Lower Bagmati HPP

Project Overview

Lower Bagmati Nadi Hydropower Project (LBNHPP)

The **Lower Bagmati Nadi Hydropower Project** is a Run-of-River (RoR) type scheme with an installed capacity of 20.5 MW. Located in the Lalitpur and Makwanpur districts of Bagmati Province, the project utilizes the perennial flow of the **Bagmati River** to generate clean, renewable energy for the Integrated Nepal Power System (INPS).

Strategically positioned in the Lesser Himalayan midland valley, the project features a 110m gross head and a design discharge of 24.9 m³/s. It is committed to environmental harmony, maintaining a 10% minimum downstream flow for the aquatic ecosystem.

Capacity: 20.5 MW
Annual Energy: 121.75 GWh
Net Head: 94.14 m
Discharge: 24.9 m³/s
Lower Bagmati Project

Technical Specifications

Salient Features of LBNHPP

  • Name of Project: Lower Bagmati Nadi Hydropower Project
  • Location: Bagmati Province, Lalitpur and Makwanpur districts
  • Type of Scheme: Run-of-River (RoR)
  • Gross Head: 110 m
  • Net Head: 94.14 m
  • Installed Capacity: 20.5 MW

  • River Source: Bagmati River
  • Catchment Area: 982.82 km²
  • Design Discharge: 24.9 m³/s
  • Environmental Flow: 0.578 m³/s (10% of minimum monthly flow)
  • Annual Mean Flow: 61.16 m³/s

  • Diversion Weir: Concrete Gravity Weir, 50m length
  • Intake: Side Intake with 4 orifices
  • Approach Canal: Box Duct type, 50m length
  • Settling Basin: Surface type, 3 chambers, 60m length
  • Penstock Pipe: Steel Pipe, 7.5 km length, 3.5m-2.0m diameter

  • Powerhouse Type: Surface Powerhouse
  • Turbine Type: Francis Turbine (Horizontal Axis)
  • Number of Units: 2 Units
  • Annual Energy: 121.75 GWh
  • Transmission Line: 132 kV Single Circuit, 23.5 km length

  • Total Project Cost: NRs. 3895 Million (including IDC)
  • Construction Period: 4 Years
  • Expected Operation Date: 2029

Regional Context

Geography & Accessibility

Lesser Himalayas

The project area lies within the Lesser Himalayan midland valley. The topography is characterized by gentle slopes and multiple stepped terraces reaching heights of up to 20m, providing ideal stability for the powerhouse foundation and civil structures. The regional geology ensures robust bedrock for the diversion weir and intake facilities.

Easy Accessibility

Located only 80 km from Kathmandu, the site is highly accessible via the Kanti Highway and local blacktopped roads. This proximity ensures efficient logistics for equipment transportation and project oversight during the 4-year construction phase, significantly reducing mobilization costs compared to remote sites.

Community Synergy

The surrounding Bagmati-Bakaiya Rural Municipality is home to vibrant agricultural communities. The project is designed to integrate seamlessly with the local ecosystem while providing local employment, infrastructure improvements, and sustainable energy development for the entire Bagmati Province.

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