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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Schedule of annual utility composite depreciation rates
Annual utility composite depreciation rates are shown below:
Annual Utility Composite Depreciation Rates
 
2014
 
2013
 
2012
Electric
 
2.73
%
 
2.79
%
 
2.87
%
Natural gas
 
2.17
%
 
2.19
%
 
2.21
%
Schedule of total AFUDC
Our total AFUDC was as follows for the years ended December 31:
 
 
2014
 
2013
 
2012
Allowance for equity funds used during construction
 
$
11.0

 
$
9.9

 
$
2.6

Allowance for borrowed funds used during construction
 
4.6

 
3.8

 
0.9