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Condensed Consolidated Balance Sheets (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Utility:  
Electric plant in service$ 8,103.9$ 7,676.8
Gas plant in service843.0830.1
Other plant in service508.4499.2
Accumulated depreciation(3,176.5)(2,982.2)
Net plant6,278.86,023.9
Construction work in progress:  
Edgewater Generating Station Unit 5 emission controls (Wisconsin Power and Light Company)61.517.2
Bent Tree - Phase I wind project (Wisconsin Power and Light Company) 154.5
Other157.3138.3
Other, less accumulated depreciation34.9126.0
Total utility6,532.56,459.9
Non-regulated and other:  
Non-regulated Generation, less accumulated depreciation252.7119.0
Alliant Energy Corporate Services, Inc. and other, less accumulated depreciation152.7151.7
Total non-regulated and other405.4270.7
Total property, plant and equipment6,937.96,730.6
Current assets:  
Cash and cash equivalents45.7159.3
Accounts receivable:  
Customer, less allowance for doubtful accounts198.5120.5
Unbilled utility revenues56.782.3
Other, less allowance for doubtful accounts146.9213.1
Income tax refunds receivable47.439.3
Production fuel, at weighted average cost96.8122.8
Materials and supplies, at weighted average cost61.161.6
Gas stored underground, at weighted average cost47.248.6
Regulatory assets92.0109.0
Derivative assets22.719.1
Prepayments and other132.1117.1
Total current assets947.11,092.7
Investments:  
Investment in American Transmission Company LLC237.1227.9
Other62.161.3
Total investments299.2289.2
Other assets:  
Regulatory assets1,203.71,032.7
Deferred charges and other93.4137.7
Total other assets1,297.11,170.4
Total assets9,481.39,282.9
Common equity:  
Common stock1.11.1
Additional paid-in capital1,509.11,506.8
Retained earnings1,500.21,394.7
Accumulated other comprehensive loss(0.6)(1.4)
Shares in deferred compensation trust - 259,247 and 246,301 shares at a weighted average cost of $31.47 and $30.75 per share(8.2)(7.6)
Total common equity3,001.62,893.6
Cumulative preferred stock145.1183.8
Noncontrolling interest1.82.0
Total equity3,148.53,079.4
Cumulative preferred stock60.060.0
Long-term debt, net (excluding current portion)2,703.62,703.4
Total capitalization5,912.15,842.8
Current liabilities:  
Current maturities of long-term debt1.41.3
Commercial paper22.147.4
Accounts payable314.6336.3
Regulatory liabilities157.9173.7
Accrued taxes37.845.3
Accrued interest46.646.7
Derivative liabilities41.355.3
Other152.7160.7
Total current liabilities774.4866.7
Other long-term liabilities and deferred credits:  
Deferred income taxes1,561.21,434.3
Regulatory liabilities746.1626.4
Pension and other benefit obligations235.9303.8
Other251.6208.9
Total long-term liabilities and deferred credits2,794.82,573.4
Total capitalization and liabilities9,481.39,282.9
IPL [Member]
  
Utility:  
Electric plant in service4,651.94,562.2
Gas plant in service422.3418.7
Steam plant in service34.934.9
Other plant in service249.1245.3
Accumulated depreciation(1,828.3)(1,738.4)
Net plant3,529.93,522.7
Construction work in progress:  
Other83.174.5
Other, less accumulated depreciation19.8106.0
Non-regulated and other:  
Total property, plant and equipment3,632.83,703.2
Current assets:  
Cash and cash equivalents0.25.7
Accounts receivable:  
Customer, less allowance for doubtful accounts108.7174.1
Income tax refunds receivable19.019.1
Production fuel, at weighted average cost60.880.1
Materials and supplies, at weighted average cost33.233.5
Gas stored underground, at weighted average cost27.821.8
Regulatory assets54.559.0
Derivative assets15.512.6
Prepayments and other21.322.3
Total current assets341.0428.2
Investments:  
Total investments17.016.4
Other assets:  
Regulatory assets948.3740.6
Deferred charges and other21.649.2
Total other assets969.9789.8
Total assets4,960.74,937.6
Common equity:  
Common stock33.433.4
Additional paid-in capital873.8974.0
Retained earnings456.4382.4
Total common equity1,363.61,389.8
Cumulative preferred stock145.1183.8
Total equity1,508.71,573.6
Long-term debt, net (excluding current portion)1,308.91,308.6
Total capitalization2,817.62,882.2
Current liabilities:  
Accounts payable116.5146.0
Accounts payable to associated companies42.037.1
Regulatory liabilities129.5155.8
Accrued taxes34.262.4
Accrued interest23.022.8
Derivative liabilities17.323.0
Other26.635.4
Total current liabilities389.1482.5
Other long-term liabilities and deferred credits:  
Deferred income taxes909.9849.0
Regulatory liabilities584.3472.1
Pension and other benefit obligations72.7110.2
Other187.1141.6
Total long-term liabilities and deferred credits1,754.01,572.9
Total capitalization and liabilities4,960.74,937.6
WPL [Member]
  
Utility:  
Electric plant in service3,452.03,114.6
Gas plant in service420.7411.4
Other plant in service224.4219.0
Accumulated depreciation(1,348.2)(1,243.8)
Net plant2,748.92,501.2
Leased Sheboygan Falls Energy Facility, less accumulated amortization84.789.4
Construction work in progress:  
Edgewater Generating Station Unit 5 emission controls (Wisconsin Power and Light Company)61.517.2
Bent Tree - Phase I wind project (Wisconsin Power and Light Company) 154.5
Other74.263.8
Other, less accumulated depreciation15.120.0
Non-regulated and other:  
Total property, plant and equipment2,984.42,846.1
Current assets:  
Cash and cash equivalents23.50.1
Accounts receivable:  
Customer, less allowance for doubtful accounts80.384.2
Unbilled utility revenues56.782.3
Other, less allowance for doubtful accounts36.538.1
Income tax refunds receivable15.540.6
Production fuel, at weighted average cost36.042.7
Materials and supplies, at weighted average cost26.725.7
Gas stored underground, at weighted average cost19.426.8
Regulatory assets37.550.0
Prepaid gross receipts tax29.338.6
Derivative assets6.86.5
Prepayments and other24.89.4
Total current assets393.0445.0
Investments:  
Investment in American Transmission Company LLC237.1227.9
Other19.720.8
Total investments256.8248.7
Other assets:  
Regulatory assets255.4292.1
Deferred charges and other47.257.7
Total other assets302.6349.8
Total assets3,936.83,889.6
Common equity:  
Common stock66.266.2
Additional paid-in capital869.0844.0
Retained earnings494.1459.1
Total common equity1,429.31,369.3
Cumulative preferred stock60.060.0
Long-term debt, net (excluding current portion)1,082.11,081.7
Total capitalization2,571.42,511.0
Current liabilities:  
Commercial paper 47.4
Accounts payable93.7118.5
Accounts payable to associated companies22.716.0
Regulatory liabilities28.417.9
Accrued interest18.121.6
Derivative liabilities24.032.3
Other29.338.9
Total current liabilities216.2292.6
Other long-term liabilities and deferred credits:  
Deferred income taxes654.8570.4
Regulatory liabilities161.8154.3
Capital lease obligations - Sheboygan Falls Energy Facility104.3107.0
Pension and other benefit obligations103.7119.2
Other124.6135.1
Total long-term liabilities and deferred credits1,149.21,086.0
Total capitalization and liabilities$ 3,936.8$ 3,889.6