================================================================================

                                    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 March, 2006

                        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
                                                        ---


================================================================================





                                  RELEVANT FACT


New York, 22 March,  2006. On 25 November,  Endesa  (NYSE:  ELE) , S.A.  filed a
lawsuit  against Gas Natural SDG, S.A. and  Iberdrola,  S.A. with the Mercantile
Court based on article 81 of the European Community's Constitution,  in which it
claimed that Gas Natural SDG,  S.A. and  Iberdrola,  S.A. had reached an illegal
agreement under the terms of such article.  The lawsuit is being heard by Madrid
Mercantile Court n(0) 3 under ordinary trial number 523/2005.
On 21 March,  2006,  Madrid Mercantile Court n(0) 3 entered an order on Endesa's
motion for interim  measures in the  aforementioned  proceeding,  the  operative
portion of which is interimas follows:

     "Having studied  ENDESA's  request for interim measures against GAS NATURAL
     SDG, S.A. and IBERDROLA, S.A., I order the suspension of, and declare to be
     suspended,  thefollowing:
     a) The carrying out of the tender offer  launched by GAS NATURAL SDG,  S.A.
     on 5 September,  2005 for ENDESA's shares and, therefore, the taking of any
     and all actions  relating to, or in connection with, said tender offer, and
     in particular the acquisition of shares in ENDESA by GAS NATURAL.
     b) The  carrying out of the  contract  dated 5 September,  2005 between GAS
     NATURAL and IBERDROLA.
     In order for the foregoing  suspension to take effect,  the plaintiff  must
     deposit ONE  THOUSAND  MILLION  EUROS to cover  possible  losses or damages
     arising from the adoption and  maintenance of the interim  measures  hereby
     granted by means of an unconditional bank guarantee of indefinite  duration
     payable to the Court, which must be furnished within TEN DAYS.

     There is no special ruling with respect to costs.

     All  parties  are  informed  of this  ruling and have leave to appeal  this
     ruling to the  Audencia  Provincial  de Madrid,  which must be presented in
     writing within five days following  this  notification  and which shall not
     have the effect of suspending this ruling.
     All  parties  are  informed  of this  decision  as  well as the  Anti-trust
     Authority and the Spanish National Securities Market Commission.  They have
     been  informed  that the measures  agreed will only be  effective  once the
     guarantee has been  received and accepted by means of a further  resolution
     passed by this Court, which will be duly communicated."

A complete copy of this ruling is attached to this Relevant Fact notice.

Endesa, S.A. is studying the contents and effects of the aforementioned ruling
with its legal advisers. Endesa, S.A.'s Board of Directors will meet in the
coming days to analyse the implications of this ruling and decide on how to
proceed.





The following is a complete  translation of the ruling, as an attachement to the
Relevant Fact notice.

     COMMERCIAL COURT NUMBER 3 OF MADRID
     GRAN VIA 52

     ORDINARY PROCEEDING 523/05
     SPECIAL PART REGARDING INTERIM EQUITABLE RELIEF

                                     RULING

     Madrid, March twenty-first, two thousand six

                                      FACTS

     FIRST.- The Procurator, Mr. Guerrero Tramoyeres, acting for and on behalf
     of ENDESA, S.A., formulated a petition for ordinary proceedings against GAS
     NATURAL SDG, S.A. and against IBERDROLA, S.A. based on Article 81 of the
     Treaty on European Union, seeking nullification of the agreement said to
     have been reached by the two respondent companies on a date that is not
     specified but that was prior to the 5th of September, 2005, and of the
     instruments used to execute said agreement, in particular the contract
     signed by the two respondents on September 5, 2005 and the public tender
     offer (PTO) for Endesa, formulated by Gas Natural SDG, S.A. and submitted
     to the Spanish National Securities Market Commission [CNMV] on the same
     date, September 5, 2005. The complaint indicates that the amount is
     undetermined, because no petition for indemnification has been filed, but
     only the declaration of nullification of the agreement. By means of a
     secondary petition, supported on the facts and grounds set forth in the
     brief of complaint, a request was formulated for adoption of





     interim equitable relief consisting of: a) suspension of the processing of
     the PTO for the shares of ENDESA and, consequently, suspension of all
     actions relative to or related to the aforementioned PTO, especially the
     acquisition of shares of ENDESA by GAS NATURAL; and b) suspension of
     performance of the September 5, 2005 contract signed by GAS NATURAL and
     IBERDROLA. Plaintiff offers to constitute a guarantee in the amount
     specified, proposing one million euros or the amount prudently established
     by the Court, in the form of a bank guarantee.

     SECOND. - The complaint having been accepted for processing by Ruling dated
     December 21, 2005, it was agreed that the interim equitable relief would be
     handled as a Special Part, for which purpose the parties were summoned to a
     hearing. The hearing having been held on March seventh, 2006, all appeared
     in the proper manner, Plaintiff confirming its petition and the respondents
     asserting their objections, in relation to the appropriateness of adopting
     the interim equitable relief requested by Plaintiff, the existence of the
     legal requirements for fumus boni juris, appearance of danger from delay of
     the proceeding and sufficiency of guarantee, and, specifically:

          1. The representation of GAS NATURAL, in addition to confirming that
          which it put forth in the plea as to the jurisdiction of the Court
          with respect to the lack of [subject matter] and territorial
          jurisdiction, objected to the interim equitable relief because it
          believes, in short, that it was not possible to determine the element
          of fumus boni juris, since there was no "comprehensive" prior
          agreement whatever between the respondents, and that there were just
          mere indications thereof, and that the agreement to sell assets
          reached on September 5, 2005, within the framework of the plan for
          divestment of electricity and gas assets that Gas Natural SDG intended
          to submit to the Spanish authorities with respect to the Public Tender
          Offer for shares of Endesa was legal and valid,





          with Plaintiff trying to convert a structural operation to a question
          of conduct, submitting the preparatory acts step [sic] necessary for
          submission of the PTO and for the signing of the agreements between
          GAS NATURAL/IBERDROLA as collusive agreements, also asserting that the
          application of Article 81 of TEC was incompatible with merger
          transactions, which was what was happening in this case. He concluded
          by alleging the absence of periculum in mora, due to non-existence of
          a risk of grave and irremediable harm in view of the successive
          administrative authorities that would review the transaction and that
          both the PTO and the Agreement for Sale of Assets are conditioned on
          their acceptance by the shareholders of Endesa, and that the
          respondents do not have authority to implement the requested interim
          equitable relief, offering a bond for costs, in accordance with the
          provisions of Article 64.2 of the Civil Procedure Act, of one million
          euros.

     2.   IBERDROLA alleged, in short, the absence of the requirements for
          adoption of the interim equitable relief along lines similar to those
          argued by the other co-respondent, insisting that there is no
          periculum in mora in view of the disallowance of ENDESA's petitions in
          the Court of First Instance of the European Communities on February 1,
          2006 in the matter [of] "ENDESA vs. the European Commission," brought
          by Plaintiff via a complaint against the decision of this Body
          rejecting, in favor of the competent Spanish authorities, the
          "Community-wide dimension" of the transaction involving a merger that
          the aforementioned PTO entails, applying (EC) Regulation 139/2004,
          dated January 20, regarding Mergers, and the rejection








          of its claims in the Administrative Law Division of the Supreme Court
          in ENDESA's administrative appeal of the Council of Ministers'
          Decision dated February 3, 2006 authorizing, with conditions, the
          aforementioned PTO, [and] concluding with the allegation of
          insufficiency of the guarantee offered by Endesa for adoption of the
          interim equitable relief.

     THIRD.- After the allegations, the parties offered evidence, submitting
     that which was accepted, which consisted only of documentary evidence, with
     the result that is on record in the proceedings; and issuance of the
     respective ruling was in order.

                                  LEGAL GROUNDS

     FIRST. Fumus boni juris. In accordance with the provisions of Article 728
     of the Civil Procedure Act (LEC, Spanish acronym), it is necessary to
     analyze, first, whether the essential circumstance of fumus boni juris
     exists in this case. In this initial phase of the proceeding, of any
     ordinary declaratory judgment action, it is not possible to rule on the
     merits or lack of merit of the actions taken, since the proceedings for
     their analysis have not been carried out, and, in particular, there is no
     probatory activity whatever; and, in fact, aside from the evidence, all the
     factors within the framework of the legal action have not yet been
     established. The assessment which is possible at this phase of the
     proceeding, and that must be made with a view to ruling on the interim
     equitable relief, is in no way probabilistic, in the respect of whether the
     total or partial consideration of the complaint, or its disallowance, seems
     more reasonable; but only possibilistic, that is, whether, in the event
     that





     the facts described by Plaintiff correspond to the actual situation, and
     the right alleged is apparently and, at first sight, correct, what could be
     derived from all that is an affirmative judgment at the proper time.
     Consequently, it is rather a question of rejecting the cases with a high
     probability of total disallowance of the complaint.

     It is appropriate, in this respect, to stress that the action is based on
     the possible application to the case of Article 81 of the Treaty on
     European Union, and that raises, at least, two different debatable factors.
     On the one hand, if, as Plaintiff maintains, there was previously an
     agreement between the respondents, of vague content and culminating on an
     unknown date, of which the PTO and the September 5, 2005 contract would be
     mere instruments of execution, so that the PTO and contract were both
     previously agreed to by the respondents, forming part of that agreement
     with the objective, or the consequence, of removing ENDESA, S.A. from the
     market; or whether that previous agreement did not exist, which is the
     respondents' position, but rather the PTO was decided upon exclusively by
     GAS NATURAL SDG, S.A. and, after having made that decision individually
     and, consequently, without agreement, it reached agreement with IBERDROLA,
     S.A., on the September 5, 2005 contract to better implement that previous
     personal decision. According to whether what really happened was the former
     scenario or the latter, the sequence of actions in the provisions of
     Article 81 of the Treaty on European Union could be includable, or not,
     whatever the position taken with respect to the true dimension and meaning
     of the Treaty in general and Article 81 in particular.

     Moreover, the respondents discuss the true meaning of Article 81 of the
     Treaty on European Union, which is on [sic] the basis of this proceeding
     and, more specifically, whether this precept refers exclusively to the
     circumstances of





     transactions which, because of their supranational dimension, produce
     relevant effects at the same time in several states of the European Union,
     and with sufficient significance to affect that intended "commerce among
     the member States" that would, supposedly, be the interest legally
     protected by the treaty; or whether it is sufficient that those relevant
     effects are projected on the domestic market of any of the States
     considered in isolation. In a first assessment, it seems reasonable to deem
     that, if one advocates the advisability of the "common market" to which the
     initial declaration of Article 81 of the Treaty on European Union refers,
     it is difficult to advocate that condition of "common" in an alleged
     situation consisting, at the same time, of a different domestic market for
     each Member state, which would thus be [the] "domestic" or "particular"
     market of the residents of that State, but not "common," plus another,
     supranational, referring just to the cases in which several member States
     are simultaneously affected. On the contrary, it is more reasonable to
     understand that any action that could affect, with a certain degree of
     relevance, the market of any State, affects that sole, protected "common
     market," so that it is sufficient for the act in question to be capable of
     causing or constituting any of the destructive practices that the article
     in question tries to prevent, for Article 81 of the Treaty on European
     Union to be fully applicable.

     The two respondents maintain that Article 81 of the Treaty on European
     Union is not applicable to the case, because it deals with a merger
     process, and these types of transactions are excluded from the scope of
     application of that precept which protects competition. Certainly, Article
     81 of the Treaty on European Union is not applicable to merger processes,
     it being possible to maintain that both possibilities, collusion and
     merger, constitute different, mutually exclusive categories, so that if, in
     fact, it is a question of a merger transaction and all the actions taken by
     the parties correspond typically to a merger,





     the aforementioned Article 81 of the Treaty on European Union would not be
     applicable, nor would it be within the purview of this Court to rule on the
     matter. Now, then, this inapplicability of the provisions of Article 81 of
     the Treaty on European Union can be maintained only on the basis of the
     respondents' assertion of the non-existence of a prior pact or agreement
     between GAS NATURAL SDG, S.A. and IBERDROLA, S.A., since it is clear that,
     the September 5, 2005 agreement between the respondents not being denied,
     it can respond to just two situations: it is either an instrument for
     execution of the collusive agreement or it is a legal transaction,
     complementary [to] but independent of the PTO unilaterally decided upon by
     GAS TANURAL [sic] SDG, S.A.; and this is the crux of the lawsuit, on which,
     at this time, it is not possible to rule, as we have said. In short,
     arguing that it is a matter of one or two merger transactions is equivalent
     [to] or the same as denying the existence of the collusive agreement
     maintained by Plaintiff.

     The magnitude of the transaction and the financial resources whose
     mobilization is required, its own internal complexity, and the specific
     natures of the gas and electricity markets, with their special geographic
     features, as well as the specification of the plants and business units
     that are objects of the agreed-upon future transfer or distribution between
     the respondents, seem to support, from the brief objective analysis that
     can be carried out in this phase, the existence of that prior agreement,
     since it does not seem reasonable that GAS NATURAL SDG, S.A. would
     undertake a transaction of such breadth without having the functional, but
     also financial, destiny of those plants or business units less closely
     related to its principal lines of business assured as a way to reduce the
     final amount of the monetary effort involved; in other words, without
     having first anticipated and ensured the full cooperation, as participant
     or cooperator (1) with respect to the result, of IBERDROLA, S.A. Thus, the
     hypothesis of the prior agreement seems reasonable


- ------------------
(1)  Translator's note: There appears to be a typographical error for
"cooperator" in this sentence.





     and this leads to the applicability of Article 81 of the Treaty on European
     Union and to the competence of this jurisdiction; however, it bears
     repeating once again, it results from the just initiated process.

     The question having been analyzed from this perspective, we conclude with a
     favorable view with respect to that fumus boni juris, in the sense, already
     noted, that it seems merely possible that the complaint will be successful,
     inasmuch as the facts set forth could, in fact constitute a violation of
     Article 81 of the Treaty on European Union, resulting in nullification of
     the agreements and actions resulting from them, postulating, in short, that
     declaration of nullity, which would be in order if the assumption were
     confirmed; and the basic legal allegation does not seem to lack foundation,
     since what is sought is a judicial declaration based on a rule contained in
     the Treaty on European Union.

     SECOND. Fumus periculum in mora. The following requirement of article 728
     of the Civil Procedure Law (LEC), previously cited, makes reference to a
     risk deriving from procedural delay while this proceeding is before the
     court. Such delay would be of a magnitude sufficient to impede or hinder
     the effectiveness of the judicial relief that could be derived from a
     possible affirmative judgment pursuant to the fundamental claims of this
     case.

     With regard to the probable duration [of such a delay], it must be stated
     that, due to the intrinsic complexity of this first-instance proceeding and
     the parties' radically conflicting positions, the delay will





     likely be lengthy. Note, for example, that although the petition for the
     principal proceeding was filed in December of the previous year, it has yet
     to be answered by the respondents, because of the plea as to the
     jurisdiction of the Court that is [presently] under consideration.

     With regard to the substance of the case, Plaintiff's claims refer to the
     statement that the pact or agreement between GAS NATURAL SDG, S.A. and
     IBERDROLA, S.A. is contrary to law and therefore null and void, as are both
     instruments which it is said the agreement gave rise to, for its
     performance: GAS NATURAL's PTO for all the shares of ENDESA and the
     September 5, 2005 contract between the respondents, and that both
     instruments of implementation, the PTO and the contract, should be declared
     null and void.

     Concerning the PTO, it is clear that an affirmative judgment pursuant to
     Plaintiff's claims would be utterly irrelevant had such a transaction
     already ended, because the share transfers that could result therefrom are
     irrevocable, both legally and materially. They are irrevocable legally as a
     result of organized securities market regulations (article 9 of the
     Securities Market Law [Ley del Mercado de Valores] and art. 11, covering
     payment systems and sale of securities), while they are materially
     irrevocable because of the enormous number and scattered locations of the
     people affected. The agreement between the respondents is subordinate to
     the PTO, because the goal of the agreement is to make Plaintiff disappear,
     or to have the same practical outcome. Naturally, this is a mere assessment
     of the possibility that, [by] not adopting the interim equitable relief,
     the aforementioned result could take place.





     The consequences of this action would be irreparable or [make it]
     impossible to go back to the previous condition, because it tends toward
     irreversible situations.

     With such a possibilistic analysis, interim equitable relief does not seem
     capable of causing such irreversible results for the respondents. Of
     course, if the complaint were ultimately dismissed, a clear delay would
     ensue, and this would probably give rise to damages stemming from the
     securities markets as well as other causes. However, all these damages can
     be fully recovered after they are duly assessed financially, without
     otherwise suffering any consequences of the unfeasibility of the projected
     transactions.

     The conclusion with regard to this legal requirement for adopting the
     interim equitable relief is that, effectively, there exists in this case
     the periculum in mora discussed in art. 728 LEC.
     THIRD. Evaluating the [interim equitable relief] measures. Pursuant to the
     regulations of art. 726 LEC, the existence of other measures that would
     achieve the same end but be less burdensome or harmful to the respondents
     than those offered by Plaintiff must be considered. Given the specific
     purpose of the principal claim, there does not appear to be another type of
     measure that would be as effective as the [type of] judicial relief sought
     here. As previously indicated, this judicial relief would be thwarted if
     the PTO and contract are not stayed while the decision is being rendered.
     It is not a matter of measures that are less burdensome, but that it is not
     understood what other measure, independent of its potential





     consequences, would be able to guarantee the result being sought.

     It must be remembered that the exclusive goal of the interim equitable
     relief is to bring about the judicial relief that could be granted in a
     possible affirmative judgment, so that it cannot be prevented or hindered
     by events that occur during the trial. Therefore, such events must be
     prevented from taking place until the proceeding is decided.

     FOURTH. Guarantee. Pursuant to the foregoing, all of the legal requirements
     leading to the decision to grant the interim equitable relief sought by
     Plaintiff are hereby met. Now then, the adoption of the relief and its
     probable dissemination, and--even more [important]--its duration, may have
     negative consequences in the form of damages for the respondents, that they
     would not be legally obligated to bear if the complaint against them were
     ultimately dismissed. In this sense, we cannot accept Plaintiff's argument
     that the interim equitable relief--especially the stay of the PTO--would be
     harmless because if the complaint is dismissed, [the respondents] would be
     in the same position as in the beginning. This is because the markets are
     essentially changeable, and although it is not possible at this time to
     specify how these changes may occur, we must take into account that the
     simple passage of time, together with today's omnipresent media activity,
     will produce the necessary results. Business activity is dynamic, and
     neither the businesses involved in this case--nor the economic environment,
     the financial sector or even the political sector--will be paralyzed while
     the complaint is being heard [in court].





     From a procedural point of view, the fundamental significance of the
     dispute is indefinable or incalculable. However, we cannot lose sight of
     the quantitative financial underpinnings of the transactions being
     contemplated here, given that it is public knowledge that GAS NATURAL's PTO
     for ENDESA's shares amounts to some twenty billion euros. ENDESA offered to
     constitute a guarantee in the amount of one million euros, which counsel
     for GAS NATURAL and for IBERDROLA consider insufficient. Although GAS
     NATURAL does not propose a concrete amount, it suggests that the damages
     could be equal in amount to that of the PTO. It is reasonable to propose
     that the damages that could arise from adopting and following the measures
     for interim equitable relief, which must be unequivocally guaranteed
     beforehand, should be proportional to the amount of the PTO; thus, it is
     considered appropriate, for purposes of the guarantee, to set them at five
     percent of the aforementioned amount, that is, in the amount of ONE BILLION
     EUROS. Therefore, pursuant to the provisions of art. 735.2 of the LEC, it
     is appropriate to make the interim equitable relief conditional on ENDESA,
     S.A.'s constituting a guarantee within ten days, through a bank guarantee
     payable on first demand, unconditional and for an indefinite period,
     [payable] to this Court. This bond will be in effect for the duration of
     the interim equitable relief, in the indicated amount of one billion euros.
     The interim equitable relief will become null and void if the guarantee is
     not furnished in the form, amount and term indicated.

     FIFTH. Communication with Administrative Agencies. By analogy with the
     foregoing with regard to the decisions,





     Article 15.2 of Regulation (EC) 1/2003 of the Council, the only Additional
     Provision of Law 16/1989 for Protection of Competition, and article 8.2 of
     the Royal Decree of December 10, 2004, require that a copy of this decision
     be submitted to the Commission for the Protection of Competition [Servicio
     de Defensa de la Competencia] at the time the parties are notified.

     Similarly, by including the stay of the PTO, and of course because the
     interim equitable relief is linked to corporations of great importance and
     presence on Spain's securities exchanges, the publicity surrounding this
     decision could affect the normal functioning of the markets. [However,]
     transparency of the securities exchanges, correct pricing of securities and
     protection of investors, and oversight and inspection thereof are the
     duties of the National Securities Market Commission [Comision Nacional del
     Mercado de Valores]. Therefore, as much information as necessary should be
     disseminated to guarantee that these ends will be achieved, pursuant to the
     provisions of article 13 of the Securities Market Law 24/1998, of July 28.
     The National Securities Market Commission must be notified immediately of
     this decision in the event that it deems it necessary to take action in
     that regard, without precluding communication of the stay of GAS NATURAL's
     PTO through an official notice, assuming that ENDESA will constitute the
     guarantee set in this Ruling in the coming days.

     SIXTH. The exceptional circumstances presented by this case, which is
     certainly novel and a topic of debate, together with the attitude and
     position of the parties concerning the





     interim equitable relief, have led [this Court] not to issue an express
     decision with regard to the costs of the incident.


                                     HOLDING

     With regard to the petition for interim equitable relief by the
     representation of ENDESA against GAS NATURAL SDG, S.A. and IBERDROLA, S.A.,
     I order suspension of and I declare suspended:

     a)   Processing of the PTO formulated by GAS NATURAL SDG, S.A. on 5
     September 2005 for the shares of ENDESA and, consequently, execution of all
     the actions relative to or related to the aforementioned PTO, especially
     the acquisition of shares of ENDESA by GAS NATURAL.

     b)   Performance of the September 5, 2005 contract signed by GAS NATURAL
     and IBERDROLA.

     For the effective exercise of the foregoing interim equitable relief,
     Plaintiff shall first constitute a guarantee in the amount of ONE BILLION
     EUROS to address possible damages resulting from the adoption and
     maintenance of the interim equitable relief, by means of a joint and
     several bank guarantee in favor of this Court, unconditional, of indefinite
     duration, payable on first demand, to be delivered within TEN DAYS.

     No special ruling is issued regarding costs.





     Let the parties be notified of this ruling and advised that an appeal may
     be filed with the High Provincial Court of Madrid, prepared in writing and
     submitted to this Court within the five days following notification, and
     that it will be accepted without suspensive effect.

     Let the Service for the Commission for Protection of Competition and the
     Spanish National Securities Market Commission be fully and immediately
     advised of this ruling, at the same time the parties are notified,
     informing them that the interim equitable relief will be effective only
     when the guarantee has been constituted and accepted by means of a new
     ruling to be issued by this Court, of which they will also be notified.

     So ruled and signed the Hon. MRS. MIRIAM IGLESIAS GARCIA, Judge of
     Commercial Court No. 3 of Madrid. I certify. Signed: Miriam Iglesias
     Garcia. Concepcion Lopez de Hontanar. - Sealed.

               [handwritten:] copy
               [illegible stamp]





                                   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: March 22nd, 2006      By: /s/ Alvaro Perez de Lema
                                --------------------------
                             Name: Alvaro Perez de Lema
                             Title: Manager of North America Investor Relations