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Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Utility: |  |
Electric plant in service | $ 9,228.4 | $ 9,070.7
Gas plant in service | 901.4 | 878.4
Other plant in service | 521.6 | 506.2
Accumulated depreciation | (3,689.3) | (3,513.0)
Net plant | 6,962.1 | 6,942.3
Construction work in progress: |  |
Columbia Energy Center Units 1 and 2 emission controls (WPL) | 247.9 | 130.4
Ottumwa Generating Station Unit 1 emission controls (IPL) | 124.8 | 73.7
George Neal Generating Station Units 3 and 4 emission controls (IPL) | 106.6 | 66.9
Other | 222.9 | 147.8
Other, less accumulated depreciation | 21.0 | 21.2
Total utility | 7,685.3 | 7,382.3
Non-regulated and other: |  |
Non-regulated Generation, less accumulated depreciation | 251.4 | 258.6
Alliant Energy Corporate Services, Inc. and other, less accumulated depreciation | 204.7 | 197.1
Total non-regulated and other | 456.1 | 455.7
Total property, plant and equipment | 8,141.4 | 7,838.0
Current assets: |  |
Cash and cash equivalents | 17.7 | 21.2
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 78.1 | 94.9
Unbilled utility revenues | 64.7 | 81.4
Other | 188.6 | 209.4
Production fuel, at weighted average cost | 105.2 | 103.1
Materials and supplies, at weighted average cost | 71.1 | 63.1
Gas stored underground, at weighted average cost | 44.2 | 37.7
Regulatory assets | 60.3 | 83.5
Deferred income tax assets | 131.2 | 170.2
Other | 119.0 | 129.8
Total current assets | 880.1 | 994.3
Investments: |  |
Investment in American Transmission Company LLC | 268.3 | 257.0
Other | 56.4 | 62.0
Total investments | 324.7 | 319.0
Other assets: |  |
Regulatory assets | 1,535.9 | 1,528.9
Deferred charges and other | 99.1 | 105.3
Total other assets | 1,635.0 | 1,634.2
Total assets | 10,981.2 | 10,785.5
Common equity: |  |
Common stock | 1.1 | 1.1
Additional paid-in capital | 1,506.9 | 1,511.2
Retained earnings | 1,767.3 | 1,630.7
Accumulated other comprehensive loss | (0.8) | (0.8)
Shares in deferred compensation trust - 222,415 and 216,030 shares at a weighted average cost of $34.87 and $33.61 per share | (7.8) | (7.3)
Total common equity | 3,266.7 | 3,134.9
Cumulative preferred stock (Interstate Power and Light Company) | 200.0 | 145.1
Noncontrolling interest | 1.8 | 1.8
Total equity | 3,468.5 | 3,281.8
Cumulative preferred stock (Wisconsin Power and Light Company) | 0 | 60.0
Long-term debt, net (excluding current portion) | 3,104.8 | 3,136.6
Total capitalization | 6,573.3 | 6,478.4
Current liabilities: |  |
Current maturities of long-term debt | 48.4 | 1.5
Commercial paper | 237.3 | 217.5
Accounts payable | 368.7 | 339.3
Regulatory liabilities | 174.9 | 189.7
Other | 223.5 | 272.0
Total current liabilities | 1,052.8 | 1,020.0
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 2,063.9 | 1,934.2
Regulatory liabilities | 662.7 | 726.4
Pension and other benefit obligations | 356.6 | 364.0
Other | 271.9 | 262.5
Total long-term liabilities and deferred credits | 3,355.1 | 3,287.1
Commitments and contingencies (Note 12) |  |
Total capitalization and liabilities | 10,981.2 | 10,785.5
IPL [Member] |  |
Utility: |  |
Electric plant in service | 4,902.3 | 4,815.2
Gas plant in service | 451.8 | 441.4
Other plant in service | 299.0 | 289.1
Accumulated depreciation | (2,014.3) | (1,930.7)
Net plant | 3,638.8 | 3,615.0
Construction work in progress: |  |
Ottumwa Generating Station Unit 1 emission controls (IPL) | 124.8 | 73.7
George Neal Generating Station Units 3 and 4 emission controls (IPL) | 106.6 | 66.9
Other | 131.5 | 82.8
Other, less accumulated depreciation | 19.8 | 19.8
Non-regulated and other: |  |
Total property, plant and equipment | 4,021.5 | 3,858.2
Current assets: |  |
Cash and cash equivalents | 6.3 | 4.5
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 130.1 | 95.0
Income tax refunds receivable | 30.0 | 14.9
Production fuel, at weighted average cost | 70.6 | 75.2
Materials and supplies, at weighted average cost | 39.6 | 33.3
Gas stored underground, at weighted average cost | 25.3 | 17.2
Regulatory assets | 33.4 | 47.6
Deferred income tax assets | 75.7 | 79.3
Other | 38.9 | 24.6
Total current assets | 449.9 | 391.6
Investments: |  |
Total investments | 17.9 | 17.6
Other assets: |  |
Regulatory assets | 1,182.6 | 1,170.3
Deferred charges and other | 21.9 | 19.3
Total other assets | 1,204.5 | 1,189.6
Total assets | 5,693.8 | 5,457.0
Common equity: |  |
Common stock | 33.4 | 33.4
Additional paid-in capital | 1,122.9 | 1,037.8
Retained earnings | 507.4 | 448.0
Total common equity | 1,663.7 | 1,519.2
Cumulative preferred stock (Interstate Power and Light Company) | 200.0 | 145.1
Total equity | 1,863.7 | 1,664.3
Long-term debt, net (excluding current portion) | 1,336.4 | 1,359.5
Total capitalization | 3,200.1 | 3,023.8
Current liabilities: |  |
Current maturities of long-term debt | 38.4 | 0
Commercial paper | 0 | 26.3
Accounts payable | 195.1 | 163.2
Accounts payable to associated companies | 53.3 | 29.3
Regulatory liabilities | 116.6 | 130.1
Other | 113.9 | 119.9
Total current liabilities | 517.3 | 468.8
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 1,161.0 | 1,087.3
Regulatory liabilities | 513.8 | 571.3
Pension and other benefit obligations | 120.2 | 122.9
Other | 181.4 | 182.9
Total long-term liabilities and deferred credits | 1,976.4 | 1,964.4
Commitments and contingencies (Note 12) |  |
Total capitalization and liabilities | 5,693.8 | 5,457.0
WPL [Member] |  |
Utility: |  |
Electric plant in service | 4,326.1 | 4,255.5
Gas plant in service | 449.6 | 437.0
Other plant in service | 222.6 | 217.1
Accumulated depreciation | (1,675.0) | (1,582.3)
Net plant | 3,323.3 | 3,327.3
Leased Sheboygan Falls Energy Facility, less accumulated amortization | 72.4 | 77.0
Construction work in progress: |  |
Columbia Energy Center Units 1 and 2 emission controls (WPL) | 247.9 | 130.4
Other | 91.4 | 65.0
Other, less accumulated depreciation | 1.2 | 1.4
Non-regulated and other: |  |
Total property, plant and equipment | 3,736.2 | 3,601.1
Current assets: |  |
Cash and cash equivalents | 6.6 | 0.7
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 70.6 | 83.3
Unbilled utility revenues | 64.7 | 81.4
Other | 41.9 | 48.5
Production fuel, at weighted average cost | 34.6 | 27.9
Materials and supplies, at weighted average cost | 29.7 | 28.5
Gas stored underground, at weighted average cost | 18.9 | 20.5
Regulatory assets | 26.9 | 35.9
Deferred income tax assets | 44.9 | 85.6
Other | 49.5 | 56.4
Total current assets | 388.3 | 468.7
Investments: |  |
Investment in American Transmission Company LLC | 268.3 | 257.0
Other | 19.2 | 19.6
Total investments | 287.5 | 276.6
Other assets: |  |
Regulatory assets | 353.3 | 358.6
Deferred charges and other | 51.3 | 57.6
Total other assets | 404.6 | 416.2
Total assets | 4,816.6 | 4,762.6
Common equity: |  |
Common stock | 66.2 | 66.2
Additional paid-in capital | 959.0 | 959.2
Retained earnings | 608.1 | 557.6
Total common equity | 1,633.3 | 1,583.0
Cumulative preferred stock (Wisconsin Power and Light Company) | 0 | 60.0
Long-term debt, net (excluding current portion) | 1,323.5 | 1,331.5
Total capitalization | 2,956.8 | 2,974.5
Current liabilities: |  |
Current maturities of long-term debt | 8.5 | 0
Commercial paper | 143.4 | 86.6
Accounts payable | 117.9 | 126.4
Accounts payable to associated companies | 20.8 | 13.2
Regulatory liabilities | 58.3 | 59.6
Accrued taxes | 11.2 | 28.3
Other | 59.2 | 71.4
Total current liabilities | 419.3 | 385.5
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 885.4 | 844.1
Regulatory liabilities | 148.9 | 155.1
Capital lease obligations - Sheboygan Falls Energy Facility | 95.7 | 99.1
Pension and other benefit obligations | 156.8 | 159.7
Other | 153.7 | 144.6
Total long-term liabilities and deferred credits | 1,440.5 | 1,402.6
Commitments and contingencies (Note 12) |  |
Total capitalization and liabilities | $ 4,816.6 | $ 4,762.6

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