Southeast Asia will add electricity demand equivalent to Japan’s entire current generation within the next decade, according to the International Energy Agency’s Southeast Asia Energy Outlook 2026, a scale of growth that reframes every grid, generation and supply chain decision in the region.

Electricity demand in the region is growing twice as fast as overall energy use, driven by industrialisation, data centres and cooling: the IEA projects residential air conditioner stocks will triple by 2035. Renewables capacity, 120 GW in 2024, nearly triples by 2035 under current policies and grows fivefold if announced targets are delivered. Auctions across the region awarded almost 19 GW of renewable capacity in 2025.

The financing picture is the tension in the report. Clean energy investment passed US$100 billion in 2025, up 60 percent on 2015, but the region’s fossil fuel import bill, over US$80 billion in 2024, is projected to reach US$245 billion by 2035 under current policies. Delivering pledges roughly halves that figure, which is the economic case for accelerating the build-out.

For suppliers and developers the message is straightforward: this is the fastest-growing large power market outside China and India, and its constraint set, grid investment, cross-border interconnection and offtaker credit, looks exactly like the one our readers already work with elsewhere. The IEA puts cross-border ASEAN grid needs at US$27 billion through 2040.

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Source

• IEA, Southeast Asia Energy Outlook 2026, executive summary

Reported by the EnergiTech Media newsroom from the source above. Last reviewed: August 2026.