Japan Launches Asia’s First Osmotic Power Plant
On August 5, 2025, Japan officially launched its first osmotic power plant in Asia, located at the Uminonakamichi Nata Seawater Desalination Center in Fukuoka Prefecture. This facility is the second of its kind globally, following the first osmotic power plant in Mariager, Denmark.
Osmotic Power Technology:
Osmotic power, also known as salinity gradient power, generates electricity by exploiting the difference in salt concentration between freshwater and seawater. When separated by a semi-permeable membrane, freshwater moves into seawater to balance the concentration, creating pressure that drives turbines to produce electricity.
Technical Specifications:
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Estimated annual generation: 880,000 kWh
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Sufficient to power: Approximately 220 households or support a desalination plant
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Investment cost: Approximately ¥700 million
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Operator: Fukuoka District Waterworks Agency
Significance:
This plant not only provides a stable and continuous power source but also helps reduce CO₂ emissions, supports desalination operations, and contributes to Japan’s renewable energy strategy.
