Ameren Illinois (AILIN) 8-K Other Events

Exhibit 12.2

CILCORP INC. Computation of Ratio of Earnings to Fixed Charges (Thousands of Dollars, Except Ratios)
	Three Months Ended March 31, 2006
Net income from continuing operations	$	7,898
Add- Taxes based on income		2,963
Net income before income taxes		10,861
Add- fixed charges:
Interest on long term debt		12,591
Estimated interest cost within rental expense		64
Amortization of net debt premium, discount, and expenses		133
Subsidiary preferred stock dividends		491
Adjust preferred stock dividends to pre-tax basis		249
Total fixed charges		13,528
Less: Adjustment of preferred stock dividends to pre-tax basis		249
Earnings available for fixed charges		24,140
Ratio of earnings to fixed charges		1.78