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,
	2002		2003		2004		2005		2006
Net income from continuing operations	$	26,355	$	28,474	$	32,463	$	42,998	$	37,372
Add- Taxes based on income		16,955		6,245		16,135		24,596		15,539
Net income before income taxes		43,310		34,719		48,598		67,594		52,911
Add- fixed charges:
Interest on long term debt		39,603		33,118		31,372		28,969		29,932
Estimated interest cost within rental expense		—		—		—		—		726
Amortization of net debt premium, discount, and expenses		1,076		935		903		953		1,025
Total fixed charges		40,679		34,053		32,275		29,922		31,683
Earnings available for fixed charges		83,989		68,772		80,873		97,516		84,594
Ratio of earnings to fixed charges		2.06		2.01		2.50		3.25		2.67
Earnings required for combined fixed charges and preferred stock dividends:
Preferred stock dividends		3,158		2,973		2,512		2,512		2,512
Adjustment to pre-tax basis		2,031		651		1,248		1,437		1,045
		5,189		3,624		3,760		3,949		3,557
Combined fixed charges and preferred stock dividend requirements	$	45,868	$	37,677	$	36,035	$	33,871	$	35,240
Ratio of earnings to combined fixed charges and preferred stock dividend requirements		1.83		1.82		2.24		2.87		2.40