# Is Thailand's 600 MWe SMR Ambition Finally Getting Traction?

Six US reactor developers are now in contention for Thailand's first nuclear deployment, after the US Trade and Development Agency (USTDA) signed an agreement with the Electricity Generating Authority of Thailand (EGAT) on 14 September 2026 to fund a vendor-neutral feasibility study targeting approximately 600 MWe of SMR capacity. The agreement was signed in Bangkok by USTDA Deputy Director and Acting Director Thomas Hardy and EGAT Governor Narin Phoawanich.

The study will assess potential deployment locations, cost structures, and the regulatory pathway Thailand would need to navigate to bring SMRs online. Reactor designs under consideration include those from [GE Vernova / GE Hitachi Nuclear Energy](https://smrintel.com/companies/ge-vernova), [Holtec International](https://smrintel.com/companies/holtec-international), [Kairos Power](https://smrintel.com/companies/kairos-power), [NuScale Power](https://smrintel.com/companies/nuscale-power), [TerraPower](https://smrintel.com/companies/terrapower), [Westinghouse Electric Company](https://smrintel.com/companies/westinghouse), and [X-energy](https://smrintel.com/companies/x-energy). USTDA will issue a request for proposals for the study from US firms — consistent with the agency's standard model of funding studies executed by American companies.

Thailand has no operating commercial nuclear plants. Its only nuclear facility is a research reactor operational since 1977. SMR deployment is, however, embedded in the Thai government's long-term power development strategy, making this feasibility study a meaningful — if early — step toward first concrete action.

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## What the USTDA Agreement Actually Covers

The USTDA-EGAT agreement is a feasibility study grant, not a construction commitment or a vendor selection. That distinction matters. USTDA's standard mechanism is to fund early-stage assessments that, by design, favor eventual US-technology adoption — the agency's mandate is explicitly export promotion. The study will produce site assessments, cost modeling, and a regulatory roadmap tailored to Thailand's existing legal framework, which currently has no nuclear power licensing infrastructure.

The vendor-neutral framing covers seven distinct US design approaches spanning a wide range of reactor types: [GE Vernova / GE Hitachi's](https://smrintel.com/companies/ge-vernova) BWRX-300 (a boiling water derivative), Holtec's SMR-300, Kairos Power's fluoride salt-cooled high-temperature design, NuScale's VOYGR platform, TerraPower's Natrium sodium fast reactor, Westinghouse's AP300, and X-energy's Xe-100 pebble bed HTGR. These span thermal and fast spectra, different coolant chemistries, and very different fuel supply chain requirements — including potential [High-Assay Low-Enriched Uranium](https://smrintel.com/glossary/haleu) dependencies for some designs. A genuinely rigorous study will need to model those fuel supply chain differences explicitly for a country with zero domestic enrichment infrastructure.

The 600 MWe target figure is the headline anchor for the study's scope. Whether that is met by a single unit, multiple smaller units on one site, or a distributed deployment across sites is precisely what the study is intended to determine.

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## The Competitive Backdrop: Korea Is Already in the Room

The USTDA agreement does not give US vendors a clear field. In June 2025, [Korea Hydro & Nuclear Power](https://smrintel.com/companies/khnp) signed a memorandum of understanding with EGAT covering SMR cooperation, technical information exchange, and personnel training. KHNP is advancing its own SMR design — the SMR-160 — and has demonstrated willingness to offer integrated project support to Southeast Asian markets. South Korean nuclear export strategy has historically bundled financing, construction, and long-term operational support in ways that pure US vendor arrangements have struggled to match.

USTDA's approach — funding a study that by policy uses US firms — is a deliberate counter to that dynamic, designed to embed US technology preferences at the feasibility stage before procurement decisions crystallize. The February 2026 USTDA commitment of USD 2.7 million for a comparable Philippine SMR study (with Meralco PowerGen Corp) signals a consistent Indo-Pacific playbook: use study grants to establish US technology as the reference point before Korean or other competitors lock in relationships.

Whether that playbook succeeds in Thailand depends on what the study produces. If it identifies a credible regulatory pathway and cost range that a Thai government decision-maker can defend politically, it materially advances the US vendor position. If it produces a document that sits on a shelf — as many such feasibility studies do — KHNP's existing MOU relationship may prove more durable.

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## Thailand's Nuclear Starting Position

Thailand's nuclear ambitions have a history of false starts. Various feasibility initiatives over the decades have not translated into construction commitments, partly due to public acceptance challenges and partly due to the absence of a domestic nuclear regulatory framework capable of licensing a commercial power plant. A country deploying its [first of a kind (FOAK)](https://smrintel.com/glossary/foak) nuclear plant faces compounded regulatory complexity: it must build the regulatory institution simultaneously with evaluating the technology.

The USTDA study's mandate explicitly includes mapping the "regulatory steps needed to move forward," which suggests the agency recognizes this as a primary constraint rather than a downstream problem. That is analytically correct — Thailand would need to establish or significantly expand a nuclear regulatory body, pass enabling legislation, and potentially negotiate a 123 Agreement with the United States before any US-designed reactor could be deployed. None of those steps are fast.

EGAT Governor Phoawanich's public statement framed the study as a foundation for evaluating SMR's role in Thailand's energy security — measured language that stops well short of a deployment commitment. That framing is appropriate given how early-stage this engagement remains.

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## Industry Implications

For US SMR developers, the EGAT agreement adds Thailand to a growing list of Southeast Asian markets where USTDA is actively laying groundwork. The vendor-neutral structure means no single company wins from this announcement — but all seven named developers gain visibility in a government feasibility process that will eventually narrow the field.

For the broader Indo-Pacific SMR market, the pattern of paired USTDA feasibility grants — Philippines in February 2026, Thailand in September 2026 — indicates a systematic US government effort to establish commercial nuclear footholds in the region before Chinese or Russian state-backed offerings (Rosatom has been active across Southeast Asia) or Korean integrated packages dominate procurement decisions.

The 600 MWe scale is notable. That is not a single micro-reactor pilot — it is a meaningful baseload commitment that would require multi-unit deployment for most SMR designs in the study's scope, or a larger single-unit design like the Holtec SMR-300 or Westinghouse AP300. The final study design recommendations will reveal whether EGAT is genuinely oriented toward distributed SMR deployment or simply used the 600 MWe aggregate figure as a planning placeholder.

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## Key Takeaways

- **USTDA and EGAT signed a feasibility study agreement on 14 September 2026** in Bangkok, covering SMR deployment targeting approximately 600 MWe.
- **Seven US reactor developers** are included in the vendor-neutral study scope: GE-Hitachi, Holtec, Kairos Power, NuScale, TerraPower, Westinghouse, and X-energy.
- **The study will address site selection, cost modeling, and Thailand's regulatory pathway** — the last of which is a significant undertaking given Thailand has no commercial nuclear licensing framework.
- **KHNP signed an SMR MOU with EGAT in June 2025**, meaning US vendors enter a market where South Korean competition is already established at the relationship level.
- **USTDA used the same playbook in the Philippines** in February 2026, committing USD 2.7 million for a comparable SMR study with Meralco PowerGen — suggesting a coordinated Indo-Pacific nuclear export strategy.
- **Thailand has operated a research reactor since 1977** but has no commercial nuclear plants and no history of nuclear power regulation.

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## Frequently Asked Questions

**What is the USTDA-EGAT SMR feasibility study?**
The US Trade and Development Agency has agreed to fund a vendor-neutral feasibility study for the Electricity Generating Authority of Thailand. The study will assess potential sites, costs, and regulatory requirements for deploying approximately 600 MWe of SMR capacity in Thailand, drawing on designs from seven US reactor developers.

**Which US SMR companies are included in the Thailand study?**
The study covers designs from GE-Hitachi, Holtec, Kairos Power, NuScale, TerraPower, Westinghouse, and X-energy. The vendor-neutral structure means no company is pre-selected; the study is intended to identify which designs best suit Thailand's grid, site, and regulatory conditions.

**Does Thailand have any existing nuclear infrastructure?**
Thailand has operated a research reactor since 1977 but has no commercial nuclear power plants and no regulatory framework for licensing them. Establishing that framework is one of the key tasks the USTDA feasibility study is expected to address.

**How does this relate to Korea's SMR engagement with Thailand?**
Korea Hydro & Nuclear Power signed an MOU with EGAT in June 2025 covering SMR cooperation and feasibility exploration. US vendors therefore enter a market where Korean engagement is already active. The USTDA study is partly designed to establish US technology as the analytical reference point before procurement decisions are made.

**What happens after the feasibility study is complete?**
The study produces recommendations on sites, costs, and regulatory steps. It does not obligate Thailand to build anything. A positive study outcome would typically be followed by more detailed pre-project development work, regulatory institution-building, and eventually a formal procurement process — a timeline likely measured in years, not months.