India’s nuclear power generation relies on a strategic Three-Stage Nuclear Power Program designed to maximize domestic energy independence by transitioning from natural uranium to fast breeder reactors, and ultimately to thorium-based fuel cycles.
Indigenous Pressurized Heavy Water Reactors (PHWRs)
India’s flagship domestic reactors evolved from Canadian Deuterium-Uranium (CANDU) technology into standardized Pressurized Heavy Water Reactors (PHWRs). The IPHWR-700 (producing 700 MWe) represents India’s standardized modern capacity. Commercial operations include Kakrapar Units 3 and 4 (Gujarat) and Rawatbhata Unit 7 (Rajasthan). These domestic commercial reactors are operated by the state-owned Nuclear Power Corporation of India Limited (NPCIL).
Indigenous PHWRs utilize Indian-produced heavy water alongside domestic natural uranium and imported uranium fuel supplied via international bilateral agreements. India markets its 220 MWe and 700 MWe PHWR platforms to countries seeking moderate-grid capacity.
Foreign Reactor Projects & Large Nuclear Parks
Foreign technology deployments focus on high-capacity light water reactors (LWRs) operating on enriched uranium:
- Russia (Rosatom / VVER-1000): The most active foreign partner. Kudankulam Units 1 and 2 are in commercial operation, with Units 3 through 6 under construction in Tamil Nadu.
France (EDF / EPR): Proposed deployment of six European Pressurized Reactors (EPRs, 1650 MWe each) at Jaitapur, Maharashtra, with technical and commercial negotiations managed by EDF (formerly Areva).
United States (Westinghouse / AP1000): Proposed installation of six AP1000 reactors (1100 MWe each) at Kovvada, Andhra Pradesh.
Small Modular Reactors (SMRs) & Private Sector Policy
To supply clean, baseload power to heavy industries and off-grid locations, India has modernized its SMR strategy:
Bharat Small Reactor (BSR): India is re-engineering its proven 220 MWe PHWR architecture into dedicated Small Modular Reactors for captive industrial applications (e.g., steel, chemical manufacturing, and hydrogen production).
Private Sector Integration: Policy reforms permit private industrial enterprises to co-invest in and operate SMR capacity under joint venture frameworks with state entities.
Fast Breeder Reactors and Thorium
Fast Breeder Reactors (Stage 2): State-run BHAVINI reached a historic milestone at Kalpakkam (Tamil Nadu) when its 500 MWe Prototype Fast Breeder Reactor (PFBR) achieved initial criticality in April of 2026, following the initiation of fuel core loading in March 2024.
Thorium (Stage 3): India has massive reserves of thorium sands on its beaches, but running a commercial thorium grid is still a long-term goal. It requires a critical mass of fuel generated from Stage 2 fast breeder reactors first.
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Last updated: July 31st, 2026
