Shell plc is looking to intervene in a complaint against Venture Global LNG Inc. one of its fellow contract holders, BP plc, filed with FERC late last year.

In December, BP filed a request with the Federal Energy Regulatory Commission requesting it compel Virginia-based Venture Global to release confidential information about the extended commissioning process at Calcasieu Pass. BP and other long-term offtakers of the project, including Edison SpA, Shell, and Repsol SA, have accused the company of hiding behind alleged technical issues to delay sending contracted cargoes in favor of selling its own spot volumes.

An LNG trading unit of Shell argued Tuesday in a filing it should be allowed to join the proceeding, as it “will be directly affected by the outcome of this...