India’s Nuclear Energy Expansion And Structural Reforms

Context

The article analyses India’s plan to expand nuclear power capacity to 100 GW by 2047, supported by the SHANTI Act, 2025, and examines associated policy, technological, and energy-transition challenges.
Source: Transforming India’s nuclear power landscape, The Hindu, April 6, 2026

Legislative Transformation: SHANTI Act, 2025

Structural Shift: Ends monopoly of Department of Atomic Energy (DAE) by enabling private sector participation in nuclear power
Institutional Reform: Provides statutory backing to Atomic Energy Regulatory Board (AERB)
Legal Replacement: Repeals Atomic Energy Act, 1962 and Civil Liability for Nuclear Damage Act, 2010
Investment Facilitation: Revises liability framework to attract domestic and foreign capital
Implementation Need: Requires detailed subordinate rules for effective execution

Drivers of Nuclear Expansion

Developmental Imperative: Achieving “Viksit Bharat” by 2047 demands significant increase in electricity generation
Energy Transition: Shift from fossil fuel-based energy use to electricity across sectors
Net Zero Target: Requires expansion of low-carbon baseload power
Consumption Gap: India’s per capita electricity generation (1,418 kWh) far below global averages
Structural Constraint: Only one-fifth of total energy consumption is electricity

Limitations of Renewable Energy Expansion

Capacity-Generation Mismatch: Renewables form ~50% of capacity but contribute ~22% of generation
Intermittency: Output depends on time, season, and geography
Baseload Requirement: Continuous supply still dependent on thermal and nuclear sources
Storage Dependency: Large-scale storage investments needed for renewables expansion
Market Challenges: 40 GW renewable capacity stalled due to lack of power-purchase agreements

Current Energy Profile and Role of Nuclear Power

Installed Capacity: 476 GW total (June 2025), with 8.8 GW nuclear
Generation Share: Nuclear contributes ~3% of electricity generation
Thermal Dominance: Provides ~75% of electricity despite ~50% capacity share
Low-Carbon Baseload: Nuclear offers stable, continuous power unlike intermittent renewables

India’s Nuclear Power Evolution and Capacity Constraints

Historical Beginning: First nuclear reactor commissioned at Tarapur in 1969
Existing Fleet: 24 reactors operated by NPCIL with ~8,780 MW capacity
Reactor Mix: BWR (Tarapur), VVER (Kudankulam), PHWR (majority)
Indigenous Development: PHWR scaled from 220 MW to 540 MW and 700 MW
Cost Advantage: 700 MW PHWR costs ~$2 million per MW (globally competitive)
Investment Requirement: ~$200 billion needed to add ~90 GW capacity

Challenges in Scaling Nuclear Power

Implementation Delays: 10 PHWR reactors approved in 2017 yet to begin construction
High Cost Imports: Foreign reactor designs (EDF, Westinghouse, GE-Hitachi) exceed $5 million per MW
Financing Issues: High upfront capital costs require innovative financial models
Regulatory Gaps: Need clarity on tariffs, fuel ownership, waste management, liability, and dispute resolution

Small Modular Reactors (SMRs) and Industrial Integration

R&D Investment: ₹20,000 crore allocated for indigenous SMR development
Capacity Targets: 5 MW, 55 MW, and 200 MW SMR designs by 2033
Industrial Demand: Interest from steel, cement, petrochemicals, paper, and data centres
PHWR Potential: 220 MW model suitable for modularisation and captive applications
Efficiency Gains: Construction timelines can be reduced to ~40 months

Three-Front Strategy for Nuclear Expansion

Indigenisation: Adapt foreign reactor designs to reduce costs and build domestic ecosystem
Research Focus: Develop SMRs, molten-salt reactors, and advanced nuclear technologies
Captive Nuclear Deployment: Replace fossil-fuel-based captive plants with modular nuclear units

Thorium and Technological Alternatives

Resource Base: India has significant thorium reserves
Alternative Pathway: Thorium cladding with HALEU as substitute to breeder reactor route
Strategic Potential: Enables early utilisation of domestic thorium resources

Regulatory and Governance Challenges

Civilian vs Strategic Separation: Need clarity between defence-related and civilian nuclear activities
Policy Framework: Transparent rules required on tariffs, fuel ownership, waste disposal, and liability
Regulatory Autonomy: Ensuring independence of nuclear regulator
Outcome Dependence: Effectiveness of SHANTI Act hinges on clarity and transparency in implementation

Nuclear Power Generation in India

Current Status and Targets

Installed Capacity: Approximately 8.8 GW as of early 2026, indicating a relatively small but strategically important share in India’s energy mix.
Record Generation: Achieved an all-time high of 56.6 billion units (MUs) in FY 2024–25, reflecting improved plant performance and utilisation.
Long-term Target: Government aims to scale nuclear capacity to 100 GW by 2047, aligning with energy security and clean energy goals.

Recent Milestones

Kakrapar-4 Commissioning: Indigenously designed 700 MW PHWR began commercial operations in February 2024, showcasing domestic technological capability.
Rajasthan-7 Grid Connection: A 700 MW unit connected to the grid in March 2025, contributing to incremental capacity expansion.
PFBR Criticality Achievement: Prototype Fast Breeder Reactor (Kalpakkam) achieved first criticality on April 6, 2026, marking a crucial step in India’s long-term nuclear programme.

SHANTI Act, 2025

Legislative Overhaul: Repeals and replaces the Atomic Energy Act, 1962 and Civil Liability for Nuclear Damage Act, 2010, restructuring the nuclear governance framework.
Private Sector Entry: Allows licensed private Indian companies and joint ventures to build and operate nuclear plants for the first time.
Liability Reform: Introduces a tiered liability structure (₹100 crore to ₹3,000 crore based on reactor capacity) and removes automatic supplier liability for defective equipment, addressing investor concerns.

Atomic Energy Regulatory Board (AERB)

Statutory Recognition: Granted formal statutory status under the SHANTI Act, making it an independent regulator accountable to Parliament.
Leadership Update: Shri A.K. Balasubrahmanian assumed charge as Chairman on January 1, 2026.
Enhanced Powers: Empowered with explicit authority for inspection, search, and seizure across both public and private nuclear installations.

Nuclear Power Corporation of India Limited (NPCIL)

Evolving Role: Continues as the primary public sector entity and technical supervisor despite loss of monopoly in plant operation.
Fleet Mode Implementation: Executing ten 700 MW PHWRs simultaneously to achieve economies of scale and cost reduction.
Joint Venture Initiative: Formed ASHVINI (JV with NTPC) for the 4×700 MW Mahi Banswara nuclear project in Rajasthan.

HALEU (High-Assay Low-Enriched Uranium)

Definition: Uranium enriched between 5% and 20% U-235, higher than conventional reactor fuel (<5%).
Technological Importance: Essential for advanced reactors and SMRs, enabling smaller cores and longer fuel cycles.
Indian Policy Context: SHANTI Act enables private participation in nuclear fuel fabrication, including enrichment up to threshold levels, opening possibilities for domestic HALEU production.

Small Modular Reactors (SMRs)

Mission Launch: Nuclear Energy Mission (Union Budget 2025–26) allocated ₹20,000 crore specifically for SMR development.
5 MW HTGR Design: High-Temperature Gas-Cooled Reactor aimed at hydrogen production and industrial applications.
55 MW SMR-55: Designed for decentralised electricity generation and remote area deployment.
200 MW BSMR-200: Indigenous Bharat Small Modular Reactor planned for repurposing retired coal-based power plant sites.

Reactor Types in India

PHWR (Pressurised Heavy Water Reactor): Backbone of India’s nuclear programme; uses natural uranium and heavy water moderator/coolant (e.g., Kakrapar units).
BWR (Boiling Water Reactor): Older generation technology used at Tarapur Units 1 & 2; Unit 1 re-synchronised with grid in February 2026 after refurbishment.
VVER (Pressurised Water Reactor): Russian-designed reactors; Units 1 & 2 operational at Kudankulam, Units 3–6 under construction.

Thorium Utilisation and Three-Stage Programme

Resource Base: India possesses about 21% of global thorium reserves, mainly in monazite sands.
Stage II Transition: With PFBR criticality in 2026, India enters Stage II, using plutonium from Stage I to breed Uranium-233 from thorium.
Stage III Vision: Focuses on thorium-based fuel cycles in Advanced Heavy Water Reactors (AHWR) to achieve long-term energy independence.

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