Due to technology upgrade SAP, there will be an operational shutdown of the CDS system within CS OTE.  

System shutdown procedure

The shutdown will begin on Friday, March 27, 2026, at 3:30 p.m., during which the CDS system (application and communication server for electricity and gas) will be shut down. The CDS, Claims section for electricity and gas (including subordinate items) and the Gas Nomination section will be shut down within the OTE portal. The shutdown is expected to end on Saturday, March 28, 2026, at approximately 10:00 a.m. We will announce the end of the shutdown and the restoration of the market operator's information system via the news page on the main page of OTE portal. After the shutdown, the system will be fully functional. Due to the expected time of system restoration and delayed receipt of metering data, the results of imbalances for the delivery day of March 27, 2026, may be published later on March 28, 2026.

Impact on individual entities during the shutdown

Supplier and balance responsible party (in electricity and gas)

In the CS OTE Information System, no queries for data from the CDS system, i.e., metering data, billing data, imbalance results, and clearings, will be functional for electricity and gas. It will not be possible to submit requests for a change of supplier, handover the responsibility for imbalance at PDTs or to query the current status of these requests. 

Trading on short-term electricity and gas markets and sending realization diagrams for electricity will function without restriction.

In the gas industry, the receipt and processing of all types of nominations will be suspended.

Transport, distribution, and storage nominations - gas only

We ask balance responsible parties to send nominations for transmission, distribution, and storage for the gas day Saturday, March 28, 2026, to the relevant systems by 2:00 p.m. on March 27, 2026, at the latest. Renominations for gas transmission for the gas days March 27, 2026 and 28 March 2026 will only be possible via the transmission system operator's system from 3:30 p.m. on Friday until the end of the shutdown. Renominations for storage for the same gas days will only be possible via the system of the relevant gas storage facility operator during the outage. 

Nomination of bilateral contracts (delivery and withdrawal commitments) – gas only

We ask balance responsible parties, in case of need to renominate bilateral contracts during the shutdown for the gas day Friday, March 27, 2026, to contact OTE gas helpdesk at plyn@ote-cr.cz by 11:00 a.m. on March 28, 2026.