UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                    FORM 8-K


                                 CURRENT REPORT




     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934




                Date of report (Date of earliest event reported):
                                January 20, 1998





                     CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
             (Exact name of registrant as specified in its charter)




          Illinois                    1-3672                     37-0211380
(State or other jurisdiction       (Commission                (I.R.S. Employer
      of incorporation)            File Number)              Identification No.)





               607 East Adams Street, Springfield, Illinois 62739
              (Address of principal executive offices and Zip Code)






       Registrant's telephone number, including area code: (217) 523-3600









ITEM 5.           Other Events
                 --------------

     Reference  is  made to  Management's  Discussion  and  Analysis  under  the
captions "Electric Industry  Restructuring" and  "Contingencies" in Exhibit 99-2
of Form 8-K dated  December 31, 1997, to Form 8-K dated December 16, 1997 and to
Form 8-K dated November 24, 1997 filed by the Registrant with the Securities and
Exchange  Commission for discussion of the potential impact to the Registrant of
the Electric  Service  Customer  Choice and Rate Relief Law of 1997 (the "Act"),
which  provides  for utility  restructuring  in  Illinois,  and for  information
regarding the coal contract restructuring with a major coal supplier.

     In  December  1997,  the  governor  of Illinois  signed  electric  industry
restructuring  legislation  which introduces  competition for electric energy in
Illinois.  The  law  includes  a  5%  rate  decrease  for  electric  residential
customers,  beginning in August 1998. If the Registrant  does not keep its rates
below the Midwest  average,  the Registrant  would then be subject to additional
rate  decreases  in the  years  2000 and  2002.  The new law also  includes  the
phasing-in  of retail  direct  access,  which  allows  customers to choose their
electric generation supplier; the potential recovery of a portion of a utility's
stranded costs;  and the option to eliminate the fuel adjustment  clause,  among
other provisions.

     In a  related  matter,  in  November  1997,  the  Illinois  Third  District
Appellate  Court  reversed  a  December  1996  order  of the  Illinois  Commerce
Commission  ("ICC") related to the restructuring of a coal contract with a major
supplier.   That  ICC  order,   among  other  things,   allowed  recovery  of  a
restructuring  payment and asssociated carrying cost through the fuel adjustment
clause.  In December 1997,  the  Registrant  requested a rehearing by the Court;
which was ultimately  denied in January 1998.  The Registrant  expects to appeal
this decision to the Illinois Supreme Court.

     After  evaluating the impact of the new law, and taking into  consideration
the recent appelate court decisions,  the Registrant has determined that it will
be  necessary  to  write-off  its   generation-related   regulatory  assets  and
regulatory  liablilties in the fourth  quarter of 1997.  The Registrant  expects
this extraordinary  charge to reduce earnings  approximately $25 million, net of
income taxes.

     On January 20, 1998, Ameren Corporation ("Ameren"),  the parent corporation
of the  Registrant,  issued a news release  stating,  among other  things,  that
Ameren's  1998  earnings  would be lower  than  expected  1997  earnings,  after
excluding the effects of the  extraordinary  charge  discussed  above. A copy of
Ameren's  January 20, 1998 news release has been filed with the  Securities  and
Exchange  Commission  as Exhibit 99 to a Form 8-K of Ameren  dated  January  20,
1998,  and  the  contents  of such  news  release  are  incorporated  herein  by
reference. The lower 1998 earnings expected of Ameren result from lower expected
earnings at Ameren's  principal  operating  subsidiaries,  which  consist of the
Registrant and Union Electric  Company ("UE").  However,  the specific impact on
Ameren's  expected 1998 earnings  attributable to the Registrant,  as opposed to
UE, has not been fully determined at this time.

     Statements made in this filing which are not based on historical facts, are
forward-looking  and,  accordingly,  involve risks and uncertainties  that could
cause actual results to differ  materially from those  discussed.  Although such
forward-looking  statements  have  been  made in good  faith  and are  based  on
reasonable assumptions,  there is no assurance that the expected results will be
achieved.  These statements include (without limitation) statements as to future
expectations,  beliefs, plans, strategies,  objectives,  events, conditions, and
financial  performance.  In  connection  with "Safe  harbor"  provisions  of the
Private  Securities  Litigation  Reform Act of 1995, the Registrant is providing
this cautionary  statement to identify important factors that could cause actual
results to differ materially from those  anticipated.  Factors include,  but are
not  limited to, the effects of  regulatory  actions;  changes in laws and other
governmental actions; competition; future market prices for electricity; average
rates for electricity in the Midwest; business and economic conditions;  weather
conditions; fuel prices and availability; generation plant performance; monetary
and fiscal policies; and legal and administrative proceedings.


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                                    SIGNATURE

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                                       CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
                                                     (Registrant)


                                            By  /s/ James C. Thompson
                                              --------------------------
                                                    James C. Thompson
                                                    Assistant Secretary

Date:  January 20, 1998

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