EXHIBIT 12

GAS TRANSMISSION NORTHWEST CORPORATION

EXHIBIT 12 - RATIO OF EARNINGS TO FIXED CHARGES

(In millions, except ratios)

	Nine Months Ended
Ratio of Earnings to Fixed Charges	September 30, 2004			September 30, 2003
Earnings:
Net income (loss)	$	(4.5	)	$	40.2
Adjustments:
Income taxes		(2.3	)		26.1
Fixed charges (as below)		29.2			30.1
Total adjusted earnings	$	22.4		$	96.4
Fixed charges:
Net interest expense	$	28.6		$	29.5
Adjustments:
Interest component of rents		0.2			0.3
AFUDC debt		0.4			0.3
Total fixed charges	$	29.2		$	30.1
Ratio of earnings to fixed charges		0.8			3.2
Dollar amount of deficiency	$	6.8			—