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)

	Nine Months Ended September 30, 2011		Year Ended       December 31,       2010
Net income from continuing operations	$	170,019	$	212,547
Add- Taxes based on income		111,264		136,614
Net income before income taxes		281,283		349,161
Add- fixed charges:
Interest on short-term and long-term debt (a)		100,188		152,667
Estimated interest cost within rental expense		2,717		3,899
Amortization of net debt premium, discount, and expenses		3,947		5,250
Total fixed charges		106,852		161,816
Earnings available for fixed charges		388,135		510,977
Ratio of earnings to fixed charges		3.63		3.15
Earnings required for combined fixed charges and preferred stock dividends:
Preferred stock dividends		2,267		4,435
Adjustment to pretax basis		1,484		2,396
		3,751		6,831
Combined fixed charges and preferred stock dividend requirements	$	110,603	$	168,647
Ratio of earnings to combined fixed charges and preferred stock dividend requirements		3.51		3.02

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