South32 Files Lawsuit Against Siemens Over Alleged Software Flaw That Destroyed Turbine

South32 has initiated legal action against Siemens, alleging that a critical software flaw led to the destruction of a steam turbine generator at its Worsley Alumina operations in Western Australia.

The case, originally filed in 2021, stems from an October 2015 incident in which a turbine generator reportedly overheated during operation and was “effectively destroyed.” According to court filings, South32 claims the failure was caused by missing code in a programmable logic controller (PLC) responsible for safeguarding the generator.

The Federal Court judgment indicates that the absent code would have automatically triggered a circuit breaker, preventing the overheating event. South32 further alleges that Siemens failed to detect the issue during both initial implementation and subsequent software upgrades and safety inspections.

At the center of the dispute is also the question of accountability. Siemens has argued that the work in question was carried out by a separate corporate entity, Siemens Energy (formerly Siemens Industrial Turbomachinery), and therefore it should not be held liable for certain claims.

The latest court development focuses on a procedural dispute over document disclosure. Roger Derrington criticized Siemens for insufficient compliance with discovery obligations, ordering the company to produce relevant documents and emails. The court also directed Siemens to cover South32’s legal costs associated with the application.

The case highlights the growing legal and operational risks tied to industrial software systems, particularly in critical infrastructure environments where failures can lead to significant physical and financial damage.