SPI and Uniroot will establish a joint venture 51% and 49% interests, respectively, to develop the projects.
SPI chairman Xiaofeng Peng said: "Combining SPI’s leading expertise in developing world-class PV power plants with Uniroot’s deep local connections and experience in the Japanese solar market, we are confident that this a win-win partnership which will create significant value for both parties in the years ahead."
The company will manage project funding, construction and equipment, while K.K Uniroot will oversee land purchase and lease, permits and power purchase agreements, among others.
Further details of the project have not been disclosed.
By the end of this year, Japan is expected to install around 12.7GW of solar panels, reported Bloomberg.
