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Rate Matters (Tables)
 3 Months Ended
Mar. 31, 2016
Public Utilities, General Disclosures [Abstract]  
NSP-Minnesota's 2016 Multi-Year Electric Rate Case [Table Text Block]
The major components of the requested rate increase are summarized below:
(Millions of Dollars)
 
2016
 
2017
 
2018
 
Total
2014 multi-year rate case items:
 
 
 
 
 
 
 
 
Excess depreciation reserve
 
$
26.0

 
$
51.0

 
$
—

 
$
77.0

Department of Energy (DOE) settlement
 
25.7

 
—

 
—

 
25.7

Monticello life cycle management (LCM)/extended power uprate (EPU)
 
11.2

 
(1.6
)
 
(1.5
)
 
8.1

 
 
62.9

 
49.4

 
(1.5
)
 
110.8

Additional items:
 
 
 
 
 
 
 
 
Capital investments
 
128.7

 
12.8

 
44.6

 
186.1

Property taxes
 
30.2

 
7.6

 
5.2

 
43.0

NOL carryforwards
 
(6.3
)
 
(24.5
)
 
(6.5
)
 
(37.3
)
Other costs
 
(20.9
)
 
6.8

 
8.6

 
(5.5
)
 
 
131.7

 
2.7

 
51.9

 
186.3

 
 
 
 
 
 
 
 
 
Total rate request
 
$
194.6

 
$
52.1

 
$
50.4

 
$
297.1
NSP-Minnesota's 2016 Multi-Year Electric Rate Case - Rate Request [Table Text Block]
The request is detailed in the table below:
Request (Millions of Dollars)
 
2016
 
2017
 
2018
Rate request
 
$
194.6

 
$
52.1

 
$
50.4

Increase percentage
 
6.4
%
 
1.7
%
 
1.7
%
Interim request
 
$
163.7

 
$
44.9

 
N/A

Rate base
 
$
7,800

 
$
7,700

 
$
7,700