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Business Segments (Tables)
 6 Months Ended
Jun. 30, 2012
Business Segments [Abstract]  
Business Segments [Table Text Block]
 
Consolidated
 
Regulated Operations
 
Investments and Other
Millions
 
 
 
 
 
For the Quarter Ended June 30, 2012
 
 
 
 
 
Operating Revenue

$216.4

 

$197.0

 

$19.4

Fuel and Purchased Power Expense
72.1

 
72.1

 
—

Operating and Maintenance Expense
96.2

 
76.1

 
20.1

Depreciation Expense
24.8

 
23.4

 
1.4

Operating Income (Loss)
23.3

 
25.4

 
(2.1
)
Interest Expense
(10.1
)
 
(9.9
)
 
(0.2
)
Equity Earnings in ATC
4.8

 
4.8

 
—

Other Income
1.2

 
1.2

 
—

Income (Loss) Before Non-Controlling Interest and Income Taxes
19.2

 
21.5

 
(2.3
)
Income Tax Expense (Benefit)
4.8

 
7.1

 
(2.3
)
Net Income
14.4

 
14.4

 
—

Less: Non-Controlling Interest in Subsidiaries
—

 
—

 
—

Net Income Attributable to ALLETE

$14.4

 

$14.4

 
—


 
Consolidated
 
Regulated Operations
 
Investments and Other
Millions
 
 
 
 
 
For the Quarter Ended June 30, 2011
 
 
 
 
 
Operating Revenue

$219.9

 

$201.8

 

$18.1

Fuel and Purchased Power Expense
76.0

 
76.0

 
—

Operating and Maintenance Expense
95.7

 
77.2

 
18.5

Depreciation Expense
22.1

 
20.9

 
1.2

Operating Income (Loss)
26.1

 
27.7

 
(1.6
)
Interest Expense
(11.0
)
 
(9.1
)
 
(1.9
)
Equity Earnings in ATC
4.6

 
4.6

 
—

Other Income
1.0

 
0.6

 
0.4

Income (Loss) Before Non-Controlling Interest and Income Taxes
20.7

 
23.8

 
(3.1
)
Income Tax Expense (Benefit)
3.8

 
5.5

 
(1.7
)
Net Income (Loss)
16.9

 
18.3

 
(1.4
)
Less: Non-Controlling Interest in Subsidiaries
(0.1
)
 
—

 
(0.1
)
Net Income (Loss) Attributable to ALLETE

$17.0

 

$18.3

 
$(1.3)
 
Consolidated
 
Regulated Operations
 
Investments and Other
Millions
 
 
 
 
 
For the Six Months Ended June 30, 2012
 
 
 
 
 
Operating Revenue

$456.4

 

$415.6

 

$40.8

Fuel and Purchased Power Expense
149.2

 
149.2

 
—

Operating and Maintenance Expense
196.1

 
154.2

 
41.9

Depreciation Expense
49.4

 
46.6

 
2.8

Operating Income (Loss)
61.7

 
65.6

 
(3.9
)
Interest Expense
(21.1
)
 
(19.5
)
 
(1.6
)
Equity Earnings in ATC
9.4

 
9.4

 
—

Other Income (Expense)
1.9

 
2.0

 
(0.1
)
Income (Loss) Before Non-Controlling Interest and Income Taxes
51.9

 
57.5

 
(5.6
)
Income Tax Expense (Benefit)
13.1

 
18.7

 
(5.6
)
Net Income
38.8

 
38.8

 
—

Less: Non-Controlling Interest in Subsidiaries
—

 
—

 
—

Net Income Attributable to ALLETE

$38.8

 

$38.8

 
—

 
 
 
 
 
 
As of June 30, 2012
 
 
 
 
 
Total Assets

$2,962.2

 

$2,755.4

 

$206.8

Property, Plant and Equipment – Net

$2,177.5

 

$2,119.9

 

$57.6

Accumulated Depreciation

$1,124.5

 

$1,070.1

 

$54.4

Capital Additions

$235.1

 

$232.3

 

$2.8


 
Consolidated
 
Regulated Operations
 
Investments and Other
Millions
 
 
 
 
 
For the Six Months Ended June 30, 2011
 
 
 
 
 
Operating Revenue

$462.1

 

$424.8

 

$37.3

Fuel and Purchased Power Expense
155.0

 
155.0

 
—

Operating and Maintenance Expense
185.8

 
148.4

 
37.4

Depreciation Expense
44.4

 
42.1

 
2.3

Operating Income (Loss)
76.9

 
79.3

 
(2.4
)
Interest Expense
(21.7
)
 
(17.7
)
 
(4.0
)
Equity Earnings in ATC
9.0

 
9.0

 
—

Other Income
1.8

 
1.2

 
0.6

Income (Loss) Before Non-Controlling Interest and Income Taxes
66.0

 
71.8

 
(5.8
)
Income Tax Expense (Benefit)
12.0

 
15.1

 
(3.1
)
Net Income (Loss)
54.0

 
56.7

 
(2.7
)
Less: Non-Controlling Interest in Subsidiaries
(0.2
)
 
—

 
(0.2
)
Net Income (Loss) Attributable to ALLETE

$54.2

 

$56.7

 
$(2.5)
 
 
 
 
 
 
As of June 30, 2011
 

 
 

 
 

Total Assets

$2,645.5

 

$2,381.6

 

$263.9

Property, Plant and Equipment – Net

$1,861.1

 

$1,808.9

 

$52.2

Accumulated Depreciation

$1,062.6

 

$1,011.3

 

$51.3

Capital Additions

$79.7

 

$69.3

 

$10.4