Question juridique clé
Whether Swissgrid had to bear the Federal Administrative Court costs despite not filing a main request in the appeal proceedings.
Solution extraite
Yes. Swissgrid was a necessary opposing party because the annulment of the tariff item reduced its revenues and made it the losing party in substance.
Motifs extraits
Party status and cost liability depend on the substantive effect of the appealed decision, not on whether the party formally filed requests. A party whose tariff income is reduced by the appeal outcome is treated as unsuccessful.