Citgo Greenlights $310 Million Lake Charles Processing Unit to Supercharge Refinery

Citgo Petroleum Corp. has approved a $310 million investment to install a new processing unit at its Lake Charles refinery in Louisiana.

The final investment decision moves a major refinery enhancement from planning into execution at the company’s largest processing complex.

The project, formally named the Lake Charles refinery depentanizer project, is designed to strengthen the facility’s ability to process domestic light crude.

It will also increase production of valuable components used in gasoline blending.

Citgo had announced in mid August that funding for the project would be deferred.

The company reversed that pause with its Sept. 1 approval, signaling renewed confidence in the investment and the strategic importance of the Lake Charles site.

The refinery is positioned along the Calcasieu Ship Channel and has a current nameplate capacity of 479,000 b/d.

Its deep conversion configuration gives Citgo substantial flexibility to process crude and manufacture transportation fuels for the United States market.

New installations and equipment planned under the project will improve the refinery’s naphtha upgrading capabilities.

Citgo expects the unit to convert lower value process streams into higher quality and higher value gasoline blend components.

That conversion should allow the refinery to capture more value from each barrel while adapting its product slate to market requirements.

The project also provides another route for improving gasoline component output without constructing an entirely new refinery.

Citgo said the investment is part of its strategy to preserve the long term viability and competitiveness of the Lake Charles operation.

The company also linked the project to regional economic stability and the continuing need for dependable domestic fuel supplies.

Processing flexibility is becoming increasingly important for large Gulf Coast refineries as crude quality, feedstock economics, and product demand continue to shift.

A unit that expands naphtha upgrading options can help refinery operators optimize runs and respond more effectively to changing gasoline markets.

The project is also expected to reinforce the future of the existing workforce based in Southwest Louisiana. Citgo said construction will create additional opportunities for contract personnel, local suppliers, and regional service providers.

Those benefits could extend across engineering, fabrication, equipment installation, inspection, and commissioning activities.

Large refinery projects typically require a broad network of specialized industrial companies, particularly during peak construction periods.

With the final investment decision secured, Citgo will advance engineering, construction, and commissioning work toward a targeted startup in 2029.

The schedule gives the operator several years to complete detailed design, procure major equipment, execute field construction, and prepare the unit for commercial service.

Citgo did not explain why it decided to restore funding so soon after announcing the deferral. The company also did not say whether the $310 million commitment would alter its latest 2026 capital expenditure outlook.

That August outlook called for total 2026 capital spending of $867 million and specifically excluded the Lake Charles depentanizer project. Investors and suppliers will now be watching for clarification on whether project expenditures will be added to that figure or distributed across later budget periods.

The Lake Charles complex was originally commissioned in 1944 and has undergone repeated modernization.

Upgrades completed in 2023 increased nameplate capacity from 425,000 b/d to 463,000 b/d, making the site Citgo’s largest refinery.

Later improvements raised crude processing capacity by another 16,000 b/d to the current 479,000 b/d level. Citgo attributed that gain to crude unit naphtha handling debottlenecking, process control upgrades, and other infrastructure improvements detailed in its 2025 annual report.

The newly approved unit builds on that continuing program of targeted refinery investment. Rather than relying only on additional crude throughput, Citgo is directing capital toward improved conversion, stronger margins, greater operating flexibility, and increased production of marketable gasoline components.

For Lake Charles, the decision provides a substantial industrial commitment extending toward the end of the decade.

For Citgo, it advances a project intended to keep a crucial Gulf Coast refinery competitive while supporting reliable transportation fuel production for the domestic market.