A Bidder may, in its Part 1 Proposal, provide comments or propose modifications only to the CHANGES that have been made to the Standard Pre-Bid Letters of Credit for ComEd and for Ameren relative to the previously used Pre-Bid Letters of Credit for each Company. Ameren has not made any changes to the Letters of Credit; no modifications may be proposed to the Ameren Letter of Credit.

However, please note that Ameren accepts a number of modifications on an optional basis. Such modifications are provided in the document entitled “Acceptable Modifications to the Standard Pre-Bid Letter of Credit for Ameren”, which is posted immediately underneath the Standard Pre-Bid Letter of Credit for Ameren (Appendix 7 to the RFP Rules on the Standard Products page). Please consult this document to determine whether any changes that are proposed by your financial institution are acceptable to Ameren.