PIB TrackerA gigawatt of nuclear avoids 5.4 million tonnes of CO2
The companion backgrounder prices nuclear against the other clean sources per unit of installed capacity, and sets out the waste, dose and emergency architecture that comes with it.
What happened
- In FY 2025-26 one gigawatt of nuclear capacity avoided about 5.4 million tonnes of CO₂ equivalent.
- The comparison given is 2.7 million tonnes for hydropower, 1.6 million for wind and 0.9 million for solar.
- Since 1969 the programme has cumulatively avoided 851 million tonnes of CO₂ equivalent.
- India opened the first hydrogen facility using nuclear process heat at Kalpakkam in 2026, and a Boron-11 enrichment facility at Talcher.
- The AERB limits public dose to 1 mSv a year and occupational dose to an average 20 mSv a year over five years.
For Prelims
- Carbon comparison: per GW of installed capacity in FY 2025-26 — nuclear 5.4 Mt, hydro 2.7 Mt, wind 1.6 Mt, solar 0.9 Mt of CO₂e avoided.
- Cumulative: 851 million tonnes of CO₂e avoided since Tarapur began operating in 1969.
- Dose limits: AERB sets 20 mSv a year averaged over five years for workers, a 100 mSv cumulative ceiling and 30 mSv in any one year, and 1 mSv a year for the public.
- Waste rules: the Atomic Energy (Safe Disposal of Radioactive Wastes) Rules, 1987 and the AERB Safety Code govern radioactive waste; India follows a closed fuel cycle.
- Vitrification: converting high-level waste into stable glass blocks; India is among the few countries with the technology, developed by BARC.
- Emergency planning: a 16-kilometre Emergency Planning Zone around each plant, with on-site and off-site plans approved by the AERB and folded into district disaster plans.
- Beyond electricity: BARC has released 70 crop varieties including TBM-9 banana and RTS-43 sorghum, and 40 gamma irradiation facilities are operational.
- Materials: India's first Certified Reference Material for rare earths, Ferrocarbonatite BARC B1401, is the fourth such standard globally.
For UPSC: The place to source a like-for-like emissions comparison between clean sources, and the clearest single account of India's radioactive waste and nuclear emergency framework. Use it on the energy transition, on pollution abatement and on disaster preparedness for technological hazards.
What it is NOT: The 5.4 million tonne figure is not what India's nuclear fleet actually avoids — it is a rate per gigawatt of installed capacity, and the fleet is 8.78 GW.
For Mains
Syllabus: GS3.14 · GS3.15 · Linkage L2
Anchor
The comparison being made is not nuclear against coal but nuclear against wind and solar, and it is made per gigawatt installed — which turns an emissions claim into a claim about how many hours a plant runs.
Substantiation (data)
5.4 million tonnes of CO₂e avoided per GW in FY 2025-26 against 2.7 for hydro, 1.6 for wind and 0.9 for solar, and 851 million tonnes cumulatively since 1969.
Exemplification
The first hydrogen produced anywhere from nuclear process heat, at Kalpakkam in 2026, extends the decarbonisation claim past electricity into industrial heat.
Problematisation
A per-gigawatt rate flatters a fleet of 8.78 GW, and the dose, waste and emergency architecture described here is a permanent institutional cost that wind and solar do not carry.
Way-forward
The backgrounder's own conclusion is complementarity — nuclear for round-the-clock baseload, renewables for volume — rather than a choice between them.
Position
Nuclear's environmental case rests on availability rather than on emissions per unit: most of the distance between 5.4 and 0.9 million tonnes is the distance between running always and running sometimes.
Deploys into: Conservation and pollution + disaster management (GS3.14, GS3.15) · low-carbon baseload power, radioactive waste management and nuclear emergency preparedness.
Department of Atomic Energy · 2026-08-28 · PRID 2304032 · PIB source ↗