Adaptation to eGon-data's Updated Power Capacity Specification for Gas Power Plants

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Objective

This issue aims to prepare eTraGo for the forthcoming changes in the eGon-data repository regarding the power capacity specification of OCGT and other CHP gas power plants. Once the related issue in the eGon-data repository is resolved, eTraGo will need adjustments to maintain compatibility and ensure accurate processing of power plant data.

Background

The eGon-data repository is addressing an inconsistency in how power capacities are specified for OCGT and other CHP gas power plants. Specifically, eGon-data will standardize the representation of power capacities across all gas power plants, affecting how these capacities are interpreted and utilized in grid optimization models within eTraGo.

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When importing generators from links with the import_gen_from_links function the efficiency should be respected which is not the case at the moment. This should also be changed. E.g.:

gas_to_add.p_nom *= gas_to_add.efficiency could be added here.