Opening Ceremony Held for Makigawa Small Hydropower Plant
The opening ceremony for the Makigawa Small Hydropower Plant was held in Otsuki City, Yamanashi Prefecture. Operated by TK Aqua Green Co., Ltd., a joint venture including Tetsuken Kensetsu, the plant contributes to regional development and decarbonization.
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- 📰 Published: April 28, 2026 at 21:59
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Makigawa Small Hydropower Plant "Opening Ceremony" Held
On April 23, the "Opening Ceremony" for the Makigawa Small Hydropower Plant was held in Otsuki-cho, Otsuki City, Yamanashi Prefecture.
From left: Mr. Imai, President of Tetsuken Kensetsu Co., Ltd., Mr. Kobayashi, Mayor of Otsuki City, Mr. Osada, Deputy Director of Yamanashi Prefectural Forest and Environment Department, H.E. Sigrid Berka, Ambassador Extraordinary and Plenipotentiary of the Austrian Embassy, and Mr. Miyazaki, President of TK Aqua Green Co., Ltd.
This power plant was constructed after our company was selected by Yamanashi Prefecture in August 2022 as a "Small Hydropower Promotion Operator within Yamanashi Prefectural Forests." Subsequently, in April 2023, agreements were concluded with Yamanashi Prefecture regarding "Implementation of Small Hydropower Business in Prefectural Forests" and with Otsuki City regarding "Regional Cooperation Agreement for the Utilization of the Makigawa Power Plant." After consultations with relevant parties were finalized, TK Aqua Green Co., Ltd. (*) was established to proceed with operations. On April 1, 2026, the Makigawa Small Hydropower Plant began operating in Otsuki City, Yamanashi Prefecture.
The opening ceremony was grandly held with many stakeholders in attendance, including representatives from the Yamanashi Prefectural Forest and Environment Department, Yamanashi Prefectural Assembly members, the Mayor of Otsuki City, and the Katsuragawa Fishery Cooperative. As the plant's turbine is Austrian-made, the Austrian Ambassador also graced the event with her presence.
President Imai of our company delivered a greeting, stating, "Under the regional cooperation agreement, in response to requests from the city, we have established a support system to provide portable power sources and stockpiled goods during disasters, contributing to the enhancement of the region's disaster prevention capabilities. We will strive to operate reliably for the people of the region as a group, taking today's operational start as a new beginning."
■ Makigawa Small Hydropower Plant
Water intake facility power plant exterior
Hydro turbine generator
Maximum water usage
0.30㎥/s
Gross head
78m
Maximum output
199kW
Turbine type
Vertical Pelton (4-jet)
First Small Hydropower Facility as a Yamanashi Prefecture Public Solicitation Project
The Makigawa Small Hydropower Plant utilizes the Feed-in Tariff (FIT) system and the land and erosion control dams within prefectural forests. It is the first small hydropower facility selected through a public solicitation process by the prefecture, conditioned on contributing to the region through power generation business.
Contribution to a Decarbonized Society
Hydropower is a power source with particularly low CO₂ emissions among renewable energies. This power plant is expected to supply electricity equivalent to approximately 280 general households. If this electricity replaces existing power usage, an annual CO₂ emission reduction effect of approximately 523 tons is expected.
Conservation of River Environment and Biodiversity
This power plant is a run-of-river type, where power generation varies with river flow. Therefore, power generation is lower during periods of low flow. For water intake, efforts are made to secure the necessary flow to maintain the river environment and to remove as few organic materials as possible, such as fallen leaves, that support the river ecosystem. Furthermore, facility development within protected forests is carried out in a manner compliant with strict regulations regarding building installation and land modification.
Cooperation and Collaboration with the Region
This power plant was developed with the support of Yamanashi Prefecture for the purpose of promoting carbon neutrality and effective utilization of prefectural assets, and a portion of its business revenue will be paid to the prefecture. Furthermore, to promote environmental education and establish a cooperation system during emergencies, a regional cooperation agreement has been concluded with Otsuki City. This agreement stipulates regional cooperation actions such as: ① storing emergency supplies within the power plant that can be used during disasters, ② prioritized provision of emergency power (power charged to portable power sources, etc.) during disasters, and ③ offering the power plant as a place for environmental learning, thereby building a cooperative system with the city.
Our company will continue to strive for contribution to the local community and contribute to the realization of a sustainable society through the promotion of sustainability.
* TK Aqua Green Co., Ltd. is a company established for this project, with capital contributions from four parties: Tetsuken Kensetsu Co., Ltd., Iizuka Kogyo Co., Ltd., Okayama Densetsu Co., Ltd., and Renewable Energy Regional Design Research Institute Co., Ltd.
On April 23, the "Opening Ceremony" for the Makigawa Small Hydropower Plant was held in Otsuki-cho, Otsuki City, Yamanashi Prefecture.
From left: Mr. Imai, President of Tetsuken Kensetsu Co., Ltd., Mr. Kobayashi, Mayor of Otsuki City, Mr. Osada, Deputy Director of Yamanashi Prefectural Forest and Environment Department, H.E. Sigrid Berka, Ambassador Extraordinary and Plenipotentiary of the Austrian Embassy, and Mr. Miyazaki, President of TK Aqua Green Co., Ltd.
This power plant was constructed after our company was selected by Yamanashi Prefecture in August 2022 as a "Small Hydropower Promotion Operator within Yamanashi Prefectural Forests." Subsequently, in April 2023, agreements were concluded with Yamanashi Prefecture regarding "Implementation of Small Hydropower Business in Prefectural Forests" and with Otsuki City regarding "Regional Cooperation Agreement for the Utilization of the Makigawa Power Plant." After consultations with relevant parties were finalized, TK Aqua Green Co., Ltd. (*) was established to proceed with operations. On April 1, 2026, the Makigawa Small Hydropower Plant began operating in Otsuki City, Yamanashi Prefecture.
The opening ceremony was grandly held with many stakeholders in attendance, including representatives from the Yamanashi Prefectural Forest and Environment Department, Yamanashi Prefectural Assembly members, the Mayor of Otsuki City, and the Katsuragawa Fishery Cooperative. As the plant's turbine is Austrian-made, the Austrian Ambassador also graced the event with her presence.
President Imai of our company delivered a greeting, stating, "Under the regional cooperation agreement, in response to requests from the city, we have established a support system to provide portable power sources and stockpiled goods during disasters, contributing to the enhancement of the region's disaster prevention capabilities. We will strive to operate reliably for the people of the region as a group, taking today's operational start as a new beginning."
■ Makigawa Small Hydropower Plant
Water intake facility power plant exterior
Hydro turbine generator
Maximum water usage
0.30㎥/s
Gross head
78m
Maximum output
199kW
Turbine type
Vertical Pelton (4-jet)
First Small Hydropower Facility as a Yamanashi Prefecture Public Solicitation Project
The Makigawa Small Hydropower Plant utilizes the Feed-in Tariff (FIT) system and the land and erosion control dams within prefectural forests. It is the first small hydropower facility selected through a public solicitation process by the prefecture, conditioned on contributing to the region through power generation business.
Contribution to a Decarbonized Society
Hydropower is a power source with particularly low CO₂ emissions among renewable energies. This power plant is expected to supply electricity equivalent to approximately 280 general households. If this electricity replaces existing power usage, an annual CO₂ emission reduction effect of approximately 523 tons is expected.
Conservation of River Environment and Biodiversity
This power plant is a run-of-river type, where power generation varies with river flow. Therefore, power generation is lower during periods of low flow. For water intake, efforts are made to secure the necessary flow to maintain the river environment and to remove as few organic materials as possible, such as fallen leaves, that support the river ecosystem. Furthermore, facility development within protected forests is carried out in a manner compliant with strict regulations regarding building installation and land modification.
Cooperation and Collaboration with the Region
This power plant was developed with the support of Yamanashi Prefecture for the purpose of promoting carbon neutrality and effective utilization of prefectural assets, and a portion of its business revenue will be paid to the prefecture. Furthermore, to promote environmental education and establish a cooperation system during emergencies, a regional cooperation agreement has been concluded with Otsuki City. This agreement stipulates regional cooperation actions such as: ① storing emergency supplies within the power plant that can be used during disasters, ② prioritized provision of emergency power (power charged to portable power sources, etc.) during disasters, and ③ offering the power plant as a place for environmental learning, thereby building a cooperative system with the city.
Our company will continue to strive for contribution to the local community and contribute to the realization of a sustainable society through the promotion of sustainability.
* TK Aqua Green Co., Ltd. is a company established for this project, with capital contributions from four parties: Tetsuken Kensetsu Co., Ltd., Iizuka Kogyo Co., Ltd., Okayama Densetsu Co., Ltd., and Renewable Energy Regional Design Research Institute Co., Ltd.