PR-10-123 -- HEARING DATE CHANGED Mexico Local Public Hearing To Be Held On February 1 In AmerenUE Electric Rate Case

Contact: Kevin Kelly (573) 751-9300

FOR IMMEDIATE RELEASE -- JANUARY 15, 2010

JEFFERSON CITY---Due to a scheduling conflict with another event at Mexico High
School, a Missouri Public Service Commission local public hearing scheduled for January 28, 2010
will now be held on February 1, 2010.

The Missouri Public Service Commission will hold a local public hearing in Mexico on
February 1, 2010, to receive customer comment in an electric rate case filed by Union Electric
Company d/b/a AmerenUE. Customers who have had any service related problems may also bring
those to the attention of the Commission during the local public hearing.

The February 1, 2010, local public hearing will be held at Mexico High School-Emmons Hall-639 North Wade. A question and answer session starts at 5:30 p.m. The local public hearing
will be held from 6:00 p.m. until 9:00 p.m. or until all those who wish to testify have done so, whichever is sooner.

This local public hearing will be held in a facility that meets the accessibility requirements of
the Americans with Disabilities Act. Any person who needs additional accommodations to
participate in this hearing should call the Public Service Commission’s hotline at 1-800-392-4211
(voice) or Relay Missouri at 711 before the hearing.

Consumers unable to attend the local public hearing and wish to make written comments may contact the Office of the Public Counsel, P.O. Box 2230, Jefferson City, Missouri 65102-2230, telephone (866) 922-2959, e-mail opcservice@ded.mo.gov or the Missouri Public Service Commission, P.O. Box 360, Jefferson City, Missouri 65102, telephone 1-800-392-4211, e-mail pscinfo@psc.mo.gov.  Comments may also be registered in the case using the Commission’s electronic filing system at https://www.efis.psc.mo.gov/mpsc/Comments.html.

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Case No. ER-2010-0036