The volume-weighted average price is determined from the last trades of the relevant quarter-hourly product that exceed a trading volume of 500 MW. In the event that a trading volume of 500 MW is not reached in a time interval for the quarter-hourly product, the last trades of the relevant hourly product are also taken into account in the index formation for this time interval to the extent required to reach a total trading volume of 500 MW. If less than 500 MW is traded in both products in total, no exchange price coupling takes place and the index is not defined. Further details can be found in the current model description.