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Rate Matters (Tables)
 12 Months Ended
Dec. 31, 2014
Public Utilities, General Disclosures [Abstract]  
PSCo 2014 Electric Rate Case
The Staff and OCC’s recommendations, PSCo’s rebuttal testimony and the terms of the settlement agreement are summarized as follows:
2015 Rate Request (Millions of Dollars)
 
Staff
 
OCC
 
PSCo Rebuttal
 
Settlement Agreement
PSCo’s filed rate request
 
$
136.0

 
$
136.0

 
$
136.0

 
$
136.0

Transfer from TCA rider to base rates
 
19.9

 
19.9

 
19.9

 
19.9

PSCo’s filed revenue requirement deficiency
 
155.9

 
155.9

 
155.9

 
155.9

Lower ROE
 
(69.1
)
 
(66.5
)
 
(6.2
)
 
(27.9
)
Capital structure
 
(20.9
)
 
(23.7
)
 
—

 
—

Rate base adjustments (largely the removal of prepaid pension asset)
 
(20.8
)
 
2.3

 
—

 
—

Adjustment to an HTY
 
(82.5
)
 
(82.5
)
 
—

 
(23.9
)
Adjustment to use 13-month average rate base
 
(26.1
)
 
(22.0
)
 
—

 
—

Rate base adjustments for known and measurable plant through September 2014
 
21.9

 
—

 
—

 
—

O&M expense adjustments
 
(7.2
)
 
(16.6
)
 
—

 
—

Depreciation
 
—

 
(3.8
)
 
—

 
—

Property taxes
 
—

 
(12.1
)
 
(5.3
)
 
(5.3
)
Remove CACJA from base rates
 
(62.4
)
 
—

 
(98.7
)
 
(98.7
)
Updated sales forecast
 
—

 
—

 
(15.2
)
 
(15.2
)
Prepaid pension amortization
 
—

 
—

 
—

 
9.5

Non-specified settlement adjustments
 
—

 
—

 
—

 
(31.7
)
Other, net
 
0.1

 
0.1

 
(2.1
)
 
(2.1
)
Total base rate (decrease) increase
 
(111.1
)
 
(68.9
)
 
28.4

 
(39.4
)
CACJA rider mechanism
 
54.2

 
—

 
98.7

 
97.0

TCA rider mechanism — 2015 forecast test year
 
—

 
—

 
—

 
15.6

Transfer from TCA rider to base rates
 
(19.9
)
 
(19.9
)
 
(19.9
)
 
(19.9
)
Total revenue impact
 
$
(76.8
)
 
$
(88.8
)
 
$
107.2

 
$
53.3