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

April, 2015

Commission File Number: 001-13240

Empresa Nacional de Electricidad S.A.

National Electricity Co of Chile Inc

(Translation of Registrant's Name into English)

Santa Rosa 76,

Santiago, Chile

(56) 22630 9000

(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:

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):

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):

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:

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

SIGNIFICANT EVENT

Empresa Nacional de Electricidad S.A.

Securities Registration Record N° 0114

                                                                                                           Santiago, April 28, 2015
Ger. Gen. N°  067/2015

Mr. Carlos Pavez T.     
Superintendent of Securities and Insurance       
Superintendence of Securities and Insurance     
Av. Libertador Bernardo O’Higgins N°1449        
Santiago, Chile

            Ref.:     Significant Event

Dear Sir,

In accordance with articles 9 and 10, paragraph 2, under Securities Market Law N°18,045, and as established under General Norm N° 30 of the Superintendence, duly authorized on behalf of Empresa Nacional de Electricidad S.A. (“Endesa Chile” or the “Company”), I hereby inform you of the following significant event:

The Board of Director of Enersis S.A.(“Enersis”) has informed to Endesa Chile its approval  to begin the analysis of a corporate reorganization process, with the intention of separating electricity  generation and distribution activities in Chile from those outside of Chile held by Enersis and its subsidiaries Endesa Chile and Chilectra S.A. (“Chilectra”), keeping the companies in the Enel Group.

In its session held today, the Board of Directors of Endesa Chile  approved to begin the analysis of a possible corporate reorganization consisting of separating Endesa Chile for the segregation of businesses inside of Chile from those outside of Chile, and eventually merging the resulting companies into a sole company. The aim of this reorganization is to generate value for all of its shareholders.

None of these operations would require the contribution of additional financial resources by shareholders.

The Board of Directors agreed to study this possible reorganization taking into consideration both the Company’s best interest and those of all the shareholders, paying special attention to the interest of minority shareholders. If the reorganization is approved, it will be submitted for approval at an Extraordinary Shareholders’ Meeting.

The Company will duly inform the market of the progress of this initiative.

Sincerely yours,

Valter Moro

Chief Executive Officer

c.c.:         Distribution list

DISTRIBUTION LIST

c.c.:    - Superintendent of Pensions

            - Santiago Stock Exchange – General Manager

            - Electronic Stock Exchange – General Manager

            - Valparaiso Stock Exchange – General Manager

            - Fitch Chile Clasificadora de Riesgo Ltda. – General Manager

            - Feller Rate Clasificadora de Riesgo Ltda. – (Attn. Nicolás Martorell)

            - RiskClassification  Commission – General Management (Attn. Alejandro Muñoz)

            - Bondholders (Attn. Andrés Sepúlveda)

            - Depósito Central de Valores – General Manager

            - Sr. Fabio Bonomo

            - Sr. Jorge Ramos Filipa

            - Enersis S.A. – General Management

            - Enersis S.A. – Legal Counsel

            - Enersis S.A. – Audit Management

            - Enersis S.A. – Regional Finance Management

            - Enersis S.A. – Communications Management

            - Enersis S.A. – Compliance and Capital Markets Management

            - Endesa Chile – Administration and Finance Management

            - Endesa Chile – Regional Engineering, Projects and R&D&I Management

            - Endesa Chile – Communications Management

            - Endesa Chile – General Accountant

            - Endesa Chile – Legal Advisory

            - Endesa Chile – Assistant Management, Investor Relations

Endesa  - Teléfono (56-2)26309000 - Casilla 1557 - Correo Central - Santiago de Chile