Hitachi declined to reveal the PV module supplier for the project, which will be built on a site spanning 820,000 square metres in the village of Showa, Gunma prefecture.

The ¥13bn ($128m) installation is expected to be one of the biggest in the greater Tokyo area once it is completed in April 2017.

In addition to the Gunma project, Tokyo-based Ichigo has a 30MW pipeline in Japan, including an 8.53MW