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Rate Matters (Tables)
 12 Months Ended
Dec. 31, 2015
Public Utilities, General Disclosures [Abstract]  
Colorado 2015 Multi-Year Gas Rate Case - Rebuttal Testimony
In July 2015, PSCo filed rebuttal testimony with adjustments and modified recovery between base rates and the PSIA rider. The revised request is summarized below:
(Millions of Dollars)
 
2015
 
2016 Step
 
2017 Step
PSCo’s filed base rate request
 
$
40.5

 
$
7.6

 
$
18.1

Shift O&M expenses between PSIA and base rates
 
—

 
7.0

 
6.4

Rebuttal corrections and adjustments
 
—

 
—

 
(7.7
)
Total base rate increase
 
$
40.5

 
$
14.6

 
$
16.8

Incremental PSIA rider revenues
 
(0.1
)
 
14.7

 
21.7

Total revenue impact from rebuttal
 
$
40.4

 
$
29.3

 
$
38.5

Requested ROE
 
10.1
%
 
10.1
%
 
10.3
%
Rate base
 
$
1,260

 
$
1,310

 
$
1,360
Colorado 2015 Multi-Year Gas Rate Case - Base Rate ALJ Recommendation and CPUC Deliberations
The following table reflects the ALJ’s position and the CPUC’s written order (estimated):
(Millions of Dollars)
 
ALJ
 
CPUC’s Written Order
PSCo’s filed 2015 base rate request (a)
 
$
40.5

 
$
40.5

ROE
 
(7.8
)
 
(7.8
)
Capital structure and cost of debt
 
(0.5
)
 
(0.5
)
Cherokee pipeline adjustment
 
4.1

 
4.1

Move to 2014 HTY
 
(14.1
)
 
(14.1
)
O&M expenses
 
(3.0
)
 
(2.4
)
Other, net
 
(1.1
)
 
(1.1
)
Overall recommended rate increase
 
$
18.1

 
$
18.7


(a)
The ALJ’s recommendation and the CPUC’s written order also includes approximately $20.0 million of PSIA costs be transferred to base rates, effective Jan. 1, 2016.
Colorado 2015 Multi-Year Gas Rate Case - PSIA Rider ALJ Recommendation and CPUC Deliberations
The ALJ’s recommendation, as well as the CPUC’s written order for the PSIA rider, are as follows (estimated):
 
 
ALJ
 
CPUC’s Written Order
(Millions of Dollars)
 
2016
 
2017
 
2016
 
2017
PSCo’s filed incremental PSIA request
 
$
21.7

 
$
21.2

 
$
21.7

 
$
21.2

Transfer PSIA costs to base rates
 
(20.5
)
 
—

 
(20.5
)
 
—

PSIA cost recovery remaining in base
 
(4.3
)
 
—

 
(4.3
)
 
—

Projects not recovered through the PSIA
 
(3.6
)
 
(2.0
)
 
(3.3
)
 
(0.8
)
ROE and capital structure
 
(0.3
)
 
(1.6
)
 
(0.3
)
 
(1.6
)
Total
 
$
(7.0
)
 
$
17.6

 
$
(6.7
)
 
$
18.8
Colorado 2015 Multi-Year Gas Rate Case - Impact of CPUC Written Order
The following table summarizes the estimated annual pre-tax impact of the CPUC’s written order:
(Millions of Dollars)
 
2015
 
2016
 
2017
Base rate increase
 
$
18.7

 
$
19.7

 
$
—

Incremental PSIA rider revenues
 
(0.2
)
 
(6.7
)
 
18.8

Expense deferrals, net amortization (a)
 
(3.6
)
 
1.5

 
5.2

Estimated pre-tax impact
 
$
14.9

 
$
14.5

 
$
24.0


(a)
Deferral and amortization impacts relate primarily to recognition of accelerated amortization of prepaid pension assets and deferrals of pension expense in excess of the amount approved in the prior general gas rate case.