Capacities in the intraday system are provided by the TSOs. The cross-border capacities are handled implicitly, i.e. local order book views take into account capacities that are allocated by the different TSOs on each border. This means that cross-border trades will only be possible if there is enough allocated capacity between the areas.
Intraday capacities are determined by the relevant TSOs after the flow results of the day-ahead auction. The exact timing of capacity allocation varies and depends both, on operational procedures and individual agreements between the TSOs on the different borders. Approximate capacity allocation timings are shown below.
|Nordic/Baltic||ca. 14:00 CET|
|Kontek (DK2<->50 Hertz)||ca. 16:30 CET|
|NorNed (NO2<->TenneT NL)||ca. 21:00 CET|
Intraday capacities are updated automatically, depending on the volume and direction of ID trades. Capacities can further be changed directly by the TSOs as a result of operational issues, e.g. an outage on a transmission line.
Like in the day-ahead auction ramping restrictions apply in the Intraday market. As a result the entire remaining capacity after the day-ahead auction may not be available for the market on ramped connections. A thorough description of ramping restrictions can be found here.