The project supported 200 jobs during its construction phase. Credit: Scharfsinn / Shutterstock.

The state government of Western Australia (WA) has completed the second phase of the Kwinana big battery project, a significant step in the region’s energy transition.

Phase two involved the construction of the A$661m ($428m) Kwinana battery energy storage system (BESS), which comprises 288 battery modules and 72 inverter units and has an 800-megawatt hours (MWh) storage capacity and 200MW output capability.

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Construction of the project, which began in July 2023, has supported 200 jobs.

This development is timely as WA’s main electricity grid recently achieved a renewable energy milestone, with renewables supplying 85.1% of energy on the South West Interconnected System on 17 November 2024.

Since 2017, the WA government has more than doubled the share of renewable energy on the grid, from 14% to 34% in 2023.

The investment in battery systems such as the Kwinana project is crucial for WA to increase its renewable energy contribution, particularly from rooftop solar, ensuring affordable and reliable energy for the state.

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Synergy’s two big batteries in Kwinana will have the capacity to supply power to 450,000 households for up to four hours, covering Perth and surrounding areas.

These batteries complement Neoen’s 560MW/2,240MWh battery unit in Collie and the Cook government’s Collie BESS, which becomes operational in 2025.

The Cook Labor government is investing A$5.4bn ($3.4bn) to facilitate WA’s energy transition – a significant commitment to sustainable power infrastructure.

WA Premier Roger Cook stated: “Our clean energy plan is setting up WA for the future and locking in affordable and reliable energy for every Western Australian.

“We’re smashing renewable energy records because of our Labor government’s significant investment into the energy transition.

“The Kwinana big batteries will play a vital role in keeping our energy system reliable and stable, allowing us to bring on more renewable energy and sensibly phase out coal by 2030.”