Upper Tamakoshi Hydroelectric Projectमाथिल्लो तामाकोशी जलविद्युत आयोजना
Nepal's largest hydropower plant, on the Tamakoshi River at Lamabagar, Dolakha. A peaking run-of-river scheme developed by Upper Tamakoshi Hydropower Ltd (an NEA subsidiary) and financed almost entirely by domestic institutions — the Employees Provident Fund, Citizen Investment Trust, NEA and citizen investors. First units came online in July 2021, with the full 456 MW from September 2021.
Installed capacity
456 MW
Peaking run-of-river
River / basin
Tamakoshi
Koshi basin
Location
Dolakha
Bagmati
Commissioned
2021
Operational
Milestones to commissioning
The route from construction to commercial operation.
- 2010
Construction began
- 5 Jul 2021
First units inaugurated; generation started
- 9 Sep 2021
Full 456 MW commercial operation (all 6 units)
Location
Approximate dam-area location on OpenStreetMap — precise to the district and river reach, not the exact structure.
Upper Tamakoshi Hydroelectric Project: key facts
Quick answers on capacity, river, developer, status and commissioning, drawn from the sourced data above.
What is the capacity of the Upper Tamakoshi Hydroelectric Project?+
The Upper Tamakoshi Hydroelectric Project has an installed capacity of 456 MW. It is a peaking run-of-river hydropower scheme.
Which river is the Upper Tamakoshi Hydroelectric Project on?+
The project is on the Tamakoshi River, part of Nepal's Koshi basin, in Dolakha district, Bagmati Province.
Who is developing the Upper Tamakoshi Hydroelectric Project?+
The Upper Tamakoshi Hydroelectric Project is developed by Upper Tamakoshi Hydropower Ltd (nea subsidiary).
What is the status of the Upper Tamakoshi Hydroelectric Project?+
As of mid-2026 the project is operational.
When was the Upper Tamakoshi Hydroelectric Project commissioned?+
The Upper Tamakoshi Hydroelectric Project was commissioned in 2021.
Sources & data note
Figures for Upper Tamakoshi Hydroelectric Project are compiled from the sources below and cross-checked where possible. Status and projected dates reflect research as of mid-2026 and may change as the project progresses. The map location is an approximate dam-area estimate. Commentary is Amarnepal's own.