ALLIANT ENERGY CORP
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LNT Q4 2025 request
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| Metric | Q4 2025 | Q4 2024 | YoY |
|---|---|---|---|
| Regulated Operating Revenue Electric Non Nuclear | 869 | 793 | +9.6% |
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| IPL [Member] | 441 | 429 | +2.8% |
| WPL [Member] | 428 | 364 | +17.6% |
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| IPL [Member] | 441 | 429 | +2.8% |
| WPL [Member] | 428 | 364 | +17.6% |
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| Regulated Operation | 869 | 793 | +9.6% |
| Regulated Operating Revenue Gas | 159 | 143 | +11.2% |
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| IPL [Member] | 80 | 75 | +6.7% |
| WPL [Member] | 79 | 68 | +16.2% |
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| IPL [Member] | 80 | 75 | +6.7% |
| WPL [Member] | 79 | 68 | +16.2% |
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| Regulated Operation | 159 | 143 | +11.2% |
| Regulated Operating Revenue Other | 14 | 18 | -22.2% |
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| IPL [Member] | 11 | 15 | -26.7% |
| WPL [Member] | 3 | 3 | 0.0% |
| Unregulated Operating Revenue | 22 | 22 | 0.0% |
| Revenue | 1,064 | 976 | +9.0% |
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| All Other Segments | 22 | 22 | 0.0% |
| IPL [Member] | 532 | 519 | +2.5% |
| WPL [Member] | 510 | 435 | +17.2% |
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| IPL [Member] | 532 | 519 | +2.5% |
| WPL [Member] | 510 | 435 | +17.2% |
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| Regulated Operation | 1,042 | 954 | +9.2% |
| Utilities Operating Expense Fuel Used | 178 | 135 | +31.9% |
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| IPL [Member] | 70 | 74 | -5.4% |
| WPL [Member] | 108 | 61 | +77.0% |
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| IPL [Member] | 70 | 74 | -5.4% |
| WPL [Member] | 108 | 61 | +77.0% |
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| Regulated Operation | 178 | 135 | +31.9% |
| Cost of Revenue | 151 | 149 | +1.3% |
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| IPL [Member] | 100 | 100 | 0.0% |
| WPL [Member] | 51 | 48 | +6.2% |
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| IPL [Member] | 100 | 100 | 0.0% |
| WPL [Member] | 51 | 48 | +6.2% |
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| Regulated Operation | 151 | 148 | +2.0% |
| Utilities Operating Expense Gas And Petroleum Purchased | 83 | 72 | +15.3% |
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| IPL [Member] | 41 | 38 | +7.9% |
| WPL [Member] | 42 | 34 | +23.5% |
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| IPL [Member] | 41 | 38 | +7.9% |
| WPL [Member] | 42 | 34 | +23.5% |
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| Regulated Operation | 83 | 72 | +15.3% |
| Other Cost And Expense Operating | 210 | 166 | +26.5% |
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| All Other Segments | 28 | 10 | +180.0% |
| IPL [Member] | 98 | 77 | +27.3% |
| WPL [Member] | 84 | 79 | +6.3% |
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| Regulated Operation | 182 | 156 | +16.7% |
| Utilities Operating Expense Maintenance And Operations (Q) | — | — | — |
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| IPL [Member] | 98 | 77 | +27.3% |
| WPL [Member] | 84 | 79 | +6.3% |
| Depreciation & Amortization | 215 | 201 | +7.0% |
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| All Other Segments | 3 | 3 | 0.0% |
| IPL [Member] | 117 | 110 | +6.4% |
| WPL [Member] | 95 | 88 | +8.0% |
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| IPL [Member] | 117 | 110 | +6.4% |
| WPL [Member] | 95 | 88 | +8.0% |
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| Regulated Operation | 212 | 198 | +7.1% |
| Taxes Excluding Income And Excise Taxes | 30 | 32 | -6.2% |
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| IPL [Member] | 15 | 15 | 0.0% |
| WPL [Member] | 13 | 15 | -13.3% |
| Total Costs & Expenses | 867 | 755 | +14.8% |
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| IPL [Member] | 441 | 414 | +6.5% |
| WPL [Member] | 393 | 325 | +20.9% |
| Operating Income | 197 | 221 | -10.9% |
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| IPL [Member] | 91 | 105 | -13.3% |
| WPL [Member] | 117 | 110 | +6.4% |
| Interest Expense | 140 | 120 | +16.7% |
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| IPL [Member] | 57 | 49 | +16.3% |
| WPL [Member] | 44 | 41 | +7.3% |
| Income Loss From Equity Method Investments | -19 | -17 | -11.8% |
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| All Other Segments | -18 | -17 | -5.9% |
| WPL [Member] | -1 | 0 | — |
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| Income Loss From Equity Method Investments | -3 | -1 | -200.0% |
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| ATC Holdings [Member] | -16 | -19 | +15.8% |
| Corporate venture investments [Member] | 0 | 2 | -100.0% |
| Other [Member] | 0 | 1 | -100.0% |
| Total [Member] | -19 | -17 | -11.8% |
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| Regulated Operation | -1 | 0 | — |
| Public Utilities Allowance For Funds Used During Construction Additions | -24 | -17 | -41.2% |
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| IPL [Member] | -19 | -9 | -111.1% |
| WPL [Member] | -5 | -8 | +37.5% |
| Other Non-Operating Income (Expense) | -2 | -5 | +60.0% |
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| IPL [Member] | -1 | -8 | +87.5% |
| WPL [Member] | 3 | 4 | -25.0% |
| Non-Operating Income (Expense) | 95 | 81 | +17.3% |
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| IPL [Member] | 37 | 32 | +15.6% |
| WPL [Member] | 42 | 37 | +13.5% |
| Income Before Taxes | 102 | 140 | -27.1% |
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| IPL [Member] | 54 | 73 | -26.0% |
| WPL [Member] | 75 | 73 | +2.7% |
| Income Tax Expense (Benefit) | -40 | -10 | -300.0% |
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| All Other Segments | -6 | 9 | -166.7% |
| IPL [Member] | -29 | -17 | -70.6% |
| WPL [Member] | -5 | -2 | -150.0% |
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| IPL [Member] | -29 | -17 | -70.6% |
| WPL [Member] | -5 | -2 | -150.0% |
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| Regulated Operation | -34 | -19 | -78.9% |
| Net Income Loss Available To Common Stockholders Basic | 142 | 150 | -5.3% |
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| All Other Segments | -21 | -15 | -40.0% |
| IPL [Member] | 83 | 90 | -7.8% |
| WPL [Member] | 80 | 75 | +6.7% |
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| IPL [Member] | 83 | 90 | -7.8% |
| WPL [Member] | 80 | 75 | +6.7% |
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| Regulated Operation | 163 | 165 | -1.2% |
| Wtd Avg Shares (Basic) | 0.1 | 0.1 | 0.0% |
| Wtd Avg Shares (Diluted) | 0.3 | 0.1 | +200.0% |
| EPS (Basic) | 0.55 | 0.58 | -5.2% |
| EPS (Diluted) | 0.55 | 0.59 | -6.8% |
| Revenue | 1,064 | 976 | +9.0% |
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| All Other Segments | 22 | 22 | 0.0% |
| All Other Segments · Other Customer | 22 | 22 | 0.0% |
| Electric [Member] | 869 | 793 | +9.6% |
| Electric [Member] · IPL [Member] | 147 | 140 | +5.0% |
| Electric [Member] · IPL [Member] | 128 | 125 | +2.4% |
| Electric [Member] · IPL [Member] | 149 | 138 | +8.0% |
| Electric [Member] · IPL [Member] | 0 | 16 | -100.0% |
| Electric [Member] · IPL [Member] | 17 | 10 | +70.0% |
| Electric [Member] · IPL [Member] | 441 | 429 | +2.8% |
| Electric [Member] · Other Customer | 42 | 43 | -2.3% |
| Electric [Member] · Retail - Commercial [Member] | 227 | 205 | +10.7% |
| Electric [Member] · Retail - Industrial [Member] | 252 | 222 | +13.5% |
| Electric [Member] · Retail - Residential [Member] | 312 | 270 | +15.6% |
| Electric [Member] · Wholesale [Member] | 36 | 53 | -32.1% |
| Electric [Member] · WPL [Member] | 80 | 65 | +23.1% |
| Electric [Member] · WPL [Member] | 124 | 97 | +27.8% |
| Electric [Member] · WPL [Member] | 163 | 132 | +23.5% |
| Electric [Member] · WPL [Member] | 36 | 37 | -2.7% |
| Electric [Member] · WPL [Member] | 25 | 33 | -24.2% |
| Electric [Member] · WPL [Member] | 428 | 364 | +17.6% |
| Gas [Member] | 159 | 143 | +11.2% |
| Gas [Member] · IPL [Member] | 23 | 20 | +15.0% |
| Gas [Member] · IPL [Member] | 1 | 2 | -50.0% |
| Gas [Member] · IPL [Member] | 48 | 45 | +6.7% |
| Gas [Member] · IPL [Member] | 8 | 8 | 0.0% |
| Gas [Member] · IPL [Member] | 80 | 75 | +6.7% |
| Gas [Member] · Other Customer | 14 | 13 | +7.7% |
| Gas [Member] · Retail - Commercial [Member] | 47 | 41 | +14.6% |
| Gas [Member] · Retail - Industrial [Member] | 3 | 3 | 0.0% |
| Gas [Member] · Retail - Residential [Member] | 95 | 86 | +10.5% |
| Gas [Member] · WPL [Member] | 24 | 21 | +14.3% |
| Gas [Member] · WPL [Member] | 2 | 1 | +100.0% |
| Gas [Member] · WPL [Member] | 47 | 41 | +14.6% |
| Gas [Member] · WPL [Member] | 6 | 5 | +20.0% |
| Gas [Member] · WPL [Member] | 79 | 68 | +16.2% |
| Other Utility [Member] | 14 | 18 | -22.2% |
| Other Utility [Member] · IPL [Member] | 9 | 11 | -18.2% |
| Other Utility [Member] · IPL [Member] | 2 | 4 | -50.0% |
| Other Utility [Member] · IPL [Member] | 11 | 15 | -26.7% |
| Other Utility [Member] · Other Customer | 5 | 7 | -28.6% |
| Other Utility [Member] · Steam [Member] | 9 | 11 | -18.2% |
| Other Utility [Member] · WPL [Member] | 3 | 3 | 0.0% |
| Other Utility [Member] · WPL [Member] | 3 | 3 | 0.0% |
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| IPL [Member] | 532 | 519 | +2.5% |
| WPL [Member] | 510 | 435 | +17.2% |
| Interest Expense | 140 | 120 | +16.7% |
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| All Other Segments | 39 | 30 | +30.0% |
| IPL [Member] | 57 | 49 | +16.3% |
| WPL [Member] | 44 | 41 | +7.3% |
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| Regulated Operation | 101 | 90 | +12.2% |
Balance Sheet
| Metric | Q4 2025 | Q4 2024 | YoY |
|---|---|---|---|
| Current Assets | |||
| Cash & Cash Equivalents | 556 | 81 | +586.4% |
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| IPL [Member] | 7 | 29 | -75.9% |
| WPL [Member] | 37 | 51 | -27.5% |
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| Parent Company | 512 | — | — |
| Accounts Receivable | 476 | 427 | +11.5% |
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| IPL [Member] | 185 | 192 | -3.6% |
| WPL [Member] | 273 | 220 | +24.1% |
| Energy Related Inventory Other Fossil Fuel | 46 | 54 | -14.8% |
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| IPL [Member] | 18 | 30 | -40.0% |
| WPL [Member] | 28 | 24 | +16.7% |
| Energy Related Inventory Gas Stored Underground | 49 | 55 | -10.9% |
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| IPL [Member] | 24 | 25 | -4.0% |
| WPL [Member] | 25 | 30 | -16.7% |
| Inventory Raw Materials And Supplies | 193 | 186 | +3.8% |
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| IPL [Member] | 111 | 113 | -1.8% |
| WPL [Member] | 81 | 69 | +17.4% |
| Regulatory Assets Current | 155 | 210 | -26.2% |
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| IPL [Member] | 59 | 77 | -23.4% |
| WPL [Member] | 96 | 133 | -27.8% |
| Prepaid Taxes (Q) | — | — | — |
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| WPL [Member] | 52 | 51 | +2.0% |
| Other Assets Current | 222 | 171 | +29.8% |
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| IPL [Member] | 58 | 43 | +34.9% |
| WPL [Member] | 59 | 57 | +3.5% |
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| Parent Company | 6 | 2 | +200.0% |
| Total Current Assets | 1,697 | 1,184 | +43.3% |
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| IPL [Member] | 462 | 509 | -9.2% |
| WPL [Member] | 651 | 635 | +2.5% |
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| Parent Company | 644 | 117 | +450.4% |
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| Equity Method Investment Nonconsolidated Investee Or Group Of Investees | 254 | 223 | +13.9% |
| Non-Current Assets | |||
| Property, Plant & Equipment | 20,344 | 18,701 | +8.8% |
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| IPL [Member] | 10,436 | 9,336 | +11.8% |
| WPL [Member] | 9,363 | 8,861 | +5.7% |
| Long Term Investments | 694 | 639 | +8.6% |
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| Parent Company | 9,785 | 9,124 | +7.2% |
| Regulatory Assets Noncurrent | 2,119 | 2,064 | +2.7% |
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| IPL [Member] | 1,557 | 1,509 | +3.2% |
| WPL [Member] | 562 | 555 | +1.3% |
| Other Non-Current Assets | 2,256 | 2,190 | +3.0% |
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| IPL [Member] | 1,597 | 1,562 | +2.2% |
| WPL [Member] | 641 | 610 | +5.1% |
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| Parent Company | 102 | 84 | +21.4% |
| Total Assets | 24,991 | 22,714 | +10.0% |
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| All Other Segments | 1,841 | 1,201 | +53.3% |
| IPL [Member] | 12,495 | 11,407 | +9.5% |
| WPL [Member] | 10,655 | 10,106 | +5.4% |
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| IPL [Member] | 12,495 | 11,407 | +9.5% |
| WPL [Member] | 10,655 | 10,106 | +5.4% |
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| Parent Company | 10,531 | 9,325 | +12.9% |
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| Regulated Operation | 23,150 | 21,513 | +7.6% |
| Operating Lease Right-of-Use Assets | 21 | 22 | -4.5% |
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| IPL [Member] | 11 | 12 | -8.3% |
| WPL [Member] | 9 | 9 | 0.0% |
| Other Assets | |||
| Investments Business Line1 | 463 | 415 | +11.6% |
| Other Long Term Investments | 231 | 224 | +3.1% |
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| Parent Company | 1 | 1 | 0.0% |
| Deferred Costs | 137 | 126 | +8.7% |
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| Interest Rate Swap · Other Noncurrent Liabilities | 1 | — | — |
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| IPL [Member] | 40 | 53 | -24.5% |
| WPL [Member] | 79 | 55 | +43.6% |
| Current Liabilities | |||
| Current Portion of Long-Term Debt | 1,074 | 1,171 | -8.3% |
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| 3.875% senior notes, due 2026 [Member] · Convertible Debt | 574 | — | — |
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| Parent Company | 574 | 571 | +0.5% |
| Commercial Paper | 88 | 558 | -84.2% |
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| IPL [Member] | 88 | 50 | +76.0% |
| Accounts Payable | 498 | 532 | -6.4% |
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| IPL [Member] | 232 | 263 | -11.8% |
| WPL [Member] | 197 | 209 | -5.7% |
| Accounts Payable Other Current (Q) | — | — | — |
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| IPL [Member] | 45 | 47 | -4.3% |
| Taxes Payable Current (Q) | — | — | — |
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| IPL [Member] | 53 | 77 | -31.2% |
| Interest Payable Current | 124 | 112 | +10.7% |
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| IPL [Member] | 47 | 48 | -2.1% |
| WPL [Member] | 46 | 44 | +4.5% |
| Regulatory Liability Current | 88 | 69 | +27.5% |
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| IPL [Member] | 41 | 54 | -24.1% |
| WPL [Member] | 47 | 15 | +213.3% |
| Other Liabilities Current | 251 | 273 | -8.1% |
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| IPL [Member] | 80 | 89 | -10.1% |
| WPL [Member] | 105 | 94 | +11.7% |
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| Parent Company | 21 | 10 | +110.0% |
| Total Current Liabilities | 2,123 | 2,715 | -21.8% |
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| IPL [Member] | 586 | 928 | -36.9% |
| WPL [Member] | 395 | 545 | -27.5% |
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| Parent Company | 1,895 | 2,307 | -17.9% |
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| Equity Method Investment Nonconsolidated Investee Or Group Of Investees | 879 | 524 | +67.7% |
| Non-Current Liabilities | |||
| Long-Term Debt | 10,954 | 8,677 | +26.2% |
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| IPL [Member] | 4,680 | 3,790 | +23.5% |
| WPL [Member] | 3,669 | 3,370 | +8.9% |
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| Parent Company | 1,286 | — | — |
| Deferred Tax Liabilities | 2,310 | 2,188 | +5.6% |
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| IPL [Member] | 1,278 | 1,179 | +8.4% |
| WPL [Member] | 861 | 865 | -0.5% |
| Regulatory Liability Noncurrent | 1,113 | 959 | +16.1% |
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| IPL [Member] | 545 | 492 | +10.8% |
| WPL [Member] | 568 | 467 | +21.6% |
| Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent | 173 | 224 | -22.8% |
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| Other Postretirement Benefit Plans Defined Benefit | 80 | 78 | +2.6% |
| Other Postretirement Benefit Plans Defined Benefit · IPL [Member] | 12 | 12 | 0.0% |
| Other Postretirement Benefit Plans Defined Benefit · WPL [Member] | 40 | 41 | -2.4% |
| Pension Plans Defined Benefit | 72 | 123 | -41.5% |
| Pension Plans Defined Benefit · IPL [Member] | 17 | 31 | -45.2% |
| Pension Plans Defined Benefit · WPL [Member] | 35 | 62 | -43.5% |
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| IPL [Member] | 30 | 46 | -34.8% |
| WPL [Member] | 75 | 102 | -26.5% |
| Other Non-Current Liabilities | 984 | 947 | +3.9% |
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| IPL [Member] | 532 | 511 | +4.1% |
| WPL [Member] | 712 | 656 | +8.5% |
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| Parent Company | 4 | 3 | +33.3% |
| Long-Term Debt (Q) | — | — | — |
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| Three Point Two Five Percent Senior Notes Due Two Thousand Twenty Eight · Convertible Debt | 569 | — | — |
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| IPL [Member] · Carrying Reported Amount Fair Value Disclosure | 4,680 | 4,090 | +14.4% |
| WPL [Member] · Carrying Reported Amount Fair Value Disclosure | 3,669 | 3,370 | +8.9% |
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| Carrying Reported Amount Fair Value Disclosure | 12,028 | 9,848 | +22.1% |
| Operating Lease Liabilities | 19 | 20 | -5.0% |
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| IPL [Member] | 10 | 11 | -9.1% |
| WPL [Member] | 8 | 8 | 0.0% |
| Other Liabilities | |||
| Deferred Credits And Other Liabilities | 4,580 | 4,318 | +6.1% |
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| IPL [Member] | 2,385 | 2,228 | +7.0% |
| WPL [Member] | 2,216 | 2,090 | +6.0% |
| Stockholders' Equity | |||
| Common Stock Shares Issued | 257,137,261 | 256,690,222 | +0.2% |
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| IPL [Member] | 13,370,788 | 13,370,788 | 0.0% |
| WPL [Member] | 13,236,601 | 13,236,601 | 0.0% |
| Common Stock | 3 | 3 | 0.0% |
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| IPL [Member] | 33 | 33 | 0.0% |
| WPL [Member] | 66 | 66 | 0.0% |
| Additional Paid In Capital Common Stock | 3,101 | 3,060 | +1.3% |
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| IPL [Member] | 3,497 | 3,212 | +8.9% |
| WPL [Member] | 2,613 | 2,533 | +3.2% |
| Retained Earnings | 4,243 | 3,954 | +7.3% |
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| IPL [Member] | 1,314 | 1,216 | +8.1% |
| WPL [Member] | 1,696 | 1,502 | +12.9% |
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| Parent Company | 4,255 | 3,965 | +7.3% |
| Accumulated Other Comprehensive Income | 1 | 1 | 0.0% |
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| Interest Rate Swap · Aoci Including Portion Attributable To Noncontrolling Interest | 1 | — | — |
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| Parent Company | 1 | 1 | 0.0% |
| Common Stock Held In Trust | -14 | -14 | 0.0% |
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| Parent Company | -14 | -14 | 0.0% |
| Total Stockholders' Equity | 7,334 | 7,004 | +4.7% |
Show Equity Components breakouts |
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| Accumulated Other Comprehensive Income | 1 | 1 | 0.0% |
| Additional Paid In Capital | 3,101 | 3,060 | +1.3% |
| Additional Paid In Capital · IPL [Member] | 3,497 | 3,212 | +8.9% |
| Additional Paid In Capital · WPL [Member] | 2,613 | 2,533 | +3.2% |
| Common Stock | 3 | 3 | 0.0% |
| Common Stock · IPL [Member] | 33 | 33 | 0.0% |
| Common Stock · WPL [Member] | 66 | 66 | 0.0% |
| Deferred Compensation Share Based Payments | -14 | -14 | 0.0% |
| Retained Earnings | 4,243 | 3,954 | +7.3% |
| Retained Earnings · IPL [Member] | 1,314 | 1,216 | +8.1% |
| Retained Earnings · WPL [Member] | 1,696 | 1,502 | +12.9% |
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| IPL [Member] | 4,844 | 4,461 | +8.6% |
| WPL [Member] | 4,375 | 4,101 | +6.7% |
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| Parent Company | 7,346 | 7,015 | +4.7% |
| Total Liabilities & Equity | 24,991 | 22,714 | +10.0% |
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| IPL [Member] | 12,495 | 11,407 | +9.5% |
| WPL [Member] | 10,655 | 10,106 | +5.4% |
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| Parent Company | 10,531 | 9,325 | +12.9% |
Cash Flow Statement
| Metric | YTD Q4 2025 | YTD Q4 2024 | YoY |
|---|---|---|---|
| Operating Activities | |||
| Net Income | 142 | 150 | -5.3% |
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| IPL [Member] | 83 | 90 | -7.8% |
| WPL [Member] | 80 | 75 | +6.7% |
| Deferred Income Taxes And Tax Credits | -33 | -14 | -135.7% |
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| IPL [Member] | -15 | -27 | +44.4% |
| Other Non-Cash Items | 25 | -13 | +292.3% |
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| IPL [Member] | -9 | -11 | +18.2% |
| WPL [Member] | -61 | -49 | -24.5% |
| Change in Accounts Receivable | -261 | -159 | -64.2% |
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| IPL [Member] | -207 | -152 | -36.2% |
| Increase Decrease In Other Regulatory Assets (Q) | — | — | — |
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| IPL [Member] | 0 | 34 | -100.0% |
| WPL [Member] | 19 | 10 | +90.0% |
| Increase Decrease In Regulatory Liabilities | 33 | -36 | +191.7% |
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| IPL [Member] | 9 | 4 | +125.0% |
| WPL [Member] | 24 | -40 | +160.0% |
| Increase Decrease In Deferred Income Taxes | 151 | 37 | +308.1% |
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| IPL [Member] | 60 | 12 | +400.0% |
| WPL [Member] | 78 | 24 | +225.0% |
| Increase Decrease In Other Operating Capital Net | -23 | -21 | -9.5% |
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| IPL [Member] | -45 | 60 | -175.0% |
| Net Cash from Operations | 269 | 254 | +5.9% |
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| IPL [Member] | -3 | 126 | -102.4% |
| WPL [Member] | 263 | 110 | +139.1% |
| Investing Activities | |||
| Payments To Acquire Other Productive Assets | -45 | -43 | -4.7% |
| Proceeds From Collection Of Retained Interest In Securitized Receivables | 296 | 194 | +52.6% |
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| IPL [Member] | 296 | 194 | +52.6% |
| Other Investing Activities | -2 | 14 | -114.3% |
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| IPL [Member] | 2 | -24 | +108.3% |
| WPL [Member] | -4 | -10 | +60.0% |
| Net Cash from Investing | -291 | -607 | +52.1% |
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| IPL [Member] | -199 | -352 | +43.5% |
| WPL [Member] | -297 | -260 | -14.2% |
| Financing Activities | |||
| Payments Of Dividends Common Stock | -130 | -123 | -5.7% |
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| IPL [Member] | -89 | -49 | -81.6% |
| WPL [Member] | -44 | -49 | +10.2% |
| Proceeds From Issuance Of Common Stock | 5 | 5 | 0.0% |
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| Additional Paid In Capital | 5 | 5 | 0.0% |
| Proceeds From Contributions From Parent (Q) | — | — | — |
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| Additional Paid In Capital · IPL [Member] | 0 | 0 | — |
| Additional Paid In Capital · WPL [Member] | 0 | 0 | — |
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| IPL [Member] | 0 | 0 | — |
| WPL [Member] | 0 | 0 | — |
| Proceeds From Issuance Of Long Term Debt | 296 | 0 | — |
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| IPL [Member] | 0 | 0 | — |
| Repayments Of Long Term Debt | 0 | -504 | +100.0% |
| Proceeds From Repayments Of Short Term Debt | -104 | 228 | -145.6% |
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| WPL [Member] | -192 | 183 | -204.9% |
| Proceeds From Payments For Other Financing Activities (Q) | — | — | — |
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| IPL [Member] | 1 | -2 | +150.0% |
| WPL [Member] | 0 | -2 | +100.0% |
| Net Cash from Financing | 75 | -396 | +118.9% |
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| IPL [Member] | 0 | -501 | +100.0% |
| WPL [Member] | 60 | 132 | -54.5% |
| Supplemental | |||
| Interest Paid | -127 | -108 | -17.6% |
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| IPL [Member] | -59 | -47 | -25.5% |
| WPL [Member] | -40 | -40 | 0.0% |
| Income Taxes Paid | 158 | 39 | +305.1% |
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| IPL [Member] | 45 | 61 | -26.2% |
| WPL [Member] | 116 | -22 | +627.3% |
| Guarantee Obligations Liquidation Proceeds (Q) | — | — | — |
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| IPL [Member] · Indemnification Guarantee | 50 | 28 | +78.6% |
| WPL [Member] · Indemnification Guarantee | 118 | 16 | +637.5% |
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| Indemnification Guarantee · Renewable Tax Credits Transferred [Member] | 168 | 44 | +281.8% |
| Unpaid Capital Expenditures | -68 | 30 | -326.7% |
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| IPL [Member] | -54 | 8 | -775.0% |
| WPL [Member] | -18 | 19 | -194.7% |
| Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset | -105 | -49 | -114.3% |
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| IPL [Member] | -105 | -49 | -114.3% |
| Other Cash Flow | |||
| Net Change in Cash | 53 | -749 | +107.1% |
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| IPL [Member] | -202 | -727 | +72.2% |
| WPL [Member] | 26 | -18 | +244.4% |
| Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations | 556 | 81 | +586.4% |
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| IPL [Member] | 7 | 29 | -75.9% |
| WPL [Member] | 37 | 51 | -27.5% |
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| Parent Company | 512 | — | — |
Values in millions USD. Source: SEC EDGAR 10-K filing.