Japan Launches Massive CO2 Methanation Facility to Power 10,000 Households via Natural Gas Pipelines

Inpex and Osaka Gas launch a landmark methanation plant in Japan, converting captured CO2 into synthetic gas for 10,000 residential homes.

By: AXL Media

Published: Feb 28, 2026, 3:39 AM EST

Source: The information in this article was sourced from Interesting Engineering

A Milestone for Synthetic Fuel Integration

Japan has significantly advanced its renewable energy infrastructure with the launch of one of the world’s largest CO2 methanation test facilities. Developed through a partnership between Inpex Corporation and Osaka Gas, the plant is designed to generate synthetic methane, or e-methane, at a scale sufficient to meet the annual heating and cooking needs of approximately 10,000 homes. This development represents a critical shift from theoretical research to practical application, as the facility has already demonstrated the ability to feed its output directly into existing natural gas distribution networks.

Strategic Partnerships and Government Backing

The project, which broke ground in 2021 following financial support from the New Energy and Industrial Development Organization (NEDO), reflects a coordinated effort between the Japanese government and private industry. While Inpex manages the site operations and overall project milestones at the Nagaoka Field Office, Osaka Gas provides the technical foundation through its proprietary catalytic methanation technology. This collaborative framework allowed the facility to move from construction in 2023 to full trial operations by late 2025, culminating in the successful injection of gas into the Koshijihara Plant pipeline this February.

Technical Achievement in Carbon Hydrogenation

At the heart of the facility is a sophisticated chemical process that utilizes captured carbon dioxide from industrial operations as a primary feedstock. By processing 400 normal cubic meters of CO2 per hour through catalyst-powered hydrogenation reactors, the plant converts waste emissions into high-quality fuel. According to technical reports from the site, the team has already reached a target methane concentration of 96 percent. This high level of purity is essential for ensuring that synthetic methane can be swapped for traditional natural gas without requiring modifications to consumer appliances or industrial burners.