3 old thermal power sites chosen for new nuclear power projects

Why in the News?

As of mid-2026, India is actively advancing its strategy to repurpose retiring coal-fired power plants into nuclear power stations.A high-level workshop hosted by the Central Electricity Authority (CEA) confirmed the identification of 3-4 sites for conversion to host nuclear units. This strategy is part of a larger plan to identify up to 10 retired thermal sites for conversion to help achieve 100 GWe of nuclear capacity by 2047. This represents a massive shift from 8.8 GWe to 100 GWe.

How does repurposing thermal power sites strengthen India’s nuclear expansion strategy?

1. Existing Land Availability: Facilitates faster project execution through pre-acquired industrial land. This reduces delays arising from land acquisition disputes. The evaluation framework prescribed a minimum land requirement of 340 hectares for nuclear facilities.
2. Water Infrastructure: Ensures access to cooling water infrastructure already available at thermal stations. Water availability emerged as a key criterion during site selection.
3. Grid Connectivity: Supports rapid integration into electricity transmission networks due to pre-existing evacuation infrastructure at thermal sites.
4. Ageing Coal Fleet: Addresses the challenge of thermal plants exceeding operational life. The panel specifically examined plants older than 40 years or nearing retirement.
5. Emission Reduction: Facilitates decarbonisation by replacing carbon-intensive coal power with low-emission baseload electricity.
6. Brownfield Development Model: Reduces costs and procedural bottlenecks compared to entirely new nuclear sites.

Why has nuclear power become central to India’s long-term energy transition?

1. Net-Zero Commitments: Supports India’s transition toward low-carbon electricity generation while maintaining energy security.
2. Baseload Electricity: Ensures stable electricity supply unlike intermittent renewable sources such as solar and wind.
3. Capacity Expansion Imperative: India plans expansion from 8.8 gigawatt-electric (GWe) to 100 GWe by 2047. This reflects a nearly 11-fold increase in nuclear generation capacity.
4. Growing Energy Demand: Supports rising electricity demand from urbanisation, industrialisation, electric mobility, and digital infrastructure.
5. Energy Diversification: Reduces overdependence on imported fossil fuels and volatile global energy markets.

What institutional and policy mechanisms are enabling this transition?

1. SHANTI Act, 2025: Expands private sector participation in nuclear operations and fuel-chain management while maintaining public-sector oversight over sensitive activities.
2. Inter-Agency Coordination: Strengthens institutional cooperation through involvement of the CEA, Atomic Energy Regulatory Board (AERB), and Nuclear Power Corporation of India Limited (NPCIL).
3. Site Selection Committee: Facilitates scientific evaluation through a subcommittee of the Standing Site Selection Committee, constituted in January 2025.
4. 17-Point Evaluation Checklist: Ensures technical scrutiny of:
   1. Accessibility
   2. Water availability
   3. Seismotectonic conditions
   4. Meteorology
   5. Population profile
   6. Surrounding settlements
5. Retrofitting Strategy: Supports reuse of retiring infrastructure rather than relying exclusively on greenfield nuclear projects.

Why are exclusion-zone norms emerging as a major obstacle?

An exclusion zone is a mandatory safety bubble around a nuclear plant where human habitation is legally prohibited to protect the public in an emergency. However, repurposing old coal plants into nuclear hubs is difficult because local communities have already built homes right up to these existing industrial borders.

1. Mandatory Exclusion Radius: Requires a minimum 1-km exclusion zone around reactor sites where habitation and economic activity remain prohibited.
2. Settlement Constraints: Creates implementation barriers as some shortlisted thermal sites have existing settlements nearby.
3. Population Challenge: One shortlisted site reportedly has 15-20 families living within the mandatory exclusion area, affecting project feasibility.
4. Conditional Viability: One project becomes feasible only if exclusion requirements reduce from 1 km to 700 metres.
5. Site Identification Constraint: Restricts availability of suitable inland nuclear locations despite existing industrial infrastructure.
6. Policy Proposal: Government is considering reducing exclusion-zone requirements for future nuclear plants.

Can Small Modular Reactors (SMRs) address India’s site constraints?

Small Modular Reactors (SMRs) are advanced, compact nuclear fission reactors that generate up to 300 MWe of electricity per unit, which is roughly one-third the output of a traditional large-scale nuclear plant. They are specifically designed to be built efficiently in factories and transported by truck, train, or ship to a designated site for quick assembly.

1. Compact Design: Requires smaller land parcels and lower cooling-water requirements.
2. Flexibility: Facilitates deployment at constrained industrial sites unsuitable for large conventional reactors.
3. Repurposing Potential: Strengthens prospects for converting old thermal power infrastructure into clean energy hubs.
4. Scalability: Supports phased capacity addition rather than large upfront investment.
5. Policy Relevance: Government assessments indicate some shortlisted thermal sites may eventually suit Small Modular Reactors (SMRs) better than conventional reactors.

What are the broader concerns associated with nuclear expansion in India?

While the transition to nuclear energy offers a clear path toward zero-carbon baseload power; scaling up capacity to 100 GWe introduces complex regional and systemic vulnerabilities. These concerns cross environmental, financial, regulatory, and public domains.

1. Environmental and Operational Constraints:
   1. Nuclear reactors require continuous, massive volumes of water for cooling. Deploying reactors at inland, retired coal plant sites risks acute water conflicts with local agriculture and urban centers, especially during peak summer droughts.
   2. Long-Term Waste Disposal: India’s expanding nuclear footprint will significantly increase the volume of high-level radioactive waste.
   3. Radiation and Disaster Risks: Despite advanced passive safety systems, concerns persist regarding:
      1. potential radiation leaks
      2. ecological contamination
      3. robustness of emergency evacuation protocols in highly populated surrounding areas
2. Economic and Regulatory Hurdles:
   1. High Capital Cost: Involves long gestation periods and substantial upfront investments.
   2. Regulatory Delays: Slows implementation due to multi-layered environmental and safety clearances.
3. Social and Public Friction:
   1. Deep-Rooted Public Resistance: Historical projects like Kudankulam and Jaitapur have faced years of intense local protests over forced displacement, loss of farming land, and perceived health risks.
   2. Exclusion-Zone Displacement: Forcing a 1-km or even a reduced 700-meter safety boundary inside established industrial brownfields means the government must legally evict existing families and ban surrounding economic activities.

Conclusion

Repurposing old thermal power plants for nuclear generation reflects a strategic convergence of energy transition, industrial asset reuse, and long-term electricity security. The initiative can accelerate nuclear expansion through brownfield infrastructure advantages. However, exclusion-zone regulations, water constraints, and regulatory bottlenecks remain critical implementation challenges. The success of this model may shape India’s ability to reconcile decarbonisation with rising energy demand.

PYQ Relevance

[UPSC 2017] Give an account of the growth and development of nuclear science and technology in India. What is the advantage of fast breeder reactor programme in India?

Linkage: The PYQ tests understanding of India’s nuclear energy ecosystem, indigenous nuclear programme, reactor technology, and long-term energy strategy. Evolving nuclear strategies such as repurposing retired thermal plants will help in India’s planned expansion of nuclear power from 8.8 GWe to 100 GWe by 2047