Terna Energy S.A.

Interest Rate Update/Notice • Oct 14, 2025

Athens, October 14, 2025

12th Interest Payment Period of Common Bond Loan

According to the terms of the common bond loan dated 22.10.2019 (the "Bond Loan") issued by "TERNA ENERGY FINANCE SA" (the "Company"), the record date for determining the beneficiaries entitled to interest on the Bond Loan for the 12th Interest Payment Period, i.e. from 22.04.2025 to 22.10.2025, is Tuesday, October 21, 2025.

It is therefore clarified that as of Monday, October 20, 2025 (Ex-coupon date) the Company's bonds in relation to the Bond Loan will be traded on the Athens Exchange without the right to receive the interest payment associated with the 12th coupon.

The gross interest amount for the 12th Interest Payment Period, which corresponds to 150,000 bonds currently traded on the Athens Exchange, amounts to euro 1,982,500.00 i.e. euro 13.2166666667 per bond and has been calculated at an annual interest rate of 2.60% (before tax).

The payment of the accrued interest to the bondholders will take place through the "Hellenic Central Securities Depositary S.A." (the "ATHEXCSD") on Wednesday, October 22, 2025, as follows:

• 1. Through the operators of the beneficiaries in the D.S.S (Banks and Securities firms) for the bondholders that have authorized their operators for the collection, according to the D.S.S. Operations Regulation and ATHEXCSD relevant resolutions.
• 1. Especially in cases of interest payments to heirs of deceased beneficiaries whose titles are kept in the Special Account of their Share in D.S.S., under the management of ATHEXCSD according to Article 15 of the D.S.S. Operations Regulation, the payment of the interest to the legal heirs will be made a) through ATHEXCSD within one (1) year from the date of payment of interest, and b) through a cash deposit in the Deposits and Loans Fund (TPD) after the lapse of one (1) year. "

It is clarified that according to the currently applicable legislation, the right to collect interest expires within the time limit of five (5) years and any amounts not collected shall be conclusively reimbursed to the Hellenic Republic.