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Component: (Network and Table)
Network
2301302 - Disclosure - Summary of Significant Accounting Policies (Tables)
(http://www.wecenergygroup.com/role/SummaryOfSignificantAccountingPoliciesTables)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000783325 (http://www.sec.gov/CIK)
Accounting Policies [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
Accounting Policies [Abstract]
 
Schedule of inventory
Our inventory as of December 31 consisted of:
(in millions)
 
2016
 
2015
Natural gas in storage
 
$
223.1

 
$
284.1

Materials and supplies
 
206.5

 
219.2

Fossil fuel
 
158.0

 
183.7

Total
 
$
587.6

 
$
687.0


  
Schedule of annual utility composite depreciation rates
Annual utility composite depreciation rates are shown below:
Annual Utility Composite Depreciation Rates
 
2016
 
2015
 
2014
WE
 
3.00%
 
3.01%
 
2.93%
WPS *
 
2.58%
 
1.30%
 
N/A
WG
 
2.34%
 
2.36%
 
2.69%
PGL *
 
3.31%
 
1.67%
 
N/A
NSG *
 
2.44%
 
1.22%
 
N/A
MERC *
 
2.53%
 
1.26%
 
N/A
MGU *
 
2.63%
 
1.32%
 
N/A

*  
The rates shown for 2015 are for a partial year as a result of the acquisition of Integrys. The full year rate would be approximately double the rate shown.
  
Schedule Of public utilities allowance for funds used during construction
Average AFUDC rates are shown below:
 
 
2016
 
 
Average AFUDC Retail Rate
 
Average AFUDC Wholesale Rate
WE
 
8.45%
 
2.73%
WPS
 
7.72%
 
3.00%
WG
 
8.33%
 
N/A
  
Allowance for funds used during construction

Our regulated utilities recorded the following AFUDC for the years ended December 31:
(in millions)
 
2016
 
2015
 
2014
AFUDC – Debt
 
$
10.9

 
$
8.6

 
$
2.3

AFUDC – Equity
 
$
25.1

 
$
20.1

 
$
5.6

  
Schedule of assumptions used to estimate the fair value of stock options granted
The following table shows the estimated fair value per stock option granted along with the weighted-average assumptions used in the valuation models:
 
 
2016
 
2015
 
2014
Non-qualified stock options granted
 
794,764

 
516,475

 
899,500

 
 
 
 
 
 
 
Estimated fair value per non-qualified stock option
 
$
5.14

 
$
5.29

 
$
4.18

 
 
 
 
 
 
 
Assumptions used to value the options:
 
 
 
 
 
 
Risk-free interest rate
 
0.4% – 2.2%

 
0.1% – 2.1%

 
0.1% – 3.0%

Dividend yield
 
4.0
%
 
3.7
%
 
3.8
%
Expected volatility
 
18.1
%
 
18.0
%
 
18.0
%
Expected life (years)
 
6.1

 
5.8

 
5.8