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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Business Segments [Abstract]      
Business Segments [Table Text Block]
 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
2011
 
 
 
Operating Revenue

$928.2


$851.9


$76.3

Fuel and Purchased Power Expense
306.6

306.6

—

Operating and Maintenance Expense
381.2

301.5

79.7

Depreciation Expense
90.4

85.4

5.0

Operating Income (Loss)
150.0

158.4

(8.4
)
Interest Expense
(43.6
)
(35.8
)
(7.8
)
Equity Earnings in ATC
18.4

18.4

—

Other Income
4.4

2.6

1.8

Income (Loss) Before Non-Controlling Interest and Income Taxes
129.2

143.6

(14.4
)
Income Tax Expense (Benefit)
35.6

43.2

(7.6
)
Net Income (Loss)
93.6

100.4

(6.8
)
Less: Non-Controlling Interest in Subsidiaries
(0.2
)
—

(0.2
)
Net Income (Loss) Attributable to ALLETE

$93.8


$100.4

$(6.6)
Total Assets

$2,876.0


$2,579.8


$296.2

Capital Additions

$246.8


$228.0


$18.8
 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
2010
 
 
 
Operating Revenue

$907.0


$835.5


$71.5

Fuel and Purchased Power Expense
325.1

325.1

—

Operating and Maintenance Expense
365.6

292.3

73.3

Depreciation Expense
80.5

76.1

4.4

Operating Income (Loss)
135.8

142.0

(6.2
)
Interest Expense
(39.2
)
(32.3
)
(6.9
)
Equity Earnings in ATC
17.9

17.9

—

Other Income
4.6

3.8

0.8

Income (Loss) Before Non-Controlling Interest and Income Taxes
119.1

131.4

(12.3
)
Income Tax Expense (Benefit)
44.3

51.6

(7.3
)
Net Income (Loss)
74.8

79.8

(5.0
)
Less: Non-Controlling Interest in Subsidiaries
(0.5
)
—

(0.5
)
Net Income (Loss) Attributable to ALLETE

$75.3


$79.8

$(4.5)
Total Assets

$2,609.1


$2,375.4


$233.7

Capital Additions

$260.0


$256.4


$3.6
 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
2009
 
 
 
Operating Revenue

$766.7


$689.4


$77.3

Prior Year Rate Refunds
(7.6
)
(7.6
)
—

Total Operating Revenue
759.1

681.8

77.3

Fuel and Purchased Power Expense
279.5

279.5

—

Operating and Maintenance Expense
308.9

235.8

73.1

Depreciation Expense
64.7

60.2

4.5

Operating Income (Loss)
106.0

106.3

(0.3
)
Interest Expense
(33.8
)
(28.3
)
(5.5
)
Equity Earnings in ATC
17.5

17.5

—

Other Income (Expense)
1.8

5.8

(4.0
)
Income (Loss) Before Non-Controlling Interest and Income Taxes
91.5

101.3

(9.8
)
Income Tax Expense (Benefit)
30.8

35.4

(4.6
)
Net Income (Loss)
60.7

65.9

(5.2
)
Less: Non-Controlling Interest in Subsidiaries
(0.3
)
—

(0.3
)
Net Income (Loss) Attributable to ALLETE

$61.0


$65.9

$(4.9)
Total Assets

$2,393.1


$2,184.0


$209.1

Capital Additions

$303.7


$299.2


$4.5