EXHIBIT 12.1

WESTERN GAS PARTNERS, LP

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year Ended December 31,
thousands	2012		2011		2010		2009		2008
Earnings:
Income before income taxes	$	170,026	$	239,011	$	178,450	$	148,520	$	205,132
Add:
Fixed charges		48,422		30,993		19,292		10,992		2,965
Distributions from equity investees		20,660		15,999		10,973		11,206		14,428
Amortization of capitalized interest		479		294		256		182		80
Less:
Equity income		16,111		11,261		7,628		7,923		11,118
Capitalized interest		6,196		420		—		—		—
Net income before taxes attributable to noncontrolling interests		14,890		14,103		11,005		10,260		7,965
Earnings	$	202,390	$	260,513	$	190,338	$	152,717	$	203,522
Fixed charges:
Interest expense, including capitalized interest	$	48,256	$	30,765	$	18,794	$	9,955	$	364
Interest component of rent expense		166		228		498		1,037		2,601
Fixed charges	$	48,422	$	30,993	$	19,292	$	10,992	$	2,965
Ratio of earnings to fixed charges		4.2x		8.4x		9.9x		13.9x		68.6x

These ratios were computed by dividing earnings by fixed charges. For this purpose, earnings include pre-tax income, 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.