BANGKOK, 3 AUG 2026 — In June we reported that ASEAN's data-centre boom was running into a wall of power and water, with Johor already turning projects away. Thailand has now written that wall into its investment rules. Since 30 March, a developer applying for investment privileges for a new data centre must arrive with a letter from the energy regulator confirming the electricity actually exists.
The requirement is short and it moves the burden. Applicants to the Board of Investment must obtain written confirmation from the Office of the Energy Regulatory Commission "confirming that the electricity supply will be sufficiently available", and file it with the application itself. The BOI's stated purpose is to ensure promotion of data-centre projects "is aligned with the readiness of Thailand's electricity infrastructure, and to support investors in making informed investment decisions".
Until this year the sequence ran the other way. A project won its privileges on the strength of capital committed and jobs promised, and the question of whether the grid could carry it was settled afterwards, in negotiation with the utility. Thailand has moved that question to the front of the queue.
Four tests, and only one of them is about money
Applicants are now screened on four grounds: a reliable power supply with a clean-energy roadmap; sustainable water management that does not harm local access; pollution and noise controls; and some contribution to the domestic economy, whether through talent development, local supplier integration, research capacity sited in Thailand, or shared computing capacity.
Narit Therdsteerasukdi, the BOI's secretary-general, put the last of those plainly: "Investors must create concrete benefits for Thailand, whether developing personnel or establishing excellence centers."
A separate BOI notification published in the Royal Gazette on 5 June updated the conditions attached to high-energy-efficiency data centres, and on 19 June the government restated the position — Thailand remains open to digital investment, but energy, water and community impact have to be managed. The framing officials have used is a shift from quantity to quality, which is the sort of phrase that survives a press conference without committing anyone to anything. The ERC letter is what makes it operative.
The part that is a price
Two other measures, both denominated in money, matter more to a developer's model than any of the qualitative tests.
The first is a bank guarantee of 4.5 million baht per megawatt of reserved capacity. This is a charge for holding a place in the queue, aimed at developers who reserve far more headroom than a project will use — capacity the grid then cannot offer to anyone else.
The second is still a proposal rather than a rule, and it is the one to watch. Thailand is considering a dedicated data-centre electricity tariff of 5 to 6 baht per kilowatt-hour against a standard rate of 3.95. That is a premium of between a quarter and a half, applied to the single largest operating cost of the business.
| Before | Now | |
|---|---|---|
| When grid capacity is checked | After approval, with the utility | Before approval, in writing, from the ERC |
| Cost of reserving capacity | None stated | ฿4.5m bank guarantee per MW |
| Electricity price | Standard ฿3.95/kWh | ฿5–6/kWh proposed for data centres |
| Water and noise | Not a screening ground | Screened |
| Local economic contribution | Capital and jobs | Talent, SME integration, R&D, shared compute |
RECATOOLS summary of the BOI changes as reported to 3 August 2026. The tariff row is a proposal under consideration, not an adopted rate — it is included because it is the largest number in the table, not because it is settled.
The clean-energy test has a mechanism, and most projects cannot reach it
The requirement to show a roadmap for adopting clean energy is not rhetorical. Thailand has spent the past year building the instrument that would make such a roadmap credible: a direct power purchase agreement scheme, letting a data centre buy renewable electricity from a private generator across the national grid instead of taking whatever mix the utility supplies.
The Energy Regulatory Commission released the draft regulation on 3 October 2025. The pilot is capped at 2,000 megawatts and is reported to have taken effect in January under the government's "Quick Big Win" policy, though the operating detail was still being settled as of July — so what has been approved and what is final are not yet the same thing.
The eligibility list is where the policy meets the market. To qualify, a data centre must already hold BOI promotion and have earned no income from the project. It must also commit to 100 per cent renewable energy, submit a ten-year electricity plan, hold a backup supply contract with the state utility, and carry a minimum IT base load of 50 megawatts per building.
That last threshold does most of the work. Fifty megawatts of IT load per building is hyperscale, and it excludes essentially every colocation hall and regional operator in the country. The two policies therefore point in different directions for anyone below the line. The BOI now tests every applicant on its clean-energy roadmap; the route to buying clean energy directly is open only to the largest. A smaller developer is asked to produce the plan and denied the instrument that would deliver it.
What the approval numbers show, and what they do not
The BOI approved 26 data-centre projects worth 498.716 billion baht in 2025 — about US$15 billion. So far in 2026 it has approved eight, worth 162.044 billion baht, or about US$4.9 billion. Sixteen projects have had their electricity supply confirmed.
The drop might look like the gate working, but that reading is premature for two reasons. The 2026 figure covers roughly seven months against a full prior year, so the comparison is not like for like; and approval counts are lumpy in any case, since a single hyperscale campus can carry more capital than a dozen smaller halls. On a monthly rate the slowdown is real but considerably less dramatic than 26 against 8 makes it look.
The useful conclusion is narrower: Thailand is no longer competing purely on how fast it can say yes, and it has published the terms on which it will now say no. Market forecasts still assume the sector grows quickly — one projection has it compounding at 27.71 per cent a year to 2031, taking the market from 470 billion baht to 2.02 trillion. Those are forecasts, made by people selling forecasts, and they were made before the gate.
The regional read
Thailand is the second ASEAN jurisdiction this year to constrain data-centre capital, and its approach differs instructively from the first. Johor turned projects away on power and water availability as an administrative fact. Thailand has done it as published policy, with a form to fill in, a guarantee to post and a price attached.
That difference is what makes it portable. An administrative bottleneck is something an investor tries to route around or wait out. A tariff and a bank guarantee are line items — they can be modelled, priced and compared against Malaysia, Vietnam or Indonesia, and they will be. The region has spent two years competing to attract this capital on speed and incentives. Thailand has just made the first serious move in the other direction, and the question it poses to its neighbours is the one American regulators have been arguing over all year: who pays for the grid the boom is consuming.
Nothing here settles that. Thailand has not said data centres must fund their own generation, and the tariff is not adopted. What it has done is stop treating electricity as a detail to be resolved after the ribbon is cut.
