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Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Revenues: |  |
Electric utility | $ 791 | $ 768
Gas utility | 205 | 276
Other utility | 13 | 11
Non-utility | 22 | 22
Total revenues | 1,031 | 1,077
Operating expenses: |  |
Electric production fuel and purchased power | 163 | 157
Electric transmission service | 152 | 146
Cost of gas sold | 114 | 181
Other operation and maintenance | 160 | 174
Depreciation and amortization | 189 | 166
Taxes other than income taxes | 31 | 31
Total operating expenses | 809 | 855
Operating income | 222 | 222
Other (income) and deductions: |  |
Interest expense | 107 | 94
Equity income from unconsolidated investments, net | (15) | (17)
Allowance for funds used during construction | (19) | (19)
Other | 1 | 3
Total other (income) and deductions | 74 | 61
Income before income taxes | 148 | 161
Income tax expense (benefit) | (10) | (2)
Net income | 158 | 163
Net income attributable to common shareowners | $ 158 | $ 163
Weighted average number of common shares outstanding: |  |
Basic (in shares) | 256,200 | 251,200
Diluted (in shares) | 256,500 | 251,400
Earnings per weighted average common share attributable to Alliant Energy common shareowners: |  |
Basic (in dollars per share) | $ 0.62 | $ 0.65
Diluted (in dollars per share) | $ 0.62 | $ 0.65
IPL [Member] |  |
Revenues: |  |
Electric utility | $ 392 | $ 388
Gas utility | 108 | 150
Other utility | 13 | 11
Total revenues | 513 | 549
Operating expenses: |  |
Electric production fuel and purchased power | 67 | 47
Electric transmission service | 103 | 104
Cost of gas sold | 60 | 95
Other operation and maintenance | 86 | 95
Depreciation and amortization | 96 | 96
Taxes other than income taxes | 16 | 16
Total operating expenses | 428 | 453
Operating income | 85 | 96
Other (income) and deductions: |  |
Interest expense | 42 | 37
Allowance for funds used during construction | (10) | (3)
Other | 0 | 1
Total other (income) and deductions | 32 | 35
Income before income taxes | 53 | 61
Income tax expense (benefit) | (10) | (11)
Net income | 63 | 72
WPL [Member] |  |
Revenues: |  |
Electric utility | 399 | 380
Gas utility | 97 | 126
Total revenues | 496 | 506
Operating expenses: |  |
Electric production fuel and purchased power | 96 | 109
Electric transmission service | 49 | 42
Cost of gas sold | 53 | 86
Other operation and maintenance | 63 | 66
Depreciation and amortization | 90 | 68
Taxes other than income taxes | 14 | 14
Total operating expenses | 365 | 385
Operating income | 131 | 121
Other (income) and deductions: |  |
Interest expense | 41 | 36
Allowance for funds used during construction | (9) | (16)
Other | 1 | 1
Total other (income) and deductions | 33 | 21
Income before income taxes | 98 | 100
Income tax expense (benefit) | 6 | 12
Net income | $ 92 | $ 88

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