Exhibit 12.B

COLORADO INTERSTATE GAS COMPANY
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
(DOLLARS IN MILLIONS)

	For the Years ended December 31,
	2008			2007			2006		2005			2004
Earnings
Pre-tax income from continuing operations	$	149		$	151		$	139	$	108		$	108
Income from equity investee		(3	)		(2	)		—		—			—
Pre-tax income from continuing operations before income from equity investee		146			149			139		108			108
Fixed charges		42			61			51		38			30
Distributed income of equity investee		1			—			—		—			—
Capitalized interest		(2	)		(1	)		—		(1	)		—
Total earnings available for fixed charges	$	187		$	209		$	190	$	145		$	138
Fixed charges
Interest and debt expense	$	41		$	60		$	50	$	37		$	29
Interest component of rent		1			1			1		1			1
Total fixed charges	$	42		$	61		$	51	$	38		$	30
Ratio of earnings to fixed charges		4.5			3.4			3.7		3.8			4.6

     For purposes of computing these ratios, earnings means pre-tax income from continuing operations before:

• income from equity investee, adjusted to reflect actual distributions from equity investments; and

• fixed charges;

     less:

• capitalized interest.

     Fixed charges means the sum of the following:

• interest costs, not including interest on tax liabilities which is included in income tax expense our income statement;

• amortization of debt costs; and

• that portion of rental expense which we believe represents an interest factor.