Exhibit 12.1

Ameren Corporation
Computation of Ratio of Earnings to Fixed Charges
(Thousands of Dollars, Except Ratios)

	Year Ended December 31,
	2003			2004			2005			2006			2007
Net income from continuing operations	$	524,145		$	529,884		$	605,725		$	546,738		$	617,804
Less - Change in accounting principle		18,416			-			(22,135	)		-		-
Less - Minority interest		(7,050	)		(4,201	)		(3,231	)		(27,135	)		(27,266	)
Add - Taxes based on income		301,209			282,558			356,016			283,825			330,141
Net income before income taxes, change in accounting principle and minority interest		813,988			816,643			987,107			857,698			975,211
Add - fixed charges:
Interest on long term debt		271,525			269,868			297,822			345,410			421,406	(1)
Estimated interest cost within rental expense		4,169			3,185			4,208			4,081			5,020
Amortization of net debt premium, discount, and expenses		10,210			12,983			14,687			15,341			18,638
Subsidiary preferred stock dividends		10,861			11,089			12,745			10,936			10,871
Adjust preferred stock dividends to pretax basis		6,469			5,913			7,227			5,565			5,709
Total fixed charges		303,234			303,038			336,689			381,333			461,644
Less: Adjustment of preferred stock dividends to pretax basis		6,469			5,913			7,227			5,565			5,709
Earnings available for fixed charges	$	1,110,753		$	1,113,768		$	1,316,569		$	1,233,466		$	1,431,146
Ratio of earnings to fixed charges		3.66			3.67			3.91			3.23			3.10

⁽¹⁾ Includes FIN 48 interest expense