Kazakhstan Moves Kashagan Sulfur Case to International Tribunal

Kazakhstan has lodged an investment arbitration claim over sulfur storage rules at the Kashagan oil field, the vice minister of justice said Tuesday, sending the dispute to the International Centre for Settlement of Investment Disputes in Washington. The case targets the North Caspian Operating Company, the consortium that runs Kashagan and includes Shell, TotalEnergies, Eni, ExxonMobil, CNPC, Inpex and state-owned KazMunayGas.

Astana’s action follows a March 2023 inspection by environmental regulators that found the consortium storing sulfur in amounts above legally allowed thresholds. Authorities put the value of that environmental claim at roughly $5 billion and say a local trial court sided with the regulators. In response, six of the seven foreign partners — all but KazMunayGas — appealed the domestic ruling and separately launched international arbitration this year under bilateral investment treaties with France and the Netherlands, the vice minister said.

The justice ministry is coordinating the case with the ministries of ecology and energy. Officials also flagged a parallel dispute tied to project expenditures, which they say exceed $100 billion and are being pursued under the terms of the original production-sharing agreement. Government lawyers contend that under current arrangements the foreign operators keep as much as 49/50 of Kashagan’s oil revenues, leaving the state largely dependent on modest royalty payments; state claims linked to that issue have been put at about $160 billion.

Analysts in Astana say the proceedings are part of a broader push by authorities to renegotiate legacy oil deals struck in the 1990s as production steadies and budget pressures mount. “This is about shifting the balance toward the public purse,” said a local energy economist who reviewed the filings. “If the state prevails, it could change how foreign capital is treated on major fields and raise revenue for infrastructure and social spending.”

The government pointed to a recent arbitration outcome at another western Kazakhstan project as a sign of momentum. In January 2026 an international panel ruled largely for Kazakhstan in a dispute over the Karachaganak project involving Eni, Shell, Chevron and Lukoil; calculations of compensation for improperly reimbursed costs remain open, with outside estimates ranging from $2 billion to $4 billion. The vice minister also noted that legal expenditures for investor disputes have fallen to roughly one-third of 2021 levels even as the state continues to hire prominent international law firms.

Legal experts say the Kashagan arbitration could take years, with interim measures, evidence gathering and potential settlement talks along the way. For ordinary Kazakh taxpayers and fuel consumers, the stakes are concrete: higher state take from large fields could ease fiscal strain, but drawn-out litigation risks delaying any immediate boost in public revenues.