Nepal's Hydropower System
How Nepal's hydro fleet converts river flow into electricity, and why capacity, dependable energy and buildability must be kept separate.
- Page status
- Verified core
- Updated
- 2026-11-04
- Last reviewed
- 2026-11-04
- Review due
- 2027-02-04
Fleet structure
NEA reports 3,905.902 MW of hydropower in a 4,120.252 MW electricity fleet for FY 2025/26, up from 3,389.912 MW of hydro in FY 2024/25 (NEA Annual Report FY 2025/26, PDF p.185). More than 90% of hydro capacity is commonly classified as run-of-river or peaking run-of-river. Those plants can generate large annual energy volumes but generally cannot move monsoon water into the dry season.
Capacity is not one thing
Four different questions are often collapsed into a single MW figure:
- Installed capacity: nameplate equipment connected to the system.
- Available capacity: what can operate at a particular time after hydrology, outages and maintenance.
- Firm capacity: what planners can depend on during a defined scarcity period.
- Project potential: a screened or unscreened resource estimate, not built infrastructure.
The wiki therefore links project MW to status evidence and treats Firm Power and Installed MW, Energy, Seasonality, and Firm Power Are Routinely Conflated as separate concepts.
The river calendar
Most river discharge arrives during the monsoon. A hydro-heavy fleet can therefore be long on energy in wet months and short in dry months. Adding more run-of-river capacity can deepen both sides of that pattern unless transmission, trade, storage, solar, flexible demand or other balancing resources grow with it. See Seasonal Mismatch.
Buildability and performance
Hydropower outcomes depend on geology, sediment, access, tunnelling, financing, safeguards and evacuation infrastructure—not only head and flow. The project dossiers for Upper Tamakoshi, Arun 3, Dudhkoshi Storage Hydroelectric Project, Upper Karnali and Budhigandaki Hydroelectric Project illustrate different delivery and evidence conditions. A licence, memorandum or financing discussion is not treated as commissioning evidence.
What the evidence does not yet show
The public corpus does not provide a consolidated plant-level series for hourly dispatch, curtailment reason, availability and forced outages. Annual generation data exist for selected plants, but they do not support a current fleet-wide performance ranking.
Related
Run-of-River Hydropower · Storage and System Flexibility · Sediment as Design Constraint · Transmission and Cross-Border Electricity Trade