Upper Marsyangdi A

Summary

Upper Marsyangdi A is a 50 MW operating run-of-river plant on the Marsyangdi River in Lamjung District — the upstream anchor of the 170 MW Marsyangdi cascade. Developed by Sinohydro-Sagarmatha Power Company (a Sino-Nepali joint venture), the plant signed its PPA in 2010 and commissioned around 2016–2017, making it one of the earlier private IPP projects on the Marsyangdi system.

Specifications

Specifications (NEA IPP Registry)

The Marsyangdi Cascade — Upstream Anchor

Upper Marsyangdi A sits at the head of one of Nepal's most productive hydropower corridors. The Marsyangdi River, originating in the Annapurna massif near Manang, hosts three projects in sequence:

As the uppermost project, Upper Marsyangdi A's operations — particularly sediment management at its intake and flow diversion through the headrace — directly affect water quality and discharge timing for the downstream plants. This is the cascade dependency that Nepal's hydropower planning rarely accounts for in project-level PPA economics: the upstream plant's design discharge determines how much the downstream plant receives, and the downstream PPA cannot charge back for upstream externalities.

Learning Curve Asset

Upper Marsyangdi A serves as a benchmark for the cost and performance assumptions embedded in newer Marsyangdi developments. Because it commissioned approximately 7–8 years before Marsyangdi Besi (the downstream under-construction plant), its operational history should inform the financial models used to justify the downstream project.

Key questions a full analysis would answer:

1. Build cost vs budget. The Sinohydro-Sagarmatha joint venture used a Chinese contractor model. The actual cost per MW — and how it compared with the NPR 200–300 million/MW industry-average range at the time — would calibrate the cost assumptions for Marsyangdi Besi.

2. PLF vs contracted energy. Madhya Marsyangdi achieves 107.6% of design from the same river system. If Upper Marsyangdi A performs similarly, the Marsyangdi basin may be systematically under-designed relative to actual hydrology — the Chilime pattern at cascade scale.

3. Maintenance cost trajectory. As the plant approaches 10 years of operation, the maintenance cost curve — routine overhauls, sediment wear on turbine runners, desander basin cleaning frequency — becomes a real dataset for predicting lifecycle costs on the same river.

4. Sediment management. Upstream plants on steep Himalayan tributaries handle the highest sediment loads. How Upper Marsyangdi A manages its intake desander — and what passes through to the headrace — determines turbine wear at both this plant and Madhya Marsyangdi downstream.

The NEA annual reports cover NEA-owned plants in detail but do not publish private IPP generation data. Upper Marsyangdi A's actual performance data would need to come from the developer's annual reports, ICRA Nepal surveillance ratings, or the DoED generation monitoring database.

Why the Upstream Plant Matters to the Cascade

When Upper Marsyangdi A diverts river flow through its headrace tunnel, it reduces the flow available to Madhya Marsyangdi's intake downstream. If the upstream plant's design discharge is close to the river's dry-season flow — and both plants are running at full peaking capacity — the downstream plant may face water scarcity in low-flow months. This is a regulatory problem, not just an engineering one: Nepal's water allocation framework does not cascade-bind PPA obligations, so the downstream developer has no contractual remedy against reduced inflow from upstream operations.

This makes Upper Marsyangdi A a case study in why the Marsyangdi basin — and Nepal's cascade-heavy river systems generally — needs integrated water accounting rather than project-level licensing. See Gandaki Basin and Seasonal Mismatch.

Limitations & Controversies

Regulatory gap in cascade water allocation. Nepal's water allocation framework does not cascade-bind PPA obligations. When Upper Marsyangdi A diverts river flow through its headrace, the downstream plant (Madhya Marsyangdi) has no contractual remedy against reduced dry-season inflow — a problem the current licensing structure does not address.

Opaque operational data. NEA annual reports cover NEA-owned plants in detail but do not publish private IPP generation data. Upper Marsyangdi A's actual performance — PLF, maintenance cost trajectory, and sediment wear rates — is not publicly available, limiting its usefulness as a benchmark for downstream projects.

Sediment management externality. As the uppermost plant in the cascade, Upper Marsyangdi A's intake desander performance and headrace sediment passage directly affect turbine wear at Madhya Marsyangdi downstream. This operational interdependence is not priced or regulated across project boundaries.

Sources

• NEA Annual Report FY 2024/25

See also

• Madhya Marsyangdi — the downstream 70 MW plant, operating at 107.6% of design
• Gandaki Basin — the Marsyangdi feeds the Narayani / Gandaki system
• Run-of-River Hydropower
• Chilime — the conservative-design overperformance pattern, at smaller scale
• Seasonal Mismatch — the structural limitation even well-performing RoR cannot fix