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Income Tax Expense | 9 Months Ended
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Sep. 30, 2012
Income Tax Expense [Abstract] |
Income Tax Expense [Text Block] | INCOME TAX EXPENSE
|  | Quarter Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
Millions |  |  |  |  |  |  |  |
Current Tax Expense |  |  |  |  |  |  |  |
Federal (a) |  | — |  |  | — |  |  | — |  |  | — |
State (a) |  | — |  |  | $(0.1) |  | — |  |  |  | $0.1 |
Total Current Tax Expense (Benefit) |  | — |  |  | (0.1 | ) |  | — |  |  | 0.1 |
Deferred Tax Expense (Benefit) |  |  |  |  |  |  |  |
Federal (b) |  |  | $10.5 |  |  | 8.5 |  |  |  | $24.2 |  |  | 19.3 |
State (b) |  | (0.7 | ) |  | 4.5 |  |  | (1.9 | ) |  | 6.0 |
Change in Valuation Allowance (c) |  | 0.7 |  |  | — |  |  | 1.7 |  |  | — |
Investment Tax Credit Amortization |  | (0.2 | ) |  | (0.2 | ) |  | (0.6 | ) |  | (0.7 | )
Total Deferred Tax Expense |  | 10.3 |  |  | 12.8 |  |  | 23.4 |  |  | 24.6 |
Total Income Tax Expense |  |  | $10.3 |  |  |  | $12.7 |  |  |  | $23.4 |  |  |  | $24.7 |
(a) | For the quarter and nine months ended September 30, 2012, the federal and state current tax expense of zero and zero, respectively, ($(0.1) million and $0.1 million for the quarter and nine months ended September 30, 2011) is due to a net operating loss (NOL) which resulted primarily from the bonus depreciation provision of the Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010. The 2012 and 2011 federal and state NOLs will be carried forward to offset future taxable income.
(b) | For the quarter and nine months ended September 30, 2012, the state deferred tax benefit of $0.7 million and $1.9 million, respectively, is due to state renewable tax credits earned which will be carried forward to offset future state tax expense. The nine months ended September 30, 2011, included a second quarter income tax benefit of $2.9 million related to the MPUC approval of our request to defer the retail portion of the tax charge taken in 2010 resulting from the PPACA, and a first quarter benefit for the reversal of a $6.2 million deferred tax liability related to a revenue receivable that Minnesota Power agreed to forgo as part of a stipulation and settlement agreement in its 2010 rate case.
(c) | For the quarter and nine months ended September 30, 2012, the valuation allowance is due to state renewable tax credits earned in 2012 which are not expected to be utilized within their allowable tax carryforward period.
For the nine months ended September 30, 2012, the effective tax rate was 25.5 percent (24.9 percent for the nine months ended September 30, 2011; the effective tax rate for the nine months ended September 30, 2011, was lowered by 6.2 percentage points due to the non-recurring reversal of the deferred tax liability related to a revenue receivable that Minnesota Power agreed to forgo as part of a stipulation and settlement agreement in its 2010 rate case, and by 2.9 percentage points due to the non-recurring income tax benefit related to the MPUC approval of our request to defer the retail portion of the tax charge taken in 2010 resulting from the PPACA). The increase in the effective tax rate from the effective tax rate for the nine months ended September 30, 2011, was primarily due to the 2011 non-recurring items above, partially offset by increased renewable tax credits in 2012. The effective tax rate deviated from the statutory rate of approximately 41 percent primarily due to deductions for AFUDC – Equity, investment tax credits, renewable tax credits and depletion, and in 2011, for the non-recurring items discussed above. Uncertain Tax Positions. As of September 30, 2012, we had gross unrecognized tax benefits of $2.7 million ($11.4 million as of December 31, 2011). The $8.7 million decrease in the unrecognized tax benefits balance for the nine months ended September 30, 2012, was primarily due to the resolution of a federal audit matter for prior years’ activity. Of the total gross unrecognized tax benefits, $0.5 million represents the amount of unrecognized tax benefits included in the Consolidated Balance Sheet, that, if recognized, would favorably impact the effective income tax rate. ALLETE’s IRS exam for tax years 2005 through 2009 is currently under review at the IRS appeals office. If the IRS appeals process is completed during the next twelve months, substantially all of the unrecognized tax benefits as of September 30, 2012, could be reversed. The unrecognized tax benefits are primarily due to tax positions which are timing in nature and therefore would have an immaterial impact on our effective tax rate if recognized.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 136, 172 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 44, 45, 46, 47, 48, 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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