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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 OgqMxRsonrC4wjeSf58XKP01q+bjwrfn318Q/95JEDFioHOZACecvBOHCC7fSI9w
 zFyySgu/Euco/5U8O71ljg==

<SEC-DOCUMENT>9999999995-08-001729.txt : 20080530
<SEC-HEADER>9999999995-08-001729.hdr.sgml : 20080530
<ACCEPTANCE-DATETIME>20080530001518
ACCESSION NUMBER:		9999999995-08-001729
CONFORMED SUBMISSION TYPE:	EFFECT
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20080529
DATE AS OF CHANGE:		20080530
EFFECTIVENESS DATE:		20080529

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ILLINOIS POWER CO
		CENTRAL INDEX KEY:			0000049816
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
		IRS NUMBER:				370344645
		STATE OF INCORPORATION:			IL
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		EFFECT
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-150973
		FILM NUMBER:		08868337

	BUSINESS ADDRESS:	
		STREET 1:		500 S 27TH ST
		STREET 2:		C/O HARRIS TRUST & SAVINGS BANK
		CITY:			DECATUR
		STATE:			IL
		ZIP:			62525-1805
		BUSINESS PHONE:		2174246600

	MAIL ADDRESS:	
		STREET 1:		500 SOUTH 27TH STREET
		CITY:			DECATUR
		STATE:			IL
		ZIP:			62521

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ILLINOIS IOWA POWER CO
		DATE OF NAME CHANGE:	19660822
</SEC-HEADER>
<DOCUMENT>
<TYPE>EFFECT
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0101</schemaVersion>

    <submissionType>EFFECT</submissionType>

    <act>33</act>

    <testOrLive>LIVE</testOrLive>

    <effectiveData>
        <finalEffectivenessDispDate>2008-05-29</finalEffectivenessDispDate>
        <finalEffectivenessDispTime>10:00:00</finalEffectivenessDispTime>
        <form>S-4</form>
        <filer>
            <cik>0000049816</cik>
            <entityName>ILLINOIS POWER CO</entityName>
            <fileNumber>333-150973</fileNumber>
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</TEXT>
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