Exhibit 12.3

Ameren Illinois 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, 2011		Year Ended December 31, 2010
Net income from continuing operations	$	33,350	$	212,547
Add- Taxes based on income		19,814		136,614
Net income before income taxes		53,164		349,161
Add- fixed charges:
Interest on short-term and long-term debt (a)		34,214		152,667
Estimated interest cost within rental expense		893		3,899
Amortization of net debt premium, discount, and expenses		1,330		5,250
Total fixed charges		36,437		161,816
Earnings available for fixed charges		89,601		510,977
Ratio of earnings to fixed charges		2.46		3.15
Earnings required for combined fixed charges and preferred stock dividends:
Preferred stock dividends		756		4,435
Adjustment to pretax basis		449		2,396
		1,205		6,831
Combined fixed charges and preferred stock dividend requirements	$	37,642	$	168,647
Ratio of earnings to combined fixed charges and preferred stock dividend requirements		2.38		3.02

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