v2.4.0.6

Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Utility: |  |
Electric plant in service | $ 8,335.4 | $ 8,165.4
Gas plant in service | 869.4 | 852.9
Other plant in service | 512.5 | 510.1
Accumulated depreciation | (3,351.5) | (3,206.0)
Net plant | 6,365.8 | 6,322.4
Construction work in progress: |  |
Edgewater Generating Station Unit 5 emission controls (Wisconsin Power and Light Company) | 124.0 | 77.7
Columbia Energy Center Units 1 and 2 emission controls (Wisconsin Power and Light Company) | 91.6 | 9.0
George Neal Generating Station Units 3 and 4 emission controls (Interstate Power and Light Company) | 53.5 | 8.3
Ottumwa Generating Station Unit 1 emission controls (Interstate Power and Light Company) | 53.3 | 7.7
Other | 159.1 | 154.5
Other, less accumulated depreciation | 21.3 | 34.9
Total utility | 6,868.6 | 6,614.5
Non-regulated and other: |  |
Non-regulated Generation, less accumulated depreciation | 326.5 | 270.6
Alliant Energy Corporate Services, Inc. and other, less accumulated depreciation | 189.5 | 148.2
Total non-regulated and other | 516.0 | 418.8
Total property, plant and equipment | 7,384.6 | 7,033.3
Current assets: |  |
Cash and cash equivalents | 41.1 | 11.4
Accounts receivable: |  |
Customer, less allowance for doubtful accounts | 93.9 | 88.1
Unbilled utility revenues | 59.8 | 75.1
Other, less allowance for doubtful accounts | 239.7 | 114.9
Income tax refunds receivable | 43.9 | 39.1
Production fuel, at weighted average cost | 110.5 | 101.9
Materials and supplies, at weighted average cost | 61.4 | 58.5
Gas stored underground, at weighted average cost | 37.3 | 57.7
Regulatory assets | 92.9 | 103.6
Derivative assets | 35.9 | 12.7
Prepaid gross receipts tax | 29.1 | 40.2
Deferred income tax assets | 90.0 | 22.8
Assets held for sale | 51.4 | 119.6
Prepayments and other | 41.7 | 25.0
Total current assets | 1,028.6 | 870.6
Investments: |  |
Investment in American Transmission Company LLC | 253.2 | 238.8
Other | 60.9 | 61.9
Total investments | 314.1 | 300.7
Other assets: |  |
Regulatory assets | 1,425.5 | 1,391.4
Deferred charges and other | 98.1 | 91.9
Total other assets | 1,523.6 | 1,483.3
Total assets | 10,250.9 | 9,687.9
Stockholders' Equity Attributable to Parent [Abstract] |  |
Common stock | 1.1 | 1.1
Additional paid-in capital | 1,512.1 | 1,510.8
Retained earnings | 1,612.1 | 1,510.2
Accumulated other comprehensive loss | (0.8) | (0.8)
Shares in deferred compensation trust - 261,057 and 262,735 shares at a weighted average cost of $32.68 and $31.68 per share | (8.5) | (8.3)
Total common equity | 3,116.0 | 3,013.0
Cumulative preferred stock (Interstate Power and Light Company) | 145.1 | 145.1
Noncontrolling interest | 1.7 | 1.8
Total equity | 3,262.8 | 3,159.9
Cumulative preferred stock (Wisconsin Power and Light Company) | 60.0 | 60.0
Long-term debt, net (excluding current portion) | 2,828.1 | 2,703.1
Total capitalization | 6,150.9 | 5,923.0
Current liabilities: |  |
Current maturities of long-term debt | 1.4 | 1.4
Commercial paper | 70.4 | 102.8
Accounts payable | 418.0 | 267.8
Regulatory liabilities | 168.5 | 164.7
Accrued taxes | 37.4 | 46.9
Accrued interest | 46.6 | 46.6
Derivative liabilities | 37.8 | 55.9
Liabilities held for sale | 66.1 | 62.1
Other | 99.3 | 107.0
Total current liabilities | 945.5 | 855.2
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 1,836.7 | 1,592.2
Regulatory liabilities | 737.9 | 745.4
Pension and other benefit obligations | 310.8 | 312.7
Other | 269.1 | 259.4
Total long-term liabilities and deferred credits | 3,154.5 | 2,909.7
Total capitalization and liabilities | 10,250.9 | 9,687.9
IPL [Member] |  |
Utility: |  |
Electric plant in service | 4,767.4 | 4,684.0
Gas plant in service | 436.9 | 428.2
Steam plant in service | 34.9 | 34.9
Other plant in service | 253.6 | 246.4
Accumulated depreciation | (1,907.0) | (1,833.8)
Net plant | 3,585.8 | 3,559.7
Construction work in progress: |  |
George Neal Generating Station Units 3 and 4 emission controls (Interstate Power and Light Company) | 53.5 | 8.3
Ottumwa Generating Station Unit 1 emission controls (Interstate Power and Light Company) | 53.3 | 7.7
Other | 87.4 | 80.6
Other, less accumulated depreciation | 19.8 | 19.8
Non-regulated and other: |  |
Total property, plant and equipment | 3,799.8 | 3,676.1
Current assets: |  |
Cash and cash equivalents | 5.3 | 2.1
Accounts receivable: |  |
Customer, less allowance for doubtful accounts | 183.4 | 75.2
Income tax refunds receivable | 20.7 | 28.4
Production fuel, at weighted average cost | 76.1 | 67.7
Materials and supplies, at weighted average cost | 33.3 | 31.5
Gas stored underground, at weighted average cost | 19.6 | 25.5
Regulatory assets | 55.2 | 59.0
Derivative assets | 25.9 | 9.2
Deferred income tax assets | 35.9 | 13.5
Prepayments and other | 11.9 | 11.0
Total current assets | 467.3 | 323.1
Investments: |  |
Total investments | 17.0 | 16.8
Other assets: |  |
Regulatory assets | 1,095.8 | 1,058.3
Deferred charges and other | 19.3 | 19.2
Total other assets | 1,115.1 | 1,077.5
Total assets | 5,399.2 | 5,093.5
Stockholders' Equity Attributable to Parent [Abstract] |  |
Common stock | 33.4 | 33.4
Additional paid-in capital | 1,007.8 | 927.7
Retained earnings | 456.9 | 433.3
Total common equity | 1,498.1 | 1,394.4
Cumulative preferred stock (Interstate Power and Light Company) | 145.1 | 145.1
Total equity | 1,643.2 | 1,539.5
Long-term debt, net (excluding current portion) | 1,359.3 | 1,309.0
Total capitalization | 3,002.5 | 2,848.5
Current liabilities: |  |
Commercial paper | 0 | 7.1
Accounts payable | 231.4 | 118.2
Accounts payable to associated companies | 35.1 | 36.7
Regulatory liabilities | 111.0 | 137.1
Accrued taxes | 38.0 | 43.8
Accrued interest | 22.9 | 22.8
Derivative liabilities | 17.9 | 24.5
Other | 34.2 | 32.3
Total current liabilities | 490.5 | 422.5
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 1,039.4 | 936.9
Regulatory liabilities | 577.1 | 584.2
Pension and other benefit obligations | 99.8 | 101.9
Other | 189.9 | 199.5
Total long-term liabilities and deferred credits | 1,906.2 | 1,822.5
Total capitalization and liabilities | 5,399.2 | 5,093.5
WPL [Member] |  |
Utility: |  |
Electric plant in service | 3,568.0 | 3,481.4
Gas plant in service | 432.5 | 424.7
Other plant in service | 224.0 | 228.8
Accumulated depreciation | (1,444.5) | (1,372.2)
Net plant | 2,780.0 | 2,762.7
Leased Sheboygan Falls Energy Facility, less accumulated amortization | 78.6 | 83.2
Construction work in progress: |  |
Edgewater Generating Station Unit 5 emission controls (Wisconsin Power and Light Company) | 124.0 | 77.7
Columbia Energy Center Units 1 and 2 emission controls (Wisconsin Power and Light Company) | 91.6 | 9.0
Other | 71.7 | 73.9
Other, less accumulated depreciation | 1.5 | 15.1
Non-regulated and other: |  |
Total property, plant and equipment | 3,147.4 | 3,021.6
Current assets: |  |
Cash and cash equivalents | 16.2 | 2.7
Accounts receivable: |  |
Customer, less allowance for doubtful accounts | 84.6 | 76.2
Unbilled utility revenues | 59.8 | 75.1
Other, less allowance for doubtful accounts | 44.4 | 38.2
Income tax refunds receivable | 23.0 | 0.7
Production fuel, at weighted average cost | 34.4 | 34.2
Materials and supplies, at weighted average cost | 26.7 | 25.7
Gas stored underground, at weighted average cost | 17.7 | 32.2
Regulatory assets | 37.7 | 44.6
Derivative assets | 10.0 | 3.5
Prepaid gross receipts tax | 29.1 | 40.2
Deferred income tax assets | 50.3 | 6.0
Prepayments and other | 20.8 | 6.7
Total current assets | 454.7 | 386.0
Investments: |  |
Investment in American Transmission Company LLC | 253.2 | 238.8
Other | 19.3 | 19.8
Total investments | 272.5 | 258.6
Other assets: |  |
Regulatory assets | 329.7 | 333.1
Deferred charges and other | 53.6 | 44.7
Total other assets | 383.3 | 377.8
Total assets | 4,257.9 | 4,044.0
Stockholders' Equity Attributable to Parent [Abstract] |  |
Common stock | 66.2 | 66.2
Additional paid-in capital | 869.2 | 869.0
Retained earnings | 545.3 | 507.2
Total common equity | 1,480.7 | 1,442.4
Cumulative preferred stock (Wisconsin Power and Light Company) | 60.0 | 60.0
Long-term debt, net (excluding current portion) | 1,082.5 | 1,082.2
Total capitalization | 2,623.2 | 2,584.6
Current liabilities: |  |
Commercial paper | 0 | 25.7
Accounts payable | 133.5 | 98.5
Accounts payable to associated companies | 20.5 | 20.5
Regulatory liabilities | 57.5 | 27.6
Accrued interest | 18.1 | 21.6
Derivative liabilities | 19.9 | 31.4
Other | 38.3 | 32.3
Total current liabilities | 287.8 | 257.6
Other long-term liabilities and deferred credits: |  |
Deferred income tax liabilities | 809.3 | 672.5
Regulatory liabilities | 160.8 | 161.2
Capital lease obligations - Sheboygan Falls Energy Facility | 100.2 | 103.3
Pension and other benefit obligations | 127.8 | 128.0
Other | 148.8 | 136.8
Total long-term liabilities and deferred credits | 1,346.9 | 1,201.8
Total capitalization and liabilities | $ 4,257.9 | $ 4,044.0

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 7, 10, 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable, which is expected to be collected within a year within one year (or one operating cycle, if longer) from the date of the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57795-111642 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c(3) -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 45 -Paragraph 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57807-111642 + Details
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- Definition The current portion of the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference. An unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward is presented as a reduction of the related deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31928-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42, 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31958-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31917-109318 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907571&loc=d3e31931-109318 + Details
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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 Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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