Techno-Economic, Regulatory, and Policy Challenges of Nuclear and Renewable Deployment in India

India’s power demand is rising rapidly, putting pressure on policymakers to expand generation while accelerating decarbonisation. Solar and wind offer scale and speed but remain constrained by intermittency and storage requirements, while nuclear provides reliable low-carbon power but faces high costs, regulatory barriers and long construction timelines. The central challenge is how India can combine both to build a secure, affordable and low-carbon electricity system.

India’s rapid economic growth and the expansion of its industrial sector are creating unprecedented growth in power demand, which is set to double by 2035 (CEA, 2026). India, which was until now dependent on domestic coal to produce nearly 70% of its total electricity, now finds itself in a difficult policy dilemma where it must aggressively increase its power generation output to sustain its economic growth while simultaneously pursuing deep decarbonization of its power grid.

India has committed to reaching 500 GW of non-fossil energy capacity by 2030 and 100 GW of nuclear capacity by 2047 to meet its Paris Agreement climate commitments (World Nuclear Association, 2025). While solar photovoltaic (PV) and wind have scaled rapidly due to cost reductions achieved through competitive reverse auctions, the growth of nuclear power generation in India is lagging behind its targets. One of the key questions in the Indian energy policy debate is whether variable renewables integrated with battery energy storage systems (BESS) could totally substitute for thermal power generation in India or whether nuclear power will have a role in providing essential zero-carbon baseload power. This article assesses and compares nuclear power against utility-scale solar and wind in India in terms of levelized costs, capital expenditure, construction times, land intensity, and regulatory bottlenecks.

A Techno-economic Analysis Comparing Nuclear Power to Renewables

In order to determine whether nuclear or renewable energy sources would benefit India, analyses need to go beyond nameplate capacity and examine actual electricity generation as it varies with resource availability and consistency. The average Capacity Utilization Factor (CUF) of solar PV plants in India varies between 19–23%, while that for onshore wind ranges from 25–32% as both are subject to diurnal variations and monsoonal weather. By contrast, nuclear power plants (NPPs), which include Pressurised Heavy Water Reactors (PHWRs) and VVER (water-water energy reactor units) managed by the Nuclear Power Corporation of India Limited (NPCIL), regularly achieve CUFs of 80–85% or more. This means that to replace 1 GW of reliable nuclear generation, 3.5–4.5 GW of solar capacity coupled with grid-scale storage systems would be required to fill the gaps. An example of comparative techno-economic parameters between the two is illustrated below in the chart.

Levelized Cost of Electricity (LCOE) and System Integration Costs

The cost of electricity from utility-scale solar photovoltaic (PV) power in India has plummeted over the last decade, falling to as low as 0.028–0.031/kWh, as demonstrated by competitive bidding (IEA, 2024). Solar power also has lower upfront capital expenditures (CAPEX), averaging between 0.50–0.55 million/MW. However, headline Levelized Costs of Electricity (LCOE) present generation in isolation, as the system integration costs associated with its utilization on the grid are not included. As variable renewable penetration rises, managing grid stability requires investments in high-voltage transmission, automated demand response, Pumped Storage Hydro (PSH), and Battery Energy Storage Systems (BESS). When adding battery storage costs to provide firm, dispatchable power during evening peak hours, the true firmed LCOE of solar increases to 0.068–0.084 per kWh (IEEFA, 2025). Nuclear power exhibits high upfront CAPEX (2.10–3.00 million per MW for 700 MWe PHWRs) and higher initial generation tariffs (0.054–0.078 per kWh). Nevertheless, its dispatchable nature means it incurs minimal external system integration costs, offering predictable long-term marginal generation costs over operational lifespans exceeding 60 years.

Gestation Timelines and Land Constraints

The time taken to construct a utility-scale solar project varies from 12 to 18 months, allowing for rapid capital deployment. In contrast, greenfield nuclear projects in India are characterized by gestation times ranging from 8 to 14 years. This is attributed to multi-stage reviews required by the Atomic Energy Regulatory Board (AERB), land acquisition challenges, site development complexities, and long lead times in specialized manufacturing processes for heavy-forged components such as pressure vessels and steam generators. Nuclear power plants utilize less than 0.5 acres per megawatt, unlike land-intensive utility-scale solar power, which requires 4 to 5 acres/MW; both scenarios face challenges of land acquisition in densely populated agricultural areas and environmentally sensitive regions, respectively.

Structural, Regulatory, and Supply Chain Issues

Civil Liability Bottlenecks

The predominant legal hurdle for foreign and private involvement in India’s nuclear program is the Civil Liability for Nuclear Damage Act, 2010 (CLNDA). Under international principles of civil liability in nuclear activities, such as the Convention on Supplementary Compensation for Nuclear Damage (CSC), financial liability is assigned to the operator. However, Section 17(b) of India’s CLNDA allows for the recovery from suppliers of sums paid for loss, damage, or injury in the event of a nuclear incident being caused by a defect in goods. This liability structure has prevented major international and Indian technology vendors from signing their supplier contracts, leaving only the publicly owned NPCIL as the dominant reactor-builder in the country.

Statutory Monopolies and Capital Mobilisation

Under the Atomic Energy Act, 1962, private enterprises were prohibited from owning and operating nuclear power reactors. It is pertinent to note that the SHANTI Act 2025 has opened the sector to private participation. Government statements explicitly say that private entities can participate in building, owning, and operating nuclear power plants, subject to licensing and regulatory requirements. However, the Indian Government also says that the implementing rules are still being drafted. Therefore, as of now, private participation is legally enabled, but the implementation framework is still being established. Relying on central government budget allocations and loans to state-owned public sector enterprises (PSUs), India requires capital investment totalling an estimated 23 to 25 lakh crore ($275 to $300 billion) to meet its target of 100 GW of nuclear power by 2047 (TERI, 2026). This sum is beyond the capacity of the state balance sheet alone and would necessitate involvement from the private sector.

The Fuel Supply and the Three-stage Strategy

India possesses about 25% of the world’s thorium reserves, but has limited deposits of natural uranium (425,000–433,800 metric tons U₃O₈). Since domestic extraction (~600 metric tons U₃O₈/year) is insufficient to power an expanded fleet of reactors, India imports natural uranium under International Atomic Energy Agency (IAEA) safeguards. To achieve fuel self-sufficiency, India developed a long-term Three-Stage Nuclear Power Programme. Stage 1 deploys Pressurized Heavy Water Reactors (PHWRs), which run on natural uranium and produce plutonium-239 and electricity. Stage 2 focuses on Fast Breeder Reactors (FBRs), which utilize plutonium-239 and convert thorium into bred fuel, with the Prototype Fast Breeder Reactor (PFBR) reaching criticality at Kalpakkam. Stage 3 involves Advanced Heavy Water Reactors (AHWRs) that would eventually use the thorium-232/uranium-233 fuel cycle for ultimate long-term energy self-reliance. While Stage 1 is mature and Stage 2 is undergoing initial commercial testing, commercial scaling of Stage 3 thorium-based reactors requires further long-term materials engineering and fuel reprocessing development.

Strategic Policy Recommendations and Solutions

To develop a reliable and low-carbon grid that successfully balances variable renewable energy with a stable baseload power supply, India requires a series of legal, policy, and technological initiatives.

Scale Bharat Small Modular Reactors (BSMR-200)

Rather than focusing exclusively on gigawatt-scale conventional plants, India should prioritize the development and commercial deployment of Small Modular Reactors (SMRs). The indigenous 200 MWe Bharat Small Modular Reactor (BSMR-200), backed by dedicated budgetary support, offers significant strategic advantages. Firstly, factory production methods can help minimize the overall upfront capital expenditure and reduce construction timelines to three to four years. Secondly, it is possible to implement Small Modular Reactors (SMRs) on former coal-fired power plant sites, thereby benefiting from pre-existing infrastructure like high-voltage grid transmission lines, extensive cooling facilities, and readily available land. Thirdly, the integrated passive safety systems inherent in most SMR designs allow for smaller emergency planning zone requirements, which in turn expedites land acquisition around industrial areas.

Legislative and Statutory Modernization

The statutory requirements within the Atomic Energy Act, 1962, must be amended to facilitate joint venture (JV) arrangements between the Nuclear Power Corporation of India Limited (NPCIL) and leading private-sector industrialists. Such reforms to allow JV partnerships would open new avenues for financing private investment in nuclear power facilities. Simultaneously, Section 17(b) of the Civil Liability for Nuclear Damage Act must be adjusted in line with international treaties to limit supplier liability in the event of an accident, further stimulating participation in the global supply chain and among local suppliers.

Nuclear-Renewable Hybrid Energy Systems (N-RHES)

Instead of portraying nuclear energy and solar/wind energy as mutually exclusive energy sources for development, the Ministry of Power in India must instead consider and pilot Nuclear-Renewable Hybrid Energy Systems (N-RHES). This design allows for constant operation of the nuclear power reactor at its maximum thermal energy capacity, utilizing excess heat during periods of high peak solar irradiation for processes such as high-temperature steam electrolysis to generate green hydrogen or for thermal energy storage. During periods of high evening electricity demand, total output from nuclear power is rerouted to the grid, and electrical power generation is maintained without cycling the cores.

Green Financing Integration

To facilitate the infusion of international private capital, the Ministry of Finance (Government of India) should incorporate SMRs (Small Modular Reactors) and all nuclear infrastructure into India’s Sovereign Green Bond taxonomy. Appropriate blended public-private financing schemes and a sovereign-backed risk fund must be instituted and employed so as to minimize construction-loan IDC and further promote investment by institutional investors such as pension and infrastructure funds.

For the attainment of an entirely decarbonized electricity network, India requires an optimal mix. A portfolio comprising solely solar and wind energy sources leads to inevitable challenges in grid stability, land requirements, and the costs of energy storage over time. Conversely, widespread deployment of current nuclear power technologies faces obstacles such as limitations in capital availability, legal issues around civil liability, and long gestation periods. By implementing reforms to its laws, boosting collaboration between the public and private sectors, accelerating the deployment of Small Modular Reactors, and integrating the nuclear power sector with a renewable energy grid infrastructure, India will have the capacity to establish a low-carbon, cost-efficient, and safe power supply infrastructure.

Bibliography

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