Marinus Link gets nation’s first offshore transmission licence - Energy Source & Distribution

Marinus Link, the proposed submarine high-voltage cable between Tasmania and Victoria, has been granted Australia's first offshore transmission licence. The project aims to move renewable energy from Tasmania's wind and hydro generation to the mainland grid.

Where this fits

Marinus Link is a direct consequence of Australia's reliance on weather-dependent renewables. The cable itself is not the cost problem, it is a symptom of one. A grid dominated by solar and wind requires vast new transmission infrastructure to move power from generation sites (often remote) to demand centres, at distances and scales that a firm, co-located nuclear plant would not demand. The licence grants regulatory approval, but the capital cost and timeline remain subjects of contention. This is the transmission overbuild the whole-system cost analysis must include: it is not optional, it is structural to a renewables-only path.

What it means

Australia is investing heavily in transmission to patch the spatial mismatch between where renewables are built and where demand sits. That capital, and the years of construction delay, could have been spent on firm generation sited closer to load, reducing transmission bottlenecks and grid stress. The cable also deepens reliance on a single interstate interconnector during critical supply events, a single point of failure in an already weather-fragile system. Tasmania's hydro cannot be relied upon in dry years; the backup will be gas imports from the mainland. Marinus Link solves a transmission puzzle, not the intermittency puzzle underneath it.