EXHIBIT 12.1

WESTERN GAS PARTNERS, LP

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year Ended December 31,
thousands	2011		2010		2009		2008		2007
Earnings:
Income before income taxes	$	207,364	$	178,899	$	148,654	$	205,136	$	178,741
Add:
Fixed charges		30,573		19,292		10,992		2,965		8,783
Distributions from equity investees		15,999		10,973		11,206		14,428		8,349
Amortization of capitalized interest		234		50		298		86		—
Less:
Equity income		11,261		7,628		7,923		11,118		10,145
Net income before taxes attributable to noncontrolling interests		14,103		11,005		10,260		7,965		—
Earnings	$	228,806	$	190,581	$	152,967	$	203,532	$	185,728
Fixed charges:
Interest expense	$	30,345	$	18,794	$	9,955	$	364	$	4,965
Interest component of lease expense		228		498		1,037		2,601		3,818
Fixed charges	$	30,573	$	19,292	$	10,992	$	2,965	$	8,783
Ratio of earnings to fixed charges		7.5x		9.9x		13.9x		68.6x		21.1x

These ratios were computed by dividing earnings by fixed charges. For this purpose, earnings include pre-tax income before adjustment for income or loss from equity investees, plus fixed charges to the extent they affect current year earnings, amortization of capitalized interest and distributed income of equity investees, then subtracting equity income, noncontrolling interests in pre-tax income from subsidiaries that did not incur fixed charges, and interest capitalized during the year. Fixed charges include interest expensed and capitalized, amortized premiums, discounts and capitalized expenses related to indebtedness, and estimates of interest within rental expenses.