Asia Digital Infrastructure: ADB Flags $584 Billion Infrastructure Investment Challenge by 2040

Timor-Leste launched its first international submarine fibre-optic cable in July 2026. World Bank data showed just 1% household fixed-broadband penetration in 2025, the lowest among 11 ASEAN economies. Internet subscriptions covered 46.1% of residents, while the government contracted to connect 450 villages.

Laos recorded 66% internet use in 2024. Cambodia has 34,500 kilometres of fibre networks, but high-speed access remains unreliable outside major cities.

Indonesia’s satellite programme connected 27,805 public-service locations by mid-2025, with fewer than 12% in Papua and Maluku. The Philippines secured $287 million to expand broadband access to underserved communities.

The Asian Development Bank estimates Southeast Asia needs $584 billion for digital infrastructure through 2040. Its November 10 assessment identifies inadequate project preparation and financing constraints as obstacles to private investment.

Private capital is already entering established markets. In May, Equinix announced plans to invest over $190 million in a Malaysian data centre, while countries with weaker broadband coverage continue seeking funding for network expansion.

Southeast Asian Countries Face Uneven Digital Infrastructure Investment Gaps

Timor-Leste reported 80% 4G coverage in 2025 and plans 1,500 kilometres of terrestrial fibre linking municipal offices. Construction was scheduled to begin in 2026, with no budget disclosed. Australia provided A$7.2 million for advisory work on its international submarine cable.

Laos recorded 2.72 fixed-broadband subscriptions per 100 people in 2023, against Cambodia’s 4.15 in 2024. Lao Telecom invested $17.78 million in network infrastructure in 2025. Cambodia’s cellcard signed a $300 million proposed network-upgrade agreement with Huawei in September 2026, without a funding timetable.

Telkom Indonesia spent Rp24.58 trillion on infrastructure in 2025, with Rp14.55 trillion in outstanding contractual capital commitments at year-end. Its subsidiary launched the Pukpuk submarine cable connecting Papua and Papua New Guinea in May 2026.

In the Philippines, PLDT, Globe Telecom and Converge ICT proposed a $500 million domestic submarine cable, pending approval. Two failed bidding rounds left Phases 4 and 5 of the National Fiber Backbone without construction contracts as of June 2026.

ADB Identifies $584 Billion Digital Infrastructure Investment Requirements

Broadband networks and data centres account for $584 billion of Southeast Asia’s projected infrastructure requirements through 2040, according to the Asian Development Bank’s November 10 report, The $7 Trillion Challenge: Building Tomorrow’s ASEAN. Its announcement did not provide separate estimates for either category.

The region’s total infrastructure requirement reaches $7.1 trillion, averaging $476 billion annually from 2026 to 2040. Government investment at current levels would cover 45%, leaving an estimated $264 billion yearly financing gap across electricity, transport, healthcare and digital infrastructure. A separate shortfall for the digital sector was not reported.

ADB President Masato Kanda identified limited investment-ready projects and fragmented financing arrangements as obstacles to attracting private capital.

In August, he outlined plans to help governments prepare projects and coordinate funding across borders. The institution also recommends clearer procurement procedures and more predictable regulations. 

The Asia-Pacific Digital Highway targets $20 billion in financing by 2035, including $15 billion from the bank and $5 billion in expected co-financing.

Its plans cover terrestrial and submarine fibre, satellite connections and regional data centres. A separate $1 million technical-assistance approval supports digital corridor preparation in countries including Indonesia, Thailand, the Philippines and Vietnam. The larger programme covers Asia and the Pacific, with funding yet to be fully mobilised. 

Private Investors Expand Southeast Asia’s Broadband and Data Centre Markets

Digital Edge announced a $4.5 billion, 500-megawatt data-centre project in Bekasi, Indonesia, in January 2026. Its first building is scheduled to open in December, with two more in 2027. The developer secured a $665 million green loan in March, but financing for the entire campus remains undisclosed.

Indonesia’s Linknet secured up to $350 million in March for fibre expansion into smaller cities, including $200 million from the International Finance Corporation (IFC) and $150 million mobilised from the Asian Development Bank (ADB). IFC estimated national fixed-broadband penetration at 23%, against a regional average of 52%.

Malaysia had 689 megawatts of operational data-centre capacity and another 1,951 megawatts planned in mid-2025, according to the World Bank. ST Telemedia Global Data Centres secured financing of up to $1.37 billion for its Johor campus in August 2026.

Princeton Digital Group obtained a $1.3 billion loan from six banks in November to support further expansion in Malaysia. Equinix expects its Kuala Lumpur KL2 facility to open in 2027.

Thailand’s B.Grimm Power and its partner secured an $880 million green loan in May for a 100-megawatt data centre in Chonburi, with initial completion planned for late 2026.

Southeast Asia Digital Infrastructure Investment Faces Power and Financing Constraints

More than 110 data-centre applicants in Thailand have requested over 30,000 megawatts of electricity, although government officials estimated on November 10 that only a quarter were genuine investors. Malaysia requires operators to submit 10-year demand forecasts and sign electricity supply agreements before receiving grid access.

In Indonesia, a Bekasi data-centre campus secured two 725-MVA power feeds from PLN ahead of its planned late-2026 opening. Thailand’s new screening rules apply to applications submitted after August 14, with 40 previously approved projects still under development as of November.

In the Philippines, two unsuccessful bidding rounds left the National Fiber Backbone’s fourth and fifth phases without construction contracts as of June 2026. ADB’s digital corridor preparation programme runs until April 2030, with country-level construction allocations under its wider financing initiative still undisclosed.