Question juridique clé
Whether the federal appeal against the preliminary siting permit decision was admissible under Art. 93 LTF.
Solution extraite
The appeal did not show a legally relevant irreparable prejudice and did not satisfy the heightened reasoning requirements for an exceptional immediate appeal against an incidental decision.
Motifs extraits
A preliminary siting permit is an incidental step toward the building permit; the appellant argued as if the permit were final and failed to explain the immediate harm caused by postponing the Art. 75b Cst. issue to the final permit stage.