A Historic Leap in India's Nuclear Energy Journey: PFBR at Kalpakkam Achieves Criticality
India has achieved a major milestone in its pursuit of clean and self-reliant energy. The Prototype Fast Breeder Reactor (PFBR), located at Kalpakkam in Tamil Nadu, successfully attained criticality on April 6, 2026. This achievement not only symbolizes a technical triumph but also marks a decisive step toward India's long-term energy vision.
With a capacity of 500 megawatts, this reactor has been developed by the Bharatiya Nabhikiya Vidyut Nigam Limited (BHAVINI). Attaining criticality signifies that a controlled and self-sustaining nuclear chain reaction has now commenced within the reactor, thereby paving the way for future electricity generation.
A Historic Entry into the Three-Stage Program
With this achievement, India has officially entered the second stage of its three-stage nuclear energy program. This visionary plan was conceptualized by the eminent scientist Dr. Homi Jehangir Bhabha.
- Stage 1: Natural Uranium-based Reactors
- Stage 2: Fast Breeder Reactors (such as the PFBR)
- Stage 3: Thorium-based Energy Generation
Given that India possesses limited uranium reserves but abundant thorium reserves, this model steers the nation toward long-term energy self-reliance.
What are the Key Features of the PFBR?
The PFBR stands apart from conventional reactors. It generates more fuel than it consumes. It utilizes a mixed oxide (MOX) fuel comprising uranium and plutonium.
- Enhanced Fuel Production (Breeding Capability)
- Closed Fuel Cycle (Fuel Recycling)
- A Foundation for a Thorium-based Future
This technology positions India as the second nation in the world—following Russia—to operate a commercial Fast Breeder Reactor.
A Step Toward Clean Energy and Net-Zero Goals
This achievement reinforces India's commitment to clean energy. It represents a significant stride toward the goal of achieving net-zero emissions by 2070, as announced by the Prime Minister. Nuclear Energy:
- Constitutes 24×7 available base-load energy
- Generates low carbon emissions
- Is essential for industrial and technological development
Future Plans
The Government of India has set a target of achieving 100 GW of nuclear energy capacity by 2047. To this end:
- Small Modular Reactors (SMRs) are being developed
- An investment of ₹20,000 crore has been allocated
- BARC is working on new technologies
