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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 PfRP9siVy1jS0r4I0wRWRLontuhh89cIX1aLOXtD3cRBFkYqOo41urK/G+PSMhM3
 d5TK9+wchH6xnHMHpHVSWQ==

<SEC-DOCUMENT>9999999995-10-002076.txt : 20100709
<SEC-HEADER>9999999995-10-002076.hdr.sgml : 20100709
<ACCEPTANCE-DATETIME>20100709001510
ACCESSION NUMBER:		9999999995-10-002076
CONFORMED SUBMISSION TYPE:	EFFECT
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20100708
DATE AS OF CHANGE:		20100709
EFFECTIVENESS DATE:		20100708

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CENTRAL ILLINOIS PUBLIC SERVICE CO
		CENTRAL INDEX KEY:			0000018654
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
		IRS NUMBER:				370211380
		STATE OF INCORPORATION:			IL
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		EFFECT
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-166095
		FILM NUMBER:		10945266

	BUSINESS ADDRESS:	
		STREET 1:		607 E ADAMS ST
		CITY:			SPRINGFIELD
		STATE:			IL
		ZIP:			62739
		BUSINESS PHONE:		217-523-3600

	MAIL ADDRESS:	
		STREET 1:		CENTRAL ILLINOIS PUBLIC SERVICE CO
		STREET 2:		607 E ADAMS ST
		CITY:			SPRINGFIELD
		STATE:			IL
		ZIP:			62739
</SEC-HEADER>
<DOCUMENT>
<TYPE>EFFECT
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0101</schemaVersion>

    <submissionType>EFFECT</submissionType>

    <act>33</act>

    <testOrLive>LIVE</testOrLive>

    <effectiveData>
        <finalEffectivenessDispDate>2010-07-08</finalEffectivenessDispDate>
        <finalEffectivenessDispTime>09:30:00</finalEffectivenessDispTime>
        <form>S-4</form>
        <filer>
            <cik>0000018654</cik>
            <entityName>CENTRAL ILLINOIS PUBLIC SERVICE CO</entityName>
            <fileNumber>333-166095</fileNumber>
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</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
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