Japan’s corporate push into geothermal energy just picked up more momentum.

Kyuden Mirai Energy has signed a new offsite geothermal power purchase agreement that will send clean electricity from its geothermal plants to office buildings in Tokyo owned by Japan Prime Realty Investment Corporation. The deal is structured with Nippon Steel Engineering acting as the retail power provider connecting generation to end users.

Under the agreement, about 900 megawatt-hours of geothermal electricity will be delivered each year from Kyuden Mirai’s power plants to JPR’s urban office properties. Instead of producing power on-site, the buildings will draw renewable energy from geothermal facilities located elsewhere — a model that’s becoming more common as companies look to decarbonize without major retrofits.

This isn’t Kyuden Mirai’s first corporate geothermal deal. The company has already signed similar offsite PPAs with Tokyo Tatemono and Panasonic, helping both firms cut emissions tied to buildings and manufacturing operations.

For JPR, the move fits directly into its long-term climate strategy. The real estate investment company has identified climate action as a core business issue, setting targets to cut total greenhouse gas emissions by 46.2 percent from 2019 levels by 2030 and reach net-zero emissions by 2050. Supplying office buildings with geothermal power offers a steady, low-carbon energy source that isn’t dependent on weather or daily solar output.

Kyuden Mirai already operates four geothermal power plants across Japan, including large-scale facilities like Hatchobaru, Takigami, Yamakawa, and Ogiri. Additional projects are moving forward as well, with a smaller plant under construction in Kirishima and early environmental review underway for another development in Yutsubo.

The bigger picture is clear: geothermal is quietly becoming a corporate decarbonization tool in Japan, not just a utility-scale power source. As offsite PPAs grow, real estate owners and manufacturers can lock in stable clean energy while supporting new geothermal development.

For an energy source that runs 24/7 and sits largely out of sight, geothermal is starting to play a very visible role in Japan’s clean power transition — one office building at a time.