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| 9/10/2010 | IG | Moody's affirms Central Illinois Public Service |
| 4/15/2010 | IG | Ameren Illinois to issue new preferreds for six series of Illinois Power preferreds due to merger |
| 3/15/2010 | IG | AmerenCIPS likely to redeem preferreds, 7.61% bonds with merger |
| 8/13/2009 | IG | Moody's affirms Ameren, ups Central Illinois |
| 10/16/2008 | IG | Fitch ups Ameren subsidiaries from junk |
| 9/11/2008 | BKHYIG | S&P ups Ameren subsidiaries from junk |
| 5/21/2008 | IG | Moody's cuts Union Electric, puts Ameren on review |
| 2/12/2008 | IG | Moody's may cut Union Electric |
| 8/29/2007 | HYIG | Moody's confirms Ameren |