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Rate Matters (Tables)
 3 Months Ended
Mar. 31, 2017
Public Utilities, General Disclosures [Abstract]  
NSP-Minnesota's 2016 Multi-Year Electric Rate Case - Rate Request
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
(Millions of Dollars, incremental)
 
2016
 
2017
 
2018
 
2019
 
Total
Settlement revenues
 
$
74.99

 
$
59.86

 
$
—

 
$
50.12

 
$
184.97

NSP-Minnesota’s sales true-up
 
59.95

 
—

 
—

 
(0.20
)
 
59.75

   Total rate impact
 
$
134.94

 
$
59.86

 
$
—

 
$
49.92

 
$
244.72
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 Southwest Power Pool, Inc. (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