Dear partners,

 In connection with the forthcoming introduction of the 15-minute settlement period in the Czech Republic on 1 July 2024, we would like to inform you that on 18 March 2024, we will start testing with market participants. In the first phase, these are E2E tests of the new universal 15/60min interface for data transmission via CDSDATA format - E2E tests - transmission of measured data (profile data in 15 min).

We hereby request market participants to prepare for testing in the test environment of the market operator Sandbox by Friday 23 February 2024. This is primarily to check the market participant's access to the Sandbox, i.e. all users and their certificates. The testing itself will take place on the newly created Sandbox 15min environment (designed for testing data at 15min.granularity), to which the data concerning the access of all users and their access certificates from the existing Sandbox will be automatically transferred after 23/02/2024. No further automatic transfer of data from the "hourly" Sandbox to the "15-minute" Sandbox is planned.

We recommend that all users wishing to participate in the testing register for the Sandbox or secure access certificates to the Sandbox by Friday 23 February 2024. After this date, the registration of users and their access certificates to both test environments will have to be handled by the relevant registered market participant.

Further information is available on the market operator's website: Information to switch to 15 min. interval — English (ote-cr.cz)

In case of any questions regarding registration for the Sandbox test environment, please contact services@ote-cr.cz.

For questions about the testing itself, please contact elektro@ote-cr.cz.