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Data centre growth outpaces transmission build-out as ab $18b annual funding gap persists.

A structural mismatch between fast-deploying digital infrastructure and slow-moving grid upgrades is emerging in Southeast Asia, where transmission expansion can take up to 15 years versus one to five years for data centres and renewable projects, according to management consultancy firm Bain & Company.

The firm said this gap is being tested by about $200b in capital and more than 100 terawatt-hours of new electricity demand expected over the next three to four years, driven by data centres, electric vehicles, and industrial development.

Bain noted that grid constraints are increasingly influencing investment decisions as demand clusters in specific hubs that require faster transmission build-out.

It estimated the region needs about $29b annually in transmission and distribution investment by 2035 but spent around $11b in 2024, leaving a $18b yearly shortfall.

Data centre electricity demand is projected to grow 17% to 22% annually, reaching about 3.2% to 3.5% of regional consumption by 2030.

Malaysia was cited as the most advanced in grid readiness, whilst Thailand was described as having relatively higher reserve margins but tightening capacity.

Singapore was noted for high grid reliability but limited expansion capacity, whilst Indonesia, Vietnam, and the Philippines face longer connection timelines and reliability constraints.

Bain said behind-the-meter power solutions are unlikely to scale due to regulated utility structures, limited fuel access, and restrictions on direct power sales.

It proposed phased reforms including direct power purchase agreements, private participation in transmission assets, and longer-term ASEAN grid integration.