As filed with the Securities and Exchange Commission on August 26, 2004.



                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

    In the Matter of                                              CERTIFICATE
     Cinergy Corp.                                                    OF
    File No. 70-10015                                             NOTIFICATION

(Public Utility Holding Company Act of 1935)


     With reference to the transactions proposed in the  Application-Declaration
on Form U-1, as  amended,  in the above  proceeding  filed by Cinergy  Corp.,  a
Delaware  corporation  and a registered  holding company  ("Cinergy")  under the
Public  Utility  Holding  Company Act of 1935, as amended (the "Act"),  and with
reference to the Commission's  order dated October 23, 2002 with respect thereto
(HCAR  No.  27581)(the  "Order"),  and  in  particular  the  periodic  reporting
requirements   set  forth  therein,   Cinergy  hereby   supplies  the  following
information  covering the six month period from January 1, 2004 to and including
June 30, 2004 (the "Reporting Period"):

1.   Cinergy had four  subsidiaries  during the Reporting Period  (collectively,
     the "Cinergy IS Subs") that were engaged,  directly or  indirectly,  in the
     business of  providing  Infrastructure  Services (as defined in the Order):
     Cinergy  Supply  Network,  Inc., a Delaware  corporation  ("CSN");  Reliant
     Services,  LLC,  an  Indiana  limited  liability  company  ("Reliant");  MP
     Acquisition Corp., an Indiana corporation  ("Acquisition  Sub"); and Miller
     Pipeline Corporation,  an Indiana corporation ("Miller Pipeline"). CSN is a
     wholly-owned   subsidiary  of  Cinergy,  while  Cinergy  owns  50%  of  the
     outstanding  voting  securities  of each of  Reliant,  Acquisition  Sub and
     Miller Pipeline.

2.   Cinergy's aggregate investment in the Cinergy IS Subs at June 30, 2004 was
     approximately $29 million.

3.   The following provides information for the Reporting Period concerning any
     Infrastructure Services provided by any of the Cinergy IS Subs to any
     associate or affiliate public utility company thereof (all such services
     were rendered at "cost" (as defined in Rule 91 under the Act) pursuant to
     and in accordance with the various service agreements approved by the
     Commission by order dated May 4, 1999 in File No. 70-9449 (HCAR No.
     27016)):


Cinergy IS Sub      Associate Utility    Type of Services   Total Amount Billed
Rendering Services  Company Receiving       Rendered          (in thousands)
                        Services


Reliant           The Cincinnati Gas &    Line locating and       $1,310
                  Electric Company (CG&E)  meter reading

Reliant           PSI Energy, Inc. (PSI)  Line locating and
                                           meter reading          $2,452

Reliant           The Union Light, Heat   Line locating and
                    and Power Company       meter reading
                       (ULH&P)                                     $83

Miller Pipeline         CG&E              Maintenance and
                                        construction services     $4,358

Miller Pipeline         PSI              Maintenance services     $312

Miller Pipeline        ULH&P             Maintenance services     $500




                                S I G N A T U R E

         Pursuant to the requirements of the Act, the undersigned company has
duly caused this document to be signed on its behalf as of the date indicated
below by the undersigned thereunto duly authorized.

Date:  August 26, 2004

                                                     CINERGY CORP.


                                                     By: /s/Wendy L. Aumiller
                                                         Wendy L. Aumiller
                                                         Treasurer