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Regulatory Matters (Tables) | 6 Months Ended
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Jun. 30, 2023
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, 2023 and December 31, 2022 were as follows:
Regulatory Clause | Balance Sheet Line Item | June 30, 2023 | December 31, 2022
|  | (in millions)
Alabama Power |  |  |
Rate CNP Compliance | Other regulatory assets, current | $ | 20 |  | $ | 47 |
| Other regulatory assets, deferred | 40 |  | — |
Rate CNP PPA | Other regulatory assets, current | 17 |  | 18 |
| Other regulatory assets, deferred | 95 |  | 102 |
Retail Energy Cost Recovery | Other regulatory assets, current | 146 |  | 102 |
| Other regulatory assets, deferred | 283 |  | 520 |
Georgia Power |  |  |
Fuel Cost Recovery(*) | Receivables – under recovered fuel clause revenues | $ | 695 |  | $ | — |
| Deferred under recovered fuel clause revenues | 1,489 |  | 2,056 |
Mississippi Power |  |  |
Fuel Cost Recovery | Receivables – customer accounts, net | $ | 24 |  | $ | 1 |
Ad Valorem Tax | Other regulatory assets, current | 6 |  | 12 |
| Other regulatory assets, deferred | 16 |  | 19 |
Southern Company Gas |  |  |
Natural Gas Cost Recovery | Natural gas cost under recovery | $ | — |  | $ | 108 |
| Natural gas cost over recovery | 161 |  | — |
(*)See "Georgia Power – Fuel Cost Recovery" herein for additional information.
Nuclear Construction Cost and Schedule | Georgia Power's approximate proportionate share of the remaining estimated capital cost to complete Plant Vogtle Units 3 and 4, including contingency, through July 2023 and March 2024, respectively, is as follows:
| (in millions)
Base project capital cost forecast(a)(b) | $ | 10,576 |
Construction contingency estimate | 17 |
Total project capital cost forecast(a)(b) | 10,593 |
Net investment at June 30, 2023(b) | (9,944) |
Remaining estimate to complete | $ | 649 |
(a)Includes approximately $610 million of costs that are not shared with the other Vogtle Owners, including $33 million of construction monitoring costs approved for recovery by the Georgia PSC in its nineteenth VCM order, and approximately $407 million of incremental costs under the cost-sharing and tender provisions of the joint ownership agreements described below. Excludes financing costs expected to be capitalized through AFUDC of approximately $422 million, of which $365 million had been accrued through June 30, 2023. (b)Net of $1.7 billion received from Toshiba under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds.
Schedule of Infrastructure Replacement Programs and Capital Projects | Capital expenditures incurred under specific infrastructure replacement programs and capital projects during the first six months of 2023 were as follows:
Utility | Program | Six Months Ended June 30, 2023
|  | (in millions)
Nicor Gas | Investing in Illinois | $ | 196 |
Virginia Natural Gas | SAVE | 37 |
Atlanta Gas Light | System Reinforcement Rider | 57 |
Chattanooga Gas | Pipeline Replacement Program | 4 |
Total |  | $ | 294 |

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