Laos is widely associated with hydropower, but coal has developed into a significant part of its electricity-export strategy. Hydropower supplied approximately three-quarters of Lao electricity generation in 2023, while coal provided most of the remaining large-scale output. Unlike the country’s dams, however, its main coal facilities are designed primarily around long-term sales to neighboring markets.
This gives coal a distinctive position in Laos. It is not spread throughout the national power system or supported by a large domestic industrial market. Instead, the sector is concentrated around integrated mines, power plants, transmission lines, and cross-border power purchase agreements. The operating Hongsa complex supplies Thailand, while a major new project in Xekong Province is intended to send electricity to Cambodia.
Hongsa Established the Lao Coal Industry
The Hongsa Power Plant in Xayaboury Province transformed coal from a relatively small mining activity into a major electricity business. The 1,878-megawatt facility was completed in 2016 and remains the largest operating power station in Laos.
Hongsa is a mine-mouth lignite plant. Its generating units were built next to the coal deposit, avoiding the cost of transporting large amounts of lower-quality lignite over long distances. The wider development includes the open-pit mine, power station, water infrastructure, roads, transmission assets, and other supporting facilities.
The project is operated by Hongsa Power Company, which was established by Thailand’s Banpu Power, RATCH Group subsidiary RH International, and the Lao state-owned Lao Holding State Enterprise. This ownership structure reflects the plant’s regional purpose. Most of its electricity is sold to Thailand, and plant dispatch is linked to the requirements of the Electricity Generating Authority of Thailand.
Hongsa therefore operates differently from a conventional power station built mainly to serve domestic cities and industries. Its commercial foundation is a long-term export relationship connecting a Lao lignite deposit with Thailand’s much larger electricity market.
The plant provides Laos with export income, government revenue, employment, and infrastructure investment. It also gives Thailand access to firm generating capacity located outside its borders. For Laos, this model turns a domestic mineral resource into an electricity export rather than exporting the coal itself.
Mine-Mouth Generation Defines Coal Production
Laos does not have a large nationwide coal supply chain comparable to those of Indonesia, China, or Vietnam. Its coal industry is closely tied to individual power developments.
Lignite is the most important coal type in the Lao power sector. It normally contains more moisture and produces less energy per tonne than higher-grade thermal coal. Transporting it over long distances can therefore be uneconomic. Building the generating station beside the mine allows the fuel to move directly from extraction and preparation areas to the power plant.
This integrated model reduces exposure to international coal prices and maritime transport costs. Hongsa does not depend on imported fuel arriving through a port, while the proposed Xekong development is also connected to local coal resources. Fuel security is built into the project design as long as the mines continue to supply the required volume and quality.
The approach also concentrates environmental and operational risks in the project area. Open-pit mining changes land use and drainage patterns, while the plant requires water, ash disposal areas, emissions-control systems, and continuous management of the mine site. Roads, reservoirs, transmission corridors, and worker settlements expand the physical footprint beyond the generating units.
Coal production in Laos is therefore best understood as part of an integrated electricity-export industry. Mine output, power generation, transmission capacity, and foreign sales are economically connected.
Xekong Extends the Coal-for-Export Model
Laos began construction of another major coal power development in Xekong Province in April 2025. The planned facility has a total capacity of 1,800 megawatts, divided among six 300-megawatt generating units.
The project is being developed by Phonesack Group and has been presented as an investment of approximately US$4 billion. Under its planned schedule, the first unit is expected to begin operating in January 2028, with all six units targeted for completion by January 2030.
As with Hongsa, the main market is outside Laos. Electricity from the Xekong plant is intended for export to Cambodia under a power purchase agreement with the Cambodian state electricity company. The project is expected to operate under a long concession extending beyond the completion of construction.
If the full development enters service, it would almost double Laos’s operating coal-fired capacity. It would also create a second major center of coal production in the south of the country, separate from Hongsa in the northwest.
The location is commercially important. Xekong Province is closer to Cambodia, allowing the plant to connect with the intended export market through dedicated transmission infrastructure. The project would support Cambodia’s demand for firm electricity while giving Laos another source of long-term export revenue.
Its progress will depend on whether construction, mining, transmission, and financing remain aligned. A power purchase agreement provides an intended customer, but a project of this scale must also manage cost increases, technical delays, fuel preparation, environmental requirements, and cross-border grid coordination.
Coal Provides Firm Power in a Hydropower-Led System
Hydropower remains the foundation of Laos’s electricity sector and its regional identity as an energy exporter. Coal serves a different function by providing output that is not directly affected by rainfall or reservoir levels.
This distinction is important during dry periods. Hydropower generation can decline when water availability is low, even while electricity demand and contractual export obligations continue. A coal station can operate throughout the year if fuel, water, and equipment remain available.
However, export-oriented coal capacity does not automatically solve every domestic electricity problem. Parts of Laos may still experience supply constraints because power plants, demand centers, and transmission networks are not always located within the same system. Laos has also imported some electricity during dry periods despite being a major regional exporter.
Hongsa is largely dispatched for Thailand, while the Xekong project is structured around Cambodian sales. Their output is governed by commercial arrangements and dedicated infrastructure rather than by domestic demand alone. As a result, Laos can export large amounts of electricity while still needing grid investment, stronger internal connections, and better coordination between domestic and export systems.
Coal improves the diversity of generating resources, but transmission remains central to whether electricity reaches the areas where it is needed.
Environmental and Financing Pressures Shape New Development
Large coal projects bring land, water, air-quality, and community impacts. At mine-mouth developments, mining and generation occur within the same area, concentrating dust, ash, wastewater, heavy equipment, and industrial emissions.
The Hongsa project required land acquisition, resettlement, livelihood-restoration programs, and long-term environmental monitoring. Communities and advocacy groups have raised concerns about air pollution, water quality, health effects, and the movement of people from affected land. Similar issues will require continued attention as new mining and power infrastructure develops in Xekong Province.
Financing presents another constraint. International banks, export-credit institutions, and development organizations have reduced their support for unabated coal power. The number of lenders willing to participate in new projects is smaller than it was when Hongsa was financed.
This can increase dependence on project developers, regional investors, equipment suppliers, and the expected electricity buyer. It also makes long-term power contracts more important because lenders require confidence that electricity sales will support repayment.
Laos must balance potential export earnings against long construction periods and the risk of committing capital to assets that may operate for several decades. Thailand and Cambodia are both increasing renewable energy development, while international climate policies are placing greater pressure on coal generation.
Regional Electricity Sales Will Determine Coal’s Future
Coal is likely to remain a visible part of the Lao energy sector because Hongsa is an established operating asset with a dedicated mine and export arrangement. The more important question is whether the Xekong development reaches its planned schedule and full capacity.
The future of Lao coal will not be determined mainly by domestic household demand. It will depend on regional electricity purchases, cross-border transmission, project finance, mine performance, and the energy policies of neighboring countries.
If the Cambodian agreement supports completion of all six Xekong units, Laos will strengthen its position as an exporter of both hydropower and coal-fired electricity. If financing, construction, or regional demand weakens, expansion may proceed more slowly than announced. Coal’s role in Laos is therefore concentrated but strategically important: it converts local lignite into firm power for the wider Southeast Asian electricity market.
