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Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Utility: |  |
Electric plant in service | $ 9,165.1 | $ 9,070.7
Gas plant in service | 892.4 | 878.4
Other plant in service | 516.0 | 506.2
Accumulated depreciation | (3,632.0) | (3,513.0)
Net plant | 6,941.5 | 6,942.3
Construction work in progress: |  |
Columbia Energy Center Units 1 and 2 emission controls (WPL) | 215.3 | 130.4
Ottumwa Generating Station Unit 1 emission controls (IPL) | 110.8 | 73.7
George Neal Generating Station Units 3 and 4 emission controls (IPL) | 95.0 | 66.9
Other | 189.3 | 147.8
Other, less accumulated depreciation | 21.0 | 21.2
Total utility | 7,572.9 | 7,382.3
Non-regulated and other: |  |
Non-regulated Generation, less accumulated depreciation | 253.5 | 258.6
Alliant Energy Corporate Services, Inc. and other, less accumulated depreciation | 200.8 | 197.1
Total non-regulated and other | 454.3 | 455.7
Total property, plant and equipment | 8,027.2 | 7,838.0
Current assets: |  |
Cash and cash equivalents | 11.5 | 21.2
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 85.0 | 94.9
Unbilled utility revenues | 69.3 | 81.4
Other | 190.1 | 209.4
Production fuel, at weighted average cost | 99.7 | 103.1
Materials and supplies, at weighted average cost | 68.3 | 63.1
Gas stored underground, at weighted average cost | 23.2 | 37.7
Regulatory assets | 78.3 | 83.5
Deferred income tax assets | 142.3 | 170.2
Other | 125.7 | 129.8
Total current assets | 893.4 | 994.3
Investments: |  |
Investment in American Transmission Company LLC | 264.4 | 257.0
Other | 56.9 | 62.0
Total investments | 321.3 | 319.0
Other assets: |  |
Regulatory assets | 1,533.8 | 1,528.9
Deferred charges and other | 111.9 | 105.3
Total other assets | 1,645.7 | 1,634.2
Total assets | 10,887.6 | 10,785.5
Stockholders' Equity Attributable to Parent [Abstract] |  |
Common stock | 1.1 | 1.1
Additional paid-in capital | 1,506.0 | 1,511.2
Retained earnings | 1,661.7 | 1,630.7
Accumulated other comprehensive loss | (0.8) | (0.8)
Shares in deferred compensation trust - 217,404 and 216,030 shares at a weighted average cost of $34.48 and $33.61 per share | (7.5) | (7.3)
Total common equity | 3,160.5 | 3,134.9
Cumulative preferred stock (Interstate Power and Light Company) | 200.0 | 145.1
Noncontrolling interest | 1.8 | 1.8
Total equity | 3,362.3 | 3,281.8
Cumulative preferred stock (Wisconsin Power and Light Company) | 0 | 60.0
Long-term debt, net (excluding current portion) | 3,141.4 | 3,136.6
Total capitalization | 6,503.7 | 6,478.4
Current liabilities: |  |
Current maturities of long-term debt | 1.5 | 1.5
Commercial paper | 223.1 | 217.5
Accounts payable | 391.1 | 339.3
Regulatory liabilities | 212.8 | 189.7
Other | 244.0 | 272.0
Total current liabilities | 1,072.5 | 1,020.0
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 1,991.1 | 1,934.2
Regulatory liabilities | 685.3 | 726.4
Pension and other benefit obligations | 359.2 | 364.0
Other | 275.8 | 262.5
Total long-term liabilities and deferred credits | 3,311.4 | 3,287.1
Commitments and contingencies (Note 12) |  |
Total capitalization and liabilities | 10,887.6 | 10,785.5
IPL [Member] |  |
Utility: |  |
Electric plant in service | 4,862.4 | 4,815.2
Gas plant in service | 447.3 | 441.4
Other plant in service | 294.2 | 289.1
Accumulated depreciation | (1,983.3) | (1,930.7)
Net plant | 3,620.6 | 3,615.0
Construction work in progress: |  |
Ottumwa Generating Station Unit 1 emission controls (IPL) | 110.8 | 73.7
George Neal Generating Station Units 3 and 4 emission controls (IPL) | 95.0 | 66.9
Other | 116.7 | 82.8
Other, less accumulated depreciation | 19.8 | 19.8
Non-regulated and other: |  |
Total property, plant and equipment | 3,962.9 | 3,858.2
Current assets: |  |
Cash and cash equivalents | 5.1 | 4.5
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 115.7 | 95.0
Income tax refunds receivable | 8.5 | 14.9
Production fuel, at weighted average cost | 71.1 | 75.2
Materials and supplies, at weighted average cost | 37.7 | 33.3
Gas stored underground, at weighted average cost | 10.2 | 17.2
Regulatory assets | 46.0 | 47.6
Deferred income tax assets | 86.2 | 79.3
Other | 50.5 | 24.6
Total current assets | 431.0 | 391.6
Investments: |  |
Total investments | 18.0 | 17.6
Other assets: |  |
Regulatory assets | 1,178.2 | 1,170.3
Deferred charges and other | 21.0 | 19.3
Total other assets | 1,199.2 | 1,189.6
Total assets | 5,611.1 | 5,457.0
Stockholders' Equity Attributable to Parent [Abstract] |  |
Common stock | 33.4 | 33.4
Additional paid-in capital | 1,092.9 | 1,037.8
Retained earnings | 429.6 | 448.0
Total common equity | 1,555.9 | 1,519.2
Cumulative preferred stock (Interstate Power and Light Company) | 200.0 | 145.1
Total equity | 1,755.9 | 1,664.3
Long-term debt, net (excluding current portion) | 1,364.7 | 1,359.5
Total capitalization | 3,120.6 | 3,023.8
Current liabilities: |  |
Commercial paper | 0 | 26.3
Accounts payable | 213.5 | 163.2
Accounts payable to associated companies | 30.4 | 29.3
Regulatory liabilities | 146.3 | 130.1
Other | 137.6 | 119.9
Total current liabilities | 527.8 | 468.8
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 1,131.6 | 1,087.3
Regulatory liabilities | 526.1 | 571.3
Pension and other benefit obligations | 121.1 | 122.9
Other | 183.9 | 182.9
Total long-term liabilities and deferred credits | 1,962.7 | 1,964.4
Commitments and contingencies (Note 12) |  |
Total capitalization and liabilities | 5,611.1 | 5,457.0
WPL [Member] |  |
Utility: |  |
Electric plant in service | 4,302.7 | 4,255.5
Gas plant in service | 445.1 | 437.0
Other plant in service | 221.8 | 217.1
Accumulated depreciation | (1,648.7) | (1,582.3)
Net plant | 3,320.9 | 3,327.3
Leased Sheboygan Falls Energy Facility, less accumulated amortization | 74.0 | 77.0
Construction work in progress: |  |
Columbia Energy Center Units 1 and 2 emission controls (WPL) | 215.3 | 130.4
Other | 72.6 | 65.0
Other, less accumulated depreciation | 1.2 | 1.4
Non-regulated and other: |  |
Total property, plant and equipment | 3,684.0 | 3,601.1
Current assets: |  |
Cash and cash equivalents | 2.5 | 0.7
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 74.9 | 83.3
Unbilled utility revenues | 69.3 | 81.4
Other | 45.8 | 48.5
Production fuel, at weighted average cost | 28.6 | 27.9
Materials and supplies, at weighted average cost | 29.0 | 28.5
Gas stored underground, at weighted average cost | 13.0 | 20.5
Regulatory assets | 32.3 | 35.9
Deferred income tax assets | 43.0 | 85.6
Other | 57.3 | 56.4
Total current assets | 395.7 | 468.7
Investments: |  |
Investment in American Transmission Company LLC | 264.4 | 257.0
Other | 19.6 | 19.6
Total investments | 284.0 | 276.6
Other assets: |  |
Regulatory assets | 355.6 | 358.6
Deferred charges and other | 63.0 | 57.6
Total other assets | 418.6 | 416.2
Total assets | 4,782.3 | 4,762.6
Stockholders' Equity Attributable to Parent [Abstract] |  |
Common stock | 66.2 | 66.2
Additional paid-in capital | 959.1 | 959.2
Retained earnings | 575.8 | 557.6
Total common equity | 1,601.1 | 1,583.0
Cumulative preferred stock (Wisconsin Power and Light Company) | 0 | 60.0
Long-term debt, net (excluding current portion) | 1,331.9 | 1,331.5
Total capitalization | 2,933.0 | 2,974.5
Current liabilities: |  |
Commercial paper | 148.9 | 86.6
Accounts payable | 124.0 | 126.4
Accounts payable to associated companies | 13.2 | 13.2
Regulatory liabilities | 66.5 | 59.6
Accrued taxes | 11.0 | 28.3
Other | 72.2 | 71.4
Total current liabilities | 435.8 | 385.5
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 843.8 | 844.1
Regulatory liabilities | 159.2 | 155.1
Capital lease obligations - Sheboygan Falls Energy Facility | 96.9 | 99.1
Pension and other benefit obligations | 158.0 | 159.7
Other | 155.6 | 144.6
Total long-term liabilities and deferred credits | 1,413.5 | 1,402.6
Commitments and contingencies (Note 12) |  |
Total capitalization and liabilities | $ 4,782.3 | $ 4,762.6

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