No. Current official estimates for Australia's renewable energy transmission costs are in the tens of billions, not trillions.

AEMO's Draft 2026 Integrated System Plan (ISP) projects around $9 billion for new transmission infrastructure by 2050, representing about 7% of total capital costs. The total system overhaul (including generation, storage, and transmission) is estimated at $128 billion, with transmission making up a small fraction of that.

While transmission project costs have risen sharply—25–55% for overhead lines and 10–35% for substations since 2024—these increases are still measured in billions, not trillions. Some critics argue costs are higher than initial estimates, but no authoritative source supports a trillion-dollar figure.