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Business Segments
 9 Months Ended
Sep. 30, 2012
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 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, aimed at developing or acquiring capital projects that create energy solutions via wind, solar, biomass, hydro, natural gas/liquids, shale resources, clean coal and other clean energy innovations. The Investments and Other segment also includes a small amount of non-rate base generation, approximately 5,500 acres of land available-for-sale in Minnesota, and earnings on cash and investments.

 
Consolidated
 
Regulated Operations
 
Investments and Other
Millions
 
 
 
 
 
For the Quarter Ended September 30, 2012
 
 
 
 
 
Operating Revenue

$248.8

 

$226.4

 

$22.4

Fuel and Purchased Power Expense
79.5

 
79.5

 
—

Operating and Maintenance Expense
98.7

 
76.4

 
22.3

Depreciation Expense
25.0

 
23.5

 
1.5

Operating Income (Loss)
45.6

 
47.0

 
(1.4
)
Interest Expense
(12.3
)
 
(10.2
)
 
(2.1
)
Equity Earnings in ATC
4.9

 
4.9

 
—

Other Income
1.5

 
1.5

 
—

Income (Loss) Before Non-Controlling Interest and Income Taxes
39.7

 
43.2

 
(3.5
)
Income Tax Expense (Benefit)
10.3

 
13.9

 
(3.6
)
Net Income
29.4

 
29.3

 
0.1

Less: Non-Controlling Interest in Subsidiaries
—

 
—

 
—

Net Income Attributable to ALLETE

$29.4

 

$29.3

 

$0.1


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

$226.9

 

$207.4

 

$19.5

Fuel and Purchased Power Expense
74.8

 
74.8

 
—

Operating and Maintenance Expense
90.5

 
70.4

 
20.1

Depreciation Expense
22.7

 
21.4

 
1.3

Operating Income (Loss)
38.9

 
40.8

 
(1.9
)
Interest Expense
(10.9
)
 
(9.2
)
 
(1.7
)
Equity Earnings in ATC
4.7

 
4.7

 
—

Other Income (Expense)
0.5

 
0.6

 
(0.1
)
Income (Loss) Before Non-Controlling Interest and Income Taxes
33.2

 
36.9

 
(3.7
)
Income Tax Expense (Benefit)
12.7

 
13.1

 
(0.4
)
Net Income (Loss)
20.5

 
23.8

 
(3.3
)
Less: Non-Controlling Interest in Subsidiaries
—

 
—

 
—

Net Income (Loss) Attributable to ALLETE

$20.5

 

$23.8

 
$(3.3)
 
Consolidated
 
Regulated Operations
 
Investments and Other
Millions
 
 
 
 
 
For the Nine Months Ended September 30, 2012
 
 
 
 
 
Operating Revenue

$705.2

 

$642.0

 

$63.2

Fuel and Purchased Power Expense
228.7

 
228.7

 
—

Operating and Maintenance Expense
294.8

 
230.6

 
64.2

Depreciation Expense
74.4

 
70.1

 
4.3

Operating Income (Loss)
107.3

 
112.6

 
(5.3
)
Interest Expense
(33.4
)
 
(29.7
)
 
(3.7
)
Equity Earnings in ATC
14.3

 
14.3

 
—

Other Income (Expense)
3.4

 
3.5

 
(0.1
)
Income (Loss) Before Non-Controlling Interest and Income Taxes
91.6

 
100.7

 
(9.1
)
Income Tax Expense (Benefit)
23.4

 
32.6

 
(9.2
)
Net Income
68.2

 
68.1

 
0.1

Less: Non-Controlling Interest in Subsidiaries
—

 
—

 
—

Net Income Attributable to ALLETE

$68.2

 

$68.1

 

$0.1

 
 
 
 
 
 
As of September 30, 2012
 
 
 
 
 
Total Assets

$3,138.1

 

$2,830.9

 

$307.2

Property, Plant and Equipment – Net

$2,239.9

 

$2,180.8

 

$59.1

Accumulated Depreciation

$1,146.7

 

$1,091.5

 

$55.2

Capital Additions

$318.3

 

$312.6

 

$5.7


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

$689.0

 

$632.2

 

$56.8

Fuel and Purchased Power Expense
229.8

 
229.8

 
—

Operating and Maintenance Expense
276.3

 
218.8

 
57.5

Depreciation Expense
67.1

 
63.5

 
3.6

Operating Income (Loss)
115.8

 
120.1

 
(4.3
)
Interest Expense
(32.6
)
 
(26.9
)
 
(5.7
)
Equity Earnings in ATC
13.7

 
13.7

 
—

Other Income
2.3

 
1.8

 
0.5

Income (Loss) Before Non-Controlling Interest and Income Taxes
99.2

 
108.7

 
(9.5
)
Income Tax Expense (Benefit)
24.7

 
28.2

 
(3.5
)
Net Income (Loss)
74.5

 
80.5

 
(6.0
)
Less: Non-Controlling Interest in Subsidiaries
(0.2
)
 
—

 
(0.2
)
Net Income (Loss) Attributable to ALLETE

$74.7

 

$80.5

 
$(5.8)
 
 
 
 
 
 
As of September 30, 2011
 

 
 

 
 

Total Assets

$2,754.4

 

$2,436.0

 

$318.4

Property, Plant and Equipment – Net

$1,902.1

 

$1,847.1

 

$55.0

Accumulated Depreciation

$1,079.0

 

$1,028.6

 

$50.4

Capital Additions

$143.5

 

$128.4

 

$15.1