Overview

The Mai Hydropower Project is a run-of-the-river (RoR) hydroelectric power station located in the Ilam District of eastern Nepal. Developed by an Independent Power Producer (IPP), this project exemplifies the growing role of the private sector in Nepal’s renewable energy landscape. It harnesses the power of the Mai Khola (Mai River), a perennial river system flowing from the Mahabharat Range.

• Installed Capacity: 22 MW

• Commissioned: February 2015

• Project Type: Run-of-the-river

• River: Mai Khola (Mai River)

• Developer/Operator: Sanima Mai Hydropower Ltd.

Key Features

• Location: Mabu and Sulubung VDCs, Ilam District, Province No. 1

• Turbines: 2 x 11 MW Francis-type turbines

• Design Discharge: 15.9 m³/s

• Gross Head: 169 meters

• Annual Generation: Approx. 129 GWh

• Transmission Line: 132 kV line connected to the Godak substation

Significance of the Mai Project

1. Private Sector Leadership

Mai Hydropower is one of Nepal’s flagship IPP projects, developed by Sanima Mai Hydropower Ltd., a subsidiary of Sanima Hydro Group. It reflects growing confidence in private investment in Nepal’s energy sector.

2. Boosting Energy in Eastern Nepal

The project significantly contributes to the power needs of Province No. 1, especially during peak demand, and supports local industry and electrification.

3. Environmental Sensitivity

The project was designed with minimal environmental disruption:

• No major reservoir (run-of-the-river design)

• Proper aquatic life passage

• Environmental Impact Assessment (EIA) completed and implemented

Technical Specifications

Socio-Economic Impact

• Job Creation: Provided employment during construction and continues to support local workforce in operations.

• Local Development: Developer contributed to road building, school support, and rural electrification in Ilam.

• Electricity Access: Improved stability and reach of power supply in eastern Nepal.

Challenges Faced

• Remote Terrain: Difficult access and logistics due to rugged hills of Ilam.

• Monsoon Risks: Landslides and sedimentation during rainy season impact operational efficiency.

• Power Evacuation: Initially constrained by transmission capacity, later addressed by grid improvements.

Interesting Facts

• The Mai project was one of the first IPP projects to be developed entirely with domestic equity and loans, making it a model for Nepal’s energy independence.

• The project area lies in Ilam, a district famous for its tea estates and lush hills, which offers potential for energy-eco tourism.

• The success of Mai Hydropower led to the development of the Mai Cascade Hydropower Project (7 MW), downstream of the same river.

Future Prospects

• Upgrades in automation and SCADA systems for better operational control

• Integration with smart grid infrastructure planned by NEA

• Exploration of hybrid systems, such as adding floating solar on nearby water surfaces

Conclusion

The Mai Hydropower Project is a shining example of Nepal’s evolving energy sector—one that increasingly leverages private capital, community partnerships, and sustainable design. With its efficient use of the Mai River and regional economic impact, the project continues to light up homes, businesses, and futures in eastern Nepal.