Document_And_Entity_Informatio
Document And Entity Information | 9 Months Ended |
Sep. 30, 2014 | |
Document Type | '10-Q |
Amendment Flag | 'false |
Document Period End Date | 30-Sep-14 |
Document Fiscal Year Focus | '2014 |
Document Fiscal Period Focus | 'Q3 |
Entity Registrant Name | 'ALLIANT ENERGY CORP |
Entity Central Index Key | '0000352541 |
Current Fiscal Year End Date | '--12-31 |
Entity Filer Category | 'Large Accelerated Filer |
Entity Common Stock, Shares Outstanding | 110,935,680 |
IPL [Member] | ' |
Entity Registrant Name | 'INTERSTATE POWER & LIGHT CO |
Entity Central Index Key | '0000052485 |
Entity Filer Category | 'Non-accelerated Filer |
Entity Common Stock, Shares Outstanding | 13,370,788 |
WPL [Member] | ' |
Entity Registrant Name | 'WISCONSIN POWER & LIGHT CO |
Entity Central Index Key | '0000107832 |
Entity Filer Category | 'Non-accelerated Filer |
Entity Common Stock, Shares Outstanding | 13,236,601 |
Condensed_Consolidated_Stateme
Condensed Consolidated Statements Of Income (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, except Per Share data, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Utility: | ' | ' | ' | ' |
Electric | $771.20 | $798.10 | $2,090.90 | $2,043.40 |
Gas | 47.2 | 39.8 | 364.8 | 310.5 |
Other | 12.2 | 17.4 | 50.6 | 52.4 |
Non-regulated | 12.5 | 11.3 | 39.9 | 37.9 |
Total operating revenues | 843.1 | 866.6 | 2,546.20 | 2,444.20 |
Utility: | ' | ' | ' | ' |
Electric production fuel and energy purchases | 230.7 | 205.4 | 658.7 | 542.5 |
Purchased electric capacity | 0.1 | 58.6 | 24.9 | 167.6 |
Electric transmission service | 114 | 110.5 | 333.6 | 313.8 |
Cost of gas sold | 21.8 | 14.3 | 228.7 | 181.2 |
Other operation and maintenance | 156.7 | 156.3 | 478.4 | 453.7 |
Non-regulated operation and maintenance | 2.3 | 3.1 | 5.4 | 8.4 |
Depreciation and amortization | 97.1 | 92.1 | 288.4 | 277.4 |
Taxes other than income taxes | 25.6 | 24.9 | 75.8 | 74.3 |
Total operating expenses | 648.3 | 665.2 | 2,093.90 | 2,018.90 |
Operating income | 194.8 | 201.4 | 452.3 | 425.3 |
Interest expense and other: | ' | ' | ' | ' |
Interest expense | 44.6 | 42.5 | 134.9 | 127.6 |
Equity income from unconsolidated investments, net | -11.5 | -11.1 | -34.2 | -32.7 |
Allowance for funds used during construction | -8.3 | -8.5 | -25.8 | -21.1 |
Interest income and other | -0.2 | -0.6 | -1.8 | -1.7 |
Total interest expense and other | 24.6 | 22.3 | 73.1 | 72.1 |
Income from continuing operations before income taxes | 170.2 | 179.1 | 379.2 | 353.2 |
Income tax expense (benefit) | 12.4 | 17.6 | 46.2 | 40.2 |
Income from continuing operations, net of tax | 157.8 | 161.5 | 333 | 313 |
Income (loss) from discontinued operations, net of tax | -1.9 | -1.3 | -2.2 | -4.9 |
Net income (loss) | 155.9 | 160.2 | 330.8 | 308.1 |
Preferred dividend requirements of subsidiaries | 2.6 | 2.6 | 7.7 | 15.3 |
Net income (loss) attributable to common shareowners | 153.3 | 157.6 | 323.1 | 292.8 |
Weighted average number of common shares outstanding (basic and diluted) (in shares) | 110.8 | 110.8 | 110.8 | 110.8 |
Earnings per weighted average common share attributable to Alliant Energy common shareowners (basic and diluted): | ' | ' | ' | ' |
Income from continuing operations, net of tax (in dollars per share) | $1.40 | $1.43 | $2.94 | $2.69 |
Income (loss) from discontinued operations, net of tax (in dollars per share) | ($0.02) | ($0.01) | ($0.02) | ($0.05) |
Net income (in dollars per share) | $1.38 | $1.42 | $2.92 | $2.64 |
Amounts attributable to common shareowners: | ' | ' | ' | ' |
Income from continuing operations, net of tax | 155.2 | 158.9 | 325.3 | 297.7 |
Income (loss) from discontinued operations, net of tax | -1.9 | -1.3 | -2.2 | -4.9 |
Net income (loss) attributable to common shareowners | 153.3 | 157.6 | 323.1 | 292.8 |
Dividends declared per common share (in dollars per share) | $0.51 | $0.47 | $1.53 | $1.41 |
IPL [Member] | ' | ' | ' | ' |
Utility: | ' | ' | ' | ' |
Electric | 435.9 | 457.6 | 1,164.70 | 1,137.40 |
Gas | 28.7 | 24.6 | 208.1 | 180.9 |
Other | 11.6 | 12.2 | 44.2 | 37.4 |
Total operating revenues | 476.2 | 494.4 | 1,417 | 1,355.70 |
Utility: | ' | ' | ' | ' |
Electric production fuel and energy purchases | 132.1 | 110.9 | 370.2 | 282.5 |
Purchased electric capacity | 0.1 | 42.7 | 24.9 | 120.3 |
Electric transmission service | 82.7 | 80 | 241.7 | 226 |
Cost of gas sold | 14.6 | 9.3 | 128.4 | 103.2 |
Other operation and maintenance | 89.8 | 90.5 | 279.1 | 264.2 |
Depreciation and amortization | 49.3 | 47.6 | 146.9 | 142.8 |
Taxes other than income taxes | 13.7 | 13.4 | 40.4 | 40.9 |
Total operating expenses | 382.3 | 394.4 | 1,231.60 | 1,179.90 |
Operating income | 93.9 | 100 | 185.4 | 175.8 |
Interest expense and other: | ' | ' | ' | ' |
Interest expense | 21.9 | 19.6 | 67 | 58.9 |
Allowance for funds used during construction | -6.6 | -5.8 | -18.6 | -14.3 |
Interest income and other | 0 | 0 | -0.1 | -0.2 |
Total interest expense and other | 15.3 | 13.8 | 48.3 | 44.4 |
Income from continuing operations before income taxes | 78.6 | 86.2 | 137.1 | 131.4 |
Income tax expense (benefit) | -26.5 | -26.4 | -34.9 | -37.4 |
Net income (loss) | 105.1 | 112.6 | 172 | 168.8 |
Preferred dividend requirements of subsidiaries | 2.6 | 2.6 | 7.7 | 13.7 |
Net income (loss) attributable to common shareowners | 102.5 | 110 | 164.3 | 155.1 |
Amounts attributable to common shareowners: | ' | ' | ' | ' |
Net income (loss) attributable to common shareowners | 102.5 | 110 | 164.3 | 155.1 |
WPL [Member] | ' | ' | ' | ' |
Utility: | ' | ' | ' | ' |
Electric | 335.3 | 340.5 | 926.2 | 906 |
Gas | 18.5 | 15.2 | 156.7 | 129.6 |
Other | 0.6 | 5.2 | 6.4 | 15 |
Total operating revenues | 354.4 | 360.9 | 1,089.30 | 1,050.60 |
Utility: | ' | ' | ' | ' |
Electric production fuel and energy purchases | 98.6 | 94.5 | 288.5 | 260 |
Purchased electric capacity | 0 | 15.9 | 0 | 47.3 |
Electric transmission service | 31.3 | 30.5 | 91.9 | 87.8 |
Cost of gas sold | 7.2 | 5 | 100.3 | 78 |
Other operation and maintenance | 66.9 | 65.8 | 199.3 | 189.5 |
Depreciation and amortization | 45.6 | 42.7 | 135 | 129 |
Taxes other than income taxes | 10.9 | 10.6 | 32.7 | 30.7 |
Total operating expenses | 260.5 | 265 | 847.7 | 822.3 |
Operating income | 93.9 | 95.9 | 241.6 | 228.3 |
Interest expense and other: | ' | ' | ' | ' |
Interest expense | 21 | 21.2 | 63.2 | 63.8 |
Equity income from unconsolidated investments, net | -11.4 | -11.1 | -34.2 | -32.7 |
Allowance for funds used during construction | -1.7 | -2.7 | -7.2 | -6.8 |
Interest income and other | 0.5 | 0 | 0.8 | 0 |
Total interest expense and other | 8.4 | 7.4 | 22.6 | 24.3 |
Income from continuing operations before income taxes | 85.5 | 88.5 | 219 | 204 |
Income tax expense (benefit) | 23.9 | 27.2 | 68 | 64.7 |
Net income (loss) | 61.6 | 61.3 | 151 | 139.3 |
Preferred dividend requirements of subsidiaries | 0 | 0 | 0 | 1.6 |
Net income (loss) attributable to common shareowners | 61.6 | 61.3 | 151 | 137.7 |
Amounts attributable to common shareowners: | ' | ' | ' | ' |
Net income (loss) attributable to common shareowners | $61.60 | $61.30 | $151 | $137.70 |
Condensed_Consolidated_Balance
Condensed Consolidated Balance Sheets (USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified | ||
Utility: | ' | ' |
Electric plant | $10,016.30 | $9,415.70 |
Gas plant | 936.6 | 909.9 |
Other plant | 550.4 | 547.9 |
Accumulated depreciation | -3,896.20 | -3,726.20 |
Net plant | 7,607.10 | 7,147.30 |
Construction work in progress | 639.1 | 677.9 |
Other, less accumulated depreciation | 22 | 22.3 |
Total utility | 8,268.20 | 7,847.50 |
Non-regulated and other: | ' | ' |
Non-regulated Generation, less accumulated depreciation | 242.8 | 249.4 |
Alliant Energy Corporate Services, Inc. and other, less accumulated depreciation | 252.6 | 229.6 |
Total non-regulated and other | 495.4 | 479 |
Total property, plant and equipment | 8,763.60 | 8,326.50 |
Current assets: | ' | ' |
Cash and cash equivalents | 11 | 9.8 |
Accounts receivable, less allowance for doubtful accounts: | ' | ' |
Customer | 84.3 | 81.8 |
Unbilled utility revenues | 64.6 | 92.3 |
Other | 249.1 | 299.2 |
Production fuel, at weighted average cost | 78.1 | 103.6 |
Materials and supplies, at weighted average cost | 72.9 | 69.6 |
Gas stored underground, at weighted average cost | 53.2 | 38.6 |
Regulatory assets | 54.7 | 53.9 |
Other | 294.4 | 262.4 |
Total current assets | 962.3 | 1,011.20 |
Investments: | ' | ' |
Investment in American Transmission Company LLC | 285.6 | 272.1 |
Other | 57.7 | 57.5 |
Total investments | 343.3 | 329.6 |
Other assets: | ' | ' |
Regulatory assets | 1,469.60 | 1,359.30 |
Deferred charges and other | 55.2 | 85.8 |
Total other assets | 1,524.80 | 1,445.10 |
Total assets | 11,594 | 11,112.40 |
Common equity: | ' | ' |
Common stock | 1.1 | 1.1 |
Additional paid-in capital | 1,508.90 | 1,507.80 |
Retained earnings | 1,934.50 | 1,780.70 |
Accumulated other comprehensive loss | -0.2 | -0.2 |
Shares in deferred compensation trust - 234,836 and 227,469 shares at a weighted average cost of $36.94 and $35.25 per share | -8.7 | -8 |
Total common equity | 3,435.60 | 3,281.40 |
Cumulative preferred stock (Interstate Power and Light Company) | 200 | 200 |
Noncontrolling interest | 1.7 | 1.8 |
Total equity | 3,637.30 | 3,483.20 |
Long-term debt, net (excluding current portion) | 2,799.50 | 2,977.80 |
Total capitalization | 6,436.80 | 6,461 |
Current liabilities: | ' | ' |
Current maturities of long-term debt | 492.8 | 358.5 |
Commercial paper | 353.8 | 279.4 |
Accounts payable | 471.1 | 365 |
Regulatory liabilities | 220.2 | 196.6 |
Other | 204 | 233.8 |
Total current liabilities | 1,741.90 | 1,433.30 |
Other long-term liabilities and deferred credits: | ' | ' |
Deferred income tax liabilities | 2,290.30 | 2,112.70 |
Regulatory liabilities | 656.6 | 624.9 |
Pension and other benefit obligations | 201.3 | 206.6 |
Other | 267.1 | 273.9 |
Total long-term liabilities and deferred credits | 3,415.30 | 3,218.10 |
Commitments and contingencies (Note 14) | ' | ' |
Total capitalization and liabilities | 11,594 | 11,112.40 |
IPL [Member] | ' | ' |
Utility: | ' | ' |
Electric plant | 5,252.60 | 5,034.90 |
Gas plant | 471.1 | 456.8 |
Other plant | 306.5 | 302.8 |
Accumulated depreciation | -2,118.30 | -2,025.30 |
Net plant | 3,911.90 | 3,769.20 |
Construction work in progress | 500.2 | 346.4 |
Other, less accumulated depreciation | 21.4 | 21.2 |
Non-regulated and other: | ' | ' |
Total property, plant and equipment | 4,433.50 | 4,136.80 |
Current assets: | ' | ' |
Cash and cash equivalents | 4.6 | 4.4 |
Accounts receivable, less allowance for doubtful accounts: | ' | ' |
Customer | 200.1 | 246.9 |
Production fuel, at weighted average cost | 51.8 | 75.6 |
Materials and supplies, at weighted average cost | 41.3 | 39.4 |
Gas stored underground, at weighted average cost | 32.5 | 18.9 |
Regulatory assets | 30.3 | 28.5 |
Other | 166.8 | 122.2 |
Total current assets | 527.4 | 535.9 |
Investments: | ' | ' |
Total investments | 18.8 | 18.6 |
Other assets: | ' | ' |
Regulatory assets | 1,196.50 | 1,085 |
Deferred charges and other | 18.3 | 29.7 |
Total other assets | 1,214.80 | 1,114.70 |
Total assets | 6,194.50 | 5,806 |
Common equity: | ' | ' |
Common stock | 33.4 | 33.4 |
Additional paid-in capital | 1,242.80 | 1,152.80 |
Retained earnings | 552.8 | 493.5 |
Total common equity | 1,829 | 1,679.70 |
Cumulative preferred stock (Interstate Power and Light Company) | 200 | 200 |
Total equity | 2,029 | 1,879.70 |
Long-term debt, net (excluding current portion) | 1,370.30 | 1,520 |
Total capitalization | 3,399.30 | 3,399.70 |
Current liabilities: | ' | ' |
Current maturities of long-term debt | 150 | 38.4 |
Commercial paper | 38 | 0 |
Accounts payable | 286.1 | 187.1 |
Accounts payable to associated companies | 50.2 | 29.1 |
Regulatory liabilities | 143.8 | 143.8 |
Accrued taxes | 34.5 | 51.1 |
Other | 68.4 | 74.8 |
Total current liabilities | 771 | 524.3 |
Other long-term liabilities and deferred credits: | ' | ' |
Deferred income tax liabilities | 1,316.60 | 1,193 |
Regulatory liabilities | 479.4 | 471.1 |
Pension and other benefit obligations | 46.2 | 48.6 |
Other | 182 | 169.3 |
Total long-term liabilities and deferred credits | 2,024.20 | 1,882 |
Commitments and contingencies (Note 14) | ' | ' |
Total capitalization and liabilities | 6,194.50 | 5,806 |
WPL [Member] | ' | ' |
Utility: | ' | ' |
Electric plant | 4,763.70 | 4,380.80 |
Gas plant | 465.5 | 453.1 |
Other plant | 243.9 | 245.1 |
Accumulated depreciation | -1,777.90 | -1,700.90 |
Net plant | 3,695.20 | 3,378.10 |
Leased Sheboygan Falls Energy Facility, less accumulated amortization | 66.3 | 70.9 |
Construction work in progress | 138.9 | 331.5 |
Other, less accumulated depreciation | 0.6 | 1.1 |
Non-regulated and other: | ' | ' |
Total property, plant and equipment | 3,901 | 3,781.60 |
Current assets: | ' | ' |
Cash and cash equivalents | 2.3 | 0.5 |
Accounts receivable, less allowance for doubtful accounts: | ' | ' |
Customer | 76.7 | 73 |
Unbilled utility revenues | 64.6 | 92.3 |
Other | 30.8 | 33.1 |
Production fuel, at weighted average cost | 26.3 | 28 |
Materials and supplies, at weighted average cost | 29.8 | 28.9 |
Gas stored underground, at weighted average cost | 20.7 | 19.7 |
Regulatory assets | 24.4 | 25.4 |
Other | 113.7 | 101.7 |
Total current assets | 389.3 | 402.6 |
Investments: | ' | ' |
Investment in American Transmission Company LLC | 285.6 | 272.1 |
Other | 19 | 19.5 |
Total investments | 304.6 | 291.6 |
Other assets: | ' | ' |
Regulatory assets | 273.1 | 274.3 |
Deferred charges and other | 38.5 | 54.3 |
Total other assets | 311.6 | 328.6 |
Total assets | 4,906.50 | 4,804.40 |
Common equity: | ' | ' |
Common stock | 66.2 | 66.2 |
Additional paid-in capital | 959 | 959 |
Retained earnings | 679.1 | 617.2 |
Total common equity | 1,704.30 | 1,642.40 |
Noncontrolling interest | 7.1 | 0 |
Total equity | 1,711.40 | 1,642.40 |
Long-term debt, net (excluding current portion) | 1,293.40 | 1,323.60 |
Total capitalization | 3,004.80 | 2,966 |
Current liabilities: | ' | ' |
Current maturities of long-term debt | 30.6 | 8.5 |
Commercial paper | 146.7 | 183.7 |
Accounts payable | 118.1 | 120 |
Accounts payable to associated companies | 32.4 | 26 |
Regulatory liabilities | 76.4 | 52.8 |
Other | 54.8 | 60.5 |
Total current liabilities | 459 | 451.5 |
Other long-term liabilities and deferred credits: | ' | ' |
Deferred income tax liabilities | 951.7 | 897.1 |
Regulatory liabilities | 177.2 | 153.8 |
Capital lease obligations - Sheboygan Falls Energy Facility | 90.7 | 94.5 |
Pension and other benefit obligations | 84.3 | 88.4 |
Other | 138.8 | 153.1 |
Total long-term liabilities and deferred credits | 1,442.70 | 1,386.90 |
Commitments and contingencies (Note 14) | ' | ' |
Total capitalization and liabilities | $4,906.50 | $4,804.40 |
Condensed_Consolidated_Balance1
Condensed Consolidated Balance Sheets (Parenthetical) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
Common stock, par value | $0.01 | $0.01 |
Common stock, shares authorized (in shares) | 240,000,000 | 240,000,000 |
Common stock, shares outstanding (in shares) | 110,935,680 | 110,943,669 |
Shares in deferred compensation trust (in shares) | 234,836 | 227,469 |
Shares in deferred compensation trust, weighted average cost per share (in dollars per share) | $36.94 | $35.25 |
IPL [Member] | ' | ' |
Common stock, par value | $2.50 | $2.50 |
Common stock, shares authorized (in shares) | 24,000,000 | 24,000,000 |
Common stock, shares outstanding (in shares) | 13,370,788 | 13,370,788 |
WPL [Member] | ' | ' |
Common stock, par value | $5 | $5 |
Common stock, shares authorized (in shares) | 18,000,000 | 18,000,000 |
Common stock, shares outstanding (in shares) | 13,236,601 | 13,236,601 |
Condensed_Consolidated_Stateme1
Condensed Consolidated Statements Of Cash Flows (USD $) | 9 Months Ended | |
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 |
Cash flows from operating activities: | ' | ' |
Net income | $330.80 | $308.10 |
Adjustments to reconcile net income to net cash flows from operating activities: | ' | ' |
Depreciation and amortization | 288.4 | 277.4 |
Other amortizations | 41.9 | 29.1 |
Deferred taxes and investment tax credits | 54.2 | 92.2 |
Equity income from unconsolidated investments, net | -34.2 | -32.7 |
Distributions from equity method investments | 27.2 | 26.6 |
Other | -21.3 | -14.1 |
Other changes in assets and liabilities: | ' | ' |
Accounts receivable | 96.1 | -2.8 |
Regulatory assets | -154.3 | -14.4 |
Regulatory liabilities | 61.1 | -74.9 |
Deferred income taxes | 109.5 | 75.4 |
Other | -35.5 | -26.8 |
Net cash flows from operating activities | 763.9 | 643.1 |
Cash flows used for investing activities: | ' | ' |
Utility construction and acquisition expenditures | -587.4 | -524.4 |
Alliant Energy Corporate Services, Inc. and non-regulated businesses construction and acquisition expenditures | -45.1 | -35.9 |
Proceeds from Franklin County wind project cash grant | 0 | 62.4 |
Other | -7.9 | -15.3 |
Net cash flows used for investing activities | -640.4 | -513.2 |
Cash flows from (used for) financing activities: | ' | ' |
Common stock dividends | -169.3 | -156.2 |
Preferred dividends paid by subsidiaries | -7.7 | -8.9 |
Payments to redeem cumulative preferred stock | 0 | -211 |
Proceeds from issuance of cumulative preferred stock | 0 | 200 |
Payments to retire long-term debt | -47.7 | -0.8 |
Net change in commercial paper | 74.4 | 34.8 |
Other | 28 | 8.7 |
Net cash flows from (used for) financing activities | -122.3 | -133.4 |
Net increase (decrease) in cash and cash equivalents | 1.2 | -3.5 |
Cash and cash equivalents at beginning of period | 9.8 | 21.2 |
Cash and cash equivalents at end of period | 11 | 17.7 |
Supplemental cash flows information: | ' | ' |
Interest, net of capitalized interest | 131.8 | 128.5 |
Income taxes, net of refunds | -5.3 | -9.7 |
Significant non-cash investing and financing activities: | ' | ' |
Accrued capital expenditures | 141.1 | 100.5 |
IPL [Member] | ' | ' |
Cash flows from operating activities: | ' | ' |
Net income | 172 | 168.8 |
Adjustments to reconcile net income to net cash flows from operating activities: | ' | ' |
Depreciation and amortization | 146.9 | 142.8 |
Other | -12.8 | 1.2 |
Other changes in assets and liabilities: | ' | ' |
Accounts receivable | 66.1 | -43 |
Regulatory assets | -126.1 | -9.8 |
Regulatory liabilities | 14.8 | -68.3 |
Deferred income taxes | 112.5 | 71 |
Other | 0.2 | -3 |
Net cash flows from operating activities | 373.6 | 259.7 |
Cash flows used for investing activities: | ' | ' |
Utility construction and acquisition expenditures | -358.2 | -274.3 |
Other | -18.3 | -15.5 |
Net cash flows used for investing activities | -376.5 | -289.8 |
Cash flows from (used for) financing activities: | ' | ' |
Common stock dividends | -105 | -95.7 |
Preferred dividends paid by subsidiaries | -7.7 | -8.3 |
Capital contributions from parent | 90 | 90 |
Payments to redeem cumulative preferred stock | 0 | -150 |
Proceeds from issuance of cumulative preferred stock | 0 | 200 |
Payments to retire long-term debt | -38.4 | 0 |
Net change in commercial paper | 38 | -11.3 |
Other | 26.2 | 7.2 |
Net cash flows from (used for) financing activities | 3.1 | 31.9 |
Net increase (decrease) in cash and cash equivalents | 0.2 | 1.8 |
Cash and cash equivalents at beginning of period | 4.4 | 4.5 |
Cash and cash equivalents at end of period | 4.6 | 6.3 |
Supplemental cash flows information: | ' | ' |
Interest, net of capitalized interest | 64.2 | 60.9 |
Income taxes, net of refunds | -21 | 10.7 |
Significant non-cash investing and financing activities: | ' | ' |
Accrued capital expenditures | 96.7 | 57.4 |
WPL [Member] | ' | ' |
Cash flows from operating activities: | ' | ' |
Net income | 151 | 139.3 |
Adjustments to reconcile net income to net cash flows from operating activities: | ' | ' |
Depreciation and amortization | 135 | 129 |
Other amortizations | 36.1 | 21.9 |
Deferred taxes and investment tax credits | 58.4 | 71.6 |
Equity income from unconsolidated investments, net | -34.2 | -32.7 |
Distributions from equity method investments | 27.2 | 26.6 |
Other | -7.3 | -5.4 |
Other changes in assets and liabilities: | ' | ' |
Accounts receivable | 27.8 | 28 |
Regulatory assets | -28.2 | -4.6 |
Derivative assets | -32.8 | 3.4 |
Regulatory liabilities | 46.3 | -6.6 |
Other | -13.5 | -14.3 |
Net cash flows from operating activities | 365.8 | 356.2 |
Cash flows used for investing activities: | ' | ' |
Utility construction and acquisition expenditures | -229.2 | -250.1 |
Other | -4.6 | -2.3 |
Net cash flows used for investing activities | -233.8 | -252.4 |
Cash flows from (used for) financing activities: | ' | ' |
Common stock dividends | -89.1 | -87.2 |
Payments to redeem cumulative preferred stock | 0 | -61 |
Net change in commercial paper | -37 | 56.8 |
Other | -4.1 | -6.5 |
Net cash flows from (used for) financing activities | -130.2 | -97.9 |
Net increase (decrease) in cash and cash equivalents | 1.8 | 5.9 |
Cash and cash equivalents at beginning of period | 0.5 | 0.7 |
Cash and cash equivalents at end of period | 2.3 | 6.6 |
Supplemental cash flows information: | ' | ' |
Interest, net of capitalized interest | 65.6 | 65.9 |
Income taxes, net of refunds | 8.7 | -0.6 |
Significant non-cash investing and financing activities: | ' | ' |
Accrued capital expenditures | $39.90 | $39.20 |
Summary_Of_Significant_Account
Summary Of Significant Accounting Policies | 9 Months Ended |
Sep. 30, 2014 | |
Summary Of Significant Accounting Policies | ' |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | |
(a) General - The interim unaudited Financial Statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, although management believes that the disclosures are adequate to make the information presented not misleading. These Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the latest combined Annual Report on Form 10-K. | |
In the opinion of management, all adjustments, which unless otherwise noted are normal and recurring in nature, necessary for a fair presentation of the results of operations, financial position and cash flows have been made. Results for the nine months ended September 30, 2014 are not necessarily indicative of results that may be expected for the year ending December 31, 2014. A change in management’s estimates or assumptions could have a material impact on financial condition and results of operations during the period in which such change occurred. Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes. Unless otherwise noted, the Notes herein exclude discontinued operations for all periods presented. | |
(b) New Accounting Pronouncements - | |
Revenue Recognition - In May 2014, FASB issued an accounting standard providing principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard also requires disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Alliant Energy, IPL and WPL are required to adopt this standard on January 1, 2017 and are currently evaluating the impact on their financial condition and results of operations. | |
Discontinued Operations - In April 2014, FASB issued an accounting standard that changes the criteria for reporting and qualifying for discontinued operations. Under the new standard, a disposal of a component or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operational and financial results. The new standard also requires additional disclosures about discontinued operations and individually significant components of an entity that are disposed of or that are classified as held for sale and do not qualify for discontinued operations. Alliant Energy, IPL and WPL are required to apply the new standard to all prospective disposals subsequent to December 31, 2014. Alliant Energy and IPL are currently evaluating the impact of the new standard on IPL’s anticipated sales of its Minnesota electric and natural gas distribution assets. Early adoption is permitted for disposals that have not been previously classified as held for sale. | |
IPL [Member] | ' |
Summary Of Significant Accounting Policies | ' |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | |
(a) General - The interim unaudited Financial Statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, although management believes that the disclosures are adequate to make the information presented not misleading. These Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the latest combined Annual Report on Form 10-K. | |
In the opinion of management, all adjustments, which unless otherwise noted are normal and recurring in nature, necessary for a fair presentation of the results of operations, financial position and cash flows have been made. Results for the nine months ended September 30, 2014 are not necessarily indicative of results that may be expected for the year ending December 31, 2014. A change in management’s estimates or assumptions could have a material impact on financial condition and results of operations during the period in which such change occurred. Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes. Unless otherwise noted, the Notes herein exclude discontinued operations for all periods presented. | |
(b) New Accounting Pronouncements - | |
Revenue Recognition - In May 2014, FASB issued an accounting standard providing principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard also requires disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Alliant Energy, IPL and WPL are required to adopt this standard on January 1, 2017 and are currently evaluating the impact on their financial condition and results of operations. | |
Discontinued Operations - In April 2014, FASB issued an accounting standard that changes the criteria for reporting and qualifying for discontinued operations. Under the new standard, a disposal of a component or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operational and financial results. The new standard also requires additional disclosures about discontinued operations and individually significant components of an entity that are disposed of or that are classified as held for sale and do not qualify for discontinued operations. Alliant Energy, IPL and WPL are required to apply the new standard to all prospective disposals subsequent to December 31, 2014. Alliant Energy and IPL are currently evaluating the impact of the new standard on IPL’s anticipated sales of its Minnesota electric and natural gas distribution assets. Early adoption is permitted for disposals that have not been previously classified as held for sale. | |
WPL [Member] | ' |
Summary Of Significant Accounting Policies | ' |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | |
(a) General - The interim unaudited Financial Statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, although management believes that the disclosures are adequate to make the information presented not misleading. These Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the latest combined Annual Report on Form 10-K. | |
In the opinion of management, all adjustments, which unless otherwise noted are normal and recurring in nature, necessary for a fair presentation of the results of operations, financial position and cash flows have been made. Results for the nine months ended September 30, 2014 are not necessarily indicative of results that may be expected for the year ending December 31, 2014. A change in management’s estimates or assumptions could have a material impact on financial condition and results of operations during the period in which such change occurred. Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes. Unless otherwise noted, the Notes herein exclude discontinued operations for all periods presented. | |
(b) New Accounting Pronouncements - | |
Revenue Recognition - In May 2014, FASB issued an accounting standard providing principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard also requires disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Alliant Energy, IPL and WPL are required to adopt this standard on January 1, 2017 and are currently evaluating the impact on their financial condition and results of operations. | |
Discontinued Operations - In April 2014, FASB issued an accounting standard that changes the criteria for reporting and qualifying for discontinued operations. Under the new standard, a disposal of a component or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operational and financial results. The new standard also requires additional disclosures about discontinued operations and individually significant components of an entity that are disposed of or that are classified as held for sale and do not qualify for discontinued operations. Alliant Energy, IPL and WPL are required to apply the new standard to all prospective disposals subsequent to December 31, 2014. Alliant Energy and IPL are currently evaluating the impact of the new standard on IPL’s anticipated sales of its Minnesota electric and natural gas distribution assets. Early adoption is permitted for disposals that have not been previously classified as held for sale. |
Regulatory_Matters
Regulatory Matters | 9 Months Ended | |||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||
Regulatory Matters [Line Items] | ' | |||||||||||||||||||||||
Regulatory Matters | ' | |||||||||||||||||||||||
REGULATORY MATTERS | ||||||||||||||||||||||||
Regulatory Assets and Regulatory Liabilities - | ||||||||||||||||||||||||
Regulatory assets were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Tax-related | $937.60 | $829.70 | $910.60 | $798.60 | $27.00 | $31.10 | ||||||||||||||||||
Pension and OPEB costs | 345.4 | 355.3 | 170.2 | 174.2 | 175.2 | 181.1 | ||||||||||||||||||
AROs | 74.6 | 65.7 | 43.1 | 36.7 | 31.5 | 29 | ||||||||||||||||||
Emission allowances | 28 | 30 | 28 | 30 | — | — | ||||||||||||||||||
Environmental-related costs | 26.6 | 25 | 22 | 21 | 4.6 | 4 | ||||||||||||||||||
Derivatives | 23.3 | 21.1 | 17.7 | 5.9 | 5.6 | 15.2 | ||||||||||||||||||
Other | 88.8 | 86.4 | 35.2 | 47.1 | 53.6 | 39.3 | ||||||||||||||||||
$1,524.30 | $1,413.20 | $1,226.80 | $1,113.50 | $297.50 | $299.70 | |||||||||||||||||||
Regulatory liabilities were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Cost of removal obligations | $422.70 | $418.90 | $280.90 | $277.70 | $141.80 | $141.20 | ||||||||||||||||||
IPL’s tax benefit riders | 266.3 | 265.4 | 266.3 | 265.4 | — | — | ||||||||||||||||||
Energy efficiency cost recovery | 67.5 | 52.7 | 8.6 | 9.3 | 58.9 | 43.4 | ||||||||||||||||||
Derivatives | 41.2 | 7.2 | 8.4 | 3.6 | 32.8 | 3.6 | ||||||||||||||||||
IPL’s electric transmission cost recovery | 14.1 | 14.6 | 14.1 | 14.6 | — | — | ||||||||||||||||||
IPL’s electric transmission assets sale | 13.7 | 21.6 | 13.7 | 21.6 | — | — | ||||||||||||||||||
Other | 51.3 | 41.1 | 31.2 | 22.7 | 20.1 | 18.4 | ||||||||||||||||||
$876.80 | $821.50 | $623.20 | $614.90 | $253.60 | $206.60 | |||||||||||||||||||
Tax-related - Alliant Energy’s and IPL’s tax-related regulatory assets are generally impacted by certain property-related differences at IPL for which deferred tax is not recorded in the income statement pursuant to Iowa rate-making principles. Deferred tax amounts for such property-related differences at IPL are recorded to regulatory assets, along with the necessary revenue requirement tax gross-ups. During the nine months ended September 30, 2014, Alliant Energy’s and IPL’s tax-related regulatory assets increased primarily due to property-related differences for qualifying repair expenditures and tax accounting method changes in 2014 for cost of removal expenditures and generation repair expenditures at IPL. The increase related to the tax accounting method changes was offset by increased regulatory liabilities as discussed below in “IPL’s tax benefit riders.” | ||||||||||||||||||||||||
Derivatives - Refer to Note 13 for discussion of derivative assets and derivative liabilities. | ||||||||||||||||||||||||
IPL’s tax benefit riders - IPL’s tax benefit riders utilize regulatory liabilities to credit bills of IPL’s Iowa retail electric and gas customers to help offset the impact of rate increases on such customers. These regulatory liabilities are related to tax benefits from tax accounting method changes for repairs expenditures, allocation of mixed service costs and allocation of insurance proceeds from floods in 2008. For the nine months ended September 30, 2014, Alliant Energy and IPL utilized “IPL’s tax benefit riders” regulatory liabilities to credit IPL’s Iowa retail electric and gas customers’ bills as follows (in millions): | ||||||||||||||||||||||||
Electric tax benefit rider | $64 | |||||||||||||||||||||||
Gas tax benefit rider | 9 | |||||||||||||||||||||||
$73 | ||||||||||||||||||||||||
In 2013, the U.S. Department of the Treasury issued tangible property regulations clarifying the tax treatment of costs incurred to acquire, maintain or improve tangible property and to retire and remove depreciable property. The regulations clarified the ability to deduct cost of removal expenditures on partial dispositions of assets. In 2014, the IRS issued implementation guidance related to these tangible property regulations, which allowed companies to file a tax accounting method change to deduct cost of removal expenditures on partial dispositions that were previously capitalized. During the second quarter of 2014, Alliant Energy, IPL and WPL implemented this tax accounting method change, which will result in the inclusion of additional tax deductions on Alliant Energy’s U.S. federal income tax return for the calendar year 2014. In 2013, the IRS also issued guidance that clarified acceptable units of property to be used when assessing whether costs incurred for electric generation projects may be deducted as repair expenditures or if they must be capitalized. After assessing the guidance, Alliant Energy, IPL and WPL decided in the third quarter of 2014 to implement the new units of property by filing a tax accounting method change as part of Alliant Energy’s U.S. federal income tax return for the calendar year 2013. IPL currently anticipates crediting its related tax benefits from these two tax accounting method changes to its Iowa retail electric and gas customers in the future, and as a result, Alliant Energy and IPL recorded an increase of $74 million to IPL’s tax benefit riders regulatory liabilities and IPL’s tax-related regulatory assets during the nine months ended September 30, 2014. | ||||||||||||||||||||||||
Refer to Note 9 for additional details regarding the tax benefit riders. | ||||||||||||||||||||||||
Utility Rate Cases - | ||||||||||||||||||||||||
WPL’s Wisconsin Retail Electric and Gas Rate Case (2015/2016 Test Period) - In July 2014, WPL received an order from the PSCW authorizing WPL to implement its retail base rate filing as requested. The order is based on a forward-looking test period that includes 2015 and 2016 and authorizes WPL to maintain customer base rates for its retail electric customers at their current levels through the end of 2016. The retail electric base rate case included a return of and a return on costs for emission controls projects at Columbia Units 1 and 2 and Edgewater Unit 5, generation performance and reliability improvements at Columbia Units 1 and 2, other ongoing capital expenditures, and an increase in electric transmission service expense. The additional revenue requirement for these cost increases was offset by the impact of changes in the amortization of regulatory liabilities associated with energy efficiency cost recoveries and increased sales volumes. The order also authorizes WPL to implement a $5 million decrease in annual base rates for its retail gas customers effective January 1, 2015 followed by a freeze of such gas base rates through the end of 2016. | ||||||||||||||||||||||||
IPL’s Iowa Retail Electric Rate Case (2013 Test Year) - In September 2014, the IUB approved IPL’s settlement agreement as requested. The settlement agreement extends IPL’s Iowa retail electric base rate freeze through 2016 and provides retail electric customer billing credits of $105 million in aggregate, including targeting $70 million in 2014 (beginning May 2014), $25 million in 2015 and $10 million in 2016. For the three and nine months ended September 30, 2014, IPL recorded $26 million and $46 million, respectively, of such billing credits to reduce retail electric customers’ bills. | ||||||||||||||||||||||||
IPL’s Iowa Retail Electric Rate Case (2009 Test Year) - | ||||||||||||||||||||||||
Electric Tax Benefit Rider - In 2013, the IUB authorized IPL to reduce the electric tax benefit rider billing credits on customers’ bills by $24 million in 2013 and $15 million in 2014 to recognize the revenue requirement impact of the changes in tax accounting methods. For the three and nine months ended September 30, the revenue requirement adjustment recognized by both Alliant Energy and IPL is included in the table below (in millions). The revenue requirement adjustment resulted in increases to electric revenues in their income statements and was recognized through the energy adjustment clause as a reduction of the credits on IPL’s Iowa retail electric customers’ bills from the electric tax benefit rider. | ||||||||||||||||||||||||
Three Months | Nine Months | |||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||
Revenue requirement adjustment | $4 | $7 | $11 | $18 | ||||||||||||||||||||
WPL’s Retail Fuel-related Rate Filing (2015 Test Year) - In June 2014, WPL filed a request with the PSCW to increase annual rates for WPL’s retail electric customers by $55 million, or approximately 5%, in 2015. The increase includes $41 million of anticipated increases in the retail share of electric fuel-related costs in 2015 attributable to $28 million for higher retail electric fuel-related costs per MWh anticipated in 2015 and $13 million from the impact of increased sales volumes approved in the retail electric base rate case for 2015. In addition, WPL’s request includes $14 million to recover a portion of the under-collection of fuel-related costs projected for 2014. Any rate changes granted from this request are expected to be effective on January 1, 2015. WPL currently expects a decision from the PSCW regarding this rate filing by the end of 2014. | ||||||||||||||||||||||||
WPL’s Retail Fuel-related Rate Filing (2014 Test Year) - In December 2013, WPL received an order from the PSCW authorizing an annual retail electric rate increase of $19 million, or approximately 2%, effective January 1, 2014 to reflect anticipated increases in retail fuel-related costs in 2014 compared to the fuel-related cost estimates used to determine rates for 2013. WPL’s 2014 fuel-related costs will be subject to deferral if they fall outside an annual bandwidth of plus or minus 2% of the approved annual forecasted fuel-related costs. Retail fuel-related costs incurred by WPL through September 30, 2014 were higher than fuel-related costs used to determine rates for such period resulting in an under-collection of fuel-related costs during the nine months ended September 30, 2014. As of September 30, 2014, Alliant Energy and WPL recorded $21 million in “Regulatory assets” on their balance sheets for fuel-related costs incurred during the nine months ended September 30, 2014 that are expected to fall outside the approved bandwidth of plus or minus 2% for 2014. The $21 million of deferred fuel-related costs is included in “Other” in Alliant Energy’s and WPL’s regulatory assets tables above. | ||||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||
Regulatory Matters [Line Items] | ' | |||||||||||||||||||||||
Regulatory Matters | ' | |||||||||||||||||||||||
REGULATORY MATTERS | ||||||||||||||||||||||||
Regulatory Assets and Regulatory Liabilities - | ||||||||||||||||||||||||
Regulatory assets were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Tax-related | $937.60 | $829.70 | $910.60 | $798.60 | $27.00 | $31.10 | ||||||||||||||||||
Pension and OPEB costs | 345.4 | 355.3 | 170.2 | 174.2 | 175.2 | 181.1 | ||||||||||||||||||
AROs | 74.6 | 65.7 | 43.1 | 36.7 | 31.5 | 29 | ||||||||||||||||||
Emission allowances | 28 | 30 | 28 | 30 | — | — | ||||||||||||||||||
Environmental-related costs | 26.6 | 25 | 22 | 21 | 4.6 | 4 | ||||||||||||||||||
Derivatives | 23.3 | 21.1 | 17.7 | 5.9 | 5.6 | 15.2 | ||||||||||||||||||
Other | 88.8 | 86.4 | 35.2 | 47.1 | 53.6 | 39.3 | ||||||||||||||||||
$1,524.30 | $1,413.20 | $1,226.80 | $1,113.50 | $297.50 | $299.70 | |||||||||||||||||||
Regulatory liabilities were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Cost of removal obligations | $422.70 | $418.90 | $280.90 | $277.70 | $141.80 | $141.20 | ||||||||||||||||||
IPL’s tax benefit riders | 266.3 | 265.4 | 266.3 | 265.4 | — | — | ||||||||||||||||||
Energy efficiency cost recovery | 67.5 | 52.7 | 8.6 | 9.3 | 58.9 | 43.4 | ||||||||||||||||||
Derivatives | 41.2 | 7.2 | 8.4 | 3.6 | 32.8 | 3.6 | ||||||||||||||||||
IPL’s electric transmission cost recovery | 14.1 | 14.6 | 14.1 | 14.6 | — | — | ||||||||||||||||||
IPL’s electric transmission assets sale | 13.7 | 21.6 | 13.7 | 21.6 | — | — | ||||||||||||||||||
Other | 51.3 | 41.1 | 31.2 | 22.7 | 20.1 | 18.4 | ||||||||||||||||||
$876.80 | $821.50 | $623.20 | $614.90 | $253.60 | $206.60 | |||||||||||||||||||
Tax-related - Alliant Energy’s and IPL’s tax-related regulatory assets are generally impacted by certain property-related differences at IPL for which deferred tax is not recorded in the income statement pursuant to Iowa rate-making principles. Deferred tax amounts for such property-related differences at IPL are recorded to regulatory assets, along with the necessary revenue requirement tax gross-ups. During the nine months ended September 30, 2014, Alliant Energy’s and IPL’s tax-related regulatory assets increased primarily due to property-related differences for qualifying repair expenditures and tax accounting method changes in 2014 for cost of removal expenditures and generation repair expenditures at IPL. The increase related to the tax accounting method changes was offset by increased regulatory liabilities as discussed below in “IPL’s tax benefit riders.” | ||||||||||||||||||||||||
Derivatives - Refer to Note 13 for discussion of derivative assets and derivative liabilities. | ||||||||||||||||||||||||
IPL’s tax benefit riders - IPL’s tax benefit riders utilize regulatory liabilities to credit bills of IPL’s Iowa retail electric and gas customers to help offset the impact of rate increases on such customers. These regulatory liabilities are related to tax benefits from tax accounting method changes for repairs expenditures, allocation of mixed service costs and allocation of insurance proceeds from floods in 2008. For the nine months ended September 30, 2014, Alliant Energy and IPL utilized “IPL’s tax benefit riders” regulatory liabilities to credit IPL’s Iowa retail electric and gas customers’ bills as follows (in millions): | ||||||||||||||||||||||||
Electric tax benefit rider | $64 | |||||||||||||||||||||||
Gas tax benefit rider | 9 | |||||||||||||||||||||||
$73 | ||||||||||||||||||||||||
In 2013, the U.S. Department of the Treasury issued tangible property regulations clarifying the tax treatment of costs incurred to acquire, maintain or improve tangible property and to retire and remove depreciable property. The regulations clarified the ability to deduct cost of removal expenditures on partial dispositions of assets. In 2014, the IRS issued implementation guidance related to these tangible property regulations, which allowed companies to file a tax accounting method change to deduct cost of removal expenditures on partial dispositions that were previously capitalized. During the second quarter of 2014, Alliant Energy, IPL and WPL implemented this tax accounting method change, which will result in the inclusion of additional tax deductions on Alliant Energy’s U.S. federal income tax return for the calendar year 2014. In 2013, the IRS also issued guidance that clarified acceptable units of property to be used when assessing whether costs incurred for electric generation projects may be deducted as repair expenditures or if they must be capitalized. After assessing the guidance, Alliant Energy, IPL and WPL decided in the third quarter of 2014 to implement the new units of property by filing a tax accounting method change as part of Alliant Energy’s U.S. federal income tax return for the calendar year 2013. IPL currently anticipates crediting its related tax benefits from these two tax accounting method changes to its Iowa retail electric and gas customers in the future, and as a result, Alliant Energy and IPL recorded an increase of $74 million to IPL’s tax benefit riders regulatory liabilities and IPL’s tax-related regulatory assets during the nine months ended September 30, 2014. | ||||||||||||||||||||||||
Refer to Note 9 for additional details regarding the tax benefit riders. | ||||||||||||||||||||||||
Utility Rate Cases - | ||||||||||||||||||||||||
WPL’s Wisconsin Retail Electric and Gas Rate Case (2015/2016 Test Period) - In July 2014, WPL received an order from the PSCW authorizing WPL to implement its retail base rate filing as requested. The order is based on a forward-looking test period that includes 2015 and 2016 and authorizes WPL to maintain customer base rates for its retail electric customers at their current levels through the end of 2016. The retail electric base rate case included a return of and a return on costs for emission controls projects at Columbia Units 1 and 2 and Edgewater Unit 5, generation performance and reliability improvements at Columbia Units 1 and 2, other ongoing capital expenditures, and an increase in electric transmission service expense. The additional revenue requirement for these cost increases was offset by the impact of changes in the amortization of regulatory liabilities associated with energy efficiency cost recoveries and increased sales volumes. The order also authorizes WPL to implement a $5 million decrease in annual base rates for its retail gas customers effective January 1, 2015 followed by a freeze of such gas base rates through the end of 2016. | ||||||||||||||||||||||||
IPL’s Iowa Retail Electric Rate Case (2013 Test Year) - In September 2014, the IUB approved IPL’s settlement agreement as requested. The settlement agreement extends IPL’s Iowa retail electric base rate freeze through 2016 and provides retail electric customer billing credits of $105 million in aggregate, including targeting $70 million in 2014 (beginning May 2014), $25 million in 2015 and $10 million in 2016. For the three and nine months ended September 30, 2014, IPL recorded $26 million and $46 million, respectively, of such billing credits to reduce retail electric customers’ bills. | ||||||||||||||||||||||||
IPL’s Iowa Retail Electric Rate Case (2009 Test Year) - | ||||||||||||||||||||||||
Electric Tax Benefit Rider - In 2013, the IUB authorized IPL to reduce the electric tax benefit rider billing credits on customers’ bills by $24 million in 2013 and $15 million in 2014 to recognize the revenue requirement impact of the changes in tax accounting methods. For the three and nine months ended September 30, the revenue requirement adjustment recognized by both Alliant Energy and IPL is included in the table below (in millions). The revenue requirement adjustment resulted in increases to electric revenues in their income statements and was recognized through the energy adjustment clause as a reduction of the credits on IPL’s Iowa retail electric customers’ bills from the electric tax benefit rider. | ||||||||||||||||||||||||
Three Months | Nine Months | |||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||
Revenue requirement adjustment | $4 | $7 | $11 | $18 | ||||||||||||||||||||
WPL’s Retail Fuel-related Rate Filing (2015 Test Year) - In June 2014, WPL filed a request with the PSCW to increase annual rates for WPL’s retail electric customers by $55 million, or approximately 5%, in 2015. The increase includes $41 million of anticipated increases in the retail share of electric fuel-related costs in 2015 attributable to $28 million for higher retail electric fuel-related costs per MWh anticipated in 2015 and $13 million from the impact of increased sales volumes approved in the retail electric base rate case for 2015. In addition, WPL’s request includes $14 million to recover a portion of the under-collection of fuel-related costs projected for 2014. Any rate changes granted from this request are expected to be effective on January 1, 2015. WPL currently expects a decision from the PSCW regarding this rate filing by the end of 2014. | ||||||||||||||||||||||||
WPL’s Retail Fuel-related Rate Filing (2014 Test Year) - In December 2013, WPL received an order from the PSCW authorizing an annual retail electric rate increase of $19 million, or approximately 2%, effective January 1, 2014 to reflect anticipated increases in retail fuel-related costs in 2014 compared to the fuel-related cost estimates used to determine rates for 2013. WPL’s 2014 fuel-related costs will be subject to deferral if they fall outside an annual bandwidth of plus or minus 2% of the approved annual forecasted fuel-related costs. Retail fuel-related costs incurred by WPL through September 30, 2014 were higher than fuel-related costs used to determine rates for such period resulting in an under-collection of fuel-related costs during the nine months ended September 30, 2014. As of September 30, 2014, Alliant Energy and WPL recorded $21 million in “Regulatory assets” on their balance sheets for fuel-related costs incurred during the nine months ended September 30, 2014 that are expected to fall outside the approved bandwidth of plus or minus 2% for 2014. The $21 million of deferred fuel-related costs is included in “Other” in Alliant Energy’s and WPL’s regulatory assets tables above. | ||||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||
Regulatory Matters [Line Items] | ' | |||||||||||||||||||||||
Regulatory Matters | ' | |||||||||||||||||||||||
REGULATORY MATTERS | ||||||||||||||||||||||||
Regulatory Assets and Regulatory Liabilities - | ||||||||||||||||||||||||
Regulatory assets were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Tax-related | $937.60 | $829.70 | $910.60 | $798.60 | $27.00 | $31.10 | ||||||||||||||||||
Pension and OPEB costs | 345.4 | 355.3 | 170.2 | 174.2 | 175.2 | 181.1 | ||||||||||||||||||
AROs | 74.6 | 65.7 | 43.1 | 36.7 | 31.5 | 29 | ||||||||||||||||||
Emission allowances | 28 | 30 | 28 | 30 | — | — | ||||||||||||||||||
Environmental-related costs | 26.6 | 25 | 22 | 21 | 4.6 | 4 | ||||||||||||||||||
Derivatives | 23.3 | 21.1 | 17.7 | 5.9 | 5.6 | 15.2 | ||||||||||||||||||
Other | 88.8 | 86.4 | 35.2 | 47.1 | 53.6 | 39.3 | ||||||||||||||||||
$1,524.30 | $1,413.20 | $1,226.80 | $1,113.50 | $297.50 | $299.70 | |||||||||||||||||||
Regulatory liabilities were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Cost of removal obligations | $422.70 | $418.90 | $280.90 | $277.70 | $141.80 | $141.20 | ||||||||||||||||||
IPL’s tax benefit riders | 266.3 | 265.4 | 266.3 | 265.4 | — | — | ||||||||||||||||||
Energy efficiency cost recovery | 67.5 | 52.7 | 8.6 | 9.3 | 58.9 | 43.4 | ||||||||||||||||||
Derivatives | 41.2 | 7.2 | 8.4 | 3.6 | 32.8 | 3.6 | ||||||||||||||||||
IPL’s electric transmission cost recovery | 14.1 | 14.6 | 14.1 | 14.6 | — | — | ||||||||||||||||||
IPL’s electric transmission assets sale | 13.7 | 21.6 | 13.7 | 21.6 | — | — | ||||||||||||||||||
Other | 51.3 | 41.1 | 31.2 | 22.7 | 20.1 | 18.4 | ||||||||||||||||||
$876.80 | $821.50 | $623.20 | $614.90 | $253.60 | $206.60 | |||||||||||||||||||
Tax-related - Alliant Energy’s and IPL’s tax-related regulatory assets are generally impacted by certain property-related differences at IPL for which deferred tax is not recorded in the income statement pursuant to Iowa rate-making principles. Deferred tax amounts for such property-related differences at IPL are recorded to regulatory assets, along with the necessary revenue requirement tax gross-ups. During the nine months ended September 30, 2014, Alliant Energy’s and IPL’s tax-related regulatory assets increased primarily due to property-related differences for qualifying repair expenditures and tax accounting method changes in 2014 for cost of removal expenditures and generation repair expenditures at IPL. The increase related to the tax accounting method changes was offset by increased regulatory liabilities as discussed below in “IPL’s tax benefit riders.” | ||||||||||||||||||||||||
Derivatives - Refer to Note 13 for discussion of derivative assets and derivative liabilities. | ||||||||||||||||||||||||
IPL’s tax benefit riders - IPL’s tax benefit riders utilize regulatory liabilities to credit bills of IPL’s Iowa retail electric and gas customers to help offset the impact of rate increases on such customers. These regulatory liabilities are related to tax benefits from tax accounting method changes for repairs expenditures, allocation of mixed service costs and allocation of insurance proceeds from floods in 2008. For the nine months ended September 30, 2014, Alliant Energy and IPL utilized “IPL’s tax benefit riders” regulatory liabilities to credit IPL’s Iowa retail electric and gas customers’ bills as follows (in millions): | ||||||||||||||||||||||||
Electric tax benefit rider | $64 | |||||||||||||||||||||||
Gas tax benefit rider | 9 | |||||||||||||||||||||||
$73 | ||||||||||||||||||||||||
In 2013, the U.S. Department of the Treasury issued tangible property regulations clarifying the tax treatment of costs incurred to acquire, maintain or improve tangible property and to retire and remove depreciable property. The regulations clarified the ability to deduct cost of removal expenditures on partial dispositions of assets. In 2014, the IRS issued implementation guidance related to these tangible property regulations, which allowed companies to file a tax accounting method change to deduct cost of removal expenditures on partial dispositions that were previously capitalized. During the second quarter of 2014, Alliant Energy, IPL and WPL implemented this tax accounting method change, which will result in the inclusion of additional tax deductions on Alliant Energy’s U.S. federal income tax return for the calendar year 2014. In 2013, the IRS also issued guidance that clarified acceptable units of property to be used when assessing whether costs incurred for electric generation projects may be deducted as repair expenditures or if they must be capitalized. After assessing the guidance, Alliant Energy, IPL and WPL decided in the third quarter of 2014 to implement the new units of property by filing a tax accounting method change as part of Alliant Energy’s U.S. federal income tax return for the calendar year 2013. IPL currently anticipates crediting its related tax benefits from these two tax accounting method changes to its Iowa retail electric and gas customers in the future, and as a result, Alliant Energy and IPL recorded an increase of $74 million to IPL’s tax benefit riders regulatory liabilities and IPL’s tax-related regulatory assets during the nine months ended September 30, 2014. | ||||||||||||||||||||||||
Refer to Note 9 for additional details regarding the tax benefit riders. | ||||||||||||||||||||||||
Utility Rate Cases - | ||||||||||||||||||||||||
WPL’s Wisconsin Retail Electric and Gas Rate Case (2015/2016 Test Period) - In July 2014, WPL received an order from the PSCW authorizing WPL to implement its retail base rate filing as requested. The order is based on a forward-looking test period that includes 2015 and 2016 and authorizes WPL to maintain customer base rates for its retail electric customers at their current levels through the end of 2016. The retail electric base rate case included a return of and a return on costs for emission controls projects at Columbia Units 1 and 2 and Edgewater Unit 5, generation performance and reliability improvements at Columbia Units 1 and 2, other ongoing capital expenditures, and an increase in electric transmission service expense. The additional revenue requirement for these cost increases was offset by the impact of changes in the amortization of regulatory liabilities associated with energy efficiency cost recoveries and increased sales volumes. The order also authorizes WPL to implement a $5 million decrease in annual base rates for its retail gas customers effective January 1, 2015 followed by a freeze of such gas base rates through the end of 2016. | ||||||||||||||||||||||||
IPL’s Iowa Retail Electric Rate Case (2013 Test Year) - In September 2014, the IUB approved IPL’s settlement agreement as requested. The settlement agreement extends IPL’s Iowa retail electric base rate freeze through 2016 and provides retail electric customer billing credits of $105 million in aggregate, including targeting $70 million in 2014 (beginning May 2014), $25 million in 2015 and $10 million in 2016. For the three and nine months ended September 30, 2014, IPL recorded $26 million and $46 million, respectively, of such billing credits to reduce retail electric customers’ bills. | ||||||||||||||||||||||||
IPL’s Iowa Retail Electric Rate Case (2009 Test Year) - | ||||||||||||||||||||||||
Electric Tax Benefit Rider - In 2013, the IUB authorized IPL to reduce the electric tax benefit rider billing credits on customers’ bills by $24 million in 2013 and $15 million in 2014 to recognize the revenue requirement impact of the changes in tax accounting methods. For the three and nine months ended September 30, the revenue requirement adjustment recognized by both Alliant Energy and IPL is included in the table below (in millions). The revenue requirement adjustment resulted in increases to electric revenues in their income statements and was recognized through the energy adjustment clause as a reduction of the credits on IPL’s Iowa retail electric customers’ bills from the electric tax benefit rider. | ||||||||||||||||||||||||
Three Months | Nine Months | |||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||
Revenue requirement adjustment | $4 | $7 | $11 | $18 | ||||||||||||||||||||
WPL’s Retail Fuel-related Rate Filing (2015 Test Year) - In June 2014, WPL filed a request with the PSCW to increase annual rates for WPL’s retail electric customers by $55 million, or approximately 5%, in 2015. The increase includes $41 million of anticipated increases in the retail share of electric fuel-related costs in 2015 attributable to $28 million for higher retail electric fuel-related costs per MWh anticipated in 2015 and $13 million from the impact of increased sales volumes approved in the retail electric base rate case for 2015. In addition, WPL’s request includes $14 million to recover a portion of the under-collection of fuel-related costs projected for 2014. Any rate changes granted from this request are expected to be effective on January 1, 2015. WPL currently expects a decision from the PSCW regarding this rate filing by the end of 2014. | ||||||||||||||||||||||||
WPL’s Retail Fuel-related Rate Filing (2014 Test Year) - In December 2013, WPL received an order from the PSCW authorizing an annual retail electric rate increase of $19 million, or approximately 2%, effective January 1, 2014 to reflect anticipated increases in retail fuel-related costs in 2014 compared to the fuel-related cost estimates used to determine rates for 2013. WPL’s 2014 fuel-related costs will be subject to deferral if they fall outside an annual bandwidth of plus or minus 2% of the approved annual forecasted fuel-related costs. Retail fuel-related costs incurred by WPL through September 30, 2014 were higher than fuel-related costs used to determine rates for such period resulting in an under-collection of fuel-related costs during the nine months ended September 30, 2014. As of September 30, 2014, Alliant Energy and WPL recorded $21 million in “Regulatory assets” on their balance sheets for fuel-related costs incurred during the nine months ended September 30, 2014 that are expected to fall outside the approved bandwidth of plus or minus 2% for 2014. The $21 million of deferred fuel-related costs is included in “Other” in Alliant Energy’s and WPL’s regulatory assets tables above. |
Property_Plant_and_Equipment
Property, Plant and Equipment | 9 Months Ended |
Sep. 30, 2014 | |
Property, Plant and Equipment [Line Items] | ' |
Property, Plant and Equipment | ' |
PROPERTY, PLANT AND EQUIPMENT | |
Emission Controls Projects - | |
IPL’s George Neal Unit 3 - Construction of the scrubber and baghouse at George Neal Unit 3 was completed in May 2014, which resulted in a transfer of the capitalized project costs from “Construction work in progress” to “Electric plant” on Alliant Energy’s and IPL’s balance sheets in 2014. As of September 30, 2014, the capitalized project costs consisted of capital expenditures of $59 million and AFUDC of $4 million for IPL’s allocated portion of the George Neal Unit 3 scrubber and baghouse. | |
IPL’s Ottumwa Unit 1 - IPL is currently constructing a scrubber and baghouse at Ottumwa Unit 1 to reduce SO2 and mercury emissions at the EGU. Construction began in 2012 and is expected to be completed in 2014. As of September 30, 2014, Alliant Energy and IPL recorded capitalized expenditures of $151 million and AFUDC of $18 million for IPL’s allocated portion of the scrubber and baghouse in “Construction work in progress” on their balance sheets. | |
WPL’s Columbia Units 1 and 2 - Construction of the scrubbers and baghouses at Columbia Units 1 and 2 was completed in July 2014 and April 2014, respectively, which resulted in a transfer of the capitalized project costs from “Construction work in progress” to “Electric plant” on Alliant Energy’s and WPL’s balance sheets in 2014. As of September 30, 2014, the capitalized project costs consisted of capital expenditures of $272 million and AFUDC of $15 million for WPL’s allocated portion of the Columbia Units 1 and 2 scrubbers and baghouses. | |
WPL’s Edgewater Unit 5 - WPL is currently constructing a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions at the EGU. Construction began in 2014 and is expected to be completed in 2016. As of September 30, 2014, Alliant Energy and WPL recorded capitalized expenditures of $67 million and AFUDC of $2 million for the scrubber and baghouse in “Construction work in progress” on their balance sheets. | |
Natural Gas-Fired Generation Project - | |
IPL’s Marshalltown Generating Station - IPL is currently constructing Marshalltown, an approximate 650 MW natural gas-fired combined-cycle EGU. Construction began in 2014 and is expected to be completed in 2017. As of September 30, 2014, Alliant Energy and IPL recorded capitalized expenditures of $120 million and AFUDC of $2 million for Marshalltown in “Construction work in progress” on their balance sheets. | |
Anticipated Sale of IPL’s Minnesota Natural Gas Distribution Assets - In November 2014, the MPUC issued an oral decision approving the proposed sale of IPL’s Minnesota natural gas distribution assets. IPL currently expects to complete the sale by March 31, 2015 pending receipt of a final order from the MPUC and completion of various other contingencies. Proceeds from the sale of the natural gas distribution assets, which approximate the carrying value of such assets, are expected to be approximately $10 million, subject to customary closing adjustments. As of September 30, 2014, IPL’s assets and liabilities included in the sale agreement did not meet the criteria to be classified as held for sale due to uncertainties in the regulatory approval process that existed on such date. The operating results of IPL’s Minnesota natural gas distribution business also did not qualify as discontinued operations as of September 30, 2014. | |
IPL [Member] | ' |
Property, Plant and Equipment [Line Items] | ' |
Property, Plant and Equipment | ' |
PROPERTY, PLANT AND EQUIPMENT | |
Emission Controls Projects - | |
IPL’s George Neal Unit 3 - Construction of the scrubber and baghouse at George Neal Unit 3 was completed in May 2014, which resulted in a transfer of the capitalized project costs from “Construction work in progress” to “Electric plant” on Alliant Energy’s and IPL’s balance sheets in 2014. As of September 30, 2014, the capitalized project costs consisted of capital expenditures of $59 million and AFUDC of $4 million for IPL’s allocated portion of the George Neal Unit 3 scrubber and baghouse. | |
IPL’s Ottumwa Unit 1 - IPL is currently constructing a scrubber and baghouse at Ottumwa Unit 1 to reduce SO2 and mercury emissions at the EGU. Construction began in 2012 and is expected to be completed in 2014. As of September 30, 2014, Alliant Energy and IPL recorded capitalized expenditures of $151 million and AFUDC of $18 million for IPL’s allocated portion of the scrubber and baghouse in “Construction work in progress” on their balance sheets. | |
WPL’s Columbia Units 1 and 2 - Construction of the scrubbers and baghouses at Columbia Units 1 and 2 was completed in July 2014 and April 2014, respectively, which resulted in a transfer of the capitalized project costs from “Construction work in progress” to “Electric plant” on Alliant Energy’s and WPL’s balance sheets in 2014. As of September 30, 2014, the capitalized project costs consisted of capital expenditures of $272 million and AFUDC of $15 million for WPL’s allocated portion of the Columbia Units 1 and 2 scrubbers and baghouses. | |
WPL’s Edgewater Unit 5 - WPL is currently constructing a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions at the EGU. Construction began in 2014 and is expected to be completed in 2016. As of September 30, 2014, Alliant Energy and WPL recorded capitalized expenditures of $67 million and AFUDC of $2 million for the scrubber and baghouse in “Construction work in progress” on their balance sheets. | |
Natural Gas-Fired Generation Project - | |
IPL’s Marshalltown Generating Station - IPL is currently constructing Marshalltown, an approximate 650 MW natural gas-fired combined-cycle EGU. Construction began in 2014 and is expected to be completed in 2017. As of September 30, 2014, Alliant Energy and IPL recorded capitalized expenditures of $120 million and AFUDC of $2 million for Marshalltown in “Construction work in progress” on their balance sheets. | |
Anticipated Sale of IPL’s Minnesota Natural Gas Distribution Assets - In November 2014, the MPUC issued an oral decision approving the proposed sale of IPL’s Minnesota natural gas distribution assets. IPL currently expects to complete the sale by March 31, 2015 pending receipt of a final order from the MPUC and completion of various other contingencies. Proceeds from the sale of the natural gas distribution assets, which approximate the carrying value of such assets, are expected to be approximately $10 million, subject to customary closing adjustments. As of September 30, 2014, IPL’s assets and liabilities included in the sale agreement did not meet the criteria to be classified as held for sale due to uncertainties in the regulatory approval process that existed on such date. The operating results of IPL’s Minnesota natural gas distribution business also did not qualify as discontinued operations as of September 30, 2014. | |
WPL [Member] | ' |
Property, Plant and Equipment [Line Items] | ' |
Property, Plant and Equipment | ' |
PROPERTY, PLANT AND EQUIPMENT | |
Emission Controls Projects - | |
IPL’s George Neal Unit 3 - Construction of the scrubber and baghouse at George Neal Unit 3 was completed in May 2014, which resulted in a transfer of the capitalized project costs from “Construction work in progress” to “Electric plant” on Alliant Energy’s and IPL’s balance sheets in 2014. As of September 30, 2014, the capitalized project costs consisted of capital expenditures of $59 million and AFUDC of $4 million for IPL’s allocated portion of the George Neal Unit 3 scrubber and baghouse. | |
IPL’s Ottumwa Unit 1 - IPL is currently constructing a scrubber and baghouse at Ottumwa Unit 1 to reduce SO2 and mercury emissions at the EGU. Construction began in 2012 and is expected to be completed in 2014. As of September 30, 2014, Alliant Energy and IPL recorded capitalized expenditures of $151 million and AFUDC of $18 million for IPL’s allocated portion of the scrubber and baghouse in “Construction work in progress” on their balance sheets. | |
WPL’s Columbia Units 1 and 2 - Construction of the scrubbers and baghouses at Columbia Units 1 and 2 was completed in July 2014 and April 2014, respectively, which resulted in a transfer of the capitalized project costs from “Construction work in progress” to “Electric plant” on Alliant Energy’s and WPL’s balance sheets in 2014. As of September 30, 2014, the capitalized project costs consisted of capital expenditures of $272 million and AFUDC of $15 million for WPL’s allocated portion of the Columbia Units 1 and 2 scrubbers and baghouses. | |
WPL’s Edgewater Unit 5 - WPL is currently constructing a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions at the EGU. Construction began in 2014 and is expected to be completed in 2016. As of September 30, 2014, Alliant Energy and WPL recorded capitalized expenditures of $67 million and AFUDC of $2 million for the scrubber and baghouse in “Construction work in progress” on their balance sheets. | |
Natural Gas-Fired Generation Project - | |
IPL’s Marshalltown Generating Station - IPL is currently constructing Marshalltown, an approximate 650 MW natural gas-fired combined-cycle EGU. Construction began in 2014 and is expected to be completed in 2017. As of September 30, 2014, Alliant Energy and IPL recorded capitalized expenditures of $120 million and AFUDC of $2 million for Marshalltown in “Construction work in progress” on their balance sheets. | |
Anticipated Sale of IPL’s Minnesota Natural Gas Distribution Assets - In November 2014, the MPUC issued an oral decision approving the proposed sale of IPL’s Minnesota natural gas distribution assets. IPL currently expects to complete the sale by March 31, 2015 pending receipt of a final order from the MPUC and completion of various other contingencies. Proceeds from the sale of the natural gas distribution assets, which approximate the carrying value of such assets, are expected to be approximately $10 million, subject to customary closing adjustments. As of September 30, 2014, IPL’s assets and liabilities included in the sale agreement did not meet the criteria to be classified as held for sale due to uncertainties in the regulatory approval process that existed on such date. The operating results of IPL’s Minnesota natural gas distribution business also did not qualify as discontinued operations as of September 30, 2014. |
Receivables
Receivables | 9 Months Ended | |||||||||||||||
Sep. 30, 2014 | ||||||||||||||||
Receivables [Line Items] | ' | |||||||||||||||
Receivables | ' | |||||||||||||||
RECEIVABLES | ||||||||||||||||
(a) Sales of Accounts Receivable - IPL maintains a Receivables Agreement whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. In March 2014, IPL extended through March 2016 the purchase commitment from the third party to which it sells its receivables. In exchange for the receivables sold, cash proceeds are received from the third party, and deferred proceeds are recorded in accounts receivable on Alliant Energy’s and IPL’s balance sheets. | ||||||||||||||||
As of September 30, 2014 and December 31, 2013, IPL sold $203.7 million and $238.0 million aggregate amounts of receivables, respectively. Maximum and average outstanding cash proceeds, and costs incurred related to the sales of accounts receivable program for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||
Three Months | Nine Months | |||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances) | $92.00 | $155.00 | $92.00 | $170.00 | ||||||||||||
Average outstanding aggregate cash proceeds (based on daily outstanding balances) | 54.5 | 132.7 | 38.9 | 132.5 | ||||||||||||
Costs incurred | 0.2 | 0.3 | 0.6 | 1 | ||||||||||||
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions): | ||||||||||||||||
September 30, 2014 | December 31, 2013 | |||||||||||||||
Customer accounts receivable | $142.60 | $151.60 | ||||||||||||||
Unbilled utility revenues | 60.7 | 86.2 | ||||||||||||||
Other receivables | 0.4 | 0.2 | ||||||||||||||
Receivables sold | 203.7 | 238 | ||||||||||||||
Less: cash proceeds (a) | 38 | 29 | ||||||||||||||
Deferred proceeds | 165.7 | 209 | ||||||||||||||
Less: allowance for doubtful accounts | 5.4 | 5.5 | ||||||||||||||
Fair value of deferred proceeds | $160.30 | $203.50 | ||||||||||||||
Outstanding receivables past due | $17.80 | $21.50 | ||||||||||||||
(a) | Changes in cash proceeds are presented in “Accounts receivable” in operating activities in Alliant Energy’s and IPL’s cash flows statements. | |||||||||||||||
Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||
Three Months | Nine Months | |||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||
Collections reinvested in receivables | $520.10 | $481.10 | $1,537.30 | $1,407.40 | ||||||||||||
Credit losses, net of recoveries | 6.4 | 3.9 | 12.8 | 7.8 | ||||||||||||
(b) Whiting Petroleum Tax Sharing Agreement - Prior to an IPO of Whiting Petroleum in 2003, Alliant Energy and Whiting Petroleum entered into a tax separation and indemnification agreement pursuant to which Alliant Energy and Whiting Petroleum made certain tax elections. These tax elections had the effect of increasing the tax basis of the assets of Whiting Petroleum’s consolidated tax group based on the sales price of Whiting Petroleum’s shares in the IPO. The increase in the tax basis of the assets was included in income in Alliant Energy’s U.S. federal income tax return for the calendar year 2003. Pursuant to the tax separation and indemnification agreement, Whiting Petroleum paid Resources the final payment of $26 million in March 2014, which represented the present value of certain future tax benefits expected to be realized by Whiting Petroleum through future tax deductions. The final payment resulted in a decrease in “Prepayments and other” on Alliant Energy’s balance sheet in 2014. The $26 million received by Alliant Energy is presented in operating activities in its cash flows statement for the nine months ended September 30, 2014. | ||||||||||||||||
IPL [Member] | ' | |||||||||||||||
Receivables [Line Items] | ' | |||||||||||||||
Receivables | ' | |||||||||||||||
RECEIVABLES | ||||||||||||||||
(a) Sales of Accounts Receivable - IPL maintains a Receivables Agreement whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. In March 2014, IPL extended through March 2016 the purchase commitment from the third party to which it sells its receivables. In exchange for the receivables sold, cash proceeds are received from the third party, and deferred proceeds are recorded in accounts receivable on Alliant Energy’s and IPL’s balance sheets. | ||||||||||||||||
As of September 30, 2014 and December 31, 2013, IPL sold $203.7 million and $238.0 million aggregate amounts of receivables, respectively. Maximum and average outstanding cash proceeds, and costs incurred related to the sales of accounts receivable program for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||
Three Months | Nine Months | |||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances) | $92.00 | $155.00 | $92.00 | $170.00 | ||||||||||||
Average outstanding aggregate cash proceeds (based on daily outstanding balances) | 54.5 | 132.7 | 38.9 | 132.5 | ||||||||||||
Costs incurred | 0.2 | 0.3 | 0.6 | 1 | ||||||||||||
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions): | ||||||||||||||||
September 30, 2014 | December 31, 2013 | |||||||||||||||
Customer accounts receivable | $142.60 | $151.60 | ||||||||||||||
Unbilled utility revenues | 60.7 | 86.2 | ||||||||||||||
Other receivables | 0.4 | 0.2 | ||||||||||||||
Receivables sold | 203.7 | 238 | ||||||||||||||
Less: cash proceeds (a) | 38 | 29 | ||||||||||||||
Deferred proceeds | 165.7 | 209 | ||||||||||||||
Less: allowance for doubtful accounts | 5.4 | 5.5 | ||||||||||||||
Fair value of deferred proceeds | $160.30 | $203.50 | ||||||||||||||
Outstanding receivables past due | $17.80 | $21.50 | ||||||||||||||
(a) | Changes in cash proceeds are presented in “Accounts receivable” in operating activities in Alliant Energy’s and IPL’s cash flows statements. | |||||||||||||||
Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||
Three Months | Nine Months | |||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||
Collections reinvested in receivables | $520.10 | $481.10 | $1,537.30 | $1,407.40 | ||||||||||||
Credit losses, net of recoveries | 6.4 | 3.9 | 12.8 | 7.8 | ||||||||||||
Investments
Investments | 9 Months Ended | |||||||||||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||||||||||
Schedule of Investments [Line Items] | ' | |||||||||||||||||||||||||||||||
Investments | ' | |||||||||||||||||||||||||||||||
INVESTMENTS | ||||||||||||||||||||||||||||||||
Unconsolidated Equity Investments - Equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | WPL | |||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||
ATC | ($11.2 | ) | ($10.8 | ) | ($33.5 | ) | ($31.7 | ) | ($11.2 | ) | ($10.8 | ) | ($33.5 | ) | ($31.7 | ) | ||||||||||||||||
Other | (0.3 | ) | (0.3 | ) | (0.7 | ) | (1.0 | ) | (0.2 | ) | (0.3 | ) | (0.7 | ) | (1.0 | ) | ||||||||||||||||
($11.5 | ) | ($11.1 | ) | ($34.2 | ) | ($32.7 | ) | ($11.4 | ) | ($11.1 | ) | ($34.2 | ) | ($32.7 | ) | |||||||||||||||||
WPL’s Noncontrolling Interest - As of December 31, 2013, WPL, through its ownership interest in WPL Transco, held a 16% ownership interest in ATC. In January 2014, WPL Transco’s operating agreement was amended to allow ATI, a wholly-owned subsidiary of Resources, to become a member of WPL Transco in addition to WPL. In 2014, ATI began funding capital contributions that WPL Transco makes to ATC, and ATI is expected to continue to do so in the future. As of September 30, 2014, WPL’s noncontrolling interest reflects ATI’s ownership interest in WPL Transco, which was presented in total equity on WPL’s balance sheet. | ||||||||||||||||||||||||||||||||
As a result of ATI funding future capital contributions to ATC, WPL’s ownership interest in WPL Transco is expected to decrease over time and ATI’s ownership interest in WPL Transco is expected to increase over time. WPL Transco’s equity income from ATC and future ATC dividends received by WPL Transco will be allocated between WPL and ATI based on their respective ownership interests at the time the equity income is generated and at the time of the dividend payments. Alliant Energy’s aggregate ownership interest in ATC is not expected to change as a result of WPL Transco’s amended operating agreement. | ||||||||||||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||||||||||
Schedule of Investments [Line Items] | ' | |||||||||||||||||||||||||||||||
Investments | ' | |||||||||||||||||||||||||||||||
INVESTMENTS | ||||||||||||||||||||||||||||||||
Unconsolidated Equity Investments - Equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | WPL | |||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||
ATC | ($11.2 | ) | ($10.8 | ) | ($33.5 | ) | ($31.7 | ) | ($11.2 | ) | ($10.8 | ) | ($33.5 | ) | ($31.7 | ) | ||||||||||||||||
Other | (0.3 | ) | (0.3 | ) | (0.7 | ) | (1.0 | ) | (0.2 | ) | (0.3 | ) | (0.7 | ) | (1.0 | ) | ||||||||||||||||
($11.5 | ) | ($11.1 | ) | ($34.2 | ) | ($32.7 | ) | ($11.4 | ) | ($11.1 | ) | ($34.2 | ) | ($32.7 | ) | |||||||||||||||||
WPL’s Noncontrolling Interest - As of December 31, 2013, WPL, through its ownership interest in WPL Transco, held a 16% ownership interest in ATC. In January 2014, WPL Transco’s operating agreement was amended to allow ATI, a wholly-owned subsidiary of Resources, to become a member of WPL Transco in addition to WPL. In 2014, ATI began funding capital contributions that WPL Transco makes to ATC, and ATI is expected to continue to do so in the future. As of September 30, 2014, WPL’s noncontrolling interest reflects ATI’s ownership interest in WPL Transco, which was presented in total equity on WPL’s balance sheet. | ||||||||||||||||||||||||||||||||
As a result of ATI funding future capital contributions to ATC, WPL’s ownership interest in WPL Transco is expected to decrease over time and ATI’s ownership interest in WPL Transco is expected to increase over time. WPL Transco’s equity income from ATC and future ATC dividends received by WPL Transco will be allocated between WPL and ATI based on their respective ownership interests at the time the equity income is generated and at the time of the dividend payments. Alliant Energy’s aggregate ownership interest in ATC is not expected to change as a result of WPL Transco’s amended operating agreement. |
Common_Equity
Common Equity | 9 Months Ended | ||
Sep. 30, 2014 | |||
Common Equity [Line Items] | ' | ||
Common Equity | ' | ||
COMMON EQUITY | |||
Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows: | |||
Shares outstanding, January 1, 2014 | 110,943,669 | ||
Equity-based compensation plans (Note 10(b)) | 35,547 | ||
Other | (43,536 | ) | |
Shares outstanding, September 30, 2014 | 110,935,680 | ||
Dividend Restrictions - As of September 30, 2014, IPL’s amount of retained earnings that were free of dividend restrictions was $553 million. As of September 30, 2014, WPL’s amount of retained earnings that were free of dividend restrictions was $30 million for the remainder of 2014. | |||
Restricted Net Assets of Subsidiaries - As of September 30, 2014, the amount of net assets of IPL and WPL that were not available to be transferred to their parent company, Alliant Energy, in the form of loans, advances or cash dividends without the consent of IPL’s and WPL’s regulatory authorities was $1.3 billion and $1.7 billion, respectively. | |||
Capital Transactions with Subsidiaries - For the nine months ended September 30, 2014, IPL received capital contributions of $90.0 million from its parent company. For the nine months ended September 30, 2014, IPL and WPL each paid common stock dividends of $105.0 million and $89.1 million, respectively, to its parent company. | |||
Comprehensive Income - For the three and nine months ended September 30, 2014 and 2013, Alliant Energy had no other comprehensive income; therefore, its comprehensive income was equal to its net income and its comprehensive income attributable to Alliant Energy common shareowners was equal to its net income attributable to Alliant Energy common shareowners for such periods. For the three and nine months ended September 30, 2014 and 2013, IPL and WPL had no other comprehensive income; therefore, their comprehensive income was equal to their net income and their comprehensive income available for common stock was equal to their earnings available for common stock for such periods. | |||
IPL [Member] | ' | ||
Common Equity [Line Items] | ' | ||
Common Equity | ' | ||
COMMON EQUITY | |||
Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows: | |||
Shares outstanding, January 1, 2014 | 110,943,669 | ||
Equity-based compensation plans (Note 10(b)) | 35,547 | ||
Other | (43,536 | ) | |
Shares outstanding, September 30, 2014 | 110,935,680 | ||
Dividend Restrictions - As of September 30, 2014, IPL’s amount of retained earnings that were free of dividend restrictions was $553 million. As of September 30, 2014, WPL’s amount of retained earnings that were free of dividend restrictions was $30 million for the remainder of 2014. | |||
Restricted Net Assets of Subsidiaries - As of September 30, 2014, the amount of net assets of IPL and WPL that were not available to be transferred to their parent company, Alliant Energy, in the form of loans, advances or cash dividends without the consent of IPL’s and WPL’s regulatory authorities was $1.3 billion and $1.7 billion, respectively. | |||
Capital Transactions with Subsidiaries - For the nine months ended September 30, 2014, IPL received capital contributions of $90.0 million from its parent company. For the nine months ended September 30, 2014, IPL and WPL each paid common stock dividends of $105.0 million and $89.1 million, respectively, to its parent company. | |||
Comprehensive Income - For the three and nine months ended September 30, 2014 and 2013, Alliant Energy had no other comprehensive income; therefore, its comprehensive income was equal to its net income and its comprehensive income attributable to Alliant Energy common shareowners was equal to its net income attributable to Alliant Energy common shareowners for such periods. For the three and nine months ended September 30, 2014 and 2013, IPL and WPL had no other comprehensive income; therefore, their comprehensive income was equal to their net income and their comprehensive income available for common stock was equal to their earnings available for common stock for such periods. | |||
WPL [Member] | ' | ||
Common Equity [Line Items] | ' | ||
Common Equity | ' | ||
COMMON EQUITY | |||
Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows: | |||
Shares outstanding, January 1, 2014 | 110,943,669 | ||
Equity-based compensation plans (Note 10(b)) | 35,547 | ||
Other | (43,536 | ) | |
Shares outstanding, September 30, 2014 | 110,935,680 | ||
Dividend Restrictions - As of September 30, 2014, IPL’s amount of retained earnings that were free of dividend restrictions was $553 million. As of September 30, 2014, WPL’s amount of retained earnings that were free of dividend restrictions was $30 million for the remainder of 2014. | |||
Restricted Net Assets of Subsidiaries - As of September 30, 2014, the amount of net assets of IPL and WPL that were not available to be transferred to their parent company, Alliant Energy, in the form of loans, advances or cash dividends without the consent of IPL’s and WPL’s regulatory authorities was $1.3 billion and $1.7 billion, respectively. | |||
Capital Transactions with Subsidiaries - For the nine months ended September 30, 2014, IPL received capital contributions of $90.0 million from its parent company. For the nine months ended September 30, 2014, IPL and WPL each paid common stock dividends of $105.0 million and $89.1 million, respectively, to its parent company. | |||
Comprehensive Income - For the three and nine months ended September 30, 2014 and 2013, Alliant Energy had no other comprehensive income; therefore, its comprehensive income was equal to its net income and its comprehensive income attributable to Alliant Energy common shareowners was equal to its net income attributable to Alliant Energy common shareowners for such periods. For the three and nine months ended September 30, 2014 and 2013, IPL and WPL had no other comprehensive income; therefore, their comprehensive income was equal to their net income and their comprehensive income available for common stock was equal to their earnings available for common stock for such periods. |
Redeemable_Preferred_Stock
Redeemable Preferred Stock | 9 Months Ended |
Sep. 30, 2014 | |
Redeemable Preferred Stock | ' |
REDEEMABLE PREFERRED STOCK | |
IPL - In March 2013, IPL redeemed all 6,000,000 outstanding shares of its 8.375% cumulative preferred stock for $150 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and IPL recorded a $5 million charge during the nine months ended September 30, 2013 related to this transaction in “Preferred dividend requirements” in their income statements. | |
WPL - In March 2013, WPL redeemed all 1,049,225 outstanding shares of its 4.40% through 6.50% cumulative preferred stock for $61 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and WPL recorded a $1 million charge during the nine months ended September 30, 2013 related to this transaction in “Preferred dividend requirements” in their income statements. | |
Refer to Note 12 for information on the fair value of cumulative preferred stock. | |
IPL [Member] | ' |
Redeemable Preferred Stock | ' |
REDEEMABLE PREFERRED STOCK | |
IPL - In March 2013, IPL redeemed all 6,000,000 outstanding shares of its 8.375% cumulative preferred stock for $150 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and IPL recorded a $5 million charge during the nine months ended September 30, 2013 related to this transaction in “Preferred dividend requirements” in their income statements. | |
WPL - In March 2013, WPL redeemed all 1,049,225 outstanding shares of its 4.40% through 6.50% cumulative preferred stock for $61 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and WPL recorded a $1 million charge during the nine months ended September 30, 2013 related to this transaction in “Preferred dividend requirements” in their income statements. | |
Refer to Note 12 for information on the fair value of cumulative preferred stock. | |
WPL [Member] | ' |
Redeemable Preferred Stock | ' |
REDEEMABLE PREFERRED STOCK | |
IPL - In March 2013, IPL redeemed all 6,000,000 outstanding shares of its 8.375% cumulative preferred stock for $150 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and IPL recorded a $5 million charge during the nine months ended September 30, 2013 related to this transaction in “Preferred dividend requirements” in their income statements. | |
WPL - In March 2013, WPL redeemed all 1,049,225 outstanding shares of its 4.40% through 6.50% cumulative preferred stock for $61 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and WPL recorded a $1 million charge during the nine months ended September 30, 2013 related to this transaction in “Preferred dividend requirements” in their income statements. | |
Refer to Note 12 for information on the fair value of cumulative preferred stock. |
Debt
Debt | 9 Months Ended | |||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||
Debt [Line Items] | ' | |||||||||||||||||||||||
Debt | ' | |||||||||||||||||||||||
DEBT | ||||||||||||||||||||||||
(a) Short-term Debt - Information regarding commercial paper classified as short-term debt and back-stopped by the credit facilities was as follows (dollars in millions): | ||||||||||||||||||||||||
Alliant Energy | Parent | |||||||||||||||||||||||
September 30, 2014 | (Consolidated) | Company | IPL | WPL | ||||||||||||||||||||
Commercial paper: | ||||||||||||||||||||||||
Amount outstanding | $353.80 | $169.10 | $38.00 | $146.70 | ||||||||||||||||||||
Weighted average remaining maturity | 3 days | 3 days | 1 day | 3 days | ||||||||||||||||||||
Weighted average interest rates | 0.20% | 0.30% | 0.30% | 0.10% | ||||||||||||||||||||
Available credit facility capacity | $646.20 | $130.90 | $262.00 | $253.30 | ||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $— | $185.00 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $307.10 | $228.80 | $0.40 | $— | $157.90 | $140.90 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.3 | % | N/A | 0.1 | % | 0.2 | % | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $26.30 | $204.70 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $281.90 | $197.20 | $0.30 | $1.70 | $157.50 | $113.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.2 | % | 0.4 | % | 0.1 | % | 0.2 | % | ||||||||||||
(b) Long-term Debt - In July 2014, IPL retired its $38.4 million, 5% pollution control revenue bonds. In October 2014, WPL issued $250 million of 4.10% debentures due 2044. The proceeds from the issuance were used by WPL to reduce commercial paper and for general corporate purposes. In October 2014, Alliant Energy entered into a $250 million variable-rate (0.75% at October 31, 2014) term loan credit agreement and used the proceeds from borrowings under this agreement to retire its $250 million, 4% senior notes. The term loan credit agreement expires in October 2016. | ||||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||
Debt [Line Items] | ' | |||||||||||||||||||||||
Debt | ' | |||||||||||||||||||||||
DEBT | ||||||||||||||||||||||||
(a) Short-term Debt - Information regarding commercial paper classified as short-term debt and back-stopped by the credit facilities was as follows (dollars in millions): | ||||||||||||||||||||||||
Alliant Energy | Parent | |||||||||||||||||||||||
September 30, 2014 | (Consolidated) | Company | IPL | WPL | ||||||||||||||||||||
Commercial paper: | ||||||||||||||||||||||||
Amount outstanding | $353.80 | $169.10 | $38.00 | $146.70 | ||||||||||||||||||||
Weighted average remaining maturity | 3 days | 3 days | 1 day | 3 days | ||||||||||||||||||||
Weighted average interest rates | 0.20% | 0.30% | 0.30% | 0.10% | ||||||||||||||||||||
Available credit facility capacity | $646.20 | $130.90 | $262.00 | $253.30 | ||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $— | $185.00 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $307.10 | $228.80 | $0.40 | $— | $157.90 | $140.90 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.3 | % | N/A | 0.1 | % | 0.2 | % | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $26.30 | $204.70 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $281.90 | $197.20 | $0.30 | $1.70 | $157.50 | $113.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.2 | % | 0.4 | % | 0.1 | % | 0.2 | % | ||||||||||||
(b) Long-term Debt - In July 2014, IPL retired its $38.4 million, 5% pollution control revenue bonds. In October 2014, WPL issued $250 million of 4.10% debentures due 2044. The proceeds from the issuance were used by WPL to reduce commercial paper and for general corporate purposes. In October 2014, Alliant Energy entered into a $250 million variable-rate (0.75% at October 31, 2014) term loan credit agreement and used the proceeds from borrowings under this agreement to retire its $250 million, 4% senior notes. The term loan credit agreement expires in October 2016. | ||||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||
Debt [Line Items] | ' | |||||||||||||||||||||||
Debt | ' | |||||||||||||||||||||||
DEBT | ||||||||||||||||||||||||
(a) Short-term Debt - Information regarding commercial paper classified as short-term debt and back-stopped by the credit facilities was as follows (dollars in millions): | ||||||||||||||||||||||||
Alliant Energy | Parent | |||||||||||||||||||||||
September 30, 2014 | (Consolidated) | Company | IPL | WPL | ||||||||||||||||||||
Commercial paper: | ||||||||||||||||||||||||
Amount outstanding | $353.80 | $169.10 | $38.00 | $146.70 | ||||||||||||||||||||
Weighted average remaining maturity | 3 days | 3 days | 1 day | 3 days | ||||||||||||||||||||
Weighted average interest rates | 0.20% | 0.30% | 0.30% | 0.10% | ||||||||||||||||||||
Available credit facility capacity | $646.20 | $130.90 | $262.00 | $253.30 | ||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $— | $185.00 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $307.10 | $228.80 | $0.40 | $— | $157.90 | $140.90 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.3 | % | N/A | 0.1 | % | 0.2 | % | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $26.30 | $204.70 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $281.90 | $197.20 | $0.30 | $1.70 | $157.50 | $113.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.2 | % | 0.4 | % | 0.1 | % | 0.2 | % | ||||||||||||
(b) Long-term Debt - In July 2014, IPL retired its $38.4 million, 5% pollution control revenue bonds. In October 2014, WPL issued $250 million of 4.10% debentures due 2044. The proceeds from the issuance were used by WPL to reduce commercial paper and for general corporate purposes. In October 2014, Alliant Energy entered into a $250 million variable-rate (0.75% at October 31, 2014) term loan credit agreement and used the proceeds from borrowings under this agreement to retire its $250 million, 4% senior notes. The term loan credit agreement expires in October 2016. |
Income_Taxes
Income Taxes | 9 Months Ended | ||||||||||||||||||||
Sep. 30, 2014 | |||||||||||||||||||||
Income Taxes [Line Items] | ' | ||||||||||||||||||||
Income Taxes | ' | ||||||||||||||||||||
INCOME TAXES | |||||||||||||||||||||
Income Tax Rates - The provision for income taxes for earnings from continuing operations is based on an estimated annual effective income tax rate that excludes the impact of significant unusual or infrequently occurring items, discontinued operations or extraordinary items. The overall income tax rates shown in the following table were computed by dividing income tax expense (benefit) by income from continuing operations before income taxes. | |||||||||||||||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (13.0 | ) | (12.9 | ) | (39.2 | ) | (38.9 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (8.6 | ) | (6.2 | ) | (22.4 | ) | (16.5 | ) | (0.8 | ) | (1.4 | ) | |||||||||
Production tax credits | (6.8 | ) | (7.7 | ) | (9.3 | ) | (10.6 | ) | (6.2 | ) | (6.6 | ) | |||||||||
Other items, net | 0.7 | 1.6 | 2.2 | 0.4 | — | 3.7 | |||||||||||||||
Overall income tax rate | 7.3 | % | 9.8 | % | (33.7 | %) | (30.6 | %) | 28 | % | 30.7 | % | |||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (12.4 | ) | (12.6 | ) | (36.5 | ) | (37.8 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (6.7 | ) | (5.9 | ) | (18.4 | ) | (16.1 | ) | (0.7 | ) | (0.8 | ) | |||||||||
Production tax credits | (6.6 | ) | (7.7 | ) | (8.8 | ) | (10.4 | ) | (6.2 | ) | (6.9 | ) | |||||||||
Other items, net | 2.9 | 2.6 | 3.2 | 0.8 | 3 | 4.4 | |||||||||||||||
Overall income tax rate | 12.2 | % | 11.4 | % | (25.5 | %) | (28.5 | %) | 31.1 | % | 31.7 | % | |||||||||
IPL’s tax benefit riders - Alliant Energy’s and IPL’s effective income tax rates include the impact of reducing income tax expense with offsetting reductions to regulatory liabilities as a result of implementing IPL’s tax benefit riders. Refer to Note 2 for additional details of the tax benefit riders. | |||||||||||||||||||||
Effect of rate-making on property-related differences - Alliant Energy’s and IPL’s effective income tax rates are impacted by certain property-related differences for which deferred tax is not recognized in the income statement pursuant to rate-making principles, substantially all of which relates to IPL. The increased benefits from property-related differences recognized during the three and nine months ended September 30, 2014 was primarily due to additional deductions from the allocation of mixed service costs related to Marshalltown. | |||||||||||||||||||||
Production tax credits - For the three and nine months ended September 30, details regarding production tax credits (net of state tax impacts) related to various wind projects are as follows (dollars in millions): | |||||||||||||||||||||
End of Production | Nameplate | Three Months | Nine Months | ||||||||||||||||||
Tax Credit Generation | Capacity in MW | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||
Cedar Ridge (WPL) | Dec-18 | 68 | $0.60 | $0.60 | $2.80 | $2.90 | |||||||||||||||
Bent Tree - Phase I (WPL) | Feb-21 | 201 | 2 | 2.2 | 9.4 | 9.2 | |||||||||||||||
Subtotal (WPL) | 2.6 | 2.8 | 12.2 | 12.1 | |||||||||||||||||
Whispering Willow - East (IPL) | Dec-19 | 200 | 2 | 2.3 | 9.8 | 10.3 | |||||||||||||||
$4.60 | $5.10 | $22.00 | $22.40 | ||||||||||||||||||
Deferred Tax Assets and Liabilities - For the nine months ended September 30, 2014, Alliant Energy’s, IPL’s and WPL’s non-current deferred tax liabilities increased $177.6 million, $123.6 million and $54.6 million, respectively. These increases in non-current deferred tax liabilities were primarily due to property-related differences recorded during the nine months ended September 30, 2014, including tax accounting method changes for cost of removal expenditures and generation repairs, which are discussed in Note 2. | |||||||||||||||||||||
Carryforwards - At September 30, 2014, tax carryforwards and associated deferred tax assets and expiration dates were estimated as follows (dollars in millions): | |||||||||||||||||||||
Alliant Energy | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $710 | $244 | 2029 | ||||||||||||||||||
State net operating losses | 744 | 37 | 2018 | ||||||||||||||||||
Federal tax credits | 193 | 190 | 2022 | ||||||||||||||||||
$471 | |||||||||||||||||||||
IPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $310 | $106 | 2029 | ||||||||||||||||||
State net operating losses | 217 | 11 | 2018 | ||||||||||||||||||
Federal tax credits | 64 | 63 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
WPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $305 | $105 | 2029 | ||||||||||||||||||
State net operating losses | 116 | 6 | 2018 | ||||||||||||||||||
Federal tax credits | 71 | 69 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
IPL [Member] | ' | ||||||||||||||||||||
Income Taxes [Line Items] | ' | ||||||||||||||||||||
Income Taxes | ' | ||||||||||||||||||||
INCOME TAXES | |||||||||||||||||||||
Income Tax Rates - The provision for income taxes for earnings from continuing operations is based on an estimated annual effective income tax rate that excludes the impact of significant unusual or infrequently occurring items, discontinued operations or extraordinary items. The overall income tax rates shown in the following table were computed by dividing income tax expense (benefit) by income from continuing operations before income taxes. | |||||||||||||||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (13.0 | ) | (12.9 | ) | (39.2 | ) | (38.9 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (8.6 | ) | (6.2 | ) | (22.4 | ) | (16.5 | ) | (0.8 | ) | (1.4 | ) | |||||||||
Production tax credits | (6.8 | ) | (7.7 | ) | (9.3 | ) | (10.6 | ) | (6.2 | ) | (6.6 | ) | |||||||||
Other items, net | 0.7 | 1.6 | 2.2 | 0.4 | — | 3.7 | |||||||||||||||
Overall income tax rate | 7.3 | % | 9.8 | % | (33.7 | %) | (30.6 | %) | 28 | % | 30.7 | % | |||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (12.4 | ) | (12.6 | ) | (36.5 | ) | (37.8 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (6.7 | ) | (5.9 | ) | (18.4 | ) | (16.1 | ) | (0.7 | ) | (0.8 | ) | |||||||||
Production tax credits | (6.6 | ) | (7.7 | ) | (8.8 | ) | (10.4 | ) | (6.2 | ) | (6.9 | ) | |||||||||
Other items, net | 2.9 | 2.6 | 3.2 | 0.8 | 3 | 4.4 | |||||||||||||||
Overall income tax rate | 12.2 | % | 11.4 | % | (25.5 | %) | (28.5 | %) | 31.1 | % | 31.7 | % | |||||||||
IPL’s tax benefit riders - Alliant Energy’s and IPL’s effective income tax rates include the impact of reducing income tax expense with offsetting reductions to regulatory liabilities as a result of implementing IPL’s tax benefit riders. Refer to Note 2 for additional details of the tax benefit riders. | |||||||||||||||||||||
Effect of rate-making on property-related differences - Alliant Energy’s and IPL’s effective income tax rates are impacted by certain property-related differences for which deferred tax is not recognized in the income statement pursuant to rate-making principles, substantially all of which relates to IPL. The increased benefits from property-related differences recognized during the three and nine months ended September 30, 2014 was primarily due to additional deductions from the allocation of mixed service costs related to Marshalltown. | |||||||||||||||||||||
Production tax credits - For the three and nine months ended September 30, details regarding production tax credits (net of state tax impacts) related to various wind projects are as follows (dollars in millions): | |||||||||||||||||||||
End of Production | Nameplate | Three Months | Nine Months | ||||||||||||||||||
Tax Credit Generation | Capacity in MW | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||
Cedar Ridge (WPL) | Dec-18 | 68 | $0.60 | $0.60 | $2.80 | $2.90 | |||||||||||||||
Bent Tree - Phase I (WPL) | Feb-21 | 201 | 2 | 2.2 | 9.4 | 9.2 | |||||||||||||||
Subtotal (WPL) | 2.6 | 2.8 | 12.2 | 12.1 | |||||||||||||||||
Whispering Willow - East (IPL) | Dec-19 | 200 | 2 | 2.3 | 9.8 | 10.3 | |||||||||||||||
$4.60 | $5.10 | $22.00 | $22.40 | ||||||||||||||||||
Deferred Tax Assets and Liabilities - For the nine months ended September 30, 2014, Alliant Energy’s, IPL’s and WPL’s non-current deferred tax liabilities increased $177.6 million, $123.6 million and $54.6 million, respectively. These increases in non-current deferred tax liabilities were primarily due to property-related differences recorded during the nine months ended September 30, 2014, including tax accounting method changes for cost of removal expenditures and generation repairs, which are discussed in Note 2. | |||||||||||||||||||||
Carryforwards - At September 30, 2014, tax carryforwards and associated deferred tax assets and expiration dates were estimated as follows (dollars in millions): | |||||||||||||||||||||
Alliant Energy | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $710 | $244 | 2029 | ||||||||||||||||||
State net operating losses | 744 | 37 | 2018 | ||||||||||||||||||
Federal tax credits | 193 | 190 | 2022 | ||||||||||||||||||
$471 | |||||||||||||||||||||
IPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $310 | $106 | 2029 | ||||||||||||||||||
State net operating losses | 217 | 11 | 2018 | ||||||||||||||||||
Federal tax credits | 64 | 63 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
WPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $305 | $105 | 2029 | ||||||||||||||||||
State net operating losses | 116 | 6 | 2018 | ||||||||||||||||||
Federal tax credits | 71 | 69 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
WPL [Member] | ' | ||||||||||||||||||||
Income Taxes [Line Items] | ' | ||||||||||||||||||||
Income Taxes | ' | ||||||||||||||||||||
INCOME TAXES | |||||||||||||||||||||
Income Tax Rates - The provision for income taxes for earnings from continuing operations is based on an estimated annual effective income tax rate that excludes the impact of significant unusual or infrequently occurring items, discontinued operations or extraordinary items. The overall income tax rates shown in the following table were computed by dividing income tax expense (benefit) by income from continuing operations before income taxes. | |||||||||||||||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (13.0 | ) | (12.9 | ) | (39.2 | ) | (38.9 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (8.6 | ) | (6.2 | ) | (22.4 | ) | (16.5 | ) | (0.8 | ) | (1.4 | ) | |||||||||
Production tax credits | (6.8 | ) | (7.7 | ) | (9.3 | ) | (10.6 | ) | (6.2 | ) | (6.6 | ) | |||||||||
Other items, net | 0.7 | 1.6 | 2.2 | 0.4 | — | 3.7 | |||||||||||||||
Overall income tax rate | 7.3 | % | 9.8 | % | (33.7 | %) | (30.6 | %) | 28 | % | 30.7 | % | |||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (12.4 | ) | (12.6 | ) | (36.5 | ) | (37.8 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (6.7 | ) | (5.9 | ) | (18.4 | ) | (16.1 | ) | (0.7 | ) | (0.8 | ) | |||||||||
Production tax credits | (6.6 | ) | (7.7 | ) | (8.8 | ) | (10.4 | ) | (6.2 | ) | (6.9 | ) | |||||||||
Other items, net | 2.9 | 2.6 | 3.2 | 0.8 | 3 | 4.4 | |||||||||||||||
Overall income tax rate | 12.2 | % | 11.4 | % | (25.5 | %) | (28.5 | %) | 31.1 | % | 31.7 | % | |||||||||
IPL’s tax benefit riders - Alliant Energy’s and IPL’s effective income tax rates include the impact of reducing income tax expense with offsetting reductions to regulatory liabilities as a result of implementing IPL’s tax benefit riders. Refer to Note 2 for additional details of the tax benefit riders. | |||||||||||||||||||||
Effect of rate-making on property-related differences - Alliant Energy’s and IPL’s effective income tax rates are impacted by certain property-related differences for which deferred tax is not recognized in the income statement pursuant to rate-making principles, substantially all of which relates to IPL. The increased benefits from property-related differences recognized during the three and nine months ended September 30, 2014 was primarily due to additional deductions from the allocation of mixed service costs related to Marshalltown. | |||||||||||||||||||||
Production tax credits - For the three and nine months ended September 30, details regarding production tax credits (net of state tax impacts) related to various wind projects are as follows (dollars in millions): | |||||||||||||||||||||
End of Production | Nameplate | Three Months | Nine Months | ||||||||||||||||||
Tax Credit Generation | Capacity in MW | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||
Cedar Ridge (WPL) | Dec-18 | 68 | $0.60 | $0.60 | $2.80 | $2.90 | |||||||||||||||
Bent Tree - Phase I (WPL) | Feb-21 | 201 | 2 | 2.2 | 9.4 | 9.2 | |||||||||||||||
Subtotal (WPL) | 2.6 | 2.8 | 12.2 | 12.1 | |||||||||||||||||
Whispering Willow - East (IPL) | Dec-19 | 200 | 2 | 2.3 | 9.8 | 10.3 | |||||||||||||||
$4.60 | $5.10 | $22.00 | $22.40 | ||||||||||||||||||
Deferred Tax Assets and Liabilities - For the nine months ended September 30, 2014, Alliant Energy’s, IPL’s and WPL’s non-current deferred tax liabilities increased $177.6 million, $123.6 million and $54.6 million, respectively. These increases in non-current deferred tax liabilities were primarily due to property-related differences recorded during the nine months ended September 30, 2014, including tax accounting method changes for cost of removal expenditures and generation repairs, which are discussed in Note 2. | |||||||||||||||||||||
Carryforwards - At September 30, 2014, tax carryforwards and associated deferred tax assets and expiration dates were estimated as follows (dollars in millions): | |||||||||||||||||||||
Alliant Energy | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $710 | $244 | 2029 | ||||||||||||||||||
State net operating losses | 744 | 37 | 2018 | ||||||||||||||||||
Federal tax credits | 193 | 190 | 2022 | ||||||||||||||||||
$471 | |||||||||||||||||||||
IPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $310 | $106 | 2029 | ||||||||||||||||||
State net operating losses | 217 | 11 | 2018 | ||||||||||||||||||
Federal tax credits | 64 | 63 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
WPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $305 | $105 | 2029 | ||||||||||||||||||
State net operating losses | 116 | 6 | 2018 | ||||||||||||||||||
Federal tax credits | 71 | 69 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
Benefit_Plans
Benefit Plans | 9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||||||||||||||||||||||||||
Benefit Plans | ' | |||||||||||||||||||||||||||||||||||||||||||||||
BENEFIT PLANS | ||||||||||||||||||||||||||||||||||||||||||||||||
(a) Pension and Other Postretirement Benefits Plans - | ||||||||||||||||||||||||||||||||||||||||||||||||
Net Periodic Benefit Costs (Credits) - The components of net periodic benefit costs (credits) for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included in the tables below (in millions). In the “IPL” and “WPL” tables below, the defined benefit pension plans costs represent those respective costs for IPL’s and WPL’s bargaining unit employees covered under the qualified plans that are sponsored by IPL and WPL, respectively, as well as amounts directly assigned to each of IPL and WPL related to IPL’s and WPL’s current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In the “IPL” and “WPL” tables below, the OPEB plans costs (credits) represent costs (credits) for IPL and WPL employees, respectively. | ||||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $3.30 | $3.90 | $9.90 | $11.80 | $1.30 | $1.50 | $3.90 | $4.70 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 13.6 | 12.3 | 40.6 | 36.8 | 2.4 | 2.1 | 7.1 | 6.3 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (18.8 | ) | (18.5 | ) | (56.3 | ) | (55.5 | ) | (2.1 | ) | (2.0 | ) | (6.2 | ) | (6.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | — | 0.2 | (3.0 | ) | (3.0 | ) | (8.9 | ) | (8.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 4.8 | 9 | 14.6 | 27.1 | 0.6 | 1.3 | 1.8 | 3.7 | ||||||||||||||||||||||||||||||||||||||||
$2.90 | $6.80 | $8.80 | $20.40 | ($0.8 | ) | ($0.1 | ) | ($2.3 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
IPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.80 | $2.20 | $5.40 | $6.50 | $0.60 | $0.80 | $1.80 | $2.20 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 6.2 | 5.7 | 18.8 | 17.1 | 1 | 0.9 | 3 | 2.7 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.9 | ) | (8.8 | ) | (26.8 | ) | (26.4 | ) | (1.5 | ) | (1.4 | ) | (4.4 | ) | (4.2 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | — | — | 0.1 | (1.6 | ) | (1.6 | ) | (4.7 | ) | (4.7 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2 | 3.8 | 6 | 11.4 | 0.3 | 0.6 | 0.8 | 2 | ||||||||||||||||||||||||||||||||||||||||
$1.10 | $2.90 | $3.40 | $8.70 | ($1.2 | ) | ($0.7 | ) | ($3.5 | ) | ($2.0 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
WPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.30 | $1.50 | $3.70 | $4.40 | $0.50 | $0.60 | $1.50 | $1.80 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 5.7 | 5.2 | 17 | 15.5 | 1 | 0.8 | 2.9 | 2.5 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.1 | ) | (8.0 | ) | (24.3 | ) | (23.9 | ) | (0.4 | ) | (0.4 | ) | (1.0 | ) | (1.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | 0.2 | 0.3 | (1.0 | ) | (0.9 | ) | (2.9 | ) | (2.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2.3 | 4.2 | 6.9 | 12.8 | 0.3 | 0.5 | 0.9 | 1.5 | ||||||||||||||||||||||||||||||||||||||||
$1.20 | $3.00 | $3.50 | $9.10 | $0.40 | $0.60 | $1.40 | $1.90 | |||||||||||||||||||||||||||||||||||||||||
Corporate Services provides services to IPL and WPL, and as a result, IPL and WPL are allocated pension and OPEB costs (credits) associated with Corporate Services employees. Such costs (credits) are allocated to IPL and WPL based on labor costs of plan participants. The following table includes the allocated qualified and non-qualified pension and OPEB costs (credits) associated with Corporate Services employees providing services to IPL and WPL for the three and nine months ended September 30 (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Pension Benefits Costs | OPEB Credits | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||
IPL | $0.40 | $0.40 | $1.10 | $1.40 | $— | ($0.1 | ) | ($0.2 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
WPL | 0.3 | 0.4 | 0.8 | 1.1 | (0.1 | ) | (0.1 | ) | (0.2 | ) | (0.2 | ) | ||||||||||||||||||||||||||||||||||||
401(k) Savings Plans - A significant number of employees participate in defined contribution retirement plans (401(k) savings plans). For the three and nine months ended September 30, costs related to the 401(k) savings plans, which are partially based on the participants’ contributions, were as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL (a) | WPL (a) | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
401(k) costs | $5.30 | $4.70 | $17.30 | $14.70 | $2.70 | $2.40 | $8.40 | $7.60 | $2.40 | $2.10 | $8.30 | $6.50 | ||||||||||||||||||||||||||||||||||||
(a) | IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees. | |||||||||||||||||||||||||||||||||||||||||||||||
(b) Equity-based Compensation Plans - A summary of compensation expense (including amounts allocated to IPL and WPL) and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
Compensation expense | $1.20 | $4.00 | $7.40 | $8.60 | $0.60 | $2.00 | $4.00 | $4.40 | $0.50 | $1.70 | $3.10 | $3.70 | ||||||||||||||||||||||||||||||||||||
Income tax benefits | 0.5 | 1.6 | 3 | 3.5 | 0.2 | 0.8 | 1.6 | 1.8 | 0.3 | 0.7 | 1.3 | 1.5 | ||||||||||||||||||||||||||||||||||||
As of September 30, 2014, total unrecognized compensation cost related to share-based compensation awards was $7.0 million, which is expected to be recognized over a weighted average period of between 1 and 2 years. Share-based compensation expense is recognized on a straight-line basis over the requisite service periods and is primarily recorded in “Utility - Other operation and maintenance” in the income statements. | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Shares and Units - | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Shares - A summary of the performance shares activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, January 1 | 139,940 | 145,277 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 51,221 | 49,093 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested | (45,235 | ) | (54,430 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (1,502 | ) | — | |||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, September 30 | 144,424 | 139,940 | ||||||||||||||||||||||||||||||||||||||||||||||
During the nine months ended September 30, certain performance shares vested, resulting in payouts (a combination of cash and common stock) as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
2011 Grant | 2010 Grant | |||||||||||||||||||||||||||||||||||||||||||||||
Performance shares vested | 45,235 | 54,430 | ||||||||||||||||||||||||||||||||||||||||||||||
Percentage of target number of performance shares | 147.5 | % | 197.5 | % | ||||||||||||||||||||||||||||||||||||||||||||
Aggregate payout value (in millions) | $3.40 | $4.80 | ||||||||||||||||||||||||||||||||||||||||||||||
Payout - cash (in millions) | $2.90 | $4.40 | ||||||||||||||||||||||||||||||||||||||||||||||
Payout - common stock shares issued | 4,810 | 4,177 | ||||||||||||||||||||||||||||||||||||||||||||||
Performance Units - A summary of the performance units activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested units, January 1 | 65,912 | 64,969 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 20,422 | 22,201 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested | (20,751 | ) | (19,760 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (958 | ) | (1,498 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Nonvested units, September 30 | 64,625 | 65,912 | ||||||||||||||||||||||||||||||||||||||||||||||
During the nine months ended September 30, certain performance units vested, resulting in cash payouts as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
2011 Grant | 2010 Grant | |||||||||||||||||||||||||||||||||||||||||||||||
Performance units vested | 20,751 | 19,760 | ||||||||||||||||||||||||||||||||||||||||||||||
Percentage of target number of performance units | 147.5 | % | 197.5 | % | ||||||||||||||||||||||||||||||||||||||||||||
Payout value (in millions) | $1.20 | $1.30 | ||||||||||||||||||||||||||||||||||||||||||||||
Fair Value of Awards - Information related to fair values of nonvested performance shares and units at September 30, 2014, by year of grant, was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Shares | Performance Units | |||||||||||||||||||||||||||||||||||||||||||||||
2014 Grant | 2013 Grant | 2012 Grant | 2014 Grant | 2013 Grant | 2012 Grant | |||||||||||||||||||||||||||||||||||||||||||
Nonvested awards | 49,719 | 49,093 | 45,612 | 19,775 | 21,726 | 23,124 | ||||||||||||||||||||||||||||||||||||||||||
Alliant Energy common stock closing price on September 30, 2014 | $55.41 | $55.41 | $55.41 | |||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy common stock closing price on grant date | $53.77 | $47.58 | $43.05 | |||||||||||||||||||||||||||||||||||||||||||||
Estimated payout percentage based on performance criteria | 94 | % | 117 | % | 126 | % | 94 | % | 117 | % | 126 | % | ||||||||||||||||||||||||||||||||||||
Fair values of each nonvested award | $52.09 | $64.83 | $69.82 | $50.54 | $55.67 | $54.24 | ||||||||||||||||||||||||||||||||||||||||||
At September 30, 2014, fair values of nonvested performance shares and units were calculated using a Monte Carlo simulation to determine the anticipated total shareowner returns of Alliant Energy and its investor-owned utility peer groups. Expected volatility was based on historical volatilities using daily stock prices over the past three years. Expected dividend yields were calculated based on the most recent quarterly dividend rates announced prior to the measurement date and stock prices at the measurement date. The risk-free interest rate was based on the three-year U.S. Treasury rate in effect as of the measurement date. | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Contingent Restricted Stock - A summary of the performance contingent restricted stock activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Shares | Weighted | Shares | Weighted | |||||||||||||||||||||||||||||||||||||||||||||
Average | Average | |||||||||||||||||||||||||||||||||||||||||||||||
Fair Value | Fair Value | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, January 1 | 158,922 | $42.71 | 211,651 | $32.42 | ||||||||||||||||||||||||||||||||||||||||||||
Granted | 51,221 | 53.77 | 49,093 | 47.58 | ||||||||||||||||||||||||||||||||||||||||||||
Vested (a) | (90,847 | ) | 40.91 | — | — | |||||||||||||||||||||||||||||||||||||||||||
Forfeited (b) | (20,484 | ) | 39.85 | (101,822 | ) | 23.67 | ||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, September 30 | 98,812 | 50.69 | 158,922 | 42.71 | ||||||||||||||||||||||||||||||||||||||||||||
(a) | In 2014, 45,612 and 45,235 performance contingent restricted shares granted in 2012 and 2011, respectively, vested because the specified performance criteria for such shares were met. | |||||||||||||||||||||||||||||||||||||||||||||||
(b) | In 2013, 101,822 performance contingent restricted shares granted in 2009 were forfeited because the specified performance criteria for such shares were not met. | |||||||||||||||||||||||||||||||||||||||||||||||
Performance Contingent Cash Awards - A summary of the performance contingent cash awards activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested awards, January 1 | 96,977 | 59,639 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 42,446 | 39,530 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested (a) | (55,517 | ) | — | |||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (4,295 | ) | (1,413 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Nonvested awards, September 30 | 79,611 | 97,756 | ||||||||||||||||||||||||||||||||||||||||||||||
(a) | In 2014, 34,766 and 20,751 performance contingent cash awards granted in 2012 and 2011 vested, resulting in cash payouts valued at $1.9 million and $1.1 million, respectively. | |||||||||||||||||||||||||||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Benefit Plans | ' | |||||||||||||||||||||||||||||||||||||||||||||||
BENEFIT PLANS | ||||||||||||||||||||||||||||||||||||||||||||||||
(a) Pension and Other Postretirement Benefits Plans - | ||||||||||||||||||||||||||||||||||||||||||||||||
Net Periodic Benefit Costs (Credits) - The components of net periodic benefit costs (credits) for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included in the tables below (in millions). In the “IPL” and “WPL” tables below, the defined benefit pension plans costs represent those respective costs for IPL’s and WPL’s bargaining unit employees covered under the qualified plans that are sponsored by IPL and WPL, respectively, as well as amounts directly assigned to each of IPL and WPL related to IPL’s and WPL’s current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In the “IPL” and “WPL” tables below, the OPEB plans costs (credits) represent costs (credits) for IPL and WPL employees, respectively. | ||||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $3.30 | $3.90 | $9.90 | $11.80 | $1.30 | $1.50 | $3.90 | $4.70 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 13.6 | 12.3 | 40.6 | 36.8 | 2.4 | 2.1 | 7.1 | 6.3 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (18.8 | ) | (18.5 | ) | (56.3 | ) | (55.5 | ) | (2.1 | ) | (2.0 | ) | (6.2 | ) | (6.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | — | 0.2 | (3.0 | ) | (3.0 | ) | (8.9 | ) | (8.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 4.8 | 9 | 14.6 | 27.1 | 0.6 | 1.3 | 1.8 | 3.7 | ||||||||||||||||||||||||||||||||||||||||
$2.90 | $6.80 | $8.80 | $20.40 | ($0.8 | ) | ($0.1 | ) | ($2.3 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
IPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.80 | $2.20 | $5.40 | $6.50 | $0.60 | $0.80 | $1.80 | $2.20 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 6.2 | 5.7 | 18.8 | 17.1 | 1 | 0.9 | 3 | 2.7 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.9 | ) | (8.8 | ) | (26.8 | ) | (26.4 | ) | (1.5 | ) | (1.4 | ) | (4.4 | ) | (4.2 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | — | — | 0.1 | (1.6 | ) | (1.6 | ) | (4.7 | ) | (4.7 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2 | 3.8 | 6 | 11.4 | 0.3 | 0.6 | 0.8 | 2 | ||||||||||||||||||||||||||||||||||||||||
$1.10 | $2.90 | $3.40 | $8.70 | ($1.2 | ) | ($0.7 | ) | ($3.5 | ) | ($2.0 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
WPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.30 | $1.50 | $3.70 | $4.40 | $0.50 | $0.60 | $1.50 | $1.80 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 5.7 | 5.2 | 17 | 15.5 | 1 | 0.8 | 2.9 | 2.5 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.1 | ) | (8.0 | ) | (24.3 | ) | (23.9 | ) | (0.4 | ) | (0.4 | ) | (1.0 | ) | (1.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | 0.2 | 0.3 | (1.0 | ) | (0.9 | ) | (2.9 | ) | (2.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2.3 | 4.2 | 6.9 | 12.8 | 0.3 | 0.5 | 0.9 | 1.5 | ||||||||||||||||||||||||||||||||||||||||
$1.20 | $3.00 | $3.50 | $9.10 | $0.40 | $0.60 | $1.40 | $1.90 | |||||||||||||||||||||||||||||||||||||||||
Corporate Services provides services to IPL and WPL, and as a result, IPL and WPL are allocated pension and OPEB costs (credits) associated with Corporate Services employees. Such costs (credits) are allocated to IPL and WPL based on labor costs of plan participants. The following table includes the allocated qualified and non-qualified pension and OPEB costs (credits) associated with Corporate Services employees providing services to IPL and WPL for the three and nine months ended September 30 (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Pension Benefits Costs | OPEB Credits | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||
IPL | $0.40 | $0.40 | $1.10 | $1.40 | $— | ($0.1 | ) | ($0.2 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
WPL | 0.3 | 0.4 | 0.8 | 1.1 | (0.1 | ) | (0.1 | ) | (0.2 | ) | (0.2 | ) | ||||||||||||||||||||||||||||||||||||
401(k) Savings Plans - A significant number of employees participate in defined contribution retirement plans (401(k) savings plans). For the three and nine months ended September 30, costs related to the 401(k) savings plans, which are partially based on the participants’ contributions, were as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL (a) | WPL (a) | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
401(k) costs | $5.30 | $4.70 | $17.30 | $14.70 | $2.70 | $2.40 | $8.40 | $7.60 | $2.40 | $2.10 | $8.30 | $6.50 | ||||||||||||||||||||||||||||||||||||
(a) | IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees. | |||||||||||||||||||||||||||||||||||||||||||||||
(b) Equity-based Compensation Plans - A summary of compensation expense (including amounts allocated to IPL and WPL) and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
Compensation expense | $1.20 | $4.00 | $7.40 | $8.60 | $0.60 | $2.00 | $4.00 | $4.40 | $0.50 | $1.70 | $3.10 | $3.70 | ||||||||||||||||||||||||||||||||||||
Income tax benefits | 0.5 | 1.6 | 3 | 3.5 | 0.2 | 0.8 | 1.6 | 1.8 | 0.3 | 0.7 | 1.3 | 1.5 | ||||||||||||||||||||||||||||||||||||
As of September 30, 2014, total unrecognized compensation cost related to share-based compensation awards was $7.0 million, which is expected to be recognized over a weighted average period of between 1 and 2 years. Share-based compensation expense is recognized on a straight-line basis over the requisite service periods and is primarily recorded in “Utility - Other operation and maintenance” in the income statements. | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Shares and Units - | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Shares - A summary of the performance shares activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, January 1 | 139,940 | 145,277 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 51,221 | 49,093 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested | (45,235 | ) | (54,430 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (1,502 | ) | — | |||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, September 30 | 144,424 | 139,940 | ||||||||||||||||||||||||||||||||||||||||||||||
During the nine months ended September 30, certain performance shares vested, resulting in payouts (a combination of cash and common stock) as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
2011 Grant | 2010 Grant | |||||||||||||||||||||||||||||||||||||||||||||||
Performance shares vested | 45,235 | 54,430 | ||||||||||||||||||||||||||||||||||||||||||||||
Percentage of target number of performance shares | 147.5 | % | 197.5 | % | ||||||||||||||||||||||||||||||||||||||||||||
Aggregate payout value (in millions) | $3.40 | $4.80 | ||||||||||||||||||||||||||||||||||||||||||||||
Payout - cash (in millions) | $2.90 | $4.40 | ||||||||||||||||||||||||||||||||||||||||||||||
Payout - common stock shares issued | 4,810 | 4,177 | ||||||||||||||||||||||||||||||||||||||||||||||
Performance Units - A summary of the performance units activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested units, January 1 | 65,912 | 64,969 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 20,422 | 22,201 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested | (20,751 | ) | (19,760 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (958 | ) | (1,498 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Nonvested units, September 30 | 64,625 | 65,912 | ||||||||||||||||||||||||||||||||||||||||||||||
During the nine months ended September 30, certain performance units vested, resulting in cash payouts as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
2011 Grant | 2010 Grant | |||||||||||||||||||||||||||||||||||||||||||||||
Performance units vested | 20,751 | 19,760 | ||||||||||||||||||||||||||||||||||||||||||||||
Percentage of target number of performance units | 147.5 | % | 197.5 | % | ||||||||||||||||||||||||||||||||||||||||||||
Payout value (in millions) | $1.20 | $1.30 | ||||||||||||||||||||||||||||||||||||||||||||||
Fair Value of Awards - Information related to fair values of nonvested performance shares and units at September 30, 2014, by year of grant, was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Shares | Performance Units | |||||||||||||||||||||||||||||||||||||||||||||||
2014 Grant | 2013 Grant | 2012 Grant | 2014 Grant | 2013 Grant | 2012 Grant | |||||||||||||||||||||||||||||||||||||||||||
Nonvested awards | 49,719 | 49,093 | 45,612 | 19,775 | 21,726 | 23,124 | ||||||||||||||||||||||||||||||||||||||||||
Alliant Energy common stock closing price on September 30, 2014 | $55.41 | $55.41 | $55.41 | |||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy common stock closing price on grant date | $53.77 | $47.58 | $43.05 | |||||||||||||||||||||||||||||||||||||||||||||
Estimated payout percentage based on performance criteria | 94 | % | 117 | % | 126 | % | 94 | % | 117 | % | 126 | % | ||||||||||||||||||||||||||||||||||||
Fair values of each nonvested award | $52.09 | $64.83 | $69.82 | $50.54 | $55.67 | $54.24 | ||||||||||||||||||||||||||||||||||||||||||
At September 30, 2014, fair values of nonvested performance shares and units were calculated using a Monte Carlo simulation to determine the anticipated total shareowner returns of Alliant Energy and its investor-owned utility peer groups. Expected volatility was based on historical volatilities using daily stock prices over the past three years. Expected dividend yields were calculated based on the most recent quarterly dividend rates announced prior to the measurement date and stock prices at the measurement date. The risk-free interest rate was based on the three-year U.S. Treasury rate in effect as of the measurement date. | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Contingent Restricted Stock - A summary of the performance contingent restricted stock activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Shares | Weighted | Shares | Weighted | |||||||||||||||||||||||||||||||||||||||||||||
Average | Average | |||||||||||||||||||||||||||||||||||||||||||||||
Fair Value | Fair Value | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, January 1 | 158,922 | $42.71 | 211,651 | $32.42 | ||||||||||||||||||||||||||||||||||||||||||||
Granted | 51,221 | 53.77 | 49,093 | 47.58 | ||||||||||||||||||||||||||||||||||||||||||||
Vested (a) | (90,847 | ) | 40.91 | — | — | |||||||||||||||||||||||||||||||||||||||||||
Forfeited (b) | (20,484 | ) | 39.85 | (101,822 | ) | 23.67 | ||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, September 30 | 98,812 | 50.69 | 158,922 | 42.71 | ||||||||||||||||||||||||||||||||||||||||||||
(a) | In 2014, 45,612 and 45,235 performance contingent restricted shares granted in 2012 and 2011, respectively, vested because the specified performance criteria for such shares were met. | |||||||||||||||||||||||||||||||||||||||||||||||
(b) | In 2013, 101,822 performance contingent restricted shares granted in 2009 were forfeited because the specified performance criteria for such shares were not met. | |||||||||||||||||||||||||||||||||||||||||||||||
Performance Contingent Cash Awards - A summary of the performance contingent cash awards activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested awards, January 1 | 96,977 | 59,639 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 42,446 | 39,530 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested (a) | (55,517 | ) | — | |||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (4,295 | ) | (1,413 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Nonvested awards, September 30 | 79,611 | 97,756 | ||||||||||||||||||||||||||||||||||||||||||||||
(a) | In 2014, 34,766 and 20,751 performance contingent cash awards granted in 2012 and 2011 vested, resulting in cash payouts valued at $1.9 million and $1.1 million, respectively. | |||||||||||||||||||||||||||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Benefit Plans | ' | |||||||||||||||||||||||||||||||||||||||||||||||
BENEFIT PLANS | ||||||||||||||||||||||||||||||||||||||||||||||||
(a) Pension and Other Postretirement Benefits Plans - | ||||||||||||||||||||||||||||||||||||||||||||||||
Net Periodic Benefit Costs (Credits) - The components of net periodic benefit costs (credits) for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included in the tables below (in millions). In the “IPL” and “WPL” tables below, the defined benefit pension plans costs represent those respective costs for IPL’s and WPL’s bargaining unit employees covered under the qualified plans that are sponsored by IPL and WPL, respectively, as well as amounts directly assigned to each of IPL and WPL related to IPL’s and WPL’s current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In the “IPL” and “WPL” tables below, the OPEB plans costs (credits) represent costs (credits) for IPL and WPL employees, respectively. | ||||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $3.30 | $3.90 | $9.90 | $11.80 | $1.30 | $1.50 | $3.90 | $4.70 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 13.6 | 12.3 | 40.6 | 36.8 | 2.4 | 2.1 | 7.1 | 6.3 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (18.8 | ) | (18.5 | ) | (56.3 | ) | (55.5 | ) | (2.1 | ) | (2.0 | ) | (6.2 | ) | (6.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | — | 0.2 | (3.0 | ) | (3.0 | ) | (8.9 | ) | (8.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 4.8 | 9 | 14.6 | 27.1 | 0.6 | 1.3 | 1.8 | 3.7 | ||||||||||||||||||||||||||||||||||||||||
$2.90 | $6.80 | $8.80 | $20.40 | ($0.8 | ) | ($0.1 | ) | ($2.3 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
IPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.80 | $2.20 | $5.40 | $6.50 | $0.60 | $0.80 | $1.80 | $2.20 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 6.2 | 5.7 | 18.8 | 17.1 | 1 | 0.9 | 3 | 2.7 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.9 | ) | (8.8 | ) | (26.8 | ) | (26.4 | ) | (1.5 | ) | (1.4 | ) | (4.4 | ) | (4.2 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | — | — | 0.1 | (1.6 | ) | (1.6 | ) | (4.7 | ) | (4.7 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2 | 3.8 | 6 | 11.4 | 0.3 | 0.6 | 0.8 | 2 | ||||||||||||||||||||||||||||||||||||||||
$1.10 | $2.90 | $3.40 | $8.70 | ($1.2 | ) | ($0.7 | ) | ($3.5 | ) | ($2.0 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
WPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.30 | $1.50 | $3.70 | $4.40 | $0.50 | $0.60 | $1.50 | $1.80 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 5.7 | 5.2 | 17 | 15.5 | 1 | 0.8 | 2.9 | 2.5 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.1 | ) | (8.0 | ) | (24.3 | ) | (23.9 | ) | (0.4 | ) | (0.4 | ) | (1.0 | ) | (1.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | 0.2 | 0.3 | (1.0 | ) | (0.9 | ) | (2.9 | ) | (2.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2.3 | 4.2 | 6.9 | 12.8 | 0.3 | 0.5 | 0.9 | 1.5 | ||||||||||||||||||||||||||||||||||||||||
$1.20 | $3.00 | $3.50 | $9.10 | $0.40 | $0.60 | $1.40 | $1.90 | |||||||||||||||||||||||||||||||||||||||||
Corporate Services provides services to IPL and WPL, and as a result, IPL and WPL are allocated pension and OPEB costs (credits) associated with Corporate Services employees. Such costs (credits) are allocated to IPL and WPL based on labor costs of plan participants. The following table includes the allocated qualified and non-qualified pension and OPEB costs (credits) associated with Corporate Services employees providing services to IPL and WPL for the three and nine months ended September 30 (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Pension Benefits Costs | OPEB Credits | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||
IPL | $0.40 | $0.40 | $1.10 | $1.40 | $— | ($0.1 | ) | ($0.2 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
WPL | 0.3 | 0.4 | 0.8 | 1.1 | (0.1 | ) | (0.1 | ) | (0.2 | ) | (0.2 | ) | ||||||||||||||||||||||||||||||||||||
401(k) Savings Plans - A significant number of employees participate in defined contribution retirement plans (401(k) savings plans). For the three and nine months ended September 30, costs related to the 401(k) savings plans, which are partially based on the participants’ contributions, were as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL (a) | WPL (a) | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
401(k) costs | $5.30 | $4.70 | $17.30 | $14.70 | $2.70 | $2.40 | $8.40 | $7.60 | $2.40 | $2.10 | $8.30 | $6.50 | ||||||||||||||||||||||||||||||||||||
(a) | IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees. | |||||||||||||||||||||||||||||||||||||||||||||||
(b) Equity-based Compensation Plans - A summary of compensation expense (including amounts allocated to IPL and WPL) and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
Compensation expense | $1.20 | $4.00 | $7.40 | $8.60 | $0.60 | $2.00 | $4.00 | $4.40 | $0.50 | $1.70 | $3.10 | $3.70 | ||||||||||||||||||||||||||||||||||||
Income tax benefits | 0.5 | 1.6 | 3 | 3.5 | 0.2 | 0.8 | 1.6 | 1.8 | 0.3 | 0.7 | 1.3 | 1.5 | ||||||||||||||||||||||||||||||||||||
As of September 30, 2014, total unrecognized compensation cost related to share-based compensation awards was $7.0 million, which is expected to be recognized over a weighted average period of between 1 and 2 years. Share-based compensation expense is recognized on a straight-line basis over the requisite service periods and is primarily recorded in “Utility - Other operation and maintenance” in the income statements. | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Shares and Units - | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Shares - A summary of the performance shares activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, January 1 | 139,940 | 145,277 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 51,221 | 49,093 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested | (45,235 | ) | (54,430 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (1,502 | ) | — | |||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, September 30 | 144,424 | 139,940 | ||||||||||||||||||||||||||||||||||||||||||||||
During the nine months ended September 30, certain performance shares vested, resulting in payouts (a combination of cash and common stock) as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
2011 Grant | 2010 Grant | |||||||||||||||||||||||||||||||||||||||||||||||
Performance shares vested | 45,235 | 54,430 | ||||||||||||||||||||||||||||||||||||||||||||||
Percentage of target number of performance shares | 147.5 | % | 197.5 | % | ||||||||||||||||||||||||||||||||||||||||||||
Aggregate payout value (in millions) | $3.40 | $4.80 | ||||||||||||||||||||||||||||||||||||||||||||||
Payout - cash (in millions) | $2.90 | $4.40 | ||||||||||||||||||||||||||||||||||||||||||||||
Payout - common stock shares issued | 4,810 | 4,177 | ||||||||||||||||||||||||||||||||||||||||||||||
Performance Units - A summary of the performance units activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested units, January 1 | 65,912 | 64,969 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 20,422 | 22,201 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested | (20,751 | ) | (19,760 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (958 | ) | (1,498 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Nonvested units, September 30 | 64,625 | 65,912 | ||||||||||||||||||||||||||||||||||||||||||||||
During the nine months ended September 30, certain performance units vested, resulting in cash payouts as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
2011 Grant | 2010 Grant | |||||||||||||||||||||||||||||||||||||||||||||||
Performance units vested | 20,751 | 19,760 | ||||||||||||||||||||||||||||||||||||||||||||||
Percentage of target number of performance units | 147.5 | % | 197.5 | % | ||||||||||||||||||||||||||||||||||||||||||||
Payout value (in millions) | $1.20 | $1.30 | ||||||||||||||||||||||||||||||||||||||||||||||
Fair Value of Awards - Information related to fair values of nonvested performance shares and units at September 30, 2014, by year of grant, was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Shares | Performance Units | |||||||||||||||||||||||||||||||||||||||||||||||
2014 Grant | 2013 Grant | 2012 Grant | 2014 Grant | 2013 Grant | 2012 Grant | |||||||||||||||||||||||||||||||||||||||||||
Nonvested awards | 49,719 | 49,093 | 45,612 | 19,775 | 21,726 | 23,124 | ||||||||||||||||||||||||||||||||||||||||||
Alliant Energy common stock closing price on September 30, 2014 | $55.41 | $55.41 | $55.41 | |||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy common stock closing price on grant date | $53.77 | $47.58 | $43.05 | |||||||||||||||||||||||||||||||||||||||||||||
Estimated payout percentage based on performance criteria | 94 | % | 117 | % | 126 | % | 94 | % | 117 | % | 126 | % | ||||||||||||||||||||||||||||||||||||
Fair values of each nonvested award | $52.09 | $64.83 | $69.82 | $50.54 | $55.67 | $54.24 | ||||||||||||||||||||||||||||||||||||||||||
At September 30, 2014, fair values of nonvested performance shares and units were calculated using a Monte Carlo simulation to determine the anticipated total shareowner returns of Alliant Energy and its investor-owned utility peer groups. Expected volatility was based on historical volatilities using daily stock prices over the past three years. Expected dividend yields were calculated based on the most recent quarterly dividend rates announced prior to the measurement date and stock prices at the measurement date. The risk-free interest rate was based on the three-year U.S. Treasury rate in effect as of the measurement date. | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Contingent Restricted Stock - A summary of the performance contingent restricted stock activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Shares | Weighted | Shares | Weighted | |||||||||||||||||||||||||||||||||||||||||||||
Average | Average | |||||||||||||||||||||||||||||||||||||||||||||||
Fair Value | Fair Value | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, January 1 | 158,922 | $42.71 | 211,651 | $32.42 | ||||||||||||||||||||||||||||||||||||||||||||
Granted | 51,221 | 53.77 | 49,093 | 47.58 | ||||||||||||||||||||||||||||||||||||||||||||
Vested (a) | (90,847 | ) | 40.91 | — | — | |||||||||||||||||||||||||||||||||||||||||||
Forfeited (b) | (20,484 | ) | 39.85 | (101,822 | ) | 23.67 | ||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, September 30 | 98,812 | 50.69 | 158,922 | 42.71 | ||||||||||||||||||||||||||||||||||||||||||||
(a) | In 2014, 45,612 and 45,235 performance contingent restricted shares granted in 2012 and 2011, respectively, vested because the specified performance criteria for such shares were met. | |||||||||||||||||||||||||||||||||||||||||||||||
(b) | In 2013, 101,822 performance contingent restricted shares granted in 2009 were forfeited because the specified performance criteria for such shares were not met. | |||||||||||||||||||||||||||||||||||||||||||||||
Performance Contingent Cash Awards - A summary of the performance contingent cash awards activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested awards, January 1 | 96,977 | 59,639 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 42,446 | 39,530 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested (a) | (55,517 | ) | — | |||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (4,295 | ) | (1,413 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Nonvested awards, September 30 | 79,611 | 97,756 | ||||||||||||||||||||||||||||||||||||||||||||||
(a) | In 2014, 34,766 and 20,751 performance contingent cash awards granted in 2012 and 2011 vested, resulting in cash payouts valued at $1.9 million and $1.1 million, respectively. |
Asset_Retirement_Obligations
Asset Retirement Obligations | 9 Months Ended | |||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||
Asset Retirement Obligations [Line Items] | ' | |||||||||||||||||||||||
Asset Retirement Obligations (AROs) | ' | |||||||||||||||||||||||
ASSET RETIREMENT OBLIGATIONS | ||||||||||||||||||||||||
A reconciliation of the changes in AROs associated with long-lived assets is as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Balance, January 1 | $109.70 | $101.50 | $47.90 | $45.50 | $52.40 | $46.90 | ||||||||||||||||||
Revisions in estimated cash flows | — | 3.4 | — | 0.8 | — | 2.6 | ||||||||||||||||||
Liabilities settled | (1.0 | ) | (0.9 | ) | (0.5 | ) | (0.1 | ) | (0.5 | ) | (0.8 | ) | ||||||||||||
Liabilities incurred (a) | 16.5 | — | 16.3 | — | 0.2 | — | ||||||||||||||||||
Accretion expense | 3.3 | 2.8 | 1.6 | 1.3 | 1.3 | 1.2 | ||||||||||||||||||
Balance, September 30 | $128.50 | $106.80 | $65.30 | $47.50 | $53.40 | $49.90 | ||||||||||||||||||
(a) | In 2014, IPL recorded AROs of $12.0 million related to its Sutherland Generating Station. | |||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||
Asset Retirement Obligations [Line Items] | ' | |||||||||||||||||||||||
Asset Retirement Obligations (AROs) | ' | |||||||||||||||||||||||
ASSET RETIREMENT OBLIGATIONS | ||||||||||||||||||||||||
A reconciliation of the changes in AROs associated with long-lived assets is as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Balance, January 1 | $109.70 | $101.50 | $47.90 | $45.50 | $52.40 | $46.90 | ||||||||||||||||||
Revisions in estimated cash flows | — | 3.4 | — | 0.8 | — | 2.6 | ||||||||||||||||||
Liabilities settled | (1.0 | ) | (0.9 | ) | (0.5 | ) | (0.1 | ) | (0.5 | ) | (0.8 | ) | ||||||||||||
Liabilities incurred (a) | 16.5 | — | 16.3 | — | 0.2 | — | ||||||||||||||||||
Accretion expense | 3.3 | 2.8 | 1.6 | 1.3 | 1.3 | 1.2 | ||||||||||||||||||
Balance, September 30 | $128.50 | $106.80 | $65.30 | $47.50 | $53.40 | $49.90 | ||||||||||||||||||
(a) | In 2014, IPL recorded AROs of $12.0 million related to its Sutherland Generating Station. | |||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||
Asset Retirement Obligations [Line Items] | ' | |||||||||||||||||||||||
Asset Retirement Obligations (AROs) | ' | |||||||||||||||||||||||
ASSET RETIREMENT OBLIGATIONS | ||||||||||||||||||||||||
A reconciliation of the changes in AROs associated with long-lived assets is as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Balance, January 1 | $109.70 | $101.50 | $47.90 | $45.50 | $52.40 | $46.90 | ||||||||||||||||||
Revisions in estimated cash flows | — | 3.4 | — | 0.8 | — | 2.6 | ||||||||||||||||||
Liabilities settled | (1.0 | ) | (0.9 | ) | (0.5 | ) | (0.1 | ) | (0.5 | ) | (0.8 | ) | ||||||||||||
Liabilities incurred (a) | 16.5 | — | 16.3 | — | 0.2 | — | ||||||||||||||||||
Accretion expense | 3.3 | 2.8 | 1.6 | 1.3 | 1.3 | 1.2 | ||||||||||||||||||
Balance, September 30 | $128.50 | $106.80 | $65.30 | $47.50 | $53.40 | $49.90 | ||||||||||||||||||
(a) | In 2014, IPL recorded AROs of $12.0 million related to its Sutherland Generating Station. |
Fair_Value_Measurements
Fair Value Measurements | 9 Months Ended | |||||||||||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||||||||||
Fair Value Measurements | ' | |||||||||||||||||||||||||||||||
FAIR VALUE MEASUREMENTS | ||||||||||||||||||||||||||||||||
Fair Value of Financial Instruments - The carrying amounts of current assets and current liabilities approximate fair value because of the short maturity of such financial instruments. Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
September 30, 2014 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $83.10 | $83.10 | $44.70 | $44.70 | $38.40 | $38.40 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 160.3 | 160.3 | 160.3 | 160.3 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,292.30 | 3,852.60 | 1,520.30 | 1,778.20 | 1,324.00 | 1,618.00 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 200.2 | 200 | 200.2 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 14.1 | 14.1 | 8.2 | 8.2 | 5.9 | 5.9 | ||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
December 31, 2013 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $26.70 | $26.70 | $21.10 | $21.10 | $5.60 | $5.60 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 203.5 | 203.5 | 203.5 | 203.5 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,336.30 | 3,712.30 | 1,558.40 | 1,726.40 | 1,332.10 | 1,532.90 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 167 | 200 | 167 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 20.8 | 20.8 | 5.2 | 5.2 | 15.6 | 15.6 | ||||||||||||||||||||||||||
Valuation Hierarchy - At each reporting date, Level 1 items included IPL’s 5.1% cumulative preferred stock, Level 2 items included certain non-exchange traded commodity contracts and substantially all of the long-term debt instruments, and Level 3 items included FTRs, certain non-exchange traded commodity contracts and IPL’s deferred proceeds. | ||||||||||||||||||||||||||||||||
Valuation Techniques - | ||||||||||||||||||||||||||||||||
Derivative assets and derivative liabilities - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs, and risk policies are maintained that govern the use of such derivative instruments. Derivative instruments were not designated as hedging instruments and included the following: | ||||||||||||||||||||||||||||||||
Risk management purpose | Type of instrument | |||||||||||||||||||||||||||||||
Mitigate pricing volatility for: | ||||||||||||||||||||||||||||||||
Electricity purchased to supply customers | Electric swap and physical forward contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Fuel used to supply natural gas-fired EGUs | Natural gas swap contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Natural gas options and physical forward contracts (WPL) | ||||||||||||||||||||||||||||||||
Natural gas supplied to retail customers | Natural gas options and physical forward contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Natural gas swap contracts (IPL) | ||||||||||||||||||||||||||||||||
Fuel used at coal-fired EGUs | Coal physical forward contract with volumetric optionality (IPL and WPL) | |||||||||||||||||||||||||||||||
Optimize the value of natural gas pipeline capacity | Natural gas physical forward contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Natural gas swap contracts (IPL) | ||||||||||||||||||||||||||||||||
Manage transmission congestion costs | FTRs (IPL and WPL) | |||||||||||||||||||||||||||||||
Swap, option and physical forward commodity contracts were non-exchange-based derivative instruments and were valued using indicative price quotations from a pricing vendor that provides daily exchange forward price settlements, from broker or dealer quotations, from market publications or from on-line exchanges. The indicative price quotations reflected the average of the bid-ask mid-point prices and were obtained from sources believed to provide the most liquid market for the commodity. A portion of these indicative price quotations were corroborated using quoted prices for similar assets or liabilities in active markets and categorized derivative instruments based on such indicative price quotations as Level 2. Commodity contracts that were valued using indicative price quotations based on significant assumptions such as seasonal or monthly shaping and indicative price quotations that could not be readily corroborated were categorized as Level 3. Swap, option and physical forward commodity contracts were predominately at liquid trading points. FTRs were valued using monthly or annual auction shadow prices from relevant auctions and were categorized as Level 3. Refer to Note 13 for additional details of derivative assets and derivative liabilities. | ||||||||||||||||||||||||||||||||
The fair value measurements of Level 3 derivative instruments include observable and unobservable inputs. The observable inputs are obtained from third-party pricing sources, counterparties and brokers and include bids, offers, historical transactions (including historical price differences between locations with both observable and unobservable prices) and executed trades. The significant unobservable inputs used in the fair value measurement of commodity contracts are forecasted electricity, natural gas and coal prices, and the expected volatility of such prices. Significant changes in any of those inputs would result in a significantly lower or higher fair value measurement. | ||||||||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) - The fair value of IPL’s deferred proceeds related to its sales of accounts receivable program was calculated each reporting date using the cost approach valuation technique. The fair value represents the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold due to the short-term nature of the collection period. These inputs were considered unobservable and deferred proceeds were categorized as Level 3. Deferred proceeds represent IPL’s maximum exposure to loss related to the receivables sold. Refer to Note 4(a) for additional information regarding deferred proceeds. | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) - The fair value of long-term debt instruments was based on quoted market prices for similar liabilities at each reporting date or on a discounted cash flow methodology, which utilizes assumptions of current market pricing curves at each reporting date. Refer to Note 8(b) for additional information regarding long-term debt. | ||||||||||||||||||||||||||||||||
Cumulative preferred stock - The fair value of IPL’s 5.1% cumulative preferred stock was based on its closing market price quoted by the New York Stock Exchange at each reporting date. Refer to Note 7 for additional information regarding cumulative preferred stock. | ||||||||||||||||||||||||||||||||
Items subject to fair value measurement disclosure requirements were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $83.10 | $— | $6.30 | $76.80 | $26.70 | $— | $4.70 | $22.00 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 3,852.60 | — | 3,849.30 | 3.3 | 3,712.30 | — | 3,711.80 | 0.5 | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 14.1 | — | 5.6 | 8.5 | 20.8 | — | 3.2 | 17.6 | ||||||||||||||||||||||||
IPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $44.70 | $— | $4.30 | $40.40 | $21.10 | $— | $3.00 | $18.10 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,778.20 | — | 1,778.20 | — | 1,726.40 | — | 1,726.40 | — | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 8.2 | — | 4.3 | 3.9 | 5.2 | — | 1.7 | 3.5 | ||||||||||||||||||||||||
WPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $38.40 | $— | $2.00 | $36.40 | $5.60 | $— | $1.70 | $3.90 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,618.00 | — | 1,618.00 | — | 1,532.90 | — | 1,532.90 | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 5.9 | — | 1.3 | 4.6 | 15.6 | — | 1.5 | 14.1 | ||||||||||||||||||||||||
Gains and losses from derivative instruments are generally recorded with offsets to regulatory assets or regulatory liabilities, based on fuel and natural gas cost recovery mechanisms, as well as other specific regulatory authorizations. Based on these recovery mechanisms, the changes in the fair value of derivative liabilities resulted in comparable changes to regulatory assets, and the changes in the fair value of derivative assets resulted in comparable changes to regulatory liabilities. | ||||||||||||||||||||||||||||||||
Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $101.20 | $42.50 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (12.7 | ) | 0.1 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.9 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (19.0 | ) | (15.5 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($10.3 | ) | $0.10 | $— | $— | |||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $4.40 | $11.90 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 43 | (8.3 | ) | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (0.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 76.7 | 50.9 | — | — | ||||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (54.6 | ) | (36.4 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | $34.60 | ($8.3 | ) | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $64.20 | $40.60 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (10.1 | ) | 2 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.1 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (16.6 | ) | (13.9 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($9.6 | ) | $2.00 | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $14.60 | $12.50 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (5.1 | ) | 1.5 | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (1.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 68.8 | 46.1 | — | — | ||||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (40.8 | ) | (30.0 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($6.0 | ) | $1.50 | $— | $— | |||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, July 1 | $37.00 | $1.90 | ||||||||||||||||||||||||||||||
Total net losses (realized/unrealized) included in changes in net assets (a) | (2.6 | ) | (1.9 | ) | ||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.8 | ) | |||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (2.4 | ) | (1.6 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30 (a) | ($0.7 | ) | ($1.9 | ) | ||||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, January 1 | ($10.2 | ) | ($0.6 | ) | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 48.1 | (9.8 | ) | |||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | |||||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | 1 | ||||||||||||||||||||||||||||||
Purchases | 7.9 | 4.8 | ||||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (13.8 | ) | (6.4 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at September 30 (a) | $40.60 | ($9.8 | ) | |||||||||||||||||||||||||||||
(a) | Unrealized gains and losses related to derivative assets and derivative liabilities are recorded in regulatory assets and regulatory liabilities on the balance sheets. | |||||||||||||||||||||||||||||||
(b) | Markets for similar assets and liabilities became inactive and observable market inputs became unavailable for transfers into Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
(c) | Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold. | |||||||||||||||||||||||||||||||
(d) | Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
Commodity Contracts - The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
Excluding FTRs | FTRs | Excluding FTRs | FTRs | Excluding FTRs | FTRs | |||||||||||||||||||||||||||
September 30, 2014 | $29.70 | $38.60 | $3.30 | $33.20 | $26.40 | $5.40 | ||||||||||||||||||||||||||
31-Dec-13 | (13.9 | ) | 18.3 | (2.1 | ) | 16.7 | (11.8 | ) | 1.6 | |||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||||||||||
Fair Value Measurements | ' | |||||||||||||||||||||||||||||||
FAIR VALUE MEASUREMENTS | ||||||||||||||||||||||||||||||||
Fair Value of Financial Instruments - The carrying amounts of current assets and current liabilities approximate fair value because of the short maturity of such financial instruments. Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
September 30, 2014 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $83.10 | $83.10 | $44.70 | $44.70 | $38.40 | $38.40 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 160.3 | 160.3 | 160.3 | 160.3 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,292.30 | 3,852.60 | 1,520.30 | 1,778.20 | 1,324.00 | 1,618.00 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 200.2 | 200 | 200.2 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 14.1 | 14.1 | 8.2 | 8.2 | 5.9 | 5.9 | ||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
December 31, 2013 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $26.70 | $26.70 | $21.10 | $21.10 | $5.60 | $5.60 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 203.5 | 203.5 | 203.5 | 203.5 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,336.30 | 3,712.30 | 1,558.40 | 1,726.40 | 1,332.10 | 1,532.90 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 167 | 200 | 167 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 20.8 | 20.8 | 5.2 | 5.2 | 15.6 | 15.6 | ||||||||||||||||||||||||||
Valuation Hierarchy - At each reporting date, Level 1 items included IPL’s 5.1% cumulative preferred stock, Level 2 items included certain non-exchange traded commodity contracts and substantially all of the long-term debt instruments, and Level 3 items included FTRs, certain non-exchange traded commodity contracts and IPL’s deferred proceeds. | ||||||||||||||||||||||||||||||||
Valuation Techniques - | ||||||||||||||||||||||||||||||||
Derivative assets and derivative liabilities - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs, and risk policies are maintained that govern the use of such derivative instruments. Derivative instruments were not designated as hedging instruments and included the following: | ||||||||||||||||||||||||||||||||
Risk management purpose | Type of instrument | |||||||||||||||||||||||||||||||
Mitigate pricing volatility for: | ||||||||||||||||||||||||||||||||
Electricity purchased to supply customers | Electric swap and physical forward contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Fuel used to supply natural gas-fired EGUs | Natural gas swap contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Natural gas options and physical forward contracts (WPL) | ||||||||||||||||||||||||||||||||
Natural gas supplied to retail customers | Natural gas options and physical forward contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Natural gas swap contracts (IPL) | ||||||||||||||||||||||||||||||||
Fuel used at coal-fired EGUs | Coal physical forward contract with volumetric optionality (IPL and WPL) | |||||||||||||||||||||||||||||||
Optimize the value of natural gas pipeline capacity | Natural gas physical forward contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Natural gas swap contracts (IPL) | ||||||||||||||||||||||||||||||||
Manage transmission congestion costs | FTRs (IPL and WPL) | |||||||||||||||||||||||||||||||
Swap, option and physical forward commodity contracts were non-exchange-based derivative instruments and were valued using indicative price quotations from a pricing vendor that provides daily exchange forward price settlements, from broker or dealer quotations, from market publications or from on-line exchanges. The indicative price quotations reflected the average of the bid-ask mid-point prices and were obtained from sources believed to provide the most liquid market for the commodity. A portion of these indicative price quotations were corroborated using quoted prices for similar assets or liabilities in active markets and categorized derivative instruments based on such indicative price quotations as Level 2. Commodity contracts that were valued using indicative price quotations based on significant assumptions such as seasonal or monthly shaping and indicative price quotations that could not be readily corroborated were categorized as Level 3. Swap, option and physical forward commodity contracts were predominately at liquid trading points. FTRs were valued using monthly or annual auction shadow prices from relevant auctions and were categorized as Level 3. Refer to Note 13 for additional details of derivative assets and derivative liabilities. | ||||||||||||||||||||||||||||||||
The fair value measurements of Level 3 derivative instruments include observable and unobservable inputs. The observable inputs are obtained from third-party pricing sources, counterparties and brokers and include bids, offers, historical transactions (including historical price differences between locations with both observable and unobservable prices) and executed trades. The significant unobservable inputs used in the fair value measurement of commodity contracts are forecasted electricity, natural gas and coal prices, and the expected volatility of such prices. Significant changes in any of those inputs would result in a significantly lower or higher fair value measurement. | ||||||||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) - The fair value of IPL’s deferred proceeds related to its sales of accounts receivable program was calculated each reporting date using the cost approach valuation technique. The fair value represents the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold due to the short-term nature of the collection period. These inputs were considered unobservable and deferred proceeds were categorized as Level 3. Deferred proceeds represent IPL’s maximum exposure to loss related to the receivables sold. Refer to Note 4(a) for additional information regarding deferred proceeds. | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) - The fair value of long-term debt instruments was based on quoted market prices for similar liabilities at each reporting date or on a discounted cash flow methodology, which utilizes assumptions of current market pricing curves at each reporting date. Refer to Note 8(b) for additional information regarding long-term debt. | ||||||||||||||||||||||||||||||||
Cumulative preferred stock - The fair value of IPL’s 5.1% cumulative preferred stock was based on its closing market price quoted by the New York Stock Exchange at each reporting date. Refer to Note 7 for additional information regarding cumulative preferred stock. | ||||||||||||||||||||||||||||||||
Items subject to fair value measurement disclosure requirements were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $83.10 | $— | $6.30 | $76.80 | $26.70 | $— | $4.70 | $22.00 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 3,852.60 | — | 3,849.30 | 3.3 | 3,712.30 | — | 3,711.80 | 0.5 | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 14.1 | — | 5.6 | 8.5 | 20.8 | — | 3.2 | 17.6 | ||||||||||||||||||||||||
IPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $44.70 | $— | $4.30 | $40.40 | $21.10 | $— | $3.00 | $18.10 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,778.20 | — | 1,778.20 | — | 1,726.40 | — | 1,726.40 | — | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 8.2 | — | 4.3 | 3.9 | 5.2 | — | 1.7 | 3.5 | ||||||||||||||||||||||||
WPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $38.40 | $— | $2.00 | $36.40 | $5.60 | $— | $1.70 | $3.90 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,618.00 | — | 1,618.00 | — | 1,532.90 | — | 1,532.90 | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 5.9 | — | 1.3 | 4.6 | 15.6 | — | 1.5 | 14.1 | ||||||||||||||||||||||||
Gains and losses from derivative instruments are generally recorded with offsets to regulatory assets or regulatory liabilities, based on fuel and natural gas cost recovery mechanisms, as well as other specific regulatory authorizations. Based on these recovery mechanisms, the changes in the fair value of derivative liabilities resulted in comparable changes to regulatory assets, and the changes in the fair value of derivative assets resulted in comparable changes to regulatory liabilities. | ||||||||||||||||||||||||||||||||
Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $101.20 | $42.50 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (12.7 | ) | 0.1 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.9 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (19.0 | ) | (15.5 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($10.3 | ) | $0.10 | $— | $— | |||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $4.40 | $11.90 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 43 | (8.3 | ) | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (0.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 76.7 | 50.9 | — | — | ||||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (54.6 | ) | (36.4 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | $34.60 | ($8.3 | ) | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $64.20 | $40.60 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (10.1 | ) | 2 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.1 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (16.6 | ) | (13.9 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($9.6 | ) | $2.00 | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $14.60 | $12.50 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (5.1 | ) | 1.5 | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (1.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 68.8 | 46.1 | — | — | ||||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (40.8 | ) | (30.0 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($6.0 | ) | $1.50 | $— | $— | |||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, July 1 | $37.00 | $1.90 | ||||||||||||||||||||||||||||||
Total net losses (realized/unrealized) included in changes in net assets (a) | (2.6 | ) | (1.9 | ) | ||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.8 | ) | |||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (2.4 | ) | (1.6 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30 (a) | ($0.7 | ) | ($1.9 | ) | ||||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, January 1 | ($10.2 | ) | ($0.6 | ) | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 48.1 | (9.8 | ) | |||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | |||||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | 1 | ||||||||||||||||||||||||||||||
Purchases | 7.9 | 4.8 | ||||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (13.8 | ) | (6.4 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at September 30 (a) | $40.60 | ($9.8 | ) | |||||||||||||||||||||||||||||
(a) | Unrealized gains and losses related to derivative assets and derivative liabilities are recorded in regulatory assets and regulatory liabilities on the balance sheets. | |||||||||||||||||||||||||||||||
(b) | Markets for similar assets and liabilities became inactive and observable market inputs became unavailable for transfers into Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
(c) | Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold. | |||||||||||||||||||||||||||||||
(d) | Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
Commodity Contracts - The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
Excluding FTRs | FTRs | Excluding FTRs | FTRs | Excluding FTRs | FTRs | |||||||||||||||||||||||||||
September 30, 2014 | $29.70 | $38.60 | $3.30 | $33.20 | $26.40 | $5.40 | ||||||||||||||||||||||||||
31-Dec-13 | (13.9 | ) | 18.3 | (2.1 | ) | 16.7 | (11.8 | ) | 1.6 | |||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||||||||||
Fair Value Measurements | ' | |||||||||||||||||||||||||||||||
FAIR VALUE MEASUREMENTS | ||||||||||||||||||||||||||||||||
Fair Value of Financial Instruments - The carrying amounts of current assets and current liabilities approximate fair value because of the short maturity of such financial instruments. Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
September 30, 2014 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $83.10 | $83.10 | $44.70 | $44.70 | $38.40 | $38.40 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 160.3 | 160.3 | 160.3 | 160.3 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,292.30 | 3,852.60 | 1,520.30 | 1,778.20 | 1,324.00 | 1,618.00 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 200.2 | 200 | 200.2 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 14.1 | 14.1 | 8.2 | 8.2 | 5.9 | 5.9 | ||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
December 31, 2013 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $26.70 | $26.70 | $21.10 | $21.10 | $5.60 | $5.60 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 203.5 | 203.5 | 203.5 | 203.5 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,336.30 | 3,712.30 | 1,558.40 | 1,726.40 | 1,332.10 | 1,532.90 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 167 | 200 | 167 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 20.8 | 20.8 | 5.2 | 5.2 | 15.6 | 15.6 | ||||||||||||||||||||||||||
Valuation Hierarchy - At each reporting date, Level 1 items included IPL’s 5.1% cumulative preferred stock, Level 2 items included certain non-exchange traded commodity contracts and substantially all of the long-term debt instruments, and Level 3 items included FTRs, certain non-exchange traded commodity contracts and IPL’s deferred proceeds. | ||||||||||||||||||||||||||||||||
Valuation Techniques - | ||||||||||||||||||||||||||||||||
Derivative assets and derivative liabilities - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs, and risk policies are maintained that govern the use of such derivative instruments. Derivative instruments were not designated as hedging instruments and included the following: | ||||||||||||||||||||||||||||||||
Risk management purpose | Type of instrument | |||||||||||||||||||||||||||||||
Mitigate pricing volatility for: | ||||||||||||||||||||||||||||||||
Electricity purchased to supply customers | Electric swap and physical forward contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Fuel used to supply natural gas-fired EGUs | Natural gas swap contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Natural gas options and physical forward contracts (WPL) | ||||||||||||||||||||||||||||||||
Natural gas supplied to retail customers | Natural gas options and physical forward contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Natural gas swap contracts (IPL) | ||||||||||||||||||||||||||||||||
Fuel used at coal-fired EGUs | Coal physical forward contract with volumetric optionality (IPL and WPL) | |||||||||||||||||||||||||||||||
Optimize the value of natural gas pipeline capacity | Natural gas physical forward contracts (IPL and WPL) | |||||||||||||||||||||||||||||||
Natural gas swap contracts (IPL) | ||||||||||||||||||||||||||||||||
Manage transmission congestion costs | FTRs (IPL and WPL) | |||||||||||||||||||||||||||||||
Swap, option and physical forward commodity contracts were non-exchange-based derivative instruments and were valued using indicative price quotations from a pricing vendor that provides daily exchange forward price settlements, from broker or dealer quotations, from market publications or from on-line exchanges. The indicative price quotations reflected the average of the bid-ask mid-point prices and were obtained from sources believed to provide the most liquid market for the commodity. A portion of these indicative price quotations were corroborated using quoted prices for similar assets or liabilities in active markets and categorized derivative instruments based on such indicative price quotations as Level 2. Commodity contracts that were valued using indicative price quotations based on significant assumptions such as seasonal or monthly shaping and indicative price quotations that could not be readily corroborated were categorized as Level 3. Swap, option and physical forward commodity contracts were predominately at liquid trading points. FTRs were valued using monthly or annual auction shadow prices from relevant auctions and were categorized as Level 3. Refer to Note 13 for additional details of derivative assets and derivative liabilities. | ||||||||||||||||||||||||||||||||
The fair value measurements of Level 3 derivative instruments include observable and unobservable inputs. The observable inputs are obtained from third-party pricing sources, counterparties and brokers and include bids, offers, historical transactions (including historical price differences between locations with both observable and unobservable prices) and executed trades. The significant unobservable inputs used in the fair value measurement of commodity contracts are forecasted electricity, natural gas and coal prices, and the expected volatility of such prices. Significant changes in any of those inputs would result in a significantly lower or higher fair value measurement. | ||||||||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) - The fair value of IPL’s deferred proceeds related to its sales of accounts receivable program was calculated each reporting date using the cost approach valuation technique. The fair value represents the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold due to the short-term nature of the collection period. These inputs were considered unobservable and deferred proceeds were categorized as Level 3. Deferred proceeds represent IPL’s maximum exposure to loss related to the receivables sold. Refer to Note 4(a) for additional information regarding deferred proceeds. | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) - The fair value of long-term debt instruments was based on quoted market prices for similar liabilities at each reporting date or on a discounted cash flow methodology, which utilizes assumptions of current market pricing curves at each reporting date. Refer to Note 8(b) for additional information regarding long-term debt. | ||||||||||||||||||||||||||||||||
Cumulative preferred stock - The fair value of IPL’s 5.1% cumulative preferred stock was based on its closing market price quoted by the New York Stock Exchange at each reporting date. Refer to Note 7 for additional information regarding cumulative preferred stock. | ||||||||||||||||||||||||||||||||
Items subject to fair value measurement disclosure requirements were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $83.10 | $— | $6.30 | $76.80 | $26.70 | $— | $4.70 | $22.00 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 3,852.60 | — | 3,849.30 | 3.3 | 3,712.30 | — | 3,711.80 | 0.5 | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 14.1 | — | 5.6 | 8.5 | 20.8 | — | 3.2 | 17.6 | ||||||||||||||||||||||||
IPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $44.70 | $— | $4.30 | $40.40 | $21.10 | $— | $3.00 | $18.10 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,778.20 | — | 1,778.20 | — | 1,726.40 | — | 1,726.40 | — | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 8.2 | — | 4.3 | 3.9 | 5.2 | — | 1.7 | 3.5 | ||||||||||||||||||||||||
WPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $38.40 | $— | $2.00 | $36.40 | $5.60 | $— | $1.70 | $3.90 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,618.00 | — | 1,618.00 | — | 1,532.90 | — | 1,532.90 | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 5.9 | — | 1.3 | 4.6 | 15.6 | — | 1.5 | 14.1 | ||||||||||||||||||||||||
Gains and losses from derivative instruments are generally recorded with offsets to regulatory assets or regulatory liabilities, based on fuel and natural gas cost recovery mechanisms, as well as other specific regulatory authorizations. Based on these recovery mechanisms, the changes in the fair value of derivative liabilities resulted in comparable changes to regulatory assets, and the changes in the fair value of derivative assets resulted in comparable changes to regulatory liabilities. | ||||||||||||||||||||||||||||||||
Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $101.20 | $42.50 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (12.7 | ) | 0.1 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.9 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (19.0 | ) | (15.5 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($10.3 | ) | $0.10 | $— | $— | |||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $4.40 | $11.90 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 43 | (8.3 | ) | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (0.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 76.7 | 50.9 | — | — | ||||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (54.6 | ) | (36.4 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | $34.60 | ($8.3 | ) | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $64.20 | $40.60 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (10.1 | ) | 2 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.1 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (16.6 | ) | (13.9 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($9.6 | ) | $2.00 | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $14.60 | $12.50 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (5.1 | ) | 1.5 | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (1.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 68.8 | 46.1 | — | — | ||||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (40.8 | ) | (30.0 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($6.0 | ) | $1.50 | $— | $— | |||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, July 1 | $37.00 | $1.90 | ||||||||||||||||||||||||||||||
Total net losses (realized/unrealized) included in changes in net assets (a) | (2.6 | ) | (1.9 | ) | ||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.8 | ) | |||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (2.4 | ) | (1.6 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30 (a) | ($0.7 | ) | ($1.9 | ) | ||||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, January 1 | ($10.2 | ) | ($0.6 | ) | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 48.1 | (9.8 | ) | |||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | |||||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | 1 | ||||||||||||||||||||||||||||||
Purchases | 7.9 | 4.8 | ||||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (13.8 | ) | (6.4 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at September 30 (a) | $40.60 | ($9.8 | ) | |||||||||||||||||||||||||||||
(a) | Unrealized gains and losses related to derivative assets and derivative liabilities are recorded in regulatory assets and regulatory liabilities on the balance sheets. | |||||||||||||||||||||||||||||||
(b) | Markets for similar assets and liabilities became inactive and observable market inputs became unavailable for transfers into Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
(c) | Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold. | |||||||||||||||||||||||||||||||
(d) | Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
Commodity Contracts - The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
Excluding FTRs | FTRs | Excluding FTRs | FTRs | Excluding FTRs | FTRs | |||||||||||||||||||||||||||
September 30, 2014 | $29.70 | $38.60 | $3.30 | $33.20 | $26.40 | $5.40 | ||||||||||||||||||||||||||
31-Dec-13 | (13.9 | ) | 18.3 | (2.1 | ) | 16.7 | (11.8 | ) | 1.6 | |||||||||||||||||||||||
Derivative_Instruments
Derivative Instruments | 9 Months Ended | |||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||
Derivative Instruments [Line Items] | ' | |||||||||||||||||||||||
Derivative Instruments | ' | |||||||||||||||||||||||
DERIVATIVE INSTRUMENTS | ||||||||||||||||||||||||
Commodity Derivatives - | ||||||||||||||||||||||||
Purpose - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 12 for detailed discussion of derivative instruments. | ||||||||||||||||||||||||
Notional Amounts - As of September 30, 2014, gross notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands): | ||||||||||||||||||||||||
2014 | 2015 | 2016 | 2017 | 2018 | Total | |||||||||||||||||||
Alliant Energy | ||||||||||||||||||||||||
Electricity (MWhs) | 2,092 | 3,946 | 1,553 | 1,314 | 1,314 | 10,219 | ||||||||||||||||||
FTRs (MWhs) | 5,673 | 9,560 | — | — | — | 15,233 | ||||||||||||||||||
Natural gas (Dths) | 25,806 | 36,532 | 8,805 | 218 | — | 71,361 | ||||||||||||||||||
Coal (tons) | 836 | 1,490 | 1,899 | 1,073 | 1,113 | 6,411 | ||||||||||||||||||
IPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 1,678 | — | — | — | 2,724 | ||||||||||||||||||
FTRs (MWhs) | 3,340 | 5,558 | — | — | — | 8,898 | ||||||||||||||||||
Natural gas (Dths) | 17,823 | 25,776 | 3,862 | 218 | — | 47,679 | ||||||||||||||||||
Coal (tons) | 266 | 75 | 830 | 274 | 387 | 1,832 | ||||||||||||||||||
WPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 2,268 | 1,553 | 1,314 | 1,314 | 7,495 | ||||||||||||||||||
FTRs (MWhs) | 2,333 | 4,002 | — | — | — | 6,335 | ||||||||||||||||||
Natural gas (Dths) | 7,983 | 10,756 | 4,943 | — | — | 23,682 | ||||||||||||||||||
Coal (tons) | 570 | 1,415 | 1,069 | 799 | 726 | 4,579 | ||||||||||||||||||
Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheet as assets or liabilities. The fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other long-term liabilities and deferred credits” on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Commodity contracts | September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | ||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Current derivative assets | $63.90 | $25.60 | $44.00 | $20.20 | $19.90 | $5.40 | ||||||||||||||||||
Non-current derivative assets | 19.2 | 1.1 | 0.7 | 0.9 | 18.5 | 0.2 | ||||||||||||||||||
Current derivative liabilities | 9 | 6.7 | 5.2 | 3 | 3.8 | 3.7 | ||||||||||||||||||
Non-current derivative liabilities | 5.1 | 14.1 | 3 | 2.2 | 2.1 | 11.9 | ||||||||||||||||||
Changes in unrealized gains (losses) from commodity derivative instruments were recorded with offsets to regulatory assets or regulatory liabilities on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Three Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | $8.30 | $2.20 | $7.30 | ($0.4 | ) | $1.00 | $2.60 | |||||||||||||||||
Regulatory liabilities | (6.2 | ) | (1.0 | ) | (2.0 | ) | 3.6 | (4.2 | ) | (4.6 | ) | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | 13.8 | (14.2 | ) | 8.7 | (4.6 | ) | 5.1 | (9.6 | ) | |||||||||||||||
Regulatory liabilities | 63.2 | 16.6 | 13.9 | 9.9 | 49.3 | 6.7 | ||||||||||||||||||
Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided in the form of letters of credit or cash collateral up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. The aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position, as well as amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered, were as follows (in millions): | ||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||
Alliant Energy | IPL | WPL | Alliant Energy | IPL | WPL | |||||||||||||||||||
Aggregate fair value | $14.10 | $8.20 | $5.90 | $20.80 | $5.20 | $15.60 | ||||||||||||||||||
Credit support to be posted if triggered | 13.9 | 8.2 | 5.7 | 20.8 | 5.2 | 15.6 | ||||||||||||||||||
Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Gross | Gross | Gross | ||||||||||||||||||||||
(as reported) | Net | (as reported) | Net | (as reported) | Net | |||||||||||||||||||
September 30, 2014 | ||||||||||||||||||||||||
Derivative assets | $83.10 | $72.20 | $44.70 | $39.80 | $38.40 | $32.40 | ||||||||||||||||||
Derivative liabilities | 14.1 | 7.9 | 8.2 | 3.6 | 5.9 | 4.3 | ||||||||||||||||||
31-Dec-13 | ||||||||||||||||||||||||
Derivative assets | 26.7 | 23.5 | 21.1 | 19.5 | 5.6 | 4 | ||||||||||||||||||
Derivative liabilities | 20.8 | 17.6 | 5.2 | 3.6 | 15.6 | 14 | ||||||||||||||||||
Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. As of September 30, 2014, Alliant Energy’s, IPL’s and WPL’s net derivative assets in the above table have been reduced by $4.7 million, $0.3 million and $4.4 million, respectively, due to cash collateral posted by counterparties. | ||||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||
Derivative Instruments [Line Items] | ' | |||||||||||||||||||||||
Derivative Instruments | ' | |||||||||||||||||||||||
DERIVATIVE INSTRUMENTS | ||||||||||||||||||||||||
Commodity Derivatives - | ||||||||||||||||||||||||
Purpose - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 12 for detailed discussion of derivative instruments. | ||||||||||||||||||||||||
Notional Amounts - As of September 30, 2014, gross notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands): | ||||||||||||||||||||||||
2014 | 2015 | 2016 | 2017 | 2018 | Total | |||||||||||||||||||
Alliant Energy | ||||||||||||||||||||||||
Electricity (MWhs) | 2,092 | 3,946 | 1,553 | 1,314 | 1,314 | 10,219 | ||||||||||||||||||
FTRs (MWhs) | 5,673 | 9,560 | — | — | — | 15,233 | ||||||||||||||||||
Natural gas (Dths) | 25,806 | 36,532 | 8,805 | 218 | — | 71,361 | ||||||||||||||||||
Coal (tons) | 836 | 1,490 | 1,899 | 1,073 | 1,113 | 6,411 | ||||||||||||||||||
IPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 1,678 | — | — | — | 2,724 | ||||||||||||||||||
FTRs (MWhs) | 3,340 | 5,558 | — | — | — | 8,898 | ||||||||||||||||||
Natural gas (Dths) | 17,823 | 25,776 | 3,862 | 218 | — | 47,679 | ||||||||||||||||||
Coal (tons) | 266 | 75 | 830 | 274 | 387 | 1,832 | ||||||||||||||||||
WPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 2,268 | 1,553 | 1,314 | 1,314 | 7,495 | ||||||||||||||||||
FTRs (MWhs) | 2,333 | 4,002 | — | — | — | 6,335 | ||||||||||||||||||
Natural gas (Dths) | 7,983 | 10,756 | 4,943 | — | — | 23,682 | ||||||||||||||||||
Coal (tons) | 570 | 1,415 | 1,069 | 799 | 726 | 4,579 | ||||||||||||||||||
Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheet as assets or liabilities. The fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other long-term liabilities and deferred credits” on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Commodity contracts | September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | ||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Current derivative assets | $63.90 | $25.60 | $44.00 | $20.20 | $19.90 | $5.40 | ||||||||||||||||||
Non-current derivative assets | 19.2 | 1.1 | 0.7 | 0.9 | 18.5 | 0.2 | ||||||||||||||||||
Current derivative liabilities | 9 | 6.7 | 5.2 | 3 | 3.8 | 3.7 | ||||||||||||||||||
Non-current derivative liabilities | 5.1 | 14.1 | 3 | 2.2 | 2.1 | 11.9 | ||||||||||||||||||
Changes in unrealized gains (losses) from commodity derivative instruments were recorded with offsets to regulatory assets or regulatory liabilities on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Three Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | $8.30 | $2.20 | $7.30 | ($0.4 | ) | $1.00 | $2.60 | |||||||||||||||||
Regulatory liabilities | (6.2 | ) | (1.0 | ) | (2.0 | ) | 3.6 | (4.2 | ) | (4.6 | ) | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | 13.8 | (14.2 | ) | 8.7 | (4.6 | ) | 5.1 | (9.6 | ) | |||||||||||||||
Regulatory liabilities | 63.2 | 16.6 | 13.9 | 9.9 | 49.3 | 6.7 | ||||||||||||||||||
Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided in the form of letters of credit or cash collateral up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. The aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position, as well as amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered, were as follows (in millions): | ||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||
Alliant Energy | IPL | WPL | Alliant Energy | IPL | WPL | |||||||||||||||||||
Aggregate fair value | $14.10 | $8.20 | $5.90 | $20.80 | $5.20 | $15.60 | ||||||||||||||||||
Credit support to be posted if triggered | 13.9 | 8.2 | 5.7 | 20.8 | 5.2 | 15.6 | ||||||||||||||||||
Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Gross | Gross | Gross | ||||||||||||||||||||||
(as reported) | Net | (as reported) | Net | (as reported) | Net | |||||||||||||||||||
September 30, 2014 | ||||||||||||||||||||||||
Derivative assets | $83.10 | $72.20 | $44.70 | $39.80 | $38.40 | $32.40 | ||||||||||||||||||
Derivative liabilities | 14.1 | 7.9 | 8.2 | 3.6 | 5.9 | 4.3 | ||||||||||||||||||
31-Dec-13 | ||||||||||||||||||||||||
Derivative assets | 26.7 | 23.5 | 21.1 | 19.5 | 5.6 | 4 | ||||||||||||||||||
Derivative liabilities | 20.8 | 17.6 | 5.2 | 3.6 | 15.6 | 14 | ||||||||||||||||||
Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. As of September 30, 2014, Alliant Energy’s, IPL’s and WPL’s net derivative assets in the above table have been reduced by $4.7 million, $0.3 million and $4.4 million, respectively, due to cash collateral posted by counterparties. | ||||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||
Derivative Instruments [Line Items] | ' | |||||||||||||||||||||||
Derivative Instruments | ' | |||||||||||||||||||||||
DERIVATIVE INSTRUMENTS | ||||||||||||||||||||||||
Commodity Derivatives - | ||||||||||||||||||||||||
Purpose - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 12 for detailed discussion of derivative instruments. | ||||||||||||||||||||||||
Notional Amounts - As of September 30, 2014, gross notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands): | ||||||||||||||||||||||||
2014 | 2015 | 2016 | 2017 | 2018 | Total | |||||||||||||||||||
Alliant Energy | ||||||||||||||||||||||||
Electricity (MWhs) | 2,092 | 3,946 | 1,553 | 1,314 | 1,314 | 10,219 | ||||||||||||||||||
FTRs (MWhs) | 5,673 | 9,560 | — | — | — | 15,233 | ||||||||||||||||||
Natural gas (Dths) | 25,806 | 36,532 | 8,805 | 218 | — | 71,361 | ||||||||||||||||||
Coal (tons) | 836 | 1,490 | 1,899 | 1,073 | 1,113 | 6,411 | ||||||||||||||||||
IPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 1,678 | — | — | — | 2,724 | ||||||||||||||||||
FTRs (MWhs) | 3,340 | 5,558 | — | — | — | 8,898 | ||||||||||||||||||
Natural gas (Dths) | 17,823 | 25,776 | 3,862 | 218 | — | 47,679 | ||||||||||||||||||
Coal (tons) | 266 | 75 | 830 | 274 | 387 | 1,832 | ||||||||||||||||||
WPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 2,268 | 1,553 | 1,314 | 1,314 | 7,495 | ||||||||||||||||||
FTRs (MWhs) | 2,333 | 4,002 | — | — | — | 6,335 | ||||||||||||||||||
Natural gas (Dths) | 7,983 | 10,756 | 4,943 | — | — | 23,682 | ||||||||||||||||||
Coal (tons) | 570 | 1,415 | 1,069 | 799 | 726 | 4,579 | ||||||||||||||||||
Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheet as assets or liabilities. The fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other long-term liabilities and deferred credits” on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Commodity contracts | September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | ||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Current derivative assets | $63.90 | $25.60 | $44.00 | $20.20 | $19.90 | $5.40 | ||||||||||||||||||
Non-current derivative assets | 19.2 | 1.1 | 0.7 | 0.9 | 18.5 | 0.2 | ||||||||||||||||||
Current derivative liabilities | 9 | 6.7 | 5.2 | 3 | 3.8 | 3.7 | ||||||||||||||||||
Non-current derivative liabilities | 5.1 | 14.1 | 3 | 2.2 | 2.1 | 11.9 | ||||||||||||||||||
Changes in unrealized gains (losses) from commodity derivative instruments were recorded with offsets to regulatory assets or regulatory liabilities on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Three Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | $8.30 | $2.20 | $7.30 | ($0.4 | ) | $1.00 | $2.60 | |||||||||||||||||
Regulatory liabilities | (6.2 | ) | (1.0 | ) | (2.0 | ) | 3.6 | (4.2 | ) | (4.6 | ) | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | 13.8 | (14.2 | ) | 8.7 | (4.6 | ) | 5.1 | (9.6 | ) | |||||||||||||||
Regulatory liabilities | 63.2 | 16.6 | 13.9 | 9.9 | 49.3 | 6.7 | ||||||||||||||||||
Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided in the form of letters of credit or cash collateral up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. The aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position, as well as amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered, were as follows (in millions): | ||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||
Alliant Energy | IPL | WPL | Alliant Energy | IPL | WPL | |||||||||||||||||||
Aggregate fair value | $14.10 | $8.20 | $5.90 | $20.80 | $5.20 | $15.60 | ||||||||||||||||||
Credit support to be posted if triggered | 13.9 | 8.2 | 5.7 | 20.8 | 5.2 | 15.6 | ||||||||||||||||||
Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Gross | Gross | Gross | ||||||||||||||||||||||
(as reported) | Net | (as reported) | Net | (as reported) | Net | |||||||||||||||||||
September 30, 2014 | ||||||||||||||||||||||||
Derivative assets | $83.10 | $72.20 | $44.70 | $39.80 | $38.40 | $32.40 | ||||||||||||||||||
Derivative liabilities | 14.1 | 7.9 | 8.2 | 3.6 | 5.9 | 4.3 | ||||||||||||||||||
31-Dec-13 | ||||||||||||||||||||||||
Derivative assets | 26.7 | 23.5 | 21.1 | 19.5 | 5.6 | 4 | ||||||||||||||||||
Derivative liabilities | 20.8 | 17.6 | 5.2 | 3.6 | 15.6 | 14 | ||||||||||||||||||
Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. As of September 30, 2014, Alliant Energy’s, IPL’s and WPL’s net derivative assets in the above table have been reduced by $4.7 million, $0.3 million and $4.4 million, respectively, due to cash collateral posted by counterparties. |
Commitments_And_Contingencies
Commitments And Contingencies | 9 Months Ended | |||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||
Commitments and Contingencies Disclosure | ' | |||||||||||||||||
COMMITMENTS AND CONTINGENCIES | ||||||||||||||||||
(a) Capital Purchase Obligations - Various capital purchase obligations contain minimum future commitments related to capital expenditures for certain construction projects. IPL’s projects include the construction of Marshalltown, generation performance improvements at Ottumwa Unit 1 and the installation of a scrubber at Lansing Unit 4 to reduce SO2 emissions. WPL’s projects include the installation of a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions. At September 30, 2014, Alliant Energy’s, IPL’s and WPL’s minimum future commitments related to these projects were $45 million, $26 million and $19 million, respectively. | ||||||||||||||||||
(b) Operating Expense Purchase Obligations - Various commodity supply, transportation and storage contracts meet obligations to provide electricity and natural gas to utility customers. Other operating expense purchase obligations with various vendors provide other goods and services. At September 30, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Purchased power (a): | ||||||||||||||||||
DAEC (IPL) | $1,557 | $1,557 | $— | |||||||||||||||
Other | 221 | 1 | 220 | |||||||||||||||
1,778 | 1,558 | 220 | ||||||||||||||||
Natural gas | 341 | 191 | 150 | |||||||||||||||
Coal (b) | 265 | 128 | 137 | |||||||||||||||
SO2 emission allowances | 34 | 34 | — | |||||||||||||||
Other (c) | 20 | 11 | 7 | |||||||||||||||
$2,438 | $1,922 | $514 | ||||||||||||||||
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. | |||||||||||||||||
(b) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of September 30, 2014 regarding expected future usage, which is subject to change. | |||||||||||||||||
(c) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2014. | |||||||||||||||||
(c) Legal Proceedings - | ||||||||||||||||||
Flood Damage Claims - In June 2013, several plaintiffs purporting to represent a class of residential and commercial property owners filed a complaint against CRANDIC, Alliant Energy and various other defendants in the Iowa District Court for Linn County. Plaintiffs assert claims of negligence and strict liability based on their allegations that CRANDIC (along with other defendants) caused or exacerbated flooding of the Cedar River in June 2008. In July 2013, the case was removed from state court to federal court based on federal jurisdiction. In September 2013, the U.S. District Court for the Northern District of Iowa dismissed the Plaintiffs’ claims and transferred the case for resolution to the Surface Transportation Board, the administrative agency that oversees the Interstate Commerce Commission Termination Act. In October 2013, the Plaintiffs appealed the federal court’s dismissal of the case to the Eighth Circuit Court of Appeals. Alliant Energy and CRANDIC believe the case is without merit and will continue to vigorously contest the case. As a result, Alliant Energy does not currently believe any material losses from these claims are both probable and reasonably estimated, and therefore, has not recognized any material loss contingency amounts for this complaint as of September 30, 2014. Due to the early stages of the claim and the lack of specific damages identified, Alliant Energy is currently unable to provide an estimate of potential loss or range of potential loss. | ||||||||||||||||||
(d) Guarantees and Indemnifications - | ||||||||||||||||||
RMT - In 2013, Alliant Energy sold RMT. RMT provided renewable energy services, including construction and high voltage connection services for wind and solar projects. As part of the sale, Alliant Energy indemnified the buyer for any claims, including claims of warranty under the project obligations that were commenced or are based on actions that occurred prior to the sale, except for liabilities already accounted for through adjustments to the purchase price. The indemnification obligations either cease to exist when the statute of limitation for such claims is met or, in the case of RMT’s projects, when the warranty period under the agreements expires. The warranty periods for RMT’s projects generally range from 12 to 60 months with the latest expiring in 2016. | ||||||||||||||||||
Alliant Energy also continues to guarantee RMT’s performance obligations related to certain of RMT’s projects that were commenced prior to Alliant Energy’s sale of RMT. As of September 30, 2014, Alliant Energy had $313 million of performance guarantees outstanding, with $137 million, $53 million and $123 million currently expected to expire in 2014, 2015 and 2016, respectively. The expiration of these performance guarantees may be extended depending on when all valid warranty claims are resolved for the respective projects. | ||||||||||||||||||
Although Alliant Energy has received warranty claims related to certain of these projects, it does not currently believe that material losses are both probable and reasonably estimated, and therefore, has not recognized any material liabilities related to these matters as of September 30, 2014. Due to the early stages of the warranty claims, Alliant Energy is currently unable to provide an estimate of potential loss or range of potential loss. Refer to Note 17 for financial impacts of RMT, including amounts recorded to “Operating expenses” in 2014 related to certain warranty claims. | ||||||||||||||||||
Whiting Petroleum - In 2004, Alliant Energy sold its remaining interest in Whiting Petroleum. Whiting Petroleum is an independent oil and gas company. Alliant Energy continues to guarantee the obligations related to the abandonment of certain platforms off the coast of California and related onshore plant and equipment that were owned by Whiting Petroleum prior to Alliant Energy’s sale of Whiting Petroleum. The guarantee does not include a maximum limit. As of September 30, 2014, the present value of the abandonment obligations is estimated at $31 million. Alliant Energy believes that no payments will be made under this guarantee. Alliant Energy has not recognized any material liabilities related to this guarantee as of September 30, 2014. | ||||||||||||||||||
(e) Environmental Matters - | ||||||||||||||||||
MGP Sites - IPL and WPL have current or previous ownership interests in various sites that are previously associated with the production of gas for which IPL and WPL have, or may have in the future, liability for investigation, remediation and monitoring costs. IPL and WPL are working pursuant to the requirements of various federal and state agencies to investigate, mitigate, prevent and remediate, where necessary, the environmental impacts to property, including natural resources, at and around these former MGP sites in order to protect public health and the environment. IPL and WPL are currently monitoring and/or remediating 26 and 5 sites, respectively. | ||||||||||||||||||
Environmental liabilities related to these MGP sites are recorded based upon periodic studies. Such amounts are based on the best current estimate of the remaining amount to be incurred for investigation, remediation and monitoring costs for those sites where the investigation process has been or is substantially completed, and the minimum of the estimated cost range for those sites where the investigation is in its earlier stages. There are inherent uncertainties associated with the estimated remaining costs for MGP projects primarily due to unknown site conditions and potential changes in regulatory agency requirements. It is possible that future cost estimates will be greater than current estimates as the investigation process proceeds and as additional facts become known. The amounts recognized as liabilities are reduced for expenditures incurred and are adjusted as further information develops or circumstances change. Costs of future expenditures for environmental remediation obligations are not discounted. At September 30, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Range of estimated future costs | $13 | - | $32 | $12 | - | $30 | $1 | - | $2 | |||||||||
Current and non-current environmental liabilities | 19 | 17 | 2 | |||||||||||||||
WPL Consent Decree - In 2009, the EPA sent a notice of violation to WPL as an owner and the operator of Edgewater, Nelson Dewey and Columbia alleging that the owners of such EGUs failed to comply with appropriate pre-construction review and permitting requirements and as a result violated the PSD program requirements, Title V Operating Permit requirements of the CAA and the Wisconsin SIP. In 2010, the Sierra Club filed complaints against WPL, as owner and operator of Nelson Dewey and Columbia, and separately as owner and operator of Edgewater, based on allegations that modifications were made at the facilities without complying with the PSD program requirements, Title V Operating Permit requirements of the CAA and state regulatory counterparts contained within the Wisconsin SIP designed to implement the CAA. | ||||||||||||||||||
In April 2013, WPL, along with the other owners of Edgewater and Columbia, entered into a Consent Decree with the EPA and the Sierra Club to resolve the claims relating to Edgewater, Columbia and Nelson Dewey, while admitting no liability. In June 2013, the Consent Decree was approved by the U.S. District Court for the Western District of Wisconsin, thereby resolving all claims against WPL. Under the Consent Decree, WPL is required to install the following emission controls systems: | ||||||||||||||||||
• | SCR system at Edgewater Unit 5 by May 1, 2013 (placed in service in 2012); | |||||||||||||||||
• | Scrubbers and baghouses at Columbia Units 1 and 2 by December 31, 2014 (placed in service in 2014); | |||||||||||||||||
• | Scrubber and baghouse at Edgewater Unit 5 by December 31, 2016; and | |||||||||||||||||
• | SCR system at Columbia Unit 2 by December 31, 2018. | |||||||||||||||||
WPL is also required to fuel switch or retire Nelson Dewey Units 1 and 2 and Edgewater Unit 3 by December 31, 2015, and Edgewater Unit 4 by December 31, 2018. In addition, the Consent Decree establishes emission rate limits for SO2, NOx and particulate matter for Columbia Units 1 and 2, Nelson Dewey Units 1 and 2 and Edgewater Units 4 and 5. The Consent Decree also includes annual plant-wide emission caps for SO2 and NOx for Columbia, Edgewater and Nelson Dewey. In addition, WPL will complete approximately $7 million in environmental mitigation projects. | ||||||||||||||||||
Final recovery of the costs expected to be incurred related to the Consent Decree will be decided by the PSCW in future rate cases or other proceedings. Alliant Energy and WPL currently expect to recover any material costs incurred by WPL related to compliance with the terms of the Consent Decree from WPL’s electric customers, except for costs related to certain of the environmental mitigation projects. | ||||||||||||||||||
Other Environmental Contingencies - In addition to the environmental liabilities discussed above, various environmental regulations are being monitored that may have a significant impact on future operations. Several of these environmental regulations are subject to legal challenges, reconsideration and/or other uncertainties. Given uncertainties regarding the outcome, timing and compliance plans for these environmental matters, the complete financial impact of these regulations are not able to be determined; however future capital investments and/or modifications to EGUs to comply with these regulations could be significant. Specific current, proposed or potential environmental matters that may require significant future expenditures include, among others: CSAPR, Clean Air Visibility Rule, Mercury and Air Toxic Standard Rule, Wisconsin State Mercury Rule, Industrial Boiler and Process Heater Maximum Achievable Control Technology Rule, Ozone NAAQS Rule, Federal Clean Water Act including Section 316(b), Hydroelectric Fish Passage Device, Effluent Limitation Guidelines, Coal Combustion Residuals, and various legislation and EPA regulations to monitor and regulate the emission of GHG, including carbon emissions from new and existing fossil-fueled EGUs. Some recent developments concerning these environmental matters are included below: | ||||||||||||||||||
Air Quality - | ||||||||||||||||||
CSAPR is an emissions trading program that requires SO2 and NOx emissions reductions at certain of IPL’s and WPL’s fossil-fueled EGUs through installation of emission controls and/or purchases of allowances. Compliance with emissions limits is currently anticipated to begin in 2015, with additional emissions limits reductions beginning in 2017. | ||||||||||||||||||
Clean Power Plan - Existing Fossil-fueled EGUs - In June 2014, the EPA issued proposed standards to reduce CO2 emissions from existing fossil-fueled EGUs. The EPA is proposing a two-part goal structure: an “interim goal” that each state meets an average threshold over the period from 2020 through 2029, and a “final goal” based on a three-year rolling average that each state meets beginning in 2030. State plans that provide details of how these guidelines are to be met would be required by June 30, 2016. The EPA’s proposal allows for a one-year extension to submit state-only plans and a two-year extension if a state elects to join a regional multi-state program. The EPA is currently expected to issue final standards by June 1, 2015. | ||||||||||||||||||
Water Quality - | ||||||||||||||||||
Section 316(b) of the Federal Clean Water Act - In August 2014, the EPA published a final rule to regulate cooling water intake structures and minimize adverse environmental impacts to fish and other aquatic life. Compliance with this final rule is required by the end of 2022. | ||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||
Commitments and Contingencies Disclosure | ' | |||||||||||||||||
COMMITMENTS AND CONTINGENCIES | ||||||||||||||||||
(a) Capital Purchase Obligations - Various capital purchase obligations contain minimum future commitments related to capital expenditures for certain construction projects. IPL’s projects include the construction of Marshalltown, generation performance improvements at Ottumwa Unit 1 and the installation of a scrubber at Lansing Unit 4 to reduce SO2 emissions. WPL’s projects include the installation of a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions. At September 30, 2014, Alliant Energy’s, IPL’s and WPL’s minimum future commitments related to these projects were $45 million, $26 million and $19 million, respectively. | ||||||||||||||||||
(b) Operating Expense Purchase Obligations - Various commodity supply, transportation and storage contracts meet obligations to provide electricity and natural gas to utility customers. Other operating expense purchase obligations with various vendors provide other goods and services. At September 30, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Purchased power (a): | ||||||||||||||||||
DAEC (IPL) | $1,557 | $1,557 | $— | |||||||||||||||
Other | 221 | 1 | 220 | |||||||||||||||
1,778 | 1,558 | 220 | ||||||||||||||||
Natural gas | 341 | 191 | 150 | |||||||||||||||
Coal (b) | 265 | 128 | 137 | |||||||||||||||
SO2 emission allowances | 34 | 34 | — | |||||||||||||||
Other (c) | 20 | 11 | 7 | |||||||||||||||
$2,438 | $1,922 | $514 | ||||||||||||||||
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. | |||||||||||||||||
(b) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of September 30, 2014 regarding expected future usage, which is subject to change. | |||||||||||||||||
(c) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2014. | |||||||||||||||||
(c) Legal Proceedings - | ||||||||||||||||||
Flood Damage Claims - In June 2013, several plaintiffs purporting to represent a class of residential and commercial property owners filed a complaint against CRANDIC, Alliant Energy and various other defendants in the Iowa District Court for Linn County. Plaintiffs assert claims of negligence and strict liability based on their allegations that CRANDIC (along with other defendants) caused or exacerbated flooding of the Cedar River in June 2008. In July 2013, the case was removed from state court to federal court based on federal jurisdiction. In September 2013, the U.S. District Court for the Northern District of Iowa dismissed the Plaintiffs’ claims and transferred the case for resolution to the Surface Transportation Board, the administrative agency that oversees the Interstate Commerce Commission Termination Act. In October 2013, the Plaintiffs appealed the federal court’s dismissal of the case to the Eighth Circuit Court of Appeals. Alliant Energy and CRANDIC believe the case is without merit and will continue to vigorously contest the case. As a result, Alliant Energy does not currently believe any material losses from these claims are both probable and reasonably estimated, and therefore, has not recognized any material loss contingency amounts for this complaint as of September 30, 2014. Due to the early stages of the claim and the lack of specific damages identified, Alliant Energy is currently unable to provide an estimate of potential loss or range of potential loss. | ||||||||||||||||||
(d) Guarantees and Indemnifications - | ||||||||||||||||||
RMT - In 2013, Alliant Energy sold RMT. RMT provided renewable energy services, including construction and high voltage connection services for wind and solar projects. As part of the sale, Alliant Energy indemnified the buyer for any claims, including claims of warranty under the project obligations that were commenced or are based on actions that occurred prior to the sale, except for liabilities already accounted for through adjustments to the purchase price. The indemnification obligations either cease to exist when the statute of limitation for such claims is met or, in the case of RMT’s projects, when the warranty period under the agreements expires. The warranty periods for RMT’s projects generally range from 12 to 60 months with the latest expiring in 2016. | ||||||||||||||||||
Alliant Energy also continues to guarantee RMT’s performance obligations related to certain of RMT’s projects that were commenced prior to Alliant Energy’s sale of RMT. As of September 30, 2014, Alliant Energy had $313 million of performance guarantees outstanding, with $137 million, $53 million and $123 million currently expected to expire in 2014, 2015 and 2016, respectively. The expiration of these performance guarantees may be extended depending on when all valid warranty claims are resolved for the respective projects. | ||||||||||||||||||
Although Alliant Energy has received warranty claims related to certain of these projects, it does not currently believe that material losses are both probable and reasonably estimated, and therefore, has not recognized any material liabilities related to these matters as of September 30, 2014. Due to the early stages of the warranty claims, Alliant Energy is currently unable to provide an estimate of potential loss or range of potential loss. Refer to Note 17 for financial impacts of RMT, including amounts recorded to “Operating expenses” in 2014 related to certain warranty claims. | ||||||||||||||||||
Whiting Petroleum - In 2004, Alliant Energy sold its remaining interest in Whiting Petroleum. Whiting Petroleum is an independent oil and gas company. Alliant Energy continues to guarantee the obligations related to the abandonment of certain platforms off the coast of California and related onshore plant and equipment that were owned by Whiting Petroleum prior to Alliant Energy’s sale of Whiting Petroleum. The guarantee does not include a maximum limit. As of September 30, 2014, the present value of the abandonment obligations is estimated at $31 million. Alliant Energy believes that no payments will be made under this guarantee. Alliant Energy has not recognized any material liabilities related to this guarantee as of September 30, 2014. | ||||||||||||||||||
(e) Environmental Matters - | ||||||||||||||||||
MGP Sites - IPL and WPL have current or previous ownership interests in various sites that are previously associated with the production of gas for which IPL and WPL have, or may have in the future, liability for investigation, remediation and monitoring costs. IPL and WPL are working pursuant to the requirements of various federal and state agencies to investigate, mitigate, prevent and remediate, where necessary, the environmental impacts to property, including natural resources, at and around these former MGP sites in order to protect public health and the environment. IPL and WPL are currently monitoring and/or remediating 26 and 5 sites, respectively. | ||||||||||||||||||
Environmental liabilities related to these MGP sites are recorded based upon periodic studies. Such amounts are based on the best current estimate of the remaining amount to be incurred for investigation, remediation and monitoring costs for those sites where the investigation process has been or is substantially completed, and the minimum of the estimated cost range for those sites where the investigation is in its earlier stages. There are inherent uncertainties associated with the estimated remaining costs for MGP projects primarily due to unknown site conditions and potential changes in regulatory agency requirements. It is possible that future cost estimates will be greater than current estimates as the investigation process proceeds and as additional facts become known. The amounts recognized as liabilities are reduced for expenditures incurred and are adjusted as further information develops or circumstances change. Costs of future expenditures for environmental remediation obligations are not discounted. At September 30, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Range of estimated future costs | $13 | - | $32 | $12 | - | $30 | $1 | - | $2 | |||||||||
Current and non-current environmental liabilities | 19 | 17 | 2 | |||||||||||||||
WPL Consent Decree - In 2009, the EPA sent a notice of violation to WPL as an owner and the operator of Edgewater, Nelson Dewey and Columbia alleging that the owners of such EGUs failed to comply with appropriate pre-construction review and permitting requirements and as a result violated the PSD program requirements, Title V Operating Permit requirements of the CAA and the Wisconsin SIP. In 2010, the Sierra Club filed complaints against WPL, as owner and operator of Nelson Dewey and Columbia, and separately as owner and operator of Edgewater, based on allegations that modifications were made at the facilities without complying with the PSD program requirements, Title V Operating Permit requirements of the CAA and state regulatory counterparts contained within the Wisconsin SIP designed to implement the CAA. | ||||||||||||||||||
In April 2013, WPL, along with the other owners of Edgewater and Columbia, entered into a Consent Decree with the EPA and the Sierra Club to resolve the claims relating to Edgewater, Columbia and Nelson Dewey, while admitting no liability. In June 2013, the Consent Decree was approved by the U.S. District Court for the Western District of Wisconsin, thereby resolving all claims against WPL. Under the Consent Decree, WPL is required to install the following emission controls systems: | ||||||||||||||||||
• | SCR system at Edgewater Unit 5 by May 1, 2013 (placed in service in 2012); | |||||||||||||||||
• | Scrubbers and baghouses at Columbia Units 1 and 2 by December 31, 2014 (placed in service in 2014); | |||||||||||||||||
• | Scrubber and baghouse at Edgewater Unit 5 by December 31, 2016; and | |||||||||||||||||
• | SCR system at Columbia Unit 2 by December 31, 2018. | |||||||||||||||||
WPL is also required to fuel switch or retire Nelson Dewey Units 1 and 2 and Edgewater Unit 3 by December 31, 2015, and Edgewater Unit 4 by December 31, 2018. In addition, the Consent Decree establishes emission rate limits for SO2, NOx and particulate matter for Columbia Units 1 and 2, Nelson Dewey Units 1 and 2 and Edgewater Units 4 and 5. The Consent Decree also includes annual plant-wide emission caps for SO2 and NOx for Columbia, Edgewater and Nelson Dewey. In addition, WPL will complete approximately $7 million in environmental mitigation projects. | ||||||||||||||||||
Final recovery of the costs expected to be incurred related to the Consent Decree will be decided by the PSCW in future rate cases or other proceedings. Alliant Energy and WPL currently expect to recover any material costs incurred by WPL related to compliance with the terms of the Consent Decree from WPL’s electric customers, except for costs related to certain of the environmental mitigation projects. | ||||||||||||||||||
Other Environmental Contingencies - In addition to the environmental liabilities discussed above, various environmental regulations are being monitored that may have a significant impact on future operations. Several of these environmental regulations are subject to legal challenges, reconsideration and/or other uncertainties. Given uncertainties regarding the outcome, timing and compliance plans for these environmental matters, the complete financial impact of these regulations are not able to be determined; however future capital investments and/or modifications to EGUs to comply with these regulations could be significant. Specific current, proposed or potential environmental matters that may require significant future expenditures include, among others: CSAPR, Clean Air Visibility Rule, Mercury and Air Toxic Standard Rule, Wisconsin State Mercury Rule, Industrial Boiler and Process Heater Maximum Achievable Control Technology Rule, Ozone NAAQS Rule, Federal Clean Water Act including Section 316(b), Hydroelectric Fish Passage Device, Effluent Limitation Guidelines, Coal Combustion Residuals, and various legislation and EPA regulations to monitor and regulate the emission of GHG, including carbon emissions from new and existing fossil-fueled EGUs. Some recent developments concerning these environmental matters are included below: | ||||||||||||||||||
Air Quality - | ||||||||||||||||||
CSAPR is an emissions trading program that requires SO2 and NOx emissions reductions at certain of IPL’s and WPL’s fossil-fueled EGUs through installation of emission controls and/or purchases of allowances. Compliance with emissions limits is currently anticipated to begin in 2015, with additional emissions limits reductions beginning in 2017. | ||||||||||||||||||
Clean Power Plan - Existing Fossil-fueled EGUs - In June 2014, the EPA issued proposed standards to reduce CO2 emissions from existing fossil-fueled EGUs. The EPA is proposing a two-part goal structure: an “interim goal” that each state meets an average threshold over the period from 2020 through 2029, and a “final goal” based on a three-year rolling average that each state meets beginning in 2030. State plans that provide details of how these guidelines are to be met would be required by June 30, 2016. The EPA’s proposal allows for a one-year extension to submit state-only plans and a two-year extension if a state elects to join a regional multi-state program. The EPA is currently expected to issue final standards by June 1, 2015. | ||||||||||||||||||
Water Quality - | ||||||||||||||||||
Section 316(b) of the Federal Clean Water Act - In August 2014, the EPA published a final rule to regulate cooling water intake structures and minimize adverse environmental impacts to fish and other aquatic life. Compliance with this final rule is required by the end of 2022. | ||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||
Commitments and Contingencies Disclosure | ' | |||||||||||||||||
COMMITMENTS AND CONTINGENCIES | ||||||||||||||||||
(a) Capital Purchase Obligations - Various capital purchase obligations contain minimum future commitments related to capital expenditures for certain construction projects. IPL’s projects include the construction of Marshalltown, generation performance improvements at Ottumwa Unit 1 and the installation of a scrubber at Lansing Unit 4 to reduce SO2 emissions. WPL’s projects include the installation of a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions. At September 30, 2014, Alliant Energy’s, IPL’s and WPL’s minimum future commitments related to these projects were $45 million, $26 million and $19 million, respectively. | ||||||||||||||||||
(b) Operating Expense Purchase Obligations - Various commodity supply, transportation and storage contracts meet obligations to provide electricity and natural gas to utility customers. Other operating expense purchase obligations with various vendors provide other goods and services. At September 30, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Purchased power (a): | ||||||||||||||||||
DAEC (IPL) | $1,557 | $1,557 | $— | |||||||||||||||
Other | 221 | 1 | 220 | |||||||||||||||
1,778 | 1,558 | 220 | ||||||||||||||||
Natural gas | 341 | 191 | 150 | |||||||||||||||
Coal (b) | 265 | 128 | 137 | |||||||||||||||
SO2 emission allowances | 34 | 34 | — | |||||||||||||||
Other (c) | 20 | 11 | 7 | |||||||||||||||
$2,438 | $1,922 | $514 | ||||||||||||||||
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. | |||||||||||||||||
(b) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of September 30, 2014 regarding expected future usage, which is subject to change. | |||||||||||||||||
(c) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2014. | |||||||||||||||||
(c) Legal Proceedings - | ||||||||||||||||||
Flood Damage Claims - In June 2013, several plaintiffs purporting to represent a class of residential and commercial property owners filed a complaint against CRANDIC, Alliant Energy and various other defendants in the Iowa District Court for Linn County. Plaintiffs assert claims of negligence and strict liability based on their allegations that CRANDIC (along with other defendants) caused or exacerbated flooding of the Cedar River in June 2008. In July 2013, the case was removed from state court to federal court based on federal jurisdiction. In September 2013, the U.S. District Court for the Northern District of Iowa dismissed the Plaintiffs’ claims and transferred the case for resolution to the Surface Transportation Board, the administrative agency that oversees the Interstate Commerce Commission Termination Act. In October 2013, the Plaintiffs appealed the federal court’s dismissal of the case to the Eighth Circuit Court of Appeals. Alliant Energy and CRANDIC believe the case is without merit and will continue to vigorously contest the case. As a result, Alliant Energy does not currently believe any material losses from these claims are both probable and reasonably estimated, and therefore, has not recognized any material loss contingency amounts for this complaint as of September 30, 2014. Due to the early stages of the claim and the lack of specific damages identified, Alliant Energy is currently unable to provide an estimate of potential loss or range of potential loss. | ||||||||||||||||||
(d) Guarantees and Indemnifications - | ||||||||||||||||||
RMT - In 2013, Alliant Energy sold RMT. RMT provided renewable energy services, including construction and high voltage connection services for wind and solar projects. As part of the sale, Alliant Energy indemnified the buyer for any claims, including claims of warranty under the project obligations that were commenced or are based on actions that occurred prior to the sale, except for liabilities already accounted for through adjustments to the purchase price. The indemnification obligations either cease to exist when the statute of limitation for such claims is met or, in the case of RMT’s projects, when the warranty period under the agreements expires. The warranty periods for RMT’s projects generally range from 12 to 60 months with the latest expiring in 2016. | ||||||||||||||||||
Alliant Energy also continues to guarantee RMT’s performance obligations related to certain of RMT’s projects that were commenced prior to Alliant Energy’s sale of RMT. As of September 30, 2014, Alliant Energy had $313 million of performance guarantees outstanding, with $137 million, $53 million and $123 million currently expected to expire in 2014, 2015 and 2016, respectively. The expiration of these performance guarantees may be extended depending on when all valid warranty claims are resolved for the respective projects. | ||||||||||||||||||
Although Alliant Energy has received warranty claims related to certain of these projects, it does not currently believe that material losses are both probable and reasonably estimated, and therefore, has not recognized any material liabilities related to these matters as of September 30, 2014. Due to the early stages of the warranty claims, Alliant Energy is currently unable to provide an estimate of potential loss or range of potential loss. Refer to Note 17 for financial impacts of RMT, including amounts recorded to “Operating expenses” in 2014 related to certain warranty claims. | ||||||||||||||||||
Whiting Petroleum - In 2004, Alliant Energy sold its remaining interest in Whiting Petroleum. Whiting Petroleum is an independent oil and gas company. Alliant Energy continues to guarantee the obligations related to the abandonment of certain platforms off the coast of California and related onshore plant and equipment that were owned by Whiting Petroleum prior to Alliant Energy’s sale of Whiting Petroleum. The guarantee does not include a maximum limit. As of September 30, 2014, the present value of the abandonment obligations is estimated at $31 million. Alliant Energy believes that no payments will be made under this guarantee. Alliant Energy has not recognized any material liabilities related to this guarantee as of September 30, 2014. | ||||||||||||||||||
(e) Environmental Matters - | ||||||||||||||||||
MGP Sites - IPL and WPL have current or previous ownership interests in various sites that are previously associated with the production of gas for which IPL and WPL have, or may have in the future, liability for investigation, remediation and monitoring costs. IPL and WPL are working pursuant to the requirements of various federal and state agencies to investigate, mitigate, prevent and remediate, where necessary, the environmental impacts to property, including natural resources, at and around these former MGP sites in order to protect public health and the environment. IPL and WPL are currently monitoring and/or remediating 26 and 5 sites, respectively. | ||||||||||||||||||
Environmental liabilities related to these MGP sites are recorded based upon periodic studies. Such amounts are based on the best current estimate of the remaining amount to be incurred for investigation, remediation and monitoring costs for those sites where the investigation process has been or is substantially completed, and the minimum of the estimated cost range for those sites where the investigation is in its earlier stages. There are inherent uncertainties associated with the estimated remaining costs for MGP projects primarily due to unknown site conditions and potential changes in regulatory agency requirements. It is possible that future cost estimates will be greater than current estimates as the investigation process proceeds and as additional facts become known. The amounts recognized as liabilities are reduced for expenditures incurred and are adjusted as further information develops or circumstances change. Costs of future expenditures for environmental remediation obligations are not discounted. At September 30, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Range of estimated future costs | $13 | - | $32 | $12 | - | $30 | $1 | - | $2 | |||||||||
Current and non-current environmental liabilities | 19 | 17 | 2 | |||||||||||||||
WPL Consent Decree - In 2009, the EPA sent a notice of violation to WPL as an owner and the operator of Edgewater, Nelson Dewey and Columbia alleging that the owners of such EGUs failed to comply with appropriate pre-construction review and permitting requirements and as a result violated the PSD program requirements, Title V Operating Permit requirements of the CAA and the Wisconsin SIP. In 2010, the Sierra Club filed complaints against WPL, as owner and operator of Nelson Dewey and Columbia, and separately as owner and operator of Edgewater, based on allegations that modifications were made at the facilities without complying with the PSD program requirements, Title V Operating Permit requirements of the CAA and state regulatory counterparts contained within the Wisconsin SIP designed to implement the CAA. | ||||||||||||||||||
In April 2013, WPL, along with the other owners of Edgewater and Columbia, entered into a Consent Decree with the EPA and the Sierra Club to resolve the claims relating to Edgewater, Columbia and Nelson Dewey, while admitting no liability. In June 2013, the Consent Decree was approved by the U.S. District Court for the Western District of Wisconsin, thereby resolving all claims against WPL. Under the Consent Decree, WPL is required to install the following emission controls systems: | ||||||||||||||||||
• | SCR system at Edgewater Unit 5 by May 1, 2013 (placed in service in 2012); | |||||||||||||||||
• | Scrubbers and baghouses at Columbia Units 1 and 2 by December 31, 2014 (placed in service in 2014); | |||||||||||||||||
• | Scrubber and baghouse at Edgewater Unit 5 by December 31, 2016; and | |||||||||||||||||
• | SCR system at Columbia Unit 2 by December 31, 2018. | |||||||||||||||||
WPL is also required to fuel switch or retire Nelson Dewey Units 1 and 2 and Edgewater Unit 3 by December 31, 2015, and Edgewater Unit 4 by December 31, 2018. In addition, the Consent Decree establishes emission rate limits for SO2, NOx and particulate matter for Columbia Units 1 and 2, Nelson Dewey Units 1 and 2 and Edgewater Units 4 and 5. The Consent Decree also includes annual plant-wide emission caps for SO2 and NOx for Columbia, Edgewater and Nelson Dewey. In addition, WPL will complete approximately $7 million in environmental mitigation projects. | ||||||||||||||||||
Final recovery of the costs expected to be incurred related to the Consent Decree will be decided by the PSCW in future rate cases or other proceedings. Alliant Energy and WPL currently expect to recover any material costs incurred by WPL related to compliance with the terms of the Consent Decree from WPL’s electric customers, except for costs related to certain of the environmental mitigation projects. | ||||||||||||||||||
Other Environmental Contingencies - In addition to the environmental liabilities discussed above, various environmental regulations are being monitored that may have a significant impact on future operations. Several of these environmental regulations are subject to legal challenges, reconsideration and/or other uncertainties. Given uncertainties regarding the outcome, timing and compliance plans for these environmental matters, the complete financial impact of these regulations are not able to be determined; however future capital investments and/or modifications to EGUs to comply with these regulations could be significant. Specific current, proposed or potential environmental matters that may require significant future expenditures include, among others: CSAPR, Clean Air Visibility Rule, Mercury and Air Toxic Standard Rule, Wisconsin State Mercury Rule, Industrial Boiler and Process Heater Maximum Achievable Control Technology Rule, Ozone NAAQS Rule, Federal Clean Water Act including Section 316(b), Hydroelectric Fish Passage Device, Effluent Limitation Guidelines, Coal Combustion Residuals, and various legislation and EPA regulations to monitor and regulate the emission of GHG, including carbon emissions from new and existing fossil-fueled EGUs. Some recent developments concerning these environmental matters are included below: | ||||||||||||||||||
Air Quality - | ||||||||||||||||||
CSAPR is an emissions trading program that requires SO2 and NOx emissions reductions at certain of IPL’s and WPL’s fossil-fueled EGUs through installation of emission controls and/or purchases of allowances. Compliance with emissions limits is currently anticipated to begin in 2015, with additional emissions limits reductions beginning in 2017. | ||||||||||||||||||
Clean Power Plan - Existing Fossil-fueled EGUs - In June 2014, the EPA issued proposed standards to reduce CO2 emissions from existing fossil-fueled EGUs. The EPA is proposing a two-part goal structure: an “interim goal” that each state meets an average threshold over the period from 2020 through 2029, and a “final goal” based on a three-year rolling average that each state meets beginning in 2030. State plans that provide details of how these guidelines are to be met would be required by June 30, 2016. The EPA’s proposal allows for a one-year extension to submit state-only plans and a two-year extension if a state elects to join a regional multi-state program. The EPA is currently expected to issue final standards by June 1, 2015. | ||||||||||||||||||
Water Quality - | ||||||||||||||||||
Section 316(b) of the Federal Clean Water Act - In August 2014, the EPA published a final rule to regulate cooling water intake structures and minimize adverse environmental impacts to fish and other aquatic life. Compliance with this final rule is required by the end of 2022. |
Segments_Of_Business
Segments Of Business | 9 Months Ended | |||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||
Segment Reporting Information [Line Items] | ' | |||||||||||||||||||||||
Segments Of Business | ' | |||||||||||||||||||||||
SEGMENTS OF BUSINESS | ||||||||||||||||||||||||
Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations. | ||||||||||||||||||||||||
Utilities | Non-Regulated, | Alliant Energy | ||||||||||||||||||||||
Electric | Gas | Other | Total | Parent and Other | Consolidated | |||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $771.20 | $47.20 | $12.20 | $830.60 | $12.50 | $843.10 | ||||||||||||||||||
Operating income (loss) | 190.8 | (4.4 | ) | 1.4 | 187.8 | 7 | 194.8 | |||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income (loss) from continuing operations, net of tax | 164.1 | (8.9 | ) | 155.2 | ||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (1.9 | ) | (1.9 | ) | |||||||||||||||||||
Net income (loss) attributable to Alliant Energy common shareowners | 164.1 | (10.8 | ) | 153.3 | ||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $798.10 | $39.80 | $17.40 | $855.30 | $11.30 | $866.60 | ||||||||||||||||||
Operating income (loss) | 199.6 | (3.4 | ) | (0.3 | ) | 195.9 | 5.5 | 201.4 | ||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income (loss) from continuing operations, net of tax | 171.3 | (12.4 | ) | 158.9 | ||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (1.3 | ) | (1.3 | ) | |||||||||||||||||||
Net income (loss) attributable to Alliant Energy common shareowners | 171.3 | (13.7 | ) | 157.6 | ||||||||||||||||||||
Utilities | Non-Regulated, | Alliant Energy | ||||||||||||||||||||||
Electric | Gas | Other | Total | Parent and Other | Consolidated | |||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $2,090.90 | $364.80 | $50.60 | $2,506.30 | $39.90 | $2,546.20 | ||||||||||||||||||
Operating income | 374.2 | 41.3 | 11.5 | 427 | 25.3 | 452.3 | ||||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income from continuing operations, net of tax | 315.3 | 10 | 325.3 | |||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (2.2 | ) | (2.2 | ) | |||||||||||||||||||
Net income attributable to Alliant Energy common shareowners | 315.3 | 7.8 | 323.1 | |||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $2,043.40 | $310.50 | $52.40 | $2,406.30 | $37.90 | $2,444.20 | ||||||||||||||||||
Operating income | 359.1 | 39.5 | 5.5 | 404.1 | 21.2 | 425.3 | ||||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income from continuing operations, net of tax | 292.8 | 4.9 | 297.7 | |||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (4.9 | ) | (4.9 | ) | |||||||||||||||||||
Net income attributable to Alliant Energy common shareowners | 292.8 | — | 292.8 | |||||||||||||||||||||
IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations. | ||||||||||||||||||||||||
Electric | Gas | Other | Total | |||||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $435.90 | $28.70 | $11.60 | $476.20 | ||||||||||||||||||||
Operating income (loss) | 94.7 | (2.8 | ) | 2 | 93.9 | |||||||||||||||||||
Earnings available for common stock | 102.5 | |||||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $457.60 | $24.60 | $12.20 | $494.40 | ||||||||||||||||||||
Operating income (loss) | 99.6 | (0.7 | ) | 1.1 | 100 | |||||||||||||||||||
Earnings available for common stock | 110 | |||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $1,164.70 | $208.10 | $44.20 | $1,417.00 | ||||||||||||||||||||
Operating income | 150.2 | 22.1 | 13.1 | 185.4 | ||||||||||||||||||||
Earnings available for common stock | 164.3 | |||||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $1,137.40 | $180.90 | $37.40 | $1,355.70 | ||||||||||||||||||||
Operating income | 146.2 | 22.6 | 7 | 175.8 | ||||||||||||||||||||
Earnings available for common stock | 155.1 | |||||||||||||||||||||||
WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations. | ||||||||||||||||||||||||
Electric | Gas | Other | Total | |||||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $335.30 | $18.50 | $0.60 | $354.40 | ||||||||||||||||||||
Operating income (loss) | 96.1 | (1.6 | ) | (0.6 | ) | 93.9 | ||||||||||||||||||
Earnings available for common stock | 61.6 | |||||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $340.50 | $15.20 | $5.20 | $360.90 | ||||||||||||||||||||
Operating income (loss) | 100 | (2.7 | ) | (1.4 | ) | 95.9 | ||||||||||||||||||
Earnings available for common stock | 61.3 | |||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $926.20 | $156.70 | $6.40 | $1,089.30 | ||||||||||||||||||||
Operating income (loss) | 224 | 19.2 | (1.6 | ) | 241.6 | |||||||||||||||||||
Earnings available for common stock | 151 | |||||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $906.00 | $129.60 | $15.00 | $1,050.60 | ||||||||||||||||||||
Operating income (loss) | 212.9 | 16.9 | (1.5 | ) | 228.3 | |||||||||||||||||||
Earnings available for common stock | 137.7 | |||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||
Segment Reporting Information [Line Items] | ' | |||||||||||||||||||||||
Segments Of Business | ' | |||||||||||||||||||||||
SEGMENTS OF BUSINESS | ||||||||||||||||||||||||
Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations. | ||||||||||||||||||||||||
Utilities | Non-Regulated, | Alliant Energy | ||||||||||||||||||||||
Electric | Gas | Other | Total | Parent and Other | Consolidated | |||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $771.20 | $47.20 | $12.20 | $830.60 | $12.50 | $843.10 | ||||||||||||||||||
Operating income (loss) | 190.8 | (4.4 | ) | 1.4 | 187.8 | 7 | 194.8 | |||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income (loss) from continuing operations, net of tax | 164.1 | (8.9 | ) | 155.2 | ||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (1.9 | ) | (1.9 | ) | |||||||||||||||||||
Net income (loss) attributable to Alliant Energy common shareowners | 164.1 | (10.8 | ) | 153.3 | ||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $798.10 | $39.80 | $17.40 | $855.30 | $11.30 | $866.60 | ||||||||||||||||||
Operating income (loss) | 199.6 | (3.4 | ) | (0.3 | ) | 195.9 | 5.5 | 201.4 | ||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income (loss) from continuing operations, net of tax | 171.3 | (12.4 | ) | 158.9 | ||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (1.3 | ) | (1.3 | ) | |||||||||||||||||||
Net income (loss) attributable to Alliant Energy common shareowners | 171.3 | (13.7 | ) | 157.6 | ||||||||||||||||||||
Utilities | Non-Regulated, | Alliant Energy | ||||||||||||||||||||||
Electric | Gas | Other | Total | Parent and Other | Consolidated | |||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $2,090.90 | $364.80 | $50.60 | $2,506.30 | $39.90 | $2,546.20 | ||||||||||||||||||
Operating income | 374.2 | 41.3 | 11.5 | 427 | 25.3 | 452.3 | ||||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income from continuing operations, net of tax | 315.3 | 10 | 325.3 | |||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (2.2 | ) | (2.2 | ) | |||||||||||||||||||
Net income attributable to Alliant Energy common shareowners | 315.3 | 7.8 | 323.1 | |||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $2,043.40 | $310.50 | $52.40 | $2,406.30 | $37.90 | $2,444.20 | ||||||||||||||||||
Operating income | 359.1 | 39.5 | 5.5 | 404.1 | 21.2 | 425.3 | ||||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income from continuing operations, net of tax | 292.8 | 4.9 | 297.7 | |||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (4.9 | ) | (4.9 | ) | |||||||||||||||||||
Net income attributable to Alliant Energy common shareowners | 292.8 | — | 292.8 | |||||||||||||||||||||
IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations. | ||||||||||||||||||||||||
Electric | Gas | Other | Total | |||||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $435.90 | $28.70 | $11.60 | $476.20 | ||||||||||||||||||||
Operating income (loss) | 94.7 | (2.8 | ) | 2 | 93.9 | |||||||||||||||||||
Earnings available for common stock | 102.5 | |||||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $457.60 | $24.60 | $12.20 | $494.40 | ||||||||||||||||||||
Operating income (loss) | 99.6 | (0.7 | ) | 1.1 | 100 | |||||||||||||||||||
Earnings available for common stock | 110 | |||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $1,164.70 | $208.10 | $44.20 | $1,417.00 | ||||||||||||||||||||
Operating income | 150.2 | 22.1 | 13.1 | 185.4 | ||||||||||||||||||||
Earnings available for common stock | 164.3 | |||||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $1,137.40 | $180.90 | $37.40 | $1,355.70 | ||||||||||||||||||||
Operating income | 146.2 | 22.6 | 7 | 175.8 | ||||||||||||||||||||
Earnings available for common stock | 155.1 | |||||||||||||||||||||||
WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations. | ||||||||||||||||||||||||
Electric | Gas | Other | Total | |||||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $335.30 | $18.50 | $0.60 | $354.40 | ||||||||||||||||||||
Operating income (loss) | 96.1 | (1.6 | ) | (0.6 | ) | 93.9 | ||||||||||||||||||
Earnings available for common stock | 61.6 | |||||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $340.50 | $15.20 | $5.20 | $360.90 | ||||||||||||||||||||
Operating income (loss) | 100 | (2.7 | ) | (1.4 | ) | 95.9 | ||||||||||||||||||
Earnings available for common stock | 61.3 | |||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $926.20 | $156.70 | $6.40 | $1,089.30 | ||||||||||||||||||||
Operating income (loss) | 224 | 19.2 | (1.6 | ) | 241.6 | |||||||||||||||||||
Earnings available for common stock | 151 | |||||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $906.00 | $129.60 | $15.00 | $1,050.60 | ||||||||||||||||||||
Operating income (loss) | 212.9 | 16.9 | (1.5 | ) | 228.3 | |||||||||||||||||||
Earnings available for common stock | 137.7 | |||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||
Segment Reporting Information [Line Items] | ' | |||||||||||||||||||||||
Segments Of Business | ' | |||||||||||||||||||||||
SEGMENTS OF BUSINESS | ||||||||||||||||||||||||
Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations. | ||||||||||||||||||||||||
Utilities | Non-Regulated, | Alliant Energy | ||||||||||||||||||||||
Electric | Gas | Other | Total | Parent and Other | Consolidated | |||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $771.20 | $47.20 | $12.20 | $830.60 | $12.50 | $843.10 | ||||||||||||||||||
Operating income (loss) | 190.8 | (4.4 | ) | 1.4 | 187.8 | 7 | 194.8 | |||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income (loss) from continuing operations, net of tax | 164.1 | (8.9 | ) | 155.2 | ||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (1.9 | ) | (1.9 | ) | |||||||||||||||||||
Net income (loss) attributable to Alliant Energy common shareowners | 164.1 | (10.8 | ) | 153.3 | ||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $798.10 | $39.80 | $17.40 | $855.30 | $11.30 | $866.60 | ||||||||||||||||||
Operating income (loss) | 199.6 | (3.4 | ) | (0.3 | ) | 195.9 | 5.5 | 201.4 | ||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income (loss) from continuing operations, net of tax | 171.3 | (12.4 | ) | 158.9 | ||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (1.3 | ) | (1.3 | ) | |||||||||||||||||||
Net income (loss) attributable to Alliant Energy common shareowners | 171.3 | (13.7 | ) | 157.6 | ||||||||||||||||||||
Utilities | Non-Regulated, | Alliant Energy | ||||||||||||||||||||||
Electric | Gas | Other | Total | Parent and Other | Consolidated | |||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $2,090.90 | $364.80 | $50.60 | $2,506.30 | $39.90 | $2,546.20 | ||||||||||||||||||
Operating income | 374.2 | 41.3 | 11.5 | 427 | 25.3 | 452.3 | ||||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income from continuing operations, net of tax | 315.3 | 10 | 325.3 | |||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (2.2 | ) | (2.2 | ) | |||||||||||||||||||
Net income attributable to Alliant Energy common shareowners | 315.3 | 7.8 | 323.1 | |||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $2,043.40 | $310.50 | $52.40 | $2,406.30 | $37.90 | $2,444.20 | ||||||||||||||||||
Operating income | 359.1 | 39.5 | 5.5 | 404.1 | 21.2 | 425.3 | ||||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income from continuing operations, net of tax | 292.8 | 4.9 | 297.7 | |||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (4.9 | ) | (4.9 | ) | |||||||||||||||||||
Net income attributable to Alliant Energy common shareowners | 292.8 | — | 292.8 | |||||||||||||||||||||
IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations. | ||||||||||||||||||||||||
Electric | Gas | Other | Total | |||||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $435.90 | $28.70 | $11.60 | $476.20 | ||||||||||||||||||||
Operating income (loss) | 94.7 | (2.8 | ) | 2 | 93.9 | |||||||||||||||||||
Earnings available for common stock | 102.5 | |||||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $457.60 | $24.60 | $12.20 | $494.40 | ||||||||||||||||||||
Operating income (loss) | 99.6 | (0.7 | ) | 1.1 | 100 | |||||||||||||||||||
Earnings available for common stock | 110 | |||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $1,164.70 | $208.10 | $44.20 | $1,417.00 | ||||||||||||||||||||
Operating income | 150.2 | 22.1 | 13.1 | 185.4 | ||||||||||||||||||||
Earnings available for common stock | 164.3 | |||||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $1,137.40 | $180.90 | $37.40 | $1,355.70 | ||||||||||||||||||||
Operating income | 146.2 | 22.6 | 7 | 175.8 | ||||||||||||||||||||
Earnings available for common stock | 155.1 | |||||||||||||||||||||||
WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations. | ||||||||||||||||||||||||
Electric | Gas | Other | Total | |||||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $335.30 | $18.50 | $0.60 | $354.40 | ||||||||||||||||||||
Operating income (loss) | 96.1 | (1.6 | ) | (0.6 | ) | 93.9 | ||||||||||||||||||
Earnings available for common stock | 61.6 | |||||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $340.50 | $15.20 | $5.20 | $360.90 | ||||||||||||||||||||
Operating income (loss) | 100 | (2.7 | ) | (1.4 | ) | 95.9 | ||||||||||||||||||
Earnings available for common stock | 61.3 | |||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $926.20 | $156.70 | $6.40 | $1,089.30 | ||||||||||||||||||||
Operating income (loss) | 224 | 19.2 | (1.6 | ) | 241.6 | |||||||||||||||||||
Earnings available for common stock | 151 | |||||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $906.00 | $129.60 | $15.00 | $1,050.60 | ||||||||||||||||||||
Operating income (loss) | 212.9 | 16.9 | (1.5 | ) | 228.3 | |||||||||||||||||||
Earnings available for common stock | 137.7 | |||||||||||||||||||||||
Related_Parties
Related Parties | 9 Months Ended | |||||||||||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||||||||||
Related Party Transactions [Line Items] | ' | |||||||||||||||||||||||||||||||
Related Parties | ' | |||||||||||||||||||||||||||||||
RELATED PARTIES | ||||||||||||||||||||||||||||||||
Service Agreements - IPL and WPL are parties to service agreements with an affiliate, Corporate Services. Pursuant to these service agreements, IPL and WPL receive various administrative and general services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation and benefits, fees associated with various professional services and a return on net assets. Corporate Services also acts as agent on behalf of IPL and WPL pursuant to the service agreements. As agent, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions within MISO and PJM. Corporate Services assigns such sales and purchases among IPL and WPL based on statements received from MISO and PJM. The amounts billed for services provided, sales credited and purchases billed for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||
Corporate Services billings | $37 | $39 | $111 | $107 | $30 | $28 | $89 | $77 | ||||||||||||||||||||||||
Sales credited | 2 | 2 | 6 | 5 | 2 | 3 | 4 | 10 | ||||||||||||||||||||||||
Purchases billed | 106 | 108 | 313 | 260 | 34 | 16 | 92 | 44 | ||||||||||||||||||||||||
Net intercompany payables to Corporate Services were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||||||||
Net payables to Corporate Services | $87 | $62 | $54 | $46 | ||||||||||||||||||||||||||||
ATC - Pursuant to various agreements, WPL receives a range of transmission services from ATC. WPL provides operation, maintenance, and construction services to ATC. WPL and ATC also bill each other for use of shared facilities owned by each party. The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||||||||||||||||||
Three Months | Nine Months | |||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||
ATC billings to WPL | $24 | $24 | $72 | $72 | ||||||||||||||||||||||||||||
WPL billings to ATC | 3 | 2 | 7 | 9 | ||||||||||||||||||||||||||||
WPL owed ATC net amounts of $7 million as of September 30, 2014 and $8 million as of December 31, 2013. | ||||||||||||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||||||||||
Related Party Transactions [Line Items] | ' | |||||||||||||||||||||||||||||||
Related Parties | ' | |||||||||||||||||||||||||||||||
RELATED PARTIES | ||||||||||||||||||||||||||||||||
Service Agreements - IPL and WPL are parties to service agreements with an affiliate, Corporate Services. Pursuant to these service agreements, IPL and WPL receive various administrative and general services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation and benefits, fees associated with various professional services and a return on net assets. Corporate Services also acts as agent on behalf of IPL and WPL pursuant to the service agreements. As agent, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions within MISO and PJM. Corporate Services assigns such sales and purchases among IPL and WPL based on statements received from MISO and PJM. The amounts billed for services provided, sales credited and purchases billed for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||
Corporate Services billings | $37 | $39 | $111 | $107 | $30 | $28 | $89 | $77 | ||||||||||||||||||||||||
Sales credited | 2 | 2 | 6 | 5 | 2 | 3 | 4 | 10 | ||||||||||||||||||||||||
Purchases billed | 106 | 108 | 313 | 260 | 34 | 16 | 92 | 44 | ||||||||||||||||||||||||
Net intercompany payables to Corporate Services were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||||||||
Net payables to Corporate Services | $87 | $62 | $54 | $46 | ||||||||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||||||||||
Related Party Transactions [Line Items] | ' | |||||||||||||||||||||||||||||||
Related Parties | ' | |||||||||||||||||||||||||||||||
RELATED PARTIES | ||||||||||||||||||||||||||||||||
Service Agreements - IPL and WPL are parties to service agreements with an affiliate, Corporate Services. Pursuant to these service agreements, IPL and WPL receive various administrative and general services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation and benefits, fees associated with various professional services and a return on net assets. Corporate Services also acts as agent on behalf of IPL and WPL pursuant to the service agreements. As agent, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions within MISO and PJM. Corporate Services assigns such sales and purchases among IPL and WPL based on statements received from MISO and PJM. The amounts billed for services provided, sales credited and purchases billed for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||
Corporate Services billings | $37 | $39 | $111 | $107 | $30 | $28 | $89 | $77 | ||||||||||||||||||||||||
Sales credited | 2 | 2 | 6 | 5 | 2 | 3 | 4 | 10 | ||||||||||||||||||||||||
Purchases billed | 106 | 108 | 313 | 260 | 34 | 16 | 92 | 44 | ||||||||||||||||||||||||
Net intercompany payables to Corporate Services were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||||||||
Net payables to Corporate Services | $87 | $62 | $54 | $46 | ||||||||||||||||||||||||||||
ATC - Pursuant to various agreements, WPL receives a range of transmission services from ATC. WPL provides operation, maintenance, and construction services to ATC. WPL and ATC also bill each other for use of shared facilities owned by each party. The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||||||||||||||||||
Three Months | Nine Months | |||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||
ATC billings to WPL | $24 | $24 | $72 | $72 | ||||||||||||||||||||||||||||
WPL billings to ATC | 3 | 2 | 7 | 9 | ||||||||||||||||||||||||||||
WPL owed ATC net amounts of $7 million as of September 30, 2014 and $8 million as of December 31, 2013. |
Discontinued_Operations
Discontinued Operations | 9 Months Ended | |||||||||||||||
Sep. 30, 2014 | ||||||||||||||||
Discontinued Operations and Disposal Groups [Abstract] | ' | |||||||||||||||
Discontinued Operations | ' | |||||||||||||||
DISCONTINUED OPERATIONS | ||||||||||||||||
In January 2013, Alliant Energy sold RMT to narrow its strategic focus and risk profile. The operating results of RMT have been separately classified and reported as discontinued operations in Alliant Energy’s income statements. A summary of the components of discontinued operations in Alliant Energy’s income statements for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||
Three Months | Nine Months | |||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||
Operating revenues | $— | $— | $— | $0.90 | ||||||||||||
Operating expenses | 2.8 | 2.1 | 3.4 | 8.6 | ||||||||||||
Loss before income taxes | (2.8 | ) | (2.1 | ) | (3.4 | ) | (7.7 | ) | ||||||||
Income tax benefit | (0.9 | ) | (0.8 | ) | (1.2 | ) | (2.8 | ) | ||||||||
Loss from discontinued operations, net of tax | ($1.9 | ) | ($1.3 | ) | ($2.2 | ) | ($4.9 | ) | ||||||||
Refer to Note 14(d) for further discussion of RMT. |
Summary_Of_Significant_Account1
Summary Of Significant Accounting Policies (Policy) | 9 Months Ended |
Sep. 30, 2014 | |
Summary of Significant Accounting Policies [Line Items] | ' |
General, Basis of Accounting | ' |
The interim unaudited Financial Statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, although management believes that the disclosures are adequate to make the information presented not misleading. These Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the latest combined Annual Report on Form 10-K. | |
General, Use of Estimates | ' |
In the opinion of management, all adjustments, which unless otherwise noted are normal and recurring in nature, necessary for a fair presentation of the results of operations, financial position and cash flows have been made. Results for the nine months ended September 30, 2014 are not necessarily indicative of results that may be expected for the year ending December 31, 2014. A change in management’s estimates or assumptions could have a material impact on financial condition and results of operations during the period in which such change occurred. | |
General, Reclassification | ' |
Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes. Unless otherwise noted, the Notes herein exclude discontinued operations for all periods presented. | |
New Accounting Pronouncements | ' |
New Accounting Pronouncements - | |
Revenue Recognition - In May 2014, FASB issued an accounting standard providing principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard also requires disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Alliant Energy, IPL and WPL are required to adopt this standard on January 1, 2017 and are currently evaluating the impact on their financial condition and results of operations. | |
Discontinued Operations - In April 2014, FASB issued an accounting standard that changes the criteria for reporting and qualifying for discontinued operations. Under the new standard, a disposal of a component or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operational and financial results. The new standard also requires additional disclosures about discontinued operations and individually significant components of an entity that are disposed of or that are classified as held for sale and do not qualify for discontinued operations. Alliant Energy, IPL and WPL are required to apply the new standard to all prospective disposals subsequent to December 31, 2014. Alliant Energy and IPL are currently evaluating the impact of the new standard on IPL’s anticipated sales of its Minnesota electric and natural gas distribution assets. Early adoption is permitted for disposals that have not been previously classified as held for sale. | |
IPL [Member] | ' |
Summary of Significant Accounting Policies [Line Items] | ' |
General, Basis of Accounting | ' |
The interim unaudited Financial Statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, although management believes that the disclosures are adequate to make the information presented not misleading. These Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the latest combined Annual Report on Form 10-K. | |
General, Use of Estimates | ' |
In the opinion of management, all adjustments, which unless otherwise noted are normal and recurring in nature, necessary for a fair presentation of the results of operations, financial position and cash flows have been made. Results for the nine months ended September 30, 2014 are not necessarily indicative of results that may be expected for the year ending December 31, 2014. A change in management’s estimates or assumptions could have a material impact on financial condition and results of operations during the period in which such change occurred. | |
General, Reclassification | ' |
Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes. Unless otherwise noted, the Notes herein exclude discontinued operations for all periods presented. | |
New Accounting Pronouncements | ' |
New Accounting Pronouncements - | |
Revenue Recognition - In May 2014, FASB issued an accounting standard providing principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard also requires disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Alliant Energy, IPL and WPL are required to adopt this standard on January 1, 2017 and are currently evaluating the impact on their financial condition and results of operations. | |
Discontinued Operations - In April 2014, FASB issued an accounting standard that changes the criteria for reporting and qualifying for discontinued operations. Under the new standard, a disposal of a component or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operational and financial results. The new standard also requires additional disclosures about discontinued operations and individually significant components of an entity that are disposed of or that are classified as held for sale and do not qualify for discontinued operations. Alliant Energy, IPL and WPL are required to apply the new standard to all prospective disposals subsequent to December 31, 2014. Alliant Energy and IPL are currently evaluating the impact of the new standard on IPL’s anticipated sales of its Minnesota electric and natural gas distribution assets. Early adoption is permitted for disposals that have not been previously classified as held for sale. | |
WPL [Member] | ' |
Summary of Significant Accounting Policies [Line Items] | ' |
General, Basis of Accounting | ' |
The interim unaudited Financial Statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, although management believes that the disclosures are adequate to make the information presented not misleading. These Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the latest combined Annual Report on Form 10-K. | |
General, Use of Estimates | ' |
In the opinion of management, all adjustments, which unless otherwise noted are normal and recurring in nature, necessary for a fair presentation of the results of operations, financial position and cash flows have been made. Results for the nine months ended September 30, 2014 are not necessarily indicative of results that may be expected for the year ending December 31, 2014. A change in management’s estimates or assumptions could have a material impact on financial condition and results of operations during the period in which such change occurred. | |
General, Reclassification | ' |
Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes. Unless otherwise noted, the Notes herein exclude discontinued operations for all periods presented. | |
New Accounting Pronouncements | ' |
New Accounting Pronouncements - | |
Revenue Recognition - In May 2014, FASB issued an accounting standard providing principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard also requires disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Alliant Energy, IPL and WPL are required to adopt this standard on January 1, 2017 and are currently evaluating the impact on their financial condition and results of operations. | |
Discontinued Operations - In April 2014, FASB issued an accounting standard that changes the criteria for reporting and qualifying for discontinued operations. Under the new standard, a disposal of a component or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operational and financial results. The new standard also requires additional disclosures about discontinued operations and individually significant components of an entity that are disposed of or that are classified as held for sale and do not qualify for discontinued operations. Alliant Energy, IPL and WPL are required to apply the new standard to all prospective disposals subsequent to December 31, 2014. Alliant Energy and IPL are currently evaluating the impact of the new standard on IPL’s anticipated sales of its Minnesota electric and natural gas distribution assets. Early adoption is permitted for disposals that have not been previously classified as held for sale. |
Regulatory_Matters_Tables
Regulatory Matters (Tables) | 9 Months Ended | |||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||
Regulatory Assets [Line Items] | ' | |||||||||||||||||||||||
Regulatory Assets | ' | |||||||||||||||||||||||
Regulatory assets were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Tax-related | $937.60 | $829.70 | $910.60 | $798.60 | $27.00 | $31.10 | ||||||||||||||||||
Pension and OPEB costs | 345.4 | 355.3 | 170.2 | 174.2 | 175.2 | 181.1 | ||||||||||||||||||
AROs | 74.6 | 65.7 | 43.1 | 36.7 | 31.5 | 29 | ||||||||||||||||||
Emission allowances | 28 | 30 | 28 | 30 | — | — | ||||||||||||||||||
Environmental-related costs | 26.6 | 25 | 22 | 21 | 4.6 | 4 | ||||||||||||||||||
Derivatives | 23.3 | 21.1 | 17.7 | 5.9 | 5.6 | 15.2 | ||||||||||||||||||
Other | 88.8 | 86.4 | 35.2 | 47.1 | 53.6 | 39.3 | ||||||||||||||||||
$1,524.30 | $1,413.20 | $1,226.80 | $1,113.50 | $297.50 | $299.70 | |||||||||||||||||||
Regulatory Liabilities | ' | |||||||||||||||||||||||
Regulatory liabilities were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Cost of removal obligations | $422.70 | $418.90 | $280.90 | $277.70 | $141.80 | $141.20 | ||||||||||||||||||
IPL’s tax benefit riders | 266.3 | 265.4 | 266.3 | 265.4 | — | — | ||||||||||||||||||
Energy efficiency cost recovery | 67.5 | 52.7 | 8.6 | 9.3 | 58.9 | 43.4 | ||||||||||||||||||
Derivatives | 41.2 | 7.2 | 8.4 | 3.6 | 32.8 | 3.6 | ||||||||||||||||||
IPL’s electric transmission cost recovery | 14.1 | 14.6 | 14.1 | 14.6 | — | — | ||||||||||||||||||
IPL’s electric transmission assets sale | 13.7 | 21.6 | 13.7 | 21.6 | — | — | ||||||||||||||||||
Other | 51.3 | 41.1 | 31.2 | 22.7 | 20.1 | 18.4 | ||||||||||||||||||
$876.80 | $821.50 | $623.20 | $614.90 | $253.60 | $206.60 | |||||||||||||||||||
Tax Benefit Riders | ' | |||||||||||||||||||||||
For the nine months ended September 30, 2014, Alliant Energy and IPL utilized “IPL’s tax benefit riders” regulatory liabilities to credit IPL’s Iowa retail electric and gas customers’ bills as follows (in millions): | ||||||||||||||||||||||||
Electric tax benefit rider | $64 | |||||||||||||||||||||||
Gas tax benefit rider | 9 | |||||||||||||||||||||||
$73 | ||||||||||||||||||||||||
Revenue Requirement Adjustment | ' | |||||||||||||||||||||||
For the three and nine months ended September 30, the revenue requirement adjustment recognized by both Alliant Energy and IPL is included in the table below (in millions). The revenue requirement adjustment resulted in increases to electric revenues in their income statements and was recognized through the energy adjustment clause as a reduction of the credits on IPL’s Iowa retail electric customers’ bills from the electric tax benefit rider. | ||||||||||||||||||||||||
Three Months | Nine Months | |||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||
Revenue requirement adjustment | $4 | $7 | $11 | $18 | ||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||
Regulatory Assets [Line Items] | ' | |||||||||||||||||||||||
Regulatory Assets | ' | |||||||||||||||||||||||
Regulatory assets were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Tax-related | $937.60 | $829.70 | $910.60 | $798.60 | $27.00 | $31.10 | ||||||||||||||||||
Pension and OPEB costs | 345.4 | 355.3 | 170.2 | 174.2 | 175.2 | 181.1 | ||||||||||||||||||
AROs | 74.6 | 65.7 | 43.1 | 36.7 | 31.5 | 29 | ||||||||||||||||||
Emission allowances | 28 | 30 | 28 | 30 | — | — | ||||||||||||||||||
Environmental-related costs | 26.6 | 25 | 22 | 21 | 4.6 | 4 | ||||||||||||||||||
Derivatives | 23.3 | 21.1 | 17.7 | 5.9 | 5.6 | 15.2 | ||||||||||||||||||
Other | 88.8 | 86.4 | 35.2 | 47.1 | 53.6 | 39.3 | ||||||||||||||||||
$1,524.30 | $1,413.20 | $1,226.80 | $1,113.50 | $297.50 | $299.70 | |||||||||||||||||||
Regulatory Liabilities | ' | |||||||||||||||||||||||
Regulatory liabilities were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Cost of removal obligations | $422.70 | $418.90 | $280.90 | $277.70 | $141.80 | $141.20 | ||||||||||||||||||
IPL’s tax benefit riders | 266.3 | 265.4 | 266.3 | 265.4 | — | — | ||||||||||||||||||
Energy efficiency cost recovery | 67.5 | 52.7 | 8.6 | 9.3 | 58.9 | 43.4 | ||||||||||||||||||
Derivatives | 41.2 | 7.2 | 8.4 | 3.6 | 32.8 | 3.6 | ||||||||||||||||||
IPL’s electric transmission cost recovery | 14.1 | 14.6 | 14.1 | 14.6 | — | — | ||||||||||||||||||
IPL’s electric transmission assets sale | 13.7 | 21.6 | 13.7 | 21.6 | — | — | ||||||||||||||||||
Other | 51.3 | 41.1 | 31.2 | 22.7 | 20.1 | 18.4 | ||||||||||||||||||
$876.80 | $821.50 | $623.20 | $614.90 | $253.60 | $206.60 | |||||||||||||||||||
Tax Benefit Riders | ' | |||||||||||||||||||||||
For the nine months ended September 30, 2014, Alliant Energy and IPL utilized “IPL’s tax benefit riders” regulatory liabilities to credit IPL’s Iowa retail electric and gas customers’ bills as follows (in millions): | ||||||||||||||||||||||||
Electric tax benefit rider | $64 | |||||||||||||||||||||||
Gas tax benefit rider | 9 | |||||||||||||||||||||||
$73 | ||||||||||||||||||||||||
Revenue Requirement Adjustment | ' | |||||||||||||||||||||||
For the three and nine months ended September 30, the revenue requirement adjustment recognized by both Alliant Energy and IPL is included in the table below (in millions). The revenue requirement adjustment resulted in increases to electric revenues in their income statements and was recognized through the energy adjustment clause as a reduction of the credits on IPL’s Iowa retail electric customers’ bills from the electric tax benefit rider. | ||||||||||||||||||||||||
Three Months | Nine Months | |||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||
Revenue requirement adjustment | $4 | $7 | $11 | $18 | ||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||
Regulatory Assets [Line Items] | ' | |||||||||||||||||||||||
Regulatory Assets | ' | |||||||||||||||||||||||
Regulatory assets were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Tax-related | $937.60 | $829.70 | $910.60 | $798.60 | $27.00 | $31.10 | ||||||||||||||||||
Pension and OPEB costs | 345.4 | 355.3 | 170.2 | 174.2 | 175.2 | 181.1 | ||||||||||||||||||
AROs | 74.6 | 65.7 | 43.1 | 36.7 | 31.5 | 29 | ||||||||||||||||||
Emission allowances | 28 | 30 | 28 | 30 | — | — | ||||||||||||||||||
Environmental-related costs | 26.6 | 25 | 22 | 21 | 4.6 | 4 | ||||||||||||||||||
Derivatives | 23.3 | 21.1 | 17.7 | 5.9 | 5.6 | 15.2 | ||||||||||||||||||
Other | 88.8 | 86.4 | 35.2 | 47.1 | 53.6 | 39.3 | ||||||||||||||||||
$1,524.30 | $1,413.20 | $1,226.80 | $1,113.50 | $297.50 | $299.70 | |||||||||||||||||||
Regulatory Liabilities | ' | |||||||||||||||||||||||
Regulatory liabilities were comprised of the following items (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | |||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Cost of removal obligations | $422.70 | $418.90 | $280.90 | $277.70 | $141.80 | $141.20 | ||||||||||||||||||
IPL’s tax benefit riders | 266.3 | 265.4 | 266.3 | 265.4 | — | — | ||||||||||||||||||
Energy efficiency cost recovery | 67.5 | 52.7 | 8.6 | 9.3 | 58.9 | 43.4 | ||||||||||||||||||
Derivatives | 41.2 | 7.2 | 8.4 | 3.6 | 32.8 | 3.6 | ||||||||||||||||||
IPL’s electric transmission cost recovery | 14.1 | 14.6 | 14.1 | 14.6 | — | — | ||||||||||||||||||
IPL’s electric transmission assets sale | 13.7 | 21.6 | 13.7 | 21.6 | — | — | ||||||||||||||||||
Other | 51.3 | 41.1 | 31.2 | 22.7 | 20.1 | 18.4 | ||||||||||||||||||
$876.80 | $821.50 | $623.20 | $614.90 | $253.60 | $206.60 | |||||||||||||||||||
Receivables_Tables
Receivables (Tables) | 9 Months Ended | |||||||||||||||
Sep. 30, 2014 | ||||||||||||||||
Receivables [Line Items] | ' | |||||||||||||||
Maximum And Average Outstanding Cash Proceeds | ' | |||||||||||||||
Maximum and average outstanding cash proceeds, and costs incurred related to the sales of accounts receivable program for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||
Three Months | Nine Months | |||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances) | $92.00 | $155.00 | $92.00 | $170.00 | ||||||||||||
Average outstanding aggregate cash proceeds (based on daily outstanding balances) | 54.5 | 132.7 | 38.9 | 132.5 | ||||||||||||
Costs incurred | 0.2 | 0.3 | 0.6 | 1 | ||||||||||||
Receivables Sold Under The Receivables Agreement | ' | |||||||||||||||
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions): | ||||||||||||||||
September 30, 2014 | December 31, 2013 | |||||||||||||||
Customer accounts receivable | $142.60 | $151.60 | ||||||||||||||
Unbilled utility revenues | 60.7 | 86.2 | ||||||||||||||
Other receivables | 0.4 | 0.2 | ||||||||||||||
Receivables sold | 203.7 | 238 | ||||||||||||||
Less: cash proceeds (a) | 38 | 29 | ||||||||||||||
Deferred proceeds | 165.7 | 209 | ||||||||||||||
Less: allowance for doubtful accounts | 5.4 | 5.5 | ||||||||||||||
Fair value of deferred proceeds | $160.30 | $203.50 | ||||||||||||||
Outstanding receivables past due | $17.80 | $21.50 | ||||||||||||||
(a) | Changes in cash proceeds are presented in “Accounts receivable” in operating activities in Alliant Energy’s and IPL’s cash flows statements. | |||||||||||||||
Additional Attributes Of Receivables Sold Under The Receivables Agreement | ' | |||||||||||||||
Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||
Three Months | Nine Months | |||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||
Collections reinvested in receivables | $520.10 | $481.10 | $1,537.30 | $1,407.40 | ||||||||||||
Credit losses, net of recoveries | 6.4 | 3.9 | 12.8 | 7.8 | ||||||||||||
IPL [Member] | ' | |||||||||||||||
Receivables [Line Items] | ' | |||||||||||||||
Maximum And Average Outstanding Cash Proceeds | ' | |||||||||||||||
Maximum and average outstanding cash proceeds, and costs incurred related to the sales of accounts receivable program for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||
Three Months | Nine Months | |||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances) | $92.00 | $155.00 | $92.00 | $170.00 | ||||||||||||
Average outstanding aggregate cash proceeds (based on daily outstanding balances) | 54.5 | 132.7 | 38.9 | 132.5 | ||||||||||||
Costs incurred | 0.2 | 0.3 | 0.6 | 1 | ||||||||||||
Receivables Sold Under The Receivables Agreement | ' | |||||||||||||||
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions): | ||||||||||||||||
September 30, 2014 | December 31, 2013 | |||||||||||||||
Customer accounts receivable | $142.60 | $151.60 | ||||||||||||||
Unbilled utility revenues | 60.7 | 86.2 | ||||||||||||||
Other receivables | 0.4 | 0.2 | ||||||||||||||
Receivables sold | 203.7 | 238 | ||||||||||||||
Less: cash proceeds (a) | 38 | 29 | ||||||||||||||
Deferred proceeds | 165.7 | 209 | ||||||||||||||
Less: allowance for doubtful accounts | 5.4 | 5.5 | ||||||||||||||
Fair value of deferred proceeds | $160.30 | $203.50 | ||||||||||||||
Outstanding receivables past due | $17.80 | $21.50 | ||||||||||||||
(a) | Changes in cash proceeds are presented in “Accounts receivable” in operating activities in Alliant Energy’s and IPL’s cash flows statements. | |||||||||||||||
Additional Attributes Of Receivables Sold Under The Receivables Agreement | ' | |||||||||||||||
Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||
Three Months | Nine Months | |||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||
Collections reinvested in receivables | $520.10 | $481.10 | $1,537.30 | $1,407.40 | ||||||||||||
Credit losses, net of recoveries | 6.4 | 3.9 | 12.8 | 7.8 | ||||||||||||
Investments_Tables
Investments (Tables) | 9 Months Ended | |||||||||||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||||||||||
Schedule of Investments [Line Items] | ' | |||||||||||||||||||||||||||||||
Unconsolidated Equity Investments | ' | |||||||||||||||||||||||||||||||
Equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | WPL | |||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||
ATC | ($11.2 | ) | ($10.8 | ) | ($33.5 | ) | ($31.7 | ) | ($11.2 | ) | ($10.8 | ) | ($33.5 | ) | ($31.7 | ) | ||||||||||||||||
Other | (0.3 | ) | (0.3 | ) | (0.7 | ) | (1.0 | ) | (0.2 | ) | (0.3 | ) | (0.7 | ) | (1.0 | ) | ||||||||||||||||
($11.5 | ) | ($11.1 | ) | ($34.2 | ) | ($32.7 | ) | ($11.4 | ) | ($11.1 | ) | ($34.2 | ) | ($32.7 | ) | |||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||||||||||
Schedule of Investments [Line Items] | ' | |||||||||||||||||||||||||||||||
Unconsolidated Equity Investments | ' | |||||||||||||||||||||||||||||||
Equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | WPL | |||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||
ATC | ($11.2 | ) | ($10.8 | ) | ($33.5 | ) | ($31.7 | ) | ($11.2 | ) | ($10.8 | ) | ($33.5 | ) | ($31.7 | ) | ||||||||||||||||
Other | (0.3 | ) | (0.3 | ) | (0.7 | ) | (1.0 | ) | (0.2 | ) | (0.3 | ) | (0.7 | ) | (1.0 | ) | ||||||||||||||||
($11.5 | ) | ($11.1 | ) | ($34.2 | ) | ($32.7 | ) | ($11.4 | ) | ($11.1 | ) | ($34.2 | ) | ($32.7 | ) | |||||||||||||||||
Common_Equity_Tables
Common Equity (Tables) | 9 Months Ended | ||
Sep. 30, 2014 | |||
Stockholders' Equity Note [Abstract] | ' | ||
Common Share Activity | ' | ||
A summary of Alliant Energy’s common stock activity was as follows: | |||
Shares outstanding, January 1, 2014 | 110,943,669 | ||
Equity-based compensation plans (Note 10(b)) | 35,547 | ||
Other | (43,536 | ) | |
Shares outstanding, September 30, 2014 | 110,935,680 | ||
Debt_Tables
Debt (Tables) | 9 Months Ended | |||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||
Debt Disclosure [Line Items] | ' | |||||||||||||||||||||||
Other Short-Term Borrowings | ' | |||||||||||||||||||||||
Information regarding commercial paper classified as short-term debt and back-stopped by the credit facilities was as follows (dollars in millions): | ||||||||||||||||||||||||
Alliant Energy | Parent | |||||||||||||||||||||||
September 30, 2014 | (Consolidated) | Company | IPL | WPL | ||||||||||||||||||||
Commercial paper: | ||||||||||||||||||||||||
Amount outstanding | $353.80 | $169.10 | $38.00 | $146.70 | ||||||||||||||||||||
Weighted average remaining maturity | 3 days | 3 days | 1 day | 3 days | ||||||||||||||||||||
Weighted average interest rates | 0.20% | 0.30% | 0.30% | 0.10% | ||||||||||||||||||||
Available credit facility capacity | $646.20 | $130.90 | $262.00 | $253.30 | ||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $— | $185.00 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $307.10 | $228.80 | $0.40 | $— | $157.90 | $140.90 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.3 | % | N/A | 0.1 | % | 0.2 | % | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $26.30 | $204.70 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $281.90 | $197.20 | $0.30 | $1.70 | $157.50 | $113.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.2 | % | 0.4 | % | 0.1 | % | 0.2 | % | ||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||
Debt Disclosure [Line Items] | ' | |||||||||||||||||||||||
Other Short-Term Borrowings | ' | |||||||||||||||||||||||
Information regarding commercial paper classified as short-term debt and back-stopped by the credit facilities was as follows (dollars in millions): | ||||||||||||||||||||||||
Alliant Energy | Parent | |||||||||||||||||||||||
September 30, 2014 | (Consolidated) | Company | IPL | WPL | ||||||||||||||||||||
Commercial paper: | ||||||||||||||||||||||||
Amount outstanding | $353.80 | $169.10 | $38.00 | $146.70 | ||||||||||||||||||||
Weighted average remaining maturity | 3 days | 3 days | 1 day | 3 days | ||||||||||||||||||||
Weighted average interest rates | 0.20% | 0.30% | 0.30% | 0.10% | ||||||||||||||||||||
Available credit facility capacity | $646.20 | $130.90 | $262.00 | $253.30 | ||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $— | $185.00 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $307.10 | $228.80 | $0.40 | $— | $157.90 | $140.90 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.3 | % | N/A | 0.1 | % | 0.2 | % | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $26.30 | $204.70 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $281.90 | $197.20 | $0.30 | $1.70 | $157.50 | $113.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.2 | % | 0.4 | % | 0.1 | % | 0.2 | % | ||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||
Debt Disclosure [Line Items] | ' | |||||||||||||||||||||||
Other Short-Term Borrowings | ' | |||||||||||||||||||||||
Information regarding commercial paper classified as short-term debt and back-stopped by the credit facilities was as follows (dollars in millions): | ||||||||||||||||||||||||
Alliant Energy | Parent | |||||||||||||||||||||||
September 30, 2014 | (Consolidated) | Company | IPL | WPL | ||||||||||||||||||||
Commercial paper: | ||||||||||||||||||||||||
Amount outstanding | $353.80 | $169.10 | $38.00 | $146.70 | ||||||||||||||||||||
Weighted average remaining maturity | 3 days | 3 days | 1 day | 3 days | ||||||||||||||||||||
Weighted average interest rates | 0.20% | 0.30% | 0.30% | 0.10% | ||||||||||||||||||||
Available credit facility capacity | $646.20 | $130.90 | $262.00 | $253.30 | ||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $— | $185.00 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $307.10 | $228.80 | $0.40 | $— | $157.90 | $140.90 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.3 | % | N/A | 0.1 | % | 0.2 | % | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Maximum amount outstanding | $353.80 | $284.10 | $38.00 | $26.30 | $204.70 | $165.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Average amount outstanding | $281.90 | $197.20 | $0.30 | $1.70 | $157.50 | $113.40 | ||||||||||||||||||
(based on daily outstanding balances) | ||||||||||||||||||||||||
Weighted average interest rates | 0.2 | % | 0.2 | % | 0.2 | % | 0.4 | % | 0.1 | % | 0.2 | % |
Income_Taxes_Tables
Income Taxes (Tables) | 9 Months Ended | ||||||||||||||||||||
Sep. 30, 2014 | |||||||||||||||||||||
Income Taxes [Line Items] | ' | ||||||||||||||||||||
Schedule Of Effective Income Tax Rates | ' | ||||||||||||||||||||
The overall income tax rates shown in the following table were computed by dividing income tax expense (benefit) by income from continuing operations before income taxes. | |||||||||||||||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (13.0 | ) | (12.9 | ) | (39.2 | ) | (38.9 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (8.6 | ) | (6.2 | ) | (22.4 | ) | (16.5 | ) | (0.8 | ) | (1.4 | ) | |||||||||
Production tax credits | (6.8 | ) | (7.7 | ) | (9.3 | ) | (10.6 | ) | (6.2 | ) | (6.6 | ) | |||||||||
Other items, net | 0.7 | 1.6 | 2.2 | 0.4 | — | 3.7 | |||||||||||||||
Overall income tax rate | 7.3 | % | 9.8 | % | (33.7 | %) | (30.6 | %) | 28 | % | 30.7 | % | |||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (12.4 | ) | (12.6 | ) | (36.5 | ) | (37.8 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (6.7 | ) | (5.9 | ) | (18.4 | ) | (16.1 | ) | (0.7 | ) | (0.8 | ) | |||||||||
Production tax credits | (6.6 | ) | (7.7 | ) | (8.8 | ) | (10.4 | ) | (6.2 | ) | (6.9 | ) | |||||||||
Other items, net | 2.9 | 2.6 | 3.2 | 0.8 | 3 | 4.4 | |||||||||||||||
Overall income tax rate | 12.2 | % | 11.4 | % | (25.5 | %) | (28.5 | %) | 31.1 | % | 31.7 | % | |||||||||
Production Tax Credits (Net Of State Tax Impacts) | ' | ||||||||||||||||||||
For the three and nine months ended September 30, details regarding production tax credits (net of state tax impacts) related to various wind projects are as follows (dollars in millions): | |||||||||||||||||||||
End of Production | Nameplate | Three Months | Nine Months | ||||||||||||||||||
Tax Credit Generation | Capacity in MW | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||
Cedar Ridge (WPL) | Dec-18 | 68 | $0.60 | $0.60 | $2.80 | $2.90 | |||||||||||||||
Bent Tree - Phase I (WPL) | Feb-21 | 201 | 2 | 2.2 | 9.4 | 9.2 | |||||||||||||||
Subtotal (WPL) | 2.6 | 2.8 | 12.2 | 12.1 | |||||||||||||||||
Whispering Willow - East (IPL) | Dec-19 | 200 | 2 | 2.3 | 9.8 | 10.3 | |||||||||||||||
$4.60 | $5.10 | $22.00 | $22.40 | ||||||||||||||||||
Summary Of Tax Credit Carryforwards | ' | ||||||||||||||||||||
At September 30, 2014, tax carryforwards and associated deferred tax assets and expiration dates were estimated as follows (dollars in millions): | |||||||||||||||||||||
Alliant Energy | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $710 | $244 | 2029 | ||||||||||||||||||
State net operating losses | 744 | 37 | 2018 | ||||||||||||||||||
Federal tax credits | 193 | 190 | 2022 | ||||||||||||||||||
$471 | |||||||||||||||||||||
IPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $310 | $106 | 2029 | ||||||||||||||||||
State net operating losses | 217 | 11 | 2018 | ||||||||||||||||||
Federal tax credits | 64 | 63 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
WPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $305 | $105 | 2029 | ||||||||||||||||||
State net operating losses | 116 | 6 | 2018 | ||||||||||||||||||
Federal tax credits | 71 | 69 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
IPL [Member] | ' | ||||||||||||||||||||
Income Taxes [Line Items] | ' | ||||||||||||||||||||
Schedule Of Effective Income Tax Rates | ' | ||||||||||||||||||||
The overall income tax rates shown in the following table were computed by dividing income tax expense (benefit) by income from continuing operations before income taxes. | |||||||||||||||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (13.0 | ) | (12.9 | ) | (39.2 | ) | (38.9 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (8.6 | ) | (6.2 | ) | (22.4 | ) | (16.5 | ) | (0.8 | ) | (1.4 | ) | |||||||||
Production tax credits | (6.8 | ) | (7.7 | ) | (9.3 | ) | (10.6 | ) | (6.2 | ) | (6.6 | ) | |||||||||
Other items, net | 0.7 | 1.6 | 2.2 | 0.4 | — | 3.7 | |||||||||||||||
Overall income tax rate | 7.3 | % | 9.8 | % | (33.7 | %) | (30.6 | %) | 28 | % | 30.7 | % | |||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (12.4 | ) | (12.6 | ) | (36.5 | ) | (37.8 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (6.7 | ) | (5.9 | ) | (18.4 | ) | (16.1 | ) | (0.7 | ) | (0.8 | ) | |||||||||
Production tax credits | (6.6 | ) | (7.7 | ) | (8.8 | ) | (10.4 | ) | (6.2 | ) | (6.9 | ) | |||||||||
Other items, net | 2.9 | 2.6 | 3.2 | 0.8 | 3 | 4.4 | |||||||||||||||
Overall income tax rate | 12.2 | % | 11.4 | % | (25.5 | %) | (28.5 | %) | 31.1 | % | 31.7 | % | |||||||||
Production Tax Credits (Net Of State Tax Impacts) | ' | ||||||||||||||||||||
For the three and nine months ended September 30, details regarding production tax credits (net of state tax impacts) related to various wind projects are as follows (dollars in millions): | |||||||||||||||||||||
End of Production | Nameplate | Three Months | Nine Months | ||||||||||||||||||
Tax Credit Generation | Capacity in MW | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||
Cedar Ridge (WPL) | Dec-18 | 68 | $0.60 | $0.60 | $2.80 | $2.90 | |||||||||||||||
Bent Tree - Phase I (WPL) | Feb-21 | 201 | 2 | 2.2 | 9.4 | 9.2 | |||||||||||||||
Subtotal (WPL) | 2.6 | 2.8 | 12.2 | 12.1 | |||||||||||||||||
Whispering Willow - East (IPL) | Dec-19 | 200 | 2 | 2.3 | 9.8 | 10.3 | |||||||||||||||
$4.60 | $5.10 | $22.00 | $22.40 | ||||||||||||||||||
Summary Of Tax Credit Carryforwards | ' | ||||||||||||||||||||
At September 30, 2014, tax carryforwards and associated deferred tax assets and expiration dates were estimated as follows (dollars in millions): | |||||||||||||||||||||
Alliant Energy | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $710 | $244 | 2029 | ||||||||||||||||||
State net operating losses | 744 | 37 | 2018 | ||||||||||||||||||
Federal tax credits | 193 | 190 | 2022 | ||||||||||||||||||
$471 | |||||||||||||||||||||
IPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $310 | $106 | 2029 | ||||||||||||||||||
State net operating losses | 217 | 11 | 2018 | ||||||||||||||||||
Federal tax credits | 64 | 63 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
WPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $305 | $105 | 2029 | ||||||||||||||||||
State net operating losses | 116 | 6 | 2018 | ||||||||||||||||||
Federal tax credits | 71 | 69 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
WPL [Member] | ' | ||||||||||||||||||||
Income Taxes [Line Items] | ' | ||||||||||||||||||||
Schedule Of Effective Income Tax Rates | ' | ||||||||||||||||||||
The overall income tax rates shown in the following table were computed by dividing income tax expense (benefit) by income from continuing operations before income taxes. | |||||||||||||||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (13.0 | ) | (12.9 | ) | (39.2 | ) | (38.9 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (8.6 | ) | (6.2 | ) | (22.4 | ) | (16.5 | ) | (0.8 | ) | (1.4 | ) | |||||||||
Production tax credits | (6.8 | ) | (7.7 | ) | (9.3 | ) | (10.6 | ) | (6.2 | ) | (6.6 | ) | |||||||||
Other items, net | 0.7 | 1.6 | 2.2 | 0.4 | — | 3.7 | |||||||||||||||
Overall income tax rate | 7.3 | % | 9.8 | % | (33.7 | %) | (30.6 | %) | 28 | % | 30.7 | % | |||||||||
Alliant Energy | IPL | WPL | |||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||
Statutory federal income tax rate | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | 35 | % | |||||||||
IPL’s tax benefit riders | (12.4 | ) | (12.6 | ) | (36.5 | ) | (37.8 | ) | — | — | |||||||||||
Effect of rate-making on property-related differences | (6.7 | ) | (5.9 | ) | (18.4 | ) | (16.1 | ) | (0.7 | ) | (0.8 | ) | |||||||||
Production tax credits | (6.6 | ) | (7.7 | ) | (8.8 | ) | (10.4 | ) | (6.2 | ) | (6.9 | ) | |||||||||
Other items, net | 2.9 | 2.6 | 3.2 | 0.8 | 3 | 4.4 | |||||||||||||||
Overall income tax rate | 12.2 | % | 11.4 | % | (25.5 | %) | (28.5 | %) | 31.1 | % | 31.7 | % | |||||||||
Production Tax Credits (Net Of State Tax Impacts) | ' | ||||||||||||||||||||
For the three and nine months ended September 30, details regarding production tax credits (net of state tax impacts) related to various wind projects are as follows (dollars in millions): | |||||||||||||||||||||
End of Production | Nameplate | Three Months | Nine Months | ||||||||||||||||||
Tax Credit Generation | Capacity in MW | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||
Cedar Ridge (WPL) | Dec-18 | 68 | $0.60 | $0.60 | $2.80 | $2.90 | |||||||||||||||
Bent Tree - Phase I (WPL) | Feb-21 | 201 | 2 | 2.2 | 9.4 | 9.2 | |||||||||||||||
Subtotal (WPL) | 2.6 | 2.8 | 12.2 | 12.1 | |||||||||||||||||
Whispering Willow - East (IPL) | Dec-19 | 200 | 2 | 2.3 | 9.8 | 10.3 | |||||||||||||||
$4.60 | $5.10 | $22.00 | $22.40 | ||||||||||||||||||
Summary Of Tax Credit Carryforwards | ' | ||||||||||||||||||||
At September 30, 2014, tax carryforwards and associated deferred tax assets and expiration dates were estimated as follows (dollars in millions): | |||||||||||||||||||||
Alliant Energy | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $710 | $244 | 2029 | ||||||||||||||||||
State net operating losses | 744 | 37 | 2018 | ||||||||||||||||||
Federal tax credits | 193 | 190 | 2022 | ||||||||||||||||||
$471 | |||||||||||||||||||||
IPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $310 | $106 | 2029 | ||||||||||||||||||
State net operating losses | 217 | 11 | 2018 | ||||||||||||||||||
Federal tax credits | 64 | 63 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
WPL | Carryforward | Deferred | Earliest | ||||||||||||||||||
Amount | Tax Assets | Expiration Date | |||||||||||||||||||
Federal net operating losses | $305 | $105 | 2029 | ||||||||||||||||||
State net operating losses | 116 | 6 | 2018 | ||||||||||||||||||
Federal tax credits | 71 | 69 | 2022 | ||||||||||||||||||
$180 | |||||||||||||||||||||
Benefit_Plans_Tables
Benefit Plans (Tables) | 9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Plan Disclosure [Line Items] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Pension And Other Postretirement Benefits Plans | ' | |||||||||||||||||||||||||||||||||||||||||||||||
The components of net periodic benefit costs (credits) for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included in the tables below (in millions). In the “IPL” and “WPL” tables below, the defined benefit pension plans costs represent those respective costs for IPL’s and WPL’s bargaining unit employees covered under the qualified plans that are sponsored by IPL and WPL, respectively, as well as amounts directly assigned to each of IPL and WPL related to IPL’s and WPL’s current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In the “IPL” and “WPL” tables below, the OPEB plans costs (credits) represent costs (credits) for IPL and WPL employees, respectively. | ||||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $3.30 | $3.90 | $9.90 | $11.80 | $1.30 | $1.50 | $3.90 | $4.70 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 13.6 | 12.3 | 40.6 | 36.8 | 2.4 | 2.1 | 7.1 | 6.3 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (18.8 | ) | (18.5 | ) | (56.3 | ) | (55.5 | ) | (2.1 | ) | (2.0 | ) | (6.2 | ) | (6.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | — | 0.2 | (3.0 | ) | (3.0 | ) | (8.9 | ) | (8.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 4.8 | 9 | 14.6 | 27.1 | 0.6 | 1.3 | 1.8 | 3.7 | ||||||||||||||||||||||||||||||||||||||||
$2.90 | $6.80 | $8.80 | $20.40 | ($0.8 | ) | ($0.1 | ) | ($2.3 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
IPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.80 | $2.20 | $5.40 | $6.50 | $0.60 | $0.80 | $1.80 | $2.20 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 6.2 | 5.7 | 18.8 | 17.1 | 1 | 0.9 | 3 | 2.7 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.9 | ) | (8.8 | ) | (26.8 | ) | (26.4 | ) | (1.5 | ) | (1.4 | ) | (4.4 | ) | (4.2 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | — | — | 0.1 | (1.6 | ) | (1.6 | ) | (4.7 | ) | (4.7 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2 | 3.8 | 6 | 11.4 | 0.3 | 0.6 | 0.8 | 2 | ||||||||||||||||||||||||||||||||||||||||
$1.10 | $2.90 | $3.40 | $8.70 | ($1.2 | ) | ($0.7 | ) | ($3.5 | ) | ($2.0 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
WPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.30 | $1.50 | $3.70 | $4.40 | $0.50 | $0.60 | $1.50 | $1.80 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 5.7 | 5.2 | 17 | 15.5 | 1 | 0.8 | 2.9 | 2.5 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.1 | ) | (8.0 | ) | (24.3 | ) | (23.9 | ) | (0.4 | ) | (0.4 | ) | (1.0 | ) | (1.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | 0.2 | 0.3 | (1.0 | ) | (0.9 | ) | (2.9 | ) | (2.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2.3 | 4.2 | 6.9 | 12.8 | 0.3 | 0.5 | 0.9 | 1.5 | ||||||||||||||||||||||||||||||||||||||||
$1.20 | $3.00 | $3.50 | $9.10 | $0.40 | $0.60 | $1.40 | $1.90 | |||||||||||||||||||||||||||||||||||||||||
Schedule Of Qualified And Non-Qualified Pension And Other Postretirement Benefits Costs | ' | |||||||||||||||||||||||||||||||||||||||||||||||
The following table includes the allocated qualified and non-qualified pension and OPEB costs (credits) associated with Corporate Services employees providing services to IPL and WPL for the three and nine months ended September 30 (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Pension Benefits Costs | OPEB Credits | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||
IPL | $0.40 | $0.40 | $1.10 | $1.40 | $— | ($0.1 | ) | ($0.2 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
WPL | 0.3 | 0.4 | 0.8 | 1.1 | (0.1 | ) | (0.1 | ) | (0.2 | ) | (0.2 | ) | ||||||||||||||||||||||||||||||||||||
Employees Participate In Defined Contribution Retirement Plans | ' | |||||||||||||||||||||||||||||||||||||||||||||||
For the three and nine months ended September 30, costs related to the 401(k) savings plans, which are partially based on the participants’ contributions, were as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL (a) | WPL (a) | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
401(k) costs | $5.30 | $4.70 | $17.30 | $14.70 | $2.70 | $2.40 | $8.40 | $7.60 | $2.40 | $2.10 | $8.30 | $6.50 | ||||||||||||||||||||||||||||||||||||
(a) | IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees. | |||||||||||||||||||||||||||||||||||||||||||||||
Recognized Compensation Expense And Income Tax Benefits | ' | |||||||||||||||||||||||||||||||||||||||||||||||
A summary of compensation expense (including amounts allocated to IPL and WPL) and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
Compensation expense | $1.20 | $4.00 | $7.40 | $8.60 | $0.60 | $2.00 | $4.00 | $4.40 | $0.50 | $1.70 | $3.10 | $3.70 | ||||||||||||||||||||||||||||||||||||
Income tax benefits | 0.5 | 1.6 | 3 | 3.5 | 0.2 | 0.8 | 1.6 | 1.8 | 0.3 | 0.7 | 1.3 | 1.5 | ||||||||||||||||||||||||||||||||||||
Schedule Of Equity-based Compensation Plans Activity | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Information related to fair values of nonvested performance shares and units at September 30, 2014, by year of grant, was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
Performance Shares | Performance Units | |||||||||||||||||||||||||||||||||||||||||||||||
2014 Grant | 2013 Grant | 2012 Grant | 2014 Grant | 2013 Grant | 2012 Grant | |||||||||||||||||||||||||||||||||||||||||||
Nonvested awards | 49,719 | 49,093 | 45,612 | 19,775 | 21,726 | 23,124 | ||||||||||||||||||||||||||||||||||||||||||
Alliant Energy common stock closing price on September 30, 2014 | $55.41 | $55.41 | $55.41 | |||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy common stock closing price on grant date | $53.77 | $47.58 | $43.05 | |||||||||||||||||||||||||||||||||||||||||||||
Estimated payout percentage based on performance criteria | 94 | % | 117 | % | 126 | % | 94 | % | 117 | % | 126 | % | ||||||||||||||||||||||||||||||||||||
Fair values of each nonvested award | $52.09 | $64.83 | $69.82 | $50.54 | $55.67 | $54.24 | ||||||||||||||||||||||||||||||||||||||||||
Performance Shares [Member] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Plan Disclosure [Line Items] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Schedule Of Equity-based Compensation Plans Activity | ' | |||||||||||||||||||||||||||||||||||||||||||||||
A summary of the performance shares activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, January 1 | 139,940 | 145,277 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 51,221 | 49,093 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested | (45,235 | ) | (54,430 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (1,502 | ) | — | |||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, September 30 | 144,424 | 139,940 | ||||||||||||||||||||||||||||||||||||||||||||||
During the nine months ended September 30, certain performance shares vested, resulting in payouts (a combination of cash and common stock) as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
2011 Grant | 2010 Grant | |||||||||||||||||||||||||||||||||||||||||||||||
Performance shares vested | 45,235 | 54,430 | ||||||||||||||||||||||||||||||||||||||||||||||
Percentage of target number of performance shares | 147.5 | % | 197.5 | % | ||||||||||||||||||||||||||||||||||||||||||||
Aggregate payout value (in millions) | $3.40 | $4.80 | ||||||||||||||||||||||||||||||||||||||||||||||
Payout - cash (in millions) | $2.90 | $4.40 | ||||||||||||||||||||||||||||||||||||||||||||||
Payout - common stock shares issued | 4,810 | 4,177 | ||||||||||||||||||||||||||||||||||||||||||||||
Performance Units [Member] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Plan Disclosure [Line Items] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Schedule Of Equity-based Compensation Plans Activity | ' | |||||||||||||||||||||||||||||||||||||||||||||||
A summary of the performance units activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested units, January 1 | 65,912 | 64,969 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 20,422 | 22,201 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested | (20,751 | ) | (19,760 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (958 | ) | (1,498 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Nonvested units, September 30 | 64,625 | 65,912 | ||||||||||||||||||||||||||||||||||||||||||||||
During the nine months ended September 30, certain performance units vested, resulting in cash payouts as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
2011 Grant | 2010 Grant | |||||||||||||||||||||||||||||||||||||||||||||||
Performance units vested | 20,751 | 19,760 | ||||||||||||||||||||||||||||||||||||||||||||||
Percentage of target number of performance units | 147.5 | % | 197.5 | % | ||||||||||||||||||||||||||||||||||||||||||||
Payout value (in millions) | $1.20 | $1.30 | ||||||||||||||||||||||||||||||||||||||||||||||
Performance Contingent Restricted Stock [Member] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Plan Disclosure [Line Items] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Schedule Of Equity-based Compensation Plans Activity | ' | |||||||||||||||||||||||||||||||||||||||||||||||
A summary of the performance contingent restricted stock activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Shares | Weighted | Shares | Weighted | |||||||||||||||||||||||||||||||||||||||||||||
Average | Average | |||||||||||||||||||||||||||||||||||||||||||||||
Fair Value | Fair Value | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, January 1 | 158,922 | $42.71 | 211,651 | $32.42 | ||||||||||||||||||||||||||||||||||||||||||||
Granted | 51,221 | 53.77 | 49,093 | 47.58 | ||||||||||||||||||||||||||||||||||||||||||||
Vested (a) | (90,847 | ) | 40.91 | — | — | |||||||||||||||||||||||||||||||||||||||||||
Forfeited (b) | (20,484 | ) | 39.85 | (101,822 | ) | 23.67 | ||||||||||||||||||||||||||||||||||||||||||
Nonvested shares, September 30 | 98,812 | 50.69 | 158,922 | 42.71 | ||||||||||||||||||||||||||||||||||||||||||||
(a) | In 2014, 45,612 and 45,235 performance contingent restricted shares granted in 2012 and 2011, respectively, vested because the specified performance criteria for such shares were met. | |||||||||||||||||||||||||||||||||||||||||||||||
(b) | In 2013, 101,822 performance contingent restricted shares granted in 2009 were forfeited because the specified performance criteria for such shares were not met. | |||||||||||||||||||||||||||||||||||||||||||||||
Performance Contingent Cash Awards [Member] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Plan Disclosure [Line Items] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Schedule Of Equity-based Compensation Plans Activity | ' | |||||||||||||||||||||||||||||||||||||||||||||||
A summary of the performance contingent cash awards activity was as follows: | ||||||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Nonvested awards, January 1 | 96,977 | 59,639 | ||||||||||||||||||||||||||||||||||||||||||||||
Granted | 42,446 | 39,530 | ||||||||||||||||||||||||||||||||||||||||||||||
Vested (a) | (55,517 | ) | — | |||||||||||||||||||||||||||||||||||||||||||||
Forfeited | (4,295 | ) | (1,413 | ) | ||||||||||||||||||||||||||||||||||||||||||||
Nonvested awards, September 30 | 79,611 | 97,756 | ||||||||||||||||||||||||||||||||||||||||||||||
(a) | In 2014, 34,766 and 20,751 performance contingent cash awards granted in 2012 and 2011 vested, resulting in cash payouts valued at $1.9 million and $1.1 million, respectively. | |||||||||||||||||||||||||||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Plan Disclosure [Line Items] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Pension And Other Postretirement Benefits Plans | ' | |||||||||||||||||||||||||||||||||||||||||||||||
The components of net periodic benefit costs (credits) for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included in the tables below (in millions). In the “IPL” and “WPL” tables below, the defined benefit pension plans costs represent those respective costs for IPL’s and WPL’s bargaining unit employees covered under the qualified plans that are sponsored by IPL and WPL, respectively, as well as amounts directly assigned to each of IPL and WPL related to IPL’s and WPL’s current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In the “IPL” and “WPL” tables below, the OPEB plans costs (credits) represent costs (credits) for IPL and WPL employees, respectively. | ||||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $3.30 | $3.90 | $9.90 | $11.80 | $1.30 | $1.50 | $3.90 | $4.70 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 13.6 | 12.3 | 40.6 | 36.8 | 2.4 | 2.1 | 7.1 | 6.3 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (18.8 | ) | (18.5 | ) | (56.3 | ) | (55.5 | ) | (2.1 | ) | (2.0 | ) | (6.2 | ) | (6.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | — | 0.2 | (3.0 | ) | (3.0 | ) | (8.9 | ) | (8.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 4.8 | 9 | 14.6 | 27.1 | 0.6 | 1.3 | 1.8 | 3.7 | ||||||||||||||||||||||||||||||||||||||||
$2.90 | $6.80 | $8.80 | $20.40 | ($0.8 | ) | ($0.1 | ) | ($2.3 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
IPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.80 | $2.20 | $5.40 | $6.50 | $0.60 | $0.80 | $1.80 | $2.20 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 6.2 | 5.7 | 18.8 | 17.1 | 1 | 0.9 | 3 | 2.7 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.9 | ) | (8.8 | ) | (26.8 | ) | (26.4 | ) | (1.5 | ) | (1.4 | ) | (4.4 | ) | (4.2 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | — | — | 0.1 | (1.6 | ) | (1.6 | ) | (4.7 | ) | (4.7 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2 | 3.8 | 6 | 11.4 | 0.3 | 0.6 | 0.8 | 2 | ||||||||||||||||||||||||||||||||||||||||
$1.10 | $2.90 | $3.40 | $8.70 | ($1.2 | ) | ($0.7 | ) | ($3.5 | ) | ($2.0 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
WPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.30 | $1.50 | $3.70 | $4.40 | $0.50 | $0.60 | $1.50 | $1.80 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 5.7 | 5.2 | 17 | 15.5 | 1 | 0.8 | 2.9 | 2.5 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.1 | ) | (8.0 | ) | (24.3 | ) | (23.9 | ) | (0.4 | ) | (0.4 | ) | (1.0 | ) | (1.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | 0.2 | 0.3 | (1.0 | ) | (0.9 | ) | (2.9 | ) | (2.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2.3 | 4.2 | 6.9 | 12.8 | 0.3 | 0.5 | 0.9 | 1.5 | ||||||||||||||||||||||||||||||||||||||||
$1.20 | $3.00 | $3.50 | $9.10 | $0.40 | $0.60 | $1.40 | $1.90 | |||||||||||||||||||||||||||||||||||||||||
Schedule Of Qualified And Non-Qualified Pension And Other Postretirement Benefits Costs | ' | |||||||||||||||||||||||||||||||||||||||||||||||
The following table includes the allocated qualified and non-qualified pension and OPEB costs (credits) associated with Corporate Services employees providing services to IPL and WPL for the three and nine months ended September 30 (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Pension Benefits Costs | OPEB Credits | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||
IPL | $0.40 | $0.40 | $1.10 | $1.40 | $— | ($0.1 | ) | ($0.2 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
WPL | 0.3 | 0.4 | 0.8 | 1.1 | (0.1 | ) | (0.1 | ) | (0.2 | ) | (0.2 | ) | ||||||||||||||||||||||||||||||||||||
Employees Participate In Defined Contribution Retirement Plans | ' | |||||||||||||||||||||||||||||||||||||||||||||||
For the three and nine months ended September 30, costs related to the 401(k) savings plans, which are partially based on the participants’ contributions, were as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL (a) | WPL (a) | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
401(k) costs | $5.30 | $4.70 | $17.30 | $14.70 | $2.70 | $2.40 | $8.40 | $7.60 | $2.40 | $2.10 | $8.30 | $6.50 | ||||||||||||||||||||||||||||||||||||
(a) | IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees. | |||||||||||||||||||||||||||||||||||||||||||||||
Recognized Compensation Expense And Income Tax Benefits | ' | |||||||||||||||||||||||||||||||||||||||||||||||
A summary of compensation expense (including amounts allocated to IPL and WPL) and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
Compensation expense | $1.20 | $4.00 | $7.40 | $8.60 | $0.60 | $2.00 | $4.00 | $4.40 | $0.50 | $1.70 | $3.10 | $3.70 | ||||||||||||||||||||||||||||||||||||
Income tax benefits | 0.5 | 1.6 | 3 | 3.5 | 0.2 | 0.8 | 1.6 | 1.8 | 0.3 | 0.7 | 1.3 | 1.5 | ||||||||||||||||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Plan Disclosure [Line Items] | ' | |||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Pension And Other Postretirement Benefits Plans | ' | |||||||||||||||||||||||||||||||||||||||||||||||
The components of net periodic benefit costs (credits) for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included in the tables below (in millions). In the “IPL” and “WPL” tables below, the defined benefit pension plans costs represent those respective costs for IPL’s and WPL’s bargaining unit employees covered under the qualified plans that are sponsored by IPL and WPL, respectively, as well as amounts directly assigned to each of IPL and WPL related to IPL’s and WPL’s current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In the “IPL” and “WPL” tables below, the OPEB plans costs (credits) represent costs (credits) for IPL and WPL employees, respectively. | ||||||||||||||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $3.30 | $3.90 | $9.90 | $11.80 | $1.30 | $1.50 | $3.90 | $4.70 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 13.6 | 12.3 | 40.6 | 36.8 | 2.4 | 2.1 | 7.1 | 6.3 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (18.8 | ) | (18.5 | ) | (56.3 | ) | (55.5 | ) | (2.1 | ) | (2.0 | ) | (6.2 | ) | (6.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | — | 0.2 | (3.0 | ) | (3.0 | ) | (8.9 | ) | (8.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 4.8 | 9 | 14.6 | 27.1 | 0.6 | 1.3 | 1.8 | 3.7 | ||||||||||||||||||||||||||||||||||||||||
$2.90 | $6.80 | $8.80 | $20.40 | ($0.8 | ) | ($0.1 | ) | ($2.3 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
IPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.80 | $2.20 | $5.40 | $6.50 | $0.60 | $0.80 | $1.80 | $2.20 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 6.2 | 5.7 | 18.8 | 17.1 | 1 | 0.9 | 3 | 2.7 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.9 | ) | (8.8 | ) | (26.8 | ) | (26.4 | ) | (1.5 | ) | (1.4 | ) | (4.4 | ) | (4.2 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | — | — | 0.1 | (1.6 | ) | (1.6 | ) | (4.7 | ) | (4.7 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2 | 3.8 | 6 | 11.4 | 0.3 | 0.6 | 0.8 | 2 | ||||||||||||||||||||||||||||||||||||||||
$1.10 | $2.90 | $3.40 | $8.70 | ($1.2 | ) | ($0.7 | ) | ($3.5 | ) | ($2.0 | ) | |||||||||||||||||||||||||||||||||||||
Defined Benefit Pension Plans | OPEB Plans | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
WPL | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||||||||||||||
Service cost | $1.30 | $1.50 | $3.70 | $4.40 | $0.50 | $0.60 | $1.50 | $1.80 | ||||||||||||||||||||||||||||||||||||||||
Interest cost | 5.7 | 5.2 | 17 | 15.5 | 1 | 0.8 | 2.9 | 2.5 | ||||||||||||||||||||||||||||||||||||||||
Expected return on plan assets | (8.1 | ) | (8.0 | ) | (24.3 | ) | (23.9 | ) | (0.4 | ) | (0.4 | ) | (1.0 | ) | (1.0 | ) | ||||||||||||||||||||||||||||||||
Amortization of prior service cost (credit) | — | 0.1 | 0.2 | 0.3 | (1.0 | ) | (0.9 | ) | (2.9 | ) | (2.9 | ) | ||||||||||||||||||||||||||||||||||||
Amortization of actuarial loss | 2.3 | 4.2 | 6.9 | 12.8 | 0.3 | 0.5 | 0.9 | 1.5 | ||||||||||||||||||||||||||||||||||||||||
$1.20 | $3.00 | $3.50 | $9.10 | $0.40 | $0.60 | $1.40 | $1.90 | |||||||||||||||||||||||||||||||||||||||||
Schedule Of Qualified And Non-Qualified Pension And Other Postretirement Benefits Costs | ' | |||||||||||||||||||||||||||||||||||||||||||||||
The following table includes the allocated qualified and non-qualified pension and OPEB costs (credits) associated with Corporate Services employees providing services to IPL and WPL for the three and nine months ended September 30 (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Pension Benefits Costs | OPEB Credits | |||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||||||
IPL | $0.40 | $0.40 | $1.10 | $1.40 | $— | ($0.1 | ) | ($0.2 | ) | ($0.2 | ) | |||||||||||||||||||||||||||||||||||||
WPL | 0.3 | 0.4 | 0.8 | 1.1 | (0.1 | ) | (0.1 | ) | (0.2 | ) | (0.2 | ) | ||||||||||||||||||||||||||||||||||||
Employees Participate In Defined Contribution Retirement Plans | ' | |||||||||||||||||||||||||||||||||||||||||||||||
For the three and nine months ended September 30, costs related to the 401(k) savings plans, which are partially based on the participants’ contributions, were as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL (a) | WPL (a) | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
401(k) costs | $5.30 | $4.70 | $17.30 | $14.70 | $2.70 | $2.40 | $8.40 | $7.60 | $2.40 | $2.10 | $8.30 | $6.50 | ||||||||||||||||||||||||||||||||||||
(a) | IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees. | |||||||||||||||||||||||||||||||||||||||||||||||
Recognized Compensation Expense And Income Tax Benefits | ' | |||||||||||||||||||||||||||||||||||||||||||||||
A summary of compensation expense (including amounts allocated to IPL and WPL) and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||||||||||
Compensation expense | $1.20 | $4.00 | $7.40 | $8.60 | $0.60 | $2.00 | $4.00 | $4.40 | $0.50 | $1.70 | $3.10 | $3.70 | ||||||||||||||||||||||||||||||||||||
Income tax benefits | 0.5 | 1.6 | 3 | 3.5 | 0.2 | 0.8 | 1.6 | 1.8 | 0.3 | 0.7 | 1.3 | 1.5 | ||||||||||||||||||||||||||||||||||||
Asset_Retirement_Obligations_T
Asset Retirement Obligations (Tables) | 9 Months Ended | |||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||
Schedule of Asset Retirement Obligations [Line Items] | ' | |||||||||||||||||||||||
Reconciliation Of Changes In Asset Retirement Obligations | ' | |||||||||||||||||||||||
A reconciliation of the changes in AROs associated with long-lived assets is as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Balance, January 1 | $109.70 | $101.50 | $47.90 | $45.50 | $52.40 | $46.90 | ||||||||||||||||||
Revisions in estimated cash flows | — | 3.4 | — | 0.8 | — | 2.6 | ||||||||||||||||||
Liabilities settled | (1.0 | ) | (0.9 | ) | (0.5 | ) | (0.1 | ) | (0.5 | ) | (0.8 | ) | ||||||||||||
Liabilities incurred (a) | 16.5 | — | 16.3 | — | 0.2 | — | ||||||||||||||||||
Accretion expense | 3.3 | 2.8 | 1.6 | 1.3 | 1.3 | 1.2 | ||||||||||||||||||
Balance, September 30 | $128.50 | $106.80 | $65.30 | $47.50 | $53.40 | $49.90 | ||||||||||||||||||
(a) | In 2014, IPL recorded AROs of $12.0 million related to its Sutherland Generating Station. | |||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||
Schedule of Asset Retirement Obligations [Line Items] | ' | |||||||||||||||||||||||
Reconciliation Of Changes In Asset Retirement Obligations | ' | |||||||||||||||||||||||
A reconciliation of the changes in AROs associated with long-lived assets is as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Balance, January 1 | $109.70 | $101.50 | $47.90 | $45.50 | $52.40 | $46.90 | ||||||||||||||||||
Revisions in estimated cash flows | — | 3.4 | — | 0.8 | — | 2.6 | ||||||||||||||||||
Liabilities settled | (1.0 | ) | (0.9 | ) | (0.5 | ) | (0.1 | ) | (0.5 | ) | (0.8 | ) | ||||||||||||
Liabilities incurred (a) | 16.5 | — | 16.3 | — | 0.2 | — | ||||||||||||||||||
Accretion expense | 3.3 | 2.8 | 1.6 | 1.3 | 1.3 | 1.2 | ||||||||||||||||||
Balance, September 30 | $128.50 | $106.80 | $65.30 | $47.50 | $53.40 | $49.90 | ||||||||||||||||||
(a) | In 2014, IPL recorded AROs of $12.0 million related to its Sutherland Generating Station. | |||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||
Schedule of Asset Retirement Obligations [Line Items] | ' | |||||||||||||||||||||||
Reconciliation Of Changes In Asset Retirement Obligations | ' | |||||||||||||||||||||||
A reconciliation of the changes in AROs associated with long-lived assets is as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Balance, January 1 | $109.70 | $101.50 | $47.90 | $45.50 | $52.40 | $46.90 | ||||||||||||||||||
Revisions in estimated cash flows | — | 3.4 | — | 0.8 | — | 2.6 | ||||||||||||||||||
Liabilities settled | (1.0 | ) | (0.9 | ) | (0.5 | ) | (0.1 | ) | (0.5 | ) | (0.8 | ) | ||||||||||||
Liabilities incurred (a) | 16.5 | — | 16.3 | — | 0.2 | — | ||||||||||||||||||
Accretion expense | 3.3 | 2.8 | 1.6 | 1.3 | 1.3 | 1.2 | ||||||||||||||||||
Balance, September 30 | $128.50 | $106.80 | $65.30 | $47.50 | $53.40 | $49.90 | ||||||||||||||||||
(a) | In 2014, IPL recorded AROs of $12.0 million related to its Sutherland Generating Station. |
Fair_Value_Measurements_Tables
Fair Value Measurements (Tables) | 9 Months Ended | |||||||||||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||||||||||
Statement [Line Items] | ' | |||||||||||||||||||||||||||||||
Carrying Amount and Fair Value Of Financial Instruments | ' | |||||||||||||||||||||||||||||||
Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
September 30, 2014 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $83.10 | $83.10 | $44.70 | $44.70 | $38.40 | $38.40 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 160.3 | 160.3 | 160.3 | 160.3 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,292.30 | 3,852.60 | 1,520.30 | 1,778.20 | 1,324.00 | 1,618.00 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 200.2 | 200 | 200.2 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 14.1 | 14.1 | 8.2 | 8.2 | 5.9 | 5.9 | ||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
December 31, 2013 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $26.70 | $26.70 | $21.10 | $21.10 | $5.60 | $5.60 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 203.5 | 203.5 | 203.5 | 203.5 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,336.30 | 3,712.30 | 1,558.40 | 1,726.40 | 1,332.10 | 1,532.90 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 167 | 200 | 167 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 20.8 | 20.8 | 5.2 | 5.2 | 15.6 | 15.6 | ||||||||||||||||||||||||||
Fair Value Measurements | ' | |||||||||||||||||||||||||||||||
Items subject to fair value measurement disclosure requirements were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $83.10 | $— | $6.30 | $76.80 | $26.70 | $— | $4.70 | $22.00 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 3,852.60 | — | 3,849.30 | 3.3 | 3,712.30 | — | 3,711.80 | 0.5 | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 14.1 | — | 5.6 | 8.5 | 20.8 | — | 3.2 | 17.6 | ||||||||||||||||||||||||
IPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $44.70 | $— | $4.30 | $40.40 | $21.10 | $— | $3.00 | $18.10 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,778.20 | — | 1,778.20 | — | 1,726.40 | — | 1,726.40 | — | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 8.2 | — | 4.3 | 3.9 | 5.2 | — | 1.7 | 3.5 | ||||||||||||||||||||||||
WPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $38.40 | $— | $2.00 | $36.40 | $5.60 | $— | $1.70 | $3.90 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,618.00 | — | 1,618.00 | — | 1,532.90 | — | 1,532.90 | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 5.9 | — | 1.3 | 4.6 | 15.6 | — | 1.5 | 14.1 | ||||||||||||||||||||||||
Fair Value Measurements Using Significant Unobservable Inputs | ' | |||||||||||||||||||||||||||||||
Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $101.20 | $42.50 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (12.7 | ) | 0.1 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.9 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (19.0 | ) | (15.5 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($10.3 | ) | $0.10 | $— | $— | |||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $4.40 | $11.90 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 43 | (8.3 | ) | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (0.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 76.7 | 50.9 | — | — | ||||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (54.6 | ) | (36.4 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | $34.60 | ($8.3 | ) | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $64.20 | $40.60 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (10.1 | ) | 2 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.1 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (16.6 | ) | (13.9 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($9.6 | ) | $2.00 | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $14.60 | $12.50 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (5.1 | ) | 1.5 | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (1.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 68.8 | 46.1 | — | — | ||||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (40.8 | ) | (30.0 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($6.0 | ) | $1.50 | $— | $— | |||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, July 1 | $37.00 | $1.90 | ||||||||||||||||||||||||||||||
Total net losses (realized/unrealized) included in changes in net assets (a) | (2.6 | ) | (1.9 | ) | ||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.8 | ) | |||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (2.4 | ) | (1.6 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30 (a) | ($0.7 | ) | ($1.9 | ) | ||||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, January 1 | ($10.2 | ) | ($0.6 | ) | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 48.1 | (9.8 | ) | |||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | |||||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | 1 | ||||||||||||||||||||||||||||||
Purchases | 7.9 | 4.8 | ||||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (13.8 | ) | (6.4 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at September 30 (a) | $40.60 | ($9.8 | ) | |||||||||||||||||||||||||||||
(a) | Unrealized gains and losses related to derivative assets and derivative liabilities are recorded in regulatory assets and regulatory liabilities on the balance sheets. | |||||||||||||||||||||||||||||||
(b) | Markets for similar assets and liabilities became inactive and observable market inputs became unavailable for transfers into Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
(c) | Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold. | |||||||||||||||||||||||||||||||
(d) | Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
Fair Value Of Net Derivative Assets (Liabilities) | ' | |||||||||||||||||||||||||||||||
The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
Excluding FTRs | FTRs | Excluding FTRs | FTRs | Excluding FTRs | FTRs | |||||||||||||||||||||||||||
September 30, 2014 | $29.70 | $38.60 | $3.30 | $33.20 | $26.40 | $5.40 | ||||||||||||||||||||||||||
31-Dec-13 | (13.9 | ) | 18.3 | (2.1 | ) | 16.7 | (11.8 | ) | 1.6 | |||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||||||||||
Statement [Line Items] | ' | |||||||||||||||||||||||||||||||
Carrying Amount and Fair Value Of Financial Instruments | ' | |||||||||||||||||||||||||||||||
Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
September 30, 2014 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $83.10 | $83.10 | $44.70 | $44.70 | $38.40 | $38.40 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 160.3 | 160.3 | 160.3 | 160.3 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,292.30 | 3,852.60 | 1,520.30 | 1,778.20 | 1,324.00 | 1,618.00 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 200.2 | 200 | 200.2 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 14.1 | 14.1 | 8.2 | 8.2 | 5.9 | 5.9 | ||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
December 31, 2013 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $26.70 | $26.70 | $21.10 | $21.10 | $5.60 | $5.60 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 203.5 | 203.5 | 203.5 | 203.5 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,336.30 | 3,712.30 | 1,558.40 | 1,726.40 | 1,332.10 | 1,532.90 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 167 | 200 | 167 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 20.8 | 20.8 | 5.2 | 5.2 | 15.6 | 15.6 | ||||||||||||||||||||||||||
Fair Value Measurements | ' | |||||||||||||||||||||||||||||||
Items subject to fair value measurement disclosure requirements were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $83.10 | $— | $6.30 | $76.80 | $26.70 | $— | $4.70 | $22.00 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 3,852.60 | — | 3,849.30 | 3.3 | 3,712.30 | — | 3,711.80 | 0.5 | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 14.1 | — | 5.6 | 8.5 | 20.8 | — | 3.2 | 17.6 | ||||||||||||||||||||||||
IPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $44.70 | $— | $4.30 | $40.40 | $21.10 | $— | $3.00 | $18.10 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,778.20 | — | 1,778.20 | — | 1,726.40 | — | 1,726.40 | — | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 8.2 | — | 4.3 | 3.9 | 5.2 | — | 1.7 | 3.5 | ||||||||||||||||||||||||
WPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $38.40 | $— | $2.00 | $36.40 | $5.60 | $— | $1.70 | $3.90 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,618.00 | — | 1,618.00 | — | 1,532.90 | — | 1,532.90 | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 5.9 | — | 1.3 | 4.6 | 15.6 | — | 1.5 | 14.1 | ||||||||||||||||||||||||
Fair Value Measurements Using Significant Unobservable Inputs | ' | |||||||||||||||||||||||||||||||
Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $101.20 | $42.50 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (12.7 | ) | 0.1 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.9 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (19.0 | ) | (15.5 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($10.3 | ) | $0.10 | $— | $— | |||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $4.40 | $11.90 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 43 | (8.3 | ) | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (0.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 76.7 | 50.9 | — | — | ||||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (54.6 | ) | (36.4 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | $34.60 | ($8.3 | ) | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $64.20 | $40.60 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (10.1 | ) | 2 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.1 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (16.6 | ) | (13.9 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($9.6 | ) | $2.00 | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $14.60 | $12.50 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (5.1 | ) | 1.5 | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (1.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 68.8 | 46.1 | — | — | ||||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (40.8 | ) | (30.0 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($6.0 | ) | $1.50 | $— | $— | |||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, July 1 | $37.00 | $1.90 | ||||||||||||||||||||||||||||||
Total net losses (realized/unrealized) included in changes in net assets (a) | (2.6 | ) | (1.9 | ) | ||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.8 | ) | |||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (2.4 | ) | (1.6 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30 (a) | ($0.7 | ) | ($1.9 | ) | ||||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, January 1 | ($10.2 | ) | ($0.6 | ) | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 48.1 | (9.8 | ) | |||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | |||||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | 1 | ||||||||||||||||||||||||||||||
Purchases | 7.9 | 4.8 | ||||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (13.8 | ) | (6.4 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at September 30 (a) | $40.60 | ($9.8 | ) | |||||||||||||||||||||||||||||
(a) | Unrealized gains and losses related to derivative assets and derivative liabilities are recorded in regulatory assets and regulatory liabilities on the balance sheets. | |||||||||||||||||||||||||||||||
(b) | Markets for similar assets and liabilities became inactive and observable market inputs became unavailable for transfers into Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
(c) | Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold. | |||||||||||||||||||||||||||||||
(d) | Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
Fair Value Of Net Derivative Assets (Liabilities) | ' | |||||||||||||||||||||||||||||||
The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
Excluding FTRs | FTRs | Excluding FTRs | FTRs | Excluding FTRs | FTRs | |||||||||||||||||||||||||||
September 30, 2014 | $29.70 | $38.60 | $3.30 | $33.20 | $26.40 | $5.40 | ||||||||||||||||||||||||||
31-Dec-13 | (13.9 | ) | 18.3 | (2.1 | ) | 16.7 | (11.8 | ) | 1.6 | |||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||||||||||
Statement [Line Items] | ' | |||||||||||||||||||||||||||||||
Carrying Amount and Fair Value Of Financial Instruments | ' | |||||||||||||||||||||||||||||||
Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
September 30, 2014 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $83.10 | $83.10 | $44.70 | $44.70 | $38.40 | $38.40 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 160.3 | 160.3 | 160.3 | 160.3 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,292.30 | 3,852.60 | 1,520.30 | 1,778.20 | 1,324.00 | 1,618.00 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 200.2 | 200 | 200.2 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 14.1 | 14.1 | 8.2 | 8.2 | 5.9 | 5.9 | ||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
December 31, 2013 | Carrying | Fair | Carrying | Fair | Carrying | Fair | ||||||||||||||||||||||||||
Amount | Value | Amount | Value | Amount | Value | |||||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivative assets (Note 13) | $26.70 | $26.70 | $21.10 | $21.10 | $5.60 | $5.60 | ||||||||||||||||||||||||||
Deferred proceeds (sales of receivables) (Note 4(a)) | 203.5 | 203.5 | 203.5 | 203.5 | — | — | ||||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) (Note 8(b)) | 3,336.30 | 3,712.30 | 1,558.40 | 1,726.40 | 1,332.10 | 1,532.90 | ||||||||||||||||||||||||||
Cumulative preferred stock (Note 7) | 200 | 167 | 200 | 167 | — | — | ||||||||||||||||||||||||||
Derivative liabilities (Note 13) | 20.8 | 20.8 | 5.2 | 5.2 | 15.6 | 15.6 | ||||||||||||||||||||||||||
Fair Value Measurements | ' | |||||||||||||||||||||||||||||||
Items subject to fair value measurement disclosure requirements were as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $83.10 | $— | $6.30 | $76.80 | $26.70 | $— | $4.70 | $22.00 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 3,852.60 | — | 3,849.30 | 3.3 | 3,712.30 | — | 3,711.80 | 0.5 | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 14.1 | — | 5.6 | 8.5 | 20.8 | — | 3.2 | 17.6 | ||||||||||||||||||||||||
IPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $44.70 | $— | $4.30 | $40.40 | $21.10 | $— | $3.00 | $18.10 | ||||||||||||||||||||||||
Deferred proceeds | 160.3 | — | — | 160.3 | 203.5 | — | — | 203.5 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,778.20 | — | 1,778.20 | — | 1,726.40 | — | 1,726.40 | — | ||||||||||||||||||||||||
Cumulative preferred stock | 200.2 | 200.2 | — | — | 167 | 167 | — | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 8.2 | — | 4.3 | 3.9 | 5.2 | — | 1.7 | 3.5 | ||||||||||||||||||||||||
WPL | September 30, 2014 | December 31, 2013 | ||||||||||||||||||||||||||||||
Fair | Level | Level | Level | Fair | Level | Level | Level | |||||||||||||||||||||||||
Value | 1 | 2 | 3 | Value | 1 | 2 | 3 | |||||||||||||||||||||||||
Assets: | ||||||||||||||||||||||||||||||||
Derivatives - commodity contracts | $38.40 | $— | $2.00 | $36.40 | $5.60 | $— | $1.70 | $3.90 | ||||||||||||||||||||||||
Capitalization and liabilities: | ||||||||||||||||||||||||||||||||
Long-term debt (including current maturities) | 1,618.00 | — | 1,618.00 | — | 1,532.90 | — | 1,532.90 | — | ||||||||||||||||||||||||
Derivatives - commodity contracts | 5.9 | — | 1.3 | 4.6 | 15.6 | — | 1.5 | 14.1 | ||||||||||||||||||||||||
Fair Value Measurements Using Significant Unobservable Inputs | ' | |||||||||||||||||||||||||||||||
Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $101.20 | $42.50 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (12.7 | ) | 0.1 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.9 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (19.0 | ) | (15.5 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($10.3 | ) | $0.10 | $— | $— | |||||||||||||||||||||||||||
Alliant Energy | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $4.40 | $11.90 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 43 | (8.3 | ) | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (0.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 76.7 | 50.9 | — | — | ||||||||||||||||||||||||||||
Sales | (1.2 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (54.6 | ) | (36.4 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $68.30 | $17.20 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | $34.60 | ($8.3 | ) | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, July 1 | $64.20 | $40.60 | $193.70 | $69.30 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (10.1 | ) | 2 | — | — | |||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.1 | ) | — | — | |||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (16.6 | ) | (13.9 | ) | (33.4 | ) | 17.6 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($9.6 | ) | $2.00 | $— | $— | |||||||||||||||||||||||||||
IPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | Deferred Proceeds | |||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | 2014 | 2013 | ||||||||||||||||||||||||||||
Beginning balance, January 1 | $14.60 | $12.50 | $203.50 | $66.80 | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (5.1 | ) | 1.5 | — | — | |||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | (1.5 | ) | — | — | |||||||||||||||||||||||||||
Purchases | 68.8 | 46.1 | — | — | ||||||||||||||||||||||||||||
Sales | (1.0 | ) | — | — | — | |||||||||||||||||||||||||||
Settlements (c) | (40.8 | ) | (30.0 | ) | (43.2 | ) | 20.1 | |||||||||||||||||||||||||
Ending balance, September 30 | $36.50 | $28.60 | $160.30 | $86.90 | ||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 (a) | ($6.0 | ) | $1.50 | $— | $— | |||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Three Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, July 1 | $37.00 | $1.90 | ||||||||||||||||||||||||||||||
Total net losses (realized/unrealized) included in changes in net assets (a) | (2.6 | ) | (1.9 | ) | ||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (9.8 | ) | |||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (2.4 | ) | (1.6 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30 (a) | ($0.7 | ) | ($1.9 | ) | ||||||||||||||||||||||||||||
WPL | Commodity Contract Derivative | |||||||||||||||||||||||||||||||
Assets and (Liabilities), net | ||||||||||||||||||||||||||||||||
Nine Months Ended September 30 | 2014 | 2013 | ||||||||||||||||||||||||||||||
Beginning balance, January 1 | ($10.2 | ) | ($0.6 | ) | ||||||||||||||||||||||||||||
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | 48.1 | (9.8 | ) | |||||||||||||||||||||||||||||
Transfers into Level 3 (b) | — | (0.4 | ) | |||||||||||||||||||||||||||||
Transfers out of Level 3 (d) | — | 1 | ||||||||||||||||||||||||||||||
Purchases | 7.9 | 4.8 | ||||||||||||||||||||||||||||||
Sales | (0.2 | ) | — | |||||||||||||||||||||||||||||
Settlements | (13.8 | ) | (6.4 | ) | ||||||||||||||||||||||||||||
Ending balance, September 30 | $31.80 | ($11.4 | ) | |||||||||||||||||||||||||||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at September 30 (a) | $40.60 | ($9.8 | ) | |||||||||||||||||||||||||||||
(a) | Unrealized gains and losses related to derivative assets and derivative liabilities are recorded in regulatory assets and regulatory liabilities on the balance sheets. | |||||||||||||||||||||||||||||||
(b) | Markets for similar assets and liabilities became inactive and observable market inputs became unavailable for transfers into Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
(c) | Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold. | |||||||||||||||||||||||||||||||
(d) | Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period. | |||||||||||||||||||||||||||||||
Fair Value Of Net Derivative Assets (Liabilities) | ' | |||||||||||||||||||||||||||||||
The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions): | ||||||||||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||||||||||
Excluding FTRs | FTRs | Excluding FTRs | FTRs | Excluding FTRs | FTRs | |||||||||||||||||||||||||||
September 30, 2014 | $29.70 | $38.60 | $3.30 | $33.20 | $26.40 | $5.40 | ||||||||||||||||||||||||||
31-Dec-13 | (13.9 | ) | 18.3 | (2.1 | ) | 16.7 | (11.8 | ) | 1.6 | |||||||||||||||||||||||
Derivative_Instruments_Tables
Derivative Instruments (Tables) | 9 Months Ended | |||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||
Derivative Instruments [Line Items] | ' | |||||||||||||||||||||||
Notional Amounts Of Derivative Instruments | ' | |||||||||||||||||||||||
As of September 30, 2014, gross notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands): | ||||||||||||||||||||||||
2014 | 2015 | 2016 | 2017 | 2018 | Total | |||||||||||||||||||
Alliant Energy | ||||||||||||||||||||||||
Electricity (MWhs) | 2,092 | 3,946 | 1,553 | 1,314 | 1,314 | 10,219 | ||||||||||||||||||
FTRs (MWhs) | 5,673 | 9,560 | — | — | — | 15,233 | ||||||||||||||||||
Natural gas (Dths) | 25,806 | 36,532 | 8,805 | 218 | — | 71,361 | ||||||||||||||||||
Coal (tons) | 836 | 1,490 | 1,899 | 1,073 | 1,113 | 6,411 | ||||||||||||||||||
IPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 1,678 | — | — | — | 2,724 | ||||||||||||||||||
FTRs (MWhs) | 3,340 | 5,558 | — | — | — | 8,898 | ||||||||||||||||||
Natural gas (Dths) | 17,823 | 25,776 | 3,862 | 218 | — | 47,679 | ||||||||||||||||||
Coal (tons) | 266 | 75 | 830 | 274 | 387 | 1,832 | ||||||||||||||||||
WPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 2,268 | 1,553 | 1,314 | 1,314 | 7,495 | ||||||||||||||||||
FTRs (MWhs) | 2,333 | 4,002 | — | — | — | 6,335 | ||||||||||||||||||
Natural gas (Dths) | 7,983 | 10,756 | 4,943 | — | — | 23,682 | ||||||||||||||||||
Coal (tons) | 570 | 1,415 | 1,069 | 799 | 726 | 4,579 | ||||||||||||||||||
Fair Value Of Financial Instruments | ' | |||||||||||||||||||||||
The fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other long-term liabilities and deferred credits” on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Commodity contracts | September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | ||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Current derivative assets | $63.90 | $25.60 | $44.00 | $20.20 | $19.90 | $5.40 | ||||||||||||||||||
Non-current derivative assets | 19.2 | 1.1 | 0.7 | 0.9 | 18.5 | 0.2 | ||||||||||||||||||
Current derivative liabilities | 9 | 6.7 | 5.2 | 3 | 3.8 | 3.7 | ||||||||||||||||||
Non-current derivative liabilities | 5.1 | 14.1 | 3 | 2.2 | 2.1 | 11.9 | ||||||||||||||||||
Gains And Losses From Derivative Instruments | ' | |||||||||||||||||||||||
Changes in unrealized gains (losses) from commodity derivative instruments were recorded with offsets to regulatory assets or regulatory liabilities on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Three Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | $8.30 | $2.20 | $7.30 | ($0.4 | ) | $1.00 | $2.60 | |||||||||||||||||
Regulatory liabilities | (6.2 | ) | (1.0 | ) | (2.0 | ) | 3.6 | (4.2 | ) | (4.6 | ) | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | 13.8 | (14.2 | ) | 8.7 | (4.6 | ) | 5.1 | (9.6 | ) | |||||||||||||||
Regulatory liabilities | 63.2 | 16.6 | 13.9 | 9.9 | 49.3 | 6.7 | ||||||||||||||||||
Credit Risk-related Contingent Features | ' | |||||||||||||||||||||||
The aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position, as well as amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered, were as follows (in millions): | ||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||
Alliant Energy | IPL | WPL | Alliant Energy | IPL | WPL | |||||||||||||||||||
Aggregate fair value | $14.10 | $8.20 | $5.90 | $20.80 | $5.20 | $15.60 | ||||||||||||||||||
Credit support to be posted if triggered | 13.9 | 8.2 | 5.7 | 20.8 | 5.2 | 15.6 | ||||||||||||||||||
Balance Sheet Offsetting | ' | |||||||||||||||||||||||
The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Gross | Gross | Gross | ||||||||||||||||||||||
(as reported) | Net | (as reported) | Net | (as reported) | Net | |||||||||||||||||||
September 30, 2014 | ||||||||||||||||||||||||
Derivative assets | $83.10 | $72.20 | $44.70 | $39.80 | $38.40 | $32.40 | ||||||||||||||||||
Derivative liabilities | 14.1 | 7.9 | 8.2 | 3.6 | 5.9 | 4.3 | ||||||||||||||||||
31-Dec-13 | ||||||||||||||||||||||||
Derivative assets | 26.7 | 23.5 | 21.1 | 19.5 | 5.6 | 4 | ||||||||||||||||||
Derivative liabilities | 20.8 | 17.6 | 5.2 | 3.6 | 15.6 | 14 | ||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||
Derivative Instruments [Line Items] | ' | |||||||||||||||||||||||
Notional Amounts Of Derivative Instruments | ' | |||||||||||||||||||||||
As of September 30, 2014, gross notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands): | ||||||||||||||||||||||||
2014 | 2015 | 2016 | 2017 | 2018 | Total | |||||||||||||||||||
Alliant Energy | ||||||||||||||||||||||||
Electricity (MWhs) | 2,092 | 3,946 | 1,553 | 1,314 | 1,314 | 10,219 | ||||||||||||||||||
FTRs (MWhs) | 5,673 | 9,560 | — | — | — | 15,233 | ||||||||||||||||||
Natural gas (Dths) | 25,806 | 36,532 | 8,805 | 218 | — | 71,361 | ||||||||||||||||||
Coal (tons) | 836 | 1,490 | 1,899 | 1,073 | 1,113 | 6,411 | ||||||||||||||||||
IPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 1,678 | — | — | — | 2,724 | ||||||||||||||||||
FTRs (MWhs) | 3,340 | 5,558 | — | — | — | 8,898 | ||||||||||||||||||
Natural gas (Dths) | 17,823 | 25,776 | 3,862 | 218 | — | 47,679 | ||||||||||||||||||
Coal (tons) | 266 | 75 | 830 | 274 | 387 | 1,832 | ||||||||||||||||||
WPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 2,268 | 1,553 | 1,314 | 1,314 | 7,495 | ||||||||||||||||||
FTRs (MWhs) | 2,333 | 4,002 | — | — | — | 6,335 | ||||||||||||||||||
Natural gas (Dths) | 7,983 | 10,756 | 4,943 | — | — | 23,682 | ||||||||||||||||||
Coal (tons) | 570 | 1,415 | 1,069 | 799 | 726 | 4,579 | ||||||||||||||||||
Fair Value Of Financial Instruments | ' | |||||||||||||||||||||||
The fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other long-term liabilities and deferred credits” on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Commodity contracts | September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | ||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Current derivative assets | $63.90 | $25.60 | $44.00 | $20.20 | $19.90 | $5.40 | ||||||||||||||||||
Non-current derivative assets | 19.2 | 1.1 | 0.7 | 0.9 | 18.5 | 0.2 | ||||||||||||||||||
Current derivative liabilities | 9 | 6.7 | 5.2 | 3 | 3.8 | 3.7 | ||||||||||||||||||
Non-current derivative liabilities | 5.1 | 14.1 | 3 | 2.2 | 2.1 | 11.9 | ||||||||||||||||||
Gains And Losses From Derivative Instruments | ' | |||||||||||||||||||||||
Changes in unrealized gains (losses) from commodity derivative instruments were recorded with offsets to regulatory assets or regulatory liabilities on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Three Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | $8.30 | $2.20 | $7.30 | ($0.4 | ) | $1.00 | $2.60 | |||||||||||||||||
Regulatory liabilities | (6.2 | ) | (1.0 | ) | (2.0 | ) | 3.6 | (4.2 | ) | (4.6 | ) | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | 13.8 | (14.2 | ) | 8.7 | (4.6 | ) | 5.1 | (9.6 | ) | |||||||||||||||
Regulatory liabilities | 63.2 | 16.6 | 13.9 | 9.9 | 49.3 | 6.7 | ||||||||||||||||||
Credit Risk-related Contingent Features | ' | |||||||||||||||||||||||
The aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position, as well as amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered, were as follows (in millions): | ||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||
Alliant Energy | IPL | WPL | Alliant Energy | IPL | WPL | |||||||||||||||||||
Aggregate fair value | $14.10 | $8.20 | $5.90 | $20.80 | $5.20 | $15.60 | ||||||||||||||||||
Credit support to be posted if triggered | 13.9 | 8.2 | 5.7 | 20.8 | 5.2 | 15.6 | ||||||||||||||||||
Balance Sheet Offsetting | ' | |||||||||||||||||||||||
The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Gross | Gross | Gross | ||||||||||||||||||||||
(as reported) | Net | (as reported) | Net | (as reported) | Net | |||||||||||||||||||
September 30, 2014 | ||||||||||||||||||||||||
Derivative assets | $83.10 | $72.20 | $44.70 | $39.80 | $38.40 | $32.40 | ||||||||||||||||||
Derivative liabilities | 14.1 | 7.9 | 8.2 | 3.6 | 5.9 | 4.3 | ||||||||||||||||||
31-Dec-13 | ||||||||||||||||||||||||
Derivative assets | 26.7 | 23.5 | 21.1 | 19.5 | 5.6 | 4 | ||||||||||||||||||
Derivative liabilities | 20.8 | 17.6 | 5.2 | 3.6 | 15.6 | 14 | ||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||
Derivative Instruments [Line Items] | ' | |||||||||||||||||||||||
Notional Amounts Of Derivative Instruments | ' | |||||||||||||||||||||||
As of September 30, 2014, gross notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands): | ||||||||||||||||||||||||
2014 | 2015 | 2016 | 2017 | 2018 | Total | |||||||||||||||||||
Alliant Energy | ||||||||||||||||||||||||
Electricity (MWhs) | 2,092 | 3,946 | 1,553 | 1,314 | 1,314 | 10,219 | ||||||||||||||||||
FTRs (MWhs) | 5,673 | 9,560 | — | — | — | 15,233 | ||||||||||||||||||
Natural gas (Dths) | 25,806 | 36,532 | 8,805 | 218 | — | 71,361 | ||||||||||||||||||
Coal (tons) | 836 | 1,490 | 1,899 | 1,073 | 1,113 | 6,411 | ||||||||||||||||||
IPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 1,678 | — | — | — | 2,724 | ||||||||||||||||||
FTRs (MWhs) | 3,340 | 5,558 | — | — | — | 8,898 | ||||||||||||||||||
Natural gas (Dths) | 17,823 | 25,776 | 3,862 | 218 | — | 47,679 | ||||||||||||||||||
Coal (tons) | 266 | 75 | 830 | 274 | 387 | 1,832 | ||||||||||||||||||
WPL | ||||||||||||||||||||||||
Electricity (MWhs) | 1,046 | 2,268 | 1,553 | 1,314 | 1,314 | 7,495 | ||||||||||||||||||
FTRs (MWhs) | 2,333 | 4,002 | — | — | — | 6,335 | ||||||||||||||||||
Natural gas (Dths) | 7,983 | 10,756 | 4,943 | — | — | 23,682 | ||||||||||||||||||
Coal (tons) | 570 | 1,415 | 1,069 | 799 | 726 | 4,579 | ||||||||||||||||||
Fair Value Of Financial Instruments | ' | |||||||||||||||||||||||
The fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other long-term liabilities and deferred credits” on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Commodity contracts | September 30, | December 31, | September 30, | December 31, | September 30, | December 31, | ||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Current derivative assets | $63.90 | $25.60 | $44.00 | $20.20 | $19.90 | $5.40 | ||||||||||||||||||
Non-current derivative assets | 19.2 | 1.1 | 0.7 | 0.9 | 18.5 | 0.2 | ||||||||||||||||||
Current derivative liabilities | 9 | 6.7 | 5.2 | 3 | 3.8 | 3.7 | ||||||||||||||||||
Non-current derivative liabilities | 5.1 | 14.1 | 3 | 2.2 | 2.1 | 11.9 | ||||||||||||||||||
Gains And Losses From Derivative Instruments | ' | |||||||||||||||||||||||
Changes in unrealized gains (losses) from commodity derivative instruments were recorded with offsets to regulatory assets or regulatory liabilities on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||
Three Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | $8.30 | $2.20 | $7.30 | ($0.4 | ) | $1.00 | $2.60 | |||||||||||||||||
Regulatory liabilities | (6.2 | ) | (1.0 | ) | (2.0 | ) | 3.6 | (4.2 | ) | (4.6 | ) | |||||||||||||
Nine Months Ended September 30 | ||||||||||||||||||||||||
Regulatory assets | 13.8 | (14.2 | ) | 8.7 | (4.6 | ) | 5.1 | (9.6 | ) | |||||||||||||||
Regulatory liabilities | 63.2 | 16.6 | 13.9 | 9.9 | 49.3 | 6.7 | ||||||||||||||||||
Credit Risk-related Contingent Features | ' | |||||||||||||||||||||||
The aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position, as well as amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered, were as follows (in millions): | ||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||
Alliant Energy | IPL | WPL | Alliant Energy | IPL | WPL | |||||||||||||||||||
Aggregate fair value | $14.10 | $8.20 | $5.90 | $20.80 | $5.20 | $15.60 | ||||||||||||||||||
Credit support to be posted if triggered | 13.9 | 8.2 | 5.7 | 20.8 | 5.2 | 15.6 | ||||||||||||||||||
Balance Sheet Offsetting | ' | |||||||||||||||||||||||
The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions): | ||||||||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||||||||
Gross | Gross | Gross | ||||||||||||||||||||||
(as reported) | Net | (as reported) | Net | (as reported) | Net | |||||||||||||||||||
September 30, 2014 | ||||||||||||||||||||||||
Derivative assets | $83.10 | $72.20 | $44.70 | $39.80 | $38.40 | $32.40 | ||||||||||||||||||
Derivative liabilities | 14.1 | 7.9 | 8.2 | 3.6 | 5.9 | 4.3 | ||||||||||||||||||
31-Dec-13 | ||||||||||||||||||||||||
Derivative assets | 26.7 | 23.5 | 21.1 | 19.5 | 5.6 | 4 | ||||||||||||||||||
Derivative liabilities | 20.8 | 17.6 | 5.2 | 3.6 | 15.6 | 14 | ||||||||||||||||||
Commitments_And_Contingencies_
Commitments And Contingencies (Tables) | 9 Months Ended | |||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||
Commitments and Contingencies [Line Items] | ' | |||||||||||||||||
Operating Expense Purchase Obligations | ' | |||||||||||||||||
At September 30, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Purchased power (a): | ||||||||||||||||||
DAEC (IPL) | $1,557 | $1,557 | $— | |||||||||||||||
Other | 221 | 1 | 220 | |||||||||||||||
1,778 | 1,558 | 220 | ||||||||||||||||
Natural gas | 341 | 191 | 150 | |||||||||||||||
Coal (b) | 265 | 128 | 137 | |||||||||||||||
SO2 emission allowances | 34 | 34 | — | |||||||||||||||
Other (c) | 20 | 11 | 7 | |||||||||||||||
$2,438 | $1,922 | $514 | ||||||||||||||||
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. | |||||||||||||||||
(b) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of September 30, 2014 regarding expected future usage, which is subject to change. | |||||||||||||||||
(c) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2014. | |||||||||||||||||
MGP Site Estimated Future Costs And Recorded Liabilities | ' | |||||||||||||||||
At September 30, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Range of estimated future costs | $13 | - | $32 | $12 | - | $30 | $1 | - | $2 | |||||||||
Current and non-current environmental liabilities | 19 | 17 | 2 | |||||||||||||||
IPL [Member] | ' | |||||||||||||||||
Commitments and Contingencies [Line Items] | ' | |||||||||||||||||
Operating Expense Purchase Obligations | ' | |||||||||||||||||
At September 30, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Purchased power (a): | ||||||||||||||||||
DAEC (IPL) | $1,557 | $1,557 | $— | |||||||||||||||
Other | 221 | 1 | 220 | |||||||||||||||
1,778 | 1,558 | 220 | ||||||||||||||||
Natural gas | 341 | 191 | 150 | |||||||||||||||
Coal (b) | 265 | 128 | 137 | |||||||||||||||
SO2 emission allowances | 34 | 34 | — | |||||||||||||||
Other (c) | 20 | 11 | 7 | |||||||||||||||
$2,438 | $1,922 | $514 | ||||||||||||||||
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. | |||||||||||||||||
(b) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of September 30, 2014 regarding expected future usage, which is subject to change. | |||||||||||||||||
(c) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2014. | |||||||||||||||||
MGP Site Estimated Future Costs And Recorded Liabilities | ' | |||||||||||||||||
At September 30, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Range of estimated future costs | $13 | - | $32 | $12 | - | $30 | $1 | - | $2 | |||||||||
Current and non-current environmental liabilities | 19 | 17 | 2 | |||||||||||||||
WPL [Member] | ' | |||||||||||||||||
Commitments and Contingencies [Line Items] | ' | |||||||||||||||||
Operating Expense Purchase Obligations | ' | |||||||||||||||||
At September 30, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Purchased power (a): | ||||||||||||||||||
DAEC (IPL) | $1,557 | $1,557 | $— | |||||||||||||||
Other | 221 | 1 | 220 | |||||||||||||||
1,778 | 1,558 | 220 | ||||||||||||||||
Natural gas | 341 | 191 | 150 | |||||||||||||||
Coal (b) | 265 | 128 | 137 | |||||||||||||||
SO2 emission allowances | 34 | 34 | — | |||||||||||||||
Other (c) | 20 | 11 | 7 | |||||||||||||||
$2,438 | $1,922 | $514 | ||||||||||||||||
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. | |||||||||||||||||
(b) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of September 30, 2014 regarding expected future usage, which is subject to change. | |||||||||||||||||
(c) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2014. | |||||||||||||||||
MGP Site Estimated Future Costs And Recorded Liabilities | ' | |||||||||||||||||
At September 30, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions): | ||||||||||||||||||
Alliant Energy | IPL | WPL | ||||||||||||||||
Range of estimated future costs | $13 | - | $32 | $12 | - | $30 | $1 | - | $2 | |||||||||
Current and non-current environmental liabilities | 19 | 17 | 2 |
Segments_Of_Business_Tables
Segments Of Business (Tables) | 9 Months Ended | |||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||
Segment Reporting Information [Line Items] | ' | |||||||||||||||||||||||
Schedule Of Segments Of Business | ' | |||||||||||||||||||||||
Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations. | ||||||||||||||||||||||||
Utilities | Non-Regulated, | Alliant Energy | ||||||||||||||||||||||
Electric | Gas | Other | Total | Parent and Other | Consolidated | |||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $771.20 | $47.20 | $12.20 | $830.60 | $12.50 | $843.10 | ||||||||||||||||||
Operating income (loss) | 190.8 | (4.4 | ) | 1.4 | 187.8 | 7 | 194.8 | |||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income (loss) from continuing operations, net of tax | 164.1 | (8.9 | ) | 155.2 | ||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (1.9 | ) | (1.9 | ) | |||||||||||||||||||
Net income (loss) attributable to Alliant Energy common shareowners | 164.1 | (10.8 | ) | 153.3 | ||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $798.10 | $39.80 | $17.40 | $855.30 | $11.30 | $866.60 | ||||||||||||||||||
Operating income (loss) | 199.6 | (3.4 | ) | (0.3 | ) | 195.9 | 5.5 | 201.4 | ||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income (loss) from continuing operations, net of tax | 171.3 | (12.4 | ) | 158.9 | ||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (1.3 | ) | (1.3 | ) | |||||||||||||||||||
Net income (loss) attributable to Alliant Energy common shareowners | 171.3 | (13.7 | ) | 157.6 | ||||||||||||||||||||
Utilities | Non-Regulated, | Alliant Energy | ||||||||||||||||||||||
Electric | Gas | Other | Total | Parent and Other | Consolidated | |||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $2,090.90 | $364.80 | $50.60 | $2,506.30 | $39.90 | $2,546.20 | ||||||||||||||||||
Operating income | 374.2 | 41.3 | 11.5 | 427 | 25.3 | 452.3 | ||||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income from continuing operations, net of tax | 315.3 | 10 | 325.3 | |||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (2.2 | ) | (2.2 | ) | |||||||||||||||||||
Net income attributable to Alliant Energy common shareowners | 315.3 | 7.8 | 323.1 | |||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $2,043.40 | $310.50 | $52.40 | $2,406.30 | $37.90 | $2,444.20 | ||||||||||||||||||
Operating income | 359.1 | 39.5 | 5.5 | 404.1 | 21.2 | 425.3 | ||||||||||||||||||
Amounts attributable to Alliant Energy common shareowners: | ||||||||||||||||||||||||
Income from continuing operations, net of tax | 292.8 | 4.9 | 297.7 | |||||||||||||||||||||
Loss from discontinued operations, net of tax | — | (4.9 | ) | (4.9 | ) | |||||||||||||||||||
Net income attributable to Alliant Energy common shareowners | 292.8 | — | 292.8 | |||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||
Segment Reporting Information [Line Items] | ' | |||||||||||||||||||||||
Schedule Of Segments Of Business | ' | |||||||||||||||||||||||
Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations. | ||||||||||||||||||||||||
Electric | Gas | Other | Total | |||||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $435.90 | $28.70 | $11.60 | $476.20 | ||||||||||||||||||||
Operating income (loss) | 94.7 | (2.8 | ) | 2 | 93.9 | |||||||||||||||||||
Earnings available for common stock | 102.5 | |||||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $457.60 | $24.60 | $12.20 | $494.40 | ||||||||||||||||||||
Operating income (loss) | 99.6 | (0.7 | ) | 1.1 | 100 | |||||||||||||||||||
Earnings available for common stock | 110 | |||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $1,164.70 | $208.10 | $44.20 | $1,417.00 | ||||||||||||||||||||
Operating income | 150.2 | 22.1 | 13.1 | 185.4 | ||||||||||||||||||||
Earnings available for common stock | 164.3 | |||||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $1,137.40 | $180.90 | $37.40 | $1,355.70 | ||||||||||||||||||||
Operating income | 146.2 | 22.6 | 7 | 175.8 | ||||||||||||||||||||
Earnings available for common stock | 155.1 | |||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||
Segment Reporting Information [Line Items] | ' | |||||||||||||||||||||||
Schedule Of Segments Of Business | ' | |||||||||||||||||||||||
Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations. | ||||||||||||||||||||||||
Electric | Gas | Other | Total | |||||||||||||||||||||
(in millions) | ||||||||||||||||||||||||
Three Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $335.30 | $18.50 | $0.60 | $354.40 | ||||||||||||||||||||
Operating income (loss) | 96.1 | (1.6 | ) | (0.6 | ) | 93.9 | ||||||||||||||||||
Earnings available for common stock | 61.6 | |||||||||||||||||||||||
Three Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $340.50 | $15.20 | $5.20 | $360.90 | ||||||||||||||||||||
Operating income (loss) | 100 | (2.7 | ) | (1.4 | ) | 95.9 | ||||||||||||||||||
Earnings available for common stock | 61.3 | |||||||||||||||||||||||
Nine Months Ended September 30, 2014 | ||||||||||||||||||||||||
Operating revenues | $926.20 | $156.70 | $6.40 | $1,089.30 | ||||||||||||||||||||
Operating income (loss) | 224 | 19.2 | (1.6 | ) | 241.6 | |||||||||||||||||||
Earnings available for common stock | 151 | |||||||||||||||||||||||
Nine Months Ended September 30, 2013 | ||||||||||||||||||||||||
Operating revenues | $906.00 | $129.60 | $15.00 | $1,050.60 | ||||||||||||||||||||
Operating income (loss) | 212.9 | 16.9 | (1.5 | ) | 228.3 | |||||||||||||||||||
Earnings available for common stock | 137.7 | |||||||||||||||||||||||
Related_Parties_Tables
Related Parties (Tables) | 9 Months Ended | |||||||||||||||||||||||||||||||
Sep. 30, 2014 | ||||||||||||||||||||||||||||||||
Related Party Transactions [Line Items] | ' | |||||||||||||||||||||||||||||||
Services Provided, Sales Credited And Purchases Billed | ' | |||||||||||||||||||||||||||||||
The amounts billed for services provided, sales credited and purchases billed for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||
Corporate Services billings | $37 | $39 | $111 | $107 | $30 | $28 | $89 | $77 | ||||||||||||||||||||||||
Sales credited | 2 | 2 | 6 | 5 | 2 | 3 | 4 | 10 | ||||||||||||||||||||||||
Purchases billed | 106 | 108 | 313 | 260 | 34 | 16 | 92 | 44 | ||||||||||||||||||||||||
Net Intercompany Payables | ' | |||||||||||||||||||||||||||||||
Net intercompany payables to Corporate Services were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||||||||
Net payables to Corporate Services | $87 | $62 | $54 | $46 | ||||||||||||||||||||||||||||
Related Amounts Billed Between Parties | ' | |||||||||||||||||||||||||||||||
The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||||||||||||||||||
Three Months | Nine Months | |||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||
ATC billings to WPL | $24 | $24 | $72 | $72 | ||||||||||||||||||||||||||||
WPL billings to ATC | 3 | 2 | 7 | 9 | ||||||||||||||||||||||||||||
IPL [Member] | ' | |||||||||||||||||||||||||||||||
Related Party Transactions [Line Items] | ' | |||||||||||||||||||||||||||||||
Services Provided, Sales Credited And Purchases Billed | ' | |||||||||||||||||||||||||||||||
The amounts billed for services provided, sales credited and purchases billed for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||
Corporate Services billings | $37 | $39 | $111 | $107 | $30 | $28 | $89 | $77 | ||||||||||||||||||||||||
Sales credited | 2 | 2 | 6 | 5 | 2 | 3 | 4 | 10 | ||||||||||||||||||||||||
Purchases billed | 106 | 108 | 313 | 260 | 34 | 16 | 92 | 44 | ||||||||||||||||||||||||
Net Intercompany Payables | ' | |||||||||||||||||||||||||||||||
Net intercompany payables to Corporate Services were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||||||||
Net payables to Corporate Services | $87 | $62 | $54 | $46 | ||||||||||||||||||||||||||||
WPL [Member] | ' | |||||||||||||||||||||||||||||||
Related Party Transactions [Line Items] | ' | |||||||||||||||||||||||||||||||
Services Provided, Sales Credited And Purchases Billed | ' | |||||||||||||||||||||||||||||||
The amounts billed for services provided, sales credited and purchases billed for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
Three Months | Nine Months | Three Months | Nine Months | |||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | 2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||
Corporate Services billings | $37 | $39 | $111 | $107 | $30 | $28 | $89 | $77 | ||||||||||||||||||||||||
Sales credited | 2 | 2 | 6 | 5 | 2 | 3 | 4 | 10 | ||||||||||||||||||||||||
Purchases billed | 106 | 108 | 313 | 260 | 34 | 16 | 92 | 44 | ||||||||||||||||||||||||
Net Intercompany Payables | ' | |||||||||||||||||||||||||||||||
Net intercompany payables to Corporate Services were as follows (in millions): | ||||||||||||||||||||||||||||||||
IPL | WPL | |||||||||||||||||||||||||||||||
September 30, 2014 | December 31, 2013 | September 30, 2014 | December 31, 2013 | |||||||||||||||||||||||||||||
Net payables to Corporate Services | $87 | $62 | $54 | $46 | ||||||||||||||||||||||||||||
Related Amounts Billed Between Parties | ' | |||||||||||||||||||||||||||||||
The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions): | ||||||||||||||||||||||||||||||||
Three Months | Nine Months | |||||||||||||||||||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||||||||||||||||||
ATC billings to WPL | $24 | $24 | $72 | $72 | ||||||||||||||||||||||||||||
WPL billings to ATC | 3 | 2 | 7 | 9 | ||||||||||||||||||||||||||||
Discontinued_Operations_Tables
Discontinued Operations (Tables) | 9 Months Ended | |||||||||||||||
Sep. 30, 2014 | ||||||||||||||||
Discontinued Operations and Disposal Groups [Abstract] | ' | |||||||||||||||
Components Of Discontinued Operations In Income Statements | ' | |||||||||||||||
A summary of the components of discontinued operations in Alliant Energy’s income statements for the three and nine months ended September 30 was as follows (in millions): | ||||||||||||||||
Three Months | Nine Months | |||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||||
Operating revenues | $— | $— | $— | $0.90 | ||||||||||||
Operating expenses | 2.8 | 2.1 | 3.4 | 8.6 | ||||||||||||
Loss before income taxes | (2.8 | ) | (2.1 | ) | (3.4 | ) | (7.7 | ) | ||||||||
Income tax benefit | (0.9 | ) | (0.8 | ) | (1.2 | ) | (2.8 | ) | ||||||||
Loss from discontinued operations, net of tax | ($1.9 | ) | ($1.3 | ) | ($2.2 | ) | ($4.9 | ) | ||||||||
Regulatory_Matters_Narrative_D
Regulatory Matters (Narrative) (Details) (USD $) | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended | 1 Months Ended | 1 Months Ended | ||||||||||||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 | Dec. 31, 2014 | Jul. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Jun. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2013 | Sep. 30, 2014 |
change | WPL [Member] | WPL [Member] | IPL [Member] | IPL [Member] | IPL [Member] | Alliant Energy and IPL [Member] | Scenario, Forecast [Member] | 2015/2016 Test Period Retail Electric And Gas [Member] | 2013 Test Year Retail Electric [Member] | 2013 Test Year Retail Electric [Member] | 2013 Test Year Retail Electric [Member] | 2013 Test Year Retail Electric [Member] | 2013 Test Year Retail Electric [Member] | 2013 Test Year Retail Electric [Member] | 2015 Test Year Retail Electric Fuel Related Request [Member] | 2015 Test Year Retail Electric Fuel Related Request [Member] | 2015 Test Year Retail Electric Fuel Related Request [Member] | Fuel per MWh [Member] | Increased sales volumes [Member] | 2014 Test Year Retail Electric Fuel Related Request [Member] | 2014 Test Year Retail Electric Fuel Related Request [Member] | ||
Revenue Requirement Adjustment [Member] | Tax benefit riders [Member] | IPL [Member] | WPL [Member] | IPL [Member] | IPL [Member] | Scenario, Forecast [Member] | Scenario, Forecast [Member] | Scenario, Forecast [Member] | Scenario, Forecast [Member] | WPL [Member] | Scenario, Forecast [Member] | Scenario, Forecast [Member] | Scenario, Forecast [Member] | Scenario, Forecast [Member] | WPL [Member] | Alliant Energy and WPL [Member] | |||||||
Revenue Requirement Adjustment [Member] | IPL [Member] | IPL [Member] | IPL [Member] | IPL [Member] | WPL [Member] | WPL [Member] | WPL [Member] | WPL [Member] | |||||||||||||||
Regulatory Matters [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of tax accounting method changes (in number of changes) | 2 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Increase (decrease) in regulatory assets and regulatory liabilities | ' | ' | ' | ' | ' | ' | ' | $74 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Authorized increase (decrease) in final rates, amount | ' | ' | ' | ' | ' | ' | ' | ' | ' | -5 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 19 | ' |
Customer billing credits | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 26 | 46 | 10 | 25 | 70 | 105 | ' | ' | ' | ' | ' | ' | ' |
Increase (decrease) in regulatory liabilities | 61.1 | -74.9 | 46.3 | -6.6 | 14.8 | -68.3 | -24 | -73 | -15 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Requested increase (decrease) in rates, amount | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 55 | ' | ' | ' | ' | ' | ' |
Requested increase (decrease) in rates, percent | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 5.00% | ' | ' | ' | ' | ' | ' |
Fuel-related costs | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $41 | $14 | $28 | $13 | ' | $21 |
Authorized increase (decrease) in final rates, percent | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 2.00% | ' |
Annual bandwidth for fuel-related costs | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 2.00% | ' |
Regulatory_Matters_Regulatory_
Regulatory Matters (Regulatory Assets) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified | ||
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | $1,524.30 | $1,413.20 |
Tax-related [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 937.6 | 829.7 |
Pension and OPEB costs [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 345.4 | 355.3 |
AROs [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 74.6 | 65.7 |
Emission allowances [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 28 | 30 |
Environmental-related costs [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 26.6 | 25 |
Derivatives [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 23.3 | 21.1 |
Other [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 88.8 | 86.4 |
IPL [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 1,226.80 | 1,113.50 |
IPL [Member] | Tax-related [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 910.6 | 798.6 |
IPL [Member] | Pension and OPEB costs [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 170.2 | 174.2 |
IPL [Member] | AROs [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 43.1 | 36.7 |
IPL [Member] | Emission allowances [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 28 | 30 |
IPL [Member] | Environmental-related costs [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 22 | 21 |
IPL [Member] | Derivatives [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 17.7 | 5.9 |
IPL [Member] | Other [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 35.2 | 47.1 |
WPL [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 297.5 | 299.7 |
WPL [Member] | Tax-related [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 27 | 31.1 |
WPL [Member] | Pension and OPEB costs [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 175.2 | 181.1 |
WPL [Member] | AROs [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 31.5 | 29 |
WPL [Member] | Environmental-related costs [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 4.6 | 4 |
WPL [Member] | Derivatives [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | 5.6 | 15.2 |
WPL [Member] | Other [Member] | ' | ' |
Regulatory Assets [Line Items] | ' | ' |
Regulatory assets | $53.60 | $39.30 |
Regulatory_Matters_Regulatory_1
Regulatory Matters (Regulatory Liabilities) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified | ||
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | $876.80 | $821.50 |
Cost of removal obligations [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 422.7 | 418.9 |
IPL's tax benefit riders [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 266.3 | 265.4 |
Energy efficiency cost recovery [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 67.5 | 52.7 |
Derivatives [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 41.2 | 7.2 |
IPL's electric transmission cost recovery [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 14.1 | 14.6 |
IPL's electric transmission assets sale [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 13.7 | 21.6 |
Other [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 51.3 | 41.1 |
IPL [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 623.2 | 614.9 |
IPL [Member] | Cost of removal obligations [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 280.9 | 277.7 |
IPL [Member] | IPL's tax benefit riders [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 266.3 | 265.4 |
IPL [Member] | Energy efficiency cost recovery [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 8.6 | 9.3 |
IPL [Member] | Derivatives [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 8.4 | 3.6 |
IPL [Member] | IPL's electric transmission cost recovery [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 14.1 | 14.6 |
IPL [Member] | IPL's electric transmission assets sale [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 13.7 | 21.6 |
IPL [Member] | Other [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 31.2 | 22.7 |
WPL [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 253.6 | 206.6 |
WPL [Member] | Cost of removal obligations [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 141.8 | 141.2 |
WPL [Member] | Energy efficiency cost recovery [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 58.9 | 43.4 |
WPL [Member] | Derivatives [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | 32.8 | 3.6 |
WPL [Member] | Other [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Regulatory liabilities | $20.10 | $18.40 |
Regulatory_Matters_Regulatory_2
Regulatory Matters Regulatory Matters (Tax Benefit Riders) (Details) (USD $) | 9 Months Ended | |
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 |
Regulatory Liabilities [Line Items] | ' | ' |
Increase (decrease) in regulatory liabilities | $61.10 | ($74.90) |
Alliant Energy and IPL [Member] | Electric tax benefit rider [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Increase (decrease) in regulatory liabilities | -64 | ' |
Alliant Energy and IPL [Member] | Gas tax benefit rider [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Increase (decrease) in regulatory liabilities | -9 | ' |
Alliant Energy and IPL [Member] | Tax benefit riders [Member] | ' | ' |
Regulatory Liabilities [Line Items] | ' | ' |
Increase (decrease) in regulatory liabilities | ($73) | ' |
Regulatory_Matters_Regulatory_3
Regulatory Matters Regulatory Matters (Revenue Requirement Adjustment) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Revenue Requirement Adjustment [Line Items] | ' | ' | ' | ' |
Increase to electric revenues | $771.20 | $798.10 | $2,090.90 | $2,043.40 |
Alliant Energy and IPL [Member] | Revenue Requirement Adjustment [Member] | ' | ' | ' | ' |
Revenue Requirement Adjustment [Line Items] | ' | ' | ' | ' |
Increase to electric revenues | $4 | $7 | $11 | $18 |
Property_Plant_and_Equipment_N
Property, Plant and Equipment (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | |||||||||||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2014 |
IPL [Member] | IPL [Member] | IPL [Member] | IPL [Member] | IPL [Member] | George Neal Unit 3 [Member] | Ottumwa Unit 1 [Member] | Columbia Units 1 and 2 [Member] | Edgewater Unit 5 [Member] | Marshalltown [Member] | Marshalltown [Member] | Gas distribution assets [Member] | ||||||
Alliant Energy and IPL [Member] | Alliant Energy and IPL [Member] | Alliant Energy and WPL [Member] | Alliant Energy and WPL [Member] | MW | Alliant Energy and IPL [Member] | Scenario, Forecast [Member] | |||||||||||
IPL [Member] | |||||||||||||||||
Property, Plant and Equipment [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Electric plant | $10,016.30 | ' | $10,016.30 | ' | $9,415.70 | $5,252.60 | ' | $5,252.60 | ' | $5,034.90 | $59 | $151 | $272 | $67 | ' | $120 | ' |
Allowance for funds used during construction | 8.3 | 8.5 | 25.8 | 21.1 | ' | 6.6 | 5.8 | 18.6 | 14.3 | ' | 4 | 18 | 15 | 2 | ' | 2 | ' |
Fossil-fueled EGU capacity (in megawatts) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 650 | ' | ' |
Expected proceeds from asset sales | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $10 |
Receivables_Narrative_Details
Receivables (Narrative) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 |
In Millions, unless otherwise specified | IPL [Member] | IPL [Member] | Whiting Petroleum Corporation [Member] |
Receivables [Line Items] | ' | ' | ' |
Receivables sold | $203.70 | $238 | ' |
Final payment of certain future tax benefits expected to be realized | ' | ' | $26 |
Receivables_Maximum_And_Averag
Receivables (Maximum And Average Outstanding Cash Proceeds) (Details) (IPL [Member], USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Receivables [Line Items] | ' | ' | ' | ' |
Costs incurred | $0.20 | $0.30 | $0.60 | $1 |
Maximum [Member] | ' | ' | ' | ' |
Receivables [Line Items] | ' | ' | ' | ' |
Outstanding aggregate cash proceeds (based on daily outstanding balances) | 92 | 155 | 92 | 170 |
Average [Member] | ' | ' | ' | ' |
Receivables [Line Items] | ' | ' | ' | ' |
Outstanding aggregate cash proceeds (based on daily outstanding balances) | $54.50 | $132.70 | $38.90 | $132.50 |
Receivables_Receivables_Sold_U
Receivables (Receivables Sold Under The Agreement) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 | ||
In Millions, unless otherwise specified | ||||
Receivables [Line Items] | ' | ' | ||
Fair value of deferred proceeds | $160.30 | $203.50 | ||
IPL [Member] | ' | ' | ||
Receivables [Line Items] | ' | ' | ||
Customer accounts receivable | 142.6 | 151.6 | ||
Unbilled utility revenues | 60.7 | 86.2 | ||
Other receivables | 0.4 | 0.2 | ||
Receivables sold | 203.7 | 238 | ||
Less: cash proceeds | 38 | [1] | 29 | [1] |
Deferred proceeds | 165.7 | 209 | ||
Less: allowance for doubtful accounts | 5.4 | 5.5 | ||
Fair value of deferred proceeds | 160.3 | 203.5 | ||
Outstanding receivables past due | $17.80 | $21.50 | ||
[1] | Changes in cash proceeds are presented in bAccounts receivableb in operating activities in Alliant Energybs and IPLbs cash flows statements. |
Receivables_Additional_Attribu
Receivables (Additional Attributes Of Receivables Sold Under The Agreement) (Details) (IPL [Member], USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
IPL [Member] | ' | ' | ' | ' |
Receivables [Line Items] | ' | ' | ' | ' |
Collections reinvested in receivables | $520.10 | $481.10 | $1,537.30 | $1,407.40 |
Credit losses, net of recoveries | $6.40 | $3.90 | $12.80 | $7.80 |
Investments_Investments_Narrat
Investments Investments (Narrative) (Details) (WPL [Member], ATC [Member]) | Dec. 31, 2013 |
WPL [Member] | ATC [Member] | ' |
Schedule of Investments [Line Items] | ' |
Ownership interest percentage | 16.00% |
Investments_Unconsolidated_Equ
Investments (Unconsolidated Equity Investments) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Schedule of Investments [Line Items] | ' | ' | ' | ' |
Equity (income) loss from unconsolidated investments, net | ($11.50) | ($11.10) | ($34.20) | ($32.70) |
WPL [Member] | ' | ' | ' | ' |
Schedule of Investments [Line Items] | ' | ' | ' | ' |
Equity (income) loss from unconsolidated investments, net | -11.4 | -11.1 | -34.2 | -32.7 |
ATC [Member] | ' | ' | ' | ' |
Schedule of Investments [Line Items] | ' | ' | ' | ' |
Equity (income) loss from unconsolidated investments, net | -11.2 | -10.8 | -33.5 | -31.7 |
ATC [Member] | WPL [Member] | ' | ' | ' | ' |
Schedule of Investments [Line Items] | ' | ' | ' | ' |
Equity (income) loss from unconsolidated investments, net | -11.2 | -10.8 | -33.5 | -31.7 |
Other [Member] | ' | ' | ' | ' |
Schedule of Investments [Line Items] | ' | ' | ' | ' |
Equity (income) loss from unconsolidated investments, net | -0.3 | -0.3 | -0.7 | -1 |
Other [Member] | WPL [Member] | ' | ' | ' | ' |
Schedule of Investments [Line Items] | ' | ' | ' | ' |
Equity (income) loss from unconsolidated investments, net | ($0.20) | ($0.30) | ($0.70) | ($1) |
Common_Equity_Narrative_Detail
Common Equity (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | |
Common Equity [Line Items] | ' | ' | ' | ' |
Other comprehensive income | $0 | $0 | $0 | $0 |
IPL [Member] | ' | ' | ' | ' |
Common Equity [Line Items] | ' | ' | ' | ' |
Retained earnings free of dividend restrictions | 553,000,000 | ' | 553,000,000 | ' |
Restricted net assets of subsidiaries | 1,300,000,000 | ' | 1,300,000,000 | ' |
Capital contributions from parent | ' | ' | 90,000,000 | 90,000,000 |
Common stock dividends to parent | ' | ' | 105,000,000 | ' |
Other comprehensive income | 0 | 0 | 0 | 0 |
WPL [Member] | ' | ' | ' | ' |
Common Equity [Line Items] | ' | ' | ' | ' |
Retained earnings free of dividend restrictions | 30,000,000 | ' | 30,000,000 | ' |
Restricted net assets of subsidiaries | 1,700,000,000 | ' | 1,700,000,000 | ' |
Common stock dividends to parent | ' | ' | 89,100,000 | ' |
Other comprehensive income | $0 | $0 | $0 | $0 |
Common_Equity_Common_Share_Act
Common Equity (Common Share Activity) (Details) | 9 Months Ended |
Sep. 30, 2014 | |
Common Stock Oustanding [Roll Forward] | ' |
Shares outstanding, January 1, 2014 (in shares) | 110,943,669 |
Equity-based compensation plans (in shares) | 35,547 |
Other (in shares) | -43,536 |
Shares outstanding, September 30, 2014 (in shares) | 110,935,680 |
Redeemable_Preferred_Stock_Nar
Redeemable Preferred Stock Narrative (Details) (USD $) | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | ||
In Millions, except Share data, unless otherwise specified | Sep. 30, 2014 | Mar. 31, 2013 | Sep. 30, 2013 | Mar. 31, 2013 | Mar. 31, 2013 | Mar. 31, 2013 | Sep. 30, 2013 |
IPL [Member] | IPL [Member] | Alliant Energy and IPL [Member] | WPL [Member] | WPL [Member] | WPL [Member] | Alliant Energy and WPL [Member] | |
Redeemable Preferred Stock [Member] | Redeemable Preferred Stock [Member] | Redeemable Preferred Stock [Member] | Redeemable Preferred Stock [Member] | Redeemable Preferred Stock [Member] | Redeemable Preferred Stock [Member] | ||
8.375% [Member] | 4.40% through 6.50% [Member] | 4.40% [Member] | 6.50% [Member] | 4.40% through 6.50% [Member] | |||
Redeemable Preferred Stock [Line Items] | ' | ' | ' | ' | ' | ' | ' |
Preferred stock redeemed during period (in shares) | ' | 6,000,000 | ' | 1,049,225 | ' | ' | ' |
Preferred stock series | 5.10% | 8.38% | ' | ' | 4.40% | 6.50% | ' |
Preferred stock redeemed during period, value | ' | $150 | ' | $61 | ' | ' | ' |
Preferred stock redemption charge | ' | ' | $5 | ' | ' | ' | $1 |
Debt_Narrative_Details
Debt (Narrative) (Details) (USD $) | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | |||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Jul. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Oct. 31, 2014 | Oct. 31, 2014 |
IPL [Member] | IPL [Member] | IPL [Member] | Subsequent Event [Member] | Subsequent Event [Member] | |||
WPL [Member] | |||||||
Debt [Line Items] | ' | ' | ' | ' | ' | ' | ' |
Retirement of long-term debt | $47.70 | $0.80 | $38.40 | $38.40 | $0 | $250 | ' |
Interest rate | ' | ' | 5.00% | ' | ' | 4.00% | 4.10% |
Proceeds from issuance of long-term debt | ' | ' | ' | ' | ' | $250 | $250 |
Interest rate, variable | ' | ' | ' | ' | ' | 0.75% | ' |
Debt_Credit_Facilities_Details
Debt (Credit Facilities) (Details) (USD $) | 9 Months Ended | |
In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 |
Commercial paper: | ' | ' |
Amount outstanding | $353.80 | $279.40 |
Weighted average remaining maturity (in days) | '3 days | ' |
Weighted average interest rates | 0.20% | ' |
Available credit facility capacity | 646.2 | ' |
Parent Company [Member] | ' | ' |
Commercial paper: | ' | ' |
Amount outstanding | 169.1 | ' |
Weighted average remaining maturity (in days) | '3 days | ' |
Weighted average interest rates | 0.30% | ' |
Available credit facility capacity | 130.9 | ' |
IPL [Member] | ' | ' |
Commercial paper: | ' | ' |
Amount outstanding | 38 | 0 |
Weighted average remaining maturity (in days) | '1 day | ' |
Weighted average interest rates | 0.30% | ' |
Available credit facility capacity | 262 | ' |
WPL [Member] | ' | ' |
Commercial paper: | ' | ' |
Amount outstanding | 146.7 | 183.7 |
Weighted average remaining maturity (in days) | '3 days | ' |
Weighted average interest rates | 0.10% | ' |
Available credit facility capacity | $253.30 | ' |
Debt_Other_ShortTerm_Borrowing
Debt (Other Short-Term Borrowings) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Debt [Line Items] | ' | ' | ' | ' |
Maximum amount outstanding (based on daily outstanding balances) | $353.80 | $284.10 | $353.80 | $284.10 |
Average amount outstanding (based on daily outstanding balances) | 307.1 | 228.8 | 281.9 | 197.2 |
Weighted average interest rates | 0.20% | 0.20% | 0.20% | 0.20% |
IPL [Member] | ' | ' | ' | ' |
Debt [Line Items] | ' | ' | ' | ' |
Maximum amount outstanding (based on daily outstanding balances) | 38 | 0 | 38 | 26.3 |
Average amount outstanding (based on daily outstanding balances) | 0.4 | 0 | 0.3 | 1.7 |
Weighted average interest rates | 0.30% | ' | 0.20% | 0.40% |
WPL [Member] | ' | ' | ' | ' |
Debt [Line Items] | ' | ' | ' | ' |
Maximum amount outstanding (based on daily outstanding balances) | 185 | 165.4 | 204.7 | 165.4 |
Average amount outstanding (based on daily outstanding balances) | $157.90 | $140.90 | $157.50 | $113.40 |
Weighted average interest rates | 0.10% | 0.20% | 0.10% | 0.20% |
Income_Taxes_Narrative_Details
Income Taxes (Narrative) (Details) (USD $) | 9 Months Ended |
In Millions, unless otherwise specified | Sep. 30, 2014 |
Income Taxes [Line Items] | ' |
Increase (decrease) non-current deferred tax liabilities | $177.60 |
IPL [Member] | ' |
Income Taxes [Line Items] | ' |
Increase (decrease) non-current deferred tax liabilities | 123.6 |
WPL [Member] | ' |
Income Taxes [Line Items] | ' |
Increase (decrease) non-current deferred tax liabilities | $54.60 |
Income_Taxes_Schedule_Of_Effec
Income Taxes (Schedule Of Effective Income Tax Rates) (Details) | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | |
Effective Tax Rate [Line Items] | ' | ' | ' | ' |
Statutory federal income tax rate | 35.00% | 35.00% | 35.00% | 35.00% |
IPL's tax benefit riders | -13.00% | -12.90% | -12.40% | -12.60% |
Effect of rate-making on property-related differences | -8.60% | -6.20% | -6.70% | -5.90% |
Production tax credits | -6.80% | -7.70% | -6.60% | -7.70% |
Other items, net | 0.70% | 1.60% | 2.90% | 2.60% |
Overall income tax rate | 7.30% | 9.80% | 12.20% | 11.40% |
IPL [Member] | ' | ' | ' | ' |
Effective Tax Rate [Line Items] | ' | ' | ' | ' |
Statutory federal income tax rate | 35.00% | 35.00% | 35.00% | 35.00% |
IPL's tax benefit riders | -39.20% | -38.90% | -36.50% | -37.80% |
Effect of rate-making on property-related differences | -22.40% | -16.50% | -18.40% | -16.10% |
Production tax credits | -9.30% | -10.60% | -8.80% | -10.40% |
Other items, net | 2.20% | 0.40% | 3.20% | 0.80% |
Overall income tax rate | -33.70% | -30.60% | -25.50% | -28.50% |
WPL [Member] | ' | ' | ' | ' |
Effective Tax Rate [Line Items] | ' | ' | ' | ' |
Statutory federal income tax rate | 35.00% | 35.00% | 35.00% | 35.00% |
Effect of rate-making on property-related differences | -0.80% | -1.40% | -0.70% | -0.80% |
Production tax credits | -6.20% | -6.60% | -6.20% | -6.90% |
Other items, net | 0.00% | 3.70% | 3.00% | 4.40% |
Overall income tax rate | 28.00% | 30.70% | 31.10% | 31.70% |
Income_Taxes_Production_Tax_Cr
Income Taxes (Production Tax Credits (Net Of State Tax Impacts)) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Production Tax Credits [Line Items] | ' | ' | ' | ' |
Production Tax Credits | $4.60 | $5.10 | $22 | $22.40 |
WPL [Member] | ' | ' | ' | ' |
Production Tax Credits [Line Items] | ' | ' | ' | ' |
Production Tax Credits | 2.6 | 2.8 | 12.2 | 12.1 |
Cedar Ridge Wind Project [Member] | WPL [Member] | ' | ' | ' | ' |
Production Tax Credits [Line Items] | ' | ' | ' | ' |
Nameplate Capacity (in megawatts) | ' | ' | 68 | ' |
Production Tax Credits | 0.6 | 0.6 | 2.8 | 2.9 |
Bent Tree - Phase I Wind Project [Member] | WPL [Member] | ' | ' | ' | ' |
Production Tax Credits [Line Items] | ' | ' | ' | ' |
Nameplate Capacity (in megawatts) | ' | ' | 201 | ' |
Production Tax Credits | 2 | 2.2 | 9.4 | 9.2 |
Whispering Willow - East Wind Project [Member] | IPL [Member] | ' | ' | ' | ' |
Production Tax Credits [Line Items] | ' | ' | ' | ' |
Nameplate Capacity (in megawatts) | ' | ' | 200 | ' |
Production Tax Credits | $2 | $2.30 | $9.80 | $10.30 |
Income_Taxes_Summary_Of_Tax_Cr
Income Taxes (Summary Of Tax Credit Carryforwards) (Details) (USD $) | Sep. 30, 2014 |
In Millions, unless otherwise specified | |
Carryforwards [Line Items] | ' |
Net operating losses, deferred tax assets | $471 |
IPL [Member] | ' |
Carryforwards [Line Items] | ' |
Net operating losses, deferred tax assets | 180 |
WPL [Member] | ' |
Carryforwards [Line Items] | ' |
Net operating losses, deferred tax assets | 180 |
Federal [Member] | ' |
Carryforwards [Line Items] | ' |
Net operating losses, carryforward amount | 710 |
Net operating losses, deferred tax assets | 244 |
Tax credits, carryforward amount | 193 |
Tax credits, deferred tax assets | 190 |
Federal [Member] | IPL [Member] | ' |
Carryforwards [Line Items] | ' |
Net operating losses, carryforward amount | 310 |
Net operating losses, deferred tax assets | 106 |
Tax credits, carryforward amount | 64 |
Tax credits, deferred tax assets | 63 |
Federal [Member] | WPL [Member] | ' |
Carryforwards [Line Items] | ' |
Net operating losses, carryforward amount | 305 |
Net operating losses, deferred tax assets | 105 |
Tax credits, carryforward amount | 71 |
Tax credits, deferred tax assets | 69 |
State [Member] | ' |
Carryforwards [Line Items] | ' |
Net operating losses, carryforward amount | 744 |
Net operating losses, deferred tax assets | 37 |
State [Member] | IPL [Member] | ' |
Carryforwards [Line Items] | ' |
Net operating losses, carryforward amount | 217 |
Net operating losses, deferred tax assets | 11 |
State [Member] | WPL [Member] | ' |
Carryforwards [Line Items] | ' |
Net operating losses, carryforward amount | 116 |
Net operating losses, deferred tax assets | $6 |
Benefit_Plans_Narrative_Detail
Benefit Plans (Narrative) (Details) (USD $) | 9 Months Ended |
In Millions, unless otherwise specified | Sep. 30, 2014 |
Defined Benefit Plan Disclosure [Line Items] | ' |
Unrecognized compensation cost | 7 |
Minimum [Member] | ' |
Defined Benefit Plan Disclosure [Line Items] | ' |
Unrecognized compensation cost recognized over a weighted average period | '1 year |
Maximum [Member] | ' |
Defined Benefit Plan Disclosure [Line Items] | ' |
Unrecognized compensation cost recognized over a weighted average period | '2 years |
Benefit_Plans_Defined_Benefit_
Benefit Plans (Defined Benefit Pension And Other Postretirement Benefits Plans) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Defined benefit pension plans [Member] | ' | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' |
Service cost | $3.30 | $3.90 | $9.90 | $11.80 |
Interest cost | 13.6 | 12.3 | 40.6 | 36.8 |
Expected return on plan assets | -18.8 | -18.5 | -56.3 | -55.5 |
Amortization of prior service cost (credit) | 0 | 0.1 | 0 | 0.2 |
Amortization of actuarial loss | 4.8 | 9 | 14.6 | 27.1 |
Total | 2.9 | 6.8 | 8.8 | 20.4 |
OPEB Plans [Member] | ' | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' |
Service cost | 1.3 | 1.5 | 3.9 | 4.7 |
Interest cost | 2.4 | 2.1 | 7.1 | 6.3 |
Expected return on plan assets | -2.1 | -2 | -6.2 | -6 |
Amortization of prior service cost (credit) | -3 | -3 | -8.9 | -8.9 |
Amortization of actuarial loss | 0.6 | 1.3 | 1.8 | 3.7 |
Total | -0.8 | -0.1 | -2.3 | -0.2 |
IPL [Member] | Defined benefit pension plans [Member] | ' | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' |
Service cost | 1.8 | 2.2 | 5.4 | 6.5 |
Interest cost | 6.2 | 5.7 | 18.8 | 17.1 |
Expected return on plan assets | -8.9 | -8.8 | -26.8 | -26.4 |
Amortization of prior service cost (credit) | 0 | 0 | 0 | 0.1 |
Amortization of actuarial loss | 2 | 3.8 | 6 | 11.4 |
Total | 1.1 | 2.9 | 3.4 | 8.7 |
IPL [Member] | OPEB Plans [Member] | ' | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' |
Service cost | 0.6 | 0.8 | 1.8 | 2.2 |
Interest cost | 1 | 0.9 | 3 | 2.7 |
Expected return on plan assets | -1.5 | -1.4 | -4.4 | -4.2 |
Amortization of prior service cost (credit) | -1.6 | -1.6 | -4.7 | -4.7 |
Amortization of actuarial loss | 0.3 | 0.6 | 0.8 | 2 |
Total | -1.2 | -0.7 | -3.5 | -2 |
WPL [Member] | Defined benefit pension plans [Member] | ' | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' |
Service cost | 1.3 | 1.5 | 3.7 | 4.4 |
Interest cost | 5.7 | 5.2 | 17 | 15.5 |
Expected return on plan assets | -8.1 | -8 | -24.3 | -23.9 |
Amortization of prior service cost (credit) | 0 | 0.1 | 0.2 | 0.3 |
Amortization of actuarial loss | 2.3 | 4.2 | 6.9 | 12.8 |
Total | 1.2 | 3 | 3.5 | 9.1 |
WPL [Member] | OPEB Plans [Member] | ' | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' |
Service cost | 0.5 | 0.6 | 1.5 | 1.8 |
Interest cost | 1 | 0.8 | 2.9 | 2.5 |
Expected return on plan assets | -0.4 | -0.4 | -1 | -1 |
Amortization of prior service cost (credit) | -1 | -0.9 | -2.9 | -2.9 |
Amortization of actuarial loss | 0.3 | 0.5 | 0.9 | 1.5 |
Total | $0.40 | $0.60 | $1.40 | $1.90 |
Benefit_Plans_Schedule_Of_Qual
Benefit Plans (Schedule Of Qualified and Non-qualified Pension And Other Postretirement Benefits Costs (Credits)) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Pension Benefits Costs [Member] | IPL [Member] | ' | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' |
Benefits costs (credits) associated with Corporate Services employees | $0.40 | $0.40 | $1.10 | $1.40 |
Pension Benefits Costs [Member] | WPL [Member] | ' | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' |
Benefits costs (credits) associated with Corporate Services employees | 0.3 | 0.4 | 0.8 | 1.1 |
OPEB Costs (Credits) [Member] | IPL [Member] | ' | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' |
Benefits costs (credits) associated with Corporate Services employees | 0 | -0.1 | -0.2 | -0.2 |
OPEB Costs (Credits) [Member] | WPL [Member] | ' | ' | ' | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' |
Benefits costs (credits) associated with Corporate Services employees | ($0.10) | ($0.10) | ($0.20) | ($0.20) |
Benefit_Plans_Employees_Partic
Benefit Plans (Employees Participate In Defined Contribution Retirement Plans) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||||||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | ||||
401(k) costs | $5.30 | $4.70 | $17.30 | $14.70 | ||||
IPL [Member] | ' | ' | ' | ' | ||||
401(k) costs | 2.7 | [1] | 2.4 | [1] | 8.4 | [1] | 7.6 | [1] |
WPL [Member] | ' | ' | ' | ' | ||||
401(k) costs | $2.40 | [1] | $2.10 | [1] | $8.30 | [1] | $6.50 | [1] |
[1] | IPLbs and WPLbs amounts include allocated costs associated with Corporate Services employees. |
Benefit_Plans_Recognized_Compe
Benefit Plans (Recognized Compensation Expense And Income Tax Benefits) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Compensation expense | $1.20 | $4 | $7.40 | $8.60 |
Income tax benefits | 0.5 | 1.6 | 3 | 3.5 |
IPL [Member] | ' | ' | ' | ' |
Compensation expense | 0.6 | 2 | 4 | 4.4 |
Income tax benefits | 0.2 | 0.8 | 1.6 | 1.8 |
WPL [Member] | ' | ' | ' | ' |
Compensation expense | 0.5 | 1.7 | 3.1 | 3.7 |
Income tax benefits | $0.30 | $0.70 | $1.30 | $1.50 |
Benefit_Plans_Summary_Of_Perfo
Benefit Plans (Summary Of Performance Shares Activity) (Details) (Performance Shares [Member], USD $) | 9 Months Ended | |
In Millions, except Share data, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' |
Nonvested, January 1 (in shares/awards) | 139,940 | 145,277 |
Granted (in shares/awards) | 51,221 | 49,093 |
Vested (in shares/awards) | -45,235 | -54,430 |
Forfeited (in shares/awards) | -1,502 | 0 |
Nonvested, September 30 (in shares/awards) | 144,424 | 139,940 |
2011 Grant [Member] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' |
Vested (in shares/awards) | -45,235 | ' |
Vested percentage of the target | 147.50% | ' |
Aggregate payout value | 3.4 | ' |
Payout - cash | 2.9 | ' |
Payout - common stock shares issued (in shares) | 4,810 | ' |
2010 Grant [Member] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' |
Vested (in shares/awards) | ' | -54,430 |
Vested percentage of the target | ' | 197.50% |
Aggregate payout value | ' | 4.8 |
Payout - cash | ' | 4.4 |
Payout - common stock shares issued (in shares) | ' | 4,177 |
Benefit_Plans_Summary_Of_Perfo1
Benefit Plans (Summary Of Performance Unit Activity) (Details) (Performance Units [Member], USD $) | 9 Months Ended | |
In Millions, except Share data, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' |
Nonvested, January 1 (in shares/awards) | 65,912 | 64,969 |
Granted (in shares/awards) | 20,422 | 22,201 |
Vested (in shares/awards) | -20,751 | -19,760 |
Forfeited (in shares/awards) | -958 | -1,498 |
Nonvested, September 30 (in shares/awards) | 64,625 | 65,912 |
2011 Grant [Member] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' |
Vested (in shares/awards) | -20,751 | ' |
Vested percentage of the target | 147.50% | ' |
Aggregate payout value | 1.2 | ' |
2010 Grant [Member] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' |
Vested (in shares/awards) | ' | -19,760 |
Vested percentage of the target | ' | 197.50% |
Aggregate payout value | ' | 1.3 |
Benefit_Plans_Fair_Values_Of_N
Benefit Plans (Fair Values Of Nonvested Performance Shares And Units) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 |
Performance Shares [Member] | Performance Shares [Member] | Performance Shares [Member] | Performance Shares [Member] | Performance Units [Member] | Performance Units [Member] | Performance Units [Member] | Performance Units [Member] | 2014 Grant [Member] | 2014 Grant [Member] | 2013 Grant [Member] | 2013 Grant [Member] | 2012 Grant [Member] | 2012 Grant [Member] | |
Performance Shares [Member] | Performance Units [Member] | Performance Shares [Member] | Performance Units [Member] | Performance Shares [Member] | Performance Units [Member] | |||||||||
Defined Benefit Plan Disclosure [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Nonvested awards (in shares/awards) | 144,424 | 139,940 | 139,940 | 145,277 | 64,625 | 65,912 | 65,912 | 64,969 | 49,719 | 19,775 | 49,093 | 21,726 | 45,612 | 23,124 |
Alliant Energy common stock closing price on September 30, 2014 (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | $55.41 | ' | $55.41 | ' | $55.41 | ' |
Alliant Energy common stock closing price on grant date (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | ' | $53.77 | ' | $47.58 | ' | $43.05 |
Estimated payout percentage based on performance criteria | ' | ' | ' | ' | ' | ' | ' | ' | 94.00% | 94.00% | 117.00% | 117.00% | 126.00% | 126.00% |
Fair values of each nonvested award (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | $52.09 | $50.54 | $64.83 | $55.67 | $69.82 | $54.24 |
Benefit_Plans_Summary_Of_Restr
Benefit Plans (Summary Of Restricted Stock Activity) (Details) (Performance Contingent Restricted Stock [Member], USD $) | 9 Months Ended | |||
Sep. 30, 2014 | Sep. 30, 2013 | |||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' | ||
Nonvested, January 1 (in shares/awards) | 158,922 | 211,651 | ||
Nonvested shares, January 1, weighted average fair value (in dollars per share) | $42.71 | $32.42 | ||
Granted (in shares/awards) | 51,221 | 49,093 | ||
Granted, weighted average fair value (in dollars per share) | $53.77 | $47.58 | ||
Vested (in shares/awards) | -90,847 | [1] | 0 | [1] |
Vested, weighted average fair value (in dollars per share) | $40.91 | [1] | $0 | [1] |
Forfeited (in shares/awards) | -20,484 | [2] | -101,822 | [2] |
Forfeited, weighted average fair value (in dollars per share) | $39.85 | [2] | $23.67 | [2] |
Nonvested, September 30 (in shares/awards) | 98,812 | 158,922 | ||
Nonvested shares, September 30, weighted average fair value (in dollars per share) | $50.69 | $42.71 | ||
2012 Grant [Member] | ' | ' | ||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' | ||
Vested (in shares/awards) | -45,612 | [1] | ' | |
2011 Grant [Member] | ' | ' | ||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' | ||
Vested (in shares/awards) | -45,235 | [1] | ' | |
2009 Grant [Member] | ' | ' | ||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' | ||
Forfeited (in shares/awards) | ' | -101,822 | [2] | |
[1] | In 2014, 45,612 and 45,235 performance contingent restricted shares granted in 2012 and 2011, respectively, vested because the specified performance criteria for such shares were met. | |||
[2] | In 2013, 101,822 performance contingent restricted shares granted in 2009 were forfeited because the specified performance criteria for such shares were not met. |
Benefit_Plans_Summary_Of_Perfo2
Benefit Plans (Summary Of Performance Contingent Cash Awards Activity) (Details) (Performance Contingent Cash Awards [Member], USD $) | 9 Months Ended | |||
In Millions, except Share data, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | ||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' | ||
Nonvested, January 1 (in shares/awards) | 96,977 | 59,639 | ||
Granted (in shares/awards) | 42,446 | 39,530 | ||
Vested (in shares/awards) | -55,517 | [1] | 0 | [1] |
Forfeited (in shares/awards) | -4,295 | -1,413 | ||
Nonvested, September 30 (in shares/awards) | 79,611 | 97,756 | ||
2012 Grant [Member] | ' | ' | ||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' | ||
Vested (in shares/awards) | -34,766 | [1] | ' | |
Cash payout value | 1.9 | [1] | ' | |
2011 Grant [Member] | ' | ' | ||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | ' | ' | ||
Vested (in shares/awards) | -20,751 | [1] | ' | |
Cash payout value | 1.1 | [1] | ' | |
[1] | In 2014, 34,766 and 20,751 performance contingent cash awards granted in 2012 and 2011 vested, resulting in cash payouts valued at $1.9 million and $1.1 million, respectively. |
Asset_Retirement_Obligations_R
Asset Retirement Obligations (Reconciliation Of Changes In Asset Retirement Obligations) (Details) (USD $) | 9 Months Ended | |||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | ||
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ' | ' | ||
Balance, January 1 | $109.70 | $101.50 | ||
Revisions in estimated cash flows | 0 | 3.4 | ||
Liabilities settled | -1 | -0.9 | ||
Liabilities incurred | 16.5 | [1] | 0 | [1] |
Accretion expense | 3.3 | 2.8 | ||
Balance, September 30 | 128.5 | 106.8 | ||
IPL [Member] | ' | ' | ||
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ' | ' | ||
Balance, January 1 | 47.9 | 45.5 | ||
Revisions in estimated cash flows | 0 | 0.8 | ||
Liabilities settled | -0.5 | -0.1 | ||
Liabilities incurred | 16.3 | [1] | 0 | [1] |
Accretion expense | 1.6 | 1.3 | ||
Balance, September 30 | 65.3 | 47.5 | ||
WPL [Member] | ' | ' | ||
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ' | ' | ||
Balance, January 1 | 52.4 | 46.9 | ||
Revisions in estimated cash flows | 0 | 2.6 | ||
Liabilities settled | -0.5 | -0.8 | ||
Liabilities incurred | 0.2 | [1] | 0 | [1] |
Accretion expense | 1.3 | 1.2 | ||
Balance, September 30 | 53.4 | 49.9 | ||
Sutherland [Member] | IPL [Member] | ' | ' | ||
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ' | ' | ||
Liabilities incurred | $12 | [1] | ' | |
[1] | In 2014, IPL recorded AROs of $12.0 million related to its Sutherland Generating Station. |
Fair_Value_Measurements_Narrat
Fair Value Measurements (Narrative) (Details) (IPL [Member]) | 9 Months Ended |
Sep. 30, 2014 | |
IPL [Member] | ' |
Cumulative preferred stock rate | 5.10% |
Fair_Value_Measurements_Fair_V
Fair Value Measurements (Fair Value Of Financial Instruments) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified | ||
Assets: | ' | ' |
Derivative assets | $83.10 | $26.70 |
Deferred proceeds (sales of receivables) | 160.3 | 203.5 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 3,852.60 | 3,712.30 |
Cumulative preferred stock | 200 | 200 |
Cumulative preferred stock | 200.2 | 167 |
Derivative liabilities | 14.1 | 20.8 |
IPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 44.7 | 21.1 |
Deferred proceeds (sales of receivables) | 160.3 | 203.5 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 1,778.20 | 1,726.40 |
Cumulative preferred stock | 200 | 200 |
Cumulative preferred stock | 200.2 | 167 |
Derivative liabilities | 8.2 | 5.2 |
WPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 38.4 | 5.6 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 1,618 | 1,532.90 |
Derivative liabilities | 5.9 | 15.6 |
Carrying Amount [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 83.1 | 26.7 |
Deferred proceeds (sales of receivables) | 160.3 | 203.5 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 3,292.30 | 3,336.30 |
Cumulative preferred stock | 200 | 200 |
Derivative liabilities | 14.1 | 20.8 |
Carrying Amount [Member] | IPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 44.7 | 21.1 |
Deferred proceeds (sales of receivables) | 160.3 | 203.5 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 1,520.30 | 1,558.40 |
Cumulative preferred stock | 200 | 200 |
Derivative liabilities | 8.2 | 5.2 |
Carrying Amount [Member] | WPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 38.4 | 5.6 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 1,324 | 1,332.10 |
Derivative liabilities | 5.9 | 15.6 |
Fair Value [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 83.1 | 26.7 |
Deferred proceeds (sales of receivables) | 160.3 | 203.5 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 3,852.60 | 3,712.30 |
Cumulative preferred stock | 200.2 | 167 |
Derivative liabilities | 14.1 | 20.8 |
Fair Value [Member] | IPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 44.7 | 21.1 |
Deferred proceeds (sales of receivables) | 160.3 | 203.5 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 1,778.20 | 1,726.40 |
Cumulative preferred stock | 200.2 | 167 |
Derivative liabilities | 8.2 | 5.2 |
Fair Value [Member] | WPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 38.4 | 5.6 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 1,618 | 1,532.90 |
Derivative liabilities | $5.90 | $15.60 |
Fair_Value_Measurements_Fair_V1
Fair Value Measurements (Fair Value Measurements) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified | ||
Assets: | ' | ' |
Derivative assets | $72.20 | $23.50 |
Deferred proceeds | 160.3 | 203.5 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 3,852.60 | 3,712.30 |
Cumulative preferred stock | 200.2 | 167 |
Derivative liabilities | 7.9 | 17.6 |
IPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 39.8 | 19.5 |
Deferred proceeds | 160.3 | 203.5 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 1,778.20 | 1,726.40 |
Cumulative preferred stock | 200.2 | 167 |
Derivative liabilities | 3.6 | 3.6 |
WPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 32.4 | 4 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 1,618 | 1,532.90 |
Derivative liabilities | 4.3 | 14 |
Commodity Contracts [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 83.1 | 26.7 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 14.1 | 20.8 |
Commodity Contracts [Member] | IPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 44.7 | 21.1 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 8.2 | 5.2 |
Commodity Contracts [Member] | WPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 38.4 | 5.6 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 5.9 | 15.6 |
Level 1 [Member] | ' | ' |
Assets: | ' | ' |
Deferred proceeds | 0 | 0 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 0 | 0 |
Cumulative preferred stock | 200.2 | 167 |
Level 1 [Member] | IPL [Member] | ' | ' |
Assets: | ' | ' |
Deferred proceeds | 0 | 0 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 0 | 0 |
Cumulative preferred stock | 200.2 | 167 |
Level 1 [Member] | WPL [Member] | ' | ' |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 0 | 0 |
Level 1 [Member] | Commodity Contracts [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 0 | 0 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 0 | 0 |
Level 1 [Member] | Commodity Contracts [Member] | IPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 0 | 0 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 0 | 0 |
Level 1 [Member] | Commodity Contracts [Member] | WPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 0 | 0 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 0 | 0 |
Level 2 [Member] | ' | ' |
Assets: | ' | ' |
Deferred proceeds | 0 | 0 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 3,849.30 | 3,711.80 |
Cumulative preferred stock | 0 | 0 |
Level 2 [Member] | IPL [Member] | ' | ' |
Assets: | ' | ' |
Deferred proceeds | 0 | 0 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 1,778.20 | 1,726.40 |
Cumulative preferred stock | 0 | 0 |
Level 2 [Member] | WPL [Member] | ' | ' |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 1,618 | 1,532.90 |
Level 2 [Member] | Commodity Contracts [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 6.3 | 4.7 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 5.6 | 3.2 |
Level 2 [Member] | Commodity Contracts [Member] | IPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 4.3 | 3 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 4.3 | 1.7 |
Level 2 [Member] | Commodity Contracts [Member] | WPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 2 | 1.7 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 1.3 | 1.5 |
Level 3 [Member] | ' | ' |
Assets: | ' | ' |
Deferred proceeds | 160.3 | 203.5 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 3.3 | 0.5 |
Cumulative preferred stock | 0 | 0 |
Level 3 [Member] | IPL [Member] | ' | ' |
Assets: | ' | ' |
Deferred proceeds | 160.3 | 203.5 |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 0 | 0 |
Cumulative preferred stock | 0 | 0 |
Level 3 [Member] | WPL [Member] | ' | ' |
Capitalization and liabilities: | ' | ' |
Long-term debt (including current maturities) | 0 | 0 |
Level 3 [Member] | Commodity Contracts [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 76.8 | 22 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 8.5 | 17.6 |
Level 3 [Member] | Commodity Contracts [Member] | IPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 40.4 | 18.1 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | 3.9 | 3.5 |
Level 3 [Member] | Commodity Contracts [Member] | WPL [Member] | ' | ' |
Assets: | ' | ' |
Derivative assets | 36.4 | 3.9 |
Capitalization and liabilities: | ' | ' |
Derivative liabilities | $4.60 | $14.10 |
Fair_Value_Measurements_Fair_V2
Fair Value Measurements (Fair Value Measurements Using Significant Unobservable Inputs) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||||||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | ||||
Commodity Contracts [Member] | ' | ' | ' | ' | ||||
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ' | ' | ' | ' | ||||
Beginning balance | $101.20 | $42.50 | $4.40 | $11.90 | ||||
Total net gains (losses) (realized/unrealized) included in changes in net assets | -12.7 | [1] | 0.1 | [1] | 43 | [1] | -8.3 | [1] |
Transfers into Level 3 | 0 | [2] | -9.9 | [2] | 0 | [2] | -0.4 | [2] |
Transfers out of Level 3 | ' | ' | 0 | [3] | -0.5 | [3] | ||
Purchases | ' | ' | 76.7 | 50.9 | ||||
Sales | -1.2 | 0 | -1.2 | 0 | ||||
Settlements | -19 | [4] | -15.5 | [4] | -54.6 | [4] | -36.4 | [4] |
Ending balance | 68.3 | 17.2 | 68.3 | 17.2 | ||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 | -10.3 | [1] | 0.1 | [1] | 34.6 | [1] | -8.3 | [1] |
Commodity Contracts [Member] | IPL [Member] | ' | ' | ' | ' | ||||
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ' | ' | ' | ' | ||||
Beginning balance | 64.2 | 40.6 | 14.6 | 12.5 | ||||
Total net gains (losses) (realized/unrealized) included in changes in net assets | -10.1 | [1] | 2 | [1] | -5.1 | [1] | 1.5 | [1] |
Transfers into Level 3 | 0 | [2] | -0.1 | [2] | ' | ' | ||
Transfers out of Level 3 | ' | ' | 0 | [3] | -1.5 | [3] | ||
Purchases | ' | ' | 68.8 | 46.1 | ||||
Sales | -1 | 0 | -1 | 0 | ||||
Settlements | -16.6 | [4] | -13.9 | [4] | -40.8 | [4] | -30 | [4] |
Ending balance | 36.5 | 28.6 | 36.5 | 28.6 | ||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 | -9.6 | [1] | 2 | [1] | -6 | [1] | 1.5 | [1] |
Commodity Contracts [Member] | WPL [Member] | ' | ' | ' | ' | ||||
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ' | ' | ' | ' | ||||
Beginning balance | 37 | 1.9 | -10.2 | -0.6 | ||||
Total net gains (losses) (realized/unrealized) included in changes in net assets | -2.6 | [1] | -1.9 | [1] | 48.1 | [1] | -9.8 | [1] |
Transfers into Level 3 | 0 | [2] | -9.8 | [2] | 0 | [2] | -0.4 | [2] |
Transfers out of Level 3 | ' | ' | 0 | [3] | 1 | [3] | ||
Purchases | ' | ' | 7.9 | 4.8 | ||||
Sales | -0.2 | 0 | -0.2 | 0 | ||||
Settlements | -2.4 | -1.6 | -13.8 | -6.4 | ||||
Ending balance | 31.8 | -11.4 | 31.8 | -11.4 | ||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 | -0.7 | [1] | -1.9 | [1] | 40.6 | [1] | -9.8 | [1] |
Deferred Proceeds [Member] | ' | ' | ' | ' | ||||
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ' | ' | ' | ' | ||||
Beginning balance | 193.7 | 69.3 | 203.5 | 66.8 | ||||
Total net gains (losses) (realized/unrealized) included in changes in net assets | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |
Transfers into Level 3 | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2] |
Transfers out of Level 3 | ' | ' | 0 | [3] | 0 | [3] | ||
Purchases | ' | ' | 0 | 0 | ||||
Sales | 0 | 0 | 0 | 0 | ||||
Settlements | -33.4 | [4] | 17.6 | [4] | -43.2 | [4] | 20.1 | [4] |
Ending balance | 160.3 | 86.9 | 160.3 | 86.9 | ||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |
Deferred Proceeds [Member] | IPL [Member] | ' | ' | ' | ' | ||||
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ' | ' | ' | ' | ||||
Beginning balance | 193.7 | 69.3 | 203.5 | 66.8 | ||||
Total net gains (losses) (realized/unrealized) included in changes in net assets | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |
Transfers into Level 3 | 0 | [2] | 0 | [2] | ' | ' | ||
Transfers out of Level 3 | ' | ' | 0 | [3] | 0 | [3] | ||
Purchases | ' | ' | 0 | 0 | ||||
Sales | 0 | 0 | 0 | 0 | ||||
Settlements | -33.4 | [4] | 17.6 | [4] | -43.2 | [4] | 20.1 | [4] |
Ending balance | 160.3 | 86.9 | 160.3 | 86.9 | ||||
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30 | $0 | [1] | $0 | [1] | $0 | [1] | $0 | [1] |
[1] | Unrealized gains and losses related to derivative assets and derivative liabilities are recorded in regulatory assets and regulatory liabilities on the balance sheets. | |||||||
[2] | Markets for similar assets and liabilities became inactive and observable market inputs became unavailable for transfers into Level 3. The transfers were valued as of the beginning of the period. | |||||||
[3] | Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period. | |||||||
[4] | Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold. |
Fair_Value_Measurements_Fair_V3
Fair Value Measurements Fair Value Measurements (Fair Value Of Net Derivative Assets (Liabilities)) (Details) (Commodity Contracts [Member], USD $) | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012 |
In Millions, unless otherwise specified | ||||||
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ' | ' | ' | ' | ' | ' |
Fair value, net derivative assets | $68.30 | $101.20 | $4.40 | $17.20 | $42.50 | $11.90 |
Excluding Financial Transmission Rights [Member] | ' | ' | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ' | ' | ' | ' | ' | ' |
Fair value, net derivative assets | 29.7 | ' | ' | ' | ' | ' |
Fair value, net derivative liabilities | ' | ' | -13.9 | ' | ' | ' |
Financial Transmission Rights [Member] | ' | ' | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ' | ' | ' | ' | ' | ' |
Fair value, net derivative assets | 38.6 | ' | 18.3 | ' | ' | ' |
IPL [Member] | ' | ' | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ' | ' | ' | ' | ' | ' |
Fair value, net derivative assets | 36.5 | 64.2 | 14.6 | 28.6 | 40.6 | 12.5 |
IPL [Member] | Excluding Financial Transmission Rights [Member] | ' | ' | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ' | ' | ' | ' | ' | ' |
Fair value, net derivative assets | 3.3 | ' | ' | ' | ' | ' |
Fair value, net derivative liabilities | ' | ' | -2.1 | ' | ' | ' |
IPL [Member] | Financial Transmission Rights [Member] | ' | ' | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ' | ' | ' | ' | ' | ' |
Fair value, net derivative assets | 33.2 | ' | 16.7 | ' | ' | ' |
WPL [Member] | ' | ' | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ' | ' | ' | ' | ' | ' |
Fair value, net derivative assets | 31.8 | 37 | -10.2 | -11.4 | 1.9 | -0.6 |
WPL [Member] | Excluding Financial Transmission Rights [Member] | ' | ' | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ' | ' | ' | ' | ' | ' |
Fair value, net derivative assets | 26.4 | ' | ' | ' | ' | ' |
Fair value, net derivative liabilities | ' | ' | -11.8 | ' | ' | ' |
WPL [Member] | Financial Transmission Rights [Member] | ' | ' | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ' | ' | ' | ' | ' | ' |
Fair value, net derivative assets | $5.40 | ' | $1.60 | ' | ' | ' |
Derivative_Instruments_Narrati
Derivative Instruments (Narrative) (Details) (USD $) | Sep. 30, 2014 |
In Millions, unless otherwise specified | |
Derivative Instruments [Line Items] | ' |
Cash collateral posted by counterparties | $4.70 |
IPL [Member] | ' |
Derivative Instruments [Line Items] | ' |
Cash collateral posted by counterparties | 0.3 |
WPL [Member] | ' |
Derivative Instruments [Line Items] | ' |
Cash collateral posted by counterparties | $4.40 |
Derivative_Instruments_Notiona
Derivative Instruments (Notional Amounts Of Derivative Instruments) (Details) (Commodity [Member]) | Sep. 30, 2014 |
MWh | |
Electricity (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 10,219,000 |
Electricity (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 2,724,000 |
Electricity (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 7,495,000 |
FTRs (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 15,233,000 |
FTRs (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 8,898,000 |
FTRs (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 6,335,000 |
Natural Gas (Dths) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 71,361,000 |
Natural Gas (Dths) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 47,679,000 |
Natural Gas (Dths) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 23,682,000 |
Coal (Tons) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 6,411,000 |
Coal (Tons) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,832,000 |
Coal (Tons) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 4,579,000 |
2014 [Member] | Electricity (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 2,092,000 |
2014 [Member] | Electricity (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,046,000 |
2014 [Member] | Electricity (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,046,000 |
2014 [Member] | FTRs (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 5,673,000 |
2014 [Member] | FTRs (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 3,340,000 |
2014 [Member] | FTRs (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 2,333,000 |
2014 [Member] | Natural Gas (Dths) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 25,806,000 |
2014 [Member] | Natural Gas (Dths) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 17,823,000 |
2014 [Member] | Natural Gas (Dths) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 7,983,000 |
2014 [Member] | Coal (Tons) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 836,000 |
2014 [Member] | Coal (Tons) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 266,000 |
2014 [Member] | Coal (Tons) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 570,000 |
2015 [Member] | Electricity (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 3,946,000 |
2015 [Member] | Electricity (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,678,000 |
2015 [Member] | Electricity (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 2,268,000 |
2015 [Member] | FTRs (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 9,560,000 |
2015 [Member] | FTRs (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 5,558,000 |
2015 [Member] | FTRs (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 4,002,000 |
2015 [Member] | Natural Gas (Dths) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 36,532,000 |
2015 [Member] | Natural Gas (Dths) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 25,776,000 |
2015 [Member] | Natural Gas (Dths) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 10,756,000 |
2015 [Member] | Coal (Tons) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,490,000 |
2015 [Member] | Coal (Tons) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 75,000 |
2015 [Member] | Coal (Tons) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,415,000 |
2016 [Member] | Electricity (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,553,000 |
2016 [Member] | Electricity (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2016 [Member] | Electricity (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,553,000 |
2016 [Member] | FTRs (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2016 [Member] | FTRs (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2016 [Member] | FTRs (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2016 [Member] | Natural Gas (Dths) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 8,805,000 |
2016 [Member] | Natural Gas (Dths) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 3,862,000 |
2016 [Member] | Natural Gas (Dths) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 4,943,000 |
2016 [Member] | Coal (Tons) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,899,000 |
2016 [Member] | Coal (Tons) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 830,000 |
2016 [Member] | Coal (Tons) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,069,000 |
2017 [Member] | Electricity (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,314,000 |
2017 [Member] | Electricity (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2017 [Member] | Electricity (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,314,000 |
2017 [Member] | FTRs (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2017 [Member] | FTRs (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2017 [Member] | FTRs (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2017 [Member] | Natural Gas (Dths) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 218,000 |
2017 [Member] | Natural Gas (Dths) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 218,000 |
2017 [Member] | Natural Gas (Dths) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2017 [Member] | Coal (Tons) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,073,000 |
2017 [Member] | Coal (Tons) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 274,000 |
2017 [Member] | Coal (Tons) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 799,000 |
2018 [Member] | Electricity (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,314,000 |
2018 [Member] | Electricity (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2018 [Member] | Electricity (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,314,000 |
2018 [Member] | FTRs (MWhs) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2018 [Member] | FTRs (MWhs) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2018 [Member] | FTRs (MWhs) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2018 [Member] | Natural Gas (Dths) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2018 [Member] | Natural Gas (Dths) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2018 [Member] | Natural Gas (Dths) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 0 |
2018 [Member] | Coal (Tons) [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 1,113,000 |
2018 [Member] | Coal (Tons) [Member] | IPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 387,000 |
2018 [Member] | Coal (Tons) [Member] | WPL [Member] | ' |
Notional Amount of Derivatives [Line Items] | ' |
Notional unit amount of derivatives (in MWhs/Dths/Tons) | 726,000 |
Derivative_Instruments_Fair_Va
Derivative Instruments (Fair Value Of Financial Instruments) (Details) (Commodity Contracts [Member], USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified | ||
Derivatives, Fair Value [Line Items] | ' | ' |
Current derivative assets | $63.90 | $25.60 |
Non-current derivative assets | 19.2 | 1.1 |
Current derivative liabilities | 9 | 6.7 |
Non-current derivative liabilities | 5.1 | 14.1 |
IPL [Member] | ' | ' |
Derivatives, Fair Value [Line Items] | ' | ' |
Current derivative assets | 44 | 20.2 |
Non-current derivative assets | 0.7 | 0.9 |
Current derivative liabilities | 5.2 | 3 |
Non-current derivative liabilities | 3 | 2.2 |
WPL [Member] | ' | ' |
Derivatives, Fair Value [Line Items] | ' | ' |
Current derivative assets | 19.9 | 5.4 |
Non-current derivative assets | 18.5 | 0.2 |
Current derivative liabilities | 3.8 | 3.7 |
Non-current derivative liabilities | $2.10 | $11.90 |
Derivative_Instruments_Gains_A
Derivative Instruments (Gains And Losses From Derivative Instruments) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Regulatory Assets [Member] | ' | ' | ' | ' |
Derivative Instruments, Gain (Loss) [Line Items] | ' | ' | ' | ' |
Gains (losses) from commodity derivative instruments | $8.30 | $2.20 | $13.80 | ($14.20) |
Regulatory Assets [Member] | IPL [Member] | ' | ' | ' | ' |
Derivative Instruments, Gain (Loss) [Line Items] | ' | ' | ' | ' |
Gains (losses) from commodity derivative instruments | 7.3 | -0.4 | 8.7 | -4.6 |
Regulatory Assets [Member] | WPL [Member] | ' | ' | ' | ' |
Derivative Instruments, Gain (Loss) [Line Items] | ' | ' | ' | ' |
Gains (losses) from commodity derivative instruments | 1 | 2.6 | 5.1 | -9.6 |
Regulatory Liabilities [Member] | ' | ' | ' | ' |
Derivative Instruments, Gain (Loss) [Line Items] | ' | ' | ' | ' |
Gains (losses) from commodity derivative instruments | -6.2 | -1 | 63.2 | 16.6 |
Regulatory Liabilities [Member] | IPL [Member] | ' | ' | ' | ' |
Derivative Instruments, Gain (Loss) [Line Items] | ' | ' | ' | ' |
Gains (losses) from commodity derivative instruments | -2 | 3.6 | 13.9 | 9.9 |
Regulatory Liabilities [Member] | WPL [Member] | ' | ' | ' | ' |
Derivative Instruments, Gain (Loss) [Line Items] | ' | ' | ' | ' |
Gains (losses) from commodity derivative instruments | ($4.20) | ($4.60) | $49.30 | $6.70 |
Derivative_Instruments_Derivat
Derivative Instruments Derivative Instruments (Credit Risk-related Contingent Features) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified | ||
Derivative Instruments [Line Items] | ' | ' |
Aggregate fair value | $14.10 | $20.80 |
Credit support to be posted if triggered | 13.9 | 20.8 |
IPL [Member] | ' | ' |
Derivative Instruments [Line Items] | ' | ' |
Aggregate fair value | 8.2 | 5.2 |
Credit support to be posted if triggered | 8.2 | 5.2 |
WPL [Member] | ' | ' |
Derivative Instruments [Line Items] | ' | ' |
Aggregate fair value | 5.9 | 15.6 |
Credit support to be posted if triggered | $5.70 | $15.60 |
Derivative_Instruments_Derivat1
Derivative Instruments Derivative Instruments (Balance Sheet Offsetting) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified | ||
Derivative Instruments [Line Items] | ' | ' |
Derivative assets, Gross (as reported) | $83.10 | $26.70 |
Derivative assets, Net | 72.2 | 23.5 |
Derivative liabilities, Gross (as reported) | 14.1 | 20.8 |
Derivative liabilities, Net | 7.9 | 17.6 |
IPL [Member] | ' | ' |
Derivative Instruments [Line Items] | ' | ' |
Derivative assets, Gross (as reported) | 44.7 | 21.1 |
Derivative assets, Net | 39.8 | 19.5 |
Derivative liabilities, Gross (as reported) | 8.2 | 5.2 |
Derivative liabilities, Net | 3.6 | 3.6 |
WPL [Member] | ' | ' |
Derivative Instruments [Line Items] | ' | ' |
Derivative assets, Gross (as reported) | 38.4 | 5.6 |
Derivative assets, Net | 32.4 | 4 |
Derivative liabilities, Gross (as reported) | 5.9 | 15.6 |
Derivative liabilities, Net | $4.30 | $14 |
Commitments_And_Contingencies_1
Commitments And Contingencies (Narrative) (Details) (USD $) | 9 Months Ended |
In Millions, unless otherwise specified | Sep. 30, 2014 |
Commitments and Contingencies [Line Items] | ' |
Minimum future commitments | $2,438 |
Performance guarantees outstanding | 313 |
Present value abandonment obligation | 31 |
IPL [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Minimum future commitments | 1,922 |
Number of sites monitoring and remediating (in sites) | 26 |
WPL [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Minimum future commitments | 514 |
Number of sites monitoring and remediating (in sites) | 5 |
Capital Purchase Obligation [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Minimum future commitments | 45 |
Capital Purchase Obligation [Member] | IPL [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Minimum future commitments | 26 |
Capital Purchase Obligation [Member] | WPL [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Minimum future commitments | 19 |
Performance guarantees outstanding, 2014 [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Performance guarantees outstanding | 137 |
Performance guarantees outstanding, 2015 [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Performance guarantees outstanding | 53 |
Performance guarantees outstanding, 2016 [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Performance guarantees outstanding | 123 |
Environmental Issue [Member] | WPL [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Environmental mitigation projects to be completed, value | $7 |
Minimum [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Warranty period | '12 months |
Maximum [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Warranty period | '60 months |
Commitments_And_Contingencies_2
Commitments And Contingencies (Operating Expense Purchase Obligations) (Details) (USD $) | 9 Months Ended | |
In Millions, unless otherwise specified | Sep. 30, 2014 | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | $2,438 | |
Individual commitments incurred | 1 | |
IPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 1,922 | |
Individual commitments incurred | 1 | |
WPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 514 | |
Individual commitments incurred | 1 | |
DAEC (IPL) [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 1,557 | [1] |
DAEC (IPL) [Member] | IPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 1,557 | [1] |
DAEC (IPL) [Member] | WPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 0 | [1] |
Other [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 20 | [2] |
Other [Member] | IPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 11 | [2] |
Other [Member] | WPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 7 | [2] |
Purchased Power [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 1,778 | [1] |
Purchased Power [Member] | IPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 1,558 | [1] |
Purchased Power [Member] | WPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 220 | [1] |
Natural Gas [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 341 | |
Natural Gas [Member] | IPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 191 | |
Natural Gas [Member] | WPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 150 | |
Coal [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 265 | [3] |
Coal [Member] | IPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 128 | [3] |
Coal [Member] | WPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 137 | [3] |
SO2 emission allowances [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 34 | |
SO2 emission allowances [Member] | IPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 34 | |
SO2 emission allowances [Member] | WPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 0 | |
Purchased Power [Member] | Other [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 221 | [1] |
Purchased Power [Member] | Other [Member] | IPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | 1 | [1] |
Purchased Power [Member] | Other [Member] | WPL [Member] | ' | |
Commitments and Contingencies [Line Items] | ' | |
Minimum future commitments | $220 | [1] |
[1] | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. | |
[2] | Includes individual commitments incurred during the normal course of business that exceeded $1 million at SeptemberB 30, 2014. | |
[3] | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of SeptemberB 30, 2014 regarding expected future usage, which is subject to change. |
Commitments_And_Contingencies_3
Commitments And Contingencies Commitments And Contingencies (MPG Site Estimated Future Costs And Recorded Liabilities) (Details) (Manufactured Gas Plant Sites [Member], USD $) | 9 Months Ended |
In Millions, unless otherwise specified | Sep. 30, 2014 |
Commitments and Contingencies [Line Items] | ' |
Minimum range of estimated future costs | $13 |
Maximum range of estimated future costs | 32 |
Current and non-current environmental liabilities | 19 |
IPL [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Minimum range of estimated future costs | 12 |
Maximum range of estimated future costs | 30 |
Current and non-current environmental liabilities | 17 |
WPL [Member] | ' |
Commitments and Contingencies [Line Items] | ' |
Minimum range of estimated future costs | 1 |
Maximum range of estimated future costs | 2 |
Current and non-current environmental liabilities | $2 |
Segments_Of_Business_Schedule_
Segments Of Business (Schedule Of Segments Of Business) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | $843.10 | $866.60 | $2,546.20 | $2,444.20 |
Operating income (loss) | 194.8 | 201.4 | 452.3 | 425.3 |
Income (loss) from continuing operations, net of tax | 155.2 | 158.9 | 325.3 | 297.7 |
Income (loss) from discontinued operations, net of tax | -1.9 | -1.3 | -2.2 | -4.9 |
Net income (loss) attributable to common shareowners | 153.3 | 157.6 | 323.1 | 292.8 |
IPL [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 476.2 | 494.4 | 1,417 | 1,355.70 |
Operating income (loss) | 93.9 | 100 | 185.4 | 175.8 |
Net income (loss) attributable to common shareowners | 102.5 | 110 | 164.3 | 155.1 |
WPL [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 354.4 | 360.9 | 1,089.30 | 1,050.60 |
Operating income (loss) | 93.9 | 95.9 | 241.6 | 228.3 |
Net income (loss) attributable to common shareowners | 61.6 | 61.3 | 151 | 137.7 |
Electric [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 771.2 | 798.1 | 2,090.90 | 2,043.40 |
Operating income (loss) | 190.8 | 199.6 | 374.2 | 359.1 |
Electric [Member] | IPL [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 435.9 | 457.6 | 1,164.70 | 1,137.40 |
Operating income (loss) | 94.7 | 99.6 | 150.2 | 146.2 |
Electric [Member] | WPL [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 335.3 | 340.5 | 926.2 | 906 |
Operating income (loss) | 96.1 | 100 | 224 | 212.9 |
Gas [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 47.2 | 39.8 | 364.8 | 310.5 |
Operating income (loss) | -4.4 | -3.4 | 41.3 | 39.5 |
Gas [Member] | IPL [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 28.7 | 24.6 | 208.1 | 180.9 |
Operating income (loss) | -2.8 | -0.7 | 22.1 | 22.6 |
Gas [Member] | WPL [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 18.5 | 15.2 | 156.7 | 129.6 |
Operating income (loss) | -1.6 | -2.7 | 19.2 | 16.9 |
Other Utilities [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 12.2 | 17.4 | 50.6 | 52.4 |
Operating income (loss) | 1.4 | -0.3 | 11.5 | 5.5 |
Other Utilities [Member] | IPL [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 11.6 | 12.2 | 44.2 | 37.4 |
Operating income (loss) | 2 | 1.1 | 13.1 | 7 |
Other Utilities [Member] | WPL [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 0.6 | 5.2 | 6.4 | 15 |
Operating income (loss) | -0.6 | -1.4 | -1.6 | -1.5 |
Utilities Business [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 830.6 | 855.3 | 2,506.30 | 2,406.30 |
Operating income (loss) | 187.8 | 195.9 | 427 | 404.1 |
Income (loss) from continuing operations, net of tax | 164.1 | 171.3 | 315.3 | 292.8 |
Income (loss) from discontinued operations, net of tax | 0 | 0 | 0 | 0 |
Net income (loss) attributable to common shareowners | 164.1 | 171.3 | 315.3 | 292.8 |
Non-Regulated [Member] | Other Segments [Member] | ' | ' | ' | ' |
Segment Reporting Information [Line Items] | ' | ' | ' | ' |
Operating revenues | 12.5 | 11.3 | 39.9 | 37.9 |
Operating income (loss) | 7 | 5.5 | 25.3 | 21.2 |
Income (loss) from continuing operations, net of tax | -8.9 | -12.4 | 10 | 4.9 |
Income (loss) from discontinued operations, net of tax | -1.9 | -1.3 | -2.2 | -4.9 |
Net income (loss) attributable to common shareowners | ($10.80) | ($13.70) | $7.80 | $0 |
Related_Parties_Narrative_Deta
Related Parties (Narrative) (Details) (WPL [Member], WPL Owed ATC [Member], USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified | ||
WPL [Member] | WPL Owed ATC [Member] | ' | ' |
Related Party Transactions [Line Items] | ' | ' |
Net amounts due from (to) related party | ($7) | ($8) |
Related_Parties_Service_Agreem
Related Parties (Service Agreements) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Corporate Services Billings [Member] | IPL [Member] | ' | ' | ' | ' |
Related Party Transactions [Line Items] | ' | ' | ' | ' |
Amounts billed between related parties | $37 | $39 | $111 | $107 |
Corporate Services Billings [Member] | WPL [Member] | ' | ' | ' | ' |
Related Party Transactions [Line Items] | ' | ' | ' | ' |
Amounts billed between related parties | 30 | 28 | 89 | 77 |
Sales Credited [Member] | IPL [Member] | ' | ' | ' | ' |
Related Party Transactions [Line Items] | ' | ' | ' | ' |
Amounts billed between related parties | 2 | 2 | 6 | 5 |
Sales Credited [Member] | WPL [Member] | ' | ' | ' | ' |
Related Party Transactions [Line Items] | ' | ' | ' | ' |
Amounts billed between related parties | 2 | 3 | 4 | 10 |
Purchases Billed [Member] | IPL [Member] | ' | ' | ' | ' |
Related Party Transactions [Line Items] | ' | ' | ' | ' |
Amounts billed between related parties | 106 | 108 | 313 | 260 |
Purchases Billed [Member] | WPL [Member] | ' | ' | ' | ' |
Related Party Transactions [Line Items] | ' | ' | ' | ' |
Amounts billed between related parties | $34 | $16 | $92 | $44 |
Related_Parties_Net_Intercompa
Related Parties (Net Intercompany Payables) (Details) (Corporate Services Billings [Member], USD $) | Sep. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified | ||
IPL [Member] | ' | ' |
Related Party Transactions [Line Items] | ' | ' |
Net amounts due from (to) related party | ($87) | ($62) |
WPL [Member] | ' | ' |
Related Party Transactions [Line Items] | ' | ' |
Net amounts due from (to) related party | ($54) | ($46) |
Related_Parties_Amounts_Billed
Related Parties (Amounts Billed Between Parties) (Details) (WPL [Member], USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
ATC Billings To WPL [Member] | ' | ' | ' | ' |
Related Party Transactions [Line Items] | ' | ' | ' | ' |
Amounts billed between related parties | $24 | $24 | $72 | $72 |
WPL Billings To ATC [Member] | ' | ' | ' | ' |
Related Party Transactions [Line Items] | ' | ' | ' | ' |
Amounts billed between related parties | $3 | $2 | $7 | $9 |
Discontinued_Operations_Compon
Discontinued Operations (Components Of Discontinued Operations In Condensed Consolidated Statements Of Income) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 |
Discontinued Operations and Disposal Groups [Abstract] | ' | ' | ' | ' |
Operating revenues | $0 | $0 | $0 | $0.90 |
Operating expenses | 2.8 | 2.1 | 3.4 | 8.6 |
Income (loss) before income taxes | -2.8 | -2.1 | -3.4 | -7.7 |
Income tax expense (benefit) | -0.9 | -0.8 | -1.2 | -2.8 |
Income (loss) from discontinued operations, net of tax | ($1.90) | ($1.30) | ($2.20) | ($4.90) |