What Are Small Modular Reactors (SMRs)?

Small Modular Reactors (SMRs) are a type of advanced nuclear reactor designed to be smaller and more flexible than traditional large-scale nuclear power plants. According to the International Atomic Energy Agency (IAEA), SMRs typically have a power capacity of up to 300 megawatts electrical (MWe) per unit, which is roughly one-third the output of conventional reactors having the power capacities of 1000 MWe.

They are built using modular components that can be prefabricated in factories, transported to sites, and assembled on location, potentially reducing construction time and costs compared to traditional reactors. SMRs can vary in size from as small as tens of megawatts to hundreds, making them suitable for applications like electricity generation, industrial process heat, desalination, or even powering remote areas.

Key Advantages

1. Enhanced safety features such as passive cooling systems that don't rely on external power 
2. Lower upfront capital costs due to scalability
3. Smaller physical footprint i.e. it occupies less physical space.
4. Unlike large reactors, SMRs can be deployed in clusters to match demand, and they produce less nuclear waste while maintaining high efficiency.

How SMRs Could Transform India's Energy Sector

India's energy sector is heavily reliant on coal (about 70% of electricity generation), with growing demands from industrialization, urbanization, and data centers. The country aims for net-zero emissions by 2070 and a significant increase in non-fossil fuel capacity. SMRs offer a pathway to decarbonize while ensuring reliable baseload power. Here's how they could drive change:

1. Decarbonization and Transition from Coal

• SMRs can replace aging coal plants, providing clean, 24/7 baseload energy without intermittency issues seen in renewables like solar or wind. India plans to deploy SMRs at existing coal sites to minimize grid disruptions during the shift.
• With lower emissions and smaller exclusion zones (e.g., 0.5–2.5 km vs. 30 km for older reactors), SMRs enable safer integration near populated or industrial areas.
• The government envisions 40+ such reactors for heavy industries, accelerating the phase-out of coal while supporting net-zero goals.

2. Energy Security and Scalability

• SMRs enhance energy independence by leveraging India's thorium reserves and domestic uranium, reducing reliance on imported fossil fuels. Their modular design allows for quick deployment (potentially in 3–5 years vs. 10+ for large reactors) and scaling based on demand.
• Ideal for remote or grid-isolated regions, they can power off-grid industries, mining, or rural electrification, addressing India's uneven energy access.
• For emerging sectors like data centers, SMRs provide reliable, high-density power—crucial as India expands its digital infrastructure.

3. Economic and Cost Benefits

• Factory assembly could lower costs through standardization, making nuclear more affordable than large projects. India's existing reactors are already among the world's lowest-cost to operate, and BSRs (e.g., 220 MW units) aim to further optimize this.
• The Union Budget 2025-26 allocated funds for a Nuclear Energy Mission (Rs 200 billion) focused on SMR R&D, with 16 potential sites across six states.
• Private sector involvement (e.g., Reliance, Adani, Tata Power) via public-private partnerships could speed commercialization, with NPCIL overseeing operations. This could attract investments and create jobs in manufacturing and engineering.

Overall, SMRs could position India as a nuclear innovator, boosting clean energy share from 40% to over 50% by 2030, enhancing resilience against climate change, and fostering industrial growth.