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Rate Matters (Tables)
 9 Months Ended
Sep. 30, 2017
Public Utilities, General Disclosures [Abstract]  
Colorado 2017 Multi-Year Electric Rate Case [Table Text Block]
The request, summarized below, is based on forecast test years (FTY) ending Dec. 31, a 10.0 percent return on equity (ROE) and an equity ratio of 55.25 percent.
Revenue Request (Millions of Dollars)
 
2018
 
2019
 
2020
 
2021
 
Total
Revenue request
 
$
74.6

 
$
74.9

 
$
59.7

 
$
35.7

 
$
244.9

Clean Air Clean Jobs Act (CACJA) revenue conversion to base rates (a)
 
90.4

 
—

 
—

 
—

 
90.4

Transmission Cost Adjustment (TCA) revenue conversion to base rates (a)
 
42.7

 
—

 
—

 
—

 
42.7

  Total (b)
 
$
207.7

 
$
74.9

 
$
59.7

 
$
35.7

 
$
378.0

 
 
 
 
 
 
 
 
 
 
 
Expected year-end rate base (billions of dollars) (b)
 
$
6.8

 
$
7.1

 
$
7.3

 
$
7.4

 
 
     
(a) 
The roll-in of each of the TCA and CACJA rider revenues into base rates will not have an impact on total customer bills or total revenue as these costs are already being recovered through a rider. Transmission investments for 2019 through 2021 will be recovered through the TCA rider.

(b) 
This base rate request does not include the impacts associated with the renewable energy standard adjustment and retail electric commodity adjustment for the Rush Creek wind investments or any impacts of the proposed Colorado Energy Plan.
Colorado 2017 Multi-Year Gas Rate Case [Table Text Block]
The request, detailed below, is based on FTYs, a 10.0 percent ROE and an equity ratio of 55.25 percent.
Revenue Request (Millions of Dollars)
 
2018
 
2019
 
2020
 
Total
Revenue request
 
$
63.2

 
$
32.9

 
$
42.9

 
$
139.0

Pipeline System Integrity Adjustment (PSIA) revenue conversion to base rates (a)
 
—

 
93.9

 
—

 
93.9

Total
 
$
63.2

 
$
126.8

 
$
42.9

 
$
232.9

 
 
 
 
 
 
 
 
 
Expected year-end rate base (billions of dollars) (b)
 
$
1.5

 
$
2.3

 
$
2.4

 
 
 
(a)  
The roll-in of PSIA rider revenue into base rates will not have an impact on customer bills or total revenue as these costs are already being recovered through the rider. PSCo plans to request new PSIA rates for 2018 in November 2017. The recovery of incremental PSIA related investments in 2019 and 2020 are included in the base rate request.

(b)  
The additional rate base in 2019 predominantly reflects the roll-in of capital associated with the PSIA rider.
Colorado 2017 Multi-Year Gas Rate Case - Answer Testimony [Table Text Block]
The following represents adjustments to PSCo’s filed request made by Staff and OCC for 2018:
(Millions of Dollars)
 
Staff
 
OCC
Filed 2018 new revenue request
 
$
63.2

 
$
63.2

Impact of the change in test year
 
4.4

 
4.4

PSCo’s filed 2016 HTY
 
$
67.6

 
$
67.6

 
 
 
 
 
Recommended adjustments:
 
 
 
 
ROE (9.0 percent)
 
(13.5
)
 
(13.5
)
Capital structure and cost of debt
 
(10.2
)
 
(7.5
)
Change in amortization period
 
(5.4
)
 
—

Prepaid pension and retiree medical assets
 
(5.2
)
 
—

Change from 2016 year end to average rate base
 
(4.8
)
 
(4.8
)
Other, net
 
(5.0
)
 
(5.5
)
Total adjustments
 
$
(44.1
)
 
$
(31.3
)
 
 
 
 
 
Total recommended rate increase
 
$
23.5

 
$
36.3