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Business Segments
 6 Months Ended
Jun. 30, 2013
Business Segments [Abstract]  
Business Segments [Text Block]
BUSINESS SEGMENTS

Regulated Operations includes our regulated utilities, Minnesota Power and SWL&P, as well as our investment in ATC, a Wisconsin-based regulated utility that owns and maintains electric transmission assets in parts of Wisconsin, Michigan, Minnesota and Illinois. Investments and Other is comprised primarily of BNI Coal, our coal mining operations in North Dakota, ALLETE Properties, our Florida real estate investment, and ALLETE Clean Energy, our business aimed at developing or acquiring capital projects that create energy solutions via wind, solar, biomass, midstream gas and oil infrastructure, among other energy-related projects. This segment also includes other business development and corporate expenditures, a small amount of non-rate base generation, approximately 6,000 acres of land in Minnesota, and earnings on cash and investments.

 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
For the Quarter Ended June 30, 2013
 
 
 
Operating Revenue

$235.6


$215.8


$19.8

Fuel and Purchased Power Expense
78.7

78.7

—

Operating and Maintenance Expense
103.8

82.8

21.0

Depreciation Expense
28.7

27.1

1.6

Operating Income (Loss)
24.4

27.2

(2.8
)
Interest Expense
(12.8
)
(10.4
)
(2.4
)
Equity Earnings in ATC
5.0

5.0

—

Other Income
1.5

1.1

0.4

Income (Loss) Before Income Taxes
18.1

22.9

(4.8
)
Income Tax Expense (Benefit)
4.1

6.6

(2.5
)
Net Income (Loss)

$14.0


$16.3

$(2.3)

 
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 Income Taxes
19.2

21.5

(2.3
)
Income Tax Expense (Benefit)
4.8

7.1

(2.3
)
Net Income

$14.4


$14.4

—

 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
For the Six Months Ended June 30, 2013
 
 
 
Operating Revenue

$499.4


$457.2


$42.2

Fuel and Purchased Power Expense
165.2

165.2

—

Operating and Maintenance Expense
208.5

165.0

43.5

Depreciation Expense
56.9

53.9

3.0

Operating Income (Loss)
68.8

73.1

(4.3
)
Interest Expense
(25.1
)
(21.1
)
(4.0
)
Equity Earnings in ATC
10.2

10.2

—

Other Income
4.2

2.2

2.0

Income (Loss) Before Income Taxes
58.1

64.4

(6.3
)
Income Tax Expense (Benefit)
11.6

16.0

(4.4
)
Net Income (Loss)

$46.5


$48.4

$(1.9)
 
 
 
 
As of June 30, 2013
 
 
 
Total Assets

$3,350.9


$2,997.0


$353.9

Property, Plant and Equipment – Net

$2,397.2


$2,329.6


$67.6

Accumulated Depreciation

$1,202.8


$1,143.2


$59.6

Capital Additions

$100.2


$97.2


$3.0


 
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 Income Taxes
51.9

 
57.5

 
(5.6
)
Income Tax Expense (Benefit)
13.1

 
18.7

 
(5.6
)
Net Income

$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