Exhibit 12.1

Ameren Corporation

Computation of Ratio of Earnings to Fixed Charges

(Thousands of Dollars, Except Ratios)

	Year Ended December 31,
	2001			2002			2003			2004			2005
Net income from continuing operations	$	468,545		$	382,065		$	524,145		$	529,884		$	605,725
Less- Change in accounting principle		(6,841	)		-			18,416			-			(22,135	)
Less- Minority interest		(4,252	)		(13,627	)		(7,050	)		(4,201	)		(3,231	)
Add- Taxes based on income		305,667			236,320			301,209			282,558			356,016
Net income before income taxes, change in accounting principle and minority interest		785,305			632,012			813,988			816,643			987,107
Add- fixed charges:
Interest on long term debt		193,163			210,481			271,525			269,868			297,822
Estimated interest cost within rental expense		3,576			2,852			4,169			3,185			4,208
Amortization of net debt premium, discount, and expenses		5,485			8,260			10,210			12,983			14,687
Subsidiary preferred stock dividends		12,445			10,841			10,861			11,089			12,745
Adjust preferred stock dividends to pre-tax basis		8,002			6,706			6,469			5,913			7,227
Total fixed charges		222,671			239,140			303,234			303,038			336,689
Less: Adjustment of preferred stock dividends to pre-tax basis		8,002			6,706			6,469			5,913			7,227
Earnings available for fixed charges		999,974			864,446			1,110,753			1,113,768			1,316,569
Ratio of earnings to fixed charges		4.49			3.61			3.66			3.67			3.91