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CommoditiesMedium•19 April 2026•

1 min read

India Achieves Criticality at Kalpakkam Fast Breeder Reactor After Long Delays

Industrial pipes and valves with blue and green flames, overlaid with a green line and bar chart, on an orange background.

Key Facts

1A new 500 MW sodium-cooled reactor in Kalpakkam, India, attained criticality in April 2026.

2Construction on the unit began in 2004 with an original expected completion date of 2010.

India has successfully achieved criticality at its new 500 MW sodium-cooled fast breeder reactor in Kalpakkam, marking a major milestone for the nation's nuclear sector. The achievement signifies the start of a controlled nuclear chain reaction, a critical step toward full operational capacity. Construction on this ambitious project originally began in 2004, facing nearly 16 years of delays beyond its initial 2010 completion target. This reactor is a cornerstone of India’s strategy to expand its nuclear energy footprint using advanced fast breeder technology. While the immediate market impact may be tempered by the project's long history, it remains a long-term bullish signal for uranium demand and energy independence. Investors are monitoring the NIFTY Energy Index and uranium-related instruments as India scales its carbon-free power generation.