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Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Utility: |  |
Electric plant in service | $ 9,106.2 | $ 9,070.7
Gas plant in service | 884.8 | 878.4
Other plant in service | 509.7 | 506.2
Accumulated depreciation | (3,573.4) | (3,513.0)
Net plant | 6,927.3 | 6,942.3
Construction work in progress: |  |
Columbia Energy Center Units 1 and 2 emission controls (WPL) | 171.2 | 130.4
Ottumwa Generating Station Unit 1 emission controls (IPL) | 93.7 | 73.7
George Neal Generating Station Units 3 and 4 emission controls (IPL) | 82.4 | 66.9
Other | 166.0 | 147.8
Other, less accumulated depreciation | 21.1 | 21.2
Total utility | 7,461.7 | 7,382.3
Non-regulated and other: |  |
Non-regulated Generation, less accumulated depreciation | 255.8 | 258.6
Alliant Energy Corporate Services, Inc. and other, less accumulated depreciation | 196.1 | 197.1
Total non-regulated and other | 451.9 | 455.7
Total property, plant and equipment | 7,913.6 | 7,838.0
Current assets: |  |
Cash and cash equivalents | 53.4 | 21.2
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 98.9 | 94.9
Unbilled utility revenues | 73.8 | 81.4
Other | 220.6 | 209.4
Production fuel, at weighted average cost | 99.8 | 103.1
Materials and supplies, at weighted average cost | 64.9 | 63.1
Gas stored underground, at weighted average cost | 9.0 | 37.7
Deferred income tax assets | 92.5 | 170.2
Other | 157.5 | 213.3
Total current assets | 870.4 | 994.3
Investments: |  |
Investment in American Transmission Company LLC | 259.8 | 257.0
Other | 61.8 | 62.0
Total investments | 321.6 | 319.0
Other assets: |  |
Regulatory assets | 1,519.4 | 1,528.9
Deferred charges and other | 108.9 | 105.3
Total other assets | 1,628.3 | 1,634.2
Total assets | 10,733.9 | 10,785.5
Stockholders' Equity Attributable to Parent [Abstract] |  |
Common stock | 1.1 | 1.1
Additional paid-in capital | 1,504.4 | 1,511.2
Retained earnings | 1,648.4 | 1,630.7
Accumulated other comprehensive loss | (0.8) | (0.8)
Shares in deferred compensation trust - 212,456 and 216,030 shares at a weighted average cost of $34.07 and $33.61 per share | (7.2) | (7.3)
Total common equity | 3,145.9 | 3,134.9
Cumulative preferred stock (Interstate Power and Light Company) | 200.0 | 145.1
Noncontrolling interest | 1.8 | 1.8
Total equity | 3,347.7 | 3,281.8
Cumulative preferred stock (Wisconsin Power and Light Company) | 0 | 60.0
Long-term debt, net (excluding current portion) | 3,121.9 | 3,136.6
Total capitalization | 6,469.6 | 6,478.4
Current liabilities: |  |
Current maturities of long-term debt | 1.5 | 1.5
Commercial paper | 243.4 | 217.5
Accounts payable | 368.6 | 339.3
Regulatory liabilities | 228.5 | 189.7
Other | 196.1 | 272.0
Total current liabilities | 1,038.1 | 1,020.0
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 1,901.4 | 1,934.2
Regulatory liabilities | 707.2 | 726.4
Pension and other benefit obligations | 360.3 | 364.0
Other | 257.3 | 262.5
Total long-term liabilities and deferred credits | 3,226.2 | 3,287.1
Commitments and contingencies (Note 12) |  |
Total capitalization and liabilities | 10,733.9 | 10,785.5
IPL [Member] |  |
Utility: |  |
Electric plant in service | 4,836.0 | 4,815.2
Gas plant in service | 444.3 | 441.4
Other plant in service | 292.1 | 289.1
Accumulated depreciation | (1,959.5) | (1,930.7)
Net plant | 3,612.9 | 3,615.0
Construction work in progress: |  |
Ottumwa Generating Station Unit 1 emission controls (IPL) | 93.7 | 73.7
George Neal Generating Station Units 3 and 4 emission controls (IPL) | 82.4 | 66.9
Other | 94.7 | 82.8
Other, less accumulated depreciation | 19.7 | 19.8
Non-regulated and other: |  |
Total property, plant and equipment | 3,903.4 | 3,858.2
Current assets: |  |
Cash and cash equivalents | 4.7 | 4.5
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 165.1 | 95.0
Income tax refunds receivable | 23.6 | 14.9
Production fuel, at weighted average cost | 74.4 | 75.2
Materials and supplies, at weighted average cost | 34.6 | 33.3
Gas stored underground, at weighted average cost | 2.2 | 17.2
Deferred income tax assets | 58.7 | 79.3
Other | 54.3 | 72.2
Total current assets | 417.6 | 391.6
Investments: |  |
Total investments | 17.6 | 17.6
Other assets: |  |
Regulatory assets | 1,171.5 | 1,170.3
Deferred charges and other | 20.8 | 19.3
Total other assets | 1,192.3 | 1,189.6
Total assets | 5,530.9 | 5,457.0
Stockholders' Equity Attributable to Parent [Abstract] |  |
Common stock | 33.4 | 33.4
Additional paid-in capital | 1,062.8 | 1,037.8
Retained earnings | 439.3 | 448.0
Total common equity | 1,535.5 | 1,519.2
Cumulative preferred stock (Interstate Power and Light Company) | 200.0 | 145.1
Total equity | 1,735.5 | 1,664.3
Long-term debt, net (excluding current portion) | 1,344.5 | 1,359.5
Total capitalization | 3,080.0 | 3,023.8
Current liabilities: |  |
Commercial paper | 0 | 26.3
Accounts payable | 204.2 | 163.2
Accounts payable to associated companies | 37.4 | 29.3
Regulatory liabilities | 164.9 | 130.1
Other | 114.2 | 119.9
Total current liabilities | 520.7 | 468.8
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 1,079.6 | 1,087.3
Regulatory liabilities | 550.3 | 571.3
Pension and other benefit obligations | 122.1 | 122.9
Other | 178.2 | 182.9
Total long-term liabilities and deferred credits | 1,930.2 | 1,964.4
Commitments and contingencies (Note 12) |  |
Total capitalization and liabilities | 5,530.9 | 5,457.0
WPL [Member] |  |
Utility: |  |
Electric plant in service | 4,270.2 | 4,255.5
Gas plant in service | 440.5 | 437.0
Other plant in service | 217.6 | 217.1
Accumulated depreciation | (1,613.9) | (1,582.3)
Net plant | 3,314.4 | 3,327.3
Leased Sheboygan Falls Energy Facility, less accumulated amortization | 75.5 | 77.0
Construction work in progress: |  |
Columbia Energy Center Units 1 and 2 emission controls (WPL) | 171.2 | 130.4
Other | 71.3 | 65.0
Other, less accumulated depreciation | 1.4 | 1.4
Non-regulated and other: |  |
Total property, plant and equipment | 3,633.8 | 3,601.1
Current assets: |  |
Cash and cash equivalents | 8.4 | 0.7
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 89.6 | 83.3
Unbilled utility revenues | 73.8 | 81.4
Other | 52.1 | 48.5
Production fuel, at weighted average cost | 25.4 | 27.9
Materials and supplies, at weighted average cost | 29.0 | 28.5
Gas stored underground, at weighted average cost | 6.8 | 20.5
Regulatory assets | 26.7 | 35.9
Deferred income tax assets | 22.6 | 85.6
Other | 63.7 | 56.4
Total current assets | 398.1 | 468.7
Investments: |  |
Investment in American Transmission Company LLC | 259.8 | 257.0
Other | 19.2 | 19.6
Total investments | 279.0 | 276.6
Other assets: |  |
Regulatory assets | 347.9 | 358.6
Deferred charges and other | 58.7 | 57.6
Total other assets | 406.6 | 416.2
Total assets | 4,717.5 | 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 | 570.5 | 557.6
Total common equity | 1,595.8 | 1,583.0
Cumulative preferred stock (Wisconsin Power and Light Company) | 0 | 60.0
Long-term debt, net (excluding current portion) | 1,331.7 | 1,331.5
Total capitalization | 2,927.5 | 2,974.5
Current liabilities: |  |
Commercial paper | 160.0 | 86.6
Accounts payable | 115.8 | 126.4
Accounts payable to associated companies | 16.3 | 13.2
Accrued taxes | 4.0 | 28.3
Other | 126.7 | 131.0
Total current liabilities | 422.8 | 385.5
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 811.2 | 844.1
Regulatory liabilities | 156.9 | 155.1
Capital lease obligations - Sheboygan Falls Energy Facility | 98.0 | 99.1
Pension and other benefit obligations | 159.5 | 159.7
Other | 141.6 | 144.6
Total long-term liabilities and deferred credits | 1,367.2 | 1,402.6
Commitments and contingencies (Note 12) |  |
Total capitalization and liabilities | $ 4,717.5 | $ 4,762.6

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