Japan Solar Update: No.166 (Sept 15 ~ 19, 2025)
ITOCHU Corporation has announced that it will collaborate with KYUDENKO on a Feed-in Premium (FIP) conversion project of PV power plants in the form of additionally installing largescale storage batteries at these PV power plants.
Changing Business Environment
Revision of priority dispatch rules:
- FIT plants curtailed before FIP plants
- Support schemes established for battery co-location
- Procurement shortages in the balancing market remain a challenge, increasing the importance of battery-based adjustment functions
Business Model
Under this partnership, ITOCHU will procure storage batteries, inverters, energy management systems (EMS), and other equipment required to establish the storage systems. The company will also manage operation and maintenance.
KYUDENKO, on the other hand, will be responsible for engineering, procurement, and construction (EPC).
First Initiative
As the first phase, ITOCHU and KYUDENKO have signed an EPC contract to install a storage battery system with an output capacity of 12 MW and a storage capacity of 49.356 MWh at the Saga Ouchi PV Power Plant, a joint investment project.
Saga Ouchi Solar Power Plant, operated by Saga Ouchi Solar Co. (jointly funded by ITOCHU and Kyudenko), decided to convert to FIP. EPC contract with Kyudenko for co-located battery storage.
Sega Ouchi Solar Power Plant
Output: 16.5 MW
Operation Start: Aug 2018
Certification: Mar 2014
Battery System Rated output: 12MW Capacity: 49.3567MWh
This upgrade will allow the plant to participate in the FIP program, marking an important step in integrating storage solutions into Japan’s solar energy infrastructure.