Base Prospectus dated 9 January 2020 ENEL – Società per Azioni (incorporated with limited liability in Italy) as an Issuer and Guarantor and ENEL FINANCE INTERNATIONAL N.V. (a limited liability company incorporated in The Netherlands, having its registered office at Herengracht 471,1017 BS Amsterdam, The Netherlands) as an Issuer €35,000,000,000 Euro Medium Term Note Programme On 7 December 2000 ENEL — Società per Azioni (“ENEL” or the “Company”) entered into a Global Medium Term Note Programme (the “Programme”) and issued an offering circular on that date describing the Programme. The Programme was subsequently updated, most recently on 17 December 2018. This base prospectus (the “Base Prospectus”), which provides for the Programme to be a Euro Medium Term Note Programme, supersedes all previous offering circulars. Any Notes (as defined below) issued under the Programme on or after the date of this Base Prospectus are issued subject to the provisions herein. This does not affect any Notes already issued. Under the Programme, each of ENEL and ENEL Finance International N.V. (“ENEL N.V.”) may from time to time issue notes (the “Notes”) denominated in any currency agreed between the relevant Issuer and the relevant Dealer (as defined below). References in this Base Prospectus to the “relevant Issuer” shall, in relation to any Tranche of Notes, be construed as references to the Issuer which is, or is intended to be, the Issuer of such Notes as indicated in the applicable Final Terms. The payment of all amounts owing in respect of Notes issued by ENEL N.V. will be unconditionally and irrevocably guaranteed by ENEL in its capacity as guarantor (the “Guarantor”). ENEL N.V. has a right of substitution as set out in Condition 16(a) and Condition 16(c). ENEL N.V. may at any time, without the consent of the Noteholders or the Couponholders, substitute for itself as principal debtor under the Notes and the Coupons either ENEL as Issuer or any of ENEL’s Subsidiaries (as defined below). ENEL or the relevant Subsidiary (failing which, ENEL) shall indemnify each Noteholder and Couponholder against any adverse tax consequences of such a substitution, except that neither ENEL nor the relevant Subsidiary shall be liable under such indemnity to pay any additional amounts either on account of “imposta sostitutiva” or on account of any other withholding or deduction in the event of payment of interest or other amounts paid to a non-Italian resident legal entity or a non-Italian resident individual which is resident in a country which does not allow for a satisfactory exchange of information. When ENEL N.V. is to be substituted by another of ENEL’s Subsidiaries, such substitution may only take place if ENEL continues to guarantee the obligations of such Subsidiary. For further details regarding ENEL N.V.’s right of substitution see Condition 16(a) and Condition 16(c). ENEL has a right of substitution as set out in Condition 16(b). ENEL may, at any time, without the consent of the Noteholders or the Couponholders, substitute for itself as principal debtor under the Notes and Coupons any of its Subsidiaries provided that ENEL shall guarantee the obligations of such Subsidiary. The relevant Subsidiary (failing which, ENEL) shall indemnify each Noteholder and Couponholder against any adverse tax consequences of such a substitution, except that neither the relevant Subsidiary nor ENEL shall be liable under such indemnity to pay any additional amounts either on account of “imposta sostitutiva” or on account of any other withholding or deduction in the event of payment of interest or other amounts paid to a non-Italian resident legal entity or a non-Italian resident individual which is resident in a country which does not allow for a satisfactory exchange of information. For further details regarding ENEL’s right of substitution, see Condition 16(b). Notes may be issued in bearer or registered form (respectively “Bearer Notes” and “Registered Notes”). The maximum aggregate nominal amount of all Notes from time to time outstanding under the Programme will not exceed €35,000,000,000 (or its equivalent in other currencies calculated as described herein), subject to increase as described herein. The Notes may be issued on a continuing basis to one or more of the Dealers specified under “Overview of the Programme” and any additional Dealer appointed under the Programme from time to time by the relevant Issuer (each a “Dealer” and together the “Dealers”), which appointment may be for a specific issue or on an ongoing basis. References in this Base Prospectus to the “relevant Dealer” shall, in the case of an issue of Notes being (or intended to be) subscribed by more than one Dealer, be to all Dealers agreeing to purchase such Notes. An investment in Notes issued under the Programme involves certain risks. For a discussion of these see “Risk Factors”. This Base Prospectus has been approved as a base prospectus by the Central Bank of Ireland (the “Central Bank”), as competent authority under Regulation (EU) 2017/1129 (the “Prospectus Regulation”). The Central Bank only approves this Base Prospectus as meeting the standards of completeness, comprehensibility and consistency imposed by the Prospectus Regulation. Approval by the Central Bank should not be considered as an endorsement of ENEL or ENEL N.V. or of the quality of the Notes. Investors should make their own assessment as to the suitability of investing in the Notes. Such approval relates only to Notes which are to be admitted to trading on the regulated market of the Irish Stock Exchange plc trading as Euronext Dublin (“Euronext Dublin”) or other regulated markets for the purposes of Directive 2014/65/EU (as amended) (“MiFID II”) or which are to be offered to the public in any Member State of the European Economic Area (the “EEA”). Application has been made to Euronext Dublin for Notes issued under the Programme to be admitted to the Official List and trading on its regulated market. Notice of the aggregate nominal amount of Notes, interest (if any) payable in respect of Notes, the issue price of Notes will be set out in the final terms (the “Final Terms”) which, with respect to Notes to be listed on Euronext Dublin, will be filed with the Central Bank. The Central Bank has been requested to provide a certificate of approval and a copy of this Base Prospectus to the relevant competent authority in Luxembourg. The Programme provides that Notes may be listed or admitted to trading, as the case may be, on such other or further stock exchanges or markets as may be agreed between the relevant Issuer and the Guarantor (where ENEL is not the relevant Issuer) and the relevant Dealer. Where Notes issued under the Programme are listed or admitted to trading on a regulated market within the EEA or offered to the public in a Member State of the EEA in circumstances which require the publication of a prospectus under the Prospectus Regulation, such Notes will not have a denomination of less than €100,000 (or, in the case of Notes that are not denominated in euro, the equivalent thereof in such other currency). The relevant Issuer may also issue unlisted Notes and/or Notes not admitted to trading on any market. The Notes issued by ENEL will constitute “obbligazioni” pursuant to Article 2410, and the Articles that follow such Article 2410, of the Italian Civil Code, which relate to the issuance of “obbligazioni” by corporations in Italy. This Base Prospectus (as supplemented as at the relevant time, if applicable) is valid for 12 months from its date in relation to Notes which are to be admitted to trading on a regulated market in the EEA. The obligation to supplement this Base Prospectus in the event of a significant new factor, material mistake or material inaccuracy does not apply when this Base Prospectus is no longer valid. The Notes and the Guarantee have not been, and will not be, registered under the U.S. Securities Act of 1933, as amended (the “Securities Act”), or with any securities regulatory authority of any state or other jurisdiction of the United States, and the Notes may include bearer notes that are subject to U.S. tax law requirements. Subject to certain exceptions, the Notes and the Guarantee may not be offered or sold or, in the case of bearer notes, delivered within the United States or for the account or benefit of U.S. Persons (as defined in Regulation S under the Securities Act (“Regulation S”)). The Notes will be offered and sold in offshore transactions to non-U.S. persons outside the United States in reliance on Regulation S under the Securities, in transactions exempt from the registration requirements of the Securities Act. For a description of these and certain further restrictions on offers, sales and transfers of Notes and distribution of this Base Prospectus see “Subscription and Sale and Selling and Transfer Restrictions”. The relevant Issuer and the Guarantor (where ENEL is not the relevant Issuer) may agree with any Dealer that Notes may be issued in a form not contemplated by the Terms and Conditions of the Notes herein, in which event a Drawdown Prospectus (as defined below), if appropriate, will be made available which will describe the effect of the agreement reached in relation to such Notes. ENEL’s long-term debt is currently rated “BBB+” (stable outlook) by S&P Global Ratings Europe Limited (France Branch) (“S&P”), “A-” (stable outlook) by Fitch Italia S.p.A. (“Fitch”) and “Baa2” (positive outlook) by Moody’s France S.A.S. (“Moody’s”). Each of Moody’s, S&P and Fitch is established in the European Union (the “EU”) and registered under Regulation (EC) No.1060/2009 (as amended) (the “CRA Regulation”) and as such is included in the list of credit rating agencies published by the European Securities and Markets Authority (“ESMA”) on its website (at http://www.esma.europa.eu/page/List-registered-and-certified-CRAs) in accordance with the CRA Regulation.