Informational RSS feed for IT changes

XML message formats for electricity and gas valid from 01/24/2023

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Temporary shutdown of the Sandbox test environment

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Notice of Temporary Unavailability of the Test Environment on 08/08/2025

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Temporary unavailability of the OTE system on 15 November 2023

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Information on discontinuing support for Internet Explorer 11

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Temporary unavailability of the Sandbox test environment

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Reminder: Certificate Renewal for Communication with CS OTE

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The time change on October 26th 2025

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Termination of SANDBOX-15min test environment on 27th of September2024

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Temporary Unavailability of the Sandbox Testing Environment

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Planned OTE Systems Outage 26 May 2026

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Only commercial certificates will be supported by web services under TLS.

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S/MIME Certificate renewal and web services security certificate renewal for test environment

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CS OTE irregular shutdown on April 1st, 2026

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Information Webinar - Testing the transition to a 15-minute settlement period

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As a reminder, only commercial certificates will be supported under TLS for web services.

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Temporary Unavailability of Sandbox Test Environments

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Final Version XML Message Formats, XSD Templates

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The extraordinary shutdown CS OTE Sandbox1 on March 27, 2026

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Update of the Documents Related to the Implementation of 15-min. Imbalance Settlement and Trading Periods

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XML message formats, XSD templates for suggestions

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XML Message Formats, XSD Templates for suggestions

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Temporary unavailability of OTE on 14 November 2023

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Current version of the manual of message formats XML, XSD and WSDL templates for electricity valid from 07 June 2022

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Thawte SSL/TLS certificate renewal information

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REMINDER: Renewal of the CS OTE auth certificate 12 May 2026 at 15:00

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