The electricity volumes of the four transmission system operators (TSOs) are calculated as the difference between the volume forecast and traded in the auctions and the feed-in expected from the intraday short-term forecast.
If the transmission system operators acquire electricity positions via continuous intraday trading, this is reported as a positive electricity volume; if, on the other hand, they sell electricity positions via continuous intraday trading, this is reported as a negative electricity volume.
Please note that prior to January 1, 2015, only hourly publication of the values was planned. Accordingly, the data contains four identical quarter-hourly values.