They did not reveal the financial terms of the capital and business alliance.
Shizen Energy was operating 152 MW of solar capacity throughout the Japanese archipelago by the end of January.
It is now developing about 600 MW of PV capacity in the country, in addition to 60 MW of wind projects.
By the end of December, the group’s O&M unit was also servicing about 137 MW of solar capacity.
The Fukuoka-based renewables developer is best known for its solar EPC venture with Germany’s juwi, which completed work on a 20 MW array in December in Fukuyama, Kagoshima prefecture.