The company has told its partners it is considering building TSMC Fab-23 Phase 3, in Kumamoto Prefecture. The company is building one fab in Japan for less advanced chips, and plans for a second facility have been reported earlier.

The 3nm process is the most cutting-edge chipmaking technology commercially available right now, though by the time TSMC’s potential fab is up and running, the technology would likely to be one to two generations behind that.

Prime Minister Fumio Kishida’s administration has been providing trillions of yen in subsidies to lure investments from domestic and foreign semiconductor companies.

A 3nm fab is likely to cost about $20 billion, including the machines for production. However, precise expenses would depend on when the facility is built and how it acquires land and other materials. It’s unclear how much TSMC anticipates spending on the third fab. Japan typically covers about half of the costs of such facilities.

In addition to Japan, TSMC has also pledged to build two plants in the U.S. and one in Germany as its customers want more diversified supplies in the face of growing uncertainties in the Taiwan Strait. Although, according to the movies Japan does have a problem with Godzilla and other giant monsters.