Southeast Asia will need $7.1tn in infrastructure investment through 2040 to sustain economic expansion, according to a report by the Asian Development Bank (ADB).
The report, titled The $7 Trillion Challenge: Building Tomorrow’s ASEAN, says the investment is also needed to enhance energy security and establish resilient regional links.
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It projects annual expenditure requirements of $476bn between 2026 and 2040, equivalent to 8.7% of the region’s gross domestic product.
Public spending at present meets 45% of this demand, which leaves an estimated annual funding shortfall of $264bn across member states.
Power and transport account for 85% of projected demand, at $3.6tn and $2.5tn respectively.
Energy needs centre on power generation, grid transmission and battery storage, as well as cross-border links through the Association of Southeast Asian Nations (ASEAN) Power Grid.
Complementing this, the ADB introduced its Pan-Asia Power Grid Initiative in May to expand regional electricity trade.
ADB president Masato Kanda said: “Southeast Asia’s growth depends on what it builds next. Its factories need dependable electricity, and its businesses need faster, safer ways to reach markets.
“These investments must also be built to deliver long-term benefits. ADB will help governments bring forward projects that investors can trust and people can depend on.”
In transport, road networks make up the largest single requirement at nearly $2tn, while rail systems and airports show the fastest growth rates to support integrated logistics corridors.
Digital infrastructure needs total $584bn, covering data centres and broadband deployment in line with the ASEAN Digital Economy Framework Agreement.
The funding targets align with the ADB’s Asia-Pacific Digital Highway initiative, which was established in May to finance regional data centres, submarine cables, internet exchange points and fibre-optic networks through 2035.
Healthcare infrastructure requires a further $227bn through 2040, covering roughly 49,000 new facilities, primarily primary healthcare centres.
The ADB identified a lack of bankable, well-prepared projects as the main structural barrier to securing private capital.
The report recommends regulatory harmonisation, transparent public procurement frameworks and strengthened project preparation to address constraints on state balance sheets.
The assessment covers all 11 ASEAN member nations.
Established in 1966, the Manila-headquartered ADB is owned by 69 member states, including 50 regional members.
