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This is what happens to your data once it arrives. The computation is fully deterministic — the same input always yields the same schedules. For each quarter-hour t of the delivery day:
1

Net position per control area

Positive = long/surplus, negative = short/deficit.
2

Open position per control area

Positive = must buy, negative = must sell.
3

Total German open position

This is the volume the trader executes on the EPEX day-ahead auction. It is delivered (via ECC) into the home balancing group.
4

Distribution transfers

Each transfer is a matched pair: an out trade in the home group’s schedule and an in trade in the target group’s schedule.
5

Schedule assembly

Every balancing group gets a schedule containing its production forecast, its consumption forecast and its trades, with trades aggregated per direction and counterparty (non-negative values; a negative quantity flips to the opposite direction).

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Why every schedule sums to zero

The home group receives the full EPEX volume and passes on exactly the non-home shares, keeping its own:
Expressed on schedule components: production − consumption + trades = net + trades = 0.

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Guaranteed properties

Two properties hold for every delivery day, and are verified continuously against randomised data for every choice of home area and all three day lengths (96 / 92 / 100 intervals):
  1. Every balancing-group schedule sums to zero at every quarter-hour.
  2. The net transfer out of the home group equals the sum of the other areas’ open positions — nothing is created or lost in the distribution.

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When the auction fills differently

The requested and the executed EPEX volume are not assumed to be identical. If the trader’s fill deviates from the requested open position:
  • the transfers to the other control areas stay unchanged — their needs are their needs,
  • the home balancing group absorbs the difference, and the residual is recorded per quarter-hour as a visible imbalance rather than being silently discarded.