Exhibit 12.01

EXHIBIT 12(a)

NORTHERN STATES POWER COMPANY — MINNESOTA
AND SUBSIDIARIES

COMPUTATION OF RATIO OF CONSOLIDATED EARNINGS
TO CONSOLIDATED FIXED CHARGES

(not covered by report of independent public accountants)

			Year Ended December 31,
			2001		2000		1999		1998		1997
			(in thousands, except ratios)
Earnings:
	Net income		$	207,865	$	111,224	$	158,980	$	210,206	$	199,465
	Provisions for Federal and state taxes on income			132,732		92,191		97,431		124,713		121,764
	Fixed charges as below			112,780		146,192		125,431		113,160		117,928
	Less: Undistributed equity in earnings of unconsolidated affiliates			—		—		—		—		—
		Total	$	453,377	$	349,607	$	381,842	$	448,079	$	439,157
Fixed Charges:
	Interest charges, excluding AFC — debt		$	97,030	$	130,442	$	109,681	$	97,410	$	103,490
	Distributions on redeemable preferred securities of subsidiary trust			15,750		15,750		15,750		15,750		14,438
		Total	$	112,780	$	146,192	$	125,431	$	113,160	$	117,928
Ratio of Earnings to Fixed Charges				4.0		2.4		3.0		4.0		3.7

Exhibit 12(b)

NORTHERN STATES POWER COMPANY — WISCONSIN

COMPUTATION OF RATIO OF EARNINGS
TO FIXED CHARGES

(not covered by report of independent public accountants)

			Year Ended December 31,
			2001		2000		1999		1998		1997
			(in thousands, except ratios)
Earnings:
	Net income		$	36,392	$	30,296	$	36,366	$	32,195	$	37,417
	Provisions for Federal and state taxes on income			21,158		20,690		25,302		20,468		23,309
	Fixed charges as below			23,139		21,557		19,627		19,189		18,010
	Less: Undistributed equity in earnings of unconsolidated affiliates			553		411		409		3		300
		Total	$	80,136	$	72,132	$	80,886	$	71,849	$	78,436
Fixed Charges:
	Interest charges, excluding AFC — debt		$	23,139	$	21,557	$	19,627	$	19,189	$	18,010
	Distributions on redeemable preferred securities of subsidiary trust			—		—		—		—		—
		Total	$	23,139	$	21,557	$	19,627	$	19,189	$	18,010
Ratio of Earnings to Fixed Charges				3.5		3.3		4.1		3.7		4.4

EXHIBIT 12(c)

PUBLIC SERVICE COMPANY OF COLORADO
AND SUBSIDIARIES

COMPUTATION OF RATIO OF CONSOLIDATED EARNINGS
TO CONSOLIDATED FIXED CHARGES

(not covered by report of independent public accountants)

			Year Ended December 31,
			2001		2000		1999		1998		1997
			(in thousands, except ratios)
Earnings:
	Net income		$	273,033	$	196,128	$	204,265	$	200,103	$	204,042
	Provisions for Federal and state taxes on income			132,501		102,770		96,574		101,494		90,813
	Fixed charges as below			226,651		244,952		234,544		210,539		197,658
	Less: Undistributed equity in earnings of unconsolidated affiliates			—		—		—		—		—
		Total	$	632,185	$	543,850	$	535,383	$	512,136	$	492,513
Fixed Charges:
	Interest charges, excluding AFC — debt		$	211,451	$	229,752	$	219,344	$	200,828	$	197,658
	Distributions on redeemable preferred securities of subsidiary trust			15,200		15,200		15,200		9,711		—
		Total	$	226,651	$	244,952	$	234,544	$	210,539	$	197,658
Ratio of Earnings to Fixed Charges				2.8		2.2		2.3		2.4		2.5

EXHIBIT 12(d)

SOUTHWESTERN PUBLIC SERVICE COMPANY
AND SUBSIDIARIES

COMPUTATION OF RATIO OF CONSOLIDATED EARNINGS
TO FIXED CHARGES

(not covered by report of independent public accountants)

			Year Ended December 31,
			2001		2000		1999		1998		1997
			(in thousands, except ratios)
Earnings:
	Net income		$	130,100	$	69,492	$	102,709	$	114,987	$	75,575
	Provisions for Federal and state taxes on income			71,175		58,776		59,399		65,696		48,795
	Fixed charges as below			57,276		67,713		64,888		64,052		63,075
	Less: Undistributed equity in earnings of unconsolidated affiliates			—		—		—		—		—
		Total	$	258,551	$	195,981	$	226,996	$	244,735	$	187,445
Fixed Charges:
	Interest charges, excluding AFC — debt		$	49,426	$	59,863	$	57,038	$	56,202	$	55,225
	Distributions on redeemable preferred securities of subsidiary trust			7,850		7,850		7,850		7,850		7,850
		Total	$	57,276	$	67,713	$	64,888	$	64,052	$	63,075
Ratio of Earnings to Fixed Charges				4.5		2.9		3.5		3.8		3.0