The Waratah Super Battery has reached full completion. Final sign-off came late last week after commissioning tests on a replacement transformer, per RenewEconomy (September 28, 2026).

The battery is rated at 850 megawatts (MW) and 1,680 megawatt-hours (MWh). Built and owned by Akaysha Energy, it now has Australian Energy Market Operator approval to operate at full capacity, per RenewEconomy.

NSW energy minister Penny Sharpe announced the milestone Monday morning. "The Waratah Super Battery is a game changer for NSW," she said. "As ageing coal-fired power stations retire, this project will help keep the lights on for homes and businesses while enabling more renewable energy to flow through the grid."

The battery is the most powerful machine of any type connected to the Australian grid. It acts as a giant "shock absorber" under a 700 MW Security Integrity Protection Scheme (SIPS) grid-security contract, per RenewEconomy and Energy-Storage.News.

The project was due 18 months ago, after construction issues, a late-2025 transformer failure, and the collapse of its battery supplier, per RenewEconomy. It drew over AU$1 billion (~US$690M) in private investment and about 1,000 workers, per Energy-Storage.News. The completion marks a major step for grid-scale storage in Australia.