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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 3 Months Ended
Mar. 31, 2013
GOODWILL AND OTHER INTANGIBLE ASSETS  
Identifiable intangible assets other than goodwill

March 31, 2013
December 31, 2012
(Millions)
Gross Carrying
Amount
Accumulated
Amortization
Net Carrying
Amount
Gross Carrying
Amount
Accumulated
Amortization
Net Carrying
Amount
Amortized intangible assets
 

 

 

 

 

 

Customer-related (1)
$
22.4

$
(15.0
)
$
7.4

$
22.4

$
(14.7
)
$
7.7

Contractual service agreements (2)
15.6

—

15.6

—

—

—

Patents/intellectual property (3)
7.2

(0.3
)
6.9

7.2

(0.3
)
6.9

Compressed natural gas fueling contract assets (4)
5.6

(1.7
)
3.9

5.6

(1.3
)
4.3

Renewable energy credits (5)
5.1

—

5.1

3.1

—

3.1

Nonregulated easements (6) 
3.8

(1.0
)
2.8

3.8

(0.9
)
2.9

Customer-owned equipment modifications (7)
4.0

(0.6
)
3.4

4.0

(0.5
)
3.5

Other
0.5

(0.3
)
0.2

0.5

(0.2
)
0.3

Total
$
64.2

$
(18.9
)
$
45.3

$
46.6

$
(17.9
)
$
28.7

Unamortized intangible assets
 

 

 

 

 

 

MGU trade name
$
5.2

$
—

$
5.2

$
5.2

$
—

$
5.2

Trillium trade name
3.5

—

3.5

3.5

—

3.5

Pinnacle trade name
1.5

—

1.5

1.5

—

1.5

Total intangible assets
$
74.4

$
(18.9
)
$
55.5

$
56.8

$
(17.9
)
$
38.9


(1) 
Represents customer relationship assets associated with PELLC’s former nonregulated retail natural gas and electric operations and Trillium USA (Trillium) and Pinnacle CNG Systems (Pinnacle) compressed natural gas fueling operations. The remaining weighted-average amortization period for customer-related intangible assets at March 31, 2013, was approximately 9 years.

(2) 
Represents contractual service agreements related to maintenance on the combustion turbine generators at the Fox Energy Center. The remaining amortization period for these intangible assets at March 31, 2013, was approximately 7 years.

(3) 
Represents the fair value of patents/intellectual property at Pinnacle related to a system for more efficiently compressing natural gas to allow for faster fueling. The remaining amortization period at March 31, 2013, was approximately 9 years.

(4) 
Represents the fair value of Trillium and Pinnacle contracts acquired in September 2011. The remaining amortization period at March 31, 2013, was approximately 8 years.

(5) 
Used at Integrys Energy Services to comply with state Renewable Portfolio Standards and to support customer commitments.

(6) 
Relates to easements supporting a pipeline at Integrys Energy Services. The easements are amortized on a straight-line basis, with a remaining amortization period at March 31, 2013, of approximately 11 years.

(7) 
Relates to modifications made by Integrys Energy Services and Trillium to customer-owned equipment. These intangible assets are amortized on a straight-line basis, with a remaining weighted-average amortization period at March 31, 2013, of approximately 11 years.
Intangible asset amortization expense for the next five fiscal years
 
For the Year Ending December 31
(Millions)
2013
2014
2015
2016
2017
Amortization to be recorded in nonregulated cost of sales
$
6.7

$
1.2

$
1.1

$
0.9

$
0.9

Amortization to be recorded in depreciation and amortization expense
3.8

4.1

4.1

3.9

3.8