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The proposed five-train expansion would add 7.75 Mtpa to the six-train Commonwealth LNG base project, bringing total planned capacity in Cameron Parish to approximately 17.25 Mtpa.
Published by Allstream Insiders
Allstream Insiders Summary
Caturus has announced a proposed 7.75-million-tonne-per-year expansion of its Commonwealth LNG export development in Cameron Parish, Louisiana. The five-train expansion would be added to the six-train, 9.5-Mtpa base project now under construction, increasing the site’s total planned liquefied natural gas capacity to approximately 17.25 Mtpa.
Caturus is targeting service for the expansion during the early 2030s, after operations begin at the base project. The expansion remains separate from the sanctioned base development: Caturus has not announced a final investment decision, financing package, regulatory docket, engineering, procurement and construction award or capital estimate for the additional five trains.
How Would the Commonwealth LNG Expansion Change the Project?
The expansion would add five liquefaction trains and approximately 7.75 Mtpa of capacity to the Commonwealth LNG site near Cameron. Combined with the six trains in the base project, the full development would comprise 11 trains with approximately 17.25 Mtpa of planned capacity.
| Development phase | Liquefaction trains | Planned capacity | Company-reported status |
|---|---|---|---|
| Commonwealth LNG base project | Six | 9.5 Mtpa | FID reached in May 2026; construction underway; operations targeted for 2030 |
| Commonwealth LNG expansion | Five | 7.75 Mtpa | Proposed; service targeted for the early 2030s |
| Combined planned development | 11 | Approximately 17.25 Mtpa | Includes the sanctioned base project and proposed expansion |
Caturus said the proposed expansion would provide an additional tranche of long-term LNG supply for global buyers. The company also said its growing upstream natural gas portfolio is intended to support the additional capacity.
Commonwealth LNG Base Project Is Under Construction
Caturus reached a positive final investment decision on the 9.5-Mtpa Commonwealth LNG base project on May 15, 2026. The company closed $9.75 billion in project financing and described the base development as an approximately $13 billion project.
Construction is progressing toward a company-targeted 2030 operating date. Caturus said approximately 8.5 Mtpa of the base project’s 9.5-Mtpa capacity is covered by long-term sale and purchase agreements.
Technip Energies is the EPC partner for the base project. Previously announced major equipment for those six trains includes:
- Six Baker Hughes mixed-refrigerant compressors powered by LM9000 gas turbines.
- Six Honeywell main cryogenic heat exchangers.
- Four Solar Turbines Titan 350 gas turbine-generators.
Those equipment selections and the Technip Energies EPC role apply to the base project. Caturus has not assigned those companies or equipment packages to the five-train expansion in the September 15 announcement.
What Could the Expansion Mean for the LNG Supply Chain?
Caturus said it expects to carry forward experience from the base project’s engineering, procurement and construction program. The company specifically referenced its modular construction methodology, established equipment and fabrication supply chain, and existing vendor and partner relationships.
Based solely on the announced configurationโnot on published bid packagesโthe proposed five-train expansion could eventually involve additional modular fabrication, liquefaction equipment, compression, power generation, piping, electrical systems, instrumentation, storage, marine and balance-of-plant work. Actual scopes will depend on the project’s engineering, permitting, commercial development and investment decisions.
Caturus also said the expansion could extend employment and supplier activity in Cameron Parish. The company did not identify construction totals, permanent-job estimates or specific procurement opportunities for the proposed expansion.
Regulatory Status Requires a Clear Phase Distinction
Federal Energy Regulatory Commission records describe the previously reviewed Commonwealth LNG project as a six-train terminal with associated storage, marine and pipeline facilities. The new five-train expansion would require its own applicable regulatory review and authorizations before construction and operation.
The September 15 announcement introduces the expansion’s capacity and target service period but does not report the filing of a federal application for the additional trains. The 17.25-Mtpa figure should therefore be understood as total planned capacity rather than fully sanctioned or operating capacity.
About Caturus
Caturus is a privately held integrated natural gas and LNG company backed by Kimmeridge, with strategic investments from Mubadala Energy and Canada Pension Plan Investment Board. The company’s platform includes upstream operations with more than 1 Bcfe/d of net production across more than 280,000 net acres in Texas and the Commonwealth LNG development in Cameron Parish, Louisiana.
