Japan’s power generation company JERA has announced that it has reached an agreement with Williams and GEP Haynesville II, LLC to acquire 100% of their interests in the South Mansfield upstream asset, located in the Haynesville Shale basin in western Louisiana (United States) (JERA press release, 23/10/2025).
JERA will acquire its stake in the Haynesville asset, which currently produces over 500 mcf/d (6 bcm/year) and includes 200 undeveloped locations, through an upfront investment of US$1.5bn. The transaction also includes a future investment plan aimed at increasing total production to 1 bcf/d (10.3 bcm/year). The agreement marks a new step in the growing presence of JERA in the US.
- In June 2025, JERA has signed 20-year agreements to buy up to 5.5 Mt/year of US LNG, nearly tripling its current imports of 3.5 Mt/year, with supplies from NextDecade, Commonwealth LNG, Sempra, and Cheniere (KEI, 13/06/2025).
- In September 2025, the company signed a Letter of Intent to possibly take supplies from Alaska LNG project (US) (JERA press release, 11/09/2025).
“The Haynesville Acquisition’s strategic value is supported by robust current production and proven reserves, established gathering, treating and transport infrastructure, and proximity to Gulf Coast LNG and data center hubs” according to JERA’s press release.
GEP Haynesville II is a joint venture between American companies GeoSouthern Energy and pipeline operator Williams Companies.