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PROPERTY, PLANT, AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | The Registrants' property, plant, and equipment in service consisted of the following at December 31, 2021 and 2020:
At December 31, 2021: | Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
Electric utilities: |  |  |  |  |  |
Generation | $ | 53,803 |  | $ | 16,631 |  | $ | 19,184 |  | $ | 2,791 |  | $ | 14,551 |  | $ | — |
Transmission | 13,406 |  | 5,334 |  | 7,132 |  | 900 |  | — |  | — |
Distribution | 22,236 |  | 8,643 |  | 12,437 |  | 1,156 |  | — |  | — |
General/other | 5,423 |  | 2,527 |  | 2,579 |  | 259 |  | 34 |  | — |
Electric utilities' plant in service | 94,868 |  | 33,135 |  | 41,332 |  | 5,106 |  | 14,585 |  | — |
Southern Company Gas: |  |  |  |  |  |
Natural gas distribution utilities transportation and distribution | 15,714 |  | — |  | — |  | — |  | — |  | 15,714 |
Storage facilities | 1,315 |  | — |  | — |  | — |  | — |  | 1,315 |
Other | 1,851 |  | — |  | — |  | — |  | — |  | 1,851 |
Southern Company Gas plant in service | 18,880 |  | — |  | — |  | — |  | — |  | 18,880 |
Other plant in service | 1,844 |  | — |  | — |  | — |  | — |  | — |
Total plant in service | $ | 115,592 |  | $ | 33,135 |  | $ | 41,332 |  | $ | 5,106 |  | $ | 14,585 |  | $ | 18,880 |
At December 31, 2020: | Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
Electric utilities: |  |  |  |  |  |
Generation | $ | 52,179 |  | $ | 16,201 |  | $ | 18,675 |  | $ | 2,819 |  | $ | 13,872 |  | $ | — |
Transmission | 12,879 |  | 5,033 |  | 6,951 |  | 856 |  | — |  | — |
Distribution | 20,958 |  | 8,248 |  | 11,622 |  | 1,088 |  | — |  | — |
General/other | 5,072 |  | 2,334 |  | 2,434 |  | 248 |  | 32 |  | — |
Electric utilities' plant in service | 91,088 |  | 31,816 |  | 39,682 |  | 5,011 |  | 13,904 |  | — |
Southern Company Gas: |  |  |  |  |  |
Natural gas distribution utilities transportation and distribution | 14,610 |  | — |  | — |  | — |  | — |  | 14,610 |
Storage facilities | 1,752 |  | — |  | — |  | — |  | — |  | 1,752 |
Other | 1,249 |  | — |  | — |  | — |  | — |  | 1,249 |
Southern Company Gas plant in service | 17,611 |  | — |  | — |  | — |  | — |  | 17,611 |
Other plant in service | 1,817 |  | — |  | — |  | — |  | — |  | — |
Total plant in service | $ | 110,516 |  | $ | 31,816 |  | $ | 39,682 |  | $ | 5,011 |  | $ | 13,904 |  | $ | 17,611 |
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 30 years
Deferred cloud implementation costs | At December 31, 2021 and 2020, deferred cloud implementation costs, 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: |  |  |  |  |  |
At December 31, 2021 | $ | 240 |  | $ | 54 |  | $ | 81 |  | $ | 11 |  | $ | 14 |  | $ | 35 |
At December 31, 2020 | 162 |  | 38 |  | 58 |  | 7 |  | 9 |  | 17 |
Composite straight-line rates | Costs for these services from SCS in 2021, 2020, and 2019 were as follows:
| Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
2021 | $ | 504 |  | $ | 663 |  | $ | 120 |  | $ | 89 |  | $ | 239 |
2020 | 478 |  | 639 |  | 149 |  | 87 |  | 237 |
2019 | 527 |  | 704 |  | 118 |  | 90 |  | 183 |
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)
2021 | $ | 9 |  | $ | 15 |
2020 | 4 |  | 8 |
2019 | 3 |  | 14 |
Transportation costs under these agreements in 2021, 2020, and 2019 were as follows:
| Alabama Power | Georgia Power | Southern Power | Southern Company Gas
| (in millions)
2021 | $ | 14 |  | $ | 108 |  | $ | 31 |  | $ | 29 |
2020 | 15 |  | 108 |  | 29 |  | 29 |
2019 | 17 |  | 99 |  | 28 |  | 31 |
The approximate rates for 2021, 2020, and 2019 are as follows:
| 2021 | 2020 | 2019
Alabama Power | 2.7 | % | 2.6 | % | 3.1 | %
Georgia Power | 3.3 | % | 3.0 | % | 2.6 | %
Mississippi Power | 3.6 | % | 3.7 | % | 3.7 | %
Southern Company Gas | 2.8 | % | 2.8 | % | 2.9 | %
Ownership and investment in jointly-owned facilities | At December 31, 2021, 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 |  |  | $ | 79 |  |  | $ | 1 |
Plant Miller (coal) Units 1 and 2 | 91.8 |  | (b) | 2,133 |  |  | 665 |  |  | 15 |
Georgia Power |  |  |  |  |  |  |
Plant Hatch (nuclear) | 50.1 | % | (c) | $ | 1,382 |  |  | $ | 647 |  |  | $ | 42 |
Plant Vogtle (nuclear) Units 1 and 2 | 45.7 |  | (c) | 3,611 |  |  | 2,265 |  |  | 86 |
Plant Scherer (coal) Units 1 and 2 | 8.4 |  | (c) | 276 |  |  | 100 |  |  | 1 |
Plant Scherer (coal) Unit 3 | 75.0 |  | (c) | 1,314 |  |  | 539 |  |  | 8 |
Plant Wansley (coal) | 53.5 |  | (c) | 1,070 |  |  | 472 |  |  | 7 |
Rocky Mountain (pumped storage) | 25.4 |  | (d) | 184 |  |  | 148 |  |  | 1 |
Mississippi Power |  |  |  |  |  |  |
Greene County (natural gas) Units 1 and 2 | 40.0 | % | (a) | $ | 124 |  |  | $ | 61 |  |  | $ | — |
Plant Daniel (coal) Units 1 and 2 | 50.0 |  | (e) | 762 |  |  | 237 |  |  | 19 |
Southern Company Gas |  |  |  |  |  |  |
Dalton Pipeline (natural gas pipeline) | 50.0 | % | (f) | $ | 271 |  |  | $ | 19 |  |  | $ | — |
(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 Units 1 and 2, Scherer, and Wansley in varying amounts jointly with one or more of the following entities: OPC, MEAG Power, Dalton, Florida Power & Light Company, JEA, and Gulf Power. 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 by Gulf Power and Mississippi Power. In accordance with the operating agreement, Mississippi Power acts as Gulf Power's agent with respect to the operation and maintenance of these units. See Note 3 under "Other Matters – Mississippi Power – Plant Daniel" for information regarding a commitment between Mississippi Power and Gulf Power to seek a restructuring of their 50% undivided ownership interests in Plant Daniel. (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.

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