Southeast Asia energy shift hinges on grids & links

TBH has published a report on Southeast Asia's energy transition, arguing that transmission, storage and cross-border links will shape the region's next phase of power investment.

The study examines Malaysia, Thailand, Indonesia, Vietnam, the Philippines and Singapore, and argues that new generating capacity alone will not meet rising electricity demand. Governments and investors need to plan generation, transmission, storage and interconnection together as industrial growth, urbanisation and data centre expansion put more pressure on energy systems.

Electricity demand is rising across the region as manufacturers expand and digital infrastructure consumes more power. The report says this is shifting attention from the volume of electricity produced to the ability of grids to move it, store it and keep supply stable when renewable output changes quickly.

That marks a shift for a region where much of the recent debate has centred on adding generation. According to TBH, the next stage of the transition will depend heavily on whether countries can modernise networks, add storage and coordinate projects that often span different regulatory systems and funding models.

Ali Nami, Director and Energy Lead, TBH, said investment priorities across the region are shifting.

"Southeast Asia's energy transition is entering a new phase. Many countries are making significant investments in generation capacity, but the focus is increasingly shifting towards transmission, storage and connectivity. The ability to coordinate these investments and translate them into reliable outcomes will play a major role in shaping the region's long-term energy future," said Ali Nami, Director and Energy Lead, TBH.

Regional pressures

The report outlines different pressures across the six markets. In Malaysia, it points to growing data centre investment in Johor and Greater Kuala Lumpur as a source of added strain on grid reliability and planning.

Thailand is expanding solar and other renewable sources, including floating solar, while trying to balance industrial demand with affordability and energy security. Indonesia faces a different challenge: delivering generation, transmission and storage projects across a vast island network.

Vietnam's rapid industrial growth is testing transmission networks and overall grid capacity. In the Philippines, the focus is on resilience and network modernisation, while offshore wind is identified as a longer-term prospect.

Singapore stands apart because of its limited domestic renewable resources and rising demand from digital infrastructure. The report says the city-state is positioning itself as a regional hub for lower-carbon electricity imports, finance and cross-border energy links, giving it a central role in broader discussions on transmission and power trading.

Michael Tan, Country Manager - Malaysia, TBH, said these national trends reflect a broader regional rise in demand.

"Electricity demand is increasing rapidly across the region, driven by industrial growth and the expansion of digital infrastructure. Ensuring energy systems can support that growth will require careful planning, coordinated investment and a long-term view of future demand," said Michael Tan, Country Manager - Malaysia, TBH.

Grid stability

A core argument in the study is that adding more solar and wind generation increases the importance of grid stability. As renewable output varies with weather conditions, power systems need to balance supply and demand more carefully and respond to sharper swings in generation.

Storage is presented as a central part of that response. The report says it is needed not only to support renewable energy, but also to manage peak demand, improve reliability and keep electricity flowing steadily as networks become more complex.

This increases the importance of transmission upgrades and grid modernisation alongside new generation projects. It also means delays in one part of the system can affect wider programmes, especially where projects are linked across national borders or rely on separate sources of finance and approvals.

Cross-border links

The study also examines the case for deeper regional integration through cross-border electricity trade. It points to the ASEAN Power Grid concept and the ASEAN Plan of Action for Energy Cooperation as signs of growing interest in linking markets more closely.

Greater interconnection could allow countries to share power more efficiently, improve resilience and strengthen energy security, particularly where national energy mixes and demand patterns differ. The report identifies Singapore and Malaysia as likely early movers because of their infrastructure networks and existing regional roles, while Indonesia's scale and proximity to Singapore make it increasingly important in broader discussions on electricity flows.

TBH argues that these projects bring financing, regulatory and coordination challenges that cannot be addressed separately. Transmission, storage, grid upgrades and interconnection are described as interdependent investments, with delivery emerging as a strategic issue in its own right.

Some of the biggest risks lie where major projects intersect with different funding streams, approval systems and stakeholders, and where setbacks in one area can delay progress elsewhere in the network, the consultancy says.

The report concludes that Southeast Asia's energy transition will be defined not only by how much is invested, but by whether countries can turn complex infrastructure plans into functioning systems across borders and technologies.