Exhibit 12.01

PSCo

STATEMENT OF COMPUTATION OF

RATIO OF EARNINGS TO FIXED CHARGES

Thousands of Dollars

	Six
	Months Ended
	June 30,		Year Ended December 31,
	2007		2006		2005		2004		2003		2002
Earnings as defined:
Pretax income from continuing operations	$	230,747	$	346,938	$	302,104	$	307,869	$	329,347	$	404,729
Add:
Fixed charges	71,410		147,061		155,731		168,115		180,700		162,982
Earnings as defined	302,157		493,999		457,835		475,984		510,047		567,711
Fixed charges:
Interest charges	71,410		147,061		155,731		168,115		173,328		148,238
Preference security dividend requirements of consolidated subsidiaries	—		—		—		—		7,372		14,744
Total fixed charges	$	71,410	$	147,061	$	155,731	$	168,115	$	180,700	$	162,982
Ratio of earnings to fixed charges	4.2		3.4		2.9		2.8		2.8		3.5