SBS
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No, GTS has only a prognosis value for the coming hour.
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Yes, a separate download has been provided for the zones (which indicates zones for one or more gas days). It is correct that in the SBS download, this zone info only shows the applicable zone. The specs for the separate zone message are given under the message specifications on the website (GTS_InformationServices_R1).
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The message that will be constructed has the following format:
GTS WDM Order Forecast at: <xx:05>/<xx:10> LET - GTS <buys>/<sells>
Product: <single hour>/<remainder of day>
Amount per hour: <value> MW/h
Total amount: <value> MWh
SBS forecast value: <+/-value> MWh