On 26April, Prime Minister Narendra Modi addressed the nation with his monthly Mann ki Baat. Prime Minister hailed the achievement of criticality in the fast breeder nuclear reactor at Kalpakkam in Tamil Nadu as a “historic milestone in India’s nuclear energy journey”.
On April 6, 2026, India’s indigenously developed 500 MWe Prototype Fast Breeder Reactor (PFBR) at Kalpakkam, Tamil Nadu, attained its first criticality (a sustained nuclear chain reaction).
Wind energy generation capacity exceeding 56 gigawatts (GW). In the past one year, about 6 GW of new capacity had been added. India ranks fourth in the world in wind energy capacity.
India’s Three-Stage Nuclear Power Programme
The PFBR milestone marks India’s official entry into the Second Stage of its nuclear roadmap, envisioned by Dr. Homi J. Bhabha.
| Stage | Technology / Reactor | Fuel Used | Objective |
| Stage 1 | Pressurised Heavy Water Reactor (PHWR) | Natural Uranium | Generate electricity & produce Plutonium-239. |
| Stage 2 | Fast Breeder Reactor (FBR) | Plutonium-239 & Uranium | “Breed” more fuel than consumed; convert Thorium to Uranium-233. |
| Stage 3 | Thorium-Based Reactors | Thorium & Uranium-233 | Long-term energy security using India’s vast Thorium reserves. |
Wind Energy in India: Status & Growth
- Current Capacity: ~56.1 GW (added ~6 GW in FY 2025-26).
- Global Ranking: 4th (behind China, USA, and Germany).
- Leading States: Gujarat (highest capacity), followed by Tamil Nadu and Karnataka.
- Untapped Potential: India’s wind potential at 150m hub height is estimated at a massive 1,164 GW.
Challenges to Energy Expansion
- Nuclear: High capital costs, long gestation periods, and public concerns regarding safety and waste management.
- Wind: * Intermittency: Wind power is not available 24/7, requiring advanced battery storage.
- Land Acquisition: High-potential sites are often in remote or ecologically sensitive areas.
- Offshore Costs: While offshore wind (Tamil Nadu/Gujarat coasts) has huge potential, the initial installation costs are significantly higher than onshore.
Significance & Way Forward
- Energy Security: The PFBR reduces dependence on imported Uranium by utilizing a closed fuel cycle.
- Climate Commitments: These milestones are essential for India to reach its 500 GW non-fossil capacity target by 2030.
- Policy Push: The Nuclear Energy Mission (Budget 2025-26) aims for 100 GW of nuclear power by 2047.
- Green Energy Corridors: Strengthening the grid to handle the “surge” of renewable energy is the next critical step.
Practice Questions
For Prelims (PT)
Q. Consider the following statements regarding the Prototype Fast Breeder Reactor (PFBR) at Kalpakkam:
- It is the first commercial-scale reactor in the third stage of India’s nuclear programme.
- It is designed to produce more fissile material than it consumes.
- India is the only country in the world currently operating a commercial fast breeder reactor.
Which of the statements given above is/are correct?
A) 1 and 2 only
B) 2 only
C) 2 and 3 only
D) 1, 2, and 3
Answer: B) 2 only. Statement 1 is incorrect (it is the 2nd stage). Statement 3 is incorrect (Russia also operates them).
For Mains
Q. “The attainment of criticality by the PFBR and the steady growth of wind energy represent a dual-track approach to India’s energy transition.” Discuss how nuclear and renewable energy can complement each other in achieving India’s Net-Zero goals. (250 words)