Top LNG traders Shell and BP have separately filed for arbitration against U.S. exporter Venture Global LNG for failing to supply contracted cargoes, even as it sold to non-contract customers as prices soared, four people familiar with the matter said.

A Venture Global LNG spokesperson did not comment on the Shell and BP claims. Last month, the company said it was in full compliance with terms of its long-term contracts and cited a need for extensive commissioning of its modular facility.

Shell and BP missed out on billions of dollars in sales that went to Venture Global LNG because they were unable to get their contracted fuel, one of the people familiar with the arbitration filings said. Prices for LNG soared last year on Russia's gas-supply cuts to Europe.

The companies filed their cases at the London Court of International Arbitration. A similar case was brought by Italian utility Edison SpA in May. Another Venture Global LNG contract customer, Spanish energy firm Repsol SA, asked U.S. regulators to release confidential records that would shed light on the plant's startup.

Shell and BP declined to comment.

Founded by a former energy lawyer and investment banker, Venture Global LNG has emerged as a market force with its ability to obtain financing and rapidly build export plants. It has pledged to produce 70 million tons per year (mtpy) of LNG once the projects are completed.

The contracts were tied to Calcasieu Pass LNG, the first of Venture Global LNG's three planned facilities. It stitched together 18 liquefaction units to produce up to 12 mtpy of the supercooled gas.

However, the plant's on-site power supply facility required extensive repairs that will prevent contract deliveries from the first phase until early 2024, Venture Global LNG has said.

Still, the facility has shipped six pre-commercial LNG cargoes so far this month, and 166 since its exports began in March 2022, Refinitiv vessel tracking data showed.

"The whole point in signing a contract is there is certainty you're going to have this supply and, in this case, that certainly has not emerged," said Ira Joseph, an LNG expert and fellow at Columbia University's Center on Global Energy Policy.

The dispute will cause buyers to strictly define commissioning in future purchase and sales agreements, he said.

The contracted customers believe they lost enormous profits as LNG prices in Europe jumped last August to a peak of $89 per million British thermal units (MMBtu), from about $6/MMBtu to $10/MMBtu in 2018. Prices earlier this month were about $11/MMBtu.