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REVENUE FROM CONTRACTS WITH CUSTOMERS | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
REVENUE FROM CONTRACTS WITH CUSTOMERS | REVENUE FROM CONTRACTS WITH CUSTOMERS The Registrants generate revenues from a variety of sources, some of which are not accounted for as revenue from contracts with customers, such as leases, derivatives, and certain cost recovery mechanisms. See Note 1 under "Revenues" for additional information on the revenue policies of the Registrants. See Notes 9 and 14 for additional information on revenue accounted for under lease and derivative accounting guidance, respectively. The following table disaggregates revenue from contracts with customers for the periods presented:
| Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
2021 |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Retail electric revenues |  |  |  |  |  |
Residential | $ | 6,207 |  | $ | 2,467 |  | $ | 3,471 |  | $ | 269 |  | $ | — |  | $ | — |
Commercial | 4,877 |  | 1,600 |  | 3,010 |  | 267 |  | — |  | — |
Industrial | 3,067 |  | 1,386 |  | 1,391 |  | 290 |  | — |  | — |
Other | 93 |  | 17 |  | 68 |  | 8 |  | — |  | — |
Total retail electric revenues | 14,244 |  | 5,470 |  | 7,940 |  | 834 |  | — |  | — |
Natural gas distribution revenues |  |  |  |  |  |
Residential | 1,799 |  | — |  | — |  | — |  | — |  | 1,799 |
Commercial | 470 |  | — |  | — |  | — |  | — |  | 470 |
Transportation | 1,038 |  | — |  | — |  | — |  | — |  | 1,038 |
Industrial | 49 |  | — |  | — |  | — |  | — |  | 49 |
Other | 269 |  | — |  | — |  | — |  | — |  | 269 |
Total natural gas distribution revenues | 3,625 |  | — |  | — |  | — |  | — |  | 3,625 |
Wholesale electric revenues |  |  |  |  |  |
PPA energy revenues | 1,122 |  | 184 |  | 95 |  | 11 |  | 854 |  | — |
PPA capacity revenues | 493 |  | 115 |  | 55 |  | 5 |  | 323 |  | — |
Non-PPA revenues | 236 |  | 170 |  | 21 |  | 401 |  | 398 |  | — |
Total wholesale electric revenues | 1,851 |  | 469 |  | 171 |  | 417 |  | 1,575 |  | — |
Other natural gas revenues |  |  |  |  |  |
Wholesale gas services | 2,168 |  | — |  | — |  | — |  | — |  | 2,168 |
Gas marketing services | 464 |  | — |  | — |  | — |  | — |  | 464 |
Other natural gas revenues | 36 |  | — |  | — |  | — |  | — |  | 36 |
Total natural gas revenues | 2,668 |  | — |  | — |  | — |  | — |  | 2,668 |
Other revenues | 1,075 |  | 202 |  | 452 |  | 31 |  | 30 |  | — |
Total revenue from contracts with customers | 23,463 |  | 6,141 |  | 8,563 |  | 1,282 |  | 1,605 |  | 6,293 |
Other revenue sources(a) | 3,349 |  | 272 |  | 697 |  | 40 |  | 611 |  | 1,786 |
Other adjustments(b) | (3,699) |  | — |  | — |  | — |  | — |  | (3,699) |
Total operating revenues | $ | 23,113 |  | $ | 6,413 |  | $ | 9,260 |  | $ | 1,322 |  | $ | 2,216 |  | $ | 4,380 |
| Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
2020 |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Retail electric revenues |  |  |  |  |  |
Residential | $ | 6,113 |  | $ | 2,377 |  | $ | 3,476 |  | $ | 260 |  | $ | — |  | $ | — |
Commercial | 4,699 |  | 1,512 |  | 2,933 |  | 254 |  | — |  | — |
Industrial | 2,775 |  | 1,293 |  | 1,197 |  | 285 |  | — |  | — |
Other | 90 |  | 21 |  | 60 |  | 9 |  | — |  | — |
Total retail electric revenues | 13,677 |  | 5,203 |  | 7,666 |  | 808 |  | — |  | — |
Natural gas distribution revenues |  |  |  |  |  |
Residential | 1,338 |  | — |  | — |  | — |  | — |  | 1,338 |
Commercial | 340 |  | — |  | — |  | — |  | — |  | 340 |
Transportation | 971 |  | — |  | — |  | — |  | — |  | 971 |
Industrial | 30 |  | — |  | — |  | — |  | — |  | 30 |
Other | 209 |  | — |  | — |  | — |  | — |  | 209 |
Total natural gas distribution revenues | 2,888 |  | — |  | — |  | — |  | — |  | 2,888 |
Wholesale electric revenues |  |  |  |  |  |
PPA energy revenues | 735 |  | 133 |  | 42 |  | 9 |  | 570 |  | — |
PPA capacity revenues | 454 |  | 108 |  | 50 |  | 3 |  | 296 |  | — |
Non-PPA revenues | 210 |  | 43 |  | 10 |  | 311 |  | 239 |  | — |
Total wholesale electric revenues | 1,399 |  | 284 |  | 102 |  | 323 |  | 1,105 |  | — |
Other natural gas revenues |  |  |  |  |  |
Wholesale gas services | 1,727 |  | — |  | — |  | — |  | — |  | 1,727 |
Gas marketing services | 391 |  | — |  | — |  | — |  | — |  | 391 |
Other natural gas revenues | 33 |  | — |  | — |  | — |  | — |  | 33 |
Total other natural gas revenues | 2,151 |  | — |  | — |  | — |  | — |  | 2,151 |
Other revenues | 982 |  | 159 |  | 447 |  | 26 |  | 14 |  | — |
Total revenue from contracts with customers | 21,097 |  | 5,646 |  | 8,215 |  | 1,157 |  | 1,119 |  | 5,039 |
Other revenue sources(a) | 3,764 |  | 184 |  | 94 |  | 15 |  | 614 |  | 2,881 |
Other adjustments(b) | (4,486) |  | — |  | — |  | — |  | — |  | (4,486) |
Total operating revenues | $ | 20,375 |  | $ | 5,830 |  | $ | 8,309 |  | $ | 1,172 |  | $ | 1,733 |  | $ | 3,434 |
| Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
2019 |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Retail electric revenues |  |  |  |  |  |
Residential | $ | 6,164 |  | $ | 2,509 |  | $ | 3,377 |  | $ | 278 |  | $ | — |  | $ | — |
Commercial | 5,065 |  | 1,677 |  | 3,097 |  | 291 |  | — |  | — |
Industrial | 3,126 |  | 1,460 |  | 1,360 |  | 306 |  | — |  | — |
Other | 90 |  | 25 |  | 54 |  | 11 |  | — |  | — |
Total retail electric revenues | 14,445 |  | 5,671 |  | 7,888 |  | 886 |  | — |  | — |
Natural gas distribution revenues |  |  |  |  |  |
Residential | 1,413 |  | — |  | — |  | — |  | — |  | 1,413 |
Commercial | 389 |  | — |  | — |  | — |  | — |  | 389 |
Transportation | 907 |  | — |  | — |  | — |  | — |  | 907 |
Industrial | 35 |  | — |  | — |  | — |  | — |  | 35 |
Other | 245 |  | — |  | — |  | — |  | — |  | 245 |
Total natural gas distribution revenues | 2,989 |  | — |  | — |  | — |  | — |  | 2,989 |
Wholesale electric revenues |  |  |  |  |  |
PPA energy revenues | 833 |  | 145 |  | 60 |  | 11 |  | 648 |  | — |
PPA capacity revenues | 453 |  | 102 |  | 54 |  | 3 |  | 322 |  | — |
Non-PPA revenues | 232 |  | 81 |  | 9 |  | 352 |  | 238 |  | — |
Total wholesale electric revenues | 1,518 |  | 328 |  | 123 |  | 366 |  | 1,208 |  | — |
Other natural gas revenues |  |  |  |  |  |
Gas pipeline investments | 32 |  | — |  | — |  | — |  | — |  | 32 |
Wholesale gas services | 2,095 |  | — |  | — |  | — |  | — |  | 2,095 |
Gas marketing services | 440 |  | — |  | — |  | — |  | — |  | 440 |
Other natural gas revenues | 42 |  | — |  | — |  | — |  | — |  | 42 |
Total other natural gas revenues | 2,609 |  | — |  | — |  | — |  | — |  | 2,609 |
Other revenues | 1,035 |  | 153 |  | 407 |  | 19 |  | 12 |  | — |
Total revenue from contracts with customers | 22,596 |  | 6,152 |  | 8,418 |  | 1,271 |  | 1,220 |  | 5,598 |
Other revenue sources(a) | 4,266 |  | (27) |  | (10) |  | (7) |  | 718 |  | 3,637 |
Other adjustments(b) | (5,443) |  | — |  | — |  | — |  | — |  | (5,443) |
Total operating revenues | $ | 21,419 |  | $ | 6,125 |  | $ | 8,408 |  | $ | 1,264 |  | $ | 1,938 |  | $ | 3,792 |
(a)Other revenue sources relate to revenues from customers accounted for as derivatives and leases, alternative revenue programs at Southern Company Gas, and cost recovery mechanisms and revenues that meet other scope exceptions for revenues from contracts with customers at the traditional electric operating companies. (b)Other adjustments relate to the cost of Southern Company Gas' energy and risk management activities. Wholesale gas services revenues are presented net of the related costs of those activities on the statement of income. See Notes 15 and 16 under "Southern Company Gas" for information on the sale of Sequent and components of wholesale gas services' operating revenues, respectively. Contract Balances The following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers at December 31, 2021 and 2020:
| Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
Accounts Receivable |  |  |  |  |  |
At December 31, 2021 | $ | 2,504 |  | $ | 589 |  | $ | 736 |  | $ | 73 |  | $ | 149 |  | $ | 753 |
At December 31, 2020 | 2,614 |  | 632 |  | 806 |  | 77 |  | 112 |  | 788 |
Contract Assets |  |  |  |  |  |
At December 31, 2021 | $ | 117 |  | $ | 2 |  | $ | 63 |  | $ | — |  | $ | 1 |  | $ | — |
At December 31, 2020 | 158 |  | 2 |  | 71 |  | — |  | — |  | — |
Contract Liabilities |  |  |  |  |  |
At December 31, 2021 | $ | 57 |  | $ | 4 |  | $ | 14 |  | $ | — |  | $ | 1 |  | $ | — |
At December 31, 2020 | 61 |  | 6 |  | 27 |  | 1 |  | 1 |  | 1 |
At December 31, 2021 and 2020, Georgia Power had contract assets primarily related to retail customer fixed bill programs, where the payment is contingent upon Georgia Power's continued performance and the customer's continued participation in the program over a one-year contract term, and unregulated service agreements, where payment is contingent on project completion. Contract liabilities for Georgia Power relate to cash collections recognized in advance of revenue for unregulated service agreements. Southern Company's unregulated distributed generation business had contract assets of $50 million and $81 million at December 31, 2021 and 2020, respectively, and contract liabilities of $39 million and $27 million at December 31, 2021 and 2020, respectively, for outstanding performance obligations. Revenues recognized in 2021 and 2020, which were included in contract liabilities at December 31, 2020 and December 31, 2019, respectively, were $29 million and $33 million, respectively, for Southern Company and immaterial for the other Registrants. Remaining Performance Obligations The traditional electric operating companies and Southern Power have long-term contracts with customers in which revenues are recognized as performance obligations are satisfied over the contract term. These contracts primarily relate to PPAs whereby the traditional electric operating companies and Southern Power provide electricity and generation capacity to a customer. The revenue recognized for the delivery of electricity is variable; however, certain PPAs include a fixed payment for fixed generation capacity over the term of the contract. Southern Company's unregulated distributed generation business also has partially satisfied performance obligations related to certain fixed price contracts. Revenues from contracts with customers related to these performance obligations remaining at December 31, 2021 are expected to be recognized as follows:
| 2022 | 2023 | 2024 | 2025 | 2026 | Thereafter
| (in millions)
Southern Company | $ | 577 |  | $ | 462 |  | $ | 341 |  | $ | 319 |  | $ | 295 |  | $ | 2,309 |
Alabama Power | 33 |  | 24 |  | 7 |  | 5 |  | — |  | — |
Georgia Power | 68 |  | 48 |  | 25 |  | 22 |  | 11 |  | 31 |
Southern Power | 331 |  | 293 |  | 309 |  | 292 |  | 287 |  | 2,294 |
Revenue expected to be recognized for performance obligations remaining at December 31, 2021 was immaterial for Mississippi Power.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 + Details
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