Explained

Nuclear Hydrogen at Kalpakkam: A World First

India's Department of Atomic Energy has commissioned the world's first hydrogen production facility using nuclear heat, marking a breakthrough in clean energy technology at the Kalpakkam campus in Tamil Nadu.

April 15, 2026·The Breakdown Desk·5 min read

World's first nuclear-powered hydrogen production facility commissioned at Kalpakkam, Tamil Nadu
Uses copper-chlorine thermochemical cycle with heat from a fast breeder reactor at 900°C
Initial capacity of 5 kg/day, scalable to industrial levels in subsequent phases
Developed indigenously by IGCAR with support from the Department of Atomic Energy
Could provide a pathway to low-carbon hydrogen without relying on intermittent renewable energy
Supports India's National Green Hydrogen Mission target of 5 MMT annual production by 2030

Quick Facts

Location

IGCAR, Kalpakkam, Tamil Nadu

Source: DAE

Technology

Cu-Cl Thermochemical Cycle

Source: IGCAR

Heat Source

Fast Breeder Reactor (900°C)

Source: DAE

Capacity

5 kg/day (Phase 1)

Source: DAE

Year of Commissioning

2026

Source: DAE Press Release

Global Rank

First of its kind worldwide

Source: IAEA

Global Comparison

🇮🇳

India

Nuclear H₂ Pilot (operational)

5 kg/day

🇺🇸

USA

Nuclear H₂ R&D (under development)

Pilot stage

🇯🇵

Japan

HTGR hydrogen research

R&D phase

🇫🇷

France

Nuclear H₂ feasibility studies

Conceptual

What's Next

Q3 2026

Scale-up to 50 kg/day demonstration plant

High probability

2027

Integration with sodium-cooled fast reactor for continuous operation

Medium probability

2028–2030

Commercial-scale plant of 10+ tonnes/day at new nuclear site

Medium probability

2030

National Green Hydrogen Mission target of 5 MMT/year

On track probability

Nuclear Hydrogen at Kalpakkam: A World First

Executive Summary

Quick Facts

Global Comparison

What's Next

Nuclear Hydrogen at Kalpakkam: A World First

Executive Summary

Quick Facts

Global Comparison

What's Next