South Australia Pushes Grid Closer to 100% Renewables

South Australia has achieved another big milestone in renewable energy, running its grid with just one gas turbine for system stability, instead of two. The state is showing how batteries and inverter-based technologies can replace fossil fuels for grid security.

Key Highlights

• One Gas Unit Left – Torrens B3 gas turbine was the only synchronous generator running, at just 40 MW.

• Wind Power Dominates – On the night of the test, wind supplied nearly 90% of state demand.

• Battery Power Rising – More than 50 large batteries (up to 850 MW, 3,000+ MWh) are planned across Australia.

• Syncons Helping Stability – Four synchronous condensers installed in SA reduce dependency on gas units.

Why It Matters

• Frees up more space for wind and solar instead of fossil fuel generators.

• Proves batteries and inverters can deliver grid services like frequency control, inertia, and system strength.

• Supports SA’s target of 100% net renewables by 2027.

Challenges Still Ahead

• Rooftop Solar Growth – With 50% of households using rooftop solar, demand sometimes falls below zero.

• Daytime Caveat – At least two gas units still needed if demand drops under 600 MW.

• Testing Needed – AEMO confirms more physical tests required before going fossil-free entirely.

The Bigger Picture

• South Australia already averages 75% renewable power annually – the highest in the world for a grid of its size.

• The upcoming EnergyConnect link to NSW will allow more exports, imports, and grid stability.

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