Bhutan possesses one of the world’s most distinctive renewable energy systems. Rivers descending from the Himalayas supply almost all of its electricity, large hydropower plants generate substantial export revenue, and close cooperation with India has financed projects that would otherwise be difficult for a small landlocked economy to develop.
Yet Bhutan’s renewable advantage contains a significant contradiction. The country can export large amounts of clean electricity during the wet season while importing power when winter river flows decline. Domestic demand is also growing as homes, businesses, industries and new economic projects consume more electricity.
Bhutan’s next energy phase will consequently involve more than building additional dams. The country is attempting to expand hydropower while adding solar, wind, storage and stronger transmission infrastructure. The purpose is not to replace hydro, which will remain the centre of the system, but to reduce seasonal vulnerability and create a renewable portfolio better matched to domestic needs.
Hydropower Is Both an Energy Resource and an Economic Strategy
Bhutan’s mountainous terrain and fast-flowing rivers provide an unusually large hydropower resource relative to the size of its population and economy. Projects such as Chukha, Kurichhu, Tala and Mangdechhu have turned this geographic advantage into generating capacity, government revenue and electricity exports.
Hydropower has influenced Bhutan’s development model in ways that extend well beyond the power sector. Export earnings help support public finances and provide foreign exchange, while access to electricity has improved living conditions and created opportunities for industrial activity.
The relationship with India is central. India has supplied financing, engineering support, construction expertise and a large market for Bhutanese electricity. Bhutan, in turn, provides renewable power that can support demand in the Indian grid. Long-term bilateral cooperation has made hydropower one of the strongest economic connections between the neighbouring countries.
The commissioning of the 1,020-megawatt Punatsangchhu-II project in 2025 increased Bhutan’s generating base substantially. Additional projects involving Bhutanese and Indian public or private companies could expand capacity further, reinforcing Bhutan’s role as a renewable electricity exporter.
However, large hydropower carries financial and project-management risks. Mountainous construction conditions can produce geological surprises, schedule delays and cost increases. When projects depend heavily on external financing, rising costs can also increase debt exposure.
Hydroelectric development therefore involves a balance between long-term export revenue and the immediate financial burden of construction. Bhutan’s resource potential is considerable, but projects must be selected and executed according to realistic demand, financing and environmental conditions.
A Country That Exports Electricity Can Still Face Winter Shortages
Bhutan’s electricity trade follows the seasonal rhythm of its rivers. During the monsoon and other high-flow periods, hydropower plants can produce more electricity than the domestic market requires. The surplus is exported, primarily to India.
During the dry winter months, river flows fall and output from run-of-river plants declines. At the same time, domestic electricity demand can remain high or increase. Bhutan then imports electricity from India, despite being a major renewable power exporter during other parts of the year.
This pattern demonstrates the difference between annual energy abundance and year-round energy security. A country may generate a large renewable surplus over twelve months but still lack enough firm electricity during particular seasons or hours.
The issue is becoming more important as Bhutan’s domestic demand grows. Electrification, urban development, industrial expansion, heating needs and digital infrastructure all place additional pressure on the system. Large new economic projects could raise demand much more quickly than historical consumption patterns suggest.
Hydropower projects with reservoir storage can help by retaining water for later use, but many Bhutanese plants are primarily run-of-river facilities. Their generation is closely tied to natural river flows. Building additional projects of the same type may increase wet-season exports without fully solving winter shortages.
Bhutan must therefore assess new capacity not only according to annual generation but also according to when the electricity will be available. The strategic value of a project that produces during scarce periods may be greater than that of a larger plant whose output arrives when the system already has a surplus.
Solar Power Can Complement Bhutan’s Rivers
Solar energy offers Bhutan an important seasonal advantage. Many areas receive strong sunlight during the dry winter months, when hydropower output is weakest. Solar generation therefore has the potential to complement the existing system rather than simply duplicating its production pattern.
Bhutan has historically developed very little non-hydro renewable capacity, despite estimates indicating substantial solar potential. That gap is beginning to attract greater policy attention. Utility-scale solar plants, rooftop systems and installations serving public institutions or remote communities could all contribute to diversification.
Solar projects are generally faster to construct than large hydropower stations and can be developed in smaller stages. This allows capacity to be added according to demand rather than requiring a single major investment. Distributed solar may also reduce pressure on local networks by producing electricity closer to where it is consumed.
Land availability remains a constraint. Bhutan’s terrain is mountainous, settlements are dispersed and much of the country is forested or environmentally protected. Large flat sites are limited, while competing uses include agriculture, housing and infrastructure.
Careful site selection will consequently be necessary. Rooftops, industrial areas, public land and locations near substations may offer better opportunities than extensive greenfield development. Floating solar on suitable reservoirs could eventually provide another option, although local technical and environmental conditions would need to be assessed.
Solar will not rival hydropower’s scale in the near term. Its value lies in improving the timing, diversity and resilience of Bhutan’s renewable electricity supply.
Wind, Biomass and Small Systems Have More Targeted Roles
Bhutan also has wind resources, although their quality varies considerably by location. The country’s early wind installations demonstrated the technology’s potential but did not create a large commercial industry. Further development will depend on detailed resource measurements, road access, grid connections and the ability to transport turbine components through difficult terrain.
Wind may be particularly useful where its seasonal production complements hydropower and solar. A small number of well-positioned projects could provide more system value than a broad development programme in areas with weaker resources.
Bioenergy remains relevant because many households have traditionally relied on fuelwood for cooking and heating. Modern biomass systems, biogas and efficient stoves can reduce pressure on forests and improve indoor air quality, especially where full electrification of thermal demand is difficult.
Small hydropower and stand-alone renewable systems can serve remote settlements that are costly to connect to the national network. Bhutan has achieved broad electricity access, but distributed systems may still strengthen reliability in isolated communities and provide backup during network interruptions.
These technologies will remain secondary to large hydropower in terms of total generation. Their purpose is to address needs that large central plants do not always meet efficiently.
Diversification Has Become National Energy Policy
Bhutan’s National Energy Policy 2025 places strategic hydropower development alongside accelerated growth in other renewable sources. This represents an important shift in emphasis. Hydropower remains the country’s principal asset, but diversification is now treated as a requirement for resilience rather than an optional environmental programme.
Storage will be central to that effort. Batteries can shift solar electricity from daytime into evening hours, support remote networks and provide short-term grid services. They cannot independently solve an entire winter supply gap, but they can reduce peak imports and improve the use of domestic generation.
Transmission development is equally important. New power plants require lines capable of moving electricity to domestic demand centres and export interconnections. Bhutan’s mountainous landscape makes such construction expensive, while landslides, floods and severe weather can threaten existing assets.
Climate change adds another layer of uncertainty. Altered snowmelt, changing monsoon patterns, extreme rainfall and glacial risks can affect river flows and infrastructure. Hydropower is renewable, but it is not insulated from environmental change.
Bhutan’s renewable strategy must therefore protect watersheds, strengthen project design and avoid treating historical hydrological patterns as permanent guarantees.
Bhutan’s Next Advantage Will Come From Timing, Not Only Volume
Bhutan will remain a hydropower country. Its rivers provide an economic resource of national importance, and electricity cooperation with India offers access to capital and a market far larger than Bhutan could create domestically.
The main strategic question is now how to convert that resource into a more reliable year-round system. Additional hydroelectric capacity can increase exports and support growth, but projects must account for seasonal output, construction risk and rising domestic demand.
Solar generation, selected wind development, storage and stronger networks can reduce the mismatch between wet-season abundance and winter scarcity. These investments will not weaken Bhutan’s hydropower model. They can make it more dependable.
Bhutan’s renewable future will be determined not only by how much electricity its rivers can generate, but by whether the country can supply power when its economy needs it most.