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Business Segments
 12 Months Ended
Dec. 31, 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 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, hydro, natural gas/liquids, shale resources, clean coal and other clean energy innovations. This segment also includes other business development and corporate expenditures, a small amount of non-rate base generation, approximately 6,100 acres of land in Minnesota, and earnings on cash and investments. For a description of our reportable business segments, see Item 1. Business.
 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
2012
 
 
 
Operating Revenue

$961.2


$874.4


$86.8

Fuel and Purchased Power Expense
308.7

308.7

—

Operating and Maintenance Expense
397.1

310.0

87.1

Depreciation Expense
100.2

93.9

6.3

Operating Income (Loss)
155.2

161.8

(6.6
)
Interest Expense
(45.5
)
(39.8
)
(5.7
)
Equity Earnings in ATC
19.4

19.4

—

Other Income
6.0

5.1

0.9

Income (Loss) Before Non-Controlling Interest and Income Taxes
135.1

146.5

(11.4
)
Income Tax Expense (Benefit)
38.0

50.4

(12.4
)
Net Income
97.1

96.1

1.0

Less: Non-Controlling Interest in Subsidiaries
—

—

—

Net Income Attributable to ALLETE

$97.1


$96.1


$1.0

Total Assets

$3,253.4


$2,962.4


$291.0

Capital Additions

$432.2


$418.2


$14.0


NOTE 2. BUSINESS SEGMENTS (Continued)

 
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