## Is India's Private Nuclear Sector Choosing PHWRs Over SMRs?

India's newly liberalised private nuclear sector is converging on the country's indigenous **700 MWe Pressurised Heavy Water Reactor (PHWR)** design as its entry point — not SMRs — and the reason is brutally pragmatic: the supply chain is already 90–95% domestically sourced, the design has regulatory approval, and operational precedent exists across multiple plants. That assessment comes directly from Vivek Sharma, Business Head of Adani Atomic Energy, speaking at a recent industry event in Delhi.

The preference does not mean India is abandoning its SMR ambitions. The Nuclear Energy Mission, announced in the Union Budget 2025-26, targets 100 GWe of nuclear capacity by 2047 and calls for at least five indigenous SMRs to be developed and operational by 2033. But for private-sector firms taking their first steps under the newly enacted SHANTI Act, 2025 — which opened nuclear power generation to private participation — PHWRs represent the lowest-risk entry path. SMRs, by contrast, remain early-stage on both the regulatory and supply-chain fronts in India.

The companies now positioning in this space include Adani Atomic Energy, Jindal Steel, Reliance Industries, Tata Power, Hindalco Industries, and JSW Energy. NTPC, the public-sector giant, has set a 30 GW nuclear target by 2047, with its project director stating that PHWRs and PWRs will account for roughly 80% of that capacity.

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## The 700 MWe PHWR Advantage: Supply Chain Is the Deciding Factor

The PHWR argument is essentially a [first-of-a-kind (FOAK)](https://smrintel.com/glossary/foak) risk-reduction argument. India has been building and operating PHWRs for decades through the Nuclear Power Corporation of India Ltd (NPCIL). The 700 MWe design is standardised, has regulatory clearance, and — critically — is nearly fully localised.

Sharma's 90–95% indigenisation figure is significant. For any private company entering nuclear for the first time, supply chain localisation directly affects both [levelized cost of energy](https://smrintel.com/glossary/lcoe) and schedule certainty. Importing major reactor components carries foreign exchange risk, customs complexity, and the practical difficulty of vendor qualification under India's nuclear liability framework.

Naveen Ahlawat, President and Head of Sustainability and Decarbonisation at Jindal Steel Limited, echoed the same logic — the established industrial ecosystem around the 700 MWe PHWR makes it the natural starting point for a company that is, effectively, a nuclear newcomer regardless of its industrial scale in steel.

The contrast with international reactor technologies is stark. Sharma was explicit: SMRs and [boiling water reactors](https://smrintel.com/glossary/bwr) would require substantial localisation in India before becoming commercially viable. That localisation takes time, vendor qualification, and regulatory engagement that the PHWR pathway has already completed.

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## NTPC's 30 GW Target and the Technology Mix

NTPC's approach is the clearest public articulation of how India's establishment players see the technology sequencing. K. Shanmugha Sundaram, NTPC's Projects Director, placed PHWRs at the base of the stack, with PWRs — already operating at Kudankulam — as the secondary tranche, and SMRs in a holding pattern.

"Currently, the only available technology in India is PHWR. Naturally, that is the cheapest form of nuclear power available right now. Then we have PWRs, which are already there in Kudankulam. Then we have SMRs, for which it is too early to say," Sundaram said at the Delhi panel.

NTPC's joint venture with NPCIL — Anushakti Vidhyut Nigam Ltd (ASHVINI) — is already advancing on the 4×700 MW Mahi Banswara Rajasthan Atomic Power Project in Rajasthan. That project, built on PHWR technology, represents exactly the model private entrants are likely to study before committing capital.

The 80% PHWR/PWR share of NTPC's 30 GW nuclear portfolio implies a residual slice — potentially several gigawatts — where SMRs or other advanced designs could eventually fit. But "eventually" is doing real work in that sentence.

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## What the SHANTI Act Changes — and Doesn't Change

The SHANTI Act, 2025 is the legal architecture enabling private-sector nuclear participation, but it does not eliminate the technical and regulatory hurdles that make SMRs a harder first bet. Private companies still operate under India's nuclear liability regime, still need regulatory clearance from the Atomic Energy Regulatory Board (AERB), and still need to build or contract the operational expertise to run a nuclear facility.

The PHWR pathway simplifies that problem considerably. Regulatory precedent is established. NPCIL can serve as a technical partner or knowledge transfer source. Vendors are known quantities. For a Jindal Steel or an Adani entering nuclear primarily to secure reliable [baseload power](https://smrintel.com/glossary/baseload) for energy-intensive operations, this matters enormously.

SMRs introduce compounding unknowns: which design, which vendor, which regulatory pathway, what fuel type, and — for designs requiring [High-Assay Low-Enriched Uranium](https://smrintel.com/glossary/haleu) — what domestic enrichment infrastructure exists to support them. India currently has no civilian HALEU production capability, which effectively rules out several international SMR designs without a fuel import dependency that undermines the indigenisation rationale entirely.

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## Skeptical Analysis: Is 100 GWe by 2047 Credible Either Way?

India's 100 GWe nuclear target deserves scrutiny regardless of which reactor design carries it. The country's current installed nuclear capacity is a fraction of that figure, and PHWRs — while proven — are not fast to build. The Mahi Banswara project, though advancing, is still years from first concrete. NTPC's 30 GW contribution alone would require an industrial build-out that India has never attempted at this pace.

The five-SMR-by-2033 goal faces a different problem: India's indigenous SMR designs are still in development. Meeting that timeline while simultaneously standing up private PHWR projects and expanding NPCIL's own construction programme implies a level of simultaneous parallelism in design, regulatory review, manufacturing, and construction that the industry has not demonstrated.

The PHWR preference from private players is rational. Whether it translates into operational capacity at the scale the Nuclear Energy Mission envisions is a separate, harder question — one that depends on financing structures, grid integration, regulatory throughput at AERB, and whether the domestic PHWR supply chain can scale from supporting NPCIL projects to absorbing private-sector demand simultaneously.

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## Key Takeaways

- **India's private nuclear entrants** — including Adani Atomic Energy and Jindal Steel — are prioritising the **700 MWe indigenous PHWR** as their entry reactor, not SMRs.
- The PHWR supply chain is **90–95% domestically sourced** according to Adani Atomic Energy's business head, making it the lowest-risk commercial entry point.
- The **SHANTI Act, 2025** opened private participation in nuclear; the **Nuclear Energy Mission** targets 100 GWe by 2047 and five indigenous SMRs by 2033.
- **NTPC** targets 30 GW of nuclear by 2047, with PHWRs and PWRs accounting for roughly 80% of that capacity.
- **SMRs are sequenced later** — not abandoned — pending supply chain localisation and regulatory pathway development.
- Firms that have shown nuclear interest include Adani, Jindal Steel, Reliance Industries, Tata Power, Hindalco Industries, and JSW Energy.
- India's lack of domestic **HALEU** production infrastructure constrains several international SMR designs from being viable near-term options.

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## Frequently Asked Questions

**Why are Indian private companies choosing PHWRs over SMRs?**
India's indigenous 700 MWe PHWR design is fully approved, operationally proven, and supported by a domestic supply chain that is 90–95% locally sourced. SMRs lack equivalent regulatory clearance and supply chain infrastructure in India, making them a higher-risk entry point for companies new to nuclear operations.

**What is the SHANTI Act 2025?**
The SHANTI Act, 2025 is India's legislation enabling private-sector participation in nuclear power generation and other peaceful nuclear activities, subject to regulatory oversight. It provides the legal framework under which companies like Adani Atomic Energy and Jindal Steel are pursuing nuclear projects.

**What is India's nuclear capacity target by 2047?**
The Nuclear Energy Mission, announced in the Union Budget 2025-26, targets 100 GWe of installed nuclear capacity by 2047. It also calls for at least five indigenous SMRs to be developed and operational by 2033.

**Which private companies are entering India's nuclear sector?**
Companies that have expressed interest include Adani Atomic Energy, Jindal Steel, Reliance Industries, Tata Power, Hindalco Industries, and JSW Energy, following the passage of the SHANTI Act.

**Will India still develop SMRs if private players prefer PHWRs?**
Yes. The government's Nuclear Energy Mission explicitly targets five indigenous SMRs by 2033. The private-sector preference for PHWRs reflects a sequenced approach — PHWRs first to build operational experience, with SMRs and foreign technologies considered in a subsequent phase as the sector matures.