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Dorjilung Hydroelectric Power Limited seal
རྡོ་རྗེ་ལུང་གློག་མེ་ཚད་འཛིན།
DORJILUNG HYDRO POWER LIMITED
1,125 MW
Installed Capacity
2032
Planned Commissioning
USD 1.7B
Estimated Cost
72 Months
Construction Period

Project Overview

The Dorjilung Hydroelectric Power Project (DHPP) is one of Bhutan's most important national infrastructure initiatives. It is envisioned as a transformational 1,125 MW run-of-river project that will significantly strengthen the country's long-term energy security, economic development, and commitment to low-carbon growth. Recognized as a national priority by His Majesty the King, DHPP represents a modern approach to hydropower development, one that emphasizes strong environmental and social safeguards, adherence to international best practices, and a transparent Public-Private Partnership model between Druk Green Power Corporation Limited (DGPC) and Tata Power Company Limited of India. Supported by the financial and technical expertise of the World Bank Group, the project is expected to become a leading example of sustainable hydropower development in South Asia.

Location & Description

Eastern Bhutan, along the right bank of the Kurichhu River. Major components in Mongar, with portions extending into Lhuentse Dzongkhag. Dam site is about 1 km upstream of Rewan village; powerhouse is near Lingmithang. The area has comparatively good accessibility and a smaller environmental footprint than hydropower projects of similar scale.

Reservoir designed to provide 3–8 hours of daily peaking power. Water diverted for generation returns to the river through two tailrace tunnels.

Partnership & Financing

  • Joint venture: DGPC 60% equity, TCPL (Tata Power) 40%
  • Dorjilung Hydroelectric Power Limited (DHPL) incorporated to develop, operate, and maintain
  • Concession agreement with the Royal Government of Bhutan: 30 years
  • Estimated cost: USD 1.7 billion
  • Debt-equity ratio: 70% debt / 30% equity
  • Lead multilateral financier: World Bank Group (concessional financing + technical guidance)

Socio-Economic Impact

  • Estimated 4,000–5,000 direct and indirect jobs per year during construction
  • Benefits cited: business opportunities, housing and transport demand, improved access roads, market activity for food and services
  • Surplus power to be exported to India, especially valuable in summer when regional demand peaks

Environmental & Social Safeguards

Studies completed: Biodiversity Management Plan, Cultural Heritage Management Plan, Cumulative Impact Assessment (CIA) Addendum, Gender and Vulnerability Action Plan, Land Acquisition and Livelihood Restoration Plan (LALRP), Stakeholder Engagement Plan, SEA/SH Action Plan. All publicly disclosed.

Safeguard Measures

  • 53 affected parties identified; 1 household requiring physical relocation
  • Compensation at replacement cost, livelihood restoration support, transitional allowances
  • Grievance channels: phone, SMS, dedicated committees, social media, walk-in offices
  • Labour influx managed via codes of conduct, cultural orientation, managed worker camps, community health and safety plans with local authorities, police, and forestry

Dam Safety

Overseen by an international panel of experts. Includes real-time vibration monitoring, construction supervision and QA systems, detailed instrumentation plans, and an emergency preparedness plan. Approach informed by past Bhutanese and international projects on sediment management, slope stability, groundwater behaviour, and structural integrity.

Hydrology & Catchment

Catchment Area 8,782 km² (5,813 km² outside Bhutan)
Design Flood 16,225 m³/s
Check Flood 20,123 m³/s
Design Discharge 451 m³/s
Dewatered River Reach About 16 km (dam to tailrace outlet)

Reservoir Characteristics

Gross Storage 44.17M m³
Live Storage 12.62M m³
Reservoir Area (FRL) 145.82 ha
Full Reservoir Level EL. 850 m
Min. Drawdown Level EL. 840 m

Dam & Spillway

Type Concrete Gravity (RCC and CVC)
Top Level EL. 853.0 m
Length at Crest 241.0 m
Maximum Height 139.5 m (~85 m above riverbed)
Spillway Bays 6 gated
Spillway Gate Size 9.0 m (w) × 15.10 m (h)

Water Conveyance System

Headrace Tunnel Single, 14,974 m long
HRT Diameter 11.0 m (concrete-lined)
Surge Shaft Single, restricted-orifice type
Surge Shaft Size 135 m high × 4.1 m diameter
Pressure Shafts 3 × 332.8 m long
Pressure Shaft Diameter 5.5 m (steel-lined)

Powerhouse & Tailrace

Type Underground Cavern
Dimensions 210 × 23 × 60.5 m
Tailrace Tunnels 2 (350 m & 360 m long)
Tailrace Shape / Diameter Horseshoe, 8.0 m
Normal Tail Water EL. 544.0 m

Power Generation & Energy Output

Installed Capacity 1,125 MW (6 × 187.5 MW Francis units)
Gross Head 300.45 m
Design Energy 4,504 GWh
Firm Power 153 MW

Project Implementation Schedule

Planned Completion & Commissioning 2032
Construction Period 72 months

Access Infrastructure

Access Roads 29.10 km
Major Bridges 2