AEMO notes ‘Release of Heywood limit from SA to Victoria’ on Friday 2nd October 2026

On 2 October 2026, AEMO released a 600 MW transmission constraint on the Heywood interconnector between South Australia and Victoria. The constraint had been held pending test results from June 2026. The release came one day after Project Energy Connect, a major new interconnector linking South Australia to New South Wales, went live. The 600 MW hold point is now implemented as a formal constraint set in the market.

Where this fits

This is a reliability story. Heywood and Project Energy Connect are both transmission links designed to move renewable output from South Australia into the eastern states. The staggered release of capacity, testing, hold points, staged commissioning, reflects the complexity of integrating high volumes of weather-dependent generation into a grid that must remain stable in real time. Each MW of interconnector capacity is an investment in moving variable power; the grid is being built to route solar and wind, not to firm it.

What it means

Australia is now dependent on a transmission infrastructure designed to carry renewable output across state lines. The sequential testing and constraint management shows the engineering difficulty of that task. More interconnectors mean more moving parts, more testing phases, and more operational complexity. The underlying issue remains unaddressed: solar and wind are weather-dependent, and no amount of transmission capacity changes that physics. A firm, energy-dense alternative like nuclear would require less transmission overbuild and less real-time constraint management, but remains legally barred.