Informational RSS feed for IT changes
Notice of Temporary Unavailability of the Test Environment on 08/08/2025
Temporary unavailability of the OTE system on 15 November 2023
Information on discontinuing support for Internet Explorer 11
Temporary unavailability of the Sandbox test environment
The time change on October 26th 2025
Termination of SANDBOX-15min test environment on 27th of September2024
Temporary Unavailability of the Sandbox Testing Environment
Only commercial certificates will be supported by web services under TLS.
S/MIME Certificate renewal and web services security certificate renewal for test environment
CS OTE irregular shutdown on April 1st, 2026
Information Webinar - Testing the transition to a 15-minute settlement period
As a reminder, only commercial certificates will be supported under TLS for web services.
Temporary Unavailability of Sandbox Test Environments
Final Version XML Message Formats, XSD Templates
The extraordinary shutdown CS OTE Sandbox1 on March 27, 2026
Update of the Documents Related to the Implementation of 15-min. Imbalance Settlement and Trading Periods
XML message formats, XSD templates for suggestions
XML Message Formats, XSD Templates for suggestions
Temporary unavailability of OTE on 14 November 2023
Current version of the manual of message formats XML, XSD and WSDL templates for electricity valid from 07 June 2022
Thawte SSL/TLS certificate renewal information
REMINDER: Renewal of the CS OTE auth certificate 12 May 2026 at 15:00
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