Include additional nodes in electricity curtailment

[kndehaan]

Issue opened as a followup of the efforts and discussion points in https://github.com/quintel/etsource/pull/2876.

Apart from the 'main' curtailment node, energy_flexibility_curtailment_electricity, additional electricity curtailment nodes have been added over the past few years:

• energy_battery_curtailed_solar_electricity
• energy_battery_curtailed_wind_electricity
• energy_hydrogen_curtailed_electricity
• energy_power_hybrid_curtailed_electricity

In our primary demand queries however, we still regularly only query the main curtailment node. This should be solved querying including all curtailment nodes, for instance by adding a curtailmaint_group and querying this group rather than the main node.

To solve this issue, it should be defined which curtailment nodes should be included here and how the curtailment nodes will be queried. Some points of discussion:

• Querying the integrated battery curtailment is debatable, it depends where you want to allocate primary demand i.e. which flows you want to make explicit
• Direct electrification curtailment is likely implemented because the input capacity of the electrolyser is not dimensioned to exactly fit the output capacity of the solar/wind
• Querying the direct electrification curtailment is debatable, similar to the integrated battery curtailment, the question is whether you want to allocate primary hydrogen demand or allocate primary electricity

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