Thredbo HV Ring Main Upgrade

Project overview

Thredbo Alpine Resort is operated by EVT within Kosciuszko National Park. The HV Ring Main and Communications Infrastructure Upgrade runs along the Kareela summer road from Eagles Nest to the Sponars T-Bar and Gunbarrel chairlift top station. The works include a ring main unit switching station and two new unit substations connected to the existing Essential Energy network at cutover.

Flomar is delivering the civil and electrical-enabling package on the operating mountain, including the underground route, substation civils and cable installation. Directional drilling, HV jointing, terminations and fibre testing are carried out with specialist partners.

Flomar's scope of works

• Survey set-out, service locating, non-destructive vacuum potholing and pre-construction dilapidation surveys
• Open trenching along the Kareela summer road, with bedding, protective covers, warning tape, backfill, compaction testing and reinstatement
• Reduced-depth, concrete-protected trench crossing at the Sponars culvert and the trench to the switching station
• A single 192m Zone 3 directional drill with a specialist drilling partner, carrying two HV conduits and one empty spare communications conduit, including entry and exit pits, drilling-fluid management, conduit welding, pullback and annulus grouting
• Seven communications pits, two cable joint bays and an extension of the communications route
• Civil works for the switching station and two unit substations, including excavation, precast culverts and plinths, earthing, bollards and non-metallic fencing
• Installation of client-supplied 11kV XLPE cable and the communications route, with HV jointing, terminations and fibre testing by specialist partners, plus testing and commissioning support for the Essential Energy cutover
• Progressive rehabilitation, work-as-executed and GIS survey pickups, quality handover documentation and demobilisation