using all the land technically suitable for solar and wind could produce 14 times Japan’s annual electricity generation. The country has the space, but that isn’t translating into actual construction, he said.

Okay, both the headline and the article contents are wrong. There is, in fact, tons of space. The issue is not space, it’s cost and permits. “Japan Has No Appetite for Solar Farms Apart from Old Golf Courses” would be more accurate.