MDU RESOURCES GROUP, INC.

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

AND COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS

	Twelve Months  Ended March 31, 2008			Year Ended December 31, 2007
	(In thousands of dollars)
Earnings Available for Fixed Charges:
Net Income (a)	$	335,837		$	308,288
Income Taxes		207,706			190,024
		543,543			498,312
Rents (b)		11,647			11,947
Interest (c)		77,983			76,248
Total Earnings Available for Fixed Charges	$	633,173		$	586,507
Preferred Dividend Requirements	$	685		$	685
Ratio of Income Before Income Taxes to Net Income		159	%		159	%
Preferred Dividend Factor on Pretax Basis		1,089			1,089
Fixed Charges (d)		91,945			90,545
Combined Fixed Charges and Preferred Stock Dividends	$	93,034		$	91,634
Ratio of Earnings to Fixed Charges		6.9	x		6.5	x
Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends		6.8	x		6.4	x

(a)   Net income excludes undistributed income for equity investees.

(b)   Represents interest portion of rents estimated at 33 1/3%.

(c)   Represents interest, amortization of debt discount and expense on all indebtedness and amortization of interest capitalized, and excludes amortization of gains or losses on reacquired debt (which, under the Federal Energy Regulatory Commission Uniform System of Accounts, is classified as a reduction of, or increase in, interest expense in the Consolidated Statements of Income) and interest capitalized.

(d)   Represents rents (as defined above), interest, amortization of debt discount and expense on all indebtedness, and excludes amortization of gains or losses on reacquired debt (which, under the Federal Energy Regulatory Commission Uniform System of Accounts, is classified as a reduction of, or increase in, interest expense in the Consolidated Statements of Income).