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v3.24.0.1

Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenues: |  |  |
Electric utility | $ 3,345 | $ 3,421 | $ 3,081
Gas utility | 540 | 642 | 456
Other utility | 52 | 49 | 49
Non-utility | 90 | 93 | 83
Total revenues | 4,027 | 4,205 | 3,669
Operating expenses: |  |  |
Electric production fuel and purchased power | 736 | 830 | 642
Electric transmission service | 583 | 573 | 537
Cost of gas sold | 299 | 389 | 258
Other operation and maintenance | 675 | 704 | 676
Depreciation and amortization | 676 | 671 | 657
Taxes other than income taxes | 115 | 110 | 104
Total operating expenses | 3,084 | 3,277 | 2,874
Operating income (loss) | 943 | 928 | 795
Other (income) and deductions: |  |  |
Interest expense | 394 | 325 | 277
Equity income from unconsolidated investments, net | (61) | (51) | (62)
Allowance for funds used during construction | (100) | (60) | (25)
Other | 3 | 6 | 5
Total other (income) and deductions | 236 | 220 | 195
Income before income taxes | 707 | 708 | 600
Income tax expense (benefit) | 4 | 22 | (74)
Net income | 703 | 686 | 674
Preferred dividend requirements of Interstate Power and Light Company | 0 | 0 | 15
Net income attributable to common shareowners | $ 703 | $ 686 | $ 659
Weighted average number of common shares outstanding: |  |  |
Basic (in shares) | 253.0 | 250.9 | 250.2
Diluted (in shares) | 253.3 | 251.2 | 250.7
Earnings per weighted average common share attributable to Alliant Energy common shareowners: |  |  |
Basic (in dollars per share) | $ 2.78 | $ 2.73 | $ 2.63
Diluted (in dollars per share) | $ 2.78 | $ 2.73 | $ 2.63
IPL [Member] |  |  |
Revenues: |  |  |
Electric utility | $ 1,761 | $ 1,859 | $ 1,752
Gas utility | 300 | 351 | 265
Other utility | 49 | 46 | 46
Total revenues | 2,110 | 2,256 | 2,063
Operating expenses: |  |  |
Electric production fuel and purchased power | 282 | 383 | 295
Electric transmission service | 420 | 407 | 367
Cost of gas sold | 166 | 206 | 149
Other operation and maintenance | 353 | 369 | 362
Depreciation and amortization | 388 | 381 | 375
Taxes other than income taxes | 57 | 57 | 55
Total operating expenses | 1,666 | 1,803 | 1,603
Operating income (loss) | 444 | 453 | 460
Other (income) and deductions: |  |  |
Interest expense | 155 | 148 | 139
Allowance for funds used during construction | (21) | (11) | (9)
Other | 2 | 6 | 1
Total other (income) and deductions | 136 | 143 | 131
Income before income taxes | 308 | 310 | 329
Income tax expense (benefit) | (58) | (50) | (36)
Net income | 366 | 360 | 365
Preferred dividend requirements of Interstate Power and Light Company | 0 | 0 | 15
Net income attributable to common shareowners | 366 | 360 | 350
WPL [Member] |  |  |
Revenues: |  |  |
Electric utility | 1,584 | 1,562 | 1,329
Gas utility | 240 | 291 | 191
Other utility | 3 | 3 | 3
Total revenues | 1,827 | 1,856 | 1,523
Operating expenses: |  |  |
Electric production fuel and purchased power | 455 | 447 | 347
Electric transmission service | 163 | 166 | 170
Cost of gas sold | 134 | 183 | 109
Other operation and maintenance | 271 | 278 | 268
Depreciation and amortization | 280 | 283 | 276
Taxes other than income taxes | 52 | 47 | 45
Total operating expenses | 1,355 | 1,404 | 1,215
Operating income (loss) | 472 | 452 | 308
Other (income) and deductions: |  |  |
Interest expense | 149 | 121 | 105
Allowance for funds used during construction | (79) | (49) | (16)
Other | (3) | (1) | 2
Total other (income) and deductions | 67 | 71 | 91
Income before income taxes | 405 | 381 | 217
Income tax expense (benefit) | 60 | 66 | (51)
Net income | $ 345 | $ 315 | $ 268

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