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PROPERTY, PLANT, AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | The Registrants' property, plant, and equipment in service consisted of the following at December 31, 2023 and 2022:
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 |
At December 31, 2022: | Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
Electric utilities: |  |  |  |  |  |
Generation | $ | 51,756 |  | $ | 15,920 |  | $ | 17,755 |  | $ | 2,826 |  | $ | 14,619 |  | $ | — |
Transmission | 14,201 |  | 5,658 |  | 7,576 |  | 927 |  | — |  | — |
Distribution | 24,200 |  | 9,154 |  | 13,819 |  | 1,228 |  | — |  | — |
General/other | 5,806 |  | 2,740 |  | 2,729 |  | 273 |  | 39 |  | — |
Electric utilities' plant in service | 95,963 |  | 33,472 |  | 41,879 |  | 5,254 |  | 14,658 |  | — |
Southern Company Gas: |  |  |  |  |  |
Natural gas transportation and distribution | 16,810 |  | — |  | — |  | — |  | — |  | 16,810 |
Storage facilities | 1,553 |  | — |  | — |  | — |  | — |  | 1,553 |
Other | 1,360 |  | — |  | — |  | — |  | — |  | 1,360 |
Southern Company Gas plant in service | 19,723 |  | — |  | — |  | — |  | — |  | 19,723 |
Other plant in service | 1,843 |  | — |  | — |  | — |  | — |  | — |
Total plant in service | $ | 117,529 |  | $ | 33,472 |  | $ | 41,879 |  | $ | 5,254 |  | $ | 14,658 |  | $ | 19,723 |
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
Deferred cloud implementation costs | At December 31, 2023 and 2022, deferred cloud implementation costs, net of amortization, which are generally included in other deferred charges and assets on the Registrants' balance sheets, are 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, 2023 | $ | 325 |  | $ | 85 |  | $ | 99 |  | $ | 13 |  | $ | 15 |  | $ | 43 |
At December 31, 2022 | 345 |  | 81 |  | 108 |  | 14 |  | 18 |  | 54 |
Composite straight-line rates | 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 | %
Ownership and investment in jointly-owned facilities | At December 31, 2023, the Registrants' percentage ownership and investment (exclusive of nuclear fuel) in jointly-owned facilities in commercial operation were as follows:
Facility (Type) | Percent Ownership |  | Plant in Service |  | Accumulated Depreciation |  | CWIP
|  |  | (in millions)
Alabama Power |  |  |  |  |  |  |
Greene County (natural gas) Units 1 and 2 | 60.0 | % | (a) | $ | 191 |  |  | $ | 113 |  |  | $ | 1 |
Plant Miller (coal) Units 1 and 2 | 91.8 |  | (b) | 2,156 |  |  | 778 |  |  | 40 |
Georgia Power |  |  |  |  |  |  |
Plant Hatch (nuclear) Units 1 and 2 | 50.1 | % | (c) | $ | 1,446 |  |  | $ | 659 |  |  | $ | 70 |
Plant Vogtle (nuclear) Units 1 and 2 | 45.7 |  | (c) | 3,664 |  |  | 2,331 |  |  | 62 |
Plant Vogtle (nuclear) Units 3 and 4 | 45.7 |  | (c)(d) | 4,613 |  |  | 19 |  |  | 3,232 |
Plant Scherer (coal) Units 1 and 2 | 8.4 |  | (c) | 287 |  |  | 123 |  |  | 2 |
Plant Scherer (coal) Unit 3 | 75.0 |  | (c) | 1,310 |  |  | 639 |  |  | 10 |
Rocky Mountain (pumped storage) | 25.4 |  | (e) | 181 |  |  | 153 |  |  | — |
Mississippi Power |  |  |  |  |  |  |
Greene County (natural gas) Units 1 and 2 | 40.0 | % | (a) | $ | 125 |  |  | $ | 80 |  |  | $ | — |
Plant Daniel (coal) Units 1 and 2 | 50.0 |  | (f) | 805 |  |  | 281 |  |  | 1 |
Southern Company Gas |  |  |  |  |  |  |
Dalton Pipeline (natural gas pipeline) | 50.0 | % | (g) | $ | 271 |  |  | $ | 27 |  |  | $ | — |
(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 JEA. 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)Unit 4 remains under construction. See Note 2 under "Georgia Power – Nuclear Construction" for additional information. (e)Jointly owned with OPC, which is the operator of the plant. (f)Jointly owned by FP&L and Mississippi Power. 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 3 under "Other Matters – Mississippi Power – Plant Daniel" for additional information. (g)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.

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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