Glossary Term: Initial Transmission System Demand Out-Turn
The average megawatt value of demand for a Settlement Period including transmission losses, station transformer load, pumped storage demand and interconnector demand.
The ITSDO is made available by the System Operator within 15 minutes after a Settlement Period, based on their operational metering. The composition of the Initial Transmission System Demand Out-Turn matches that of the Transmission System Demand Forecast and so are comparable.