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

December, 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 No. 0114

Santiago, December 17, 2015

Ger. Gen. No. 197/2015

Mr. Carlos Pavez T.

Superintendent of Securities and Insurance

Superintendence of Securities and Insurance

Av. Alameda Bernardo O’Higgins No. 1449, Floor 12.

                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”), I hereby inform you of the following significant event:

Today, the management of Endesa Chile received correspondence from its controller, Enersis, which is attached to this document, indicating the binding commitments of Enersis and its controller Enel S.p.A., regarding the Corporate Reorganization process. The aforementioned document from Enel is also attached.

Sincerely yours,

Empresa Nacional de Electricidad S.A.

Valter Moro

Chief Executive Officer

c.c.       Fiscalía Nacional Económica (Antitrust Authority)

             Banco Central de Chile (Central Bank of Chile)

             Bolsa de Comercio de Santiago (Santiago Stock Exchange)

             Bolsa Electrónica de Chile (Electronic Stock Exchange)

             Bolsa de Corredores de Valparaíso (Valparaíso Stock Exchange)

             Banco Santander Santiago –Representantes Tenedores de Bonos (Banco Santander Santiago - Bondholders Representative)

             Depósito Central de Valores (Central Stock Depositary)

             Comisión Clasificadora de Riesgos (Risk Classification Commission)