Form 15 - Certification and Notice of Termination of Registration  Under Section
12(g)  of the  Securities  Exchange  Act of 1934 or  Suspension  of Duty to File
Reports Under Sections 13 and 15(d) of the Securities Exchange Act of 1934.

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                     FORM 15

                           Commission File Number 333-83815
                                                  ------------------------------

 Caithness Coso Funding Corp., Coso Finance Partners, Coso Energy Developers,
                             Coso Power Developers
- --------------------------------------------------------------------------------
           (Exact names of registrants as specified in their charters)

   565 Fifth Avenue, 29th Floor, New York, New York 10017-2478, (212) 921-9099
- --------------------------------------------------------------------------------
       (Address, including zip code, and telephone number, including area
               code, of registrant's principal executive offices)

                  9.05% Series B Senior Secured Notes Due 2009
- --------------------------------------------------------------------------------
            (Title of each class of securities covered by this Form)

                                      None
- --------------------------------------------------------------------------------
       (Titles of all other classes of securities for which a duty to file
                 reports under section 13(a) or 15(d) remains)

     Please  place  an X in  the  box(es)  to  designate  the  appropriate  rule
provision(s) relied upon to terminate or suspend the duty to file reports:

        Rule 12g-4(a)(1)(i)   [ ]           Rule 12h-3(b)(1)(i)   [X]
        Rule 12g-4(a)(1)(ii)  [ ]           Rule 12h-3(b)(1)(ii)  [ ]
        Rule 12g-4(a)(2)(i)   [ ]           Rule 12h-3(b)(2)(i)   [ ]
        Rule 12g-4(a)(2)(ii)  [ ]           Rule 12h-3(b)(2)(ii)  [ ]
                                            Rule 15d-6            [ ]

     Approximate  number of holders of record as of the  certification or notice
     date:  None
            ----

     Pursuant to the  requirements of the Securities  Exchange Act of 1934 (Name
of registrant as specified in charter) has caused this  certification/notice  to
be signed on its behalf by the undersigned duly authorized person.


Date:  October 14, 2005                CAITHNESS COSO FUNDING CORP.,
                                       a Delaware corporation

                                       By:  /S/  CHRISTOPHER T. MCCALLION
                                            -----------------------------
                                                 Christopher T. McCallion
                                                 Executive Vice President
                                                 Chief Financial Officer
                                                 (Principal Financial and
                                                 Accounting Officer)

Date:  October 14, 2005                COSO FINANCE PARTNERS AND SUBSIDIARY
                                       a California general partnership

                                       By: New CLOC Company, LLC,
                                             its Managing General Partner

                                       By:  /S/  CHRISTOPHER T. MCCALLION
                                            -----------------------------
                                                 Christopher T. McCallion
                                                 Executive Vice President &
                                                 Chief Financial Officer
                                                 (Principal Financial and
                                                 Accounting Officer)


Date:  October 14, 2005                COSO ENERGY DEVELOPERS
                                       a California general partnership

                                       By: New CHIP Company, LLC,
                                             its Managing General Partner

                                       By: /S/ CHRISTOPHER T. MCCALLION
                                           ----------------------------
                                               Christopher T. McCallion
                                               Executive Vice President &
                                               Chief Financial Officer
                                               (Principal Financial and
                                               Accounting Officer)


Date:  October 14, 2005                COSO POWER DEVELOPERS AND SUBSIDIARY
                                       a California general partnership

                                       By: New CTC Company, LLC,
                                             its Managing General Partner

                                       By: /S/ CHRISTOPHER T. MCCALLION
                                           ----------------------------
                                               Christopher T. McCallion
                                               Executive Vice President &
                                               Chief Financial Officer
                                               (Principal Financial and
                                               Accounting Officer)

INSTRUCTION:  This  form is  required  by Rules  12g-4,  12h-3  and 15d-6 of the
General Rules and  Regulations  under the  Securities  Exchange Act of 1934. The
registrant  shall file with the Commission three copies of Form 15, one of which
shall be manually signed.  It may be signed by an officer of the registrant,  by
counsel or by any other duly authorized person. The name and title of the person
signing the form shall be typed or printed under the signature.