Exhibit 12.3

Central Illinois Public Service Company

Computation of Ratio of Earnings to Fixed Charges and Combined

Fixed Charges and Preferred Stock Dividend Requirements

(Thousands of Dollars, Except Ratios)

	Three Months Ended March  31, 2010		Year Ended         December 31,        2009
Net income from continuing operations	$	9,291	$	28,897
Add- Taxes based on income		7,343		16,265
Net income before income taxes		16,634		45,162
Add- fixed charges:
Interest on short-term and long-term debt (a)		7,172		28,315
Estimated interest cost within rental expense		299		1,216
Amortization of net debt premium, discount, and expenses		189		881
Total fixed charges		7,660		30,412
Earnings available for fixed charges		24,294		75,574
Ratio of earnings to fixed charges		3.17		2.48
Earnings required for combined fixed charges and preferred stock dividends:
Preferred stock dividends		628		2,512
Adjustment to pretax basis		496		1,414
		1,124		3,926
Combined fixed charges and preferred stock dividend requirements	$	8,784	$	34,338
Ratio of earnings to combined fixed charges and preferred stock dividend requirements		2.76		2.20

^(a) Includes interest expense related to uncertain tax positions.