In 2022, a small but symbolically important flow of electricity began moving from a hydropower plant in Laos into Singapore, passing through Thailand and Malaysia along the way. It was widely described as the first multilateral power trade in ASEAN history, though the volume was limited to an initial tranche of up to 100 megawatts under the Lao PDR–Thailand–Malaysia–Singapore Power Integration Project. Every leg of the journey depended on separate bilateral agreements rather than a unified market framework. The milestone was real; it also underlined how far Southeast Asia remains from the integrated grid first proposed in regional policy documents in the late 1990s.
That gap is becoming harder to ignore. Southeast Asia’s electricity demand is growing faster than almost any other region, driven by industrialisation, urbanisation and rising household consumption. The region’s resource endowment is uneven: some countries hold large hydropower potential with limited domestic demand, while others run sophisticated economies with little domestic renewable resource. An integrated grid would connect those surpluses and deficits. Much of the physical infrastructure to support that vision remains unbuilt, and the institutional machinery to operate it remains largely undecided.
A Regional Mismatch Built for Interconnection
The ten ASEAN member states span a wide range of electricity system maturity, resource endowments and economic development. Singapore’s grid is widely regarded as one of the most reliable in the world, but the country has almost no domestic renewable resources. Laos has hydropower capacity well in excess of its own needs but limited transmission infrastructure to export it at scale. Indonesia is an archipelago of thousands of islands, many of which still depend on diesel generation. Myanmar has large gas and hydropower potential but a grid that has not expanded far beyond its major cities.
In principle, this diversity is well suited to interconnection. Hydropower from Laos and Myanmar could firm intermittent solar in Thailand. Vietnam’s growing wind capacity could supply demand centres in Cambodia. Singapore could purchase clean electricity from across the region instead of relying overwhelmingly on imported natural gas. The International Energy Agency and others have modelled scenarios in which regional interconnection materially reduces the total cost of decarbonisation compared with each country pursuing the transition in isolation. That broader resource pool underpins the economic and reliability case for connecting Southeast Asia.
The operating reality is close to the opposite. Despite decades of discussion, cross-border electricity trade in ASEAN remains small relative to more integrated markets. The European internal energy market moves electricity across borders routinely. The Southern African Power Pool has operated since the 1990s. Even Central America, with far fewer resources and lower investment capacity, operates a more interconnected regional system in practice. The gap reflects institutions and incentives rather than a lack of technical ambition.
What Has Actually Been Built
The ASEAN Power Grid is not entirely imaginary. The most visible achievement is the Lao PDR–Thailand–Malaysia–Singapore Power Integration Project, which began commercial operation in 2022 with a limited initial volume of hydropower from Laos flowing through Thailand and Malaysia to Singapore. The LTMS project is often described as ASEAN’s pathfinder for multilateral electricity trade, and the label is accurate in that it was the first to involve four countries. But it operates as a chain of bilateral agreements stitched together, not as a multilateral market. The volumes are small relative to Singapore’s total demand, and the arrangement relies on transmission infrastructure that was not originally designed for this purpose.
Other cross-border connections exist. Thailand and Malaysia operate a high-voltage direct current interconnection. Malaysia and Indonesia have links across the Strait of Malacca. Vietnam, Cambodia and Laos share transmission lines originally developed around specific hydropower projects rather than as part of a systematic grid integration strategy. The physical layer is uneven and often underused. A closer look at submarine cables and cross-border interconnectors in Southeast Asia shows how much of the existing capacity was built for bilateral trade rather than open regional exchange.
The flagship project’s operational detail matters: it moves power across three borders as a sequence of bilateral trades, each negotiated under a different set of rules and commercial terms. That structure works for a pilot but is unlikely to scale into a liquid regional market. It is one thing to string a wire; it is another to make it commercially usable in a multilateral sense.
Where the Bottlenecks Really Sit
The most visible explanation for slow progress is geography. Indonesia and the Philippines are archipelagos; submarine cables are expensive and technically demanding. On the mainland, distances between generation and demand can be substantial, and several national grids require upgrades before they can handle large cross-border flows. But focusing on hardware misses the deeper constraint.
The main bottlenecks are institutional. ASEAN’s model of consensus and non-interference has preserved political stability, but it is poorly suited to an integrated electricity market. The ASEAN Power Grid programme, run under the ASEAN Plan of Action for Energy Cooperation and informed by successive Interconnection Masterplan Studies, carries workstreams on grid codes, market rules and regulatory coordination, with the Heads of ASEAN Power Utilities and Authorities handling the technical side. The same physical connection can support limited bilateral exchanges under separate rules, but dependable operation across multiple borders has proved difficult where each side applies its own. Grid code harmonisation in ASEAN is therefore a practical precondition, even as bilateral arrangements continue to function.
Trust is the harder constraint. Importing countries must accept dependence on neighbours for electricity infrastructure, while exporters need confidence that their generation investments are less likely to be stranded by a policy change or a cheaper alternative. The barriers to cross-border power trading are often described as technical or economic, but the most durable ones are regulatory and political.
Market structure compounds the challenge. Several ASEAN countries still have vertically integrated state-owned utilities controlling generation, transmission and distribution. Opening grids to foreign generators threatens commercial positions and domestic policy control. Market liberalisation has proceeded unevenly: Singapore has a competitive wholesale market, Thailand has taken incremental steps while retaining strong central control, Vietnam has introduced competition in generation but not transmission or retail, and Laos remains dominated by a single state-owned utility. Building a multilateral market on this patchwork of incompatible commercial models is a far harder task than stringing transmission lines.
The Missing Institutional Layer
If there is one lesson from regions that have integrated their electricity systems, it is that physical interconnection must be matched by institutional integration. Transmission lines provide physical connection, but shared market rules are what allow that connection to be used efficiently. Without the rules, physical capacity tends to be underused.
ASEAN has not yet established the region-wide institutions required to operate a multilateral market. No region-wide ASEAN system operator has been created. No fully harmonised common grid code exists across all member states. A region-wide dispute resolution mechanism for cross-border electricity trade has not been set up. A fully harmonised framework for third-party access to transmission infrastructure remains at the discussion or partial-adoption stage. Each gap makes it harder for a generator in one country to sell to a buyer in another, even when a wire exists. Lessons from European market coupling show that the principal hard work lies in building shared market rules and governance, not merely stringing transmission lines.
Progress is being made, but slowly. The ASEAN Ministers on Energy Meeting has endorsed frameworks for multilateral electricity trading, and working groups are developing technical standards and regulatory guidelines. However, the distance between ministerial endorsement and operational reality remains wide. The European Union took decades to build its internal energy market, and it did so within a political union with supranational institutions and a common legal framework. ASEAN is attempting something similar without those advantages.
What Is Shifting the Calculus
Despite slow progress, several developments have begun to shift the cost-benefit calculation in favour of greater interconnection.
The first is the scale of investment required for domestic energy transitions. Most ASEAN countries have committed to net-zero targets and announced renewable energy goals. Meeting those goals requires large amounts of capital for generation, transmission and grid modernisation. Regional interconnection offers a way to share some of those costs by drawing on resources across borders, and the economic case has become harder to dismiss as the cost of going it alone becomes clearer.
The second is Singapore’s emergence as a large demand centre for imported clean electricity. Singapore has limited land for solar, no hydropower resources and a stated intention to reduce its reliance on natural gas. It has announced a target of importing up to 4 gigawatts of low-carbon electricity by 2035, and it has begun soliciting proposals from neighbouring countries. That demand signal—a wealthy city-state willing to pay for clean electricity—is already influencing investment decisions in Indonesia, Malaysia and beyond. It creates a commercial incentive that decades of regional planning documents could not.
The third is the growing role of China and multilateral development finance in regional infrastructure. China’s Belt and Road Initiative has financed hydropower projects, transmission lines and grid upgrades across mainland Southeast Asia. These investments have not been coordinated through ASEAN mechanisms, but they have created physical interconnection capacity that did not previously exist. The challenge now is to integrate those connections into a multilateral trading framework.
The fourth is the increasing value of grid flexibility. As more variable renewable generation comes online, the ability to balance supply and demand across a wider geographic area becomes more valuable. Interconnection reduces the cost of integrating renewables by allowing surplus generation in one location to meet demand in another instead of being curtailed. Thailand, Vietnam and the Philippines are already experiencing curtailment and grid congestion issues that wider regional coordination could partly relieve.
What to Watch
Several indicators sit at the centre of whether the ASEAN Power Grid moves from aspiration to operating reality.
The first is whether Singapore’s electricity import programme proceeds at scale and on schedule. If it does, it would establish commercial precedents and build confidence in cross-border trade. If it stalls, it reinforces the caution that has characterised the region’s approach for two decades. The second is whether ASEAN can develop operational institutions rather than produce more planning documents. A regional grid code, a framework for third-party access, and a mechanism for coordinating system operations across borders would each represent genuine progress. Several of these mechanisms remain at the proposal, pilot, or partial harmonisation stage rather than operating region-wide.
The third is the posture of the region’s major state-owned utilities. Many are vertically integrated monopolies with captive customer bases. Their cooperation is essential to any meaningful progress, yet their commercial interests and domestic mandates often pull against the regional objectives that cross-border trade would require.
The ASEAN Power Grid remains among the more consequential infrastructure ambitions in Southeast Asia that has not yet been built. The technical challenges are real; the political and institutional challenges are greater. The region’s ability to meet its energy and climate goals depends in part on whether those challenges are addressed. That, more than any single transmission line, reflects the current structural condition of the region’s electricity systems.
References
- International Energy Agency — World Energy Outlook 2025: regional electricity demand projections and interconnection cost analysis.
- Energy Market Authority of Singapore — Electricity Import Framework and the Lao PDR–Thailand–Malaysia–Singapore Power Integration Project: import volumes, target, and project status.
- ASEAN Centre for Energy — ASEAN Interconnection Masterplan Study: identification of priority cross-border transmission projects.
