Recent work by the Stimson Center, IUCN, the University of California-Berkeley, and The Nature Conservancy shows if Cambodia, Lao PDR, and Vietnam take advantage of recent advances in renewable power generation and transmission technologies, they can achieve energy security (defined as the uninterrupted availability of energy sources at an affordable price) at significantly lower social, environmental, and political risks. 

Farmers cat fish on the Mekong River during the flood season. Photo: Duong Van Ni

Water management in the Mekong region is, in practice, dominated by energy objectives. 

In Cambodia, the priority is to substitute domestically produced hydropower for expensive diesel and electricityimports. 

In Lao PDR, the priority is to generate revenue by drawing inforeign investment in dams andexport excess electricity to its neighbors,with Thailand as its biggest market. 

In Vietnam, which has already built outmost of its hydropower potential, the priority is to meet a projected tripling in energy demand by 2030 while protecting the economically vital Mekong Delta from the impacts of upstream dams. 

Experts have produced volumes of peer-reviewed economic and environmental studies showing how much Cambodia and Vietnam will lose from reduced capture fisheries and sediment delivery to the delta as a result of dam building upstream.

These arguments have not yet influenced hydropower development policy. This point was brought home by the recent completion of the Lower Sesan 2 dam in Cambodia, which has blocked off the major Sesan and Srepok tributaries, potentially reducing Mekong-wide fish production by 9% according to a pre-eminent US scientific journal. 

Cambodia has the second highest electricity prices in ASEAN and so despite significant dependence on protein from Mekong fisheries, the government has implicitly prioritizedenergy security over food security. 

However, recent work by the Stimson Center, IUCN, the University of California-Berkeley, and The Nature Conservancy shows if Cambodia, Lao PDR, and Vietnam take advantage of recent advances in renewable power generation and transmission technologies, they can achieve energy security (defined as the uninterrupted availability of energy sources at an affordable price) at significantly lower social, environmental, and political risks. 

This is possible because the prices of solar and wind power have collapsed globally, making these renewable energies financially competitiveat the utility scale. Moreover, solar and wind plants can be built in less than a year compared to ten years for large dams, so they can be quickly deployed to relieve electricity supply shortages and accelerate rural electrification. 

Advances in transmission technology make completion of a regional grid a reality. According to the ADB, a regional energy gridwould allowthe Mekong countries to meet occasional peak demand and power reserve needs through energy trade instead of building excess capacity. 

Improved modeling capacity now allowsplanners to explore different dam development portfolios and compare their social and environmental impacts, supporting the identification and prioritization of dams that would meet power needs with fewer environmental impacts. 

Together, the integration of non-hydro renewables, regional power trading, and smart hydropower planning could reduce the number of dams that need to be built and improve the siting, design, and operation of the dams that will be built.

These advances have important implications for Lao PDR, which aspires to be the “Battery of Southeast Asia”. 

Because nearly all the dams built in Lao PDR are foreign-invested projects following the Build-Own-Operate-Transfer (BOOT) model, all revenues flow to the investor for the first 20-30 years of operation before ownership is handed over to the Lao government. 

As a result, these dams generate very little government revenue in the near term. A national grid, however, could generate US$400 million a year through wheeling charges, provided that it remains sovereign propertyof the government. 

Lao PDR also has substantial wind and solar potential (which peaks in dry season) thatcould balance hydropower (which peaks in wet season). So Lao PDR can indeed become a Battery of Southeast Asia, but onethat is more diversified and more resilient to market and climate shocks. 

Shifts in regional power demand also raise the question, which country is the key long-term market for Lao energy? Thailand has historically been the major investor in and purchaser of Lao hydropower, and has an agreement to purchase 10,000 MW in the future.

However, Thailand has recently introduced energy efficiency measures and plans to greatly increase investment in domestic renewables, which will likely reduce future demand for electricity imports from Lao PDR. 

Vietnam already has an MOU to buy 5,000 MW of electricity from Lao PDR by 2030, but it currently imports less than 1,000 MW. Despite the projected tripling of power, Vietnam’s Power Development Plan VII projections indicate that imported power will remain low. 

While counterintuitive, Vietnam can influence decisions over which dams are built upstream by substantially increasing its import of power from Lao PDR. 

Vietnamwill need to make a choice between importing either coal or electricity in order to meet rising demand from urbanization and industrialization.If Vietnam doubles its power purchase to 10,000 MW, it could add conditions as to what type of power it will purchase.

For instance, Vietnam could sign a conditional power purchase agreement to only buy power from dams with the lowestenvironmental impactson the Mekong Delta or from solar and wind power plants. This provides a market-based case for Lao PDR to deepen its investments in renewable energy.

Cambodia can speed up its transition to energy security through the large-scale deployment of solar power, which capitalizes on its high levels of sunshineand the fact that solar power peaks during the dry season when hydropower’s reliable electricity generation is vastly reduced.

Solar power will reduce the cost of meeting its energy needs: the construction cost per MW of a 10 MW solar plant in Bavet in SvayRieng Province is less than half that of the Lower Sesan 2 dam.

Regionally, there is growingprivate sector investment in large-scale renewables. In southern Lao PDR, Thailand is building a 600 MW wind farm and US investors have signed MOUs for hundreds of megawatts of solar plants. 

In Cambodia, private sector investment is expected to take off once the government issues a regulation for independent power producers, which is expected in January 2018. 

Private sector investment in renewables in Vietnam is currently limited by the low, subsidized cost of electricity and weak regulatory framework. 

While fair prices are offered to independent power producers, EVN, the state-owned utility, retains considerable discretion over whether projects get approved. But rising government debt and power demand are likely to accelerate the use of renewables. 

This could include the construction of solar and wind plants in Cambodia and Lao PDR, where land is relatively cheap, for export back to Vietnam. 

One of Cambodia’s 10,000-hectare Economic Land Concessions, for example, could generate an estimated 3,000 MW. That would open the door to large-scale deployment of solar for export to southern Vietnam.

While financing and technology are now readily available, the regulatory landscape is slow to adjust. For example, while it makes little economic sense, many government officials instinctively favor energy independence over power trading. 

And some interest groups have done very well from a project-by-project approach to hydropower development. But the economic case for fewer dams and more solar and wind power is overwhelming and if governments take advantage of these new opportunities, they can achieve energy security at far lower social and environmental cost.

By IUCN’s Jake Brunner, Stimson Center’s Brian Eyler and Courtney Weatherby, The Nature Conservancy’s Dr. Eloise Kendy, and UC Berkeley Energy and Resources Group’s Nikky Avila lead the Mekong Basin Connect Initiative.