The electricity volumes of the four transmission system operators (TSOs) result from the difference between the volume forecast and marketed on the previous day and the feed-in expected from the intraday short-term forecast.
If grid operators purchase electricity positions via intraday trading, this is shown as a positive electricity volume, whereas if they sell electricity positions via intraday trading, this is shown as a negative electricity volume.
Please note that prior to 01.01.2015, only hourly publication of the values was planned. Accordingly, the data contains four equal quarter-hourly values.