SECURITIES AND EXCHANGE COMMISSION
                                 Washington, DC
                                   FORM U-6B-2
                           Certificate of Notification


Filed by a registered  holding  company or subsidiary  thereof  pursuant to Rule
U-20-(d) [Reg.  Section  250.20,  P. 36,652] or U-47 [Reg.  Section  250.47,  P.
36,620] adopted under the Public Utility Holding Company Act of 1935.

Certificate  is  filed  by:  Central   Illinois  Public  Service  Company  d/b/a
AmerenCIPS (a subsidiary of Ameren Corporation).

This  certificate is notice that the above named company has issued,  renewed or
guaranteed the security or securities  described herein which issue,  renewal or
guaranty was  exempted  from the  provisions  of Section 6(a) of the Act and was
neither the subject of a  declaration  or  application  on Form U-1 nor included
within the exemption provided by Rule U-48 [Reg. Section 250.48, P. 36,621].

     1.  Type of securities ("draft", "promissory note"):  Promissory Notes.
     2.  Issue, renewal or guaranty:  Issue.
     3.  Principal amount of each security:  $150,000,000.
     4.  Rate of interest per annum of each security:  6.625%.
     5.  Date of issue, renewal, or guaranty of each security:  June 13, 2001.
     6.  If renewal of security, give date of original issue:  Not applicable.
     7.  Date of maturity of each security:  June 15, 2011.
     8.  Name of the person to whom each security was issued, renewed or
         guaranteed:  Goldman, Sachs & Co., Banc One Capital Markets,
         Inc. and Lehman Brothers, as underwriters, for sale to the public.
     9.  Collateral given with each security, if any:
         AmerenCIPS First Mortgage Bonds.
    10.  Consideration received for each security:  $148,720,500.
    11.  Application of proceeds of each security: The net proceeds were used
         (i) to repay short-term debt incurred to finance the repayment at
         maturity of $20 million aggregate principal amount of AmerenCIPS First
         Mortgage Bonds, Medium-Term Notes 6.73% Series 1997-2 due June 1, 2001,
         and (ii) to repay approximately $128 million of short-term debt which
         was in the form of intercompany borrowings under a utility money pool
         of Ameren Corporation, and was incurred generally to finance
         construction expenditures, maturities of long-term debt and other
         working capital needs.
    12.  Indicate by a check after the applicable statement below whether the
         issue, renewal or guaranty of each security was exempt from the
         provisions of Section 6(a) because of:
         a)  the provisions contained in the first sentence of
             Section 6(b):  Not applicable.
         b)  the provisions contained in the fourth sentence of
             Section 6(b):  Not applicable.
         c)  the provisions contained in any rule of the Commission other than
             Rule U-48:  [X].
    13.  If the security or securities were exempt from the provisions of
         Section 6(a) by virtue of the first sentence of Section 6(b), give the
         figures which indicate that the security or securities aggregate
         (together with all other than outstanding notes and drafts of a
         maturity of nine months or less, exclusive of days of grace, as to
         which such company is primarily or secondarily liable) not more than 5
         percentum of the principal amount and par value of the other securities
         of such company then outstanding. (Demand notes, regardless of how long
         they may have been outstanding, shall be considered as maturing in not
         more than nine months for purposes of the exemption from Section 6(a)
         of the Act granted by the first sentence of Section 6(b)): Not
         applicable.



    14.  If the security or securities are exempt from the provisions of Section
         6(a) because of the fourth sentence of Section 6(b), name the security
         outstanding on January 1, 1935, pursuant to the terms of which the
         security or securities herein described have been issued. Not
         applicable.
    15.  If the security or securities are exempt from the provisions of
         Section 6(a) because of any rule of the Commission other than
         Rule U-48 [Reg. ss. 250.48, P. 36,621] designate the rule under which
         exemption is claimed.  Rule 52.


                                   Central Illinois Public Service Company
                                              d/b/a AmerenCIPS


                                  By:    /s/ Jerre E. Birdsong
                                       --------------------------
                                      Jerre E. Birdsong, Treasurer

Dated:  June 15, 2001