Exhibit 12.1

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

	Year Ended December 31,
	2002			2003			2004			2005			2006
Net income from continuing operations	$	382,065		$	524,145		$	529,884		$	605,725		$	546,738
Less- Change in accounting principle		—			18,416			—			(22,135	)		—
Less- Minority interest		(13,627	)		(7,050	)		(4,201	)		(3,231	)		(27,135	)
Add- Taxes based on income		236,320			301,209			282,558			356,016			283,825
Net income before income taxes, change in accounting principle and minority interest		632,012			813,988			816,643			987,107			857,698
Add- fixed charges:
Interest on long term debt		210,481			271,525			269,868			297,822			345,410
Estimated interest cost within rental expense		2,852			4,169			3,185			4,208			4,081
Amortization of net debt premium, discount, and expenses		8,260			10,210			12,983			14,687			15,341
Subsidiary preferred stock dividends		10,841			10,861			11,089			12,745			10,936
Adjust preferred stock dividends to pre-tax basis		6,706			6,469			5,913			7,227			5,565
Total fixed charges		239,140			303,234			303,038			336,689			381,333
Less: Adjustment of preferred stock dividends to pre-tax basis		6,706			6,469			5,913			7,227			5,565
Earnings available for fixed charges	$	864,446		$	1,110,753		$	1,113,768		$	1,316,569		$	1,233,466
Ratio of earnings to fixed charges		3.61			3.66			3.67			3.91			3.23