National Grid metered half hourly electricity demands including pump storage demand and generation, Moyle interconnector flows and French interconnector follows. Including a list of generators metered to make up the total demand.

The half hourly demands are given in the following formats:
1. INDO – Published BMRA Initial Demand Outturn based on National Grid operational generation metering. EXCLUDES Station Load, Pump Storage Pumping and Interconnector Exports.  This can be compared against the BMRA 08:45 DF.  The list of Generators is in the BMU_List sheet.
2. E&W - For legacy users this is a continuation of what would be Pre-BETTA INDO.
3. IO14_DEM - This is calculated from Elexon SO_IO14 generation data.  It is the sum of the same generation meters as INDO.  The Station load value has NOT been subtracted (500MW in BST and 600MW in GMT).
4. IO14_TGSD -Total Gross System Demand calculated from Elexon SO_IO14 generation data and INCLUDES Station Load, Pump Storage Pumping and Interconnector Exports.  This can be compared to DF forecasts apart from the 08:45 issue.