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A review of the Yallhourn power plant fire found that someone had intentionally overloaded a circuit breaker.
The conflagoration began shortly after the company locked out Construction Forestry Mining and Energy union workers.
Sen-Det Catlan Chwell said, "There has been an independent review by external agencies and that has given us some evidence [that the fire ignited from] an overload to a circuit breaker."
Police believe this was an act of sabotage and not an accident.
"Whoever was responsible for this specific action, it was potentially life threatening for themselves," said Chiswell.
Three generators were shut down as a result of this fire.