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                                    FORM 6-K
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            Report of Foreign Issuer

                      Pursuant to Rule 13a-16 or 15d-16 of
                       the Securities Exchange Act of 1934

                         For the month of October, 2005

                        Commission File Number: 333-07654


                                  ENDESA, S.A.
                 (Translation of Registrant's Name into English)

                              Ribera del Loira, 60
                               28042 Madrid, Spain
                     (Address of principal executive office)

        Indicate by check mark whether the registrant files or will file
              annual reports under cover of Form 20-F or Form 40-F:

                 Form 20-F    X                      Form 40-F
                             ---                                  ---

       Indicate by check mark if the registrant is submitting the Form 6-K
            in paper as permitted by Regulation S-T Rule 101(b)(1):

                 Yes                                 No            X
                             ---                                  ---
       Indicate by check mark if the registrant is submitting the Form 6-K
            in paper as permitted by Regulation S-T Rule 101(b)(7):

                 Yes                                 No            X
                             ---                                  ---

 Indicate by check mark whether by furnishing the information contained in this
     Form, the Registrant is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934:

                 Yes                                 No            X
                             ---                                  ---

  If "Yes" is marked, indicate below the file number assigned to the registrant
                     in connection with Rule 12g3-2(b): N/A
                                                        ---

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                                  RELEVANT FACT



New York, October 13, 2005.- Endesa (NYSE: ELE) has informed the U.S. Securities
and  Exchange  Commission  (SEC) of La Caixa's  possible  failure to comply with
several  obligations  imposed by the U.S. federal securities laws as a result of
La Caixa's significant stakes in Endesa and Repsol YPF, including the obligation
to promptly report its plans with respect to those  companies,  whose shares are
listed in the form of ADRs on the New York Stock Exchange. In addition, La Caixa
may have neglected its  obligations to the U.S.  investor  market by omitting to
file with the SEC its public  statements with respect to the tender offer by Gas
Natural for Endesa with La Caixa's support.

Of particular interest is La Caixa's sale of a significant portion of its shares
in Endesa,  which may have coincided with the  preparatory  phase for the tender
offer (two months prior to its public  announcement),  as this action could have
been  perceived  by the market as signaling a lack of interest on the part of La
Caixa (and hence Gas Natural) in seeking a business  combination  between Endesa
and Gas Natural.

Endesa has  informed  the SEC of the  following  matters  that may  constitute a
violation of the U.S. federal securities laws (Securities Exchange Act of 1934):

o    La Caixa has never  filed a report on Schedule  13D with the SEC,  which it
was  required  to do in respect of its  shares in Endesa and Repsol  YPF,  which
companies are listed in the form of ADRs on the New York Stock  Exchange  (NYSE)
and in which La Caixa owns or has owned an interest in excess of 5 percent.

o    La Caixa has likewise failed to reveal by means of a Schedule 13D its plans
and intentions with respect to the above-mentioned  companies, which may include
matters  relating to the hostile  tender  offer by its  investee Gas Natural for
Endesa and to the sale of assets of Endesa to Iberdrola the terms of which could
affect Endesa shareholders and remain unknown publicly.

o    La Caixa  also  failed to report  to the SEC its plans to take  control  of
Repsol and replace its chairman and senior management with the goal (as reported
by the press at the time) of supporting  transactions set in motion by la Caixa,
among which a possible business combination between Gas Natural and Endesa.

o    La  Caixa  has not  informed  the  market  through  the  SEC of its  public
statements  and  communications  with  respect to the  tender  offer by means of
Schedule  14D-9,  which is La Caixa is  subject  to by virtue of its status as a
shareholder  of the offeror  and its  decisive  role in the tender  offer by Gas
Natural.

o    La Caixa has taken significant  actions publicly that are inconsistent with
a plan for a business  combination  between  Gas  Natural  and  Endesa,  such as
statements  by Gas Natural's  president  and La Caixa's vice  president in April
2005  that  no  business  combination  with an  electricity  company  was  being
considered, as well as La Caixa's disposal of a significant portion of its stake
in Endesa only two months prior to the announcement of the tender offer, actions
that could have influenced third parties'  investment  decisions in Endesa based
on incorrect assumptions.



           For additional information please contact Alvaro Perez de
           Lema, North America Investor Relations Office, telephone #
                                  212 750 7200
                              http://www.endesa.es









                                   SIGNATURES

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.

                                                  ENDESA, S.A.

Dated: October 13th, 2005              By: /s/ Alvaro Perez de Lema
                                           ------------------------
                                       Name: Alvaro Perez de Lema
                                       Title: Manager of North America Investor
                                              Relations