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Rate Matters (Tables)
 12 Months Ended
Dec. 31, 2016
Public Utilities, General Disclosures [Abstract]  
NSP-Minnesota's 2016 Multi-Year Electric Rate Case - Rate Request [Table Text Block]
In December 2015, the MPUC approved interim rates for 2016. 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
NSP-Minnesota 2016 Rate Case Settlement [Table Text Block]
(Millions of Dollars, incremental)
 
2016
 
2017
 
2018
 
2019
 
Total
Settlement revenues (a)
 
$
74.99

 
$
59.86

 
$
—

 
$
50.12

 
$
184.97

NSP-Minnesota’s sales true-up
 
59.95

 
—

 
—

 
(0.20
)
 
59.75

   Total rate impact (b)
 
$
134.94

 
$
59.86

 
$
—

 
$
49.92

 
$
244.72

 
 
 
 
 
 
 
 
 
 
 
(a) 
The settlement revenues are based on the DOC’s sales forecast.
(b) 
The total rate impact reflects an increase of 4.62 percent in 2016; 2.05 percent in 2017; 0 percent in 2018 and 1.71 percent in 2019.
NSP-WI 2017 Electric Rate Request [Table Text Block]
The differences between NSP-Wisconsin’s original electric rate request and the PSCW’s approved electric increase are summarized below:
Electric Rate Request (Millions of Dollars)
 
NSP-Wisconsin Request
 
Final Decision
Rate base investments
 
$
11.0

 
7.6

Generation and transmission expenses (excluding fuel and purchased power) (a)
 
6.8

 
6.1

Fuel and purchased power expenses
 
11.0

 
10.7

Subtotal
 
28.8

 
24.4

2015 fuel refund (b)
 
(9.5
)
 
—

Department of Energy settlement refund
 
(1.9
)
 
(1.9
)
Total electric rate increase
 
$
17.4

 
$
22.5

 
(a) 
Includes Interchange Agreement billings. For financial reporting purposes, these expenses are included in O&M.
(b) 
In July 2016, the PSCW required NSP-Wisconsin to return the 2015 fuel refund directly to customers, rather than using it to offset the proposed 2017 rate increase, as originally proposed by NSP-Wisconsin. This decision, when combined with the increase in forecasted fuel and purchased power expense, effectively increased NSP-Wisconsin’s requested electric rate increase to $29.9 million, or 4.2 percent.
SPS' Texas 2016 Electric Rate Case
In December 2016, SPS reached an unopposed settlement that resolves all issues in the rate case. The following table reflects the total estimated impact:
(Millions of Dollars)
 
Settlement
Base rate increase, retroactive to July 20, 2016
 
$
35.2

Power factor revenues (a)
 
12.6

Rate case expenses to be addressed in a separate proceeding
 
4.0

   Total estimated impact
 
$
51.8


(a) 
SPS’ request assumed customers would adjust their power factors, which would reduce revenue. To the extent power factor revenues are less than $12.6 million, a mechanism will be established to ensure SPS recovers this amount and effectively offset lower anticipated power factor charges.

SPS' New Mexico 2016 Electric Rate Case [Table Text Block]
The major components of the requested rate increase are summarized below:
(Millions of Dollars)
 
Request
Capital expenditures
 
$
20.1

Allocator changes, including wholesale load reductions
 
11.5

Transmission expense, net of revenue, including charges paid to SPP for construction of regionally shared transmission projects
 
4.7

Depreciation, including adjustment of service life for the Tolk generating station
 
3.6

Rate case expenses
 
1.1

Other, net
 
0.4

Requested rate increase
 
$
41.4