REN-Redes Energeticas Nacionais

Regulatory Filings • May 31, 2019

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.

ANNOUNCEMENT

In accordance with and for the purposes of article 17 of the Regulation (EU) No 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 regulations, REN – Redes Energéticas Nacionais, SGPS, S.A. ("REN" or the "Company") informs the market and the public in general of the following:

Today, the Portuguese Energy Services Regulatory Authority ("ERSE") made public the final documents regarding the "Tariffs and prices for natural gas for the 2019- 2020 gas year and parameters for the regulatory period between the years 2020 and 2023".

In the particular case of REN, the documents now made public do not introduce any material changes when compared with the proposal presented by ERSE on the past 1 April, through the technical note with the main regulatory parameters, announced by REN to the market at such date.

Lisbon, May 31, 2019

REN – Redes Energéticas Nacionais, SGPS, S.A.

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