable	1,244	1,011
Contract Assets	184	121
Contract Liabilities	34	1
Mississippi Power
Disaggregation of Revenue [Line Items]
Accounts Receivable	113	90
Contract Assets	0	0
Contract Liabilities	0	0
Southern Power
Disaggregation of Revenue [Line Items]
Accounts Receivable	106	122
Contract Assets	0	0
Contract Liabilities	2	4
Southern Company Gas
Disaggregation of Revenue [Line Items]
Accounts Receivable	660	684
Contract Assets	72	56
Contract Liabilities	3	$ 0
Southern Company Gas | Energy Efficiency Enhancement And Upgrade
Disaggregation of Revenue [Line Items]
Contract Liabilities	$ 68

REVENUE FROM CONTRACTS WITH C_5

REVENUE FROM CONTRACTS WITH CUSTOMERS - Performance Obligations (Details) $ in Millions	Dec. 31, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 937
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 427
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 371
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 343
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 309
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 2,636
Expected timing of satisfaction
Alabama Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 11
Expected timing of satisfaction	1 year
Alabama Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction	1 year
Alabama Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction	1 year
Alabama Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction	1 year
Alabama Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction	1 year
Alabama Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction
Georgia Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 69
Expected timing of satisfaction	1 year
Georgia Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 30
Expected timing of satisfaction	1 year
Georgia Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 15
Expected timing of satisfaction	1 year
Georgia Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 16
Expected timing of satisfaction	1 year
Georgia Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 2
Expected timing of satisfaction	1 year
Georgia Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 27
Expected timing of satisfaction
Mississippi Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 63
Expected timing of satisfaction	1 year
Mississippi Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 66
Expected timing of satisfaction	1 year
Mississippi Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 69
Expected timing of satisfaction	1 year
Mississippi Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 73
Expected timing of satisfaction	1 year
Mississippi Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction	1 year
Mississippi Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction
Southern Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 340
Expected timing of satisfaction	1 year
Southern Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 331
Expected timing of satisfaction	1 year
Southern Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 340
Expected timing of satisfaction	1 year
Southern Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 316
Expected timing of satisfaction	1 year
Southern Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 312
Expected timing of satisfaction	1 year
Southern Power | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 2,609
Expected timing of satisfaction
Southern Company Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 2
Expected timing of satisfaction	1 year
Southern Company Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction	1 year
Southern Company Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction	1 year
Southern Company Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction	1 year
Southern Company Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction	1 year
Southern Company Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Expected timing of satisfaction

PROPERTY, PLANT, AND EQUIPMEN_2

PROPERTY, PLANT, AND EQUIPMENT - Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Electric utilities:
Generation	$ 61,292	$ 57,325
Transmission	16,280	15,561
Distribution	28,678	26,482
General/other	6,547	6,305
Electric utilities' plant in service	112,797	105,673
Southern Company Gas:
Natural gas transportation and distribution	18,896	17,798
Storage facilities	1,748	1,565
Other	1,694	1,477
Southern Company Gas plant in service	22,338	20,840
Other plant in service	2,008	1,915
Total plant in service	137,143	128,428
Alabama Power
Electric utilities:
Generation	16,801	16,584
Transmission	6,449	6,152
Distribution	10,373	9,775
General/other	2,878	2,918
Electric utilities' plant in service	36,501	35,429
Southern Company Gas:
Natural gas transportation and distribution	0	0
Storage facilities	0	0
Other	0	0
Southern Company Gas plant in service	0	0
Other plant in service	0	0
Total plant in service	36,501	35,429
Georgia Power
Electric utilities:
Generation	26,089	22,587
Transmission	8,800	8,402
Distribution	16,887	15,380
General/other	3,260	3,001
Electric utilities' plant in service	55,036	49,370
Southern Company Gas:
Natural gas transportation and distribution	0	0
Storage facilities	0	0
Other	0	0
Southern Company Gas plant in service	0	0
Other plant in service	0	0
Total plant in service	55,036	49,370
Mississippi Power
Electric utilities:
Generation	2,946	2,909
Transmission	989	966
Distribution	1,418	1,327
General/other	344	321
Electric utilities' plant in service	5,697	5,523
Southern Company Gas:
Natural gas transportation and distribution	0	0
Storage facilities	0	0
Other	0	0
Southern Company Gas plant in service	0	0
Other plant in service	0	0
Total plant in service	5,697	5,523
Southern Power
Electric utilities:
Generation	14,920	14,649
Transmission	0	0
Distribution	0	0
General/other	41	41
Electric utilities' plant in service	14,961	14,690
Southern Company Gas:
Natural gas transportation and distribution	0	0
Storage facilities	0	0
Other	0	0
Southern Company Gas plant in service	0	0
Other plant in service	0	0
Total plant in service	14,961	14,690
Southern Company Gas
Electric utilities:
Generation	0	0
Transmission	0	0
Distribution	0	0
General/other	0	0
Electric utilities' plant in service	0	0
Southern Company Gas:
Natural gas transportation and distribution	18,896	17,798
Storage facilities	1,748	1,565
Other	1,694	1,477
Southern Company Gas plant in service	22,338	20,840
Other plant in service	0	0
Total plant in service	$ 22,338	$ 20,840

PROPERTY, PLANT, AND EQUIPMEN_3

PROPERTY, PLANT, AND EQUIPMENT - Additional Information (Narrative) (Details) - USD ($) $ in Millions					1 Months Ended		12 Months Ended
	Feb. 13, 2025	Oct. 25, 2024	Jan. 01, 2024	Jan. 01, 2023	Jun. 30, 2023	May 31, 2023	Dec. 31, 2024	Dec. 31, 2022	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Regulatory asset amortization period							4 years
Less: Accumulated depreciation							$ 40,126		$ 37,725
Utility plant in service
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation							38,900		36,600
Other plant in service
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation							$ 1,200		1,100
Maximum | Other plant in service
Property, Plant and Equipment [Line Items]
Depreciation period of original cost							40 years
Alabama Power
Property, Plant and Equipment [Line Items]
Requested rate increase (decrease), amount					$ 78
Less: Accumulated depreciation							$ 11,741		11,131
Georgia Power
Property, Plant and Equipment [Line Items]
Requested rate increase (decrease), amount						$ 1,100		$ 14,000
Less: Accumulated depreciation							14,806		13,955
Southern Company Gas
Property, Plant and Equipment [Line Items]
Requested rate increase (decrease), amount			$ 53	$ 53
Less: Accumulated depreciation							5,887		5,534
Southern Company Gas | Utility plant in service
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation							5,600		5,300
Southern Company Gas | Other plant in service
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation							$ 252		210
Southern Company Gas | Maximum | Transportation equipment
Property, Plant and Equipment [Line Items]
Depreciation period of original cost							10 years
Southern Company Gas | Maximum | Storage facilities
Property, Plant and Equipment [Line Items]
Depreciation period of original cost							40 years
Southern Company Gas | Maximum | Other assets
Property, Plant and Equipment [Line Items]
Depreciation period of original cost							78 years
Southern Company Gas | Minimum | Transportation equipment
Property, Plant and Equipment [Line Items]
Depreciation period of original cost							5 years
Southern Company Gas | Minimum | Storage facilities
Property, Plant and Equipment [Line Items]
Depreciation period of original cost							5 years
Mississippi Power
Property, Plant and Equipment [Line Items]
Requested rate increase (decrease), amount		$ 11
Less: Accumulated depreciation							$ 1,833		$ 1,792
Mississippi Power | Subsequent Event
Property, Plant and Equipment [Line Items]
Requested rate increase (decrease), amount	$ 8
Mississippi Power | Chevron Products Company [Member]
Property, Plant and Equipment [Line Items]
Net book value of co-generation assets							$ 139
Plant Farley | Alabama Power | Nuclear Outage
Property, Plant and Equipment [Line Items]
Regulatory asset amortization period							18 months
Plant Hatch Units 1 and 2 | Georgia Power | Nuclear Outage | Maximum
Property, Plant and Equipment [Line Items]
Regulatory asset amortization period							24 months
Plant Vogtle Nuclear Units One , Two, and Three | Georgia Power | Nuclear Outage
Property, Plant and Equipment [Line Items]
Regulatory asset amortization period							18 months

PROPERTY, PLANT, AND EQUIPMEN_4

PROPERTY, PLANT, AND EQUIPMENT - Deferred Cloud Implementation Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	$ 19,599	$ 19,069
Deferred Cloud Implementation Costs
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	321	325
Amortization	56	46	$ 29
Alabama Power
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	5,175	5,090
Alabama Power | Deferred Cloud Implementation Costs
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	92	85
Amortization	17	11	8
Georgia Power
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	11,142	10,200
Georgia Power | Deferred Cloud Implementation Costs
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	111	99
Amortization	22	19	12
Mississippi Power
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	841	887
Mississippi Power | Deferred Cloud Implementation Costs
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	13	13
Amortization	0	0	0
Southern Power
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	950	998
Southern Power | Deferred Cloud Implementation Costs
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	12	15
Amortization	0	0	$ 0
Southern Company Gas
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	902	890
Southern Company Gas | Deferred Cloud Implementation Costs
Property, Plant and Equipment [Line Items]
Total deferred charges and other assets	$ 35	$ 43

PROPERTY, PLANT, AND EQUIPMEN_5

PROPERTY, PLANT, AND EQUIPMENT - Composite Straight-Line Rates (Details) - Utility plant in service	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Alabama Power
Property, Plant and Equipment [Line Items]
Composite rate	4.20%	4.10%	2.70%
Georgia Power
Property, Plant and Equipment [Line Items]
Composite rate	3.40%	3.80%	3.30%
Mississippi Power
Property, Plant and Equipment [Line Items]
Composite rate	3.30%	3.40%	3.40%
Southern Company Gas
Property, Plant and Equipment [Line Items]
Composite rate	2.90%	2.70%	2.70%

PROPERTY, PLANT, AND EQUIPMEN_6

PROPERTY, PLANT, AND EQUIPMENT - Southern Power Useful Lives (Details) - Southern Power - Maximum	Dec. 31, 2024
Natural Gas Generating Facility
Property, Plant and Equipment [Line Items]
Useful life	50 years
Solar Generating Facility
Property, Plant and Equipment [Line Items]
Useful life	35 years
Wind Generating Facility
Property, Plant and Equipment [Line Items]
Useful life	35 years

PROPERTY, PLANT, AND EQUIPMEN_7

PROPERTY, PLANT, AND EQUIPMENT - Ownership and Investment in Jointly-Owned Facilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) mi
Alabama Power
Other Ownership Interests [Line Items]
Percent Ownership	14%
Alabama Power | Plant Greene County (natural gas) Units 1 and 2
Other Ownership Interests [Line Items]
Percent Ownership	60%
Plant in Service	$ 192
Accumulated Depreciation	140
CWIP	$ 1
Alabama Power | Plant Miller (coal) Units 1 and 2
Other Ownership Interests [Line Items]
Percent Ownership	91.80%
Plant in Service	$ 2,180
Accumulated Depreciation	829
CWIP	7
Georgia Power | Plant Hatch (nuclear) Units 1 and 2
Other Ownership Interests [Line Items]
Plant in Service	1,464
Accumulated Depreciation	604
CWIP	$ 66
Georgia Power | Plant Vogtle (nuclear) Units 1 and 2
Other Ownership Interests [Line Items]
Percent Ownership	45.70%
Plant in Service	$ 3,621
Accumulated Depreciation	2,342
CWIP	$ 162
Georgia Power | Plant Vogtle (nuclear) Units 3 and 4
Other Ownership Interests [Line Items]
Percent Ownership	45.70%
Plant in Service	$ 7,953
Accumulated Depreciation	119
CWIP	$ 45
Georgia Power | Plant Scherer (coal) Units 1 and 2
Other Ownership Interests [Line Items]
Percent Ownership	8.40%
Plant in Service	$ 289
Accumulated Depreciation	140
CWIP	$ 4
Georgia Power | Plant Scherer (coal) Unit 3
Other Ownership Interests [Line Items]
Percent Ownership	75%
Plant in Service	$ 1,316
Accumulated Depreciation	720
CWIP	$ 22
Georgia Power | Rocky Mountain (pumped storage)
Other Ownership Interests [Line Items]
Percent Ownership	25.40%
Plant in Service	$ 182
Accumulated Depreciation	160
CWIP	$ 6
Mississippi Power | Plant Greene County (natural gas) Units 1 and 2
Other Ownership Interests [Line Items]
Percent Ownership	40%
Plant in Service	$ 125
Accumulated Depreciation	88
CWIP	$ 2
Mississippi Power | Plant Daniel (coal) Units 1 and 2
Other Ownership Interests [Line Items]
Percent Ownership	50%
Plant in Service	$ 791
Accumulated Depreciation	286
CWIP	$ 3
Southern Company Gas | Dalton Pipeline (natural gas pipeline)
Other Ownership Interests [Line Items]
Percent Ownership	50%
Plant in Service	$ 271
Accumulated Depreciation	32
CWIP	$ 1
Pipeline infrastructure (miles) | mi	115
Agreement to lease undivided ownership (percent)	50%
Future minimum payments receivable	$ 26

ASSET RETIREMENT OBLIGATIONS -

ASSET RETIREMENT OBLIGATIONS - Details of AROs Included in the Balance Sheets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of year	$ 10,317	$ 10,840
Liabilities incurred	130	90
Liabilities settled	(566)	(617)
Accretion expense	400	403
Cash flow revisions	(347)	(399)
Balance at end of year	9,934	10,317
Alabama Power
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of year	4,158	4,287
Liabilities incurred	8	0
Liabilities settled	(254)	(270)
Accretion expense	153	156
Cash flow revisions	(7)	(15)
Balance at end of year	4,058	4,158
Georgia Power
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of year	5,665	6,034
Liabilities incurred	120	90
Liabilities settled	(270)	(304)
Accretion expense	232	230
Cash flow revisions	(332)	(385)
Balance at end of year	5,415	5,665
Mississippi Power
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of year	168	179
Liabilities incurred	0	0
Liabilities settled	(17)	(18)
Accretion expense	5	5
Cash flow revisions	(8)	2
Balance at end of year	148	168
Southern Power
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of year	150	144
Liabilities incurred	2	0
Liabilities settled	0	0
Accretion expense	7	6
Cash flow revisions	0	0
Balance at end of year	$ 159	$ 150

ASSET RETIREMENT OBLIGATIONS _2

ASSET RETIREMENT OBLIGATIONS - Narrative (Details) - USD ($)

1 Months Ended

12 Months Ended

May 01, 2024

Aug. 01, 2023

Nov. 30, 2024

Sep. 30, 2024

Nov. 30, 2023

Sep. 30, 2023

Jun. 30, 2023

Dec. 31, 2024

Dec. 31, 2022

Dec. 31, 2019

Feb. 14, 2024

Dec. 31, 2023

Mar. 06, 2023

Jointly Owned Utility Plant Interests [Line Items]

Asset retirement obligations

$ 9,934,000,000

$ 10,840,000,000

$ 10,317,000,000

Plant Vogtle Units 3 and 4

Jointly Owned Utility Plant Interests [Line Items]

Asset retirement obligations

$ 90,000,000

Plant Vogtle Unit 4

Jointly Owned Utility Plant Interests [Line Items]

Asset retirement obligations

$ 118,000,000

Alabama Power

Jointly Owned Utility Plant Interests [Line Items]

Decrease to ARO

$ 15,000,000

Asset retirement obligations

4,058,000,000

4,287,000,000

4,158,000,000

Alabama Power | Internal reserves

Jointly Owned Utility Plant Interests [Line Items]

Accumulated provisions for decommissioning

$ 12,000,000

13,000,000

Alabama Power | Plant Farley

Jointly Owned Utility Plant Interests [Line Items]

Estimated inflation rate

4.50%

Estimated trust earnings rate

7%

Alabama Power | Plant Farley

Jointly Owned Utility Plant Interests [Line Items]

Site-specific estimate of decommissioning costs, period of updates made

5 years

Georgia Power

Jointly Owned Utility Plant Interests [Line Items]

Decrease to ARO

$ 60,000,000

$ 389,000,000

$ 210,000,000

$ 175,000,000

Asset retirement obligations

$ 5,415,000,000

6,034,000,000

5,665,000,000

Georgia Power | Plant Hatch

Jointly Owned Utility Plant Interests [Line Items]

Estimated inflation rate

2.50%

Estimated trust earnings rate

4.50%

Georgia Power | Plant Vogtle Units 3 and 4

Jointly Owned Utility Plant Interests [Line Items]

Estimated inflation rate

2.30%

Estimated trust earnings rate

4.30%

Georgia Power | Plant Hatch and Plant Vogtle Units 1 And 2

Jointly Owned Utility Plant Interests [Line Items]

Annual decommissioning cost for ratemaking

0

$ 4,000,000

Georgia Power | Plant Vogtle Units 3 and 4

Jointly Owned Utility Plant Interests [Line Items]

Annual decommissioning cost for ratemaking

$ 8,000,000

Georgia Power | Plant Vogtle Unit 4

Jointly Owned Utility Plant Interests [Line Items]

Annual decommissioning cost for ratemaking

$ 8,000,000

Mississippi Power

Jointly Owned Utility Plant Interests [Line Items]

Asset retirement obligations

$ 148,000,000

$ 179,000,000

$ 168,000,000

ASSET RETIREMENT OBLIGATIONS _3

ASSET RETIREMENT OBLIGATIONS - Investment Securities in the Funds (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Total investment securities in the Funds	$ 2,621	$ 2,422
Equity securities
Marketable Securities [Line Items]
Total investment securities in the Funds	1,413	1,288
Debt securities
Marketable Securities [Line Items]
Total investment securities in the Funds	976	895
Other securities
Marketable Securities [Line Items]
Total investment securities in the Funds	232	239
Alabama Power
Marketable Securities [Line Items]
Total investment securities in the Funds	1,385	1,259
Alabama Power | Equity securities
Marketable Securities [Line Items]
Total investment securities in the Funds	848	796
Alabama Power | Debt securities
Marketable Securities [Line Items]
Total investment securities in the Funds	335	277
Alabama Power | Other securities
Marketable Securities [Line Items]
Total investment securities in the Funds	202	186
Georgia Power
Marketable Securities [Line Items]
Total investment securities in the Funds	1,236	1,163
Georgia Power | Equity securities
Marketable Securities [Line Items]
Total investment securities in the Funds	565	492
Georgia Power | Debt securities
Marketable Securities [Line Items]
Total investment securities in the Funds	641	618
Georgia Power | Other securities
Marketable Securities [Line Items]
Total investment securities in the Funds	$ 30	$ 53

ASSET RETIREMENT OBLIGATIONS _4

ASSET RETIREMENT OBLIGATIONS - Fair Value Increases (Decreases) of the Funds (Details) - Securities held in the Funds - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair value increases (decreases)
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Fair value increases (decreases) of the Funds	$ 229	$ 281	$ (360)
Unrealized gains (losses)
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Fair value increases (decreases) of the Funds	113	241	(391)
Alabama Power | Fair value increases (decreases)
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Fair value increases (decreases) of the Funds	143	157	(171)
Alabama Power | Unrealized gains (losses)
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Fair value increases (decreases) of the Funds	64	119	(204)
Georgia Power | Fair value increases (decreases)
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Fair value increases (decreases) of the Funds	86	124	(189)
Georgia Power | Unrealized gains (losses)
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Fair value increases (decreases) of the Funds	$ 49	$ 122	$ (187)

ASSET RETIREMENT OBLIGATIONS _5

ASSET RETIREMENT OBLIGATIONS - Accumulated Provisions for the External Decommissioning Trust Funds (Details) - External decommissioning trust funds - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Georgia Power
Public Utilities, General Disclosures [Line Items]
Accumulated provisions for decommissioning	$ 1,236	$ 1,163
Plant Farley | Alabama Power
Public Utilities, General Disclosures [Line Items]
Accumulated provisions for decommissioning	1,385	1,259
Plant Hatch | Georgia Power
Public Utilities, General Disclosures [Line Items]
Accumulated provisions for decommissioning	735	705
Plant Vogtle Units 1 and 2 | Georgia Power
Public Utilities, General Disclosures [Line Items]
Accumulated provisions for decommissioning	460	434
Plant Vogtle Units 3 and 4 | Georgia Power
Public Utilities, General Disclosures [Line Items]
Accumulated provisions for decommissioning	$ 41	$ 24

ASSET RETIREMENT OBLIGATIONS _6

ASSET RETIREMENT OBLIGATIONS - Estimated Costs of Decommissioning (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Alabama Power | Plant Farley
Public Utilities, General Disclosures [Line Items]
Decommissioning periods: Beginning year	2037
Decommissioning periods: Completion year	2087
Site study costs	$ 2,048
Alabama Power | Radiated structures | Plant Farley
Public Utilities, General Disclosures [Line Items]
Site study costs	1,402
Alabama Power | Spent fuel management | Plant Farley
Public Utilities, General Disclosures [Line Items]
Site study costs	513
Alabama Power | Non-radiated structures | Plant Farley
Public Utilities, General Disclosures [Line Items]
Site study costs	$ 133
Georgia Power | Plant Hatch
Public Utilities, General Disclosures [Line Items]
Decommissioning periods: Beginning year	2034
Decommissioning periods: Completion year	2088
Site study costs	$ 1,178
Georgia Power | Plant Vogtle Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Decommissioning periods: Beginning year	2047
Decommissioning periods: Completion year	2092
Site study costs	$ 1,036
Georgia Power | Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Decommissioning periods: Beginning year	2062
Decommissioning periods: Completion year	2074
Site study costs	$ 776
Georgia Power | Radiated structures | Plant Hatch
Public Utilities, General Disclosures [Line Items]
Site study costs	795
Georgia Power | Radiated structures | Plant Vogtle Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Site study costs	674
Georgia Power | Radiated structures | Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Site study costs	599
Georgia Power | Spent fuel management | Plant Hatch
Public Utilities, General Disclosures [Line Items]
Site study costs	306
Georgia Power | Spent fuel management | Plant Vogtle Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Site study costs	255
Georgia Power | Spent fuel management | Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Site study costs	88
Georgia Power | Non-radiated structures | Plant Hatch
Public Utilities, General Disclosures [Line Items]
Site study costs	77
Georgia Power | Non-radiated structures | Plant Vogtle Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Site study costs	107
Georgia Power | Non-radiated structures | Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Site study costs	$ 89

CONSOLIDATED ENTITIES AND EQU_3

CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Southern Company (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity investments in unconsolidated subsidiaries	$ 1,416	$ 1,368
Southern Holdings Company
Schedule of Equity Method Investments [Line Items]
Equity investments in unconsolidated subsidiaries	$ 128	$ 126

CONSOLIDATED ENTITIES AND EQU_4

CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - SEGCO Equity Method Investments Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) MW	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Alabama Power
Jointly Owned Utility Plant Interests [Line Items]
Percent ownership	14%
Alabama Power | SEGCO
Jointly Owned Utility Plant Interests [Line Items]
Ownership percentage, equity method investment	50%
Alabama Power | SEGCO
Jointly Owned Utility Plant Interests [Line Items]
Total megawatt capacity (in MWs) | MW	1,020
Share of purchased power	$ 115	$ 112	$ 124
Dividends paid by equity method investment	$ 20	25	14
Georgia Power | SEGCO
Jointly Owned Utility Plant Interests [Line Items]
Ownership percentage, equity method investment	50%
Georgia Power | SEGCO
Jointly Owned Utility Plant Interests [Line Items]
Share of purchased power	$ 118	$ 115	$ 127
SEGCO | Alabama Power
Jointly Owned Utility Plant Interests [Line Items]
Percent ownership	86%

CONSOLIDATED ENTITIES AND EQU_5

CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) investor	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Redeemable Noncontrolling Interest [Line Items]
Total assets	$ 145,180	$ 139,331	$ 134,891
Liabilities	108,506	104,106
Equity investments in unconsolidated subsidiaries	1,416	1,368
Earnings from equity method investments	139	144	151
Southern Power
Redeemable Noncontrolling Interest [Line Items]
Total assets	12,653	12,761
Liabilities	5,971	6,063
Proceeds from sale of equity method investments	$ 50	38
Southern Power | SP Solar Holdings I, LP
Redeemable Noncontrolling Interest [Line Items]
Sale of equity interest in limited partnership	33%
Southern Company Gas
Redeemable Noncontrolling Interest [Line Items]
Total assets	$ 26,177	25,083	24,621
Liabilities	15,181	14,280
Equity investments in unconsolidated subsidiaries	1,279	1,235
Earnings from equity method investments	146	140	148
Southern Company Gas | SNG
Redeemable Noncontrolling Interest [Line Items]
Equity investments in unconsolidated subsidiaries	1,245	1,202
Earnings from equity method investments	$ 146	139	$ 146
Wholly Owned Subsidiary Of Southern Power | Southern Power | SP Solar Holdings I, LP
Redeemable Noncontrolling Interest [Line Items]
Ownership interest	66%
Wholly Owned Subsidiary Of Southern Power | Southern Power | SP Wind
Redeemable Noncontrolling Interest [Line Items]
Ownership interest	100%
SP Solar Holdings I, LP | Southern Power
Redeemable Noncontrolling Interest [Line Items]
Distribution made to limited partner, cash distributions paid, percentage	67%
SP Solar Holdings I, LP | Global Atlantic
Redeemable Noncontrolling Interest [Line Items]
Distribution made to limited partner, cash distributions paid, percentage	33%
SP Wind | Southern Power
Redeemable Noncontrolling Interest [Line Items]
Distribution made to limited partner, cash distributions paid, percentage	60%
Number of financial investors | investor	3
SP Wind | Financial Investors
Redeemable Noncontrolling Interest [Line Items]
Distribution made to limited partner, cash distributions paid, percentage	40%
General Partner | Wholly Owned Subsidiary Of Southern Power | Southern Power | SP Solar Holdings I, LP
Redeemable Noncontrolling Interest [Line Items]
Ownership interest	1%
Variable Interest Entity, Primary Beneficiary | SP Solar Holdings I, LP | Southern Power
Redeemable Noncontrolling Interest [Line Items]
Total assets	$ 5,400	5,600
Liabilities	372	399
Noncontrolling interests related to other partners' interest	1,000
Variable Interest Entity, Primary Beneficiary | SP Wind | Southern Power
Redeemable Noncontrolling Interest [Line Items]
Total assets	2,000	2,100
Liabilities	177	187
Noncontrolling interests related to other partners' interest	35	38
Variable Interest Entity, Primary Beneficiary | Other Variable Interest Entities | Southern Power
Redeemable Noncontrolling Interest [Line Items]
Total assets	1,600	1,700
Liabilities	224	230
Noncontrolling interests related to other partners' interest	$ 691	$ 761

CONSOLIDATED ENTITIES AND EQU_6

CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity investments in unconsolidated subsidiaries	$ 1,416	$ 1,368
Southern Company Gas
Schedule of Equity Method Investments [Line Items]
Equity investments in unconsolidated subsidiaries	1,279	1,235
SNG | Southern Company Gas
Schedule of Equity Method Investments [Line Items]
Equity investments in unconsolidated subsidiaries	1,245	1,202
Other | Southern Company Gas
Schedule of Equity Method Investments [Line Items]
Equity investments in unconsolidated subsidiaries	$ 34	$ 33

FINANCING - Long-Term Debt (Det

FINANCING - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Finance lease obligations	$ 287	$ 298
Unamortized fair value adjustment	275	302
Unamortized debt premium (discount), net	(58)	(198)
Unamortized debt issuance expense	(419)	(290)
Total long-term debt	63,486	59,686
Less: Amount due within one year	4,718	2,476
Long-Term Debt	$ 58,768	57,210
Senior notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.33%
Long-term debt, gross	$ 44,862	40,235
Junior subordinated notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.32%
Long-term debt, gross	$ 7,389	8,333
FFB loans
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.88%
Long-term debt, gross	$ 4,703	4,788
Pollution control revenue bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.15%
Long-term debt, gross	$ 3,379	3,400
First mortgage bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.79%
Long-term debt, gross	$ 2,775	2,500
Medium-term notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	7.03%
Long-term debt, gross	$ 84	84
Other long-term debt
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.96%
Long-term debt, gross	$ 209	234
Alabama Power
Debt Instrument [Line Items]
Finance lease obligations	4	5
Unamortized debt premium (discount), net	(19)	(20)
Unamortized debt issuance expense	(67)	(73)
Total long-term debt	11,154	11,183
Less: Amount due within one year	655	223
Long-Term Debt	$ 10,499	10,960
Alabama Power | Senior notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.94%
Long-term debt, gross	$ 9,875	9,875
Alabama Power | Pollution control revenue bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.11%
Long-term debt, gross	$ 1,300	1,321
Alabama Power | Other long-term debt
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.11%
Long-term debt, gross	$ 61	75
Georgia Power
Debt Instrument [Line Items]
Finance lease obligations	261	240
Unamortized debt premium (discount), net	(21)	(19)
Unamortized debt issuance expense	(123)	(122)
Total long-term debt	18,350	16,700
Less: Amount due within one year	966	502
Long-Term Debt	$ 17,384	16,198
Georgia Power | Senior notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.49%
Long-term debt, gross	$ 11,292	9,575
Georgia Power | Junior subordinated notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	5%
Long-term debt, gross	$ 270	270
Georgia Power | FFB loans
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.88%
Long-term debt, gross	$ 4,703	4,788
Georgia Power | Pollution control revenue bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.18%
Long-term debt, gross	$ 1,968	1,968
Mississippi Power
Debt Instrument [Line Items]
Finance lease obligations	14	16
Unamortized debt premium (discount), net	2	1
Unamortized debt issuance expense	(9)	(9)
Total long-term debt	1,693	1,644
Less: Amount due within one year	12	201
Long-Term Debt	$ 1,681	1,443
Mississippi Power | Senior notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.33%
Long-term debt, gross	$ 1,575	1,525
Mississippi Power | Pollution control revenue bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.16%
Long-term debt, gross	$ 111	111
Southern Power
Debt Instrument [Line Items]
Finance lease obligations	0	0
Unamortized debt premium (discount), net	(4)	(4)
Unamortized debt issuance expense	(11)	(13)
Total long-term debt	2,680	2,711
Less: Amount due within one year	500	0
Long-Term Debt	2,180	2,711
Fair value gain (loss)	$ (45)	(12)
Southern Power | Senior notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.05%
Long-term debt, gross	$ 2,695	2,728
Southern Company Gas
Debt Instrument [Line Items]
Finance lease obligations	0	0
Unamortized fair value adjustment	275	302
Unamortized debt premium (discount), net	(9)	(8)
Unamortized debt issuance expense	(37)	(34)
Total long-term debt	8,531	7,833
Less: Amount due within one year	302	0
Long-Term Debt	$ 8,229	7,833
Southern Company Gas | Senior notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.41%
Long-term debt, gross	$ 5,375	4,930
Southern Company Gas | First mortgage bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.79%
Long-term debt, gross	$ 2,775	2,500
Southern Company Gas | Medium-term notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	7.03%
Long-term debt, gross	$ 84	84
Southern Company Gas | Other long-term debt
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.81%
Long-term debt, gross	$ 68	$ 59

FINANCING - Maturities of Long-

FINANCING - Maturities of Long-Term Debt (Details) $ in Millions	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
2025	$ 4,727
2026	3,792
2027	4,075
2028	2,827
2029	1,990
Alabama Power
Debt Instrument [Line Items]
2025	658
2026	47
2027	551
2028	107
2029	0
Alabama Power | Series 2023A Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
2025	200
Georgia Power
Debt Instrument [Line Items]
2025	967
2026	451
2027	1,015
2028	868
2029	861
Georgia Power | Series 2023C Convertible Senior Notes Due 2074
Debt Instrument [Line Items]
2025	117
Mississippi Power
Debt Instrument [Line Items]
2025	12
2026	66
2027	10
2028	357
2029	1
Southern Power
Debt Instrument [Line Items]
2025	500
2026	964
2027	0
2028	0
2029	0
Southern Power | Euro-denominated Debt
Debt Instrument [Line Items]
2026	564
Southern Company Gas
Debt Instrument [Line Items]
2025	300
2026	530
2027	154
2028	150
2029	$ 150

FINANCING - DOE Loan Guarantee

FINANCING - DOE Loan Guarantee Borrowings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2019	Dec. 31, 2021
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 7,891,000,000
Line of credit facility, maximum borrowing capacity	7,920,000,000
Georgia Power
Debt Instrument [Line Items]
Remaining borrowing capacity	2,026,000,000
Principal amortization payments	86,000,000	$ 86,000,000	$ 88,000,000
Line of credit facility, maximum borrowing capacity	$ 2,050,000,000
Basis spread on variable rate	0.375%
Amortization period	5 years
FFB Credit Facility | Georgia Power
Debt Instrument [Line Items]
Eligible project costs to be reimbursed				$ 5,130,000,000
Remaining borrowing capacity					$ 0
Principal amortization payments	$ 86,000,000
Line of credit facility, maximum borrowing capacity	$ 4,700,000,000	$ 4,800,000,000

FINANCING - Equity Units (Detai

FINANCING - Equity Units (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		2 Months Ended	12 Months Ended
	Aug. 01, 2022	Dec. 31, 2024	Aug. 31, 2022	Feb. 19, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	May 31, 2022
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares)		436,614
Proceeds from issuance of common stock					$ 143	$ 36	$ 1,808
Stock forward price (in dollars per share)					$ 83.3293
Private Placement
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares)		143,920
Subsequent Event
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares)				292,694
Series 2019A Remarketable Junior Subordinated Notes | Junior subordinated notes
Debt Instrument [Line Items]
Remarketed principal amount								$ 862.5
Quarterly interest rate								4.475%
Series 2019B Remarketable Junior Subordinated Notes | Junior subordinated notes
Debt Instrument [Line Items]
Remarketed principal amount								$ 862.5
Quarterly interest rate								5.113%
2019 Series A Equity Units | Junior subordinated notes
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares)			25,200,000
Proceeds from issuance of common stock	$ 1,725

FINANCING - Convertible Senior

FINANCING - Convertible Senior Notes (Details) $ / shares in Units, $ in Millions	1 Months Ended			2 Months Ended	12 Months Ended
	Dec. 31, 2024 $ / shares shares	Nov. 30, 2024 $ / shares shares	May 31, 2024 USD ($) shares	Feb. 19, 2025 shares	Dec. 31, 2024 d $ / shares	Mar. 31, 2023 USD ($)	Feb. 28, 2023 USD ($)
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares) | shares	436,614
Stock forward price (in dollars per share) | $ / shares					$ 83.3293
Subsequent Event
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares) | shares				292,694
At-The-Market
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares) | shares			50,000,000
At-The-Market, Forward Price 1
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares) | shares		1,000,000
Stock forward price (in dollars per share) | $ / shares		$ 86.5645
At-The-Market, Forward Price 2
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares) | shares		1,000,000
Stock forward price (in dollars per share) | $ / shares		$ 87.9658
Private Placement
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares) | shares	143,920
Series 2024A Convertible Senior Notes | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, face amount | $			$ 1,500
Quarterly interest rate			4.50%
Conversion price (in dollars per share) | $ / shares	$ 92.45				$ 92.45
Redemption price (percentage)					100%
Series 2024A Convertible Senior Notes | Convertible Debt | Debt Conversion Terms One
Debt Instrument [Line Items]
Trading days of debt instrument					20
Consecutive trading days					30
Percentage of stock price trigger					130%
Series 2024A Convertible Senior Notes | Convertible Debt | Debt Conversion Terms Two
Debt Instrument [Line Items]
Trading days of debt instrument					5
Percentage of stock price trigger					98%
Series 2023A Convertible Senior Notes Due 2025 | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, face amount | $						$ 225	$ 1,500
Quarterly interest rate							3.875%
Conversion price (in dollars per share) | $ / shares	$ 84.16				$ 84.16
Redemption price (percentage)					100%
Series 2023A Convertible Senior Notes Due 2025 | Convertible Debt | Debt Conversion Terms One
Debt Instrument [Line Items]
Trading days of debt instrument					20
Consecutive trading days					30
Percentage of stock price trigger					130%
Series 2023A Convertible Senior Notes Due 2025 | Convertible Debt | Debt Conversion Terms Two
Debt Instrument [Line Items]
Trading days of debt instrument					5
Consecutive trading days					10
Percentage of stock price trigger					98%

FINANCING - Bank Credit Arrange

FINANCING - Bank Credit Arrangements (Details) $ in Millions	Dec. 31, 2024 USD ($)
Line of Credit Facility [Line Items]
2025	$ 580
2026	665
2027	275
2029	6,400
Total	7,920
Unused	7,891
Expires within One Year	580
Southern Company
Line of Credit Facility [Line Items]
2025	150
2026	0
2027	0
2029	1,850
Total	2,000
Unused	1,998
Expires within One Year	150
Alabama Power
Line of Credit Facility [Line Items]
2025	0
2026	665
2027	0
2029	700
Total	1,365
Unused	1,364
Expires within One Year	0
Georgia Power
Line of Credit Facility [Line Items]
2025	300
2026	0
2027	0
2029	1,750
Total	2,050
Unused	2,026
Expires within One Year	300
Mississippi Power
Line of Credit Facility [Line Items]
2025	0
2026	0
2027	275
2029	0
Total	275
Unused	275
Expires within One Year	0
Southern Power
Line of Credit Facility [Line Items]
2025	0
2026	0
2027	0
2029	600
Total	600
Unused	600
Expires within One Year	0
Southern Power | Continuing Letter of Credit Facility A
Line of Credit Facility [Line Items]
2025	100
2026	75
Unused	16
Southern Power | Continuing Letter of Credit Facility B
Line of Credit Facility [Line Items]
Unused	11
Southern Company Gas
Line of Credit Facility [Line Items]
2025	100
2026	0
2027	0
2029	1,500
Total	1,600
Unused	1,598
Expires within One Year	100
Other Subsidiaries
Line of Credit Facility [Line Items]
2025	30
2026	0
2027	0
2029	0
Total	30
Unused	30
Expires within One Year	30
Southern Company and Southern Power
Line of Credit Facility [Line Items]
2029	2,450
Southern Company Gas Capital
Line of Credit Facility [Line Items]
Total	800
Nicor Gas
Line of Credit Facility [Line Items]
2025	100
Total	700
Alabama Property Company
Line of Credit Facility [Line Items]
2026	15
Unused	$ 14

FINANCING - Bank Credit Arran_2

FINANCING - Bank Credit Arrangements Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Ratio of indebtedness to capitalization, debt covenant, required	70%
Amount of variable rate pollution control revenue bonds outstanding requiring liquidity support	$ 1,700
Other Subsidiaries
Line of Credit Facility [Line Items]
Ratio of indebtedness to capitalization, debt covenant, required	65%
Alabama Power
Line of Credit Facility [Line Items]
Amount of variable rate pollution control revenue bonds outstanding requiring liquidity support	$ 796
Remarketed pollution control bonds	207
Georgia Power
Line of Credit Facility [Line Items]
Amount of variable rate pollution control revenue bonds outstanding requiring liquidity support	819
Remarketed pollution control bonds	157
Mississippi Power
Line of Credit Facility [Line Items]
Amount of variable rate pollution control revenue bonds outstanding requiring liquidity support	69
Southern Power | Power Purchase Agreement
Line of Credit Facility [Line Items]
Debt instrument, collateral amount	$ 106	$ 106

FINANCING - Notes Payable (Deta

FINANCING - Notes Payable (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Short-term Debt [Line Items]
Amount Outstanding	$ 1,338	$ 2,314
Weighted Average Interest Rate	4.80%	5.70%
Commercial paper
Short-term Debt [Line Items]
Amount Outstanding	$ 1,138	$ 1,794
Weighted Average Interest Rate	4.70%	5.60%
Short-term bank debt
Short-term Debt [Line Items]
Amount Outstanding	$ 200	$ 520
Weighted Average Interest Rate	5.30%	6.40%
Alabama Power
Short-term Debt [Line Items]
Amount Outstanding	$ 0	$ 40
Alabama Power | Commercial paper
Short-term Debt [Line Items]
Amount Outstanding	$ 0	$ 40
Weighted Average Interest Rate	0%	5.50%
Georgia Power
Short-term Debt [Line Items]
Amount Outstanding	$ 200	$ 1,329
Weighted Average Interest Rate	5.30%	5.90%
Georgia Power | Commercial paper
Short-term Debt [Line Items]
Amount Outstanding	$ 0	$ 809
Weighted Average Interest Rate	0%	5.60%
Georgia Power | Short-term bank debt
Short-term Debt [Line Items]
Amount Outstanding	$ 200	$ 520
Weighted Average Interest Rate	5.30%	6.40%
Southern Power
Short-term Debt [Line Items]
Amount Outstanding	$ 0	$ 138
Southern Power | Commercial paper
Short-term Debt [Line Items]
Amount Outstanding	$ 0	$ 138
Weighted Average Interest Rate	0%	5.50%
Southern Company Gas
Short-term Debt [Line Items]
Amount Outstanding	$ 455	$ 415
Southern Company Gas | Commercial paper
Short-term Debt [Line Items]
Amount Outstanding	$ 455	$ 415
Weighted Average Interest Rate	4.70%	5.50%
Southern Company Gas Capital | Commercial paper
Short-term Debt [Line Items]
Amount Outstanding	$ 283	$ 23
Weighted Average Interest Rate	4.70%	5.50%
Nicor Gas | Commercial paper
Short-term Debt [Line Items]
Amount Outstanding	$ 172	$ 392
Weighted Average Interest Rate	4.60%	5.50%
Mississippi Power
Short-term Debt [Line Items]
Amount Outstanding	$ 14	$ 0
Mississippi Power | Commercial paper
Short-term Debt [Line Items]
Amount Outstanding	$ 14	$ 0
Weighted Average Interest Rate	4.60%	0%

FINANCING - Outstanding Classes

FINANCING - Outstanding Classes of Capital Stock Narrative (Details) shares in Millions	12 Months Ended
	Dec. 31, 2024 shares
Debt Instrument [Line Items]
Stock issued employee and director stock plans (in shares)	5.8
Number of shares reserved for issuance to stock-based compensation plan (in shares)	177
Southern Company Common Stock
Debt Instrument [Line Items]
Remaining shares available for awards (in shares)	25

FINANCING - Diluted Earnings Pe

FINANCING - Diluted Earnings Per Share (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
As reported shares (in shares)	1,096	1,092	1,075
Effect of stock-based compensation (in shares)	6	6	6
Diluted shares (in shares)	1,102	1,098	1,081

FINANCING - Preferred Stock Red

FINANCING - Preferred Stock Redemption (Details) - Alabama Power	12 Months Ended
	Dec. 31, 2022 $ / shares shares
4.92% Preferred Stock
Debt Instrument, Redemption [Line Items]
Dividend rate percentage	0.0492
Par Value/Stated Capital Per Share (in dollars per share)	$ 100
Shares outstanding (in shares) | shares	80,000
Redemption Price Per Share (in dollars per share)	$ 103.23
4.72% Preferred Stock
Debt Instrument, Redemption [Line Items]
Dividend rate percentage	0.0472
Par Value/Stated Capital Per Share (in dollars per share)	$ 100
Shares outstanding (in shares) | shares	50,000
Redemption Price Per Share (in dollars per share)	$ 102.18
4.64% Preferred Stock
Debt Instrument, Redemption [Line Items]
Dividend rate percentage	0.0464
Par Value/Stated Capital Per Share (in dollars per share)	$ 100
Shares outstanding (in shares) | shares	60,000
Redemption Price Per Share (in dollars per share)	$ 103.14
4.60% Preferred Stock
Debt Instrument, Redemption [Line Items]
Dividend rate percentage	0.0460
Par Value/Stated Capital Per Share (in dollars per share)	$ 100
Shares outstanding (in shares) | shares	100,000
Redemption Price Per Share (in dollars per share)	$ 104.20
4.52% Preferred Stock
Debt Instrument, Redemption [Line Items]
Dividend rate percentage	0.0452
Par Value/Stated Capital Per Share (in dollars per share)	$ 100
Shares outstanding (in shares) | shares	50,000
Redemption Price Per Share (in dollars per share)	$ 102.93
4.20% Preferred Stock
Debt Instrument, Redemption [Line Items]
Dividend rate percentage	0.0420
Par Value/Stated Capital Per Share (in dollars per share)	$ 100
Shares outstanding (in shares) | shares	135,115
Redemption Price Per Share (in dollars per share)	$ 105
5.00% Class A Preferred Stock
Debt Instrument, Redemption [Line Items]
Dividend rate percentage	0.0500
Par Value/Stated Capital Per Share (in dollars per share)	$ 25
Shares outstanding (in shares) | shares	10,000,000
Redemption Price Per Share (in dollars per share)	$ 25

FINANCING - Dividend Restrictio

FINANCING - Dividend Restrictions and Structural Considerations Narrative (Details) $ in Billions	12 Months Ended
	Dec. 31, 2024 USD ($)
Variable Interest Entity [Line Items]
Undistributed retained earnings of subsidiaries	$ 6.5
Southern Company Gas
Variable Interest Entity [Line Items]
Retained earnings, unappropriated	$ 1.6

LEASES - Major Categories of Le

LEASES - Major Categories of Lease Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Lease obligations	$ 1,740	$ 1,788
Alabama Power
Lessee, Lease, Description [Line Items]
Lease obligations	94	98
Georgia Power
Lessee, Lease, Description [Line Items]
Lease obligations	1,589	1,115
Mississippi Power
Lessee, Lease, Description [Line Items]
Lease obligations	22	25
Southern Power
Lessee, Lease, Description [Line Items]
Lease obligations	540	546
Southern Company Gas
Lessee, Lease, Description [Line Items]
Lease obligations	41	51
Electric generating units(*)
Lessee, Lease, Description [Line Items]
Lease obligations	672	670
Electric generating units(*) | Alabama Power
Lessee, Lease, Description [Line Items]
Lease obligations	56	58
Electric generating units(*) | Georgia Power
Lessee, Lease, Description [Line Items]
Lease obligations	1,509	1,028
Electric generating units(*) | Mississippi Power
Lessee, Lease, Description [Line Items]
Lease obligations	0	0
Electric generating units(*) | Southern Power
Lessee, Lease, Description [Line Items]
Lease obligations	0	0
Electric generating units(*) | Southern Company Gas
Lessee, Lease, Description [Line Items]
Lease obligations	0	0
Real estate/land
Lessee, Lease, Description [Line Items]
Lease obligations	834	871
Real estate/land | Alabama Power
Lessee, Lease, Description [Line Items]
Lease obligations	3	4
Real estate/land | Georgia Power
Lessee, Lease, Description [Line Items]
Lease obligations	45	54
Real estate/land | Mississippi Power
Lessee, Lease, Description [Line Items]
Lease obligations	2	2
Real estate/land | Southern Power
Lessee, Lease, Description [Line Items]
Lease obligations	540	546
Real estate/land | Southern Company Gas
Lessee, Lease, Description [Line Items]
Lease obligations	20	28
Communication towers
Lessee, Lease, Description [Line Items]
Lease obligations	118	123
Communication towers | Alabama Power
Lessee, Lease, Description [Line Items]
Lease obligations	2	1
Communication towers | Georgia Power
Lessee, Lease, Description [Line Items]
Lease obligations	4	4
Communication towers | Mississippi Power
Lessee, Lease, Description [Line Items]
Lease obligations	0	0
Communication towers | Southern Power
Lessee, Lease, Description [Line Items]
Lease obligations	0	0
Communication towers | Southern Company Gas
Lessee, Lease, Description [Line Items]
Lease obligations	21	23
Railcars
Lessee, Lease, Description [Line Items]
Lease obligations	64	64
Railcars | Alabama Power
Lessee, Lease, Description [Line Items]
Lease obligations	31	32
Railcars | Georgia Power
Lessee, Lease, Description [Line Items]
Lease obligations	29	27
Railcars | Mississippi Power
Lessee, Lease, Description [Line Items]
Lease obligations	4	5
Railcars | Southern Power
Lessee, Lease, Description [Line Items]
Lease obligations	0	0
Railcars | Southern Company Gas
Lessee, Lease, Description [Line Items]
Lease obligations	0	0
Other
Lessee, Lease, Description [Line Items]
Lease obligations	52	60
Other | Alabama Power
Lessee, Lease, Description [Line Items]
Lease obligations	2	3
Other | Georgia Power
Lessee, Lease, Description [Line Items]
Lease obligations	2	2
Other | Mississippi Power
Lessee, Lease, Description [Line Items]
Lease obligations	16	18
Other | Southern Power
Lessee, Lease, Description [Line Items]
Lease obligations	0	0
Other | Southern Company Gas
Lessee, Lease, Description [Line Items]
Lease obligations	$ 0	$ 0

LEASES - Additional Information

LEASES - Additional Information (Details) $ in Millions			12 Months Ended
	Dec. 31, 2024 USD ($) agreement	Jun. 27, 2024 agreement	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease obligations	$ 1,453		$ 1,453	$ 1,490
Maximum | Real estate
Lessee, Lease, Description [Line Items]
Remaining terms			20 years
Maximum | Land
Lessee, Lease, Description [Line Items]
Lessee, lease term			44 years
Maximum | Communication towers
Lessee, Lease, Description [Line Items]
Lessee, lease term			16 years
Maximum | Fuel cells
Lessee, Lease, Description [Line Items]
Lessor, lease term, operating lease	9 years		9 years
Alabama Power
Lessee, Lease, Description [Line Items]
Operating lease obligations	$ 90		$ 90	93
Alabama Power | Maximum | Electric generating units
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term	15 years		15 years
Alabama Power | Minimum | Electric generating units
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term	3 years		3 years
Georgia Power
Lessee, Lease, Description [Line Items]
Requested number of affiliate power purchase agreements to be certified | agreement	2	5
Lease not yet commenced, term	10 years		10 years
Lease not yet commenced amount	$ 83		$ 83
Operating lease obligations	$ 1,328		1,328	875
Variable lease, payment			45	42	$ 45
Georgia Power | Purchased power, affiliates
Lessee, Lease, Description [Line Items]
Variable lease, payment			$ 22	21	$ 21
Georgia Power | Maximum | Outdoor lighting
Lessee, Lease, Description [Line Items]
Lessor, lease term, operating lease	15 years		15 years
Mississippi Power
Lessee, Lease, Description [Line Items]
Operating lease obligations	$ 8		$ 8	9
Mississippi Power | Maximum | Electric generating units
Lessee, Lease, Description [Line Items]
Lessor, sales-type lease, term of contract	14 years		14 years
Southern Power
Lessee, Lease, Description [Line Items]
Operating lease obligations	$ 540		$ 540	546
Southern Power | Maximum | Electric generating units
Lessee, Lease, Description [Line Items]
Lessor, lease term, operating lease	22 years		22 years
Lessor, sales-type lease, term of contract	17 years		17 years
Southern Company Gas
Lessee, Lease, Description [Line Items]
Lease not yet commenced, term	11 years 6 months		11 years 6 months
Lease not yet commenced amount	$ 105		$ 105
Operating lease obligations	41		$ 41	51
Southern Company Gas | Maximum
Lessee, Lease, Description [Line Items]
Lessor, remaining term			18 years
Affiliate | Georgia Power | Electric generating units
Lessee, Lease, Description [Line Items]
Operating lease obligations	$ 893		$ 893	$ 416
Traditional Electric Operating Companies | Maximum | Outdoor lighting
Lessee, Lease, Description [Line Items]
Lessor, lease term, operating lease	10 years		10 years

LEASES - Balance Sheet Amounts

LEASES - Balance Sheet Amounts Recorded for Operating and Financing Leases (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Operating Leases
Operating lease ROU assets, net	$ 1,386	$ 1,432
Operating lease obligations - current	200	183
Operating lease obligations - non-current	1,253	1,307
Total operating lease obligations	$ 1,453	$ 1,490
Finance Leases
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service	Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service
Finance lease ROU assets, net	$ 254	$ 272
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Finance lease obligations - current	$ 9	$ 11
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-Term Debt	Long-Term Debt
Finance lease obligations - non-current	$ 278	$ 287
Total finance lease obligations	287	298
Assets Subject to Power Purchase Agreement
Operating Leases
Total operating lease obligations	567	566
Alabama Power
Operating Leases
Operating lease ROU assets, net	$ 84	$ 87
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Operating lease obligations - current	$ 14	$ 12
Operating lease obligations - non-current	76	81
Total operating lease obligations	$ 90	$ 93
Finance Leases
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service	Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service
Finance lease ROU assets, net	$ 4	$ 5
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Finance lease obligations - current	$ 1	$ 2
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-Term Debt	Long-Term Debt
Finance lease obligations - non-current	$ 3	$ 3
Total finance lease obligations	4	5
Alabama Power | Assets Subject to Power Purchase Agreement
Operating Leases
Total operating lease obligations	55	58
Georgia Power
Operating Leases
Operating lease ROU assets, net	1,331	884
Operating lease obligations - current	169	135
Operating lease obligations - non-current	1,159	740
Total operating lease obligations	$ 1,328	$ 875
Finance Leases
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service	Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service
Finance lease ROU assets, net	$ 227	$ 203
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Finance lease obligations - current	$ 20	$ 18
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-Term Debt	Long-Term Debt
Finance lease obligations - non-current	$ 241	$ 222
Total finance lease obligations	261	240
Georgia Power | Assets Subject to Power Purchase Agreement
Operating Leases
Total operating lease obligations	$ 1,300	$ 813
Mississippi Power
Operating Leases
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other deferred charges and assets	Other deferred charges and assets
Operating lease ROU assets, net	$ 8	$ 9
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Operating lease obligations - current	$ 4	$ 3
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Operating lease obligations - non-current	$ 4	$ 6
Total operating lease obligations	$ 8	$ 9
Finance Leases
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service	Public Utilities, Other Depreciable Property, Plant And Equipment, Plant In Service
Finance lease ROU assets, net	$ 14	$ 15
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Finance lease obligations - current	$ 1	$ 1
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-Term Debt	Long-Term Debt
Finance lease obligations - non-current	$ 13	$ 15
Total finance lease obligations	14	16
Southern Power
Operating Leases
Operating lease ROU assets, net	$ 484	$ 488
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Operating lease obligations - current	$ 29	$ 29
Operating lease obligations - non-current	511	517
Total operating lease obligations	540	546
Finance Leases
Finance lease ROU assets, net	0	0
Finance lease obligations - current	0	0
Finance lease obligations - non-current	0	0
Total finance lease obligations	0	0
Southern Company Gas
Operating Leases
Operating lease ROU assets, net	$ 38	$ 47
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Operating lease obligations - current	$ 11	$ 11
Operating lease obligations - non-current	30	40
Total operating lease obligations	41	51
Finance Leases
Finance lease ROU assets, net	0	0
Finance lease obligations - current	0	0
Finance lease obligations - non-current	0	0
Total finance lease obligations	$ 0	$ 0

LEASES - Lease Costs (Details)

LEASES - Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lease cost
Operating lease cost	$ 248	$ 252	$ 297
Finance lease cost:
Amortization of ROU assets	20	24	23
Interest on lease obligations	15	14	13
Total finance lease cost	35	38	36
Short-term lease costs	37	40	64
Variable lease cost	48	47	125
Sublease income			(1)
Total lease cost	368	377	521
Assets Subject to Power Purchase Agreement
Lease cost
Operating lease cost	108	112	162
Alabama Power
Lease cost
Operating lease cost	19	16	59
Finance lease cost:
Amortization of ROU assets	2	2	1
Interest on lease obligations	0	0	0
Total finance lease cost	2	2	1
Short-term lease costs	15	16	44
Variable lease cost		0	13
Variable lease cost	(1)
Sublease income			0
Total lease cost	35	34	117
Alabama Power | Assets Subject to Power Purchase Agreement
Lease cost
Operating lease cost	5	4	48
Georgia Power
Lease cost
Operating lease cost	190	192	198
Finance lease cost:
Amortization of ROU assets	23	19	15
Interest on lease obligations	15	17	17
Total finance lease cost	38	36	32
Short-term lease costs	15	16	13
Variable lease cost	77	74	105
Sublease income			0
Total lease cost	320	318	348
Georgia Power | Assets Subject to Power Purchase Agreement
Lease cost
Operating lease cost	168	174	180
Mississippi Power
Lease cost
Operating lease cost	4	5	5
Finance lease cost:
Amortization of ROU assets	1	1	1
Interest on lease obligations	1	0	1
Total finance lease cost	2	1	2
Short-term lease costs	0	0	0
Variable lease cost	0	0	0
Sublease income			0
Total lease cost	6	6	7
Southern Power
Lease cost
Operating lease cost	27	34	32
Finance lease cost:
Amortization of ROU assets	0	0	0
Interest on lease obligations	0	0	0
Total finance lease cost	0	0	0
Short-term lease costs	0	0	0
Variable lease cost	4	4	5
Sublease income			0
Total lease cost	31	38	37
Southern Company Gas
Lease cost
Operating lease cost	12	12	15
Finance lease cost:
Amortization of ROU assets	0	0	0
Interest on lease obligations	0	0	0
Total finance lease cost	0	0	0
Short-term lease costs	0	0	0
Variable lease cost	0	0	0
Sublease income			0
Total lease cost	$ 12	$ 12	$ 15

LEASES - Other Information (Det

LEASES - Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash paid for amounts included in the measurements of lease obligations:
Operating cash flows from operating leases	$ 243	$ 253	$ 303
Operating cash flows from finance leases	15	15	11
Financing cash flows from finance leases	11	18	16
ROU assets obtained under operating leases	146	100	56
Reassessment of ROU assets under operating leases	(7)		16
ROU assets obtained under finance leases	$ 1	$ 3	118
Weighted-average remaining lease term in years:
Operating leases	16 years 4 months 24 days	17 years 2 months 12 days
Finance leases	16 years	16 years 8 months 12 days
Weighted-average discount rate:
Operating leases	4.73%	4.68%
Finance leases	4.86%	4.85%
Alabama Power
Cash paid for amounts included in the measurements of lease obligations:
Operating cash flows from operating leases	$ 19	$ 17	58
Operating cash flows from finance leases	0	0	0
Financing cash flows from finance leases	2	2	1
ROU assets obtained under operating leases	11	30	10
Reassessment of ROU assets under operating leases	0		0
ROU assets obtained under finance leases	$ 0	$ 3	2
Weighted-average remaining lease term in years:
Operating leases	10 years 2 months 12 days	11 years 1 month 6 days
Finance leases	2 years 8 months 12 days	4 years 3 months 18 days
Weighted-average discount rate:
Operating leases	5.04%	5.02%
Finance leases	4.05%	3.93%
Georgia Power
Cash paid for amounts included in the measurements of lease obligations:
Operating cash flows from operating leases	$ 186	$ 199	206
Operating cash flows from finance leases	21	22	20
Financing cash flows from finance leases	23	16	10
ROU assets obtained under operating leases	609	26	17
Reassessment of ROU assets under operating leases	0		0
ROU assets obtained under finance leases	$ 44	$ 18	116
Weighted-average remaining lease term in years:
Operating leases	7 years 10 months 24 days	7 years 6 months
Finance leases	10 years 1 month 6 days	10 years 7 months 6 days
Weighted-average discount rate:
Operating leases	4.73%	4.58%
Finance leases	5.80%	5.95%
Mississippi Power
Cash paid for amounts included in the measurements of lease obligations:
Operating cash flows from operating leases	$ 4	$ 5	5
Operating cash flows from finance leases	0	0	1
Financing cash flows from finance leases	1	1	1
ROU assets obtained under operating leases	0	1	9
Reassessment of ROU assets under operating leases	0		0
ROU assets obtained under finance leases	$ 0	$ 0	0
Weighted-average remaining lease term in years:
Operating leases	4 years 3 months 18 days	4 years 7 months 6 days
Finance leases	10 years 10 months 24 days	11 years 10 months 24 days
Weighted-average discount rate:
Operating leases	3.83%	3.67%
Finance leases	2.74%	2.74%
Southern Power
Cash paid for amounts included in the measurements of lease obligations:
Operating cash flows from operating leases	$ 33	$ 33	30
Operating cash flows from finance leases	0	0	0
Financing cash flows from finance leases	0	0	0
ROU assets obtained under operating leases	10	7	0
Reassessment of ROU assets under operating leases	(7)		16
ROU assets obtained under finance leases	$ 0	$ 0	0
Weighted-average remaining lease term in years:
Operating leases	32 years 3 months 18 days	33 years 1 month 6 days
Weighted-average discount rate:
Operating leases	4.88%	4.89%
Southern Company Gas
Cash paid for amounts included in the measurements of lease obligations:
Operating cash flows from operating leases	$ 12	$ 12	14
Operating cash flows from finance leases	0	0	0
Financing cash flows from finance leases	0	0	0
ROU assets obtained under operating leases	1	7	3
Reassessment of ROU assets under operating leases	0		0
ROU assets obtained under finance leases	$ 0	$ 0	$ 0
Weighted-average remaining lease term in years:
Operating leases	6 years 9 months 18 days	7 years
Weighted-average discount rate:
Operating leases	3.84%	3.80%

LEASES - Maturities of Lease Li

LEASES - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Operating leases:
2025	$ 239
2026	212
2027	190
2028	170
2029	138
Thereafter	1,255
Total	2,204
Less: Present value discount	751
Operating lease obligations	1,453	$ 1,490
Finance leases:
2025	28
2026	27
2027	26
2028	25
2029	25
Thereafter	290
Total	421
Less: Present value discount	134
Finance lease obligations	287	298
Alabama Power
Operating leases:
2025	18
2026	15
2027	12
2028	9
2029	7
Thereafter	56
Total	117
Less: Present value discount	27
Operating lease obligations	90	93
Finance leases:
2025	2
2026	1
2027	1
2028	0
2029	0
Thereafter	0
Total	4
Less: Present value discount	0
Finance lease obligations	4	5
Georgia Power
Operating leases:
2025	228
2026	224
2027	223
2028	217
2029	196
Thereafter	511
Total	1,599
Less: Present value discount	271
Operating lease obligations	1,328	875
Finance leases:
2025	39
2026	41
2027	41
2028	42
2029	42
Thereafter	139
Total	344
Less: Present value discount	83
Finance lease obligations	261	240
Mississippi Power
Operating leases:
2025	4
2026	3
2027	1
2028	0
2029	0
Thereafter	1
Total	9
Less: Present value discount	1
Operating lease obligations	8	9
Finance leases:
2025	2
2026	2
2027	1
2028	1
2029	1
Thereafter	9
Total	16
Less: Present value discount	2
Finance lease obligations	14	16
Southern Power
Operating leases:
2025	31
2026	29
2027	29
2028	29
2029	30
Thereafter	978
Total	1,126
Less: Present value discount	586
Operating lease obligations	540	546
Finance leases:
2025	0
2026	0
2027	0
2028	0
2029	0
Thereafter	0
Total	0
Less: Present value discount	0
Finance lease obligations	0	0
Southern Company Gas
Operating leases:
2025	12
2026	9
2027	4
2028	3
2029	4
Thereafter	15
Total	47
Less: Present value discount	6
Operating lease obligations	41	51
Finance leases:
2025	0
2026	0
2027	0
2028	0
2029	0
Thereafter	0
Total	0
Less: Present value discount	0
Finance lease obligations	$ 0	$ 0

LEASES - Lease Income (Details)

LEASES - Lease Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	$ 24	$ 24	$ 25
Lease income - operating leases	136	164	208
Variable lease income	417	406	417
Total lease income	$ 577	$ 594	$ 650
Operating lease, income, comprehensive income, extensible list, not disclosed, flag	Lease income - operating leases	Lease income - operating leases	Lease income - operating leases
Alabama Power
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	$ 0	$ 0	$ 0
Lease income - operating leases	9	35	77
Variable lease income	1	1	1
Total lease income	10	36	78
Georgia Power
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	0	0	0
Lease income - operating leases	28	29	32
Variable lease income	0	0	0
Total lease income	28	29	32
Mississippi Power
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	15	14	15
Lease income - operating leases	3	2	2
Variable lease income	0	0	0
Total lease income	18	16	17
Southern Power
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	9	10	10
Lease income - operating leases	88	85	85
Variable lease income	450	437	448
Total lease income	547	532	543
Southern Company Gas
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	0	0	0
Lease income - operating leases	36	37	36
Variable lease income	0	0	0
Total lease income	$ 36	$ 37	$ 36

LEASES - Undiscounted Cash Flow

LEASES - Undiscounted Cash Flows to be Received Under Tolling Arrangements Accounted for as Sales-type Leases (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
2025	$ 52
2026	38
2027	37
2028	36
2029	35
Thereafter	302
Total undiscounted cash flows	500
Lease receivable	297
Difference between undiscounted cash flows and discounted cash flows	203
Mississippi Power
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
2025	24
2026	23
2027	22
2028	21
2029	20
Thereafter	132
Total undiscounted cash flows	242
Lease receivable	139
Difference between undiscounted cash flows and discounted cash flows	103
Southern Power
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
2025	15
2026	15
2027	15
2028	15
2029	15
Thereafter	170
Total undiscounted cash flows	245
Lease receivable	158
Difference between undiscounted cash flows and discounted cash flows	87
Other Property and Investments | Mississippi Power
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Lease receivable	129	$ 138
Other current assets | Mississippi Power
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Lease receivable	10	10
Other current assets | Southern Power
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Lease receivable	15	15
Net investment in sales-type leases | Southern Power
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Lease receivable	$ 143	$ 148

LEASES - Undiscounted Cash Fl_2

LEASES - Undiscounted Cash Flows to be Received Under PPAs Accounted for as Operating Leases (Details) $ in Millions	Dec. 31, 2024 USD ($)
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2025	$ 117
2026	111
2027	109
2028	109
2029	112
Thereafter	621
Total	1,179
Alabama Power
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2025	6
2026	5
2027	4
2028	4
2029	3
Thereafter	31
Total	53
Southern Power
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2025	142
2026	148
2027	150
2028	161
2029	164
Thereafter	506
Total	1,271
Southern Company Gas
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2025	35
2026	29
2027	28
2028	28
2029	28
Thereafter	326
Total	$ 474

LEASES - Leveraged Leases (Narr

LEASES - Leveraged Leases (Narrative) (Details)	12 Months Ended
	Dec. 31, 2024 leveragedLease
Leases [Abstract]
Number of leveraged leases	1
Remaining lease term	7 years

INCOME TAXES - Current and Defe

INCOME TAXES - Current and Deferred Income Tax Provisions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Federal —
Current	$ 221	$ 54	$ 10
Deferred	387	299	455
Total federal taxes	608	353	465
State —
Current	152	41	27
Deferred	209	102	303
Total state taxes	361	143	330
Income taxes	969	496	795
Alabama Power
Federal —
Current	357	242	54
Deferred	(111)	(257)	259
Total federal taxes	246	(15)	313
State —
Current	103	82	14
Deferred	11	14	96
Total state taxes	114	96	110
Income taxes	360	81	423
Georgia Power
Federal —
Current	200	205	38
Deferred	211	195	152
Total federal taxes	411	400	190
State —
Current	52	37	(21)
Deferred	140	11	201
Total state taxes	192	48	180
Income taxes	603	448	370
Mississippi Power
Federal —
Current	32	49	42
Deferred	2	(26)	(16)
Total federal taxes	34	23	26
State —
Current	(1)	1	0
Deferred	14	12	11
Total state taxes	13	13	11
Income taxes	47	36	37
Southern Power
Federal —
Current	(112)	(320)	(43)
Deferred	106	334	56
Total federal taxes	(6)	14	13
State —
Current	6	(1)	2
Deferred	(13)	(1)	5
Total state taxes	(7)	(2)	7
Income taxes	(13)	12	20
Southern Company Gas
Federal —
Current	84	62	122
Deferred	86	68	(3)
Total federal taxes	170	130	119
State —
Current	42	24	42
Deferred	46	57	19
Total state taxes	88	81	61
Income taxes	$ 258	$ 211	$ 180

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Line Items]
Deferred income tax assets	$ 7,593	$ 7,886
State investment tax credit carryforward	515
Operating loss carryforwards, valuation allowance	82
Southern Power
Income Tax Disclosure [Line Items]
Deferred income tax assets	$ 638	773
Percentage reduction in tax basis of assets	50%
Operating loss carryforwards, valuation allowance	$ 21
Proceeds From Tax Credit Transfer	24
Southern Power | ITCs and other credits carryforward
Income Tax Disclosure [Line Items]
Reduction in income tax expense, investment tax credits	71	332	$ 49
Southern Power | Production Tax Credit Carryforward
Income Tax Disclosure [Line Items]
Effective income tax rate reconciliation, tax credit, production, amount	32	26	27
Georgia Power
Income Tax Disclosure [Line Items]
Deferred income tax assets	3,564	3,718
State investment tax credit carryforward	472
Georgia Power | Production Tax Credit Carryforward
Income Tax Disclosure [Line Items]
Payments for transferred tax credit	131	39
Mississippi Power
Income Tax Disclosure [Line Items]
Deferred income tax assets	358	382
Southern Company Gas
Income Tax Disclosure [Line Items]
Deferred income tax assets	493	377
State and Local Jurisdiction
Income Tax Disclosure [Line Items]
Valuation allowance	161
Change in valuation allowance	101
State and Local Jurisdiction | Georgia Power
Income Tax Disclosure [Line Items]
Valuation allowance	124
Change in valuation allowance	64
Proceeds From Tax Credit Transfer	11
State and Local Jurisdiction | Georgia Power | ITCs and other credits carryforward
Income Tax Disclosure [Line Items]
Reduction in income tax expense, investment tax credits	44	$ 49	53
Deferred Charges Related To Income Taxes, Current | Other Noncurrent Assets | Southern Power | Unrealized Tax Credits
Income Tax Disclosure [Line Items]
Deferred income tax assets	0		$ 17
Mississippi | Mississippi Power
Income Tax Disclosure [Line Items]
Operating loss carryforwards, valuation allowance	32
Oklahoma | Southern Power
Income Tax Disclosure [Line Items]
Operating loss carryforwards, valuation allowance	11
Florida | Southern Power
Income Tax Disclosure [Line Items]
Operating loss carryforwards, valuation allowance	$ 10

INCOME TAXES - Amortization of

INCOME TAXES - Amortization of Deferred Credits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Line Items]
Amortization of investment tax credits	$ 109	$ 84	$ 83
Southern Power
Income Tax Disclosure [Line Items]
Amortization of investment tax credits	$ 58	$ 58	$ 58

INCOME TAXES - Reconciliation o

INCOME TAXES - Reconciliation of Federal Statutory Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of federal statutory income tax rate to effective income tax rate
Federal statutory rate	21%	21%	21%
State income tax, net of federal deduction	3.60%	2.90%	7.80%
Changes in valuation allowance, net of federal benefit	1.90%	(0.30%)	(1.60%)
Employee stock plans' dividend deduction	(0.40%)	(0.50%)	(0.50%)
Non-deductible book depreciation	0.60%	0.70%	0.60%
Flowback of excess deferred income taxes	(3.90%)	(9.20%)	(6.60%)
AFUDC-Equity	(0.80%)	(1.10%)	(1.10%)
Federal PTCs	(2.80%)	(1.20%)	0%
ITC amortization	(1.20%)	(1.30%)	(1.30%)
Noncontrolling interests	0.60%	0.60%	0.50%
Other	(0.10%)	(0.20%)	0%
Effective income tax (benefit) rate	18.50%	11.40%	18.80%
Alabama Power
Reconciliation of federal statutory income tax rate to effective income tax rate
Federal statutory rate	21%	21%	21%
State income tax, net of federal deduction	5%	5.20%	4.80%
Changes in valuation allowance, net of federal benefit	0%	0%	0%
Employee stock plans' dividend deduction	0%	0%	0%
Non-deductible book depreciation	0.60%	0.70%	0.50%
Flowback of excess deferred income taxes	(5.30%)	(19.80%)	(1.90%)
AFUDC-Equity	(0.70%)	(1.20%)	(0.80%)
Federal PTCs	(0.10%)	0%	0%
ITC amortization	(0.10%)	(0.10%)	(0.10%)
Noncontrolling interests	0%	0%	0%
Other	0%	(0.20%)	0.30%
Effective income tax (benefit) rate	20.40%	5.60%	23.80%
Georgia Power
Reconciliation of federal statutory income tax rate to effective income tax rate
Federal statutory rate	21%	21%	21%
State income tax, net of federal deduction	1.70%	2.10%	3.30%
Changes in valuation allowance, net of federal benefit	3.10%	(0.60%)	3.20%
Employee stock plans' dividend deduction	0%	0%	0%
Non-deductible book depreciation	0.70%	0.80%	0.60%
Flowback of excess deferred income taxes	(2.20%)	(2.60%)	(9.60%)
AFUDC-Equity	(1.00%)	(1.20%)	(1.50%)
Federal PTCs	(3.70%)	(1.40%)	0%
ITC amortization	(0.20%)	(0.10%)	(0.10%)
Noncontrolling interests	0%	0%	0%
Other	(0.20%)	(0.30%)	0%
Effective income tax (benefit) rate	19.20%	17.70%	16.90%
Mississippi Power
Reconciliation of federal statutory income tax rate to effective income tax rate
Federal statutory rate	21%	21%	21%
State income tax, net of federal deduction	4.40%	4.90%	4.40%
Changes in valuation allowance, net of federal benefit	0%	0%	0%
Employee stock plans' dividend deduction	0%	0%	0%
Non-deductible book depreciation	0.30%	0.40%	0.30%
Flowback of excess deferred income taxes	(6.50%)	(10.20%)	(7.80%)
AFUDC-Equity	0%	0%	0%
Federal PTCs	0%	0%	0%
ITC amortization	0%	0%	0%
Noncontrolling interests	0%	0%	0%
Other	0%	0.10%	0.30%
Effective income tax (benefit) rate	19.20%	16.20%	18.20%
Southern Power
Reconciliation of federal statutory income tax rate to effective income tax rate
Federal statutory rate	21%	21%	21%
State income tax, net of federal deduction	(2.30%)	(0.70%)	1.90%
Changes in valuation allowance, net of federal benefit	0%	0%	0%
Employee stock plans' dividend deduction	0%	0%	0%
Non-deductible book depreciation	0%	0%	0%
Flowback of excess deferred income taxes	0%	0%	0%
AFUDC-Equity	0%	0%	0%
Federal PTCs	(17.20%)	(7.40%)	(6.60%)
ITC amortization	(26.40%)	(19.00%)	(17.20%)
Noncontrolling interests	17.10%	11.10%	8.40%
Other	0.20%	0.10%	(0.10%)
Effective income tax (benefit) rate	(7.60%)	5.10%	7.40%
Southern Company Gas
Reconciliation of federal statutory income tax rate to effective income tax rate
Federal statutory rate	21%	21%	21%
State income tax, net of federal deduction	7%	7.80%	6.40%
Changes in valuation allowance, net of federal benefit	0%	0%	0%
Employee stock plans' dividend deduction	0%	0%	0%
Non-deductible book depreciation	0%	0%	0%
Flowback of excess deferred income taxes	(2.20%)	(2.60%)	(2.50%)
AFUDC-Equity	0%	0%	0%
Federal PTCs	0%	0%	0%
ITC amortization	0%	0%	(0.10%)
Noncontrolling interests	0%	0%	0%
Other	0%	(0.60%)	(0.90%)
Effective income tax (benefit) rate	25.80%	25.60%	23.90%

INCOME TAXES - Deferred Tax Ass

INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax liabilities —
Deferred income tax liabilities	$ 18,908	$ 18,574
Deferred tax assets —
Deferred income tax assets	7,593	7,886
Valuation allowance	(333)	(206)
Net deferred income tax assets	7,260	7,680
Net deferred income taxes liabilities	11,648	10,894
Accumulated deferred income taxes – assets	(82)	(96)
Accumulated deferred income taxes – liabilities	11,730	10,990
Accelerated depreciation
Deferred tax liabilities —
Deferred income tax liabilities	9,828	9,683
Property basis differences
Deferred tax liabilities —
Deferred income tax liabilities	3,025	2,647
Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	1,067	979
Deferred tax assets —
Deferred income tax assets	897	985
AROs
Deferred tax liabilities —
Deferred income tax liabilities	727	833
Under recovered fuel and natural gas costs
Deferred tax liabilities —
Deferred income tax liabilities	318	601
AROs
Deferred tax liabilities —
Deferred income tax liabilities	1,886	1,902
Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	746	797
Remaining book value of retired assets
Deferred tax liabilities —
Deferred income tax liabilities	360	369
Storm damage reserves
Deferred tax liabilities —
Deferred income tax liabilities	216
Premium on reacquired debt
Deferred tax liabilities —
Deferred income tax liabilities	57	63
Other
Deferred tax liabilities —
Deferred income tax liabilities	678	700
AROs
Deferred tax assets —
Deferred income tax assets	2,613	2,735
CAMT Carryforwards
Deferred tax assets —
Deferred income tax assets	40
ITC and PTC carryforwards
Deferred tax assets —
Deferred income tax assets	1,380	1,387
Estimated loss on plants under construction
Deferred tax assets —
Deferred income tax assets	773	857
Estimated loss on regulatory disallowance
Deferred tax assets —
Deferred income tax assets	20	26
Other state deferred tax attributes
Deferred tax assets —
Deferred income tax assets	366	363
Federal effect of net state deferred tax assets/liabilities
Deferred tax assets —
Deferred income tax assets	402	418
Other property basis differences
Deferred tax assets —
Deferred income tax assets	176	197
State effect of federal deferred taxes
Deferred tax assets —
Deferred income tax assets	126	115
Other partnership basis differences
Deferred tax assets —
Deferred income tax assets	60	85
Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)
Deferred tax assets —
Deferred income tax assets	18	34
Long-term debt fair value adjustment
Deferred tax assets —
Deferred income tax assets	73	79
Other comprehensive losses
Deferred tax assets —
Deferred income tax assets	48	67
Other
Deferred tax assets —
Deferred income tax assets	601	538
Alabama Power
Deferred tax liabilities —
Deferred income tax liabilities	6,109	6,101
Deferred tax assets —
Deferred income tax assets	1,931	1,931
Valuation allowance	0	0
Net deferred income tax assets	1,931	1,931
Net deferred income taxes liabilities	4,178	4,170
Accumulated deferred income taxes – assets	0	0
Accumulated deferred income taxes – liabilities	4,178	4,170
Alabama Power | Accelerated depreciation
Deferred tax liabilities —
Deferred income tax liabilities	2,583	2,566
Alabama Power | Property basis differences
Deferred tax liabilities —
Deferred income tax liabilities	1,497	1,444
Alabama Power | Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	362	321
Deferred tax assets —
Deferred income tax assets	196	224
Alabama Power | AROs
Deferred tax liabilities —
Deferred income tax liabilities	458	476
Alabama Power | Under recovered fuel and natural gas costs
Deferred tax liabilities —
Deferred income tax liabilities	13	80
Alabama Power | AROs
Deferred tax liabilities —
Deferred income tax liabilities	658	667
Alabama Power | Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	191	213
Alabama Power | Remaining book value of retired assets
Deferred tax liabilities —
Deferred income tax liabilities	168	143
Alabama Power | Storm damage reserves
Deferred tax liabilities —
Deferred income tax liabilities	0
Alabama Power | Premium on reacquired debt
Deferred tax liabilities —
Deferred income tax liabilities	8	9
Alabama Power | Other
Deferred tax liabilities —
Deferred income tax liabilities	171	182
Alabama Power | AROs
Deferred tax assets —
Deferred income tax assets	1,116	1,143
Alabama Power | CAMT Carryforwards
Deferred tax assets —
Deferred income tax assets	0
Alabama Power | ITC and PTC carryforwards
Deferred tax assets —
Deferred income tax assets	48	12
Alabama Power | Estimated loss on plants under construction
Deferred tax assets —
Deferred income tax assets	0	0
Alabama Power | Estimated loss on regulatory disallowance
Deferred tax assets —
Deferred income tax assets	0	0
Alabama Power | Other state deferred tax attributes
Deferred tax assets —
Deferred income tax assets	0	0
Alabama Power | Federal effect of net state deferred tax assets/liabilities
Deferred tax assets —
Deferred income tax assets	197	215
Alabama Power | Other property basis differences
Deferred tax assets —
Deferred income tax assets	0	0
Alabama Power | State effect of federal deferred taxes
Deferred tax assets —
Deferred income tax assets	126	115
Alabama Power | Other partnership basis differences
Deferred tax assets —
Deferred income tax assets	0	0
Alabama Power | Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)
Deferred tax assets —
Deferred income tax assets	18	30
Alabama Power | Long-term debt fair value adjustment
Deferred tax assets —
Deferred income tax assets	0	0
Alabama Power | Other comprehensive losses
Deferred tax assets —
Deferred income tax assets	3	4
Alabama Power | Other
Deferred tax assets —
Deferred income tax assets	227	188
Georgia Power
Deferred tax liabilities —
Deferred income tax liabilities	7,792	7,661
Deferred tax assets —
Deferred income tax assets	3,564	3,718
Valuation allowance	(157)	(75)
Net deferred income tax assets	3,407	3,643
Net deferred income taxes liabilities	4,385	4,018
Accumulated deferred income taxes – assets	0	0
Accumulated deferred income taxes – liabilities	4,385	4,018
Georgia Power | Accelerated depreciation
Deferred tax liabilities —
Deferred income tax liabilities	3,810	3,628
Georgia Power | Property basis differences
Deferred tax liabilities —
Deferred income tax liabilities	918	812
Georgia Power | Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	470	446
Deferred tax assets —
Deferred income tax assets	279	316
Georgia Power | AROs
Deferred tax liabilities —
Deferred income tax liabilities	221	314
Georgia Power | Under recovered fuel and natural gas costs
Deferred tax liabilities —
Deferred income tax liabilities	305	508
Georgia Power | AROs
Deferred tax liabilities —
Deferred income tax liabilities	1,193	1,196
Georgia Power | Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	237	260
Georgia Power | Remaining book value of retired assets
Deferred tax liabilities —
Deferred income tax liabilities	187	221
Georgia Power | Storm damage reserves
Deferred tax liabilities —
Deferred income tax liabilities	216
Georgia Power | Premium on reacquired debt
Deferred tax liabilities —
Deferred income tax liabilities	48	53
Georgia Power | Other
Deferred tax liabilities —
Deferred income tax liabilities	187	223
Georgia Power | AROs
Deferred tax assets —
Deferred income tax assets	1,414	1,510
Georgia Power | CAMT Carryforwards
Deferred tax assets —
Deferred income tax assets	18
Georgia Power | ITC and PTC carryforwards
Deferred tax assets —
Deferred income tax assets	719	691
Georgia Power | Estimated loss on plants under construction
Deferred tax assets —
Deferred income tax assets	773	857
Georgia Power | Estimated loss on regulatory disallowance
Deferred tax assets —
Deferred income tax assets	0	0
Georgia Power | Other state deferred tax attributes
Deferred tax assets —
Deferred income tax assets	26	13
Georgia Power | Federal effect of net state deferred tax assets/liabilities
Deferred tax assets —
Deferred income tax assets	100	92
Georgia Power | Other property basis differences
Deferred tax assets —
Deferred income tax assets	75	83
Georgia Power | State effect of federal deferred taxes
Deferred tax assets —
Deferred income tax assets	0	0
Georgia Power | Other partnership basis differences
Deferred tax assets —
Deferred income tax assets	0	0
Georgia Power | Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)
Deferred tax assets —
Deferred income tax assets	0	0
Georgia Power | Long-term debt fair value adjustment
Deferred tax assets —
Deferred income tax assets	0	0
Georgia Power | Other comprehensive losses
Deferred tax assets —
Deferred income tax assets	0	4
Georgia Power | Other
Deferred tax assets —
Deferred income tax assets	160	152
Mississippi Power
Deferred tax liabilities —
Deferred income tax liabilities	727	714
Deferred tax assets —
Deferred income tax assets	358	382
Valuation allowance	(41)	(41)
Net deferred income tax assets	317	341
Net deferred income taxes liabilities	410	373
Accumulated deferred income taxes – assets	(82)	(96)
Accumulated deferred income taxes – liabilities	492	469
Mississippi Power | Accelerated depreciation
Deferred tax liabilities —
Deferred income tax liabilities	344	339
Mississippi Power | Property basis differences
Deferred tax liabilities —
Deferred income tax liabilities	192	188
Mississippi Power | Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	54	49
Deferred tax assets —
Deferred income tax assets	49	52
Mississippi Power | AROs
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Mississippi Power | Under recovered fuel and natural gas costs
Deferred tax liabilities —
Deferred income tax liabilities	0	13
Mississippi Power | AROs
Deferred tax liabilities —
Deferred income tax liabilities	35	39
Mississippi Power | Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	35	37
Mississippi Power | Remaining book value of retired assets
Deferred tax liabilities —
Deferred income tax liabilities	5	5
Mississippi Power | Storm damage reserves
Deferred tax liabilities —
Deferred income tax liabilities	0
Mississippi Power | Premium on reacquired debt
Deferred tax liabilities —
Deferred income tax liabilities	1	1
Mississippi Power | Other
Deferred tax liabilities —
Deferred income tax liabilities	61	43
Mississippi Power | AROs
Deferred tax assets —
Deferred income tax assets	35	39
Mississippi Power | CAMT Carryforwards
Deferred tax assets —
Deferred income tax assets	0
Mississippi Power | ITC and PTC carryforwards
Deferred tax assets —
Deferred income tax assets	0	0
Mississippi Power | Estimated loss on plants under construction
Deferred tax assets —
Deferred income tax assets	0	0
Mississippi Power | Estimated loss on regulatory disallowance
Deferred tax assets —
Deferred income tax assets	0	0
Mississippi Power | Other state deferred tax attributes
Deferred tax assets —
Deferred income tax assets	224	231
Mississippi Power | Federal effect of net state deferred tax assets/liabilities
Deferred tax assets —
Deferred income tax assets	0	0
Mississippi Power | Other property basis differences
Deferred tax assets —
Deferred income tax assets	0	0
Mississippi Power | State effect of federal deferred taxes
Deferred tax assets —
Deferred income tax assets	0	0
Mississippi Power | Other partnership basis differences
Deferred tax assets —
Deferred income tax assets	0	0
Mississippi Power | Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)
Deferred tax assets —
Deferred income tax assets	0	3
Mississippi Power | Long-term debt fair value adjustment
Deferred tax assets —
Deferred income tax assets	0	0
Mississippi Power | Other comprehensive losses
Deferred tax assets —
Deferred income tax assets	0	0
Mississippi Power | Other
Deferred tax assets —
Deferred income tax assets	50	57
Southern Power
Deferred tax liabilities —
Deferred income tax liabilities	1,323	1,360
Deferred tax assets —
Deferred income tax assets	638	773
Valuation allowance	(27)	(27)
Net deferred income tax assets	611	746
Net deferred income taxes liabilities	712	614
Accumulated deferred income taxes – assets	0	0
Accumulated deferred income taxes – liabilities	712	614
Southern Power | Accelerated depreciation
Deferred tax liabilities —
Deferred income tax liabilities	1,309	1,346
Southern Power | Property basis differences
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Power | Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	13	12
Deferred tax assets —
Deferred income tax assets	16	10
Southern Power | AROs
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Power | Under recovered fuel and natural gas costs
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Power | AROs
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Power | Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Power | Remaining book value of retired assets
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Power | Storm damage reserves
Deferred tax liabilities —
Deferred income tax liabilities	0
Southern Power | Premium on reacquired debt
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Power | Other
Deferred tax liabilities —
Deferred income tax liabilities	1	2
Southern Power | AROs
Deferred tax assets —
Deferred income tax assets	0	0
Southern Power | CAMT Carryforwards
Deferred tax assets —
Deferred income tax assets	0
Southern Power | ITC and PTC carryforwards
Deferred tax assets —
Deferred income tax assets	384	481
Southern Power | Estimated loss on plants under construction
Deferred tax assets —
Deferred income tax assets	0	0
Southern Power | Estimated loss on regulatory disallowance
Deferred tax assets —
Deferred income tax assets	0	0
Southern Power | Other state deferred tax attributes
Deferred tax assets —
Deferred income tax assets	49	49
Southern Power | Federal effect of net state deferred tax assets/liabilities
Deferred tax assets —
Deferred income tax assets	23	27
Southern Power | Other property basis differences
Deferred tax assets —
Deferred income tax assets	85	97
Southern Power | State effect of federal deferred taxes
Deferred tax assets —
Deferred income tax assets	0	0
Southern Power | Other partnership basis differences
Deferred tax assets —
Deferred income tax assets	60	85
Southern Power | Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)
Deferred tax assets —
Deferred income tax assets	0	0
Southern Power | Long-term debt fair value adjustment
Deferred tax assets —
Deferred income tax assets	0	0
Southern Power | Other comprehensive losses
Deferred tax assets —
Deferred income tax assets	1	6
Southern Power | Other
Deferred tax assets —
Deferred income tax assets	20	18
Southern Company Gas
Deferred tax liabilities —
Deferred income tax liabilities	2,283	2,041
Deferred tax assets —
Deferred income tax assets	493	377
Valuation allowance	(6)	(7)
Net deferred income tax assets	487	370
Net deferred income taxes liabilities	1,796	1,671
Accumulated deferred income taxes – assets	0	0
Accumulated deferred income taxes – liabilities	1,796	1,671
Southern Company Gas | Accelerated depreciation
Deferred tax liabilities —
Deferred income tax liabilities	1,575	1,576
Southern Company Gas | Property basis differences
Deferred tax liabilities —
Deferred income tax liabilities	412	189
Southern Company Gas | Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	60	74
Deferred tax assets —
Deferred income tax assets	87	89
Southern Company Gas | AROs
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Company Gas | Under recovered fuel and natural gas costs
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Company Gas | AROs
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Company Gas | Employee benefit obligations
Deferred tax liabilities —
Deferred income tax liabilities	35	11
Southern Company Gas | Remaining book value of retired assets
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Company Gas | Storm damage reserves
Deferred tax liabilities —
Deferred income tax liabilities	0
Southern Company Gas | Premium on reacquired debt
Deferred tax liabilities —
Deferred income tax liabilities	0	0
Southern Company Gas | Other
Deferred tax liabilities —
Deferred income tax liabilities	201	191
Southern Company Gas | AROs
Deferred tax assets —
Deferred income tax assets	0	0
Southern Company Gas | CAMT Carryforwards
Deferred tax assets —
Deferred income tax assets	104
Southern Company Gas | ITC and PTC carryforwards
Deferred tax assets —
Deferred income tax assets	0	0
Southern Company Gas | Estimated loss on plants under construction
Deferred tax assets —
Deferred income tax assets	0	0
Southern Company Gas | Estimated loss on regulatory disallowance
Deferred tax assets —
Deferred income tax assets	20	26
Southern Company Gas | Other state deferred tax attributes
Deferred tax assets —
Deferred income tax assets	16	8
Southern Company Gas | Federal effect of net state deferred tax assets/liabilities
Deferred tax assets —
Deferred income tax assets	107	101
Southern Company Gas | Other property basis differences
Deferred tax assets —
Deferred income tax assets	0	0
Southern Company Gas | State effect of federal deferred taxes
Deferred tax assets —
Deferred income tax assets	0	0
Southern Company Gas | Other partnership basis differences
Deferred tax assets —
Deferred income tax assets	0	0
Southern Company Gas | Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)
Deferred tax assets —
Deferred income tax assets	0	0
Southern Company Gas | Long-term debt fair value adjustment
Deferred tax assets —
Deferred income tax assets	73	79
Southern Company Gas | Other comprehensive losses
Deferred tax assets —
Deferred income tax assets	0	0
Southern Company Gas | Other
Deferred tax assets —
Deferred income tax assets	$ 86	$ 74

INCOME TAXES - Federal ITC_PTC

INCOME TAXES - Federal ITC/PTC Carryforwards (Details) $ in Millions	Dec. 31, 2024 USD ($)
ITC and PTC carryforwards
Operating Loss Carryforwards [Line Items]
Federal ITC/PTC carryforwards	$ 765
ITC and PTC carryforwards | Alabama Power
Operating Loss Carryforwards [Line Items]
Federal ITC/PTC carryforwards	48
ITC and PTC carryforwards | Georgia Power
Operating Loss Carryforwards [Line Items]
Federal ITC/PTC carryforwards	147
ITC and PTC carryforwards | Southern Power
Operating Loss Carryforwards [Line Items]
Federal ITC/PTC carryforwards	384
Corporate Alternative Minimum Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Federal ITC/PTC carryforwards	$ 40

INCOME TAXES - NOL Carryforward

INCOME TAXES - NOL Carryforwards (Details) $ in Millions	Dec. 31, 2024 USD ($)
Operating Loss Carryforwards [Line Items]
Approximate Net State Income Tax Benefit of NOL Carryforwards	$ 265
Operating loss carryforwards, valuation allowance	(82)
Mississippi Power | Mississippi
Operating Loss Carryforwards [Line Items]
Approximate Net State Income Tax Benefit of NOL Carryforwards	178
Operating loss carryforwards, valuation allowance	(32)
Southern Power
Operating Loss Carryforwards [Line Items]
Approximate Net State Income Tax Benefit of NOL Carryforwards	38
Operating loss carryforwards, valuation allowance	(21)
Southern Power | Oklahoma
Operating Loss Carryforwards [Line Items]
Approximate Net State Income Tax Benefit of NOL Carryforwards	26
Operating loss carryforwards, valuation allowance	(11)
Southern Power | Florida
Operating Loss Carryforwards [Line Items]
Approximate Net State Income Tax Benefit of NOL Carryforwards	10
Operating loss carryforwards, valuation allowance	(10)
Southern Power | Other states
Operating Loss Carryforwards [Line Items]
Approximate Net State Income Tax Benefit of NOL Carryforwards	2
Operating loss carryforwards, valuation allowance	0
Other Subsidiaries | Other states
Operating Loss Carryforwards [Line Items]
Approximate Net State Income Tax Benefit of NOL Carryforwards	24
Operating loss carryforwards, valuation allowance	(4)
Other Subsidiaries | New York
Operating Loss Carryforwards [Line Items]
Approximate Net State Income Tax Benefit of NOL Carryforwards	11
Operating loss carryforwards, valuation allowance	(11)
Other Subsidiaries | New York City
Operating Loss Carryforwards [Line Items]
Approximate Net State Income Tax Benefit of NOL Carryforwards	14
Operating loss carryforwards, valuation allowance	$ (14)

INCOME TAXES - Changes in Unrec

INCOME TAXES - Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in unrecognized tax benefits [Roll Forward]
Beginning balance	$ 116	$ 80	$ 47
Increase from prior periods	10	88	33
Decrease from prior periods	(44)
Ending balance	82	116	80
Estimated loss on plants under construction
Changes in unrecognized tax benefits [Roll Forward]
Statute of limitations expiration		(52)
Georgia Power
Changes in unrecognized tax benefits [Roll Forward]
Beginning balance	77	0	0
Increase from prior periods	0	86	0
Decrease from prior periods	(43)
Ending balance	34	77	0
Georgia Power | Estimated loss on plants under construction
Changes in unrecognized tax benefits [Roll Forward]
Statute of limitations expiration		(9)
Southern Company Gas
Changes in unrecognized tax benefits [Roll Forward]
Beginning balance	34	32	0
Increase from prior periods	10	2	32
Decrease from prior periods	0
Ending balance	$ 44	34	$ 32
Southern Company Gas | Estimated loss on plants under construction
Changes in unrecognized tax benefits [Roll Forward]
Statute of limitations expiration		$ 0

RETIREMENT BENEFITS - Narrative

RETIREMENT BENEFITS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Plan asset amortization period	5 years
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 65,000,000	$ 52,000,000
Expected future employer contributions, next fiscal year	0
Actuarial losses	$ (887,000,000)	$ 493,000,000
Change in discount rate	0.69%	0.18%
Pension plans | Qualified pension plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 0
Other postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	55,000,000	$ 73,000,000
Expected future employer contributions, next fiscal year	0
Actuarial losses	$ (2,000,000)	$ (33,000,000)

RETIREMENT BENEFITS - Actuarial

RETIREMENT BENEFITS - Actuarial Assumptions (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.07%	5.25%	3.09%
Expected long-term return on plan assets	8.30%	8.40%	8.25%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Pension plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.94%	5.13%	2.55%
Pension plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.19%	5.36%	3.34%
Pension plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.76%	5.07%
Annual salary increase, benefit obligations	4.60%	4.60%
Other postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	4.99%	5.18%	2.90%
Expected long-term return on plan assets	7.67%	7.67%	7.21%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Other postretirement benefit plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.90%	5.08%	2.32%
Other postretirement benefit plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.16%	5.34%	3.26%
Other postretirement benefit plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.64%	4.99%
Annual salary increase, benefit obligations	4.60%	4.60%
Alabama Power | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.08%	5.26%	3.12%
Expected long-term return on plan assets	8.30%	8.40%	8.25%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Alabama Power | Pension plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.94%	5.14%	2.58%
Alabama Power | Pension plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.20%	5.38%	3.36%
Alabama Power | Pension plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.78%	5.08%
Annual salary increase, benefit obligations	4.60%	4.60%
Alabama Power | Other postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.01%	5.20%	2.95%
Expected long-term return on plan assets	7.97%	7.95%	7.54%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Alabama Power | Other postretirement benefit plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.90%	5.09%	2.38%
Alabama Power | Other postretirement benefit plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.17%	5.35%	3.30%
Alabama Power | Other postretirement benefit plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.67%	5.01%
Annual salary increase, benefit obligations	4.60%	4.60%
Georgia Power | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.06%	5.25%	3.07%
Expected long-term return on plan assets	8.30%	8.40%	8.25%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Georgia Power | Pension plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.94%	5.12%	2.51%
Georgia Power | Pension plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.21%	5.38%	3.37%
Georgia Power | Pension plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.75%	5.06%
Annual salary increase, benefit obligations	4.60%	4.60%
Georgia Power | Other postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	4.98%	5.17%	2.87%
Expected long-term return on plan assets	7.59%	7.49%	6.88%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Georgia Power | Other postretirement benefit plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.89%	5.07%	2.30%
Georgia Power | Other postretirement benefit plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.16%	5.34%	3.27%
Georgia Power | Other postretirement benefit plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.61%	4.98%
Annual salary increase, benefit obligations	4.60%	4.60%
Mississippi Power | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.06%	5.25%	3.07%
Expected long-term return on plan assets	8.30%	8.40%	8.25%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Mississippi Power | Pension plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.93%	5.12%	2.54%
Mississippi Power | Pension plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.19%	5.37%	3.35%
Mississippi Power | Pension plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.76%	5.06%
Annual salary increase, benefit obligations	4.60%	4.60%
Mississippi Power | Other postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	4.98%	5.17%	2.88%
Expected long-term return on plan assets	7.43%	7.43%	7.22%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Mississippi Power | Other postretirement benefit plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.90%	5.08%	2.27%
Mississippi Power | Other postretirement benefit plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.16%	5.33%	3.26%
Mississippi Power | Other postretirement benefit plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.63%	4.98%
Annual salary increase, benefit obligations	4.60%	4.60%
Southern Power | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.14%	5.31%	3.21%
Expected long-term return on plan assets	8.30%	8.40%	8.25%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Southern Power | Pension plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.01%	5.19%	2.79%
Southern Power | Pension plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.20%	5.37%	3.36%
Southern Power | Pension plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.84%	5.14%
Annual salary increase, benefit obligations	4.60%	4.60%
Southern Power | Other postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.06%	5.24%	3.07%
Expected long-term return on plan assets	0%	0%	0%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Southern Power | Other postretirement benefit plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.94%	5.12%	2.55%
Southern Power | Other postretirement benefit plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.14%	5.33%	3.25%
Southern Power | Other postretirement benefit plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.73%	5.06%
Annual salary increase, benefit obligations	4.60%	4.60%
Southern Company Gas | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.05%	5.24%	3.04%
Expected long-term return on plan assets	8.30%	8.40%	8.25%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Southern Company Gas | Pension plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.93%	5.12%	2.53%
Southern Company Gas | Pension plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.13%	5.31%	3.21%
Southern Company Gas | Pension plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.73%	5.05%
Annual salary increase, benefit obligations	4.60%	4.60%
Southern Company Gas | Other postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	4.98%	5.16%	2.82%
Expected long-term return on plan assets	6.36%	6.59%	6.08%
Annual salary increase, net periodic costs	4.60%	4.80%	4.80%
Southern Company Gas | Other postretirement benefit plans | Discount rate – interest costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	4.89%	5.07%	2.17%
Southern Company Gas | Other postretirement benefit plans | Discount rate – service costs
Defined Benefit Plan Disclosure [Line Items]
Discount rate, net periodic benefit costs	5.16%	5.33%	3.22%
Southern Company Gas | Other postretirement benefit plans | Employee benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligations	5.62%	4.98%
Annual salary increase, benefit obligations	4.60%	4.60%

RETIREMENT BENEFITS - Schedule

RETIREMENT BENEFITS - Schedule of Health Care Cost Trend Rates (Details)	Dec. 31, 2024
Pre-65
Defined Benefit Plan Disclosure [Line Items]
Initial Cost Trend Rate	8%
Ultimate Cost Trend Rate	4.50%
Post-65 medical
Defined Benefit Plan Disclosure [Line Items]
Initial Cost Trend Rate	5.50%
Ultimate Cost Trend Rate	4.50%
Post-65 prescription
Defined Benefit Plan Disclosure [Line Items]
Initial Cost Trend Rate	11%
Ultimate Cost Trend Rate	4.50%

RETIREMENT BENEFITS - Accumulat

RETIREMENT BENEFITS - Accumulated Benefit Obligation (Details) - Pension plans - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation for the pension plans	$ 11,437	$ 11,991
Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation for the pension plans	2,617	2,746
Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation for the pension plans	3,438	3,674
Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation for the pension plans	519	546
Southern Power
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation for the pension plans	140	145
Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation for the pension plans	$ 779	$ 808

RETIREMENT BENEFITS - Changes i

RETIREMENT BENEFITS - Changes in Projected Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension plans
Change in benefit obligation
Benefit obligation at beginning of year	$ 13,252	$ 12,602
Service cost	292	275	$ 412
Interest cost	635	626	408
Benefits paid	(728)	(744)
Actuarial gain	(887)	493
Balance at end of year	12,564	13,252	12,602
Change in plan assets
Fair value of plan assets at beginning of year	14,618	14,218
Actual return on plan assets	604	1,092
Employer contributions	65	52
Benefits paid	(728)	(744)
Fair value of plan assets at end of year	14,559	14,618	14,218
Accrued asset	1,995	1,366
Other postretirement benefit plans
Change in benefit obligation
Benefit obligation at beginning of year	1,386	1,441
Service cost	15	15	23
Interest cost	65	70	42
Benefits paid	(105)	(107)
Actuarial gain	(2)	(33)
Balance at end of year	1,359	1,386	1,441
Change in plan assets
Fair value of plan assets at beginning of year	1,095	998
Actual return on plan assets	96	131
Employer contributions	55	73
Benefits paid	(105)	(107)
Fair value of plan assets at end of year	1,141	1,095	998
Accrued asset	(218)	(291)
Alabama Power | Pension plans
Change in benefit obligation
Benefit obligation at beginning of year	3,076	2,906
Service cost	68	64	99
Interest cost	148	145	96
Benefits paid	(162)	(155)
Actuarial gain	(222)	116
Balance at end of year	2,908	3,076	2,906
Change in plan assets
Fair value of plan assets at beginning of year	3,544	3,427
Actual return on plan assets	148	260
Employer contributions	9	11
Benefits paid	(162)	(154)
Fair value of plan assets at end of year	3,539	3,544	3,427
Accrued asset	631	468
Alabama Power | Other postretirement benefit plans
Change in benefit obligation
Benefit obligation at beginning of year	329	344
Service cost	4	4	6
Interest cost	16	17	10
Benefits paid	(25)	(24)
Actuarial gain	2	(12)
Balance at end of year	326	329	344
Change in plan assets
Fair value of plan assets at beginning of year	403	372
Actual return on plan assets	37	52
Employer contributions	6	3
Benefits paid	(25)	(24)
Fair value of plan assets at end of year	421	403	372
Accrued asset	95	74
Georgia Power | Pension plans
Change in benefit obligation
Benefit obligation at beginning of year	4,009	3,851
Service cost	70	68	103
Interest cost	191	191	123
Benefits paid	(239)	(224)
Actuarial gain	(298)	123
Balance at end of year	3,733	4,009	3,851
Change in plan assets
Fair value of plan assets at beginning of year	4,571	4,456
Actual return on plan assets	152	331
Employer contributions	35	9
Benefits paid	(239)	(225)
Fair value of plan assets at end of year	4,519	4,571	4,456
Accrued asset	786	562
Georgia Power | Other postretirement benefit plans
Change in benefit obligation
Benefit obligation at beginning of year	489	514
Service cost	4	4	6
Interest cost	23	25	15
Benefits paid	(37)	(36)
Actuarial gain	9	(18)
Balance at end of year	488	489	514
Change in plan assets
Fair value of plan assets at beginning of year	410	368
Actual return on plan assets	34	51
Employer contributions	13	27
Benefits paid	(37)	(36)
Fair value of plan assets at end of year	420	410	368
Accrued asset	(68)	(79)
Mississippi Power | Pension plans
Change in benefit obligation
Benefit obligation at beginning of year	599	569
Service cost	12	11	17
Interest cost	29	28	18
Benefits paid	(33)	(32)
Actuarial gain	(40)	23
Balance at end of year	567	599	569
Change in plan assets
Fair value of plan assets at beginning of year	669	649
Actual return on plan assets	23	50
Employer contributions	5	2
Benefits paid	(33)	(32)
Fair value of plan assets at end of year	664	669	649
Accrued asset	97	70
Mississippi Power | Other postretirement benefit plans
Change in benefit obligation
Benefit obligation at beginning of year	57	59
Service cost	1	1	1
Interest cost	3	3	2
Benefits paid	(4)	(4)
Actuarial gain	(2)	(2)
Balance at end of year	55	57	59
Change in plan assets
Fair value of plan assets at beginning of year	25	24
Actual return on plan assets	0	2
Employer contributions	3	3
Benefits paid	(4)	(4)
Fair value of plan assets at end of year	24	25	24
Accrued asset	(31)	(32)
Southern Power | Pension plans
Change in benefit obligation
Benefit obligation at beginning of year	177	163
Service cost	7	6	9
Interest cost	9	8	6
Benefits paid	(6)	(6)
Actuarial gain	(20)	6
Balance at end of year	167	177	163
Change in plan assets
Fair value of plan assets at beginning of year	185	178
Actual return on plan assets	7	12
Employer contributions	2	2
Benefits paid	(6)	(7)
Fair value of plan assets at end of year	188	185	178
Accrued asset	21	8
Southern Power | Other postretirement benefit plans
Change in benefit obligation
Benefit obligation at beginning of year	9	9
Service cost	0	0	0
Interest cost	0	0	0
Benefits paid	(1)	(1)
Actuarial gain	1	1
Balance at end of year	9	9	9
Change in plan assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	1	1
Benefits paid	(1)	(1)
Fair value of plan assets at end of year	0	0	0
Accrued asset	(9)	(9)
Southern Company Gas | Pension plans
Change in benefit obligation
Benefit obligation at beginning of year	882	868
Service cost	28	24	34
Interest cost	42	42	28
Benefits paid	(46)	(104)
Actuarial gain	(64)	52
Balance at end of year	842	882	868
Change in plan assets
Fair value of plan assets at beginning of year	980	1,002
Actual return on plan assets	39	79
Employer contributions	5	3
Benefits paid	(46)	(104)
Fair value of plan assets at end of year	978	980	1,002
Accrued asset	136	98
Southern Company Gas | Other postretirement benefit plans
Change in benefit obligation
Benefit obligation at beginning of year	172	179
Service cost	1	1	1
Interest cost	8	9	5
Benefits paid	(12)	(18)
Actuarial gain	(13)	1
Balance at end of year	156	172	179
Change in plan assets
Fair value of plan assets at beginning of year	128	113
Actual return on plan assets	18	19
Employer contributions	7	14
Benefits paid	(12)	(18)
Fair value of plan assets at end of year	141	128	$ 113
Accrued asset	$ (15)	$ (44)

RETIREMENT BENEFITS - Projected

RETIREMENT BENEFITS - Projected Benefit Plan Obligations (Details) - Pension plans - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	$ 12,564	$ 13,252	$ 12,602
Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	2,908	3,076	2,906
Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	3,733	4,009	3,851
Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	567	599	569
SOUTHERN POWER CO
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	167	177	163
Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	842	$ 882	$ 868
Qualified pension plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	11,886
Qualified pension plan | Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	2,794
Qualified pension plan | Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	3,622
Qualified pension plan | Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	540
Qualified pension plan | SOUTHERN POWER CO
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	146
Qualified pension plan | Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	788
Non-qualified pension plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	678
Non-qualified pension plan | Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	114
Non-qualified pension plan | Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	111
Non-qualified pension plan | Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	27
Non-qualified pension plan | SOUTHERN POWER CO
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	21
Non-qualified pension plan | Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations:	$ 54

RETIREMENT BENEFITS - Amounts R

RETIREMENT BENEFITS - Amounts Recognized in Balance Sheets and Amounts in AOCI (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	$ 7,037	$ 6,264
Other current liabilities	(1,100)	(1,029)
Employee benefit obligations	(1,011)	(1,115)
Other regulatory liabilities, deferred	(692)	(715)
Regulatory asset		66	$ 216
Other deferred charges and assets	1,467	1,468
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension costs	2,674	2,079
Other regulatory assets, deferred	2,708	2,960
Other current liabilities	(68)	(64)
Employee benefit obligations	(611)	(649)
Other regulatory liabilities, deferred	(50)	(47)
AOCI	52	79
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	24	23
Other current liabilities	(6)	(6)
Employee benefit obligations	(212)	(285)
Other regulatory liabilities, deferred	(213)	(231)
AOCI	(14)	(9)
Prepaid pension and other postretirement benefit costs	0	0
Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	1,815	1,858
Other current liabilities	(219)	(191)
Employee benefit obligations	(148)	(155)
Other regulatory liabilities, deferred	(271)	(291)
Regulatory asset	70	76	97
Prepaid pension and other postretirement benefit costs	841	659
Other deferred charges and assets	391	414
Alabama Power | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension costs	746	585
Other regulatory assets, deferred	741	821
Other current liabilities	(13)	(11)
Employee benefit obligations	(102)	(106)
Other regulatory liabilities, deferred	0	0
AOCI	0	0
Alabama Power | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	0	0
Other current liabilities	0	0
Employee benefit obligations	0	0
Other regulatory liabilities, deferred	(45)	(48)
AOCI	0	0
Prepaid pension and other postretirement benefit costs	95	74
Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	3,814	2,890
Other current liabilities	(296)	(365)
Employee benefit obligations	(205)	(248)
Regulatory asset			83
Other deferred charges and assets	615	508
Georgia Power | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension costs	897	706
Other regulatory assets, deferred	973	1,051
Other current liabilities	(13)	(13)
Employee benefit obligations	(98)	(131)
Other regulatory liabilities, deferred	0	0
AOCI	0	0
Georgia Power | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	3	11
Other current liabilities	0	0
Employee benefit obligations	(68)	(79)
Other regulatory liabilities, deferred	(67)	(85)
AOCI	0	0
Prepaid pension and other postretirement benefit costs	0	0
Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	259	285
Other current liabilities	(95)	(90)
Employee benefit obligations	(65)	(67)
Other regulatory liabilities, deferred	(121)	(92)
Regulatory asset	52	44	$ 36
Other deferred charges and assets	74	85
Mississippi Power | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension costs	124	99
Other regulatory assets, deferred	144	152
Other current liabilities	(2)	(2)
Employee benefit obligations	(25)	(27)
Other regulatory liabilities, deferred	0	0
AOCI	0	0
Mississippi Power | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	0	0
Other current liabilities	0	0
Employee benefit obligations	(31)	(32)
Other regulatory liabilities, deferred	(9)	(10)
AOCI	0	0
Prepaid pension and other postretirement benefit costs	0	0
Southern Power
Defined Benefit Plan Disclosure [Line Items]
Other current liabilities	(96)	(97)
Other deferred charges and assets	232	262
Southern Power | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension costs	41	31
Other regulatory assets, deferred	0	0
Other current liabilities	(2)	(2)
Employee benefit obligations	(18)	(21)
Other regulatory liabilities, deferred	0	0
AOCI	11	20
Southern Power | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	0	0
Other current liabilities	(1)	(1)
Employee benefit obligations	(8)	(8)
Other regulatory liabilities, deferred	0	0
AOCI	0	1
Prepaid pension and other postretirement benefit costs	0	0
Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	481	504
Other current liabilities	(237)	(232)
Employee benefit obligations	(78)	(110)
Other deferred charges and assets	192	181
Southern Company Gas | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension costs	191	158
Other regulatory assets, deferred	126	143
Other current liabilities	(4)	(3)
Employee benefit obligations	(51)	(58)
Other regulatory liabilities, deferred	0	0
AOCI	(54)	(45)
Regulatory asset	155	173
Southern Company Gas | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Other regulatory assets, deferred	0	0
Other current liabilities	0	0
Employee benefit obligations	(15)	(44)
Other regulatory liabilities, deferred	(84)	(68)
AOCI	(15)	(10)
Regulatory asset	16	24
Prepaid pension and other postretirement benefit costs	$ 0	$ 0

RETIREMENT BENEFITS - Regulator

RETIREMENT BENEFITS - Regulatory Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	$ 7,041	$ 6,523
Regulatory asset		66	$ 216
Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	2,356	2,720
Regulatory asset	70	76	97
Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	6,139	5,090
Regulatory asset			83
Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	59	90
Regulatory asset	52	44	$ 36
Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	(2,252)	(2,225)
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	2,658	2,913
Pension plans | Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	741	821
Pension plans | Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	973	1,051
Pension plans | Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	144	152
Pension plans | Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	126	143
Regulatory asset	155	173
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	189	203
Other Postretirement Benefits Plan | Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	45	48
Other Postretirement Benefits Plan | Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	64	74
Other Postretirement Benefits Plan | Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	9	(10)
Other Postretirement Benefits Plan | Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	84	68
Regulatory asset	16	24
Prior Service Cost | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	8	9
Prior Service Cost | Pension plans | Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	3	4
Prior Service Cost | Pension plans | Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	5	6
Prior Service Cost | Pension plans | Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	1	1
Prior Service Cost | Pension plans | Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	(4)	(7)
Prior Service Cost | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	11	13
Prior Service Cost | Other Postretirement Benefits Plan | Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	3	4
Prior Service Cost | Other Postretirement Benefits Plan | Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	4	5
Prior Service Cost | Other Postretirement Benefits Plan | Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	1	1
Prior Service Cost | Other Postretirement Benefits Plan | Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	0	0
Net Actuarial Gain (Loss) | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	2,650	2,904
Net Actuarial Gain (Loss) | Pension plans | Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	738	817
Net Actuarial Gain (Loss) | Pension plans | Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	968	1,045
Net Actuarial Gain (Loss) | Pension plans | Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	143	151
Net Actuarial Gain (Loss) | Pension plans | Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	91	100
Net Actuarial Gain (Loss) | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	200	216
Net Actuarial Gain (Loss) | Other Postretirement Benefits Plan | Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	48	52
Net Actuarial Gain (Loss) | Other Postretirement Benefits Plan | Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	68	79
Net Actuarial Gain (Loss) | Other Postretirement Benefits Plan | Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	10	11
Net Actuarial Gain (Loss) | Other Postretirement Benefits Plan | Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	71	64
Regulatory Amortization | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	0	0
Regulatory Amortization | Pension plans | Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	0	0
Regulatory Amortization | Pension plans | Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	0	0
Regulatory Amortization | Pension plans | Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	0	0
Regulatory Amortization | Pension plans | Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	39	50
Regulatory Amortization | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	0	0
Regulatory Amortization | Other Postretirement Benefits Plan | Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	0	0
Regulatory Amortization | Other Postretirement Benefits Plan | Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	0	0
Regulatory Amortization | Other Postretirement Benefits Plan | Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	0	0
Regulatory Amortization | Other Postretirement Benefits Plan | Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Net regulatory assets	$ (13)	$ (4)

RETIREMENT BENEFITS - Changes_2

RETIREMENT BENEFITS - Changes in Regulatory Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 6,523
Total Stockholders' Equity (See accompanying statements)	36,674	$ 35,225	$ 34,532	$ 32,276
Total other comprehensive income (loss)	99	(10)	71
Ending balance	7,041	6,523
Regulatory asset		66	216
Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total Stockholders' Equity (See accompanying statements)	(32)	(56)	(18)	(76)
Total other comprehensive income (loss)	24	(38)	58
Pension plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	2,913
Ending balance	2,658	2,913
Pension plans | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	2,913	2,371
Total Stockholders' Equity (See accompanying statements)	52	79	24
Reclassification adjustments	2	(7)
Total other comprehensive income (loss)	(27)	55
Ending balance	2,658	2,913	2,371
Pension plans | Pension and Other Postretirement Benefit Plans | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(56)	(34)
Total other comprehensive income (loss)	(255)	542
Pension plans | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(29)	62
Reclassification adjustments	1	(8)
Pension plans | Net loss | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(199)	576
Reclassification adjustments	(55)	(33)
Pension plans | Change in prior service costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	1	1
Pension plans | Change in prior service costs | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(1)	(1)
Pension plans | Amortization of regulatory assets | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Other Postretirement Benefits Plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	203
Reclassification adjustments	3	7
Ending balance	189	203
Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(208)	(136)
Total Stockholders' Equity (See accompanying statements)	(14)	(9)	(4)
Total other comprehensive income (loss)	(5)	(5)
Ending balance	(189)	(208)	(136)
Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	11	5
Total other comprehensive income (loss)	19	(72)
Other Postretirement Benefits Plan | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(8)	(12)
Other Postretirement Benefits Plan | Net loss | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(8)	77
Reclassification adjustments	13	6
Other Postretirement Benefits Plan | Change in prior service costs | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(2)	(1)
Other Postretirement Benefits Plan | Amortization of regulatory assets | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Alabama Power
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	2,720
Total other comprehensive income (loss)	2	2	4
Ending balance	2,356	2,720
Regulatory asset	70	76	97
Alabama Power | Pension plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	821
Ending balance	741	821
Alabama Power | Pension plans | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	821	679
Ending balance	741	821	679
Alabama Power | Pension plans | Pension and Other Postretirement Benefit Plans | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(17)	(11)
Total other comprehensive income (loss)	(80)	142
Alabama Power | Pension plans | Net loss | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(63)	153
Reclassification adjustments	(16)	(10)
Alabama Power | Pension plans | Change in prior service costs | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(1)	(1)
Alabama Power | Pension plans | Amortization of regulatory assets | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Alabama Power | Other Postretirement Benefits Plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	48
Ending balance	45	48
Alabama Power | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(48)	(21)
Ending balance	(45)	(48)	(21)
Alabama Power | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	2	3
Total other comprehensive income (loss)	3	(27)
Alabama Power | Other Postretirement Benefits Plan | Net loss | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(1)	30
Reclassification adjustments	3	3
Alabama Power | Other Postretirement Benefits Plan | Change in prior service costs | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(1)	0
Alabama Power | Other Postretirement Benefits Plan | Amortization of regulatory assets | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Georgia Power
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	5,090
Total other comprehensive income (loss)	22	3	28
Ending balance	6,139	5,090
Regulatory asset			83
Georgia Power | Pension plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1,051
Ending balance	973	1,051
Georgia Power | Pension plans | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1,051	887
Ending balance	973	1,051	887
Georgia Power | Pension plans | Pension and Other Postretirement Benefit Plans | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(20)	(14)
Total other comprehensive income (loss)	(78)	164
Georgia Power | Pension plans | Net loss | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(58)	178
Reclassification adjustments	(19)	(13)
Georgia Power | Pension plans | Change in prior service costs | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(1)	(1)
Georgia Power | Pension plans | Amortization of regulatory assets | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Georgia Power | Other Postretirement Benefits Plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	74
Ending balance	64	74
Georgia Power | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(74)	(39)
Ending balance	(64)	(74)	(39)
Georgia Power | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	4	3
Total other comprehensive income (loss)	10	(35)
Georgia Power | Other Postretirement Benefits Plan | Net loss | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(6)	38
Reclassification adjustments	5	4
Georgia Power | Other Postretirement Benefits Plan | Change in prior service costs | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(1)	(1)
Georgia Power | Other Postretirement Benefits Plan | Amortization of regulatory assets | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Mississippi Power
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	90
Total other comprehensive income (loss)	5	0	0
Ending balance	59	90
Regulatory asset	52	44	36
Mississippi Power | Pension plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	152
Ending balance	144	152
Mississippi Power | Pension plans | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	152	123
Ending balance	144	152	123
Mississippi Power | Pension plans | Pension and Other Postretirement Benefit Plans | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(3)	(2)
Total other comprehensive income (loss)	(8)	29
Mississippi Power | Pension plans | Net loss | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(5)	31
Reclassification adjustments	(3)	(2)
Mississippi Power | Pension plans | Change in prior service costs | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Mississippi Power | Pension plans | Amortization of regulatory assets | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Mississippi Power | Other Postretirement Benefits Plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(10)
Ending balance	9	(10)
Mississippi Power | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(10)	(9)
Ending balance	(9)	(10)	(9)
Mississippi Power | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Total other comprehensive income (loss)	1	(1)
Mississippi Power | Other Postretirement Benefits Plan | Net loss | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(1)	1
Reclassification adjustments	0	0
Mississippi Power | Other Postretirement Benefits Plan | Change in prior service costs | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Mississippi Power | Other Postretirement Benefits Plan | Amortization of regulatory assets | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Southern Company Gas
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(2,225)
Total other comprehensive income (loss)	32	(15)	7
Ending balance	(2,252)	(2,225)
Southern Company Gas | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total Stockholders' Equity (See accompanying statements)	51	40	56	38
Total other comprehensive income (loss)	11	(16)	18
Southern Company Gas | Pension plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	143
Ending balance	126	143
Regulatory asset	155	173
Southern Company Gas | Pension plans | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	143	111
Total Stockholders' Equity (See accompanying statements)	(54)	(45)	(75)
Reclassification adjustments	2	1
Total other comprehensive income (loss)	(9)	30
Ending balance	126	143	111
Southern Company Gas | Pension plans | Pension and Other Postretirement Benefit Plans | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(10)	(2)
Total other comprehensive income (loss)	(17)	32
Southern Company Gas | Pension plans | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(11)	29
Reclassification adjustments	0	0
Southern Company Gas | Pension plans | Net loss | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(7)	34
Reclassification adjustments	(1)	0
Southern Company Gas | Pension plans | Change in prior service costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	2	1
Southern Company Gas | Pension plans | Change in prior service costs | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	2	2
Southern Company Gas | Pension plans | Amortization of regulatory assets | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(11)	(4)
Southern Company Gas | Other Postretirement Benefits Plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	68
Reclassification adjustments	0	(8)
Ending balance	84	68
Regulatory asset	16	24
Southern Company Gas | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(68)	(58)
Total Stockholders' Equity (See accompanying statements)	(15)	(10)	(2)
Total other comprehensive income (loss)	(5)	(8)
Ending balance	(84)	(68)	(58)
Southern Company Gas | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(4)	(10)
Total other comprehensive income (loss)	(16)	(10)
Southern Company Gas | Other Postretirement Benefits Plan | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(5)	0
Southern Company Gas | Other Postretirement Benefits Plan | Net loss | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	12	0
Reclassification adjustments	5	0
Southern Company Gas | Other Postretirement Benefits Plan | Change in prior service costs | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Southern Company Gas | Other Postretirement Benefits Plan | Amortization of regulatory assets | Regulatory Assets
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	(9)	(10)
SOUTHERN POWER CO
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total Stockholders' Equity (See accompanying statements)	6,682	6,698	6,916	6,598
Total other comprehensive income (loss)	15	1	10
SOUTHERN POWER CO | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total Stockholders' Equity (See accompanying statements)	(9)	(16)	(9)	$ (29)
Total other comprehensive income (loss)	7	(7)	20
SOUTHERN POWER CO | Pension plans | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total Stockholders' Equity (See accompanying statements)	11	20	11
Reclassification adjustments	0	0
Total other comprehensive income (loss)	(9)	9
SOUTHERN POWER CO | Pension plans | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	(9)	9
Reclassification adjustments	0	0
SOUTHERN POWER CO | Pension plans | Change in prior service costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
SOUTHERN POWER CO | Other Postretirement Benefits Plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
SOUTHERN POWER CO | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total Stockholders' Equity (See accompanying statements)	0	1	$ 0
Total other comprehensive income (loss)	(1)	1
SOUTHERN POWER CO | Other Postretirement Benefits Plan | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain (loss)	$ (1)	$ 1

RETIREMENT BENEFITS - Component

RETIREMENT BENEFITS - Components of Accumulated OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 35,225	$ 34,532	$ 32,276
Total other comprehensive income (loss)	99	(10)	71
Ending balance	36,674	35,225	34,532
Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(56)	(18)	(76)
Total other comprehensive income (loss)	24	(38)	58
Ending balance	(32)	(56)	(18)
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(1)	(1)
Net loss	53	80
AOCI	52	79
Pension plans | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	79	24
Reclassification adjustments	2	(7)
Total other comprehensive income (loss)	(27)	55
Ending balance	52	79	24
Pension plans | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net loss	(29)	62
Reclassification adjustments	1	(8)
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service cost		1
Net loss	(14)	(10)
AOCI	(14)	(9)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	3	7
Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(9)	(4)
Total other comprehensive income (loss)	(5)	(5)
Ending balance	(14)	(9)	(4)
Other Postretirement Benefits Plan | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net loss	(8)	(12)
Southern Power
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	6,698	6,916	6,598
Total other comprehensive income (loss)	15	1	10
Ending balance	6,682	6,698	6,916
Southern Power | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(16)	(9)	(29)
Total other comprehensive income (loss)	7	(7)	20
Ending balance	(9)	(16)	(9)
Southern Power | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	0	0
Net loss	11	20
AOCI	11	20
Southern Power | Pension plans | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	20	11
Reclassification adjustments	0	0
Total other comprehensive income (loss)	(9)	9
Ending balance	11	20	11
Southern Power | Pension plans | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net loss	(9)	9
Reclassification adjustments	0	0
Southern Power | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service cost		0
Net loss	0	1
AOCI	0	1
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	0
Southern Power | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1	0
Total other comprehensive income (loss)	(1)	1
Ending balance	0	1	0
Southern Power | Other Postretirement Benefits Plan | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net loss	(1)	1
Southern Company Gas
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total other comprehensive income (loss)	32	(15)	7
Southern Company Gas | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	40	56	38
Total other comprehensive income (loss)	11	(16)	18
Ending balance	51	40	56
Southern Company Gas | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(1)	(2)
Net loss	(53)	(43)
AOCI	(54)	(45)
Southern Company Gas | Pension plans | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(45)	(75)
Reclassification adjustments	2	1
Total other comprehensive income (loss)	(9)	30
Ending balance	(54)	(45)	(75)
Southern Company Gas | Pension plans | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net loss	(11)	29
Reclassification adjustments	0	0
Southern Company Gas | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service cost		0
Net loss	(15)	(10)
AOCI	(15)	(10)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassification adjustments	0	(8)
Southern Company Gas | Other Postretirement Benefits Plan | Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(10)	(2)
Total other comprehensive income (loss)	(5)	(8)
Ending balance	(15)	(10)	$ (2)
Southern Company Gas | Other Postretirement Benefits Plan | Net loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net loss	$ (5)	$ 0

RETIREMENT BENEFITS - Compone_2

RETIREMENT BENEFITS - Components of Net Periodic Benefit Cost and Estimated Future Benefit Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension plans
Components of net periodic
Service cost	$ 292	$ 275	$ 412
Interest cost	635	626	408
Expected return on plan assets	(1,263)	(1,229)	(1,265)
Recognized net loss(*)	55	32	240
Net amortization(*)	0	0	0
Prior service cost(*)	0	0	0
Total change	(281)	(296)	(205)
Benefit payments:
2025	773
2026	801
2027	823
2028	842
2029	862
2030 to 2034	4,529
Unamortized amounts	20	17	21
Other Postretirement Benefits Plan
Components of net periodic
Service cost	15	15	23
Interest cost	65	70	42
Expected return on plan assets	(89)	(83)	(80)
Prior service cost(*)	(13)	(11)	(1)
Total change	(22)	(9)	(16)
Benefit payments:
2025	112
2026	112
2027	113
2028	114
2029	114
2030 to 2034	558
Unamortized amounts	8
Alabama Power | Pension plans
Components of net periodic
Service cost	68	64	99
Interest cost	148	145	96
Expected return on plan assets	(307)	(297)	(306)
Recognized net loss(*)	16	9	62
Net amortization(*)	1	1	1
Prior service cost(*)	0	0	0
Total change	(74)	(78)	(48)
Benefit payments:
2025	170
2026	177
2027	183
2028	187
2029	192
2030 to 2034	1,013
Alabama Power | Other Postretirement Benefits Plan
Components of net periodic
Service cost	4	4	6
Interest cost	16	17	10
Expected return on plan assets	(35)	(33)	(32)
Prior service cost(*)	(3)	(3)	0
Total change	(18)	(15)	(16)
Benefit payments:
2025	24
2026	25
2027	26
2028	26
2029	27
2030 to 2034	133
Georgia Power | Pension plans
Components of net periodic
Service cost	70	68	103
Interest cost	191	191	123
Expected return on plan assets	(393)	(385)	(399)
Recognized net loss(*)	19	13	75
Net amortization(*)	1	1	1
Prior service cost(*)	0	0	0
Total change	(112)	(112)	(97)
Benefit payments:
2025	245
2026	250
2027	254
2028	258
2029	262
2030 to 2034	1,333
Georgia Power | Other Postretirement Benefits Plan
Components of net periodic
Service cost	4	4	6
Interest cost	23	25	15
Expected return on plan assets	(32)	(29)	(28)
Prior service cost(*)	(4)	(3)	2
Total change	(9)	(3)	(5)
Benefit payments:
2025	40
2026	40
2027	41
2028	41
2029	42
2030 to 2034	205
Mississippi Power | Pension plans
Components of net periodic
Service cost	12	11	17
Interest cost	29	28	18
Expected return on plan assets	(58)	(56)	(57)
Recognized net loss(*)	3	2	11
Net amortization(*)	0	0	0
Prior service cost(*)	0	0	0
Total change	(14)	(15)	(11)
Benefit payments:
2025	34
2026	36
2027	37
2028	38
2029	38
2030 to 2034	204
Mississippi Power | Other Postretirement Benefits Plan
Components of net periodic
Service cost	1	1	1
Interest cost	3	3	2
Expected return on plan assets	(3)	(3)	(2)
Prior service cost(*)	0	0	0
Total change	1	1	1
Benefit payments:
2025	5
2026	5
2027	5
2028	5
2029	5
2030 to 2034	22
Southern Power | Pension plans
Components of net periodic
Service cost	7	6	9
Interest cost	9	8	6
Expected return on plan assets	(17)	(15)	(15)
Recognized net loss(*)	0	0	2
Net amortization(*)	0	0	0
Prior service cost(*)	0	0	0
Total change	(1)	(1)	2
Benefit payments:
2025	7
2026	8
2027	8
2028	7
2029	8
2030 to 2034	51
Southern Power | Other Postretirement Benefits Plan
Components of net periodic
Service cost	0	0	0
Interest cost	0	0	0
Expected return on plan assets	1	1	1
Prior service cost(*)	0	0	0
Total change	1	1	1
Benefit payments:
2025	1
2026	1
2027	1
2028	1
2029	1
2030 to 2034	1
Southern Company Gas | Pension plans
Components of net periodic
Service cost	28	24	34
Interest cost	42	42	28
Expected return on plan assets	(85)	(85)	(91)
Recognized net loss(*)	0	(5)	8
Net amortization(*)	15	15	15
Prior service cost(*)	(3)	(3)	(3)
Total change	(3)	(12)	(9)
Benefit payments:
2025	58
2026	60
2027	62
2028	64
2029	66
2030 to 2034	346
Southern Company Gas | Other Postretirement Benefits Plan
Components of net periodic
Service cost	1	1	1
Interest cost	8	9	5
Expected return on plan assets	(13)	(10)	(9)
Prior service cost(*)	6	6	6
Total change	2	$ 6	$ 3
Benefit payments:
2025	16
2026	16
2027	15
2028	15
2029	14
2030 to 2034	$ 61

RETIREMENT BENEFITS - Fair Valu

RETIREMENT BENEFITS - Fair Values of Pension Plan and Other Postretirement Benefit Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Liabilities:
Target Allocation	100%	100%
Actual Allocation	100%	100%
Pension plans
Assets:
Plan assets	$ 14,621	$ 14,760
Liabilities:
Derivatives	(33)
Total	$ 14,588
Pension plans | Equity
Liabilities:
Target Allocation	41%	41%
Actual Allocation	41%	40%
Pension plans | Domestic equity
Assets:
Plan assets	$ 2,930	$ 2,730
Pension plans | International equity
Assets:
Plan assets	$ 2,991	$ 2,999
Pension plans | Fixed income
Liabilities:
Target Allocation	30%	30%
Actual Allocation	31%	32%
Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 1,780	$ 1,973
Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	48	44
Pension plans | Corporate bonds
Assets:
Plan assets	1,715	1,724
Pension plans | Pooled funds
Assets:
Plan assets	792	777
Pension plans | Cash equivalents and other
Assets:
Plan assets	255	429
Pension plans | Real estate investments
Assets:
Plan assets	$ 1,924	$ 2,053
Liabilities:
Target Allocation	12%	12%
Actual Allocation	13%	14%
Pension plans | Special situations
Assets:
Plan assets	$ 237	$ 245
Liabilities:
Target Allocation	3%	3%
Actual Allocation	2%	2%
Pension plans | Private equity
Assets:
Plan assets	$ 1,797	$ 1,761
Liabilities:
Target Allocation	9%	9%
Actual Allocation	12%	12%
Pension plans | Private Credit
Assets:
Plan assets	$ 152	$ 25
Liabilities:
Target Allocation	3%	3%
Actual Allocation	1%
Pension plans | Infrastructure
Assets:
Plan assets	$ 0
Liabilities:
Target Allocation	2%	2%
Actual Allocation	0%
Other postretirement benefit plans
Assets:
Plan assets	$ 1,139	$ 1,096
Liabilities:
Derivatives	1
Total	$ 1,138
Target Allocation	100%	100%
Actual Allocation	100%	100%
Other postretirement benefit plans | Equity
Liabilities:
Target Allocation	61%	60%
Actual Allocation	62%	61%
Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	$ 192	$ 172
Other postretirement benefit plans | International equity
Assets:
Plan assets	$ 137	$ 135
Other postretirement benefit plans | Fixed income
Liabilities:
Target Allocation	29%	30%
Actual Allocation	28%	28%
Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 54	$ 57
Other postretirement benefit plans | Mortgage- and asset-backed securities
Assets:
Plan assets	1	2
Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	48	47
Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	99	92
Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	16	23
Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	478	456
Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	$ 54	$ 57
Liabilities:
Target Allocation	4%	4%
Actual Allocation	5%	6%
Other postretirement benefit plans | Special situations
Assets:
Plan assets	$ 6	$ 6
Liabilities:
Target Allocation	1%	1%
Actual Allocation	1%	1%
Other postretirement benefit plans | Private equity
Assets:
Plan assets	$ 50	$ 48
Liabilities:
Target Allocation	3%	3%
Actual Allocation	4%	4%
Other postretirement benefit plans | Private Credit
Assets:
Plan assets	$ 4	$ 1
Liabilities:
Target Allocation	1%	1%
Actual Allocation	0%
Other postretirement benefit plans | Infrastructure
Assets:
Plan assets	$ 0
Liabilities:
Target Allocation	1%	1%
Actual Allocation	0%
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans
Assets:
Plan assets	$ 4,670	$ 4,646
Liabilities:
Derivatives	0
Total	4,670
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity
Assets:
Plan assets	2,095	1,959
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity
Assets:
Plan assets	1,959	1,947
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other
Assets:
Plan assets	255	371
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments
Assets:
Plan assets	361	369
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private Credit
Assets:
Plan assets	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Infrastructure
Assets:
Plan assets	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans
Assets:
Plan assets	175	170
Liabilities:
Derivatives	0
Total	175
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	94	85
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | International equity
Assets:
Plan assets	54	53
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	16	21
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	11	11
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private Credit
Assets:
Plan assets	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Infrastructure
Assets:
Plan assets	0
Significant Other Observable Inputs (Level 2) | Pension plans
Assets:
Plan assets	6,202	6,399
Liabilities:
Derivatives	(33)
Total	6,169
Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity
Assets:
Plan assets	835	771
Significant Other Observable Inputs (Level 2) | Pension plans | International equity
Assets:
Plan assets	1,032	1,052
Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	1,780	1,973
Significant Other Observable Inputs (Level 2) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	48	44
Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds
Assets:
Plan assets	1,715	1,724
Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds
Assets:
Plan assets	792	777
Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	58
Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments
Assets:
Plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension plans | Special situations
Assets:
Plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension plans | Private equity
Assets:
Plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension plans | Private Credit
Assets:
Plan assets	0
Significant Other Observable Inputs (Level 2) | Pension plans | Infrastructure
Assets:
Plan assets	0
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans
Assets:
Plan assets	861	825
Liabilities:
Derivatives	1
Total	860
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	98	87
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | International equity
Assets:
Plan assets	83	82
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	54	57
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Mortgage- and asset-backed securities
Assets:
Plan assets	1	2
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	48	47
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	99	92
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	0	2
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	478	456
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	0	0
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	0	0
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	0	0
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private Credit
Assets:
Plan assets	0
Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Infrastructure
Assets:
Plan assets	0
Net Asset Value as a Practical Expedient (NAV) | Pension plans
Assets:
Plan assets	3,749	3,715
Liabilities:
Derivatives	0
Total	3,749
Net Asset Value as a Practical Expedient (NAV) | Pension plans | Domestic equity
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Pension plans | International equity
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Pension plans | Real estate investments
Assets:
Plan assets	1,563	1,684
Net Asset Value as a Practical Expedient (NAV) | Pension plans | Special situations
Assets:
Plan assets	237	245
Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private equity
Assets:
Plan assets	1,797	1,761
Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private Credit
Assets:
Plan assets	152	25
Net Asset Value as a Practical Expedient (NAV) | Pension plans | Infrastructure
Assets:
Plan assets	0
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans
Assets:
Plan assets	103	101
Liabilities:
Derivatives	0
Total	103
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | International equity
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	0	0
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	43	46
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	6	6
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	50	48
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Private Credit
Assets:
Plan assets	4	1
Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Infrastructure
Assets:
Plan assets	$ 0
Alabama Power
Liabilities:
Target Allocation	100%
Actual Allocation	100%
Alabama Power | Pension plans
Assets:
Plan assets	$ 3,555	$ 3,579
Liabilities:
Derivatives	(8)
Total	$ 3,547
Target Allocation	100%	100%
Actual Allocation	100%	100%
Alabama Power | Pension plans | Equity
Liabilities:
Target Allocation	41%	41%
Actual Allocation	41%	40%
Alabama Power | Pension plans | Domestic equity
Assets:
Plan assets	$ 712	$ 663
Alabama Power | Pension plans | International equity
Assets:
Plan assets	$ 727	$ 727
Alabama Power | Pension plans | Fixed income
Liabilities:
Target Allocation	30%	30%
Actual Allocation	31%	32%
Alabama Power | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 433	$ 479
Alabama Power | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	12	11
Alabama Power | Pension plans | Corporate bonds
Assets:
Plan assets	417	418
Alabama Power | Pension plans | Pooled funds
Assets:
Plan assets	193	188
Alabama Power | Pension plans | Cash equivalents and other
Assets:
Plan assets	62	104
Alabama Power | Pension plans | Real estate investments
Assets:
Plan assets	$ 468	$ 497
Liabilities:
Target Allocation	12%	12%
Actual Allocation	13%	14%
Alabama Power | Pension plans | Special situations
Assets:
Plan assets	$ 57	$ 59
Liabilities:
Target Allocation	3%	3%
Actual Allocation	2%	2%
Alabama Power | Pension plans | Private equity
Assets:
Plan assets	$ 437	$ 427
Liabilities:
Target Allocation	9%	9%
Actual Allocation	12%	12%
Alabama Power | Pension plans | Private Credit
Assets:
Plan assets	$ 37	$ 6
Liabilities:
Target Allocation	3%	3%
Actual Allocation	1%
Alabama Power | Pension plans | Infrastructure
Assets:
Plan assets	$ 0
Liabilities:
Target Allocation	2%	2%
Actual Allocation	0%
Alabama Power | Other postretirement benefit plans
Assets:
Plan assets	$ 418	$ 402
Liabilities:
Target Allocation	100%	100%
Actual Allocation	100%	100%
Alabama Power | Other postretirement benefit plans | Equity
Liabilities:
Target Allocation	68%	67%
Actual Allocation	68%	66%
Alabama Power | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	$ 24	$ 22
Alabama Power | Other postretirement benefit plans | International equity
Assets:
Plan assets	$ 25	$ 25
Alabama Power | Other postretirement benefit plans | Fixed income
Liabilities:
Target Allocation	23%	23%
Actual Allocation	24%	23%
Alabama Power | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 14	$ 16
Alabama Power | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	14	14
Alabama Power | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	11	8
Alabama Power | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	2	3
Alabama Power | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	294	280
Alabama Power | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	$ 16	$ 17
Liabilities:
Target Allocation	3%	4%
Actual Allocation	4%	6%
Alabama Power | Other postretirement benefit plans | Special situations
Assets:
Plan assets	$ 2	$ 2
Liabilities:
Target Allocation	1%	1%
Actual Allocation	1%	1%
Alabama Power | Other postretirement benefit plans | Private equity
Assets:
Plan assets	$ 15	$ 15
Liabilities:
Target Allocation	3%	3%
Actual Allocation	3%	4%
Alabama Power | Other postretirement benefit plans | Private Credit
Liabilities:
Target Allocation		1%
Alabama Power | Other postretirement benefit plans | Infrastructure
Liabilities:
Target Allocation		1%
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans
Assets:
Plan assets	$ 1,135	$ 1,127
Liabilities:
Derivatives	0
Total	1,135
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity
Assets:
Plan assets	509	476
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity
Assets:
Plan assets	476	472
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other
Assets:
Plan assets	62	90
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments
Assets:
Plan assets	88	89
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private Credit
Assets:
Plan assets	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Infrastructure
Assets:
Plan assets	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans
Assets:
Plan assets	38	38
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	17	16
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | International equity
Assets:
Plan assets	16	16
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	2	3
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	3	3
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	0	0
Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	0	0
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans
Assets:
Plan assets	1,509	1,552
Liabilities:
Derivatives	(8)
Total	1,501
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity
Assets:
Plan assets	203	187
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | International equity
Assets:
Plan assets	251	255
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	433	479
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	12	11
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds
Assets:
Plan assets	417	418
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds
Assets:
Plan assets	193	188
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	14
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments
Assets:
Plan assets	0	0
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Special situations
Assets:
Plan assets	0	0
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private equity
Assets:
Plan assets	0	0
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private Credit
Assets:
Plan assets	0
Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Infrastructure
Assets:
Plan assets	0
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans
Assets:
Plan assets	349	333
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	7	6
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | International equity
Assets:
Plan assets	9	9
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	14	16
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	14	14
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	11	8
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	0	0
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	294	280
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	0	0
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	0	0
Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans
Assets:
Plan assets	911	900
Liabilities:
Derivatives	0
Total	911
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Domestic equity
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | International equity
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Real estate investments
Assets:
Plan assets	380	408
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Special situations
Assets:
Plan assets	57	59
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private equity
Assets:
Plan assets	437	427
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private Credit
Assets:
Plan assets	37	6
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Infrastructure
Assets:
Plan assets	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans
Assets:
Plan assets	31	31
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | International equity
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	0	0
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	13	14
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	2	2
Alabama Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	$ 15	$ 15
Georgia Power
Liabilities:
Target Allocation	100%	100%
Actual Allocation	100%	100%
Georgia Power | Pension plans
Assets:
Plan assets	$ 4,538	$ 4,615
Liabilities:
Derivatives	(10)
Total	$ 4,528
Target Allocation	100%
Actual Allocation	100%
Georgia Power | Pension plans | Equity
Liabilities:
Target Allocation	41%	41%
Actual Allocation	41%	40%
Georgia Power | Pension plans | Domestic equity
Assets:
Plan assets	$ 911	$ 852
Georgia Power | Pension plans | International equity
Assets:
Plan assets	$ 928	$ 938
Georgia Power | Pension plans | Fixed income
Liabilities:
Target Allocation	30%	30%
Actual Allocation	31%	32%
Georgia Power | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 552	$ 617
Georgia Power | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	15	14
Georgia Power | Pension plans | Corporate bonds
Assets:
Plan assets	532	539
Georgia Power | Pension plans | Pooled funds
Assets:
Plan assets	246	243
Georgia Power | Pension plans | Cash equivalents and other
Assets:
Plan assets	79	134
Georgia Power | Pension plans | Real estate investments
Assets:
Plan assets	$ 597	$ 642
Liabilities:
Target Allocation	12%	12%
Actual Allocation	13%	14%
Georgia Power | Pension plans | Special situations
Assets:
Plan assets	$ 73	$ 77
Liabilities:
Target Allocation	3%	3%
Actual Allocation	2%	2%
Georgia Power | Pension plans | Private equity
Assets:
Plan assets	$ 558	$ 551
Liabilities:
Target Allocation	9%	9%
Actual Allocation	12%	12%
Georgia Power | Pension plans | Private Credit
Assets:
Plan assets	$ 47	$ 8
Liabilities:
Target Allocation	3%	3%
Actual Allocation	1%	0%
Georgia Power | Pension plans | Infrastructure
Assets:
Plan assets	$ 0	$ 0
Liabilities:
Target Allocation	2%	2%
Actual Allocation	0%	0%
Georgia Power | Other postretirement benefit plans
Assets:
Plan assets	$ 420	$ 409
Liabilities:
Target Allocation	100%	100%
Actual Allocation	100%	100%
Georgia Power | Other postretirement benefit plans | Equity
Liabilities:
Target Allocation	59%	58%
Actual Allocation	59%	57%
Georgia Power | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	$ 59	$ 53
Georgia Power | Other postretirement benefit plans | International equity
Assets:
Plan assets	$ 57	$ 56
Georgia Power | Other postretirement benefit plans | Fixed income
Liabilities:
Target Allocation	35%	35%
Actual Allocation	33%	35%
Georgia Power | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 14	$ 16
Georgia Power | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	14	14
Georgia Power | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	48	47
Georgia Power | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	10	13
Georgia Power | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	184	176
Georgia Power | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	$ 17	$ 18
Liabilities:
Target Allocation	3%	3%
Actual Allocation	4%	4%
Georgia Power | Other postretirement benefit plans | Special situations
Assets:
Plan assets	$ 2	$ 2
Liabilities:
Target Allocation	1%	1%
Actual Allocation	1%	1%
Georgia Power | Other postretirement benefit plans | Private equity
Assets:
Plan assets	$ 15	$ 14
Liabilities:
Target Allocation	2%	2%
Actual Allocation	3%	3%
Georgia Power | Other postretirement benefit plans | Private Credit
Assets:
Plan assets		$ 0
Liabilities:
Target Allocation		1%
Actual Allocation		0%
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans
Assets:
Plan assets	$ 1,451	$ 1,451
Liabilities:
Derivatives	0
Total	1,451
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity
Assets:
Plan assets	652	611
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity
Assets:
Plan assets	608	609
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other
Assets:
Plan assets	79	116
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments
Assets:
Plan assets	112	115
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private Credit
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Infrastructure
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans
Assets:
Plan assets	82	80
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	52	47
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | International equity
Assets:
Plan assets	16	16
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	10	13
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	4	4
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	0	0
Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private Credit
Assets:
Plan assets		0
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans
Assets:
Plan assets	1,924	2,001
Liabilities:
Derivatives	(10)
Total	1,914
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity
Assets:
Plan assets	259	241
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | International equity
Assets:
Plan assets	320	329
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	552	617
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	15	14
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds
Assets:
Plan assets	532	539
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds
Assets:
Plan assets	246	243
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	18
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments
Assets:
Plan assets	0	0
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Special situations
Assets:
Plan assets	0	0
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private equity
Assets:
Plan assets	0	0
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private Credit
Assets:
Plan assets	0	0
Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Infrastructure
Assets:
Plan assets	0	0
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans
Assets:
Plan assets	308	299
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	7	6
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | International equity
Assets:
Plan assets	41	40
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	14	16
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	14	14
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	48	47
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	0	0
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	184	176
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	0	0
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	0	0
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	0	0
Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private Credit
Assets:
Plan assets		0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans
Assets:
Plan assets	1,163	1,163
Liabilities:
Derivatives	0
Total	1,163
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Domestic equity
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | International equity
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Real estate investments
Assets:
Plan assets	485	527
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Special situations
Assets:
Plan assets	73	77
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private equity
Assets:
Plan assets	558	551
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private Credit
Assets:
Plan assets	47	8
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Infrastructure
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans
Assets:
Plan assets	30	30
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | International equity
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Trust-owned life insurance
Assets:
Plan assets	0	0
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	13	14
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	2	2
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	$ 15	14
Georgia Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Private Credit
Assets:
Plan assets		0
Mississippi Power
Liabilities:
Target Allocation	100%
Actual Allocation	100%
Mississippi Power | Pension plans
Assets:
Plan assets	$ 667	$ 675
Liabilities:
Derivatives	(2)
Total	$ 665
Target Allocation	100%	100%
Actual Allocation	100%	100%
Mississippi Power | Pension plans | Equity
Liabilities:
Target Allocation	41%	41%
Actual Allocation	41%	40%
Mississippi Power | Pension plans | Domestic equity
Assets:
Plan assets	$ 135	$ 124
Mississippi Power | Pension plans | International equity
Assets:
Plan assets	$ 136	$ 137
Mississippi Power | Pension plans | Fixed income
Liabilities:
Target Allocation	30%	30%
Actual Allocation	31%	32%
Mississippi Power | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 81	$ 90
Mississippi Power | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	2	2
Mississippi Power | Pension plans | Corporate bonds
Assets:
Plan assets	78	79
Mississippi Power | Pension plans | Pooled funds
Assets:
Plan assets	36	36
Mississippi Power | Pension plans | Cash equivalents and other
Assets:
Plan assets	12	20
Mississippi Power | Pension plans | Real estate investments
Assets:
Plan assets	$ 87	$ 94
Liabilities:
Target Allocation	12%	12%
Actual Allocation	13%	14%
Mississippi Power | Pension plans | Special situations
Assets:
Plan assets	$ 11	$ 11
Liabilities:
Target Allocation	3%	3%
Actual Allocation	2%	2%
Mississippi Power | Pension plans | Private equity
Assets:
Plan assets	$ 82	$ 81
Liabilities:
Target Allocation	9%	9%
Actual Allocation	12%	12%
Mississippi Power | Pension plans | Private Credit
Assets:
Plan assets	$ 7	$ 1
Liabilities:
Target Allocation	3%	3%
Actual Allocation	1%	0%
Mississippi Power | Pension plans | Infrastructure
Assets:
Plan assets	$ 0	$ 0
Liabilities:
Target Allocation	2%	2%
Actual Allocation	0%	0%
Mississippi Power | Other postretirement benefit plans
Assets:
Plan assets	$ 23	$ 24
Liabilities:
Target Allocation	100%	100%
Actual Allocation	100%	100%
Mississippi Power | Other postretirement benefit plans | Equity
Liabilities:
Target Allocation	34%	34%
Actual Allocation	32%	33%
Mississippi Power | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	$ 4	$ 4
Mississippi Power | Other postretirement benefit plans | International equity
Assets:
Plan assets	$ 4	$ 4
Mississippi Power | Other postretirement benefit plans | Fixed income
Liabilities:
Target Allocation	43%	43%
Actual Allocation	44%	44%
Mississippi Power | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 7	$ 7
Mississippi Power | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	2	2
Mississippi Power | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	1	1
Mississippi Power | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	1	1
Mississippi Power | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	$ 2	$ 3
Liabilities:
Target Allocation	10%	10%
Actual Allocation	11%	11%
Mississippi Power | Other postretirement benefit plans | Special situations
Assets:
Plan assets	$ 0	$ 0
Liabilities:
Target Allocation	2%	2%
Actual Allocation	2%	2%
Mississippi Power | Other postretirement benefit plans | Private equity
Assets:
Plan assets	$ 2	$ 2
Liabilities:
Target Allocation	7%	7%
Actual Allocation	10%	10%
Mississippi Power | Other postretirement benefit plans | Private Credit
Liabilities:
Target Allocation		3%
Mississippi Power | Other postretirement benefit plans | Infrastructure
Liabilities:
Target Allocation		1%
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans
Assets:
Plan assets	$ 214	$ 212
Liabilities:
Derivatives	0
Total	214
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity
Assets:
Plan assets	97	89
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity
Assets:
Plan assets	89	89
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other
Assets:
Plan assets	12	17
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments
Assets:
Plan assets	16	17
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private Credit
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Infrastructure
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans
Assets:
Plan assets	7	8
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	3	3
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | International equity
Assets:
Plan assets	3	3
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	1	1
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	0	1
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	0	0
Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	0	0
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans
Assets:
Plan assets	282	293
Liabilities:
Derivatives	(2)
Total	280
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity
Assets:
Plan assets	38	35
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | International equity
Assets:
Plan assets	47	48
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	81	90
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	2	2
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds
Assets:
Plan assets	78	79
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds
Assets:
Plan assets	36	36
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	3
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments
Assets:
Plan assets	0	0
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Special situations
Assets:
Plan assets	0	0
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private equity
Assets:
Plan assets	0	0
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private Credit
Assets:
Plan assets	0	0
Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Infrastructure
Assets:
Plan assets	0	0
Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans
Assets:
Plan assets	12	12
Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	1	1
Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | International equity
Assets:
Plan assets	1	1
Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	7	7
Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	2	2
Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	1	1
Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	0	0
Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	0	0
Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	0	0
Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans
Assets:
Plan assets	171	170
Liabilities:
Derivatives	0
Total	171
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Domestic equity
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | International equity
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Real estate investments
Assets:
Plan assets	71	77
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Special situations
Assets:
Plan assets	11	11
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private equity
Assets:
Plan assets	82	81
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private Credit
Assets:
Plan assets	7	1
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Infrastructure
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans
Assets:
Plan assets	4	4
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | International equity
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	2	2
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Special situations
Assets:
Plan assets	0	0
Mississippi Power | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	2	2
Southern Power | Pension plans
Assets:
Plan assets	$ 188	$ 187
Liabilities:
Target Allocation	100%	100%
Actual Allocation	100%	100%
Southern Power | Pension plans | Equity
Liabilities:
Target Allocation	41%	41%
Actual Allocation	41%	40%
Southern Power | Pension plans | Domestic equity
Assets:
Plan assets	$ 38	$ 34
Southern Power | Pension plans | International equity
Assets:
Plan assets	$ 38	$ 38
Southern Power | Pension plans | Fixed income
Liabilities:
Target Allocation	30%	30%
Actual Allocation	31%	32%
Southern Power | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 23	$ 25
Southern Power | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	1	1
Southern Power | Pension plans | Corporate bonds
Assets:
Plan assets	22	22
Southern Power | Pension plans | Pooled funds
Assets:
Plan assets	10	10
Southern Power | Pension plans | Cash equivalents and other
Assets:
Plan assets	3	6
Southern Power | Pension plans | Real estate investments
Assets:
Plan assets	$ 25	$ 26
Liabilities:
Target Allocation	12%	12%
Actual Allocation	13%	14%
Southern Power | Pension plans | Special situations
Assets:
Plan assets	$ 3	$ 3
Liabilities:
Target Allocation	3%	3%
Actual Allocation	2%	2%
Southern Power | Pension plans | Private equity
Assets:
Plan assets	$ 23	$ 22
Liabilities:
Target Allocation	9%	9%
Actual Allocation	12%	12%
Southern Power | Pension plans | Private Credit
Assets:
Plan assets	$ 2	$ 0
Liabilities:
Target Allocation	3%	3%
Actual Allocation	1%	0%
Southern Power | Pension plans | Infrastructure
Assets:
Plan assets	$ 0	$ 0
Liabilities:
Target Allocation	2%	2%
Actual Allocation	0%	0%
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans
Assets:
Plan assets	$ 60	$ 59
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity
Assets:
Plan assets	27	24
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity
Assets:
Plan assets	25	25
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other
Assets:
Plan assets	3	5
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments
Assets:
Plan assets	5	5
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations
Assets:
Plan assets	0	0
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity
Assets:
Plan assets	0	0
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private Credit
Assets:
Plan assets	0	0
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Infrastructure
Assets:
Plan assets	0	0
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans
Assets:
Plan assets	80	82
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity
Assets:
Plan assets	11	10
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | International equity
Assets:
Plan assets	13	13
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	23	25
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	1	1
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds
Assets:
Plan assets	22	22
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds
Assets:
Plan assets	10	10
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	1
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments
Assets:
Plan assets	0	0
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Special situations
Assets:
Plan assets	0	0
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private equity
Assets:
Plan assets	0	0
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private Credit
Assets:
Plan assets	0	0
Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Infrastructure
Assets:
Plan assets	0	0
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans
Assets:
Plan assets	48	46
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Domestic equity
Assets:
Plan assets	0	0
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | International equity
Assets:
Plan assets	0	0
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	0
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Real estate investments
Assets:
Plan assets	20	21
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Special situations
Assets:
Plan assets	3	3
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private equity
Assets:
Plan assets	23	22
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private Credit
Assets:
Plan assets	2	0
Southern Power | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Infrastructure
Assets:
Plan assets	0	0
Southern Company Gas | Pension plans
Assets:
Plan assets	$ 983	$ 989
Liabilities:
Target Allocation	100%	100%
Actual Allocation	100%	100%
Southern Company Gas | Pension plans | Equity
Liabilities:
Target Allocation	41%	41%
Actual Allocation	41%	40%
Southern Company Gas | Pension plans | Domestic equity
Assets:
Plan assets	$ 198	$ 182
Southern Company Gas | Pension plans | International equity
Assets:
Plan assets	$ 201	$ 201
Southern Company Gas | Pension plans | Fixed income
Liabilities:
Target Allocation	30%	30%
Actual Allocation	31%	32%
Southern Company Gas | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 120	$ 132
Southern Company Gas | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	3	3
Southern Company Gas | Pension plans | Corporate bonds
Assets:
Plan assets	115	116
Southern Company Gas | Pension plans | Pooled funds
Assets:
Plan assets	53	52
Southern Company Gas | Pension plans | Cash equivalents and other
Assets:
Plan assets	17	29
Southern Company Gas | Pension plans | Real estate investments
Assets:
Plan assets	$ 129	$ 138
Liabilities:
Target Allocation	12%	12%
Actual Allocation	13%	14%
Southern Company Gas | Pension plans | Special situations
Assets:
Plan assets	$ 16	$ 16
Liabilities:
Target Allocation	3%	3%
Actual Allocation	2%	2%
Southern Company Gas | Pension plans | Private equity
Assets:
Plan assets	$ 121	$ 118
Liabilities:
Target Allocation	9%	9%
Actual Allocation	12%	12%
Southern Company Gas | Pension plans | Private Credit
Assets:
Plan assets	$ 10	$ 2
Liabilities:
Target Allocation	3%	3%
Actual Allocation	1%
Southern Company Gas | Pension plans | Infrastructure
Assets:
Plan assets	$ 0
Liabilities:
Target Allocation	2%	2%
Actual Allocation	0%
Southern Company Gas | Other postretirement benefit plans
Assets:
Plan assets	$ 138	$ 127
Liabilities:
Target Allocation	100%	100%
Actual Allocation	100%	100%
Southern Company Gas | Other postretirement benefit plans | Equity
Liabilities:
Target Allocation	72%	72%
Actual Allocation	73%	72%
Southern Company Gas | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	$ 77	$ 69
Southern Company Gas | Other postretirement benefit plans | International equity
Assets:
Plan assets	$ 24	$ 24
Southern Company Gas | Other postretirement benefit plans | Fixed income
Liabilities:
Target Allocation	26%	26%
Actual Allocation	25%	26%
Southern Company Gas | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	$ 1	$ 1
Southern Company Gas | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	1	1
Southern Company Gas | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	32	29
Southern Company Gas | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	1	1
Southern Company Gas | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	$ 1	$ 1
Liabilities:
Target Allocation	1%	1%
Actual Allocation	1%	1%
Southern Company Gas | Other postretirement benefit plans | Private equity
Assets:
Plan assets	$ 1	$ 1
Liabilities:
Target Allocation	1%	1%
Actual Allocation	1%	1%
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans
Assets:
Plan assets	$ 315	$ 310
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity
Assets:
Plan assets	142	130
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity
Assets:
Plan assets	132	130
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other
Assets:
Plan assets	17	25
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments
Assets:
Plan assets	24	25
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations
Assets:
Plan assets	0	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity
Assets:
Plan assets	0	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private Credit
Assets:
Plan assets	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Infrastructure
Assets:
Plan assets	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans
Assets:
Plan assets	3	5
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	1	2
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | International equity
Assets:
Plan assets	1	2
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	0	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	0	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	1	1
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	0	0
Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	0	0
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans
Assets:
Plan assets	416	430
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity
Assets:
Plan assets	56	52
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | International equity
Assets:
Plan assets	69	71
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	120	132
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	3	3
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds
Assets:
Plan assets	115	116
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds
Assets:
Plan assets	53	52
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	4
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments
Assets:
Plan assets	0	0
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Special situations
Assets:
Plan assets	0	0
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Private equity
Assets:
Plan assets	0	0
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Private Credit
Assets:
Plan assets	0
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Infrastructure
Assets:
Plan assets	0
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans
Assets:
Plan assets	133	120
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	76	67
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | International equity
Assets:
Plan assets	23	22
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	1	1
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	1	1
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	32	29
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	0	0
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	0	0
Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans
Assets:
Plan assets	252	249
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Domestic equity
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | International equity
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Mortgage- and asset-backed securities
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Corporate bonds
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Pooled funds
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Cash equivalents and other
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Real estate investments
Assets:
Plan assets	105	113
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Special situations
Assets:
Plan assets	16	16
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private equity
Assets:
Plan assets	121	118
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Private Credit
Assets:
Plan assets	10	2
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Pension plans | Infrastructure
Assets:
Plan assets	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans
Assets:
Plan assets	2	2
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Domestic equity
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | International equity
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Corporate bonds
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Pooled funds
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Cash equivalents and other
Assets:
Plan assets	0	0
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Real estate investments
Assets:
Plan assets	1	1
Southern Company Gas | Net Asset Value as a Practical Expedient (NAV) | Other postretirement benefit plans | Private equity
Assets:
Plan assets	$ 1	$ 1

RETIREMENT BENEFITS - 401K Plan

RETIREMENT BENEFITS - 401K Plan Matching Contributions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	$ 137	$ 131	$ 124
Alabama Power
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	29	28	26
Georgia Power
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	31	31	29
Mississippi Power
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	5	5	5
Southern Power
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	3	3	3
Southern Company Gas
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	$ 20	$ 18	$ 17

STOCK COMPENSATION - Schedule o

STOCK COMPENSATION - Schedule of Employees Participating in Stock-Based Compensation Programs (Details)	Dec. 31, 2024 employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees	1,154
Alabama Power
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees	158
Georgia Power
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees	161
Mississippi Power
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees	36
Southern Power
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees	36
Southern Company Gas
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees	183

STOCK COMPENSATION - Performanc

STOCK COMPENSATION - Performance Shares Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended			12 Months Ended
	Feb. 19, 2025 $ / shares shares	Feb. 29, 2024 shares	Feb. 28, 2023 $ / shares	Dec. 31, 2024 USD ($) type $ / shares shares	Dec. 31, 2023 $ / shares shares	Dec. 31, 2022 $ / shares
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of performance share units issued under performance share plan				3 years	3 years
Minimum percentage of transfer performance shares to common stock based on actual total shareholder return				0%
Maximum percentage of transfer performance shares to common stock based on actual total shareholder return				200%
Number of types of PSUs | type				2
Performance share units, unvested (in shares)				2.3	2.4
Shares issued (in shares)		2.3
Share price (in USD per share) | $ / shares			$ 66.95
Equity instrument, granted (in shares)				1.1
Equity instruments, vested (in shares)				1.2
Unrecognized compensation cost | $				$ 33
Total unrecognized compensation cost related to award, weighted average period				19 months
Performance Shares | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)	2
Share price (in USD per share) | $ / shares	$ 83.87
EPS-based and ROE-based Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of performance share units issued under performance share plan				3 years
Equity instrument granted in period, weighted average grant date fair value (in dollars per share) | $ / shares				$ 69.67	$ 68.93	$ 66.87

STOCK COMPENSATION - Performa_2

STOCK COMPENSATION - Performance Shares, Assumptions Used (Details) - Performance Shares - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	19.10%	30%	29.60%
Interest rate	4%	3.80%	1.70%
Weighted average grant-date fair value (in dollars per share)	$ 80.99	$ 76.83	$ 79.69

STOCK COMPENSATION - Performa_3

STOCK COMPENSATION - Performance Shares, Compensation Costs and Related Tax Benefit (Details) - Performance Shares - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized in income	$ 102	$ 107	$ 101
Tax benefit of compensation cost recognized in income	$ 27	$ 28	$ 26

STOCK COMPENSATION - Restricted

STOCK COMPENSATION - Restricted Stock Units Narrative (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instrument granted in period, weighted average grant date fair value (in dollars per share)	$ 70.49	$ 68.95	$ 67.20
Award requisite service period	3 years
Total unrecognized compensation cost related to award, weighted average period	19 months
Restricted stock units, unvested (in shares)	0.9	0.9
Equity instrument, granted (in shares)	0.5
Vested or forfeited (in shares)	0.5
Total compensation cost for award recognized in income	$ 30	$ 30	$ 26
Total compensation cost for award recognized in income, tax benefit	$ 8	$ 8	$ 7
One-year vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to award, weighted average period	1 year
Two-year vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to award, weighted average period	2 years
Three-year vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to award, weighted average period	3 years

STOCK COMPENSATION - Stock Opti

STOCK COMPENSATION - Stock Options Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from issuance related to option exercise	$ 14	$ 28	$ 75

STOCK COMPENSATION - Aggregate

STOCK COMPENSATION - Aggregate Intrinsic Value for Options Exercised (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Intrinsic value of options exercised	$ 10	$ 18	$ 49
Tax benefit of options exercised	$ 2	$ 4	$ 12

FAIR VALUE MEASUREMENTS - Asset

FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Assets:
Derivative asset	$ 45	$ 32
Liabilities:
Derivative liability	554	659
Collateral already posted, aggregate fair value	17	62
Recurring
Assets:
Cash equivalents and restricted cash	552	268
Other investments	48	44
Total	3,349	2,806
Liabilities:
Contingent consideration	19	19
Other	24
Total	659	776
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents and restricted cash	533	253
Other investments	9	9
Total	1,594	1,238
Liabilities:
Contingent consideration	3	3
Other	0
Total	8	49
Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents and restricted cash	19	15
Other investments	31	27
Total	1,557	1,382
Liabilities:
Contingent consideration	0	0
Other	13
Total	624	711
Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents and restricted cash	0	0
Other investments	8	8
Total	8	8
Liabilities:
Contingent consideration	16	16
Other	11
Total	27	16
Recurring | Fair Value Measured at Net Asset Value Per Share (NAV)
Assets:
Total	190	178
Alabama Power
Assets:
Derivative asset	7	5
Liabilities:
Derivative liability	23	100
Collateral already posted, aggregate fair value	0
Alabama Power | Recurring
Assets:
Cash equivalents and restricted cash	353	134
Other investments	31	27
Total	1,795	1,435
Alabama Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents and restricted cash	334	119
Other investments	0	0
Total	952	715
Alabama Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents and restricted cash	19	15
Other investments	31	27
Total	653	542
Alabama Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents and restricted cash	0	0
Other investments	0	0
Total	0	0
Alabama Power | Recurring | Fair Value Measured at Net Asset Value Per Share (NAV)
Assets:
Total	190	178
Georgia Power
Assets:
Derivative asset	4	2
Liabilities:
Derivative liability	27	113
Georgia Power | Recurring
Assets:
Cash equivalents and restricted cash	35
Total	1,290	1,176
Georgia Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents and restricted cash	35
Total	453	371
Georgia Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents and restricted cash	0
Total	837	805
Georgia Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents and restricted cash	0
Total	0	0
Mississippi Power
Assets:
Derivative asset	2	1
Liabilities:
Derivative liability	17	47
Mississippi Power | Recurring
Assets:
Cash equivalents and restricted cash		17
Total		32
Mississippi Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents and restricted cash		17
Total		17
Mississippi Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents and restricted cash		0
Total		15
Mississippi Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents and restricted cash		0
Total		0
Southern Power
Assets:
Derivative asset	4	3
Liabilities:
Derivative liability	51	27
Other		13
Collateral already posted, aggregate fair value	0
Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Other		0
Southern Power | Significant Other Observable Inputs (Level 2)
Liabilities:
Other		13
Southern Power | Significant Unobservable Inputs (Level 3)
Liabilities:
Other		0
Southern Power | Recurring
Assets:
Cash equivalents and restricted cash	51
Total	55
Liabilities:
Contingent consideration	19
Other	24
Total	94	59
Southern Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents and restricted cash	51
Total	51
Liabilities:
Contingent consideration	3
Other	0
Total	3	3
Southern Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents and restricted cash	0
Total	4
Liabilities:
Contingent consideration	0
Other	13
Total	64	40
Southern Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents and restricted cash	0
Total	0
Liabilities:
Contingent consideration	16
Other	11
Total	27	16
Southern Company Gas
Assets:
Derivative asset	28	21
Liabilities:
Derivative liability	84	87
Collateral already posted, aggregate fair value	17	62
Southern Company Gas | Recurring
Assets:
Cash equivalents and restricted cash	22
Total	82	26
Liabilities:
Total	95	137
Southern Company Gas | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents and restricted cash	22
Total	38	9
Liabilities:
Total	5	46
Southern Company Gas | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents and restricted cash	0
Total	44	17
Liabilities:
Total	90	91
Southern Company Gas | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents and restricted cash	0
Total	0	0
Liabilities:
Total	0	0
Energy-related derivatives | Recurring
Assets:
Derivative asset	89	55
Liabilities:
Derivative liability	129	358
Energy-related derivatives | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivative asset	12	6
Liabilities:
Derivative liability	5	46
Energy-related derivatives | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Derivative asset	77	49
Liabilities:
Derivative liability	124	312
Energy-related derivatives | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Energy-related derivatives | Alabama Power | Recurring
Assets:
Derivative asset	26	15
Liabilities:
Derivative liability	42	110
Energy-related derivatives | Alabama Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Energy-related derivatives | Alabama Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Derivative asset	26	15
Liabilities:
Derivative liability	42	110
Energy-related derivatives | Alabama Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Energy-related derivatives | Georgia Power | Recurring
Assets:
Derivative asset	19	13
Liabilities:
Derivative liability	42	124
Energy-related derivatives | Georgia Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Energy-related derivatives | Georgia Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Derivative asset	19	13
Liabilities:
Derivative liability	42	124
Energy-related derivatives | Georgia Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Energy-related derivatives | Mississippi Power | Recurring
Assets:
Derivative asset	19	15
Liabilities:
Derivative liability	34	61
Energy-related derivatives | Mississippi Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Energy-related derivatives | Mississippi Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Derivative asset	19	15
Liabilities:
Derivative liability	34	61
Energy-related derivatives | Mississippi Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Energy-related derivatives | Southern Power | Recurring
Assets:
Derivative asset	4	3
Liabilities:
Derivative liability		5
Energy-related derivatives | Southern Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability		0
Energy-related derivatives | Southern Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Derivative asset	4	3
Liabilities:
Derivative liability		5
Energy-related derivatives | Southern Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability		0
Energy-related derivatives | Southern Company Gas | Recurring
Assets:
Derivative asset	21	9
Liabilities:
Derivative liability	11	58
Energy-related derivatives | Southern Company Gas | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivative asset	12	6
Liabilities:
Derivative liability	5	46
Energy-related derivatives | Southern Company Gas | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Derivative asset	9	3
Liabilities:
Derivative liability	6	12
Energy-related derivatives | Southern Company Gas | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Interest rate derivatives | Recurring
Liabilities:
Derivative liability	269	264
Interest rate derivatives | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Derivative liability	0	0
Interest rate derivatives | Recurring | Significant Other Observable Inputs (Level 2)
Liabilities:
Derivative liability	269	264
Interest rate derivatives | Recurring | Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liability	0	0
Interest rate derivatives | Southern Company Gas | Recurring
Liabilities:
Derivative liability	84	79
Interest rate derivatives | Southern Company Gas | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Derivative liability	0	0
Interest rate derivatives | Southern Company Gas | Recurring | Significant Other Observable Inputs (Level 2)
Liabilities:
Derivative liability	84	79
Interest rate derivatives | Southern Company Gas | Recurring | Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liability	0	0
Foreign currency derivatives | Recurring
Liabilities:
Derivative liability	218	122
Foreign currency derivatives | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Derivative liability	0	0
Foreign currency derivatives | Recurring | Significant Other Observable Inputs (Level 2)
Liabilities:
Derivative liability	218	122
Foreign currency derivatives | Recurring | Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liability	0	0
Foreign currency derivatives | Southern Power | Recurring
Liabilities:
Derivative liability	51	22
Contingent consideration		19
Foreign currency derivatives | Southern Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Derivative liability	0	0
Contingent consideration		3
Foreign currency derivatives | Southern Power | Recurring | Significant Other Observable Inputs (Level 2)
Liabilities:
Derivative liability	51	22
Contingent consideration		0
Foreign currency derivatives | Southern Power | Recurring | Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liability	0	0
Contingent consideration		16
Domestic equity | Recurring
Assets:
Nuclear decommissioning trusts	1,099	980
Domestic equity | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	849	764
Domestic equity | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	250	216
Domestic equity | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Domestic equity | Alabama Power | Recurring
Assets:
Nuclear decommissioning trusts	700	651
Domestic equity | Alabama Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	459	443
Domestic equity | Alabama Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	241	208
Domestic equity | Alabama Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Domestic equity | Georgia Power | Recurring
Assets:
Nuclear decommissioning trusts	391	322
Domestic equity | Georgia Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	390	321
Domestic equity | Georgia Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	1	1
Domestic equity | Georgia Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Domestic equity | Southern Company Gas | Recurring
Assets:
Non-qualified deferred compensation trusts	8	7
Domestic equity | Southern Company Gas | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Non-qualified deferred compensation trusts	0	0
Domestic equity | Southern Company Gas | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Non-qualified deferred compensation trusts	8	7
Domestic equity | Southern Company Gas | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Non-qualified deferred compensation trusts	0	0
Foreign equity | Recurring
Assets:
Nuclear decommissioning trusts	323	316
Foreign equity | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	148	145
Foreign equity | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	175	171
Foreign equity | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Foreign equity | Alabama Power | Recurring
Assets:
Nuclear decommissioning trusts	148	145
Foreign equity | Alabama Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	148	145
Foreign equity | Alabama Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	0	0
Foreign equity | Alabama Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Foreign equity | Georgia Power | Recurring
Assets:
Nuclear decommissioning trusts	174	170
Foreign equity | Georgia Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Foreign equity | Georgia Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	174	170
Foreign equity | Georgia Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Foreign equity | Southern Company Gas | Recurring
Assets:
Non-qualified deferred compensation trusts	1	1
Foreign equity | Southern Company Gas | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Non-qualified deferred compensation trusts	0	0
Foreign equity | Southern Company Gas | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Non-qualified deferred compensation trusts	1	1
Foreign equity | Southern Company Gas | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Non-qualified deferred compensation trusts	0	0
U.S. Treasury and government agency securities | Recurring
Assets:
Nuclear decommissioning trusts	371	369
Investments, available for sale:	9
U.S. Treasury and government agency securities | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Investments, available for sale:	2
U.S. Treasury and government agency securities | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	371	369
Investments, available for sale:	7
U.S. Treasury and government agency securities | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Investments, available for sale:	0
U.S. Treasury and government agency securities | Alabama Power | Recurring
Assets:
Nuclear decommissioning trusts	16	20
U.S. Treasury and government agency securities | Alabama Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
U.S. Treasury and government agency securities | Alabama Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	16	20
U.S. Treasury and government agency securities | Alabama Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
U.S. Treasury and government agency securities | Georgia Power | Recurring
Assets:
Nuclear decommissioning trusts	355	349
U.S. Treasury and government agency securities | Georgia Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
U.S. Treasury and government agency securities | Georgia Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	355	349
U.S. Treasury and government agency securities | Georgia Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
U.S. Treasury and government agency securities | Southern Company Gas | Recurring
Assets:
Investments, available for sale:	9
U.S. Treasury and government agency securities | Southern Company Gas | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments, available for sale:	2
U.S. Treasury and government agency securities | Southern Company Gas | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Investments, available for sale:	7
U.S. Treasury and government agency securities | Southern Company Gas | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Investments, available for sale:	0
Municipal bonds | Recurring
Assets:
Nuclear decommissioning trusts	47	48
Municipal bonds | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Municipal bonds | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	47	48
Municipal bonds | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Municipal bonds | Alabama Power | Recurring
Assets:
Nuclear decommissioning trusts	1	1
Municipal bonds | Alabama Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Municipal bonds | Alabama Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	1	1
Municipal bonds | Alabama Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Municipal bonds | Georgia Power | Recurring
Assets:
Nuclear decommissioning trusts	46	47
Municipal bonds | Georgia Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Municipal bonds | Georgia Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	46	47
Municipal bonds | Georgia Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Pooled funds – fixed income | Recurring
Assets:
Nuclear decommissioning trusts	7	6
Pooled funds – fixed income | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Pooled funds – fixed income | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	7	6
Pooled funds – fixed income | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Pooled funds – fixed income | Southern Company Gas | Recurring
Assets:
Non-qualified deferred compensation trusts	7	6
Pooled funds – fixed income | Southern Company Gas | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Non-qualified deferred compensation trusts	0	0
Pooled funds – fixed income | Southern Company Gas | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Non-qualified deferred compensation trusts	7	6
Pooled funds – fixed income | Southern Company Gas | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Non-qualified deferred compensation trusts	0	0
Corporate bonds | Recurring
Assets:
Nuclear decommissioning trusts	452	389
Investments, available for sale:	3
Corporate bonds | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Investments, available for sale:	1
Corporate bonds | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	452	389
Investments, available for sale:	2
Corporate bonds | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Investments, available for sale:	0
Corporate bonds | Alabama Power | Recurring
Assets:
Nuclear decommissioning trusts	287	231
Corporate bonds | Alabama Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Corporate bonds | Alabama Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	287	231
Corporate bonds | Alabama Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Corporate bonds | Georgia Power | Recurring
Assets:
Nuclear decommissioning trusts	165	158
Corporate bonds | Georgia Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Corporate bonds | Georgia Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	165	158
Corporate bonds | Georgia Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Corporate bonds | Southern Company Gas | Recurring
Assets:
Investments, available for sale:	3
Corporate bonds | Southern Company Gas | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments, available for sale:	1
Corporate bonds | Southern Company Gas | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Investments, available for sale:	2
Corporate bonds | Southern Company Gas | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Investments, available for sale:	0
Mortgage and asset backed securities | Recurring
Assets:
Nuclear decommissioning trusts	106	89
Investments, available for sale:	10
Mortgage and asset backed securities | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Investments, available for sale:	0
Mortgage and asset backed securities | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	106	89
Investments, available for sale:	10
Mortgage and asset backed securities | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Investments, available for sale:	0
Mortgage and asset backed securities | Alabama Power | Recurring
Assets:
Nuclear decommissioning trusts	31	25
Mortgage and asset backed securities | Alabama Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Mortgage and asset backed securities | Alabama Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	31	25
Mortgage and asset backed securities | Alabama Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Mortgage and asset backed securities | Georgia Power | Recurring
Assets:
Nuclear decommissioning trusts	75	64
Mortgage and asset backed securities | Georgia Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Mortgage and asset backed securities | Georgia Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	75	64
Mortgage and asset backed securities | Georgia Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Mortgage and asset backed securities | Southern Company Gas | Recurring
Assets:
Investments, available for sale:	10
Mortgage and asset backed securities | Southern Company Gas | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments, available for sale:	0
Mortgage and asset backed securities | Southern Company Gas | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Investments, available for sale:	10
Mortgage and asset backed securities | Southern Company Gas | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Investments, available for sale:	0
Private equity | Recurring
Assets:
Nuclear decommissioning trusts	181	169
Private equity | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Private equity | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	0	0
Private equity | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Private equity | Recurring | Fair Value Measured at Net Asset Value Per Share (NAV)
Assets:
Nuclear decommissioning trusts	181	169
Private equity | Alabama Power | Recurring
Assets:
Nuclear decommissioning trusts	181	169
Private equity | Alabama Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	0	0
Private equity | Alabama Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	0	0
Private equity | Alabama Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Private equity | Alabama Power | Recurring | Fair Value Measured at Net Asset Value Per Share (NAV)
Assets:
Nuclear decommissioning trusts	181	169
Cash and cash equivalents | Recurring
Assets:
Nuclear decommissioning trusts	1	3
Cash and cash equivalents | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	1	3
Cash and cash equivalents | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	0	0
Cash and cash equivalents | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Other | Recurring
Assets:
Nuclear decommissioning trusts	51	70
Other | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	39	58
Other | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	3	3
Other | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Other | Recurring | Fair Value Measured at Net Asset Value Per Share (NAV)
Assets:
Nuclear decommissioning trusts	9	9
Other | Alabama Power | Recurring
Assets:
Nuclear decommissioning trusts	21	17
Other | Alabama Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	11	8
Other | Alabama Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	1	0
Other | Alabama Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Other | Alabama Power | Recurring | Fair Value Measured at Net Asset Value Per Share (NAV)
Assets:
Nuclear decommissioning trusts	9	9
Other | Georgia Power | Recurring
Assets:
Nuclear decommissioning trusts	30	53
Other | Georgia Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Nuclear decommissioning trusts	28	50
Other | Georgia Power | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Nuclear decommissioning trusts	2	3
Other | Georgia Power | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Nuclear decommissioning trusts	0	0
Other | Southern Power | Recurring
Liabilities:
Derivative liability		13
Other | Southern Power | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Derivative liability		0
Other | Southern Power | Recurring | Significant Other Observable Inputs (Level 2)
Liabilities:
Derivative liability		13
Other | Southern Power | Recurring | Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liability		0
Cash and cash equivalents | Southern Company Gas | Recurring
Assets:
Non-qualified deferred compensation trusts	1	3
Cash and cash equivalents | Southern Company Gas | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Non-qualified deferred compensation trusts	1	3
Cash and cash equivalents | Southern Company Gas | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Non-qualified deferred compensation trusts	0	0
Cash and cash equivalents | Southern Company Gas | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Non-qualified deferred compensation trusts	$ 0	$ 0

FAIR VALUE MEASUREMENTS - Narra

FAIR VALUE MEASUREMENTS - Narrative (Details) - Alabama Power - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]
Alternative investment	$ 190	$ 178
Unfunded commitments	$ 78	$ 87

FAIR VALUE MEASUREMENTS - Finan

FAIR VALUE MEASUREMENTS - Financial Instruments, Carrying Amount Not Equal to Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 63,200	$ 59,400
Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	57,700	55,000
Alabama Power | Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	11,200	11,200
Alabama Power | Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	9,800	10,100
Georgia Power | Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	18,100	16,500
Georgia Power | Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	16,200	15,100
Mississippi Power | Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,700	1,600
Mississippi Power | Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,500	1,400
Southern Power | Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	2,700	2,700
Southern Power | Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	2,600	2,600
Southern Company Gas | Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	8,500	7,800
Southern Company Gas | Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 7,400	$ 6,800

DERIVATIVES - Energy-Related De

DERIVATIVES - Energy-Related Derivative Contracts (Details) - Energy-related, Natural Gas MMBTU in Millions	Dec. 31, 2024 MMBTU
Derivative [Line Items]
Net Purchased mmBtu	431
Alabama Power
Derivative [Line Items]
Net Purchased mmBtu	123
Georgia Power
Derivative [Line Items]
Net Purchased mmBtu	116
Mississippi Power
Derivative [Line Items]
Net Purchased mmBtu	103
Southern Power
Derivative [Line Items]
Net Purchased mmBtu	6
Southern Company Gas
Derivative [Line Items]
Net Purchased mmBtu	83
Long | Not Designated as Hedging Instrument | Southern Company Gas
Derivative [Line Items]
Derivative nonmonetary notional amount net long short position volume	90
Short | Not Designated as Hedging Instrument | Southern Company Gas
Derivative [Line Items]
Derivative nonmonetary notional amount net long short position volume	7

DERIVATIVES - Narrative (Detail

DERIVATIVES - Narrative (Details) MMBTU in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) MMBTU	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints | MMBTU	15
Estimated pre-tax gains (losses) that will be reclassified from OCI to interest expense for the next 12-month period	$ (13,000,000)
Collateral already posted, aggregate fair value	17,000,000	$ 62,000,000
Derivative liability	554,000,000	659,000,000
Interest rate derivatives
Derivative [Line Items]
Derivative liability	72,000,000
Interest rate derivatives | Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	23,000,000	(12,000,000)	$ 46,000,000
Energy-related derivatives | Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	$ (7,000,000)	(81,000,000)	3,000,000
Alabama Power
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints | MMBTU	4
Collateral already posted, aggregate fair value	$ 0
Derivative liability	23,000,000	100,000,000
Alabama Power | Energy-related derivatives | Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	$ 0	0	0
Georgia Power
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints | MMBTU	6
Derivative liability	$ 27,000,000	113,000,000
Georgia Power | Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	$ 24,000,000	(2,000,000)	31,000,000
Mississippi Power
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints | MMBTU	2
Derivative liability	$ 17,000,000	47,000,000
Mississippi Power | Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	$ 7,000,000	0	0
Southern Power
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints | MMBTU	3
Estimated pre-tax gains (losses) that will be reclassified from OCI to interest expense for the next 12-month period	$ (25,000,000)
Collateral already posted, aggregate fair value	0
Derivative liability	51,000,000	27,000,000
Southern Power | Interest rate derivatives
Derivative [Line Items]
Derivative liability	24,000,000
Southern Power | Energy-related derivatives | Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	(1,000,000)	(18,000,000)	(15,000,000)
Registrants | Derivative Counterparties
Derivative [Line Items]
Collateral already posted, aggregate fair value	0
Southern Company Gas
Derivative [Line Items]
Collateral already posted, aggregate fair value	17,000,000	62,000,000
Derivative liability	84,000,000	87,000,000
Southern Company Gas | Interest rate derivatives | Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	(5,000,000)	0	0
Southern Company Gas | Energy-related derivatives | Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	(6,000,000)	$ (63,000,000)	$ 18,000,000
Traditional Electric Operating Companies
Derivative [Line Items]
Estimated pre-tax gains (losses) that will be reclassified from OCI to interest expense for the next 12-month period	$ 0

DERIVATIVES - Interest Rate Der

DERIVATIVES - Interest Rate Derivatives (Details) - Interest rate derivatives $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Derivative [Line Items]
Notional Amount	$ 1,900
Fair Value Gain (Loss) December 31, 2024	(269)
Southern Company | Fair Value Hedges of Existing Debt | Date one
Derivative [Line Items]
Notional Amount	$ 400
Weighted Average Interest Rate Paid	0.80%
Interest Rate Received	1.75%
Fair Value Gain (Loss) December 31, 2024	$ (42)
Southern Company | Fair Value Hedges of Existing Debt | Date 2
Derivative [Line Items]
Notional Amount	$ 1,000
Weighted Average Interest Rate Paid	2.48%
Interest Rate Received	3.70%
Fair Value Gain (Loss) December 31, 2024	$ (143)
Southern Company Gas | Fair Value Hedges of Existing Debt
Derivative [Line Items]
Notional Amount	$ 500
Weighted Average Interest Rate Paid	0.49%
Interest Rate Received	1.75%
Fair Value Gain (Loss) December 31, 2024	$ (84)

DERIVATIVES - Foreign Currency

DERIVATIVES - Foreign Currency Derivatives (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)
Foreign currency derivatives | Cash Flow Hedges of Forecasted Debt
Derivative [Line Items]
Pay Notional	$ 2,040
Receive Notional | €		€ 1,750
Fair Value Gain (Loss) December 31, 2024	(218)
Southern Power
Derivative [Line Items]
Fair Value Gain (Loss) December 31, 2024	(45)		$ (12)
Southern Power | Foreign currency derivatives | Cash Flow Hedges of Forecasted Debt
Derivative [Line Items]
Pay Notional	$ 564
Pay Rate	3.78%
Receive Notional | €		500
Receive Rate	1.85%
Southern Power | Foreign currency derivatives | Date | Cash Flow Hedges of Forecasted Debt
Derivative [Line Items]
Fair Value Gain (Loss) December 31, 2024	$ (51)
Southern Company | Foreign currency derivatives | Cash Flow Hedges of Forecasted Debt
Derivative [Line Items]
Fair Value Gain (Loss) December 31, 2024	(167)
Southern Company | Foreign currency derivatives | Date | Fair Value Hedges of Existing Debt
Derivative [Line Items]
Pay Notional	$ 1,476
Pay Rate	3.39%
Receive Notional | €		€ 1,250
Receive Rate	1.88%

DERIVATIVES - Derivative Financ

DERIVATIVES - Derivative Financial Statement Presentation and Amounts With Balance Sheet Offsetting (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	$ 89	$ 55
Derivative asset, gross amount offset	(44)	(23)
Derivative asset, net amounts recognized in the balance sheets	45	32
Derivative liability, gross amounts recognized	615	744
Derivative liability, gross amounts offset	$ (61)	$ (85)
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	Net amounts recognized in the Balance Sheets(b)	Net amounts recognized in the Balance Sheets(b)
Derivative liability, gross amounts recognized in balance sheets	$ 554	$ 659
Derivative asset, statement of financial position, extensible enumeration, not disclosed, flag	Net amounts recognized in the Balance Sheets(b)	Net amounts recognized in the Balance Sheets(b)
Collateral already posted, aggregate fair value	$ 17	$ 62
Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	6	9
Derivative liability, gross amounts recognized	3	10
Energy-related derivatives | Other deferred charges and assets | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	1	1
Energy-related derivatives | Other deferred credits and liabilities | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	0	2
Energy-related derivatives | Assets from risk management activities | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	5	8
Energy-related derivatives | Other current liabilities | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	3	8
Interest rate derivatives
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized in balance sheets	72
Alabama Power
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amount offset	(19)	(10)
Derivative asset, net amounts recognized in the balance sheets	7	5
Derivative liability, gross amounts offset	(19)	(10)
Derivative liability, gross amounts recognized in balance sheets	23	100
Collateral already posted, aggregate fair value	0
Georgia Power
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	19	13
Derivative asset, gross amount offset	(15)	(11)
Derivative asset, net amounts recognized in the balance sheets	4	2
Derivative liability, gross amounts recognized	42	124
Derivative liability, gross amounts offset	(15)	(11)
Derivative liability, gross amounts recognized in balance sheets	27	113
Georgia Power | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	1
Derivative liability, gross amounts recognized	1	0
Georgia Power | Energy-related derivatives | Other deferred charges and assets | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	1
Georgia Power | Energy-related derivatives | Other deferred credits and liabilities | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	0	0
Georgia Power | Energy-related derivatives | Other current liabilities | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	1	0
Georgia Power | Energy-related derivatives | Other current assets | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	0
Mississippi Power
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amount offset	(17)	(14)
Derivative asset, net amounts recognized in the balance sheets	2	1
Derivative liability, gross amounts offset	(17)	(14)
Derivative liability, gross amounts recognized in balance sheets	17	47
Southern Power
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, net amounts recognized in the balance sheets	4	3
Derivative liability, gross amounts recognized in balance sheets	51	27
Collateral already posted, aggregate fair value	0
Southern Power | Interest rate derivatives
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized in balance sheets	24
Southern Company Gas
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	21	9
Derivative asset, gross amount offset	7	12
Derivative asset, net amounts recognized in the balance sheets	28	21
Derivative liability, gross amounts recognized	94	137
Derivative liability, gross amounts offset	(10)	(50)
Derivative liability, gross amounts recognized in balance sheets	84	87
Collateral already posted, aggregate fair value	17	62
Southern Company Gas | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	6	8
Derivative liability, gross amounts recognized	2	10
Southern Company Gas | Energy-related derivatives | Other deferred charges and assets | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	1	1
Southern Company Gas | Energy-related derivatives | Other deferred credits and liabilities | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	0	2
Southern Company Gas | Energy-related derivatives | Assets from risk management activities | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	5	7
Southern Company Gas | Energy-related derivatives | Other current liabilities | Not Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	2	8
Hedging Instruments for Regulatory Purposes | Energy-related derivatives | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	75	43
Derivative liability, gross amounts recognized	122	315
Hedging Instruments for Regulatory Purposes | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	42	31
Hedging Instruments for Regulatory Purposes | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	40	117
Hedging Instruments for Regulatory Purposes | Energy-related derivatives | Assets from risk management activities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	33	12
Hedging Instruments for Regulatory Purposes | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	82	198
Hedging Instruments for Regulatory Purposes | Alabama Power | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	26	15
Derivative liability, gross amounts recognized	42	110
Hedging Instruments for Regulatory Purposes | Alabama Power | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	15	9
Hedging Instruments for Regulatory Purposes | Alabama Power | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	12	41
Hedging Instruments for Regulatory Purposes | Alabama Power | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	30	69
Hedging Instruments for Regulatory Purposes | Alabama Power | Energy-related derivatives | Other current assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	11	6
Hedging Instruments for Regulatory Purposes | Georgia Power | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	19	12
Derivative liability, gross amounts recognized	41	124
Hedging Instruments for Regulatory Purposes | Georgia Power | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	13	10
Hedging Instruments for Regulatory Purposes | Georgia Power | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	9	42
Hedging Instruments for Regulatory Purposes | Georgia Power | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	32	82
Hedging Instruments for Regulatory Purposes | Georgia Power | Energy-related derivatives | Other current assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	6	2
Hedging Instruments for Regulatory Purposes | Mississippi Power | Energy-related derivatives | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	19	15
Derivative liability, gross amounts recognized	34	61
Hedging Instruments for Regulatory Purposes | Mississippi Power | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	14	12
Hedging Instruments for Regulatory Purposes | Mississippi Power | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	19	34
Hedging Instruments for Regulatory Purposes | Mississippi Power | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	15	27
Hedging Instruments for Regulatory Purposes | Mississippi Power | Energy-related derivatives | Other current assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	5	3
Hedging Instruments for Regulatory Purposes | Southern Company Gas | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	1	0
Hedging Instruments for Regulatory Purposes | Southern Company Gas | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	0	4
Hedging Instruments for Regulatory Purposes | Southern Company Gas | Energy-related derivatives | Assets from risk management activities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	11	1
Hedging Instruments for Regulatory Purposes | Southern Company Gas | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	5	20
Cash Flow and Fair Value Hedging | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	8	3
Derivative liability, gross amounts recognized	490	419
Cash Flow and Fair Value Hedging | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	4	3
Cash Flow and Fair Value Hedging | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	0	4
Cash Flow and Fair Value Hedging | Energy-related derivatives | Assets from risk management activities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	4	0
Cash Flow and Fair Value Hedging | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	3	29
Cash Flow and Fair Value Hedging | Interest rate derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	0
Cash Flow and Fair Value Hedging | Interest rate derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	208	190
Cash Flow and Fair Value Hedging | Interest rate derivatives | Assets from risk management activities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	0
Cash Flow and Fair Value Hedging | Interest rate derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	61	74
Cash Flow and Fair Value Hedging | Foreign currency derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	0
Cash Flow and Fair Value Hedging | Foreign currency derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	182	88
Cash Flow and Fair Value Hedging | Foreign currency derivatives | Assets from risk management activities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	0
Cash Flow and Fair Value Hedging | Foreign currency derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	36	34
Cash Flow and Fair Value Hedging | Southern Power | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	4	3
Derivative liability, gross amounts recognized	51	27
Cash Flow and Fair Value Hedging | Southern Power | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	3	3
Cash Flow and Fair Value Hedging | Southern Power | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	0	0
Cash Flow and Fair Value Hedging | Southern Power | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	0	5
Cash Flow and Fair Value Hedging | Southern Power | Energy-related derivatives | Other current assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	1	0
Cash Flow and Fair Value Hedging | Southern Power | Foreign currency derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	0
Cash Flow and Fair Value Hedging | Southern Power | Foreign currency derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	40	11
Cash Flow and Fair Value Hedging | Southern Power | Foreign currency derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	11	11
Cash Flow and Fair Value Hedging | Southern Power | Foreign currency derivatives | Other current assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	0
Cash Flow and Fair Value Hedging | Southern Company Gas | Energy-related derivatives | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	4	0
Derivative liability, gross amounts recognized	87	107
Cash Flow and Fair Value Hedging | Southern Company Gas | Energy-related derivatives | Assets from risk management activities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	3	0
Cash Flow and Fair Value Hedging | Southern Company Gas | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	3	24
Cash Flow and Fair Value Hedging | Southern Company Gas | Interest rate derivatives | Other deferred charges and assets | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	0
Cash Flow and Fair Value Hedging | Southern Company Gas | Interest rate derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	67	59
Cash Flow and Fair Value Hedging | Southern Company Gas | Interest rate derivatives | Assets from risk management activities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative asset, gross amounts recognized	0	0
Cash Flow and Fair Value Hedging | Southern Company Gas | Interest rate derivatives | Other current liabilities | Designated as Hedging Instrument
Fair value of energy-related derivatives and interest rate derivatives
Derivative liability, gross amounts recognized	$ 17	$ 20

DERIVATIVES - Schedule of Unrea

DERIVATIVES - Schedule of Unrealized Gain (Loss) Recognized in the Balance Sheet (Details) - Energy-related derivatives - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	$ (50)	$ (257)
Other regulatory assets, current
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	(61)	(180)
Other regulatory assets, deferred
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	(5)	(87)
Other regulatory liabilities, current
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	8	9
Other regulatory liabilities, deferred
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	8	1
Alabama Power
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	(16)	(95)
Alabama Power | Other regulatory assets, current
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	(23)	(67)
Alabama Power | Other regulatory assets, deferred
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	0	(32)
Alabama Power | Other regulatory liabilities, current
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	4	4
Alabama Power | Other regulatory liabilities, deferred
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	3	0
Georgia Power
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	(22)	(112)
Georgia Power | Other regulatory assets, current
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	(26)	(80)
Georgia Power | Other regulatory assets, deferred
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	0	(33)
Georgia Power | Other regulatory liabilities, current
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	0	0
Georgia Power | Other regulatory liabilities, deferred
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	4	1
Mississippi Power
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	(15)	(46)
Mississippi Power | Other regulatory assets, current
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	(11)	(25)
Mississippi Power | Other regulatory assets, deferred
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	(5)	(22)
Mississippi Power | Other regulatory liabilities, current
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	0	1
Mississippi Power | Other regulatory liabilities, deferred
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	1	0
Southern Company Gas
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	3	(4)
Southern Company Gas | Other regulatory assets, current
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	(1)	(8)
Southern Company Gas | Other regulatory assets, deferred
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	0	0
Southern Company Gas | Other regulatory liabilities, current
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	4	4
Southern Company Gas | Other regulatory liabilities, deferred
Derivatives, Fair Value [Line Items]
Total energy-related derivative gains (losses)	$ 0	$ 0

DERIVATIVES - Pre-Tax Effects o

DERIVATIVES - Pre-Tax Effects of Derivatives Designated as Hedges on AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	$ (8)	$ (58)	$ (80)
Energy-related derivatives | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	(7)	(81)	3
Interest rate derivatives | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	23	(12)	46
Foreign currency derivatives | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	(40)	14	(105)
Foreign currency derivatives | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	16	21	(24)
Georgia Power | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	24	(2)	31
Mississippi Power | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	7	0	0
Southern Power
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	(41)	(4)	(120)
Southern Power | Energy-related derivatives | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	(1)	(18)	(15)
Southern Power | Foreign currency derivatives | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	(40)	14	(105)
Southern Company Gas
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	(11)	(63)	18
Southern Company Gas | Energy-related derivatives | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	(6)	(63)	18
Southern Company Gas | Interest rate derivatives | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) From Derivatives Recognized in OCI	$ (5)	$ 0	$ 0

DERIVATIVES - Pre-Tax Effects_2

DERIVATIVES - Pre-Tax Effects of Derivatives Designated as Hedges on Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Depreciation and amortization	$ 4,755	$ 4,525	$ 3,663
Interest expense, net of amounts capitalized	(2,743)	(2,446)	(2,022)
Other income (expense), net	530	553	500
Natural gas
Derivative Instruments, Gain (Loss) [Line Items]
Cost of sales	1,196	1,644	3,004
Energy-related derivatives | Cost of Sales | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative	(40)	(44)	37
Energy-related derivatives | Operating Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on hedges	(2)	(2)	0
Energy-related derivatives | Depreciation and Amortization | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative	(6)	(23)	(5)
Interest rate derivatives | Interest Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative	(16)	(35)	(25)
Interest rate derivatives | Interest Expense | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative	(4)	37	(291)
Foreign currency derivatives | Interest Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative	(12)	(11)	(19)
Foreign currency derivatives | Other Income (Expense) | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative	(33)	19	(83)
Foreign currency fair value hedges	2	69	(106)
Amount excluded from effectiveness testing recognized in earnings	(16)	(21)	24
Southern Power
Derivative Instruments, Gain (Loss) [Line Items]
Depreciation and amortization	522	504	516
Interest expense, net of amounts capitalized	(117)	(129)	(138)
Other income (expense), net	13	12	7
Southern Power | Energy-related derivatives | Depreciation and Amortization | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative	(6)	(23)	(5)
Southern Power | Foreign currency derivatives | Interest Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative	(12)	(11)	(19)
Southern Power | Foreign currency derivatives | Other Income (Expense) | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative	(33)	19	(83)
Southern Company Gas
Derivative Instruments, Gain (Loss) [Line Items]
Cost of sales	1,196	1,644	3,004
Depreciation and amortization	650	582	559
Interest expense, net of amounts capitalized	(341)	(310)	(263)
Other income (expense), net	66	57	53
Southern Company Gas | Energy-related derivatives | Operating Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on hedges	(2)	(2)	0
Southern Company Gas | Interest rate derivatives | Interest Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on hedges	(1)	(19)	(4)
Southern Company Gas | Interest rate derivatives | Interest Expense | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on hedges	(5)	6	(86)
Southern Company Gas | Foreign currency derivatives | Other Income (Expense) | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative	$ (40)	$ (44)	$ 37

DERIVATIVES - Cumulative Basis

DERIVATIVES - Cumulative Basis Adjustments for Fair Value Hedges (Details) - Long-term debt - Fair Value Hedging - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Carrying Amount of the Hedged Item	$ (2,936)	$ (3,024)
Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item	242	235
Southern Company Gas
Derivative Instruments, Gain (Loss) [Line Items]
Carrying Amount of the Hedged Item	(422)	(427)
Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item	$ 75	$ 70

DERIVATIVES - Pre-Tax Effects_3

DERIVATIVES - Pre-Tax Effects of Derivatives Not Designated as Hedging (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Energy-related derivatives | Natural gas revenues
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ 0	$ 0	$ (11)
Energy-related derivatives | Cost of natural gas
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	94	59	(65)
Energy-related derivatives | Cost of natural gas | Not Designated as Hedging Instrument | Southern Company Gas
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	94	59	(76)
Weather derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ 12	$ 15	$ (7)

ACQUISITIONS AND DISPOSITIONS -

ACQUISITIONS AND DISPOSITIONS - Alabama Power Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Capital expenditures related to qualifying projects	$ 8,955	$ 9,095	$ 7,923
Alabama Power
Business Acquisition [Line Items]
Capital expenditures related to qualifying projects	$ 1,881	$ 2,022	2,016
Alabama Power | Calhoun Generating Station
Business Acquisition [Line Items]
Purchase price			179
Capital expenditures related to qualifying projects			$ 171

ACQUISITIONS AND DISPOSITIONS_2

ACQUISITIONS AND DISPOSITIONS - Southern Power Narrative (Details) - SOUTHERN POWER CO $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2024 MW	Dec. 31, 2024 USD ($) MW	Dec. 31, 2023 USD ($)
Kay Wind Facility
Asset Acquisition [Line Items]
Approximate Nameplate Capacity (MW)	299
PPA Contract Period	20 years
Nameplate Capacity, Amount Repowered	200
South Cheyenne Solar Facility
Asset Acquisition [Line Items]
Approximate Nameplate Capacity (MW)		150
PPA Contract Period		20 years
Millers Branch Solar Development Phase 1
Asset Acquisition [Line Items]
Approximate Nameplate Capacity (MW)		200
PPA Contract Period		20 years
Millers Branch Solar Development Phase 2
Asset Acquisition [Line Items]
Approximate Nameplate Capacity (MW)		180
PPA Contract Period		15 years
Millers Branch
Asset Acquisition [Line Items]
Cost of construction | $		$ 292
South Cheyenne Solar Facility and Millers Branch Solar Development
Asset Acquisition [Line Items]
Payments to acquire businesses | $			$ 193

ACQUISITIONS AND DISPOSITIONS_3

ACQUISITIONS AND DISPOSITIONS - Schedule of Asset Acquisitions (Details) - South Cheyenne Solar Facility - Southern Power	12 Months Ended
	Dec. 31, 2024 MW
Asset Acquisition [Line Items]
Approximate Nameplate Capacity (MW)	150
PPA Contract Period	20 years

ACQUISITIONS AND DISPOSITIONS_4

ACQUISITIONS AND DISPOSITIONS - Schedule of Construction Projects (Details) - Southern Power - MW	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2022	Dec. 31, 2021
Garland Solar Storage
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)		88	88
PPA Contract Period		20 years
Nameplate capacity placed in service (in MWs)		15	73
Tranquility Solar Storage
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)		72	72
PPA Contract Period		20 years
Nameplate capacity placed in service (in MWs)			32
Tranquillity Solar Storage
Business Acquisition [Line Items]
Nameplate capacity placed in service (in MWs)		40
Millers Branch Solar Development Phase 1
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)	200
PPA Contract Period	20 years
Millers Branch Solar Development Phase 2
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)	180
PPA Contract Period	15 years
Millers Branch Solar Development Phase 3
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)	132
PPA Contract Period	15 years
South Cheyenne Solar Facility
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)	150
PPA Contract Period	20 years

ACQUISITIONS AND DISPOSITIONS_5

ACQUISITIONS AND DISPOSITIONS - GAS Acquisitions and Dispositions Narrative (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - Natural Gas Storage Facilities - Southern Company Gas $ in Millions	3 Months Ended
	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($) storageFacility
Business Acquisition [Line Items]
Number of natural gas storage facilities sold | storageFacility		2
Consideration for sale		$ 186
Gain (loss) on dispositions	$ (131)
Gain (loss) on dispositions, after tax	$ (99)

SEGMENT AND RELATED INFORMATI_3

SEGMENT AND RELATED INFORMATION - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) segment state	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Total operating revenues	$ 26,764	$ 24,828	$ 25,941
Total operating revenues	26,724	25,253	29,279
Southern Power
Segment Reporting Information [Line Items]
Total operating revenues	1,445	1,630	2,805
Total operating revenues	$ 2,014	2,189	3,369
Number of reportable segments | segment	1
Southern Company Gas
Segment Reporting Information [Line Items]
Total operating revenues	$ 4,340	4,598	5,905
Total operating revenues	$ 4,456	4,702	5,962
Number of reportable segments | segment	3
Number of states in which entity operates | state	4
Southern Natural Gas Company, LLC | Southern Company Gas
Segment Reporting Information [Line Items]
Ownership percentage, equity method investment	50%
Dalton Pipeline | Southern Company Gas
Segment Reporting Information [Line Items]
Ownership percentage, equity method investment	50%
Wholesale revenues, affiliates | Southern Power
Segment Reporting Information [Line Items]
Total operating revenues	$ 371	$ 537	$ 875

SEGMENT AND RELATED INFORMATI_4

SEGMENT AND RELATED INFORMATION - Financial Data for Business Segments (Details) $ in Millions	1 Months Ended	3 Months Ended					12 Months Ended
	Nov. 30, 2024 MW	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Total operating revenues							$ 26,724	$ 25,253	$ 29,279
Other segment items							13,995	13,954	19,426
Depreciation and amortization							4,755	4,525	3,663
Earnings from equity method investments							139	144	151
Interest expense							2,743	2,446	2,022
Income taxes (benefit)							969	496	795
Segment net income (loss)							4,401	3,976	3,524
Goodwill				$ 5,161		$ 5,161	5,161	5,161	5,161
Total assets				139,331		134,891	145,180	139,331	134,891
Segment and Related Information (Textual) [Abstract]
Estimated loss on Plant Vogtle Units 3 and 4							(21)	(68)	183
Southern Company Gas
Segment Reporting Information [Line Items]
Total operating revenues							4,456	4,702	5,962
Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues							26,059	24,700	28,835
Other segment items							13,342	13,405	18,793
Depreciation and amortization							4,684	4,447	3,588
Earnings from equity method investments							154	139	148
Interest expense							1,713	1,584	1,330
Income taxes (benefit)							1,261	794	1,028
Segment net income (loss)							5,213	4,609	4,244
Goodwill				5,017		5,017	5,017	5,017	5,017
Total assets				137,728		132,904	143,382	137,728	132,904
Operating Segments | Electric Utilities
Segment Reporting Information [Line Items]
Total operating revenues							21,603	19,998	22,873
Other segment items							10,729	10,281	14,257
Depreciation and amortization							4,034	3,865	3,029
Earnings from equity method investments							8	(1)	0
Interest expense							1,372	1,274	1,067
Income taxes (benefit)							1,003	583	848
Segment net income (loss)							4,473	3,994	3,672
Goodwill				2		2	2	2	2
Total assets				112,645		108,283	117,205	112,645	108,283
Operating Segments | Traditional Electric Operating Companies
Segment Reporting Information [Line Items]
Total operating revenues							19,977	18,358	20,408
Other segment items							10,057	9,643	12,820
Depreciation and amortization							3,512	3,361	2,513
Earnings from equity method investments							8	(1)	0
Interest expense							1,255	1,145	929
Income taxes (benefit)							1,016	571	828
Segment net income (loss)							4,145	3,637	3,318
Goodwill				0		0	0	0	0
Total assets				100,429		95,861	105,577	100,429	95,861
Operating Segments | Southern Power
Segment Reporting Information [Line Items]
Total operating revenues							2,014	2,189	3,369
Other segment items							1,060	1,187	2,341
Depreciation and amortization							522	504	516
Earnings from equity method investments							0	0	0
Interest expense							117	129	138
Income taxes (benefit)							(13)	12	20
Segment net income (loss)							328	357	354
Goodwill				2		2	2	2	2
Total assets				12,761		13,081	12,653	12,761	13,081
Operating Segments | Southern Company Gas
Segment Reporting Information [Line Items]
Total operating revenues							4,456	4,702	5,962
Other segment items							2,613	3,124	4,536
Depreciation and amortization							650	582	559
Earnings from equity method investments							146	140	148
Interest expense							341	310	263
Income taxes (benefit)							258	211	180
Segment net income (loss)							740	615	572
Goodwill				5,015		5,015	5,015	5,015	5,015
Total assets				25,083		24,621	26,177	25,083	24,621
Eliminations
Segment Reporting Information [Line Items]
Total operating revenues							(178)	(165)	(149)
Other segment items							(149)	(150)	(138)
Depreciation and amortization							0	0	0
Earnings from equity method investments							2	0	0
Interest expense							0	(17)	(2)
Income taxes (benefit)							0	0	0
Segment net income (loss)							(27)	2	(9)
Goodwill				0		0	0	0	0
Total assets				(843)		(678)	(573)	(843)	(678)
Eliminations | Electric Utilities
Segment Reporting Information [Line Items]
Total operating revenues							(388)	(549)	(904)
Other segment items							(388)	(549)	(904)
Depreciation and amortization							0	0	0
Earnings from equity method investments							0	0	0
Interest expense							0	0	0
Income taxes (benefit)							0	0	0
Segment net income (loss)							0	0	0
Goodwill				0		0	0	0	0
Total assets				(545)		(659)	(1,025)	(545)	(659)
All Other
Segment Reporting Information [Line Items]
Total operating revenues							843	718	593
Other segment items							802	699	771
Depreciation and amortization							71	78	75
Earnings from equity method investments							(17)	5	3
Interest expense							1,030	879	694
Income taxes (benefit)							(292)	(298)	(233)
Segment net income (loss)							(785)	(635)	(711)
Goodwill				144		144	144	144	144
Total assets				2,446		2,665	2,371	2,446	2,665
Georgia Power
Segment Reporting Information [Line Items]
Total operating revenues							11,331	10,118	11,584
Depreciation and amortization							1,774	1,681	1,430
Interest expense							725	626	485
Income taxes (benefit)							603	448	370
Total assets				56,817			61,255	56,817
Segment and Related Information (Textual) [Abstract]
Estimated loss on Plant Vogtle Units 3 and 4			$ (21)				(21)	(68)	183
Estimated loss on Plant Vogtle Units 3 and 4, net of tax			$ (16)
Georgia Power | Traditional Electric Operating Companies | Plant Vogtle Units 3 and 4
Segment and Related Information (Textual) [Abstract]
Estimated loss on Plant Vogtle Units 3 and 4							(21)	(68)	183
Estimated loss on Plant Vogtle Units 3 and 4, net of tax							(16)	(50)	137
Southern Power
Segment Reporting Information [Line Items]
Total operating revenues							2,014	2,189	3,369
Depreciation and amortization							522	504	516
Interest expense							117	129	138
Income taxes (benefit)							(13)	12	20
Segment net income (loss)							328	357	354
Total assets				12,761			12,653	12,761
Segment and Related Information (Textual) [Abstract]
Litigation settlement							18
Amount awarded from other party							9
Gain (loss) on dispositions							0	20	2
Southern Power | Kay Wind Facility
Segment and Related Information (Textual) [Abstract]
Pre-tax accelerated depreciation							9
Accelerated depreciation, net of tax							7
Approximate Nameplate Capacity (MW) | MW	299
Southern Company Gas
Segment Reporting Information [Line Items]
Total operating revenues							4,456	4,702	5,962
Other segment items							2,613	3,124	4,536
Depreciation and amortization							650	582	559
Earnings from equity method investments							146	140	148
Interest expense							341	310	263
Income taxes (benefit)							258	211	180
Segment net income (loss)							740	615	572
Goodwill				5,015			5,015	5,015
Total assets				25,083		24,621	26,177	25,083	24,621
Segment and Related Information (Textual) [Abstract]
Impairment charges							0	0	131
Estimated loss on regulatory disallowance							0	(96)	0
Southern Company Gas | Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues							4,447	4,685	5,937
Other segment items							2,598	3,109	4,401
Depreciation and amortization							649	581	537
Earnings from equity method investments							146	140	148
Interest expense							349	310	259
Income taxes (benefit)							244	195	217
Segment net income (loss)							753	630	671
Total assets				26,055		25,233	27,336	26,055	25,233
Southern Company Gas | Eliminations
Segment Reporting Information [Line Items]
Total operating revenues							(14)	(19)	(30)
Other segment items							(14)	(19)	(30)
Depreciation and amortization							0	0	0
Earnings from equity method investments							0	0	0
Interest expense							0	0	0
Income taxes (benefit)							0	0	0
Segment net income (loss)							0	0	0
Total assets				(10,647)		(9,555)	(11,206)	(10,647)	(9,555)
Southern Company Gas | All Other
Segment Reporting Information [Line Items]
Total operating revenues							23	36	55
Other segment items							29	34	165
Depreciation and amortization							1	1	22
Earnings from equity method investments							0	0	0
Interest expense							(8)	0	4
Income taxes (benefit)							14	16	(37)
Segment net income (loss)							(13)	(15)	(99)
Total assets				9,675		8,943	10,047	9,675	8,943
Nicor Gas
Segment and Related Information (Textual) [Abstract]
Estimated loss on regulatory disallowance				(58)	$ (38)		96
Estimated loss on regulatory disallowance, after tax				(44)	$ (28)		72
Alabama Power
Segment Reporting Information [Line Items]
Total operating revenues							7,554	7,050	7,817
Depreciation and amortization							1,459	1,401	875
Interest expense							448	425	382
Income taxes (benefit)							360	81	423
Segment net income (loss)							1,403	1,370	$ 1,340
Total assets				$ 35,780			36,538	$ 35,780
Segment and Related Information (Textual) [Abstract]
Impairment charges		$ 36
Impairment charges, after tax		$ 27
Spare Parts | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Southern Power
Segment and Related Information (Textual) [Abstract]
Gain on sale							16
Gain on sale, after tax							$ 12
Natural Gas Storage Facilities | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Southern Company Gas
Segment and Related Information (Textual) [Abstract]
Gain (loss) on dispositions						(131)
Gain (loss) on dispositions, after tax						$ (99)

SEGMENT AND RELATED INFORMATI_5

SEGMENT AND RELATED INFORMATION - Electric Utilities' Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Total operating revenues	$ 26,724	$ 25,253	$ 29,279
Wholesale electric revenues
Revenue from External Customer [Line Items]
Total operating revenues	2,431	2,467	3,641
Electric Utilities
Revenue from External Customer [Line Items]
Total operating revenues	21,603	19,998	22,873
Electric Utilities | Retail electric revenues
Revenue from External Customer [Line Items]
Total operating revenues	17,790	16,343	18,197
Electric Utilities | Wholesale electric revenues
Revenue from External Customer [Line Items]
Total operating revenues	2,431	2,467	3,641
Electric Utilities | Other
Revenue from External Customer [Line Items]
Total operating revenues	$ 1,382	$ 1,188	$ 1,035

SEGMENT AND RELATED INFORMATI_6

SEGMENT AND RELATED INFORMATION - Traditional Electric Companies (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total operating revenues			$ 26,724	$ 25,253	$ 29,279
Total utility operations and maintenance			6,539	6,093	6,824
Other segment items			13,995	13,954	19,426
Depreciation and amortization			4,755	4,525	3,663
Interest expense			2,743	2,446	2,022
Income taxes (benefit)			969	496	795
Net Income			4,260	3,849	3,428
Estimated Loss On Plant Vogtle Units 3 And 4			(21)	(68)	183
Alabama Power
Segment Reporting Information [Line Items]
Total operating revenues			7,554	7,050	7,817
Total utility operations and maintenance			1,895	1,769	1,935
Depreciation and amortization			1,459	1,401	875
Interest expense			448	425	382
Income taxes (benefit)			360	81	423
Net Income			1,403	1,370	1,351
Impairment charges	$ 36
Impairment charges, after tax	$ 27
Alabama Power | Reportable Segment
Segment Reporting Information [Line Items]
Total operating revenues			7,554	7,050	7,817
Rate RSE expenses			1,480	1,421	1,645
Rate CNP Compliance expenses			279	254	237
Total utility operations and maintenance			1,759	1,675	1,882
Other segment items			2,125	2,098	2,915
Depreciation and amortization			1,459	1,401	875
Interest expense			448	425	382
Income taxes (benefit)			360	81	423
Net Income			1,403	1,370	1,340
Capital expenditures			2,114	2,159	2,206
Georgia Power
Segment Reporting Information [Line Items]
Total operating revenues			11,331	10,118	11,584
Total utility operations and maintenance			2,372	2,083	2,349
Depreciation and amortization			1,774	1,681	1,430
Interest expense			725	626	485
Income taxes (benefit)			603	448	370
Net Income			2,543	2,080	1,813
Estimated Loss On Plant Vogtle Units 3 And 4		$ (21)	(21)	(68)	183
Estimated loss on Plant Vogtle Units 3 and 4, net of tax		(16)
Georgia Power | Reportable Segment
Segment Reporting Information [Line Items]
Total operating revenues			11,331	10,118	11,584
Total utility operations and maintenance			2,210	1,901	2,237
Other segment items			3,476	3,382	5,249
Depreciation and amortization			1,774	1,681	1,430
Interest expense			725	626	485
Income taxes (benefit)			603	448	370
Net Income			2,543	2,080	1,813
Capital expenditures			5,355	5,394	4,219
Georgia Power | Traditional Electric Operating Companies | Plant Vogtle Units 3 and 4
Segment Reporting Information [Line Items]
Estimated Loss On Plant Vogtle Units 3 And 4			(21)	(68)	183
Estimated loss on Plant Vogtle Units 3 and 4, net of tax			(16)	(50)	137
Southern Company And Georgia Power | Disposal Group, Held-for-sale, Not Discontinued Operations
Segment Reporting Information [Line Items]
Gain on sale		114
Gain on sale, after tax		$ 84
Mississippi Power
Segment Reporting Information [Line Items]
Total operating revenues			1,463	1,474	1,694
Total utility operations and maintenance			370	362	376
Depreciation and amortization			193	190	181
Interest expense			77	71	56
Income taxes (benefit)			47	36	37
Net Income			199	188	164
Mississippi Power | Reportable Segment
Segment Reporting Information [Line Items]
Other segment items			$ 900	$ 1,000	$ 1,300

SEGMENT AND RELATED INFORMATI_7

SEGMENT AND RELATED INFORMATION - Southern Power (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Other segment items	$ 13,995	$ 13,954	$ 19,426
Total operating revenues	$ 26,724	25,253	29,279
SOUTHERN POWER CO
Segment Reporting Information [Line Items]
Number of reportable segments | segment	1
Total operating revenues	$ 2,014	2,189	3,369
SOUTHERN POWER CO | Wholesale revenues, affiliates
Segment Reporting Information [Line Items]
Total operating revenues	$ 371	537	875
Alabama Power
Segment Reporting Information [Line Items]
Number of reportable segments | segment	1
Total operating revenues	$ 7,554	7,050	7,817
Alabama Power | Wholesale revenues, affiliates
Segment Reporting Information [Line Items]
Total operating revenues	$ 139	60	202
Georgia Power
Segment Reporting Information [Line Items]
Number of reportable segments | segment	1
Total operating revenues	$ 11,331	10,118	11,584
Mississippi Power
Segment Reporting Information [Line Items]
Number of reportable segments | segment	1
Total operating revenues	$ 1,463	1,474	1,694
Mississippi Power | Wholesale revenues, affiliates
Segment Reporting Information [Line Items]
Total operating revenues	218	200	460
Reportable Segment | SOUTHERN POWER CO
Segment Reporting Information [Line Items]
Other segment items	1,100	1,200	2,300
Reportable Segment | Alabama Power
Segment Reporting Information [Line Items]
Other segment items	2,125	2,098	2,915
Total operating revenues	7,554	7,050	7,817
Reportable Segment | Georgia Power
Segment Reporting Information [Line Items]
Other segment items	3,476	3,382	5,249
Total operating revenues	11,331	10,118	11,584
Reportable Segment | Mississippi Power
Segment Reporting Information [Line Items]
Other segment items	$ 900	$ 1,000	$ 1,300

SEGMENT AND RELATED INFORMATI_8

SEGMENT AND RELATED INFORMATION - Gas Revenues (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating revenues				$ 26,724	$ 25,253	$ 29,279
Other segment items				13,995	13,954	19,426
Depreciation and amortization				4,755	4,525	3,663
Earnings from equity method investments				139	144	151
Interest expense				2,743	2,446	2,022
Income taxes (benefit)				969	496	795
Segment net income (loss)				4,401	3,976	3,524
Total assets	$ 139,331		$ 134,891	145,180	139,331	134,891
Southern Company Gas
Segment Reporting Information [Line Items]
Operating revenues				4,456	4,702	5,962
Other segment items				2,613	3,124	4,536
Depreciation and amortization				650	582	559
Earnings from equity method investments				146	140	148
Interest expense				341	310	263
Income taxes (benefit)				258	211	180
Segment net income (loss)				740	615	572
Total assets	25,083		24,621	26,177	25,083	24,621
Estimated loss on regulatory disallowance				0	(96)	0
Southern Company Gas | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Natural Gas Storage Facilities
Segment Reporting Information [Line Items]
Gain on dispositions, net			(131)
Gain (loss) on dispositions, after tax			(99)
Nicor Gas
Segment Reporting Information [Line Items]
Estimated loss on regulatory disallowance	(58)	$ (38)		96
Estimated loss on regulatory disallowance, after tax	(44)	$ (28)		72
Operating Segments
Segment Reporting Information [Line Items]
Operating revenues				26,059	24,700	28,835
Other segment items				13,342	13,405	18,793
Depreciation and amortization				4,684	4,447	3,588
Earnings from equity method investments				154	139	148
Interest expense				1,713	1,584	1,330
Income taxes (benefit)				1,261	794	1,028
Segment net income (loss)				5,213	4,609	4,244
Total assets	137,728		132,904	143,382	137,728	132,904
Operating Segments | Southern Company Gas
Segment Reporting Information [Line Items]
Operating revenues				4,447	4,685	5,937
Other segment items				2,598	3,109	4,401
Depreciation and amortization				649	581	537
Earnings from equity method investments				146	140	148
Interest expense				349	310	259
Income taxes (benefit)				244	195	217
Segment net income (loss)				753	630	671
Total assets	26,055		25,233	27,336	26,055	25,233
All Other
Segment Reporting Information [Line Items]
Operating revenues				843	718	593
Other segment items				802	699	771
Depreciation and amortization				71	78	75
Earnings from equity method investments				(17)	5	3
Interest expense				1,030	879	694
Income taxes (benefit)				(292)	(298)	(233)
Segment net income (loss)				(785)	(635)	(711)
Total assets	2,446		2,665	2,371	2,446	2,665
All Other | Southern Company Gas
Segment Reporting Information [Line Items]
Operating revenues				23	36	55
Other segment items				29	34	165
Depreciation and amortization				1	1	22
Earnings from equity method investments				0	0	0
Interest expense				(8)	0	4
Income taxes (benefit)				14	16	(37)
Segment net income (loss)				(13)	(15)	(99)
Total assets	9,675		8,943	10,047	9,675	8,943
Eliminations
Segment Reporting Information [Line Items]
Operating revenues				(178)	(165)	(149)
Other segment items				(149)	(150)	(138)
Depreciation and amortization				0	0	0
Earnings from equity method investments				2	0	0
Interest expense				0	(17)	(2)
Income taxes (benefit)				0	0	0
Segment net income (loss)				(27)	2	(9)
Total assets	(843)		(678)	(573)	(843)	(678)
Eliminations | Southern Company Gas
Segment Reporting Information [Line Items]
Operating revenues				(14)	(19)	(30)
Other segment items				(14)	(19)	(30)
Depreciation and amortization				0	0	0
Earnings from equity method investments				0	0	0
Interest expense				0	0	0
Income taxes (benefit)				0	0	0
Segment net income (loss)				0	0	0
Total assets	(10,647)		(9,555)	(11,206)	(10,647)	(9,555)
Gas distribution operations | Operating Segments | Southern Company Gas
Segment Reporting Information [Line Items]
Operating revenues				3,899	4,105	5,267
Other segment items				2,236	2,702	3,907
Depreciation and amortization				630	561	516
Earnings from equity method investments				0	0	0
Interest expense				311	275	229
Income taxes (benefit)				172	126	145
Segment net income (loss)				550	441	470
Total assets	22,906		22,040	24,067	22,906	22,040
Gas Pipeline Investments | Operating Segments | Southern Company Gas
Segment Reporting Information [Line Items]
Operating revenues				32	32	32
Other segment items				6	5	6
Depreciation and amortization				5	5	5
Earnings from equity method investments				146	140	148
Interest expense				35	32	27
Income taxes (benefit)				31	32	35
Segment net income (loss)				101	98	107
Total assets	1,534		1,577	1,573	1,534	1,577
Gas marketing services | Operating Segments | Southern Company Gas
Segment Reporting Information [Line Items]
Operating revenues				516	548	638
Other segment items				356	402	488
Depreciation and amortization				14	15	16
Earnings from equity method investments				0	0	0
Interest expense				3	3	3
Income taxes (benefit)				41	37	37
Segment net income (loss)				102	91	94
Total assets	1,615		1,616	1,696	1,615	1,616
Southern Company Gas
Segment Reporting Information [Line Items]
Operating revenues				4,456	4,702	5,962
Southern Company Gas | Gas distribution operations
Segment Reporting Information [Line Items]
Operating revenues				3,899	4,090	5,240
Southern Company Gas | Gas marketing services
Segment Reporting Information [Line Items]
Operating revenues				516	548	638
Southern Company Gas | Other Gas Revenue
Segment Reporting Information [Line Items]
Operating revenues				41	64	84
Southern Company Gas | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues				4,456	4,702	5,962
Other segment items				2,613	3,124	4,536
Depreciation and amortization				650	582	559
Earnings from equity method investments				146	140	148
Interest expense				341	310	263
Income taxes (benefit)				258	211	180
Segment net income (loss)				740	615	572
Total assets	$ 25,083		$ 24,621	$ 26,177	$ 25,083	$ 24,621

VALUATION AND QUALIFYING ACCO_2

VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Provision for uncollectible accounts:
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 68	$ 71	$ 78
Charged to Income	119	87	71
Charged to Other Accounts	(1)	3	(1)
Deductions	112	93	77
Balance at End of Period	74	68	71
Provision for uncollectible accounts: | Alabama Power
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	16	14	14
Charged to Income	26	16	10
Charged to Other Accounts	0	0	0
Deductions	20	14	10
Balance at End of Period	22	16	14
Provision for uncollectible accounts: | Georgia Power
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	4	3	2
Charged to Income	51	26	21
Charged to Other Accounts	0	0	0
Deductions	40	25	20
Balance at End of Period	15	4	3
Provision for uncollectible accounts: | Mississippi Power
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1	1	1
Charged to Income	2	2	1
Charged to Other Accounts	0	0	1
Deductions	2	2	2
Balance at End of Period	1	1	1
Provision for uncollectible accounts: | Southern Power
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1	1	5
Charged to Income	(1)	0	(2)
Charged to Other Accounts	0	0	0
Deductions	0	0	2
Balance at End of Period	0	1	1
Provision for uncollectible accounts: | Southern Company Gas
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	44	50	39
Charged to Income	39	43	55
Charged to Other Accounts	(1)	3	0
Deductions	49	52	44
Balance at End of Period	33	44	50
Tax valuation allowance (net state)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	168	207	169
Charged to Income	97	(14)	68
Charged to Other Accounts	3	(25)	(30)
Deductions	0	0	0
Balance at End of Period	268	168	207
Tax valuation allowance (net state) | Georgia Power
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	60	98	58
Charged to Income	97	(15)	70
Charged to Other Accounts	(33)	(23)	(30)
Deductions	0	0	0
Balance at End of Period	124	60	98
Tax valuation allowance (net state) | Mississippi Power
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	32	32	32
Charged to Income	0	0	0
Charged to Other Accounts	0	0	0
Deductions	0	0	0
Balance at End of Period	32	32	32
Tax valuation allowance (net state) | Southern Power
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	21	21	21
Charged to Income	0	0	0
Charged to Other Accounts	0	0	0
Deductions	0	0	0
Balance at End of Period	21	21	21
Tax valuation allowance (net state) | Southern Company Gas
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	5	7	7
Charged to Income	0	0	0
Charged to Other Accounts	(1)	(2)	0
Deductions	0	0	0
Balance at End of Period	$ 4	$ 5	$ 7