Borrowings and Other Financing Instruments (Tables)

9 Months Ended

Sep. 30, 2014

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

At Sept. 30, 2014, PSCo had the following committed credit facility available (in millions of dollars):

Credit Facility (a)		Drawn(b)		Available
$	700.0	$	259.5	$	440.5

^(a)  Credit facility has been amended to expire in October 2019.

^(b)  Includes outstanding commercial paper and letters of credit.

Money Pool

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Money pool borrowings for PSCo were as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2014			Twelve Months Ended Dec. 31, 2013
Borrowing limit	$	250		$	250
Amount outstanding at period end	11			—
Average amount outstanding	10			0.1
Maximum amount outstanding	97			12
Weighted average interest rate, computed on a daily basis	0.25		%	0.36		%
Weighted average interest rate at period end	0.24			N/A

Commercial Paper

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial paper outstanding for PSCo was as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2014			Twelve Months Ended Dec. 31, 2013
Borrowing limit	$	700		$	700
Amount outstanding at period end	253			—
Average amount outstanding	225			38
Maximum amount outstanding	315			332
Weighted average interest rate, computed on a daily basis	0.28		%	0.34		%
Weighted average interest rate at period end	0.28			N/A