Exhibit 12.1

Ameren Corporation Computation of Ratio of Earnings to Fixed Charges (Thousands of Dollars, Except Ratios)
	6 Months Ended			Year Ended
	June 30,			December 31,
	2008			2007
Net income from continuing operations	$	343,727		$	617,804
Less- Change in accounting principle		-			-
Less- Minority interest		(16,309	)		(27,266	)
Add- Taxes based on income		205,718			330,141
Net income before income taxes, change in accounting principle, and minority interest		565,754			975,211
Add- fixed charges:
Interest on long term debt (1)		216,832			421,406
Estimated interest cost within rental expense		3,153			5,020
Amortization of net debt premium, discount,      and expenses		9,275			18,638
Subsidiary preferred stock dividends		5,420			10,871
Adjust preferred stock dividends to pre-tax basis		3,193			5,709
Total fixed charges		237,873			461,644
Less: Adjustment of preferred stock dividends to pre-tax basis		3,193			5,709
Earnings available for fixed charges	$	800,434		$	1,431,146
Ratio of earnings to fixed charges		3.36			3.10
(1)  Includes FIN 48 interest expense