Cross-border transmissions


The Czech transmission system is surrounded by five neighbouring Transmission System Operators (50Hertz, TenneT, PSE, SEPS and APG). Interconnectors, which link the Czech transmission system with those of neighbouring countries, are used for international electricity trading and System Operator - System Operator electricity transmission (so called So-So trades). Transmission system operators are responsible for the coordinated calculation and allocation of cross-border transmission capacity for international electricity trading as well as for congestion management in compliance with EU legislation.

Bottlenecks sometimes occur on the ČEPS interconnectors due to an excess of demand over actual transmission capacity. The process of allocation of transmission capacities available for trading is held by yearly, monthly and daily auctions (with the exception of the ČEPS/SEPS interconnector and intraday capacity allocation, where the First Come First Serve principle is applied. Transmission capacities are offered as secured for the whole given period excluding Prevention of state of emergency, cases defined by Article 24 of Act 458/2000 and excluding cases stated by auction/allocation rules.


Yearly, monthly and daily transmission capacities 

  • ČEPS/TenneT, ČEPS/50HzT, ČEPS/PSE and ČEPS/APG interconnectors
    The Joint Allocation Office S.A. (JAO) is responsible for the yearly, monthly and day ahead allocation of cross-border capacities. Information on coordinated auctions and auction rules are available on the JAO website.
  • ČEPS/SEPS interconnector Transmission capacity reservation for long-term cross-border transfer is not required for the ČEPS/SEPS interconnector.
    The coupling of the respective two day-ahead electricity markets, organised by the Market Operator (OTE) in the Czech Republic and OKTE in Slovakia, by HUPX, Zrt. in Hungary and OPCOM S.A. in Romania, makes it possible to satisfy requirements for electricity purchase or sale by registered participants in both the Czech, Slovak, Hungarian and Romanian markets for the following day by transferring electricity from the neighbouring market without tendering for available transmission capacity by means of implicit auction. This is possible up to a certain transmission capacity limit set for the coupled markets involved. More detailed information relating to electricity trading on the ČEPS/SEPS interconnector is available on the websites of both market organisers: and http// /


NTCs for monthly auction - results by ČEPS, a.s.

NTCs for yearly auction 2017 - results by ČEPS, a.s.


  • In case of Decoupling in regard to the trilateral CZ-SK-HU-RO market coupling cross-border transmission capacity for the CZ-SK border will be allocated through the explicit capacity auction (Shadow Auction). The Shadow Auction of cross-border transmission capacities, organized by ČEPS in the Damas Energy system for the CZ-SK border runs in parallel with settlement of decoupled day-ahead markets. Rules for Shadow auctions can be found here.


Intraday allocation

The intraday allocation of available transmission capacity on interconnectors and the scheduling of cross-border transmission runs on all ČEPS interconnectors; ČEPS fulfils the role of the Transmission Capacity Allocator even for those interconnectors which do not directly fall into the ČEPS market area (PSE/50HzT, PSE/SEPS, MAVIR/APG and SEPS/MAVIR).

Capacity is allocated via the Damas Energy system on the first come first serve principle, if there is enough transmission capacity to meet the requirements of the respective request - these capacities are free of charge. The nomination and matching of allocated capacities remains under the responsibility of the relevant transmission system operators.


Detailed information relating to the intra-day allocation of available transfer capacity on interconnectors is available here.


The scheduling of cross-border transmissions means the nomination of capacities allocated to a given market participant in a yearly, monthly and/or daily auction (with the exception of the ČEPS/SEPS interconnector) or via the continuous allocation of intra-day cross-border capacity.

For the scheduling of cross-border transmissions ČEPS use the Damas Energy system; you can find detailed information on this system here.

Cross-border nomination process is harmonised within the CEE region. Detailed information regarding cross-border scheduling for all ČEPS control area borders (with the exception of daily scheduling on the ČEPS/SEPS interconnector) can be found here.