| Utility: | |
| Electric plant in service | |
| Gas plant in service | |
| Other plant in service | |
| Accumulated depreciation | |
| Net plant | |
| Construction work in progress: | |
| Columbia Energy Center Units 1 and 2 emission controls (WPL) | |
| Ottumwa Generating Station Unit 1 emission controls (IPL) | |
| George Neal Generating Station Units 3 and 4 emission controls (IPL) | |
| Other | |
| Other, less accumulated depreciation | |
| Total utility | |
| Non-regulated and other: | |
| Non-regulated Generation, less accumulated depreciation | |
| Alliant Energy Corporate Services, Inc. and other, less accumulated depreciation | |
| Total non-regulated and other | |
| Total property, plant and equipment | 9.92B |
| Current assets: | |
| Cash and cash equivalents | 84.7M |
| Accounts receivable, less allowance for doubtful accounts: | |
| Customer | 491.5M |
| Unbilled utility revenues | |
| Other | |
| Production fuel, at weighted average cost | 92.6M |
| Materials and supplies, at weighted average cost | 89.5M |
| Gas stored underground, at weighted average cost | 37.8M |
| Regulatory assets | 63.1M |
| Deferred income tax assets | |
| Other | 98.9M |
| Total current assets | 958.1M |
| Investments: | |
| Investment in American Transmission Company LLC | 309.9M |
| Other | |
| Total investments | 329.6M |
| Other assets: | |
| Regulatory assets | 1.81B |
| Deferred charges and other | 9.4M |
| Total other assets | |
| Total assets | 13.03B |
| Stockholders' Equity Attributable to Parent [Abstract] | |
| Common stock | 2.3M |
| Additional paid-in capital | 1.69B |
| Retained earnings | 2.18B |
| Accumulated other comprehensive loss | -400K |
| Shares in deferred compensation trust - 217,404 and 216,030 shares at a weighted average cost of $34.48 and $33.61 per share | -9.8M |
| Total common equity | 3.86B |
| Cumulative preferred stock (Interstate Power and Light Company) | |
| Noncontrolling interest | |
| Total equity | 4.06B |
| Cumulative preferred stock (Wisconsin Power and Light Company) | |
| Long-term debt, net (excluding current portion) | 3.82B |
| Total capitalization | |
| Current liabilities: | |
| Current maturities of long-term debt | 314M |
| Commercial paper | 238.3M |
| Accounts payable | 365.1M |
| Regulatory liabilities | 178.4M |
| Other | 273.9M |
| Total current liabilities | 1.37B |
| Other long-term liabilities and deferred credits: | |
| Deferred income tax liabilities | 2.53B |
| Regulatory liabilities | 497.4M |
| Pension and other benefit obligations | 455.3M |
| Other | 300.2M |
| Total long-term liabilities and deferred credits | |
| Commitments and contingencies (Note 12) | 0 |
| Total capitalization and liabilities | 13.03B |
| Utility: | |
| Electric plant in service | |
| Gas plant in service | |
| Other plant in service | |
| Accumulated depreciation | |
| Net plant | |
| Construction work in progress: | |
| Ottumwa Generating Station Unit 1 emission controls (IPL) | |
| George Neal Generating Station Units 3 and 4 emission controls (IPL) | |
| Other | |
| Other, less accumulated depreciation | |
| Non-regulated and other: | |
| Total property, plant and equipment | 5.22B |
| Current assets: | |
| Cash and cash equivalents | 77.7M |
| Accounts receivable, less allowance for doubtful accounts: | |
| Customer | 266.8M |
| Income tax refunds receivable | |
| Production fuel, at weighted average cost | 70M |
| Materials and supplies, at weighted average cost | 50M |
| Gas stored underground, at weighted average cost | 17.4M |
| Regulatory assets | 15M |
| Deferred income tax assets | |
| Other | 37.2M |
| Total current assets | 534.1M |
| Investments: | |
| Total investments | 800K |
| Other assets: | |
| Regulatory assets | 1.4B |
| Deferred charges and other | 3.8M |
| Total other assets | |
| Total assets | 7.16B |
| Stockholders' Equity Attributable to Parent [Abstract] | |
| Common stock | 33.4M |
| Additional paid-in capital | 1.47B |
| Retained earnings | 631.7M |
| Total common equity | 2.14B |
| Cumulative preferred stock (Interstate Power and Light Company) | |
| Total equity | 2.34B |
| Long-term debt, net (excluding current portion) | 2.15B |
| Total capitalization | |
| Current liabilities: | |
| Commercial paper | 0 |
| Accounts payable | 172.6M |
| Accounts payable to associated companies | |
| Regulatory liabilities | 132.5M |
| Other | 85.9M |
| Total current liabilities | 487.2M |
| Other long-term liabilities and deferred credits: | |
| Deferred income tax liabilities | 1.49B |
| Regulatory liabilities | 298.9M |
| Pension and other benefit obligations | 161.2M |
| Other | 229.1M |
| Total long-term liabilities and deferred credits | |
| Commitments and contingencies (Note 12) | 0 |
| Total capitalization and liabilities | 7.16B |
| Utility: | |
| Electric plant in service | |
| Gas plant in service | |
| Other plant in service | |
| Accumulated depreciation | |
| Net plant | |
| Leased Sheboygan Falls Energy Facility, less accumulated amortization | |
| Construction work in progress: | |
| Columbia Energy Center Units 1 and 2 emission controls (WPL) | |
| Other | |
| Other, less accumulated depreciation | |
| Non-regulated and other: | |
| Total property, plant and equipment | 4.29B |
| Current assets: | |
| Cash and cash equivalents | 5.6M |
| Accounts receivable, less allowance for doubtful accounts: | |
| Customer | 190.7M |
| Unbilled utility revenues | |
| Other | |
| Production fuel, at weighted average cost | 22.6M |
| Materials and supplies, at weighted average cost | 35.7M |
| Gas stored underground, at weighted average cost | 20.4M |
| Regulatory assets | 48.1M |
| Deferred income tax assets | |
| Other | 53.9M |
| Total current assets | 377M |
| Investments: | |
| Investment in American Transmission Company LLC | 309.9M |
| Other | |
| Total investments | 323.3M |
| Other assets: | |
| Regulatory assets | 409.5M |
| Deferred charges and other | 6.9M |
| Total other assets | |
| Total assets | 5.41B |
| Stockholders' Equity Attributable to Parent [Abstract] | |
| Common stock | 66.2M |
| Additional paid-in capital | 959M |
| Retained earnings | 788.6M |
| Total common equity | 1.81B |
| Cumulative preferred stock (Wisconsin Power and Light Company) | |
| Long-term debt, net (excluding current portion) | 1.53B |
| Total capitalization | |
| Current liabilities: | |
| Commercial paper | 11.8M |
| Accounts payable | 122.3M |
| Accounts payable to associated companies | |
| Regulatory liabilities | 45.9M |
| Accrued taxes | 41.2M |
| Other | 91M |
| Total current liabilities | 303.8M |
| Other long-term liabilities and deferred credits: | |
| Deferred income tax liabilities | 1.11B |
| Regulatory liabilities | 198.5M |
| Capital lease obligations - Sheboygan Falls Energy Facility | 78.9M |
| Pension and other benefit obligations | 186.2M |
| Other | 162.4M |
| Total long-term liabilities and deferred credits | |
| Commitments and contingencies (Note 12) | 0 |
| Total capitalization and liabilities | 5.41B |