Nuclear energy is central to India's net-zero commitment. Critically evaluate India's nuclear capacity expansion roadmap and associated bottlenecks.

Nuclear power offers round-the-clock, low-carbon baseload electricity, making it indispensable to India's Net Zero 2070 pledge [4]. The Nuclear Energy Mission's target of 100 GW by 2047 is therefore well-directed; the roadmap's credibility, however, rests less on its vision than on its execution capacity.

Strengths of the roadmap

• Phased, quantified targets: capacity is to rise from about 8.78 GW today to roughly 22 GW by 2031-32, then to about 54 GW through NPCIL's indigenous PHWRs and LWRs, with the balance 46 GW from central and state PSUs, State Governments, joint ventures and private players [2].
• Legal enablement: the SHANTI Act, 2025 (Presidential assent, 20 December 2025) permits private participation in plant operation, generation and equipment manufacture, while reserving enrichment, reprocessing and heavy-water production to the Centre [3].
• Two-pronged technology mix: 700 MWe PHWRs and large imported reactors at greenfield sites, alongside BSMR-200 and SMR-55 small modular reactors for brownfield sites [2], supported by ₹20,000 crore for SMRs in Budget 2025-26 [3].
• Demonstrated delivery: four reactors totalling 3,100 MW — KKNPP-2, KAPP-3&4 and RAPP-7 — were commissioned in the last decade [1].

Bottlenecks

• Scale mismatch: reaching 100 GW implies an over eleven-fold expansion, yet only nine reactors (7,500 MW) are presently under construction [1].
• Long gestation: large reactors have historically faced extended construction cycles and time overruns, straining interim milestones.
• Financing and liability: high capital intensity persists; SHANTI's graded liability framework, replacing the earlier single statutory cap, is investor-friendly but as yet untested in practice [5].
• Institutional capacity: nearly half the target depends on entrants without nuclear operating experience, alongside regulatory licensing bandwidth, fuel-supply assurance and land acquisition concerns.

The roadmap is thus directionally sound and now legally unlocked, but back-loaded and execution-sensitive. Front-loading SMR deployment, building independent regulatory capacity, and phasing private entry through NPCIL-anchored joint ventures would convert intent into installed capacity — making nuclear energy a dependable pillar of India's net-zero transition rather than an aspirational one.