We would like to inform CS OTE users that CS OTE (including automatic communication and test environment - sandbox) will be unavailable on 25th October 2026 from 4:40 p.m. to 9:00 p.m. due to regular maintenance. During this maintenance we will apply changes on the basis of operation´s experience. Gas nominations entered into NET4GAS during an OTE maintenance have to be re/nominated.

Outage schedule:

• OTECOM trading app outage – 17:40 – 20:05h

• short outages of CS OTE portal 18:20 – 18:50h

Thank you for Your understanding and we apologize for any inconvenience.