Sev.en Global Investments sues CS Energy over Callide power station failures

A joint venture partner in Queensland's Callide power station has launched a Federal Court lawsuit against the state-owned operator, CS Energy, seeking more than $1 billion. Czech-based Sev.en Global Investments says repeated failures at the plant have caused major losses in generation capacity over the past five years. The legal action was filed on Friday in Australia and centres on three separate incidents at the power station.

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Sev.en Global Investments said the failures led to the loss of more than 1,700 days of generation capacity. It said it is seeking to recover losses linked to those outages and the cost of repairs. CS Energy said in a statement that it would defend itself against the allegations.

The dispute involves the operator of Queensland's largest power plant and a foreign investment group that owns half of the site through its subsidiary IG Power. The lawsuit follows a series of serious incidents at Callide that have already had major operational and financial consequences. In 2021, an explosion at the C4 unit was caused by a failed battery back-up system and left almost 500,000 Queensland customers without power.

That outage was described as the state's worst in decades. C4 remained offline for more than three years, and Sev.en says repairs to the unit cost about $250 million. The case also refers to a cooling tower collapse at unit C3 in October 2022, which Sev.en says led to costs of more than $330 million for repair, demolition and rebuilding.

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A further boiler explosion at C3 in April 2025 triggered another investigation and left the unit offline for 58 days. According to the supplied material, that investigation produced a report criticising risk controls, operator training and aspects of the unit's design. Together, the incidents have turned Callide into a significant example of how repeated plant failures can affect supply, costs and investor relations.

The dispute matters because Callide is not only a major electricity asset but also a joint venture between a state-owned operator and a private foreign investor. The claim, which exceeds $1 billion, raises questions about responsibility for outages, maintenance and safety management at a large power station. It also comes at a time when reliability and investment in generation capacity remain central issues for the electricity sector.

For Queensland, the case revives scrutiny of a site already associated with one of the state's most serious blackouts in recent years. What remains unclear from the available material is how CS Energy will respond in court and how the claim will be assessed. The filing does not by itself determine liability, and the outcome will depend on the evidence presented in the Federal Court.

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