Company: AILIM
Filing Date: 2025-09-16
Form Type: 424B2
Source: 0001104659-25-090464
Chunk: 11

Company: Ameren Illinois Co
Filing Date: 2025-09-16
Form: 424B2
Chunk 11
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 of the close of business on the relevant record date according to the bonds and the mortgage indenture.

We will send notice of any redemption at least 10 days but not more than 60 days before the redemption date to each holder of the bonds to be redeemed, and, if less than all bonds are to be redeemed, the particular bonds to be redeemed will be selected by the mortgage trustee by lot; provided that as long as the bonds are represented by global certificates registered in the name of DTC, or its nominee, beneficial interests in such global certificates will be selected for redemption by DTC in accordance with its standard procedures therefor.

Any notice of redemption at our option may state that such redemption will be conditional upon receipt by the mortgage trustee, on or prior to the date fixed for such redemption, of money sufficient to pay the principal of, premium, if any, and interest on such bonds, and that if such money has not been so received, such notice will be of no force and effect and we will not be required to redeem such bonds. Unless we default in payment of the redemption price, on and after the redemption date, interest will cease to accrue on the bonds or portions thereof called for redemption.

#### Ranking
The bonds will rank equally with all of our other current and future secured debt that is directly or indirectly secured by the lien of the mortgage indenture, will be effectively senior to our unsecured and unsubordinated debt and will rank senior in right of payment to our subordinated debt, if any. See “Description of First Mortgage Bonds and Mortgage Indenture — Priority and Security” in the accompanying prospectus. As of June 30, 2025, we had approximately $6.0 billion in principal amount of first mortgage bonds outstanding (a portion of which secured outstanding senior secured debt securities) and approximately $245 million in principal amount of unsecured and unsubordinated short-term debt outstanding. As of June 30, 2025, we could have issued under the mortgage indenture approximately $8.2 billion of additional first mortgage bonds based on unfunded property additions (as defined in the accompanying prospectus) and approximately $1.1 billion of additional first mortgage bonds based on retired first mortgage bonds. See “Description of Senior Secured Debt Securities — General” in the accompanying prospectus for a description of the senior secured debt securities.

#### Global Securities and Book-Entry System
The bonds will be in book-entry form, will be represented by one or more permanent global certificates in fully registered form without interest