Exhibit 12

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

	Years Ended December 31,
	2005		2006		2007		2008		2009
	(Dollars in thousands)
Earnings:
Income	$	163,778	$	214,575	$	164,631	$	191,389	$	152,467
Less:
Equity earnings — Wamsutter		40,555		61,690		76,212		88,538		84,052
Equity earnings — Discovery Producer Services		11,880		18,050		28,842		20,641		23,023
Income before equity earnings		111,343		134,835		59,577		82,210		45,392
Add:
Fixed charges:
Interest accrued		8,238		9,833		58,348		67,220		60,679
Rental expense representative of interest factor		2,457		2,522		2,756		2,684		2,379
Total fixed charges		10,695		12,355		61,104		69,904		63,058
Distributed income of equity-method investees		1,280		16,400		26,469		155,539		122,365
Total earnings as adjusted	$	123,318	$	163,590	$	147,150	$	307,653	$	230,815
Fixed charges		10,695		12,355		61,104		69,904		63,058
Ratio of earnings to fixed charges		11.53		13.24		2.41		4.40		3.66