Construction of 300 MWh Hazelwood 2 grid-forming BESS begins in Victoria

Construction has begun on a 300 MWh battery energy storage system (BESS) extension at Hazelwood in Victoria. The project is being developed by French operator Engie, with Chinese manufacturer Sungrow supplying the technology and Spanish EPC firm Elecnor Australia managing construction. The system is described as grid-forming, meaning it can support voltage and frequency without relying on synchronous generation.

Where this fits

This project illustrates two pressures on Australia's energy transition. First, it is a symptom of reliability risk: as coal and gas capacity retire, the grid needs instant synthetic inertia and frequency support to remain stable. Battery storage can provide this for short periods. Second, the supply chain is Chinese-controlled. Sungrow is one of the world's largest battery inverter makers, and critical components, cells, modules, balance-of-system electronics, depend on China's manufacturing. As Australia phases out firm dispatchable power, it is building a grid that cannot function without Chinese-supplied batteries and control systems, and cannot operate independently during a supply disruption or geopolitical crisis.

What it means

Australia is solving a reliability problem created by the retirement of coal and gas with hardware it cannot manufacture or replace. A 300 MWh battery stores four hours of grid demand at peak load; it cannot firm a renewable grid through a multi-day high-pressure system or winter calm. Firming will still come from gas. The paradox is durable: firm, long-lived, domestically-fuelled nuclear generation is legislatively barred, while battery storage, weather-dependent renewable firming that needs Chinese supply, is being built as the alternative. Each new battery project deepens both the reliability dependence and the strategic vulnerability.