The half-hour average MW expected generation in each Settlement Period calculated as the sum of all Physical Notifications for that Settlement Period prevailing at the time of the forecast and for BM Units for which the Physical Notifications are positive, i.e. will be exporting energy. Data supplied by the System Operator for the day ahead and current day (a number of times each day) for publication on the BMRS, comprising the Indicated Generation for each System Zone and Settlement Period and the national Indicated Generation for each Settlement Period.