Exhibit 12.3

Central Illinois Public Service Company

Computation of Ratios of Earnings to Fixed Charges and Combined

Fixed Charges and Preferred Stock Dividend Requirements

(Thousands of Dollars, Except Ratios)

	Year Ended December 31,
	2001		2002		2003		2004		2005
Net income from continuing operations	$	45,309	$	26,355	$	28,474	$	32,463	$	42,998
Less- Change in accounting principle		-		-		-		-		-
Less- Income from equity investee		-		-		-		-		-
Add- Taxes based on income		28,245		16,955		6,245		16,135		24,596
Net income before income taxes		73,554		43,310		34,719		48,598		67,594
Add- fixed charges:
Interest on long term debt		38,273		39,603		33,118		31,372		28,969
Estimated interest cost within rental expense
Amortization of net debt premium, discount, and expenses		993		1,076		935		903		953
Total fixed charges		39,266		40,679		34,053		32,275		29,922
Earnings available for fixed charges		112,820		83,989		68,772		80,873		97,516
Ratio of earnings to fixed charges		2.87		2.06		2.01		2.50		3.25
Earnings required for combined fixed charges and preferred stock dividends:
Preferred stock dividends		3,627		3,158		2,973		2,512		2,512
Adjustment to pre-tax basis		2,260		2,031		651		1,248		1,437
		5,887		5,189		3,624		3,760		3,949
Combined fixed charges and preferred stock dividend requirements	$	45,153	$	45,868	$	37,677	$	36,035	$	33,871
Ratio of earnings to combined fixed charges and preferred stock dividend requirements		2.49		1.83		1.82		2.24		2.87