The fire spread within the first battery and then to the adjacent battery, it said in the review, which relied on a Tesla investigation, an examination of the scene, video footage and data from the incident.
The battery site — one of the largest globally — is designed to store energy produced by renewables and send power to the grid.
The state regulator said it had told Tesla that it had “no objection” to work resuming on commissioning the Victoria Big Battery project, built by French renewable energy firm Neoen using Tesla batteries.
Following the technical review, Energy Safe Victoria said it would now determine if there were any safety breaches and, if so, decide on any enforcement action.
The safety regulator said Tesla must provide the final results of its own investigation into why the fire spread to the second battery.
It said both Tesla and Neoen had cooperated in the probe.
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