REN-Redes Energeticas Nacionais

Regulatory Filings • May 18, 2021

Unofficial Translation This is an unofficial translation of the proposal indicated below and it has been prepared for information purposes only. In the event of any discrepancy between this translation and the Portuguese version, the Portuguese version will prevail.

COMMUNICATION

Pursuant to and for the purposes of article 17 of Regulation (EU) number 596/2014 of the European Parliament and of the Council of 16 April 2014, of article 248-A of the Portuguese Securities Code and other applicable regulation, REN – Redes Energéticas Nacionais, S.G.P.S., S.A. ("REN") hereby informs the market and the general public that it has received today from its shareholder OQ S.A.O.C. the attached communication.

REN – REDES ENERGÉTICAS NACIONAIS, SGPS, S.A.

Lisbon, May 18 th 2021

REN – REDES ENERGÉTICAS NACIONAIS, S.G.P.S., S.A. Listed Company (Sociedade Aberta) Head Office: Avenida Estados Unidos da América, nº 55, 1749-061 Lisbon Share Capital: € 667,191,262 Commercial Registry Office of Lisbon: registry and tax sole number: 503 264 032

COMMUNICATION

OQ S.A.O.C. ("OQ") hereby informs the market that it has formed the intention to sell its indirect participation in REN – Redes Energéticas Nacionais, SGPS, S.A. ("REN"), and that it has engaged financial and legal advisors to assist in the preparation of such intended sale through a private placement.

At this point no specific process has been initiated and OQ is still considering the format in which a disposal may take place.

Furthermore, it should be noted that although an intention has been formed, no formal decision has been made as to the sale itself or the conditions in which it may be implemented. Thus, any sale of OQ's indirect participation in REN is subject to internal approval processes and to the adequate market conditions being deemed by OQ to be in place.

In case a sale is completed and a participation in REN is no longer attributed to it, OQ shall inform the market pursuant to the terms set out in the Portuguese Securities Code and applicable regulations.

Oman, 18 May 2021 For OQ S.A.O.C. Al Muthir Al Kharusi Leader of IPO Readiness and Integration Management Office