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Rate Matters (Tables)
 12 Months Ended
Dec. 31, 2013
Public Utilities, General Disclosures [Abstract]  
CPUC decision in the PSCo Colorado 2013 Gas Rate Case
The following table summarizes the CPUC decision:
(Millions of Dollars)
 
CPUC Decision
PSCo deficiency based on a FTY
 
$
44.8

HTY adjustment
 
(5.4
)
ROE and capital structure adjustments
 
(8.3
)
Revenue adjustments
 
(1.4
)
Other
 
(0.1
)
Recommendation
 
29.6

Neutralize PSIA - base rate transfer
 
(13.8
)
Incremental base revenue
 
$
15.8