Actually japan is leading in terms of investment plans and also the country is growing much rapidly in terms of business, import/export, etc. The country will surely make this project stand on itself and also investors from several countries will too make some investments into this project.
Did you know Japan has over 80% of the state budget overseas. No wonder even damage from nuclear power plants didn't affect their economy too much.
I'm sure they've some business partners worldwide to promote this project.