Developing carbon storage solutions for South Alabama

The Longleaf Carbon Capture and Storage (CCS) Hub is advancing plans for underground carbon dioxide (CO₂) storage near Bucks, Alabama. Led by the Southern States Energy Board, the project combines geologic research, engineering, permitting, and community engagement to support a potential storage hub serving regional industries.

Evaluating Storage & Infrastructure

The project will assess multiple underground formations for CO₂ storage and advance the planning needed to connect industrial sources with a storage site. Work includes site characterization, permitting, environmental review, pipeline engineering, and evaluation of potential CO₂ supplies.

Longleaf builds on experience from the Southeast Regional Carbon Sequestration Partnership’s CO₂ injection demonstration at nearby Citronelle, Alabama.

Current Status

Longleaf advanced permitting, site development, and engineering activities in 2026. Tenaska, in coordination with Advanced Resources International, submitted a new Class VI underground injection control permit application to U.S. EPA Region 4, which deemed it administratively complete on June 22, allowing the review process to advance. Tenaska secured rights to approximately 66 percent of the land needed for the hub’s long-term buildout, while Williams advanced the Southern Pipeline front-end engineering and design (FEED) study to approximately 70 percent completion. Williams also initiated procurement for a feasibility study evaluating its Theodore, Alabama, natural gas processing facility as a potential CO₂ source. DOE approved a six-month no-cost extension in June to support continued permitting and engineering. Planning is progressing for a deep stratigraphic test well, and the team is expanding its evaluation to include CO₂-enhanced hydrocarbon recovery and geothermal resource appraisal.

Project Team

The Board leads the project alongside Advanced Resources International, Crescent Resource Innovation, ENTECH Strategies, the Geological Survey of Alabama, Tenaska Sequestration Services, the University of South Alabama, and Williams.

Tenaska and its partners are developing the Longleaf storage hub.