Who Is Actually Powering South East Asia's Buildings

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Corporate power purchase agreements across the Asia Pacific grew from 2.9 gigawatts of contracted capacity in 2020 to 9.7 gigawatts by 2023, more than a threefold increase in three years. Source: Power Purchase Agreement Statistics

Corporate power purchase agreements, on-site solar, and battery storage are moving from pilot projects to standard practice across the region's building sector. What has not caught up is uniformity. The regulatory landscape for buying clean power varies enormously from one South East Asian market to the next, and developers assuming a strategy that works in one country will transfer to the next are often wrong.

A Region Learning to Buy Clean Power Differently

For most of the past three decades, power procurement across South East Asia ran through a single channel: a state-owned utility signing long-term contracts with independent power producers, mostly for coal and gas. In Indonesia and Vietnam, the dominant operators remain vertically integrated monopoly state power companies, PLN and EVN, whose agreements carry an effective sovereign guarantee.

That structure delivered grid buildout at scale, but it left little room for a corporate buyer to simply choose a renewable supplier. The shift now underway, allowing companies to contract more directly with renewable generators, is a genuinely new development, and it is unfolding at different speeds in every market. Source: Southeast Asian Power Purchase Agreements Explained

Country by Country, Same Goal, Different Rules

Vietnam introduced its Direct Power Purchase Agreement mechanism through Government Decree 80/2024, offering both a direct wire model and a synthetic, contract-for-difference structure settled against Vietnam Wholesale Electricity Market prices. It remains a pilot framework rather than a fully open market, but Vietnam reached a genuine milestone in June 2026 when its first Direct PPA, tied to a 49 megawatt solar plant supplying Samsung, entered commercial operation, giving the region its first working example of the model. Source: Vietnam's First Direct Power Purchase Agreement Enters Operation

Thailand already permits private power purchase agreements under self-consumption models, particularly for rooftop solar, with oversight from the Energy Regulatory Commission. The country's Direct Power Purchase Agreement framework, initially approved as a 2 gigawatt pilot for data centres in 2024, has since moved toward a much broader clean-power market. In July 2026, the National Energy Policy Council approved the expansion of Direct PPA through Third Party Access beyond data centres to industrial users, alongside a separate electricity tariff category for data centres.

In August, the government removed the original 2 gigawatt cap on Direct PPA, opening direct renewable electricity purchases through the national grid to industries beyond data centres.

The shift comes as Thailand prepares for a major increase in electricity demand from digital infrastructure: the draft Power Development Plan 2026 incorporates estimated data-centre demand of approximately 6.8 to 8.8 gigawatts. The revised Direct PPA framework is now moving through the regulatory process, with the Energy Regulatory Commission conducting further consultation on the implementation rules. [Sources: Ministry of Energy; The Nation; Thailand Board of Investment.] [Sources: Dentons; The Nation; Thailand Board of Investment (BOI).]

Malaysia channels most corporate solar activity through net energy metering and behind-the-meter arrangements overseen by the Sustainable Energy Development Authority, while third-party wheeling, the ability to send power across the grid from an off-site generator to a specific buyer, remains restricted in most cases.

The Philippines has introduced its own Green Energy Option Program, giving commercial electricity users more flexibility to choose their supplier, a meaningful step in a historically utility-bound market. Singapore stands apart with a fully liberalised electricity market overseen by the Energy Market Authority, supporting both physical and virtual power purchase agreements, and behind-the-meter solar installations under 1 megawatt do not require a licence at all. Source: Power Purchase Agreement, Legal Guide to Infrastructure SEA

On-Site Solar and Storage Fill the Gaps

Where direct procurement routes remain limited or newly formed, on-site generation has become the practical default. Rooftop solar paired with battery storage lets a facility reduce grid dependence without waiting for a market to fully liberalise, and it works within almost every regulatory structure in the region, since the electricity is generated and consumed behind the same meter.

Thailand has moved furthest in removing the barriers to this approach. A Ministerial Regulation effective December 2024 removed rooftop solar from the legal definition of a factory altogether, eliminating the factory operating licence that installations above 1 megawatt previously required. A follow-on 2025 regulation extended the exemption from building-modification permits to all building types, a requirement that had previously applied in full only to residential systems under 160 square metres.

A further Ministerial Regulation (No. 72, B.E. 2568), published in the Royal Gazette on 19 November 2025, went a step beyond that extension: it removed the requirement for a structural integrity assessment certified by a licensed civil engineer and the requirement to notify local authorities before installation, for any building type where the panel load stays under 20 kilograms per square metre. In effect, most rooftop solar installations in Thailand are no longer treated as construction activity at all.

Developers and operators still need to file with the Energy Regulatory Commission and secure grid-connection approval from the Metropolitan or Provincial Electricity Authority, but the factory-licensing requirement for rooftop solar installations has been removed, regardless of system capacity, for projects outside industrial estates. Source: Hunton Andrews Kurth LLP, “Thailand Eases Regulations for Solar Rooftop Installations”

For factories located within IEAT industrial estates, however, additional requirements may still apply. For projects involving electricity generation and sale, the IEAT Land Use Permit (IEAT 01/2) and notification of business commencement remain relevant. For self-consumption projects, IEAT has indicated that these requirements may be exempted, subject to the applicable IEAT procedures. Source: Lexology

This is part of why on-site solar has moved fastest in markets like Vietnam and Thailand, where manufacturers and logistics operators have added rooftop systems directly at the facility level rather than waiting on grid-scale reform. Rooftop capacity in Thailand accounted for roughly 35 percent of total installed solar capacity by late 2023, and uptake has continued to accelerate since as licensing barriers have fallen. Source: A New Baseline for Thailand's Rooftop Solar Deployment

Why This Is Now a Disclosure Conversation

The energy procurement conversation and the ESG reporting conversation are converging quickly, because how a building was powered is no longer just an operational detail, it is an auditable disclosure line. Singapore requires all SGX-listed companies to report Scope 1 and Scope 2 greenhouse gas emissions from financial year 2025, with Scope 3 following for the largest constituents from 2026. Malaysia's Bursa exchange is phasing in ISSB-aligned climate disclosures for listed issuers from 2025. Source: ESG Reporting Frameworks in Southeast Asia

Thailand's Securities and Exchange Commission is restructuring the mandatory 56-1 One Report filing to include quantitative Scope 1, 2, and progressively Scope 3 emissions data alongside a formal assurance statement, with the transition running through 2030. Scope 2 emissions accounting rewards buyers who can demonstrate a verifiable link to renewable generation, not simply a stated intention to go green. A power purchase agreement, a set of renewable energy certificates, or a metered on-site solar system all produce the kind of auditable trail that assurance providers are now expected to test. A building's energy strategy has effectively become part of its parent company's disclosure infrastructure. Source: SEC Thailand Mandatory ESG Disclosure Timeline

What This Means for Developers and Operators

The practical implication is that energy procurement can no longer be treated as a single regional playbook. A strategy built around Vietnam's synthetic Direct Power Purchase Agreement structure will not transfer cleanly to Thailand's self-consumption rules or Singapore's fully liberalised market, and each requires its own legal and technical assessment before a term sheet is signed. For new developments, the design implication is just as direct: electrical infrastructure and roof loading need to anticipate solar and battery storage from the design stage, not as a retrofit once a tenant or investor asks for proof of renewable sourcing.

For Thailand specifically, the opportunity is opening on both the direct-procurement and on-site generation sides. In July 2026, Thailand approved measures to expand Direct PPA and Third Party Access beyond data centres, allowing other businesses to procure renewable electricity directly from generators through the grid. This marks a significant shift from the original data-centre-focused 2 gigawatt pilot and could broaden access to clean power for other large electricity users.

At the same time, the rapid expansion of data centres is prompting the government to address their wider resource requirements, including electricity and water consumption, with new rules and potential zoning measures under consideration. For developers, this means renewable energy procurement, grid capacity, water availability and infrastructure requirements increasingly need to be considered together from the earliest stages of project planning. Source: Thailand's Draft Regulation on Direct Power Purchase Agreements via Third Party Access

The market that is emerging rewards buildings, and the companies that occupy them, that can show their numbers, not just state their intentions.