Acea — Proxy Solicitation & Information Statement 2026

May 21, 2026

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Rome, 21 May 2026 – Acea announces that the shareholder Roma Capitale, holder of 108,611,150 ordinary shares, representing 51% of the share capital, presented, pursuant to current legislation, the pro on item 5 “Determining the number of members of the Board of Directors” and on item 8 “Determining the fees for the members of the Board of Directors” on the Agenda of the Company’s Shareholders’ Meeting, called for 3 and 4 June 2026, on first and second call respectively.

This proposal is available to the public at the Company’s registered office, in the specific section of the Company’s website (www.acea.it, section “2026 Annual General Meeting”) and on the authorised storage mechanism , available at .

Acea SpA

Corporate Affairs

Tel. +39 06 57991

AdempimentiSocietariCorporate@aceaspa.it

Press Office

Tel. +39 06 57997733 - email: ufficio.stampa@aceaspa.it

Company website: www.acea.it