| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 81a | 62a |
| Accounts receivable, less allowance for expected credit losses | 427a | 475a |
| Production fuel, at weighted average cost | 54a | 62a |
| Gas stored underground, at weighted average cost | 55a | 79a |
| Materials and supplies, at weighted average cost | 186a | 202a |
| Regulatory assets | 210a | 232a |
| Other | 171a | 160a |
| Total current assets | 1,184a | 1,272a |
| Property, plant and equipment, net | 18,701a | 17,157a |
| Investments | — | — |
| ATC holdings | 415a | 386a |
| Other | 224a | 216a |
| Total investments | 639a | 602a |
| Other assets | — | — |
| Regulatory assets | 2,064a | 2,029a |
| Deferred charges and other | 126a | 177a |
| Total other assets | 2,190a | 2,206a |
| Total assets | 22,714a | 21,237a |
| Liabilities and equity | — | — |
| Current liabilities | — | — |
| Current maturities of long-term debt | 1,171a | 809a |
| Commercial paper | 558a | 475a |
| Accounts payable | 532a | 611a |
| Regulatory liabilities | 69a | 107a |
| Other | 385a | 302a |
| Total current liabilities | 2,715a | 2,304a |
| Long-term debt, net (excluding current portion) | 8,677a | 8,225a |
| Other liabilities | — | — |
| Deferred tax liabilities | 2,188a | 2,042a |
| Regulatory liabilities | 959a | 1,023a |
| Pension and other benefit obligations | 224a | 249a |
| Other | 947a | 617a |
| Total other liabilities | 4,318a | 3,931a |
| Equity | — | — |
| Alliant energy corporation common equity | — | — |
| Common stock - $0.01 par value - 480,000,000 shares authorized; 256,690,222 and 256,096,848 shares outstanding | 3a | 3a |
| Additional paid-in capital | 3,060a | 3,030a |
| Retained earnings | 3,954a | 3,756a |
| Accumulated other comprehensive income | 1a | 1a |
| Shares in deferred compensation trust - 372,116 and 379,006 shares at a weighted average cost of $36.56 and $34.48 per share | -14a | -13a |
| Total alliant energy corporation common equity | 7,004a | 6,777a |
| Total liabilities and equity | 22,714a | 21,237a |