Exhibit 12

Williams Partners L.P.
Computation of Ratio of Earnings to Fixed Charges

	Years Ended December 31,
	2004		2005		2006		2007		2008
	(Dollars in thousands)
Earnings:
Income	$	119,901	$	163,778	$	214,575	$	164,631	$	191,389
Less:
Equity earnings — Wamsutter		39,016		40,555		61,690		76,212		88,538
Equity earnings — Discovery Producer Services		5,619		11,880		18,050		28,842		20,641
Income before equity earnings		75,266		111,343		134,835		59,577		82,210
Add:
Fixed charges:
Interest accrued		12,476		8,238		9,833		58,348		67,220
Rental expense representative of interest factor		1,924		2,457		2,522		2,756		2,684
Total fixed charges		14,400		10,695		12,355		61,104		69,904
Distributed income of equity-method investees		—		1,280		16,400		26,469		155,539
Total earnings as adjusted	$	89,666	$	123,318	$	163,590	$	147,150	$	307,653
Fixed charges		14,400		10,695		12,355		61,104		69,904
Ratio of earnings to fixed charges		6.23		11.53		13.24		2.41		4.40