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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedule of costs for affiliate transactions | Costs for these services from SCS in 2023, 2022, and 2021 were as follows:
| Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
2023 | $ | 611 |  | $ | 857 |  | $ | 113 |  | $ | 86 |  | $ | 261 |
2022 | 549 |  | 762 |  | 115 |  | 86 |  | 262 |
2021 | 504 |  | 663 |  | 120 |  | 89 |  | 239 |
Mississippi Power's and Southern Power's power purchases from affiliates through the Southern Company power pool are included in purchased power on their respective statements of income and were as follows:
| Mississippi Power | Southern Power
| (in millions)
2023 | $ | 4 |  | $ | 13 |
2022 | 4 |  | 29 |
2021 | 9 |  | 15 |
Transportation costs under these agreements in 2023, 2022, and 2021 were as follows:
| Alabama Power | Georgia Power | Southern Power | Southern Company Gas
| (in millions)
2023 | $ | 12 |  | $ | 101 |  | $ | 34 |  | $ | 28 |
2022 | 18 |  | 99 |  | 37 |  | 27 |
2021 | 14 |  | 108 |  | 31 |  | 29 |
The approximate rates for 2023, 2022, and 2021 are as follows:
| 2023 | 2022 | 2021
Alabama Power | 4.1 | % | 2.7 | % | 2.7 | %
Georgia Power | 3.8 | % | 3.3 | % | 3.3 | %
Mississippi Power | 3.4 | % | 3.4 | % | 3.6 | %
Southern Company Gas | 2.7 | % | 2.7 | % | 2.8 | %
Schedule of total AFUDC and interest capitalized | Total AFUDC and interest capitalized for the applicable Registrants in 2023, 2022, and 2021 was as follows:
| Southern Company | Alabama Power | Georgia Power(*) |  | Southern Power | Southern Company Gas
| (in millions)
2023 | $ | 400 |  | $ | 109 |  | $ | 251 |  |  | $ | 3 |  | $ | 37 |
2022 | 327 |  | 90 |  | 213 |  |  | — |  | 24 |
2021 | 282 |  | 68 |  | 190 |  |  | 6 |  | 18 |
(*)See Note 2 under "Georgia Power – Nuclear Construction" for information on the inclusion of a portion of construction costs related to Plant Vogtle Unit 4 in Georgia Power's rate base.
Schedule of average AFUDC composite rates | The average AFUDC composite rates for 2023, 2022, and 2021 for the traditional electric operating companies and the natural gas distribution utilities were as follows:
| 2023 | 2022 | 2021
Alabama Power | 8.1 | % | 7.9 | % | 7.9 | %
Georgia Power(a) | 7.6 | % | 7.3 | % | 7.2 | %
Mississippi Power(b) | — | % | 5.3 | % | 2.5 | %
Southern Company Gas: |  |  |
Atlanta Gas Light | 7.4 | % | 7.6 | % | 7.7 | %
Chattanooga Gas | 7.1 | % | 7.1 | % | 7.1 | %
Nicor Gas | 4.6 | % | 2.0 | % | 0.1 | %
(a)Excludes AFUDC related to the construction of Plant Vogtle Units 3 and 4. See Note 2 under "Georgia Power – Nuclear Construction" for additional information. (b)Mississippi Power's AFUDC was immaterial in 2023.
Schedule of goodwill balances | At December 31, 2023 and 2022, goodwill was as follows:
| At December 31, 2023 | At December 31, 2022
| (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, 2023 and 2022, other intangible assets were as follows:
| At December 31, 2023 |  | At December 31, 2022
| Gross Carrying Amount | Accumulated Amortization | Other Intangible Assets, Net |  | Gross Carrying Amount | Accumulated Amortization | Other Intangible Assets, Net
| (in millions) |  | (in millions)
Southern Company |  |  |  |  |  |  |
Subject to amortization: |  |  |  |  |  |  |
Customer relationships | $ | 212 |  | $ | (172) |  | $ | 40 |  |  | $ | 212 |  | $ | (162) |  | $ | 50 |
Trade names | 64 |  | (53) |  | 11 |  |  | 64 |  | (44) |  | 20 |
PPA fair value adjustments | 390 |  | (148) |  | 242 |  |  | 390 |  | (129) |  | 261 |
Other | 3 |  | (3) |  | — |  |  | 5 |  | (5) |  | — |
Total subject to amortization | $ | 669 |  | $ | (376) |  | $ | 293 |  |  | $ | 671 |  | $ | (340) |  | $ | 331 |
Not subject to amortization: |  |  |  |  |  |  |
FCC licenses | 75 |  | — |  | 75 |  |  | 75 |  | — |  | 75 |
Total other intangible assets | $ | 744 |  | $ | (376) |  | $ | 368 |  |  | $ | 746 |  | $ | (340) |  | $ | 406 |
Southern Power(*) |  |  |  |  |  |  |
PPA fair value adjustments | $ | 390 |  | $ | (148) |  | $ | 242 |  |  | $ | 390 |  | $ | (129) |  | $ | 261 |
Southern Company Gas(*) |  |  |  |  |  |  |
Gas marketing services |  |  |  |  |  |  |
Customer relationships | $ | 156 |  | $ | (145) |  | $ | 11 |  |  | $ | 156 |  | $ | (139) |  | $ | 17 |
Trade names | 26 |  | (21) |  | 5 |  |  | 26 |  | (17) |  | 9 |
Total other intangible assets | $ | 182 |  | $ | (166) |  | $ | 16 |  |  | $ | 182 |  | $ | (156) |  | $ | 26 |
(*)All subject to amortization.
Schedule of intangible assets not subject to amortization | At December 31, 2023 and 2022, other intangible assets were as follows:
| At December 31, 2023 |  | At December 31, 2022
| Gross Carrying Amount | Accumulated Amortization | Other Intangible Assets, Net |  | Gross Carrying Amount | Accumulated Amortization | Other Intangible Assets, Net
| (in millions) |  | (in millions)
Southern Company |  |  |  |  |  |  |
Subject to amortization: |  |  |  |  |  |  |
Customer relationships | $ | 212 |  | $ | (172) |  | $ | 40 |  |  | $ | 212 |  | $ | (162) |  | $ | 50 |
Trade names | 64 |  | (53) |  | 11 |  |  | 64 |  | (44) |  | 20 |
PPA fair value adjustments | 390 |  | (148) |  | 242 |  |  | 390 |  | (129) |  | 261 |
Other | 3 |  | (3) |  | — |  |  | 5 |  | (5) |  | — |
Total subject to amortization | $ | 669 |  | $ | (376) |  | $ | 293 |  |  | $ | 671 |  | $ | (340) |  | $ | 331 |
Not subject to amortization: |  |  |  |  |  |  |
FCC licenses | 75 |  | — |  | 75 |  |  | 75 |  | — |  | 75 |
Total other intangible assets | $ | 744 |  | $ | (376) |  | $ | 368 |  |  | $ | 746 |  | $ | (340) |  | $ | 406 |
Southern Power(*) |  |  |  |  |  |  |
PPA fair value adjustments | $ | 390 |  | $ | (148) |  | $ | 242 |  |  | $ | 390 |  | $ | (129) |  | $ | 261 |
Southern Company Gas(*) |  |  |  |  |  |  |
Gas marketing services |  |  |  |  |  |  |
Customer relationships | $ | 156 |  | $ | (145) |  | $ | 11 |  |  | $ | 156 |  | $ | (139) |  | $ | 17 |
Trade names | 26 |  | (21) |  | 5 |  |  | 26 |  | (17) |  | 9 |
Total other intangible assets | $ | 182 |  | $ | (166) |  | $ | 16 |  |  | $ | 182 |  | $ | (156) |  | $ | 26 |
(*)All subject to amortization.
Schedule of amortization associated with other intangible assets | Amortization associated with other intangible assets in 2023, 2022, and 2021 was as follows:
| 2023 | 2022 | 2021
| (in millions)
Southern Company(a) | $ | 38 |  | $ | 39 |  | $ | 44 |
Southern Power(b) | 20 |  | 20 |  | 20 |
Southern Company Gas: |  |  |
Gas marketing services | 10 |  | 11 |  | 15 |
(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, 2023, the estimated amortization associated with other intangible assets for the next five years is as follows:
| 2024 | 2025 | 2026 | 2027 | 2028
| (in millions)
Southern Company | $ | 35 |  | $ | 32 |  | $ | 27 |  | $ | 24 |  | $ | 24 |
Southern Power | 20 |  | 20 |  | 20 |  | 20 |  | 20 |
Southern Company Gas | 7 |  | 6 |  | 3 |  | — |  | — |
Schedule of cash, cash equivalents, and restricted cash | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets that total to the amount shown in the statements of cash flows for the applicable Registrants:
| Southern Company | Alabama Power | Georgia Power | Southern Power | Southern Company Gas
| (in millions)
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 |
At December 31, 2022 |  |  |  |  |
Cash and cash equivalents | $ | 1,917 |  | $ | 687 |  | $ | 364 |  | $ | 131 |  | $ | 81 |
Restricted cash(a): |  |  |  |  |
Other current assets | 62 |  | — |  | 60 |  | — |  | 2 |
Other deferred charges and assets | 58 |  | — |  | 56 |  | 3 |  | — |
Total cash, cash equivalents, and restricted cash(b) | $ | 2,037 |  | $ | 687 |  | $ | 480 |  | $ | 133 |  | $ | 83 |
(a)For Alabama Power, reflects proceeds from the issuance of solid waste disposal facility revenue bonds in 2023. For Georgia Power, reflects proceeds from the issuance of solid waste disposal facility revenue bonds in 2022. See Note 8 under "Long-term Debt" for additional information. For Southern Power, reflects $17 million at December 31, 2023 resulting from an arbitration award held to fund future replacement costs and $3 million at both December 31, 2023 and 2022 held to fund estimated construction completion costs at the Deuel Harvest wind facility. See Note 3 under "General Litigation Matters – Southern Power" and Note 15 under "Southern Power" for additional information. For Southern Company Gas, reflects collateral for workers' compensation, life insurance, and long-term disability insurance. (b)Total may not add due to rounding.
Reconciliation of restricted cash and cash equivalents | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets that total to the amount shown in the statements of cash flows for the applicable Registrants:
| Southern Company | Alabama Power | Georgia Power | Southern Power | Southern Company Gas
| (in millions)
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 |
At December 31, 2022 |  |  |  |  |
Cash and cash equivalents | $ | 1,917 |  | $ | 687 |  | $ | 364 |  | $ | 131 |  | $ | 81 |
Restricted cash(a): |  |  |  |  |
Other current assets | 62 |  | — |  | 60 |  | — |  | 2 |
Other deferred charges and assets | 58 |  | — |  | 56 |  | 3 |  | — |
Total cash, cash equivalents, and restricted cash(b) | $ | 2,037 |  | $ | 687 |  | $ | 480 |  | $ | 133 |  | $ | 83 |
(a)For Alabama Power, reflects proceeds from the issuance of solid waste disposal facility revenue bonds in 2023. For Georgia Power, reflects proceeds from the issuance of solid waste disposal facility revenue bonds in 2022. See Note 8 under "Long-term Debt" for additional information. For Southern Power, reflects $17 million at December 31, 2023 resulting from an arbitration award held to fund future replacement costs and $3 million at both December 31, 2023 and 2022 held to fund estimated construction completion costs at the Deuel Harvest wind facility. See Note 3 under "General Litigation Matters – Southern Power" and Note 15 under "Southern Power" for additional information. For Southern Company Gas, reflects collateral for workers' compensation, life insurance, and long-term disability insurance. (b)Total may not add due to rounding.
Schedule of storm damage reserves | Storm damage reserve activity for the traditional electric operating companies during 2023 was as follows:
| Southern Company | Alabama Power | Georgia Power | Mississippi Power
| (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 |
The traditional electric operating companies accrued the following amounts related to storm damage recovery in 2022 and 2021:
| Southern Company(a)(b) | Alabama Power(a) | Georgia Power | Mississippi Power(b)
| (in millions)
2022 | $ | 239 |  | $ | 19 |  | $ | 213 |  | $ | 7 |
2021 | 286 |  | 75 |  | 213 |  | (2) |
(a)Alabama Power's 2021 amount includes the $65 million additional accrual discussed above. (b)Mississippi Power's net accrual includes carrying costs, as well as amortization of related excess deferred income tax benefits. During 2023 and 2022, Alabama Power and Mississippi Power accrued the following amounts to their reliability reserves:
| Southern Company | Alabama Power | Mississippi Power
| (in millions)
2023 | $ | 63 |  | $ | 52 |  | $ | 11 |
2022 | 191 |  | 166 |  | 25 |
Schedule of AOCI (loss) balances, net of tax effects | AOCI (loss) balances, net of tax effects, for Southern Company, Southern Power, and Southern Company Gas were as follows:
| Qualifying Hedges |  | Pension and Other Postretirement Benefit Plans |  | Accumulated Other Comprehensive Income (Loss)(*)
| (in millions)
Southern Company |  |  |  |  |
Balance at December 31, 2022 | $ | (149) |  |  | $ | (18) |  |  | $ | (167) |
Current period change | 28 |  |  | (38) |  |  | (10) |
Balance at December 31, 2023 | $ | (121) |  |  | $ | (56) |  |  | $ | (177) |
Southern Power |  |  |  |  |
Balance at December 31, 2022 | $ | (9) |  |  | $ | (9) |  |  | $ | (18) |
Current period change | 8 |  |  | (7) |  |  | 1 |
Balance at December 31, 2023 | $ | (1) |  |  | $ | (16) |  |  | $ | (17) |
Southern Company Gas |  |  |  |  |
Balance at December 31, 2022 | $ | (25) |  |  | $ | 56 |  |  | $ | 31 |
Current period change | 1 |  |  | (16) |  |  | (15) |
Balance at December 31, 2023 | $ | (24) |  |  | $ | 40 |  |  | $ | 16 |
(*)May not add due to rounding.

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