Exhibit 12

Williams Partners L.P.

Computation of Ratio of Earnings to Fixed Charges

	Years Ended December 31,
	2011			2010			2009			2008			2007
	(Millions)
Earnings:
Income before income taxes	$	1,381		$	1,103		$	1,040		$	1,156		$	1,318
Less: Equity earnings, excluding proportionate share from 50% owned investees and unconsolidated majority-owned investees		(93	)		(68	)		(55	)		(55	)		(51	)
Income before income taxes and equity earnings		1,288			1,035			985			1,101			1,267
Add:
Fixed charges:
Interest accrued, including proportionate share from 50% owned investees and unconsolidated majority-owned investees		426			393			260			252			226
Rental expense representative of interest factor		7			6			8			11			13
Total fixed charges		433			399			268			263			239
Distributed income of equity-method investees, excluding proportionate share from 50% owned investees and unconsolidated majority-owned investees		101			78			60			64			48
Less:
Capitalized interest		(11	)		(29	)		(58	)		(43	)		(25	)
Total earnings as adjusted	$	1,811		$	1,483		$	1,255		$	1,385		$	1,529
Fixed charges	$	433		$	399		$	268		$	263		$	239
Ratio of earnings to fixed charges		4.18			3.72			4.68			5.27			6.40