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v3.22.1

Revenue Customer Type (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 USD ($) Units | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) Units | Mar. 31, 2021 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Revenue, Major Customer [Line Items] |  |  |  |  |  |
MLGW's % of operating revenues |  |  | 800.00% |  |  |
NES's % of operating revenues |  |  | 800.00% |  |  |
Sales of Electricity | $ 2,848 | $ 2,533 | $ 5,386 | $ 4,803 |  |
Electric revenue | 2,844 | 2,531 | 5,381 | 4,799 |  |
Off System Sales of Electricity | 4 |  | 5 | 4 |  |
Other revenue | 36 | 39 | 81 | 73 |  |
Revenues | 2,884 | 2,572 | 5,467 | 4,876 |  |
Bill credits for LTA | $ (50) | (48) | $ (93) | (90) |  |
Number of LPCs signed LTA | Units | 146 |  | 146 |  |  |
Number of LPCs signed Flexibility Agreement | Units | 77 |  | 77 |  |  |
Percent of sales of electricity to LPCs | 92.00% |  | 91.00% |  |  |
Pandemic Relief Credit | $ (55) |  | $ (105) | (104) |  |
Forecast |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Pandemic Relief Credit |  |  |  |  | $ 133 | $ 220
lpcs [Domain] |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Electric revenue | 2,608 | 2,337 | 4,914 | 4,428 |  |
industries directly served [Domain] |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Electric revenue | 206 | 168 | 411 | 322 |  |
federal agencies and other [Domain] |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Electric revenue | 34 | 28 | 61 | 53 |  |
ALABAMA |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Electric revenue | 413 | 379 | 784 | 713 |  |
GEORGIA |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Electric revenue | 74 | 66 | 138 | 124 |  |
KENTUCKY |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Electric revenue | 190 | 157 | 361 | 294 |  |
MISSISSIPPI |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Electric revenue | 264 | 237 | 505 | 449 |  |
NORTH CAROLINA |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Electric revenue | 23 | 18 | 43 | 34 |  |
TENNESSEE |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Electric revenue | 1,867 | 1,663 | 3,526 | 3,164 |  |
VIRGINIA |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Electric revenue | $ 13 | $ 11 | $ 24 | $ 21 |  |

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