DTE Energy 2014 Annual Report Download - page 66

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


Summary of property by classification as of December 31:


DTE Electric
Generation  
$ 11,127
Distribution 
7,603
Total DTE Electric 
18,730
DTE Gas
Distribution 
2,834
Storage 
431
Other 
836
Total DTE Gas 
4,101
Non-utility and other 
2,292
Total 
25,123

DTE Electric
Generation
(4,004)
Distribution 
(2,947)
Total DTE Electric 
(6,951)
DTE Gas
Distribution 
(1,129)
Storage
(138)
Other
(338)
Total DTE Gas 
(1,605)
Non-utility and other 
(767)
Total
(9,323)
  
$ 15,800
AFUDC and interest capitalized was approximately $37 million and $33 million for the years ended December 31, 2014 and 2013, respectively.
The composite depreciation rate for DTE Electric was approximately 3.4% in 2014 and 2013 and 3.3% in 2012. The composite depreciation rate for
DTE Gas was 2.4% in 2014, 2013 and 2012. The average estimated useful life for each major class of utility property, plant and equipment as of
December 31, 2014 follows:





Electric
40
41
N/A
Gas
N/A
50
53
The estimated useful lives for major classes of non-utility assets and facilities range from 3 to 55 years.
Capitalized software costs are classified as Property, plant and equipment and the related amortization is included in Accumulated depreciation,
depletion and amortization on the Consolidated Statements of Financial Position. The Company capitalizes the costs associated with computer software it
develops or obtains for use in its business. The Company amortizes capitalized software costs on a straight-line basis over the expected period of benefit,
ranging from 3 to 15 years.
63