The idea of a Southeast Asian electricity network has been discussed since the 1990s. It is finally acquiring construction schedules. The ASEAN Power Grid Advancement Programme is rolling out sub-regional pilot projects for multilateral power trade from 2026, building on existing bilateral arrangements, with the long-term ambition of linking all member states into a single integrated system by 2045.

The capital requirement is substantial: roughly US$27 billion for planned cross-border interconnections through to 2040.

The problem it is meant to solve

The International Energy Agency’s Southeast Asia Energy Outlook 2026 sets out the pressure. Under current policy settings, gas use in the region’s power sector rises by more than 60 per cent, while domestic supply falls by about a third by 2050. The arithmetic points in one direction: a steadily larger LNG import bill, purchased on international markets at prices the region does not set, by economies with ageing fields and limited domestic alternatives.

Regional interconnection is one of the few structural answers. It allows hydropower in the Mekong basin, geothermal in Indonesia and the Philippines, and solar across the archipelago to serve demand centres that cannot generate cheaply themselves.

Where the difficulty lies

The engineering is the easier part. The obstacles are commercial and regulatory.

Cross-border power purchase agreements need bankable terms across jurisdictions with different regulatory regimes, currencies and creditworthiness. Wheeling charges, what a country levies for electricity crossing its network, must be agreed in advance and remain predictable for the life of a project. Regulatory harmonisation across ten states with different market structures, some liberalised and some vertically integrated state monopolies, is slow work.

There is also a political dimension. Importing a material share of baseload electricity means accepting dependence on a neighbour, which is precisely what several member states have historically avoided.

Who this affects

Anyone siting energy-intensive facilities. Data centre operators have already discovered that grid capacity, not land, is the binding constraint in Singapore and increasingly in Johor. Manufacturers with decarbonisation commitments need renewable supply that their local grid cannot yet deliver. Both groups have a direct interest in whether cross-border renewable supply becomes contractable at scale, and on what terms.

Infrastructure investors and their advisers should watch the pilot projects closely, because the first multilateral transactions will establish the commercial templates everything after them follows.

Summary

The ASEAN Power Grid is moving into pilot deployment for multilateral power trade from 2026, requiring roughly US$27 billion of interconnection investment to 2040. The IEA warns that regional power-sector gas demand could rise more than 60 per cent while domestic supply falls by a third to 2050, making import dependence the central energy security question. Wheeling charges, cross-border PPA bankability and regulatory harmonisation will determine whether the grid delivers. Data centre operators, manufacturers with clean energy commitments and infrastructure investors should track the first pilot transactions.