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India has taken a decisive step towards long-term energy self-sufficiency, with the Prototype Fast Breeder Reactor (PFBR) at Kalpakkam achieving first criticality on April 6, 2026\u2014a stage where a reactor sustains a controlled nuclear chain reaction. While this is a technical milestone, experts believe its implications are far more strategic, potentially reshaping India\u2019s energy future.<\/p>
Investment banker Sarthak Ahuja described the development as a turning point, stating, \u201cSomething big has happened in India\u2026 which puts India on the world map.\u201d His remarks underline that this is not just about commissioning another reactor, but about unlocking a long-term national capability.<\/p>
At the core of this achievement is India\u2019s vast natural advantage. As Ahuja pointed out, \u201cIndia has the world\u2019s largest reserves of thorium, almost 25% of the world\u2019s supply,\u201d positioning the country uniquely in the global energy landscape \u2014 much like China\u2019s dominance in rare earths. However, unlike uranium, thorium cannot directly power reactors, which is where the PFBR becomes critical.<\/p>
The Kalpakkam reactor is a key component of India\u2019s three-stage nuclear programme, conceptualised by Dr Homi Bhabha in the 1950s. Ahuja explained the roadmap: \u201cThe first step is using uranium\u2026 which generates plutonium. Then, as a second step, we use that plutonium to run a Fast Breeder Reactor.\u201d This second stage is precisely what the PFBR represents.<\/p>
What makes this technology transformative is its ability to generate more fuel than it consumes. As Ahuja noted, \u201cWhat an FBR does is that it generates more fuel than it consumes\u2026 reaching a cycle where you don\u2019t need any more fuel externally.\u201d In practical terms, this means India can significantly expand its limited uranium resources by converting them into plutonium, which can then be used to unlock thorium reserves.<\/p>