A coalition of local advocacy groups and the Sierra Club filed a lawsuit in Louisiana’s 38th Judicial District on Friday, challenging a coastal use permit issued for the Marais Pipeline. The legal action targets the Louisiana Department of Conservation and Energy, arguing the permit was granted without a legally required impacts analysis. The pipeline would feed natural gas to the proposed CP2 LNG export terminal, one of the largest such facilities in the U.S.
The plaintiffs — Louisiana Bucket Brigade, Fisherman Involved in Sustaining our Heritage (FISH), and Sierra Club — contend the state agency failed to assess environmental and community consequences before approving the permit. Their suit seeks to halt construction pending a full review. The pipeline route crosses sensitive coastal wetlands, which the groups say could harm fisheries and local ecosystems.
CP2 LNG, if built, would be a major addition to U.S. liquefaction capacity, targeting exports to European and Asian markets. The terminal has drawn opposition from climate activists who argue it locks in decades of fossil fuel production, while supporters cite energy security benefits. The Marais Pipeline is a critical link in the project's supply chain, making the legal challenge a potential bottleneck.
Louisiana regulators have defended the permit process, noting compliance with state coastal management laws. The lawsuit is the latest in a series of legal battles over Gulf Coast LNG development, reflecting broader tensions between energy exports and environmental protection. A ruling is not expected for several months, but the case could delay pipeline construction timelines.
While the litigation targets a single permit, opponents frame it as a test case for the entire CP2 project. If successful, the challenge could force a systematic reevaluation of coastal permitting for energy infrastructure in the region. The outcome carries implications for U.S. LNG competitiveness amid shifting global gas demand.