The backers of a liquefied natural gas (LNG) export project in Alaska filed on Feb. 11 at the Federal Energy Regulatory Commission resource reports that are part of the commission’s review process.
The Alaska Gasline Development Corp., BP Alaska LNG LLC, ConocoPhillips Alaska LNG Co., ExxonMobil Alaska LNG LLC, and TransCanada Alaska Midstream LP plan to construct one integrated LNG Project (Project) with interdependent facilities for the purpose of liquefying supplies of natural gas from Alaska, in particular the Point Thomson Unit (PTU) and Prudhoe Bay Unit (PBU) production fields on the Alaska North Slope, for export in foreign commerce and opportunity for in-state deliveries of natural gas.
The LNG terminal part of the project includes:
- a liquefaction facility (Liquefaction Facility) in Southcentral Alaska;
- an approximately 800-mile, large diameter gas pipeline (Mainline);
- a gas treatment plant (GTP) on the North Slope;
- a gas transmission line connecting the GTP to the PTU gas production facility (PTU Gas Transmission Line or PTTL); and
- a gas transmission line connecting the GTP to the PBU gas production facility (PBU Gas Transmission Line or PBTL).
The new Liquefaction Facility will be constructed on the eastern shore of Cook Inlet in the Nikiski area of the Kenai Peninsula. It will include three liquefaction trains combining to process up to approximately 20 million metric tons per annum (MMTPA) of LNG. Three 160,000 cubic meter (m3) tanks will be constructed to store the LNG. The Liquefaction Facility will be capable of accommodating two LNG carriers. The size range of LNG carriers that the Liquefaction Facility will accommodate will be determined through further engineering study and consultation with the United States Coast Guard (USCG) as part of the Waterway Suitability Assessment (WSA) process.
In addition to the Liquefaction Facility, the LNG Terminal will include the following facilities:
- Mainline – A new large-diameter natural gas pipeline approximately 800 miles in length will extend from the Liquefaction Facility to the GTP on the North Slope. The diameter of the pipeline has not been finalized but for the purpose of these Resource Reports a 42-inch diameter pipeline is assumed. Along the Mainline route, there will be at least five off-take interconnection points to allow for the opportunity for future in-state deliveries of natural gas. The size and location of such interconnection points are unknown at this time.
- GTP – A new GTP and associated facilities in the Prudhoe Bay area will receive natural gas from the PBU Gas Transmission Line and the PTU Gas Transmission Line. The GTP will treat/process the natural gas for delivery into the Mainline. The Project also includes a new pipeline that will deliver natural gas processing byproducts from the GTP to the PBU.
- PBU Gas Transmission Line – A new natural gas transmission line will extend approximately one mile from the inlet flange of the GTP to the outlet flange of the PBU gas production facility.
- PTU Gas Transmission Line – A new natural gas transmission line will extend approximately 60 miles from the inlet flange of the GTP to the outlet flange of the PTU gas production facility.
- Ancillary Facilities – Existing State of Alaska transportation infrastructure will be used during the construction of these new facilities including ports, airports, roads, and airstrips. The potential need for new infrastructure and modifications or additions to these existing in-state facilities is under evaluation.