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Revenues (Tables) | 9 Months Ended
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Sep. 30, 2024
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Three Months Ended September 30 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $378 |  | $374 |  | $202 |  | $209 |  | $176 |  | $165
Retail - commercial | 239 |  | 241 |  | 153 |  | 158 |  | 86 |  | 83
Retail - industrial | 270 |  | 280 |  | 142 |  | 153 |  | 128 |  | 127
Wholesale | 58 |  | 59 |  | 19 |  | 21 |  | 39 |  | 38
Bulk power and other | 54 |  | 41 |  | 7 |  | 10 |  | 47 |  | 31
Total Electric Utility | 999 |  | 995 |  | 523 |  | 551 |  | 476 |  | 444
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 24 |  | 23 |  | 13 |  | 14 |  | 11 |  | 9
Retail - commercial | 13 |  | 12 |  | 7 |  | 9 |  | 6 |  | 3
Retail - industrial | 1 |  | 2 |  | 1 |  | 2 |  | — |  | —
Transportation/other | 11 |  | 10 |  | 6 |  | 6 |  | 5 |  | 4
Total Gas Utility | 49 |  | 47 |  | 27 |  | 31 |  | 22 |  | 16
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 9 |  | 11 |  | 9 |  | 11 |  | — |  | —
Other utility | 3 |  | 2 |  | 2 |  | 1 |  | 1 |  | 1
Total Other Utility | 12 |  | 13 |  | 11 |  | 12 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 21 |  | 22 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 21 |  | 22 |  | — |  | — |  | — |  | —
Total revenues | $1,081 |  | $1,077 |  | $561 |  | $594 |  | $499 |  | $461
| Alliant Energy |  | IPL |  | WPL
Nine Months Ended September 30 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $966 |  | $943 |  | $502 |  | $503 |  | $464 |  | $440
Retail - commercial | 616 |  | 627 |  | 385 |  | 399 |  | 231 |  | 228
Retail - industrial | 730 |  | 740 |  | 372 |  | 389 |  | 358 |  | 351
Wholesale | 147 |  | 154 |  | 45 |  | 47 |  | 102 |  | 107
Bulk power and other | 120 |  | 98 |  | 14 |  | 32 |  | 106 |  | 66
Total Electric Utility | 2,579 |  | 2,562 |  | 1,318 |  | 1,370 |  | 1,261 |  | 1,192
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 189 |  | 233 |  | 103 |  | 131 |  | 86 |  | 102
Retail - commercial | 92 |  | 122 |  | 48 |  | 65 |  | 44 |  | 57
Retail - industrial | 8 |  | 12 |  | 5 |  | 8 |  | 3 |  | 4
Transportation/other | 33 |  | 33 |  | 19 |  | 20 |  | 14 |  | 13
Total Gas Utility | 322 |  | 400 |  | 175 |  | 224 |  | 147 |  | 176
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 29 |  | 32 |  | 29 |  | 32 |  | — |  | —
Other utility | 7 |  | 6 |  | 5 |  | 4 |  | 2 |  | 2
Total Other Utility | 36 |  | 38 |  | 34 |  | 36 |  | 2 |  | 2
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 68 |  | 66 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 68 |  | 66 |  | — |  | — |  | — |  | —
Total revenues | $3,005 |  | $3,066 |  | $1,527 |  | $1,630 |  | $1,410 |  | $1,370
IPL [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Three Months Ended September 30 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $378 |  | $374 |  | $202 |  | $209 |  | $176 |  | $165
Retail - commercial | 239 |  | 241 |  | 153 |  | 158 |  | 86 |  | 83
Retail - industrial | 270 |  | 280 |  | 142 |  | 153 |  | 128 |  | 127
Wholesale | 58 |  | 59 |  | 19 |  | 21 |  | 39 |  | 38
Bulk power and other | 54 |  | 41 |  | 7 |  | 10 |  | 47 |  | 31
Total Electric Utility | 999 |  | 995 |  | 523 |  | 551 |  | 476 |  | 444
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 24 |  | 23 |  | 13 |  | 14 |  | 11 |  | 9
Retail - commercial | 13 |  | 12 |  | 7 |  | 9 |  | 6 |  | 3
Retail - industrial | 1 |  | 2 |  | 1 |  | 2 |  | — |  | —
Transportation/other | 11 |  | 10 |  | 6 |  | 6 |  | 5 |  | 4
Total Gas Utility | 49 |  | 47 |  | 27 |  | 31 |  | 22 |  | 16
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 9 |  | 11 |  | 9 |  | 11 |  | — |  | —
Other utility | 3 |  | 2 |  | 2 |  | 1 |  | 1 |  | 1
Total Other Utility | 12 |  | 13 |  | 11 |  | 12 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 21 |  | 22 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 21 |  | 22 |  | — |  | — |  | — |  | —
Total revenues | $1,081 |  | $1,077 |  | $561 |  | $594 |  | $499 |  | $461
| Alliant Energy |  | IPL |  | WPL
Nine Months Ended September 30 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $966 |  | $943 |  | $502 |  | $503 |  | $464 |  | $440
Retail - commercial | 616 |  | 627 |  | 385 |  | 399 |  | 231 |  | 228
Retail - industrial | 730 |  | 740 |  | 372 |  | 389 |  | 358 |  | 351
Wholesale | 147 |  | 154 |  | 45 |  | 47 |  | 102 |  | 107
Bulk power and other | 120 |  | 98 |  | 14 |  | 32 |  | 106 |  | 66
Total Electric Utility | 2,579 |  | 2,562 |  | 1,318 |  | 1,370 |  | 1,261 |  | 1,192
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 189 |  | 233 |  | 103 |  | 131 |  | 86 |  | 102
Retail - commercial | 92 |  | 122 |  | 48 |  | 65 |  | 44 |  | 57
Retail - industrial | 8 |  | 12 |  | 5 |  | 8 |  | 3 |  | 4
Transportation/other | 33 |  | 33 |  | 19 |  | 20 |  | 14 |  | 13
Total Gas Utility | 322 |  | 400 |  | 175 |  | 224 |  | 147 |  | 176
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 29 |  | 32 |  | 29 |  | 32 |  | — |  | —
Other utility | 7 |  | 6 |  | 5 |  | 4 |  | 2 |  | 2
Total Other Utility | 36 |  | 38 |  | 34 |  | 36 |  | 2 |  | 2
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 68 |  | 66 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 68 |  | 66 |  | — |  | — |  | — |  | —
Total revenues | $3,005 |  | $3,066 |  | $1,527 |  | $1,630 |  | $1,410 |  | $1,370
WPL [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Three Months Ended September 30 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $378 |  | $374 |  | $202 |  | $209 |  | $176 |  | $165
Retail - commercial | 239 |  | 241 |  | 153 |  | 158 |  | 86 |  | 83
Retail - industrial | 270 |  | 280 |  | 142 |  | 153 |  | 128 |  | 127
Wholesale | 58 |  | 59 |  | 19 |  | 21 |  | 39 |  | 38
Bulk power and other | 54 |  | 41 |  | 7 |  | 10 |  | 47 |  | 31
Total Electric Utility | 999 |  | 995 |  | 523 |  | 551 |  | 476 |  | 444
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 24 |  | 23 |  | 13 |  | 14 |  | 11 |  | 9
Retail - commercial | 13 |  | 12 |  | 7 |  | 9 |  | 6 |  | 3
Retail - industrial | 1 |  | 2 |  | 1 |  | 2 |  | — |  | —
Transportation/other | 11 |  | 10 |  | 6 |  | 6 |  | 5 |  | 4
Total Gas Utility | 49 |  | 47 |  | 27 |  | 31 |  | 22 |  | 16
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 9 |  | 11 |  | 9 |  | 11 |  | — |  | —
Other utility | 3 |  | 2 |  | 2 |  | 1 |  | 1 |  | 1
Total Other Utility | 12 |  | 13 |  | 11 |  | 12 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 21 |  | 22 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 21 |  | 22 |  | — |  | — |  | — |  | —
Total revenues | $1,081 |  | $1,077 |  | $561 |  | $594 |  | $499 |  | $461
| Alliant Energy |  | IPL |  | WPL
Nine Months Ended September 30 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $966 |  | $943 |  | $502 |  | $503 |  | $464 |  | $440
Retail - commercial | 616 |  | 627 |  | 385 |  | 399 |  | 231 |  | 228
Retail - industrial | 730 |  | 740 |  | 372 |  | 389 |  | 358 |  | 351
Wholesale | 147 |  | 154 |  | 45 |  | 47 |  | 102 |  | 107
Bulk power and other | 120 |  | 98 |  | 14 |  | 32 |  | 106 |  | 66
Total Electric Utility | 2,579 |  | 2,562 |  | 1,318 |  | 1,370 |  | 1,261 |  | 1,192
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 189 |  | 233 |  | 103 |  | 131 |  | 86 |  | 102
Retail - commercial | 92 |  | 122 |  | 48 |  | 65 |  | 44 |  | 57
Retail - industrial | 8 |  | 12 |  | 5 |  | 8 |  | 3 |  | 4
Transportation/other | 33 |  | 33 |  | 19 |  | 20 |  | 14 |  | 13
Total Gas Utility | 322 |  | 400 |  | 175 |  | 224 |  | 147 |  | 176
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 29 |  | 32 |  | 29 |  | 32 |  | — |  | —
Other utility | 7 |  | 6 |  | 5 |  | 4 |  | 2 |  | 2
Total Other Utility | 36 |  | 38 |  | 34 |  | 36 |  | 2 |  | 2
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 68 |  | 66 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 68 |  | 66 |  | — |  | — |  | — |  | —
Total revenues | $3,005 |  | $3,066 |  | $1,527 |  | $1,630 |  | $1,410 |  | $1,370

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