Mitsubishi Expands US Natural Gas Business With $7.5 Billion Aethon Acquisition

It’s Japan’s largest investment to date in the U.S. natural gas industry.

A lMitsubishi Electric Corp logo is pictured at a Combined Exhibition of Advanced Technologies event at the Makuhari Messe in Chiba, Japan, on Oct. 2, 2017. Toru Hanai/Reuters

Mitsubishi Corporation announced on Jan. 16 that it has expanded its presence in the United States’ shale gas industry with the acquisition of Aethon III LLC and Aethon United LP’s shale interests in Texas and Louisiana.

The $5.2 billion deal includes the assumption of $2.33 billion of Aethon debt and is expected to close between April and June, pending regulatory approvals.

The agreement, which provides Mitsubishi with natural gas operations across the entire supply chain, from upstream ownership to domestic sales and international exports, was struck between Mitsubishi and existing stakeholders such as Aethon Energy Management, Red Bird Capital Partners, and Ontario Teachers’ Pension Plan.

It’s Japan’s largest investment to date in the U.S. natural gas industry, which continues to flourish in the Gulf Coast region. According to the U.S. Geological Survey, as much as 35.8 trillion cubic feet of natural gas could be held underground from southeastern Texas to the Louisiana Delta, although much of those reserves are between 5,000 and 10,000 feet beneath the surface and would require extensive drilling and hydraulic fracking to extract.

Mitsubishi’s newly acquired assets are mostly located in the Haynesville Shale formation. Aethon had been producing about 15 million tons of liquid natural gas (LNG) annually. The acquisition provides Mitsubishi with increased upstream natural gas production capacity and easy access to the Cameron LNG terminal in Hackberry, Louisiana, a major global LNG export hub with direct access to the nearby deep-water Calcasieu Ship Channel. Mitsubishi already holds a liquefaction capacity contract at Cameron LNG.

While Aethon’s natural gas output is currently sold throughout the South, a portion of its production will be considered for export as LNG to Asia, Japan, and Europe, Mitsubishi said.

“This investment will not only strengthen the earnings base of MC’s natural gas and LNG businesses, but also accelerate efforts to build an integrated value chain in the United States—from upstream gas development to power generation, data center development, chemicals production, and related businesses,” Mitsubishi said in a statement.

Mitsubishi and Aethon said on Jan. 15 that they had formed an alliance to jointly explore additional energy opportunities and projects, including LNG, geothermal energy, and data center and digital infrastructure development.

“We view this alliance as a natural extension of Aethon’s disciplined, long-term approach to building integrated energy platforms,” said Albert Huddleston, Aethon’s founder and CEO.

Mitsubishi’s U.S. energy interests include an upstream partnership with Ovintiv in British Columbia, midstream logistics operations with CIMA Energy of Houston, and power generation through its wholly owned subsidiary Diamond Generating Corporation.

Mitsubishi’s shale play follows the U.S.–Japan Framework Agreement in late October 2025 between President Donald Trump and Japanese Prime Minister Sanae Takaichi. Japan committed $550 billion in investments in U.S. infrastructure, energy, critical minerals, electronics, and manufacturing projects.

Under the wide-ranging agreement, Japan’s largest importer of liquefied natural gas, JERA, acquired the shale gas interests of South Mansfield E&P in Louisiana for $1.5 billion in October.