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AUSTRALIA - TRANSMISSION LINES - eye 👁️ watering cost by 2050 for net zero . 1. Using historical overruns on complex Australian energy projects as a guide, applying a standard blowout to that $120 billion high-end baseline pushes the realistic total cost by 2050 to between $240 billion and $360 billion for the projected 10,000 kilometres of transmission lines by 2050 . 2. The total cost of building new high-voltage electricity transmission lines in Australia typically ranges between $3 million and $12 million per kilometre.
Due to severe global supply chain bottlenecks, rising steel prices, and the need to secure social licence from local farming communities, total project delivery costs have surged significantly over the last few years.
Typical Cost Ranges Per Kilometre
The total cost fluctuates depending on voltage capacity (e.g., 330kV vs 500kV), terrain complexity, and whether the line traverses rural or urban areas:
•Standard Rural Single-Circuit (330kV): $2.9 million to $4 million per km. This represents the historical baseline for open flat terrain before factoring in heavy environmental adjustments.
•Major High-Voltage Interconnectors (500kV): $10 million to $12 million per km. This has become the standard benchmark for massive interstate renewable grid projects, which require significant land acquisition and much larger steel lattice towers.
•Urban Transmission Lines: $5.6 million to $8 million per km. Squeezing lines through populated built-up zones drastically increases engineering and easement procurement costs. What is Included in the "Total Cost"?When a transmission company quotes a cost per kilometre, it represents a fully loaded asset cost rather than just the wires. The total incorporates: [1]
1Civil Engineering & Construction: Clearing paths, constructing heavy foundations, and assembling/erecting the massive steel lattice structures.
2Materials: Specialized high-voltage cabling, transformers, and raw steel.
3Easements & Social Licence: Direct financial compensation paid out to farmers, traditional owners, and landowners to legally secure the right-of-way corridor.
4Substation Integration: Building or upgrading the multi-million dollar terminal stations at each end of the line to feed power safely into the local distribution grid