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Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Utility: |  |
Electric plant | $ 9,510.8 | $ 9,415.7
Gas plant | 918.8 | 909.9
Other plant | 550.8 | 547.9
Accumulated depreciation | (3,789.5) | (3,726.2)
Net plant | 7,190.9 | 7,147.3
Construction work in progress: |  |
Columbia Energy Center Units 1 and 2 emission controls (WPL) | 274.6 | 265.0
Ottumwa Generating Station Unit 1 emission controls (IPL) | 144.0 | 135.1
George Neal Generating Station Unit 3 emission controls (IPL) | 59.6 | 54.6
Other | 252.2 | 223.2
Other, less accumulated depreciation | 22.3 | 22.3
Total utility | 7,943.6 | 7,847.5
Non-regulated and other: |  |
Non-regulated Generation, less accumulated depreciation | 247.2 | 249.4
Alliant Energy Corporate Services, Inc. and other, less accumulated depreciation | 235.4 | 229.6
Total non-regulated and other | 482.6 | 479.0
Total property, plant and equipment | 8,426.2 | 8,326.5
Current assets: |  |
Cash and cash equivalents | 14.5 | 9.8
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 106.6 | 81.8
Unbilled utility revenues | 78.3 | 92.3
Other | 311.7 | 299.2
Production fuel, at weighted average cost | 68.8 | 103.6
Materials and supplies, at weighted average cost | 72.1 | 69.6
Gas stored underground, at weighted average cost | 10.1 | 38.6
Regulatory assets | 64.4 | 53.9
Other | 209.7 | 262.4
Total current assets | 936.2 | 1,011.2
Investments: |  |
Investment in American Transmission Company LLC | 276.9 | 272.1
Other | 56.0 | 57.5
Total investments | 332.9 | 329.6
Other assets: |  |
Regulatory assets | 1,352.9 | 1,359.3
Deferred charges and other | 68.6 | 85.8
Total other assets | 1,421.5 | 1,445.1
Total assets | 11,116.8 | 11,112.4
Common equity: |  |
Common stock | 1.1 | 1.1
Additional paid-in capital | 1,506.4 | 1,507.8
Retained earnings | 1,832.2 | 1,780.7
Accumulated other comprehensive loss | (0.2) | (0.2)
Shares in deferred compensation trust - 224,076 and 227,469 shares at a weighted average cost of $35.89 and $35.25 per share | (8.0) | (8.0)
Total common equity | 3,331.5 | 3,281.4
Cumulative preferred stock (Interstate Power and Light Company) | 200.0 | 200.0
Noncontrolling interest | 1.7 | 1.8
Total equity | 3,533.2 | 3,483.2
Long-term debt, net (excluding current portion) | 2,980.6 | 2,977.8
Total capitalization | 6,513.8 | 6,461.0
Current liabilities: |  |
Current maturities of long-term debt | 358.8 | 358.5
Commercial paper | 221.3 | 279.4
Accounts payable | 388.1 | 365.0
Regulatory liabilities | 224.5 | 196.6
Other | 191.5 | 233.8
Total current liabilities | 1,384.2 | 1,433.3
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 2,141.7 | 2,112.7
Regulatory liabilities | 611.9 | 624.9
Pension and other benefit obligations | 203.0 | 206.6
Other | 262.2 | 273.9
Total long-term liabilities and deferred credits | 3,218.8 | 3,218.1
Commitments and contingencies (Note 13) |  |
Total capitalization and liabilities | 11,116.8 | 11,112.4
IPL [Member] |  |
Utility: |  |
Electric plant | 5,089.0 | 5,034.9
Gas plant | 463.5 | 456.8
Other plant | 304.3 | 302.8
Accumulated depreciation | (2,055.5) | (2,025.3)
Net plant | 3,801.3 | 3,769.2
Construction work in progress: |  |
Ottumwa Generating Station Unit 1 emission controls (IPL) | 144.0 | 135.1
George Neal Generating Station Unit 3 emission controls (IPL) | 59.6 | 54.6
Other | 168.1 | 156.7
Other, less accumulated depreciation | 21.3 | 21.2
Non-regulated and other: |  |
Total property, plant and equipment | 4,194.3 | 4,136.8
Current assets: |  |
Cash and cash equivalents | 5.8 | 4.4
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 257.5 | 246.9
Production fuel, at weighted average cost | 54.6 | 75.6
Materials and supplies, at weighted average cost | 40.6 | 39.4
Gas stored underground, at weighted average cost | 5.6 | 18.9
Regulatory assets | 26.6 | 28.5
Other | 106.6 | 122.2
Total current assets | 497.3 | 535.9
Investments: |  |
Total investments | 18.6 | 18.6
Other assets: |  |
Regulatory assets | 1,091.4 | 1,085.0
Deferred charges and other | 29.0 | 29.7
Total other assets | 1,120.4 | 1,114.7
Total assets | 5,830.6 | 5,806.0
Common equity: |  |
Common stock | 33.4 | 33.4
Additional paid-in capital | 1,182.8 | 1,152.8
Retained earnings | 501.9 | 493.5
Total common equity | 1,718.1 | 1,679.7
Cumulative preferred stock (Interstate Power and Light Company) | 200.0 | 200.0
Total equity | 1,918.1 | 1,879.7
Long-term debt, net (excluding current portion) | 1,520.2 | 1,520.0
Total capitalization | 3,438.3 | 3,399.7
Current liabilities: |  |
Current maturities of long-term debt | 38.4 | 38.4
Commercial paper | 0 |
Accounts payable | 214.7 | 187.1
Accounts payable to associated companies | 0.3 | 29.1
Regulatory liabilities | 155.2 | 143.8
Accrued taxes | 37.4 | 51.1
Other | 61.9 | 74.8
Total current liabilities | 507.9 | 524.3
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 1,216.0 | 1,193.0
Regulatory liabilities | 448.8 | 471.1
Pension and other benefit obligations | 47.9 | 48.6
Other | 171.7 | 169.3
Total long-term liabilities and deferred credits | 1,884.4 | 1,882.0
Commitments and contingencies (Note 13) |  |
Total capitalization and liabilities | 5,830.6 | 5,806.0
WPL [Member] |  |
Utility: |  |
Electric plant | 4,421.8 | 4,380.8
Gas plant | 455.3 | 453.1
Other plant | 246.5 | 245.1
Accumulated depreciation | (1,734.0) | (1,700.9)
Net plant | 3,389.6 | 3,378.1
Leased Sheboygan Falls Energy Facility, less accumulated amortization | 69.3 | 70.9
Construction work in progress: |  |
Columbia Energy Center Units 1 and 2 emission controls (WPL) | 274.6 | 265.0
Other | 84.1 | 66.5
Other, less accumulated depreciation | 1.0 | 1.1
Non-regulated and other: |  |
Total property, plant and equipment | 3,818.6 | 3,781.6
Current assets: |  |
Cash and cash equivalents | 4.9 | 0.5
Accounts receivable, less allowance for doubtful accounts: |  |
Customer | 98.8 | 73.0
Unbilled utility revenues | 78.3 | 92.3
Other | 39.7 | 33.1
Production fuel, at weighted average cost | 14.2 | 28.0
Materials and supplies, at weighted average cost | 29.6 | 28.9
Gas stored underground, at weighted average cost | 4.5 | 19.7
Regulatory assets | 37.8 | 25.4
Other | 92.5 | 101.7
Total current assets | 400.3 | 402.6
Investments: |  |
Investment in American Transmission Company LLC | 276.9 | 272.1
Other | 17.9 | 19.5
Total investments | 294.8 | 291.6
Other assets: |  |
Regulatory assets | 261.5 | 274.3
Deferred charges and other | 38.5 | 54.3
Total other assets | 300.0 | 328.6
Total assets | 4,813.7 | 4,804.4
Common equity: |  |
Common stock | 66.2 | 66.2
Additional paid-in capital | 959.0 | 959.0
Retained earnings | 642.3 | 617.2
Total common equity | 1,667.5 | 1,642.4
Noncontrolling interest | 2.6 | 0
Total equity | 1,670.1 | 1,642.4
Long-term debt, net (excluding current portion) | 1,323.7 | 1,323.6
Total capitalization | 2,993.8 | 2,966.0
Current liabilities: |  |
Current maturities of long-term debt | 8.5 | 8.5
Commercial paper | 155.5 | 183.7
Accounts payable | 114.2 | 120.0
Accounts payable to associated companies | 20.2 | 26.0
Regulatory liabilities | 69.3 | 52.8
Other | 64.0 | 60.5
Total current liabilities | 431.7 | 451.5
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 902.0 | 897.1
Regulatory liabilities | 163.1 | 153.8
Capital lease obligations - Sheboygan Falls Energy Facility | 93.3 | 94.5
Pension and other benefit obligations | 87.4 | 88.4
Other | 142.4 | 153.1
Total long-term liabilities and deferred credits | 1,388.2 | 1,386.9
Commitments and contingencies (Note 13) |  |
Total capitalization and liabilities | $ 4,813.7 | $ 4,804.4

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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