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Derivatives (Tables) | 9 Months Ended
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Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Energy-Related Derivatives | At September 30, 2025, the net volume of energy-related derivative contracts for natural gas positions, together with the longest hedge date over which the respective entity is hedging its exposure to the variability in future cash flows for forecasted transactions and the longest non-hedge date for derivatives not designated as hedges, were as follows:
| Net Purchased mmBtu |  | Longest Hedge Date |  | Longest Non-Hedge Date
| (in millions) |  |  |  |
Southern Company(*) | 443 |  | 2030 |  | 2028
Alabama Power | 132 |  | 2028 |  | —
Georgia Power | 123 |  | 2028 |  | —
Mississippi Power | 101 |  | 2029 |  | —
Southern Power | 9 |  | 2030 |  | 2025
Southern Company Gas(*) | 78 |  | 2028 |  | 2028
(*)Southern Company Gas' derivative instruments include both long and short natural gas positions. A long position is a contract to purchase natural gas and a short position is a contract to sell natural gas. Southern Company Gas' volume represents the net of 96 million mmBtu long natural gas positions and 18 million mmBtu short natural gas positions at September 30, 2025, which is also included in Southern Company's total volume.
Schedule of Interest Rate Derivatives | At September 30, 2025, the following interest rate derivatives were outstanding:
| Notional Amount | Weighted Average Interest Rate Paid | Interest Rate Received | Hedge Maturity Date | Fair Value Gain (Loss) at September 30, 2025
| (in millions) |  |  |  | (in millions)
Fair Value Hedges of Existing Debt |  |  |  |
Southern Company parent | $ | 400 |  | 1-day SOFR + 0.80% | 1.75% | March 2028 | $ | (23) |
Southern Company parent | 1,000 |  | 1-day SOFR + 2.48% | 3.70% | April 2030 | (108) |
Southern Company parent | 565 |  | 1-day SOFR + 1.56% | 6.50% | March 2045 | 3 |
Southern Company Gas | 500 |  | 1-day SOFR + 0.49% | 1.75% | January 2031 | (56) |
Southern Company | $ | 2,465 |  |  |  |  | $ | (184) |
Schedule of Foreign Currency Derivatives | At September 30, 2025, the following foreign currency derivatives were outstanding:
| Pay Notional | Pay Rate | Receive Notional | Receive Rate | Hedge Maturity Date | Fair Value Gain (Loss) at September 30, 2025
| (in millions) |  | (in millions) |  |  | (in millions)
Cash Flow Hedges of Existing Debt |  |  |  |  |
Southern Power | $ | 564 |  | 3.78% | € | 500 |  | 1.85% | June 2026 | $ | 20 |
Fair Value Hedges of Existing Debt |  |  |  |  |
Southern Company parent | 1,476 |  | 3.39% | 1,250 |  | 1.88% | September 2027 | (10) |
Southern Company | $ | 2,040 |  |  | € | 1,750 |  |  |  | $ | 10 |
Schedule of Derivative Category and Balance Sheet Location | The fair value of energy-related derivatives, interest rate derivatives, and foreign currency derivatives was reflected as either assets or liabilities in the balance sheets (included in "Other" or shown separately as "Risk Management Activities") as follows:
| At September 30, 2025 | At December 31, 2024
Derivative Category and Balance Sheet Location | Assets | Liabilities | Assets | Liabilities
| (in millions)
Southern Company |  |  |  |
Energy-related derivatives designated as hedging instruments for regulatory purposes |  |  |  |
Current | $ | 34 |  | $ | 44 |  | $ | 33 |  | $ | 82 |
Non-current | 51 |  | 32 |  | 42 |  | 40 |
Total derivatives designated as hedging instruments for regulatory purposes | 85 |  | 76 |  | 75 |  | 122 |
Derivatives designated as hedging instruments in cash flow and fair value hedges |  |  |  |
Energy-related derivatives: |  |  |  |
Current | 2 |  | 6 |  | 4 |  | 3 |
Non-current | 4 |  | — |  | 4 |  | — |
Interest rate derivatives: |  |  |  |
Current | 7 |  | 53 |  | — |  | 61 |
Non-current | — |  | 138 |  | — |  | 208 |
Foreign currency derivatives: |  |  |  |
Current | 20 |  | 21 |  | — |  | 36 |
Non-current | 11 |  | — |  | — |  | 182 |
Total derivatives designated as hedging instruments in cash flow and fair value hedges | 44 |  | 218 |  | 8 |  | 490 |
Energy-related derivatives not designated as hedging instruments |  |  |  |
Current | 13 |  | 7 |  | 5 |  | 3 |
Non-current | — |  | — |  | 1 |  | — |
Total derivatives not designated as hedging instruments | 13 |  | 7 |  | 6 |  | 3 |
Gross amounts recognized | 142 |  | 301 |  | 89 |  | 615 |
Gross amounts offset(a) | (54) |  | (63) |  | (44) |  | (61) |
Net amounts recognized in the Balance Sheets(b) | $ | 88 |  | $ | 238 |  | $ | 45 |  | $ | 554 |
Alabama Power |  |  |  |
Energy-related derivatives designated as hedging instruments for regulatory purposes |  |  |  |
Current | $ | 13 |  | $ | 13 |  | $ | 11 |  | $ | 30 |
Non-current | 18 |  | 12 |  | 15 |  | 12 |
Total derivatives designated as hedging instruments for regulatory purposes | 31 |  | 25 |  | 26 |  | 42 |
Gross amounts offset | (17) |  | (17) |  | (19) |  | (19) |
Net amounts recognized in the Balance Sheets | $ | 14 |  | $ | 8 |  | $ | 7 |  | $ | 23 |
| At September 30, 2025 | At December 31, 2024
Derivative Category and Balance Sheet Location | Assets | Liabilities | Assets | Liabilities
| (in millions)
Georgia Power |  |  |  |
Energy-related derivatives designated as hedging instruments for regulatory purposes |  |  |  |
Current | $ | 8 |  | $ | 15 |  | $ | 6 |  | $ | 32 |
Non-current | 17 |  | 9 |  | 13 |  | 9 |
Total derivatives designated as hedging instruments for regulatory purposes | 25 |  | 24 |  | 19 |  | 41 |
Energy-related derivatives not designated as hedging instruments |  |  |  |
Current | 2 |  | — |  | — |  | 1 |
Gross amounts recognized | 27 |  | 24 |  | 19 |  | 42 |
Gross amounts offset | (16) |  | (16) |  | (15) |  | (15) |
Net amounts recognized in the Balance Sheets | $ | 11 |  | $ | 8 |  | $ | 4 |  | $ | 27 |
Mississippi Power |  |  |  |
Energy-related derivatives designated as hedging instruments for regulatory purposes |  |  |  |
Current | $ | 4 |  | $ | 12 |  | $ | 5 |  | $ | 15 |
Non-current | 16 |  | 11 |  | 14 |  | 19 |
Total derivatives designated as hedging instruments for regulatory purposes | 20 |  | 23 |  | 19 |  | 34 |
Gross amounts offset | (15) |  | (15) |  | (17) |  | (17) |
Net amounts recognized in the Balance Sheets | $ | 5 |  | $ | 8 |  | $ | 2 |  | $ | 17 |
Southern Power |  |  |  |
Derivatives designated as hedging instruments in cash flow hedges |  |  |  |
Energy-related derivatives: |  |  |  |
Current | $ | 1 |  | $ | 1 |  | $ | 1 |  | $ | — |
Non-current | 3 |  | — |  | 3 |  | — |
Foreign currency derivatives: |  |  |  |
Current | 20 |  | — |  | — |  | 11 |
Non-current | — |  | — |  | — |  | 40 |
Total derivatives designated as hedging instruments in cash flow hedges | 24 |  | 1 |  | 4 |  | 51 |
Net amounts recognized in the Balance Sheets | $ | 24 |  | $ | 1 |  | $ | 4 |  | $ | 51 |
| At September 30, 2025 | At December 31, 2024
Derivative Category and Balance Sheet Location | Assets | Liabilities | Assets | Liabilities
| (in millions)
Southern Company Gas |  |  |  |
Energy-related derivatives designated as hedging instruments for regulatory purposes |  |  |  |
Current | $ | 9 |  | $ | 4 |  | $ | 11 |  | $ | 5 |
Derivatives designated as hedging instruments in cash flow and fair value hedges |  |  |  |
Energy-related derivatives: |  |  |  |
Current | 1 |  | 5 |  | 3 |  | 3 |
Non-current | 1 |  | — |  | 1 |  | — |
Interest rate derivatives: |  |  |  |
Current | — |  | 13 |  | — |  | 17 |
Non-current | — |  | 43 |  | — |  | 67 |
Total derivatives designated as hedging instruments in cash flow and fair value hedges | 2 |  | 61 |  | 4 |  | 87 |
Energy-related derivatives not designated as hedging instruments |  |  |  |
Current | 11 |  | 7 |  | 5 |  | 2 |
Non-current | — |  | — |  | 1 |  | — |
Total derivatives not designated as hedging instruments | 11 |  | 7 |  | 6 |  | 2 |
Gross amounts recognized | 22 |  | 72 |  | 21 |  | 94 |
Gross amounts offset(a) | (6) |  | (15) |  | 7 |  | (10) |
Net amounts recognized in the Balance Sheets(b) | $ | 16 |  | $ | 57 |  | $ | 28 |  | $ | 84 |
(a)Gross amounts offset includes cash collateral held on deposit in broker margin accounts of $10 million and $17 million at September 30, 2025 and December 31, 2024, respectively. (b)Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives at September 30, 2025 and December 31, 2024.
Schedule of Pre-tax Effects of Unrealized Derivative Gains (Losses) | At September 30, 2025 and December 31, 2024, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivative instruments designated as regulatory hedging instruments and deferred were as follows:
Regulatory Hedge Unrealized Gain (Loss) Recognized in the Balance Sheet
Derivative Category and Balance Sheet Location | Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Company Gas
| (in millions)
At September 30, 2025: |  |  |  |  |
Energy-related derivatives: |  |  |  |  |
Other regulatory assets, current | $ | (24) |  | $ | (7) |  | $ | (8) |  | $ | (8) |  | $ | (1) |
Other regulatory assets, deferred | (1) |  | (1) |  | — |  | — |  | — |
Other regulatory liabilities, current | 13 |  | 7 |  | 1 |  | — |  | 5 |
Other regulatory liabilities, deferred | 20 |  | 7 |  | 8 |  | 5 |  | — |
Total energy-related derivative gains (losses) | $ | 8 |  | $ | 6 |  | $ | 1 |  | $ | (3) |  | $ | 4 |
At December 31, 2024: |  |  |  |  |
Energy-related derivatives: |  |  |  |  |
Other regulatory assets, current | $ | (61) |  | $ | (23) |  | $ | (26) |  | $ | (11) |  | $ | (1) |
Other regulatory assets, deferred | (5) |  | — |  | — |  | (5) |  | — |
Other regulatory liabilities, current | 8 |  | 4 |  | — |  | — |  | 4 |
Other regulatory liabilities, deferred | 8 |  | 3 |  | 4 |  | 1 |  | — |
Total energy-related derivative gains (losses) | $ | (50) |  | $ | (16) |  | $ | (22) |  | $ | (15) |  | $ | 3 |
Schedule of Pre-Tax Effects of Hedging on AOCI | For the three and nine months ended September 30, 2025 and 2024, the pre-tax effects of cash flow and fair value hedge accounting on accumulated OCI for the applicable Registrants were as follows:
Gain (Loss) Recognized in OCI on Derivatives | Three Months Ended September 30, | Nine Months Ended September 30,
2025 | 2024 | 2025 | 2024
| (in millions)
Southern Company |  |  |  |
Cash flow hedges: |  |  |  |
Energy-related derivatives | $ | (12) |  | $ | (7) |  | $ | (6) |  | $ | (11) |
Interest rate derivatives | (1) |  | (8) |  | 6 |  | 16 |
Foreign currency derivatives | (6) |  | 15 |  | 60 |  | (4) |
Fair value hedges(*): |  |  |  |
Foreign currency derivatives | 1 |  | (2) |  | (12) |  | (8) |
Total | $ | (18) |  | $ | (2) |  | $ | 48 |  | $ | (7) |
Georgia Power |  |  |  |
Cash flow hedges: |  |  |  |
Interest rate derivatives | $ | — |  | $ | 1 |  | $ | 3 |  | $ | 17 |
Mississippi Power |  |  |  |
Cash flow hedges: |  |  |  |
Interest rate derivatives | $ | — |  | $ | — |  | $ | — |  | $ | 7 |
Southern Power |  |  |  |
Cash flow hedges: |  |  |  |
Energy-related derivatives | $ | (2) |  | $ | (2) |  | $ | — |  | $ | (2) |
Foreign currency derivatives | (6) |  | 15 |  | 60 |  | (4) |
Total | $ | (8) |  | $ | 13 |  | $ | 60 |  | $ | (6) |
Southern Company Gas |  |  |  |
Cash flow hedges: |  |  |  |
Energy-related derivatives | $ | (10) |  | $ | (4) |  | $ | (6) |  | $ | (9) |
Interest rate derivatives | (1) |  | (6) |  | 3 |  | (5) |
Total | $ | (11) |  | $ | (10) |  | $ | (3) |  | $ | (14) |
(*)Represents amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded in OCI.
Schedule of Pre-Tax Effects of Cash Flow and Fair Value Hedging on Income | For the three and nine months ended September 30, 2025 and 2024, the pre-tax effects of cash flow and fair value hedge accounting on income were as follows:
|  | Gain (Loss)
Statements of Income Location | Derivative Category | Three Months Ended September 30, | Nine Months Ended September 30,
2025 | 2024 | 2025 | 2024
|  | (in millions)
Southern Company |  |  |  |  |
Fuel | Energy-related cash flow hedges | $ | — |  | $ | (3) |  | $ | 1 |  | $ | (5) |
Cost of natural gas | Energy-related cash flow hedges | (1) |  | (4) |  | (1) |  | (34) |
Other operations and maintenance | Energy-related cash flow hedges | — |  | — |  | — |  | (1) |
Interest expense, net of amounts capitalized | Interest rate cash flow hedges | (4) |  | (4) |  | (10) |  | (12) |
| Foreign currency cash flow hedges | (2) |  | (3) |  | (8) |  | (9) |
| Interest rate fair value hedges | 16 |  | 78 |  | 85 |  | 47 |
Other income (expense), net | Foreign currency cash flow hedges | 1 |  | 24 |  | 68 |  | 7 |
| Foreign currency fair value hedges | 5 |  | 58 |  | 160 |  | 79 |
| Amount excluded from effectiveness testing recognized in earnings | (1) |  | 3 |  | 12 |  | 8 |
Southern Power |  |  |  |  |
Fuel | Energy-related cash flow hedges | $ | — |  | $ | (3) |  | $ | 1 |  | $ | (5) |
Interest expense, net of amounts capitalized | Foreign currency cash flow hedges | (2) |  | (3) |  | (8) |  | (9) |
Other income (expense), net | Foreign currency cash flow hedges | 1 |  | 24 |  | 68 |  | 7 |
Southern Company Gas |  |  |  |  |
Cost of natural gas | Energy-related cash flow hedges | $ | (1) |  | $ | (4) |  | $ | (1) |  | $ | (34) |
Operations and maintenance | Energy-related cash flow hedges | — |  | — |  | — |  | (1) |
Interest expense, net of amounts capitalized | Interest rate cash flow hedges | — |  | — |  | (1) |  | — |
| Interest rate fair value hedges | 7 |  | 28 |  | 28 |  | 18 |
Schedule of Cumulative Basis Adjustments for Fair Value Hedges | At September 30, 2025 and December 31, 2024, the following amounts were recorded on the balance sheets related to cumulative basis adjustments for fair value hedges:
| Carrying Amount of the Hedged Item | Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item
Balance Sheet Location of Hedged Items | At September 30, 2025 | At December 31, 2024 | At September 30, 2025 | At December 31, 2024
| (in millions)
Southern Company |  |  |  |
Long-term debt | $ | (3,733) |  | $ | (2,936) |  | $ | 164 |  | $ | 242 |
Southern Company Gas |  |  |  |
Long-term debt | $ | (445) |  | $ | (422) |  | $ | 52 |  | $ | 75 |

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- Definition Tabular disclosure for cash flow hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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