Exhibit 12.7

Illinois Power 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 (1)		2005		2006
Net income from continuing operations	$	162,989	$	117,113		$	137,538	$	97,039	$	56,659
Less- Change in accounting principle		—		(2,294	)		—		—		—
Less- Income from equity investee		—		—			—		—		—
Add- Taxes based on income		104,209		76,023			87,591		65,171		37,246
Net income before income taxes and change in accounting principle		267,198		195,430			225,129		162,210		93,905
Add- fixed charges:
Interest on long term debt		94,738		146,045			112,616		41,028		46,167
Estimated interest cost within rental expense		2,442		1,895			1,696		1,290		205
Amortization of net debt premium, discount, expenses and losses		18,135		17,751			18,772		2,315		3,537
Total fixed charges		115,315		165,691			133,084		44,633		49,909
Earnings available for fixed charges		382,513		361,121			358,213		206,843		143,814
Ratio of earnings to fixed charges		3.31		2.17			2.69		4.63		2.88
Earnings required for combined fixed charges and preferred stock dividends:
Preferred stock dividends		2,294		2,294			2,294		2,294		2,294
Adjustment to pre-tax basis		1,466		1,434			1,461		1,542		1,508
		3,760		3,728			3,755		3,836		3,802
Combined fixed charges and preferred stock dividend requirements	$	119,075	$	169,419		$	136,839	$	48,469	$	53,711
Ratio of earnings to combined fixed charges and preferred stock dividend requirements		3.21		2.13			2.61		4.26		2.67

⁽¹⁾ Ameren Corporation purchased Illinois Power Company on September 30, 2004, amounts include combined predecessor and successor financial information.