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Regulatory Matters (Tables) | 6 Months Ended
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Jun. 30, 2024
Regulated Operations [Abstract] |
Schedule of Cost Recovery Clauses | The recovery balances for certain retail regulatory clauses of the traditional electric operating companies and Southern Company Gas at June 30, 2024 and December 31, 2023 were as follows:
Regulatory Clause | Balance Sheet Line Item | June 30, 2024 | December 31, 2023
|  | (in millions)
Alabama Power |  |  |
Rate CNP Compliance | Other regulatory assets, current | $ | — |  | $ | 8 |
| Other regulatory assets, deferred | 46 |  | 25 |
Rate CNP PPA | Other regulatory assets, current | 18 |  | 18 |
| Other regulatory assets, deferred | 76 |  | 85 |
Rate ECR | Regulatory assets – under recovered retail fuel clause revenues | 115 |  | 246 |
Georgia Power |  |  |
Fuel Cost Recovery | Receivables – under recovered retail fuel clause revenues | $ | 671 |  | $ | 694 |
| Deferred under recovered retail fuel clause revenues | 950 |  | 1,211 |
Mississippi Power |  |  |
Fuel Cost Recovery(*) | Receivables – customer accounts, net | $ | 16 |  | $ | — |
| Deferred under recovered retail fuel clause revenues | — |  | 50 |
| Over recovered retail fuel clause revenues | — |  | 27 |
Ad Valorem Tax | Other regulatory assets, deferred | 15 |  | 12 |
Southern Company Gas |  |  |
Natural Gas Cost Recovery | Natural gas cost over recovery | $ | 171 |  | $ | 214 |
(*)Mississippi Power also has wholesale MRA and Market Based (MB) fuel cost recovery factors. At June 30, 2024 and December 31, 2023, wholesale MRA fuel costs were over recovered $11 million and $5 million, respectively, and were included in other current liabilities on Mississippi Power's balance sheets. The wholesale MB fuel cost recovery was immaterial for both periods presented.
Nuclear Construction Cost and Schedule | Georgia Power's net capital costs incurred through June 30, 2024 in connection with Plant Vogtle Units 3 and 4, and its approximate proportionate share of additional capital costs to be incurred after June 30, 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 June 30, 2024(b) | (10,641) |
Remaining estimate to complete | $ | 91 |
(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.

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