Market Alerts

IL – Ameren Issue Around The 867MU EDI Transaction

Published November 25, 2025

Category: Illinois
Related Categories: Ameren Illinois, Electronic Data Exchange - EDI, Market Alert

It has been brought to Ameren’s attention that we are incorrectly using “AA” in the MEA01 of the 867MU when the MEA follows QTY*QE.  We should instead be using “AF”.  Ameren plans to make a fix for this effective next Tuesday, 12-02-25.

The screenshot below shows the change.: 

PATRICK EYNON : : Manager, Transmission Services Business Center : : 314.554.4110
Ameren Services : : 1901 Chouteau : : Mailcode 410 : : St. Louis, MO 63103

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