Queensland government-owned CS Energy is under intense pressure after Czech investor Sev.en Global Investments filed a Federal Court lawsuit claiming losses exceeding $1 billion at the Callide C coal power station.
The dispute centres on allegations that CS Energy’s management of the 840-megawatt plant led to more than 1700 days of lost electricity generation capacity over the past five years.
Sev.en, which owns 50 per cent of Callide C alongside CS Energy and has invested in Australian energy assets for years, says prolonged talks with its partner failed to produce a commercial resolution.
Legal proceedings now aim to recover what Sev.en describes as mounting losses tied directly to operational failures at the central Queensland facility.
Callide C’s troubles escalated after a series of catastrophic explosions and a partially collapsed cooling tower progressively knocked out parts of the station’s output.
A key flashpoint was the May 2021 explosion of the C4 turbine, which forced the evacuation of the site and abruptly removed around 10 % of Queensland’s generating capacity from the east coast grid.
The incident triggered one of the most serious reliability events in the state’s electricity system, lifting wholesale market stress and drawing regulatory scrutiny.
Sev.en’s claim argues that CS Energy’s management decisions and plant operation are at the heart of the extended outages and associated financial damage.
Behind the new $1 billion-plus action sits a long-running war between the joint venture partners, who hold equal 50 per cent stakes and have already been locked in a sprawling legal fight.
Earlier disputes have targeted both the technical causes of the explosions and the way the financial fallout is being allocated between the owners of the coal-fired asset.
Industry observers point to the sheer length of Callide C’s downtime - more than 1700 days of lost capacity - as unusually severe for a major baseload generator.
The scale of disruption feeds into compensation claims, contract penalties and lost trading opportunities across energy and capacity markets.
The Callide C case highlights the growing legal and financial risks attached to ageing coal-fired power stations as reliability pressures rise on Australia’s electricity grid.
Joint venture structures, once seen as a way to spread risk, now amplify conflict when catastrophic failures hit and repair timelines stretch.
Market participants say operational decisions at a single 840-megawatt plant can ripple through state-wide capacity, wholesale prices and investor confidence.
The central question is how responsibility for one of Queensland’s most damaging power station failures is ultimately shared between the two equal owners.
