NiX Group is working to strengthen the development of its energy business in Japan and Indonesia, contributing to the realization of a decarbonized society in both countries and striving to become a company that is indispensable for a sustainable society.
Tongar Hydro Power Plant is located in the Tongar River basin, approximately 200km from Padang City in West Pasaman, West Sumatra, and will sell the power it generates to PT. PLN, Indonesia's state-owned power company, for the next 25years. The annual electricity sales amount is 38.73GWh, which is equivalent to approximately 46,000 ordinary Indonesian households.
In November 2019, NiX Group acquired a 75% stake in project special purpose company (SPC) PT. Optima Tirta Energy (“OTE”) and assumed majority ownership, a highlu rare case of a Japanese company developing its own hydro power plant as the majority shareholder. A project finance agreement was signed with PT. Sarana Multi Infrastruktur (Persero), Indonesia's state-owned development bank; support was received from the Development Bank of Japan and other Japanese government-affiliated financial institutions and regional financial institutions. After a construction period of approximately three and a half years, commercial operation began in November 2023. Since its operation, Tongar Hydro Power Plant has continued to generate more electricity than expected and has been operating stably despite being an overseas project.
Currently, OTE employs local personnel as resident employees to operate and manage the power plant with a staff of 25.
Tongar Hydro Power Plant Specifications
Project Location | West Pasaman, West Sumatra, Indonesia |
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Business entity | SPC (PT. Optima Tirta Energy) |
Maximum Output | 6,200kW |
Annual power generation | 38.73GWh (For 46,000 Indonesian ordinary households) |
Commercial operation date | November 1, 2023 |
Electricity sales period | 25years (FIT: Feed-in-tariff) |
Off taker | PT. PLN (Indonesia's state-owned power company) |
Technical Consulting | NiX JAPAN Co., Ltd. PT. NiX Indonesia Consulting |
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Maximum flow rate | 16.0m3/s |
Effective head | 44.4m |
Penstock | Φ2.800mm × 1 |
Total length of Power Plant | 3.5km |
Total length of waterway | 3.2km |
Water turbine | Francis Horizontal × 2 units |
01
Weir/Intake
The weirs and intakes are planned to take in a volume of water sufficient to generate the planned power output.
The weir is 49m lenght and 4m high above the riverbed, with two 2m wide sediment discharges designed to remove accumulated sediment and stones.
The intake has four gates, each 1.5m wide and 6.5m high, which can be operated mechanically. Water is taken in through the intake and flows through a channel to the sedimentation basin.
02
Sandtrap
Sandtrap is designed to remove stones and rocks from the withdrawn water. The Sandtrap is 60m length, 4.5m high, and 14m wide; moreover, it is divided into two sections. Widening the channel reduces the water flow slowly, causing stones and rocks to settle at the bottom of the sandtrap. These sediments are washed into the river by the drainage channel at the edge of the sedimentation basin.
03
Waterway
A waterway connects the sandtrap to the head pond, enabling the transfer of the water volume required for generating electricity to the head pond. The total channel length is 3,275m , 9.12m wide, and 2.56m high.
04
Head Pond
The head pond is installed just before the penstock. This facility provides a stable design flow rate from the head pond to the penstock, resulting in stable power output. The head pond length is 40m, 12m wide, and 8.43m high.
05
Penstock
Penstock is steel pipes that convey a sufficient amount of water to the power plant for power generation and have a structure that can withstand internal water pressure. Penstock is installed on the ground surface and secured with anchor blocks. The penstock length is 99.28m and has an inner diameter of 2,800mm.
06
Powerhouse
The power house is located on the right bank of the Tongar River and constructed from concrete. Overall Length of the power plant is 32m and 17m wide, and there are two Francis horizontal turbines, generators, a control room, and more.
We have decided to promote the development of hydro power generation project in Indonesia as our own business, in order to make use of the experience we have gained in Japan in the field of small hydro power generation.
Indonesia meets the necessary conditions for hydro power project implementation, such as the local natural environment, climate, socio-economic conditions, construction environment, and financing framework. First, Indonesia has a functioning power purchase agreement (PPA) system, local financing for hydro power development projects, several construction companies that can be entrusted with hydro power construction, and terrain suitable for hydro power generation due to abundant rainfall and mountainous features. Furthermore, Southeast Asia, with its ongoing economic growth, has consistently faced electricity shortages, making it an ideal location for developing hydro power projects. This has all lead to our decision to carry out this project in Indonesia.
To promote the development of our own hydro power plant, we recruited several Indonesian engineers and established a local subsidiary, PT. NiX Indonesia Consulting (NIC), in April 2019. After a series of site surveys and negotiations, we invested in the project in November 2019 and began construction in March 2020. During the approximately three and a half years construction period, happened the various risks and challenges, including the global COVID-19 pandemic, a large-scale earthquake, heavy rain damage, and repeated disruptions during site acquisition and construction. However, we solved each problem one by one cooperating with the construction workers and NIC members and the plant began commercial operations in November 2023.
November 2019
Investment in the Tongar Hydro Power Project
Acquired approximately 75% (based on voting rights) of the shares of OTE, the project's operating entity.
March 2020
Commencement of construction (preparatory work)
Began with land preparation for the construction access road and prepared accommodations for the construction staff.
April 2020
Construction temporarily suspended due to the global COVID-19 pandemic
Construction was halted for about two months following guidance from local government. Daily checks were conducted to confirm no COVID-19 positive cases among construction staff, and health management of all personnel involved in construction was implemented.
September 2020
Main construction work commenced
Construction of structures such as the weir, intake, and waterway etc. began sequentially.
February 2022
An earthquake occurs near the Tongar Hydro Power Plant
A large-scale earthquake with a magnitude of 6.2 occurred near the power plant (approximately 12km from the power plant), temporarily suspending construction.
Fortunately, no injuries were reported among on-site personnel, and there was no damage to critical structures at the power plant.
March 2022
Inspection on the turbine to be installed
Inspection of the turbine was conducted at Global Hydro's Austrian plant, where it was designed.
August 2022
Marine transportation of turbine-related equipment from Austria to Indonesia
Despite the impact of the Russia-Ukraine situation, the turbine equipment was successfully delivered to Indonesia by marine transport.
August 2023
Construction completed
The construction of the Tongar Power Plant was completed after a construction period of approximately three and a half years.
Test runs were conducted for approximately 2month, and testing was completed without any problems.
October 2023
Signed a commercial operation agreement with PT. PLN
On October 27, a commercial operation agreement was signed with PT. PLN.
November 2023
Commencement of commercial operation
Commercial operation of the Tongar Hydro Power Plant began on November 1.
Japanese company lead the development of hydro power projects from a majority ownership position
Utilization of BIM/CIM
Received the Minister of Land, Infrastructure, Transport, and Tourism Award in the Small and Medium-Sized Enterprise Category at the JAPAN Construction International Awards
The Tongar Hydro Power Project was Featured in MOU in Preparation for the Asia Zero Emission Community (AZEC) Summit Meeting
Selected as a 2024 Outstanding Project by PT. Sarana Multi Infrastruktur Persero, Indonesia's state-owned development bank
Tongar Hydro Power Plant completion ceremony
Japanese company lead the development of hydro power projects from a majority ownership position
Tongar Hydro Power Project was initially developed solely by an Indonesian company since 2013, including securing various rights and signing a power purchase agreement with PLN. The project had stalled owing to technical and financial issues. However, these issues were resolved through technological optimization and financial support provided by NiX Group's Indonesian subsidiary NIC and NiX Japan. This represents a particularly rare case where a Japanese company, as the majority shareholder, successfully developed and operated its own hydro power plant.
Our local subsidiary, NIC, acted as the owner's engineering and conducted repeated optimization studies to enhance feasibility and profitability, thereby reducing project costs and mitigating risks. During the construction phase, several employees were stationed onsite as the owner's representatives to manage construction work, ensure quality assurance, and manage the construction timeline. By providing technical and managerial support, they played a crucial role in ensuring the successful completion of the project.
Furthermore, by having JV partner PT. Nusa Konstruksi Enjiniring, whose main business is civil engineering, carry out the civil engineering work as the owner's construction, we have created a scheme that can control delays in construction time, cost management, and deterioration in quality.
Also, many local residents are employed in the operation and maintenance of the power plant, and we will continue to foster economic growth in the local community by providing new employment opportunities.
Utilization of BIM/CIM
We are actively incorporating the Construction Digital Transformation (DX) in engineering, and is utilizing BIM/CIM technology for the 3D and 4D models created by NIC for design and construction management. By creating and visualizing a 3D model prior to construction, we were able to share our vision with the construction company, which facilitated interference checks within the structure, allowing us to identify areas with potential construction challenges. And by utilizing BIM360's automatic quantity calculation feature, considerable reductions in errors and rework were achieved along with a decreased workload for routine tasks. In addition, a 4D model was created by integrating project management data—such as time, equipment, and manpower—into the 3D model. This enabled the simulation of construction procedures in alignment with the schedule and facilitated the identification of difference related to structural interferences, delays, and allocated resources.
By clearly visualizing the feasibility and safety of the construction process and sharing unified information from design through construction management with the construction company, we have enhanced the efficiency of project management and improved construction quality.
In addition to daily progress reports, the overall schedule was monitored in real time by reviewing weekly drone shooting of the construction progress. By utilizing BIM360, construction management can now be conducted from remote locations, this enables management across four key locations: the construction site, the Jakarta office, remote work from home, and the Japan headquarters. This approach facilitates a flexible working style, free from the constraints of time and location.
*Check 4D model
Tongar Hydro Power Plant 4D model August 2022
Received the Minister of Land, Infrastructure, Transport, and Tourism Award in the Small and Medium-Sized Enterprise Category at the JAPAN Construction International Awards
We received the Minister of Land, Infrastructure, Transport and Tourism (MLIT) Award in the Small and Medium-Sized Enterprise Category of the 7th JAPAN Construction International Awards for our efforts in the Tongar Hydro Power Project.
This award is intended to further promote the spread of "high-quality infrastructure in Japan" by the MLIT, to raise the international profile and to support the further overseas expansion of Japanese companies. Also, it is expected to increase the interest of the younger generation in the future of the construction industry by informing Japanese people about construction projects that are highly acclaimed overseas and Japanese companies that are active in overseas markets in an easy-to-understand manner.
【Evaluation Points of the Project】
The MLIT has provided an evaluation on the following aspects.
1. By utilizing a project finance agreement with the Indonesia state-owned development bank and securing funding with the support of a Japanese government financial institution, the company established a Singapore-based holding company to serve as the central hub for its overseas operations, also considering business expansion into Southeast Asia, where Feed-in Tariff (FIT) systems are in place to promote the adoption of renewable energy.
2. In accordance with the development of hydro power project, the community road has been paved and is used jointly by the local residents.
3. When roads and public facilities were damaged by the earthquake, the company used its construction equipment and personnel resources to repair public roads free of charge, giving top priority to disaster recovery.
The Tongar Hydro Power Project was Featured in MOU in Preparation for the Asia Zero Emission Community (AZEC) Summit Meeting
The Asia Zero Emission Community (AZEC) Summit Meeting was held on December 18, 2023, seizing the opportunity of the Special Summit Meeting for the 50th Anniversary of ASEAN-Japan Friendship and Cooperation. Prime Minister Kishida (at the time), Minister of Economy, Trade and Industry Saito (at the time), and other Japanese officials attended the meeting, joined by leaders from AZEC partner countries. Discussions focused on the framework and initiatives of AZEC.
Our project was highlighted as one of the case on efforts toward decarbonization in Asia. While most projects are still in the preliminary stages, such as creating letters of intent (LOI) or entering Memorandums of Understanding (MOU), cooperation agreements, or basic agreements primarily involving major entities such as trading houses, power and gas companies, and financial institutions, this project was evaluated as a project that has already progressed to the commercialization stage.
Selected as a 2024 Outstanding Project by PT. Sarana Multi Infrastruktur Persero, Indonesia's state-owned development bank
OTE, the special purpose company that is the main body of the Tonga Hydro Power Project, was selected as one of eight excellent projects from among approximately 140 projects by SMI, for implementing excellent projects.
SMI is a state-owned development bank, that is a wholly owned by the Ministry of Finance of Indonesia, and plays a key role in promoting infrastructure development projects within the country. SMI and OTE entered into a project finance agreement for the Tongar Hydro Power Project, securing financial support to advance the project.
SMI prioritizes the principles of Environmental and Social Safeguards (ESS) in all of the loans that it provides, overseeing the Environmental and Social Due Diligence (ESDD) assessments and the implementation of Corrective Action Plans (CAPs) for environmental and social management, and evaluates borrowers' compliance and performance levels.
During the evaluation period from July 2023 to July 2024, OTE was evaluated for its proper and complete implementation of the CAP in the Tongar Hydro Power Project and was selected as a project with good environmental protection, social safeguards, and repayment performance.
Tongar Hydro Power Plant completion ceremony
The completion ceremony was held on December 18, 2023 at the Tongar Hydro Power Plant.
The completion ceremony was attended by nearly 100 participants, including representatives from government agencies and financial institutions from Japan, while also conducting an on-site inspection. As well as local government officials and others who assisted in the completion of the hydro power plant. In the congratulatory speeches, we received greetings from the Embassy of Japan in Indonesia, the Governor of West Pasaman Province, the Ministry of Energy and Mineral Resources, and PT PLN, Indonesia's state-owned electricity company.
The completion ceremony was a vibrant event that incorporated elements from both cultures, including a local dance performance and eye-painting of a darma doll brought from Japan.
Japanese company lead the development of hydro power projects from a majority ownership position
Tongar Hydro Power Project was initially developed solely by an Indonesian company since 2013, including securing various rights and signing a power purchase agreement with PLN. The project had stalled owing to technical and financial issues. However, these issues were resolved through technological optimization and financial support provided by NiX Group's Indonesian subsidiary NIC and NiX Japan. This represents a particularly rare case where a Japanese company, as the majority shareholder, successfully developed and operated its own hydro power plant.
Our local subsidiary, NIC, acted as the owner's engineering and conducted repeated optimization studies to enhance feasibility and profitability, thereby reducing project costs and mitigating risks. During the construction phase, several employees were stationed onsite as the owner's representatives to manage construction work, ensure quality assurance, and manage the construction timeline. By providing technical and managerial support, they played a crucial role in ensuring the successful completion of the project.
Furthermore, by having JV partner PT. Nusa Konstruksi Enjiniring, whose main business is civil engineering, carry out the civil engineering work as the owner's construction, we have created a scheme that can control delays in construction time, cost management, and deterioration in quality.
Also, many local residents are employed in the operation and maintenance of the power plant, and we will continue to foster economic growth in the local community by providing new employment opportunities.
Utilization of BIM/CIM
We are actively incorporating the Construction Digital Transformation (DX) in engineering, and is utilizing BIM/CIM technology for the 3D and 4D models created by NIC for design and construction management. By creating and visualizing a 3D model prior to construction, we were able to share our vision with the construction company, which facilitated interference checks within the structure, allowing us to identify areas with potential construction challenges. And by utilizing BIM360's automatic quantity calculation feature, considerable reductions in errors and rework were achieved along with a decreased workload for routine tasks. In addition, a 4D model was created by integrating project management data—such as time, equipment, and manpower—into the 3D model. This enabled the simulation of construction procedures in alignment with the schedule and facilitated the identification of difference related to structural interferences, delays, and allocated resources.
By clearly visualizing the feasibility and safety of the construction process and sharing unified information from design through construction management with the construction company, we have enhanced the efficiency of project management and improved construction quality.
In addition to daily progress reports, the overall schedule was monitored in real time by reviewing weekly drone shooting of the construction progress. By utilizing BIM360, construction management can now be conducted from remote locations, this enables management across four key locations: the construction site, the Jakarta office, remote work from home, and the Japan headquarters. This approach facilitates a flexible working style, free from the constraints of time and location.
*Check 4D model
Tongar Hydro Power Plant 4D model August 2022
Received the Minister of Land, Infrastructure, Transport, and Tourism Award in the Small and Medium-Sized Enterprise Category at the JAPAN Construction International Awards
We received the Minister of Land, Infrastructure, Transport and Tourism (MLIT) Award in the Small and Medium-Sized Enterprise Category of the 7th JAPAN Construction International Awards for our efforts in the Tongar Hydro Power Project.
This award is intended to further promote the spread of "high-quality infrastructure in Japan" by the MLIT, to raise the international profile and to support the further overseas expansion of Japanese companies. Also, it is expected to increase the interest of the younger generation in the future of the construction industry by informing Japanese people about construction projects that are highly acclaimed overseas and Japanese companies that are active in overseas markets in an easy-to-understand manner.
【Evaluation Points of the Project】
The MLIT has provided an evaluation on the following aspects.
1. By utilizing a project finance agreement with the Indonesia state-owned development bank and securing funding with the support of a Japanese government financial institution, the company established a Singapore-based holding company to serve as the central hub for its overseas operations, also considering business expansion into Southeast Asia, where Feed-in Tariff (FIT) systems are in place to promote the adoption of renewable energy.
2. In accordance with the development of hydro power project, the community road has been paved and is used jointly by the local residents.
3. When roads and public facilities were damaged by the earthquake, the company used its construction equipment and personnel resources to repair public roads free of charge, giving top priority to disaster recovery.
The Tongar Hydro Power Project was Featured in MOU in Preparation for the Asia Zero Emission Community (AZEC) Summit Meeting
The Asia Zero Emission Community (AZEC) Summit Meeting was held on December 18, 2023, seizing the opportunity of the Special Summit Meeting for the 50th Anniversary of ASEAN-Japan Friendship and Cooperation. Prime Minister Kishida (at the time), Minister of Economy, Trade and Industry Saito (at the time), and other Japanese officials attended the meeting, joined by leaders from AZEC partner countries. Discussions focused on the framework and initiatives of AZEC.
Our project was highlighted as one of the case on efforts toward decarbonization in Asia. While most projects are still in the preliminary stages, such as creating letters of intent (LOI) or entering Memorandums of Understanding (MOU), cooperation agreements, or basic agreements primarily involving major entities such as trading houses, power and gas companies, and financial institutions, this project was evaluated as a project that has already progressed to the commercialization stage.
Selected as a 2024 Outstanding Project by PT. Sarana Multi Infrastruktur Persero, Indonesia’s state-owned development bank
OTE, the special purpose company that is the main body of the Tonga Hydro Power Project, was selected as one of eight excellent projects from among approximately 140 projects by SMI, for implementing excellent projects.
SMI is a state-owned development bank, that is a wholly owned by the Ministry of Finance of Indonesia, and plays a key role in promoting infrastructure development projects within the country. SMI and OTE entered into a project finance agreement for the Tongar Hydro Power Project, securing financial support to advance the project.
SMI prioritizes the principles of Environmental and Social Safeguards (ESS) in all of the loans that it provides, overseeing the Environmental and Social Due Diligence (ESDD) assessments and the implementation of Corrective Action Plans (CAPs) for environmental and social management, and evaluates borrowers' compliance and performance levels.
During the evaluation period from July 2023 to July 2024, OTE was evaluated for its proper and complete implementation of the CAP in the Tongar Hydro Power Project and was selected as a project with good environmental protection, social safeguards, and repayment performance.
Tongar Hydro Power Plant completion ceremony
The completion ceremony was held on December 18, 2023 at the Tongar Hydro Power Plant.
The completion ceremony was attended by nearly 100 participants, including representatives from government agencies and financial institutions from Japan, while also conducting an on-site inspection. As well as local government officials and others who assisted in the completion of the hydro power plant. In the congratulatory speeches, we received greetings from the Embassy of Japan in Indonesia, the Governor of West Pasaman Province, the Ministry of Energy and Mineral Resources, and PT PLN, Indonesia's state-owned electricity company.
The completion ceremony was a vibrant event that incorporated elements from both cultures, including a local dance performance and eye-painting of a darma doll brought from Japan.
In April 2019, PT. NiX Indonesia Consulting was established in Indonesia to focus on hydro power, solar power, and other energy projects as its core business. We have employed several Indonesian engineers with extensive experience in hydro power design and the construction of civil engineering infrastructure, who have previously worked with local Japanese general contractors and major global consulting firms. We are establishing a structure that focuses on IPP engineering projects, covering everything from feasibility studies (FS) to planning, design, construction management, and operational management.
In addition, for our own hydro power generation projects, we have developed a system as an owner's engineer that incorporates BIM/CIM technologies such as 3D and 4D model, enabling high-quality project management.
Company Name | PT. NiX Indonesia Consulting |
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Established | April 2019 |
Business Contents | Hydro Power and Solar Power Generation Engineering in Indonesia |
Number of Employees | 11 (7 technical employees and 4 administrative employees) |
Location | Jakarta, Indonesia |
NiX Group is strongly promoting energy business with the aim of solving social issues such as climate change and resolving power shortages in emerging countries, and will contribute to the realization of a decarbonized society and carbon neutrality in both Japan and Indonesia by creating clean energy for the future.
Contributing to local power shortages
We will utilize renewable energy to address climate change issues and local power shortages, contributing to the sustainable quality of life for local residents.
・Contribution to regional electricity demand
・Contributing to the stabilization of energy security
Community Contributions
With the completion of the Tongar Hydro Power Plant, the aim is to employ local residents as staff members at the plant and contribute to the growth of the local economy through their ongoing employment.
・Contribution to economic revitalization through increased tax revenues in the development areas
・Social Infrastructure Development
・Maintenance of public facilities and roads
・Promote employment for local residents
Contribute to the realization of a decarbonized society
By utilizing renewable energy, we aim to contribute to the achievement of greenhouse gas emission reduction targets for both Japan and Indonesia.
・Power generation from renewable energy sources
・Contribute to greenhouse gas reduction targets
・Utilization of the Joint Crediting Mechanism (JCM)
The Joint Credit Mechanism (JCM) was established and is being implemented to quantitatively evaluate Japan's contribution to the reduction and absorption of greenhouse gas (GHG) emissions through the diffusion and implementation of excellent low-carbon technologies, products, systems, services, or infrastructure in developing countries to utilize the results to achieve Japan's reduction targets. JCM allows Japanese companies to implement projects in cooperation with local companies in partner countries, etc., and to obtain “credits” for the amount of CO2 and other GHG emission reductions reduced or absorbed in the projects, which can then be used to achieve Japan's GHG reduction targets. The credits obtained through the JCM scheme can be used for carbon offsetting and can be transferred and traded through the transfer of credits. Currently, Japan, together with 17 other countries, is implementing JCM to combat climate change. This scheme promotes the implementation of the Paris Agreement and the establishment of carbon neutrality, while also contributing to sustainable development in partner countries.
Tongar hydro power project developed in Indonesia was selected by the Ministry of Environment as a “6MW Mini Hydro Power Plant Project in West Pasaman, West Sumatra ” in the “Subsidy Scheme under the FY 2020 Joint Crediting Mechanism (JCM) Financing Programme” (*1), and we promoted the project as the Representative Participant. The project is expected to reduce GHG emissions by 18,319t CO2/year, contributing to the realization of a carbon-neutral society. This project is being implemented in cooperation with the Indonesian and Japanese governments. The GHG reductions calculated from the implementation of this project will be issued as credits, which can be used to help Japan and its partner country, Indonesia, achieve their GHG reduction targets.
(*1) Subsidy Scheme: This project aims to reduce GHG emissions in developing countries, etc. by utilizing superior decarbonization technologies and other means and to conduct measurement, reporting, and verification (MRV). The objective is to reduce GHG emissions in developing countries, etc., and to contribute to the achievement of GHG emission reduction targets in Japan and partner countries through JCM. The subsidy is up to one-half of the initial investment costs for excellent decarbonization technologies, etc.
As a business operator, this not only improves the profitability of the project but also has significant implications for the SDGs and ESG guidelines as a company. We have been promoting renewable energy business in Japan and overseas with the aim of solving social issues such as decarbonization and alleviating electricity shortages, and we will continue to fulfill our social responsibility further by expanding our business both in Japan and overseas. We will also strive to increase the amount of renewable energy in Indonesia and contribute to achieving a realistic energy transition in the country.