Ameren Illinois (AILLI) 10-K 2004 FY Annual report

 Exhibit 12.1

Ameren Corporation Computation Of Earnings To Fixed Charges (Thousands of Dollars)
	Year Ended December 31,
	2000			2001			2002			2003			2004
Net income from continuing operations	$	457,094		$	475,386		$	382,065		$	505,729		$	529,884
Income taxes		298,623			305,667			236,320			301,209			282,558
Fixed charges		204,631			222,671			239,140			303,234			303,038
Less:
Preference security dividend requirements of consolidated subsidiaries		(20,997	)		(20,447	)		(17,547	)		(17,330	)		(17,002	)
Total earnings	$	939,351		$	983,277		$	839,978		$	1,092,842		$	1,098,478
Fixed Charges:
Interest expense		179,706			198,648			218,741			281,735			282,851
Estimated interest cost within rental expense		3,928			3,576			2,852			4,169			3,185
Earnings required for preferred dividends:
Preference dividends of consolidated subsidiaries		12,700			12,445			10,841			10,861			11,089
Adjustment to pre-tax basis		8,297			8,002			6,706			6,469			5,913
		20,997			20,447			17,547			17,330			17,002
Total fixed charges	$	204,631		$	222,671		$	239,140		$	303,234		$	303,038
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Ratio of Earnings to Fixed Charges		4.59			4.42			3.51			3.60			3.62