Kagoshima’s Two Solar Projects Boost Profits 1.5x with “FIP Transition + Battery Storage”
September 25, 2025, 10:30
Green Growth Co., Ltd. (Chiyoda-ku, Tokyo), a company engaged in renewable energy projects, announced on September 16 that it has launched a project to switch from the Feed-in Tariff (FIT) scheme to the Feed-in Premium (FIP) scheme and install battery storage systems for two large-scale solar power plants (mega-solar) in Kagoshima Prefecture, owned by Nankyu (Kanoya City, Kagoshima).
Overview of the Two Mega-Solar Plants
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MK Solar Ari Sato 2 (Kanoya City):
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Started operation in April 2023
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PV panel capacity: 1,898 kW
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Grid connection capacity: 1,750 kW
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MK Solar Daikonzome Tenbo (Kinko Town):
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Started operation in March 2022
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PV panel capacity: 1,812 kW
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Grid connection capacity: 1,750 kW
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Both plants will transition from FIT to FIP and install 6,880 kWh battery storage systems each. The batteries are scheduled to start operation in April 2026.
Operation and Revenue Target
Green Growth will act as the aggregator, responsible for charge/discharge control, market trading, and supply-demand management. They will use the control system provided by Shizen Connect (Chuo-ku, Tokyo) to:
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Charge batteries during the daytime when output curtailment risk is high and market prices are low.
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Discharge and sell electricity during high-price hours to maximize revenue.
The project aims to achieve 150% of the revenue compared with the pre-FIP period.
Context and Strategy
Nankyu is involved in agricultural product development, production, import, distribution, and renewable energy business. As of 2025, it owns:
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18 high-voltage connected solar power plants
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75 low-voltage connected solar power plants
→ With a combined capacity of around 30 MW under the “MK Solar” brand.
Given the increasing output curtailment and declining feed-in revenue, Nankyu decided to proceed with the FIP + battery strategy.
Previously, in July 2025, Green Growth also announced a similar FIP + battery project at a mega-solar plant in Hita City, Oita Prefecture, owned by Kagashiya (Ukiha City, Fukuoka). Green Growth aims to complete 25 such projects for high-voltage solar plants by the end of FY2025, totaling over 30 MW.
