Solar power is helping Bhutan maintain its carbon-negative status for future generations

Country or Region Overview

Country or Region: Kingdom of Bhutan

Capital: Thimphu

Total Population: Approximately 780,000 (as of 2025)

Geographical Location: Bhutan is a landlocked country in the Eastern Himalayas, bordered by China to the north and India to the south, east, and west. The country is mostly mountainous, with elevations ranging from 200 meters to over 7,000 meters, and its population is scattered across valleys and highland plateaus. Bhutan’s unique geography presents both opportunities and challenges for solar energy deployment, particularly in off-grid rural electrification and backup energy for remote villages.

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Solar Irradiation Data in Kingdom of Bhutan

While Bhutan is known for its hydropower, it also receives strong solar radiation, especially in its lower altitude and southern regions.

Key Solar Irradiation Data:

Annual Solar Irradiation: Around 4.0 to 5.5 kWh/m²/day
Sunshine Hours: Estimated between 2,000 to 2,500 hours/year
Best Locations: Samtse, Sarpang, Tsirang, Zhemgang, and lower parts of Punakha and Wangdue Phodrang

These levels make Bhutan suitable for off-grid PV, rooftop solar, and hybrid systems, especially in places where extending the grid is not practical.

If you need to learn more solar power potential in Bhutan, please feel free to contact Solarvance for more details.

Temperature Factors in Kingdom of Bhutan

Bhutan has a wide climate range, from subtropical in the south to alpine in the north.

Southern lowlands: Summer highs reach 30–35°C, with mild winters
Central valleys: Cooler year-round, winter lows around 0 to 5°C
Northern highlands: Cold and snowy, winter lows below -10°C

Design tips:

Use cold-weather-rated batteries and enclosures for high-altitude systems
Avoid overheating by choosing ventilated inverters in warmer zones
Select panels with high efficiency under cooler temperatures

Energy Demand and Grid Situation in Kingdom of Bhutan

Bhutan has a high electrification rate (98%+), powered primarily by hydropower, which the country also exports to India. However, seasonal shortages and remote location challenges persist.

Utility provider: Bhutan Power Corporation (BPC)
Main source: Hydropower (>95% of generation)
Challenges: Seasonal fluctuations in water availability and isolated communities

Solar offers a resilient complement to hydropower, especially during dry seasons and in off-grid areas.

Preferred System Type in Kingdom of Bhutan

Bhutan’s varied terrain and grid conditions call for diversified solar system solutions:

Off-Grid PV Systems: For mountain villages, monasteries, and schools in non-grid areas
Hybrid Systems: For critical infrastructure, telecom sites, and health centers
Rooftop Grid-Tied Systems: In urban centers like Thimphu, Paro, and Phuentsholing
Solar Street Lighting: Valuable for rural and tourism-related infrastructure

Energy storage is vital in most systems for night-time use and grid independence.

Dust and Sand Factor in Kingdom of Bhutan

Dust is not a major issue in Bhutan, due to its green landscapes and high humidity, although roadside and construction zones may collect light surface dust.

Cleaning recommendations:

Periodic panel cleaning every 2–3 months
Install systems away from unsealed roads and traffic dust zones
Rainfall naturally helps to keep panels clean in most areas

Humidity and Rainfall (Humidity Factor) in Kingdom of Bhutan

Bhutan experiences high rainfall and humidity, especially during the monsoon season (June to September).

Humidity: Often between 70–90%, especially in southern and central zones
Rainfall: Ranges from 500 mm/year in the north to 5,000 mm/year in the south

Mitigation tips:

Use IP66-rated waterproof enclosures and components
Design systems with elevated racking and good drainage
Apply moisture protection for battery banks and electronics

Ocean (Salt Corrosion Factor) in Kingdom of Bhutan

Bhutan is a landlocked country, with no exposure to sea air or salt corrosion concerns.

Standard construction materials and coatings are sufficient for all system types.

Government Policies and Solar Incentives in Kingdom of Bhutan

Bhutan is slowly integrating solar into its national strategy, as a complementary source to hydropower and energy security enhancement.

Policy highlights:

Renewable Energy Master Plan includes solar in rural electrification and climate resilience
Support from international donors and organizations like ADB, UNDP, and Japan International Cooperation Agency
Pilot projects launched for rooftop solar, solar pumping, and solar for schools and clinics
Net metering and feed-in tariffs are under discussion but not yet widely implemented

The focus is on energy access and backup power for remote areas.

ROI on Solar Systems in Kingdom of Bhutan

Solar installations in Bhutan provide good ROI, particularly for rural electrification, diesel replacement, and institutional use.

ROI Period:
- Off-grid systems for homes/schools: 3–5 years
- Hybrid or commercial systems: 4–6 years depending on location and use
Post-ROI benefits: Energy reliability, fuel savings, and carbon reduction
Financing: Often supported by NGOs, grants, or government-backed programs

Solar helps reduce diesel dependence and supports resilient development.

Conclusion on Solar Power in Kingdom of Bhutan

Bhutan offers a unique opportunity for high-impact solar development, particularly in remote mountain communities and as a support system to its hydropower base. With reliable sunshine in lower altitudes and a focus on green growth, solar is set to play a greater role in the country’s energy future.

At Solarvance, we provide high-altitude-ready, moisture-protected, and off-grid solar systems designed for Bhutan’s terrain and climate. Whether powering a monastery in Trongsa, a rural school in Samdrup Jongkhar, or a backup system in Thimphu, our solutions bring efficiency and resilience to every corner of the country.

Choose Solarvance for Your Solar System

Contact us today to explore customized solar solutions for your needs, whether you’re interested in grid-connected, off-grid, or hybrid solar systems. Our team at Solarvance is here to guide you through every step of the process, from system design to installation and maintenance.