GreeceEnergy engineering servicesOpen Energy-upgrade study and tender design for the 308 PEB Ανώτατη Στρατιωτική Διοίκηση Ηπείρου-Μακεδονίας / NRDC-GR, Ταξιαρχία Μηχανικού Submission deadline October 16, 2026 Time not stated Contract value Not stated in the notice