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REVENUE FROM CONTRACTS WITH CUSTOMERS
 12 Months Ended
Dec. 31, 2023
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 CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2023
Operating revenues
Retail electric revenues
Residential$7,309 $2,904 $4,105 $300 $— $— 
Commercial5,860 1,928 3,624 308 — — 
Industrial3,613 1,721 1,558 334 — — 
Other112 12 91 9 — — 
Total retail electric revenues16,894 6,565 9,378 951 — — 
Natural gas distribution revenues
Residential1,981 — — — — 1,981 
Commercial505 — — — — 505 
Transportation1,184 — — — — 1,184 
Industrial 45 — — — — 45 
Other324 — — — — 324 
Total natural gas distribution revenues4,039 — — — — 4,039 
Wholesale electric revenues
PPA energy revenues1,107 234 87 20 790 — 
PPA capacity revenues624 156 51 45 376 — 
Non-PPA revenues250 65 35 407 409 — 
Total wholesale electric revenues1,981 455 173 472 1,575 — 
Other natural gas revenues
Gas marketing services528 — — — — 528 
Other natural gas revenues31 — — — — 31 
Total natural gas revenues559 — — — — 559 
Other revenues1,355 213 578 39 55 — 
Total revenue from contracts with customers24,828 7,233 10,129 1,462 1,630 4,598 
Other revenue sources(a)
425 (183)(11)12 559 104 
Total operating revenues$25,253 $7,050 $10,118 $1,474 $2,189 $4,702 
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2022
Operating revenues
Retail electric revenues
Residential$6,604 $2,638 $3,664 $302 $— $— 
Commercial5,369 1,685 3,385 299 — — 
Industrial3,764 1,507 1,921 336 — — 
Other102 14 79 9 — — 
Total retail electric revenues15,839 5,844 9,049 946 — — 
Natural gas distribution revenues
Residential2,843 — — — — 2,843 
Commercial763 — — — — 763 
Transportation1,186 — — — — 1,186 
Industrial 84 — — — — 84 
Other342 — — — — 342 
Total natural gas distribution revenues5,218 — — — — 5,218 
Wholesale electric revenues
PPA energy revenues2,274 489 130 16 1,673 — 
PPA capacity revenues596 194 47 4 356 — 
Non-PPA revenues250 200 30 690 740 — 
Total wholesale electric revenues3,120 883 207 710 2,769 — 
Other natural gas revenues
Gas marketing services636 — — — — 636 
Other natural gas revenues51 — — — — 51 
Total other natural gas revenues687 — — — — 687 
Other revenues1,077 194 446 47 36 — 
Total revenue from contracts with customers25,941 6,921 9,702 1,703 2,805 5,905 
Other revenue sources(a)
3,338 896 1,882 (9)564 57 
Total operating revenues$29,279 $7,817 $11,584 $1,694 $3,369 $5,962 
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2021
Operating revenues
Retail electric revenues
Residential$6,207 $2,467 $3,471 $269 $— $— 
Commercial4,877 1,600 3,010 267 — — 
Industrial3,067 1,386 1,391 290 — — 
Other93 17 68 8 — — 
Total retail electric revenues14,244 5,470 7,940 834 — — 
Natural gas distribution revenues
Residential1,799 — — — — 1,799 
Commercial470 — — — — 470 
Transportation1,038 — — — — 1,038 
Industrial49 — — — — 49 
Other269 — — — — 269 
Total natural gas distribution revenues3,625 — — — — 3,625 
Wholesale electric revenues
PPA energy revenues1,122 184 95 11 854 — 
PPA capacity revenues493 115 55 5 323 — 
Non-PPA revenues236 170 21 401 398 — 
Total wholesale electric revenues1,851 469 171 417 1,575 — 
Other natural gas revenues
Wholesale gas services2,168 — — — — 2,168 
Gas marketing services464 — — — — 464 
Other natural gas revenues36 — — — — 36 
Total other natural gas revenues2,668 — — — — 2,668 
Other revenues1,075 202 452 31 30 — 
Total revenue from contracts with customers23,463 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 
(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 (including those related to fuel costs) 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, 2023 and 2022:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Accounts Receivable
At December 31, 2023$2,820 $821 $1,011 $90 $122 $684 
At December 31, 20223,123 696 922 92 237 1,107 
Contract Assets
At December 31, 2023$271 $2 $121 $— $— $56 
At December 31, 2022156 2 89 — — — 
Contract Liabilities
At December 31, 2023$116 $— $1 $— $4 $— 
At December 31, 202245 4 9 — 1 — 
Contract assets for Georgia Power primarily relate 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 primarily relate to cash collections recognized in advance of revenue for unregulated service agreements. Southern Company Gas' contract assets relate to work performed on an energy efficiency enhancement and upgrade contract with the U.S. General Services Administration. Southern Company Gas receives cash advances from a third-party financial institution to fund work performed, of which approximately $59 million had been received at December 31, 2023. These advances have been accounted for as long-term debt on the balance sheets. See Note 1 under "Affiliate Transactions" for additional information regarding the construction contract. At December 31, 2023 and 2022, Southern Company's unregulated distributed generation business had contract assets of $91 million and $65 million, respectively, and contract liabilities of $115 million and $32 million, respectively, for outstanding performance obligations.
Revenues recognized in 2023 and 2022, which were included in contract liabilities at December 31, 2023 and 2022, respectively, were $36 million annually for Southern Company and immaterial for the other Registrants. Contract liabilities are primarily classified as current on the balance sheets as the corresponding revenues are generally expected to be recognized within one year.
Remaining Performance Obligations
The Subsidiary Registrants may enter into long-term contracts with customers in which revenues are recognized as performance obligations are satisfied over the contract term. For the traditional electric operating companies and Southern Power, these contracts primarily relate to PPAs whereby electricity and generation capacity are provided 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. For Southern Company Gas, these contracts primarily relate to the U.S. General Services Administration contract described above. 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, 2023 are expected to be recognized as follows:
20242025202620272028Thereafter
(in millions)
Southern Company$940 $552 $338 $332 $323 $2,045 
Alabama Power23 9 — — — — 
Georgia Power73 41 14 15 15 9 
Mississippi Power60 63 66 69 73 — 
Southern Power379 301 299 306 297 2,041 
Southern Company Gas26 — — — — —