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Louisiana Energy Gateway & Haynesville Production

 

 


The Louisiana Energy Gateway (LEG) pipeline is built and operated by Williams Companies, the Tulsa‑based midstream and pipeline company. LEG is a gas gathering pipeline system with a design capacity of 1.8 Bcf/d. The system will move natural gas in Haynesville southward towards the Gulf Coast LNG terminals and other markets. 

LEG began flowing gas around July 23, 2025. The Transcontinental Pipeline, also operated by Williams, began showing flows on July 23, 2025, and is now flowing almost 0.3 Bcf/d on its interconnect with LEG. LEG interconnect flows of up to 0.1 Bcf/d also began on Cameron Interstate Pipeline beginning on July 30, 2025. The Gillis Hub Pipeline interconnect with LEG began flowing on July 31, 2025, with flows of up to 0.08 Bcf/d. Lastly, the Louisiana Intrastate Pipeline interconnect with LEG began flowing on July 31, 2025, with flows of up to 0.1 to 0.2 Bcf/d. Total LEG interconnect flows are slightly over 0.6 Bcf/d as of early August 2025. 



During the same time that LEG has come online, Hyperion’s modeled pipeline scrape production data (using interstate production data points) for Haynesville Louisiana has increased by approximately 0.4 bcf/d from July 23 to August 4th.  However, as you can see from the graph below, that is well within the day-to-day variation of the pipe scrape production model, so this gives little confidence that any of the LEG flows are incremental production. (The scale variation on both sides is the same, to place the increased flows in context.)  

Our strongest indication that this production is not incremental is from Hyperion’s short-term production forecast, which models production from existing and future well completions and shows production remaining steady. Because the short-term production forecast is based on total well completions, one would’ve expected to see a rise in the forecast for Haynesville Louisiana if there was additional production being added in anticipation of LEG starting. However, this doesn't seem to be the case. 

When Matterhorn came online in October 2024, there was some confirmation of incremental natural gas production from the short-term production forecast in West Texas, as the STF started increasing about a month before, while the pipeline data didn’t show consistent increase until Matterhorn came on, indicating there was production waiting to be turned on. There hasn’t been the same confirmation in Haynesville Louisiana.  

Therefore, we believe that there is little, if any, immediate production impact from the LEG gathering system coming online.

 Summary

Primarily because we have not seen any completion increases from the Hyperion short-term production forecast for Haynesville Louisiana, we do not believe that it is necessary to adjust upward the Hyperion pipeline scrape data by using the LEG interconnect data at this time. The LEG system will continue to be monitored for new interstate interconnect points and we will of course continue to monitor this region for changes. In addition, as Louisiana production data becomes available for this region in a few months, we conduct our customary recalibration process and reexamine our numbers.