History of Hydroelectric Projects in Seiwa Village (Yamato Town), Kumamoto Prefecture - 2005-2020s
In the Kiyowa district of Yamato Town, Kumamoto Prefecture (formerly Kiyowa Village), the Kiyowa Hydroelectric Power Plant began operation in 2005 with the aim of utilizing local resources and promoting renewable energy. The power plant is a village-run facility utilizing an existing erosion control dam, with an output of 190 kW, an effective drop of 14.38 meters, and a water consumption of 2 cubic meters per second. The power generated is utilized by the local "Seiwa Bunraku Theater" and "Roadside Station" to support energy self-sufficiency for public facilities.
Initially, the power plant generated approximately 9 million yen per year through a power sales contract with Kyushu Electric Power Company, with the aim of revitalizing the local economy and tourism. However, operating the plant is not easy, as it requires the purchase of electricity during periods of low demand, such as at night and when the facility is closed. Initially, the company planned to install its own power lines to public facilities, but due to the high cost of construction, the plan was abandoned and the operation was changed to power-sale-only.
Current Status in the 2020s
In the 2020s, it will be difficult to maintain stable power generation due to the challenges of fluctuating water levels caused by climate change and aging facilities. The target for annual power generation is set at 800,000 kWh, but in some years the target is not achieved due to instability in water quantity. Aiming for sustainable development of the region, plans are underway to deepen cooperation with residents and businesses, and to utilize the facility for environmental education and eco-tourism.
In the future, further utilization of local resources and cooperation with Kyushu Electric Power Company should be strengthened in order to build a sustainable society.
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