Duplicate electricity production group in hybrid offshore wind

[mabijkerk]

Problem

The hybrid offshore wind system's cable nodes are incorrectly included in the electricity_production group, causing electricity from hybrid offshore wind to be counted twice in queries that sum all electricity production.

Root Cause

The following nodes are in the electricity_production group but should not be:

• energy_power_hybrid_from_offshore_network_electricity
• energy_power_hybrid_to_offshore_network_electricity

These nodes are transportation nodes that route electricity between the offshore network and onshore HV network for merit order purposes. They do not produce electricity themselves - they only pass through electricity already produced by energy_power_hybrid_wind_turbine_offshore or on land.

Impact

Queries that use V(G(electricity_production), output_of_electricity).sum (like total_electricity_produced) double-count hybrid offshore wind electricity:

1. Once from the actual wind turbine
2. Once from the passthrough node

This causes total_electricity_produced to be higher than the sum of carrier-based production queries, since carrier queries correctly filter by fuel input (e.g., wind_input_conversion > 0.0) and therefore exclude the passthrough nodes.

Solution

Remove electricity_production from the groups attribute in:

• /graphs/energy/nodes/energy/energy_power_hybrid_from_offshore_network_electricity.ad
• /graphs/energy/nodes/energy/energy_power_hybrid_to_offshore_network_electricity.ad

We should verify that there is no fallout from removing these nodes from the group.