The Fukushima disaster triggered a global rethink on nuclear energy, yet fifteen years on, Japan is returning to nuclear power. Analyse the factors driving this reversal and its implications for global energy transition.

Q. The Fukushima disaster triggered a global rethink on nuclear energy, yet fifteen years on, Japan is returning to nuclear power. Analyse the factors driving this reversal and its implications for global energy transition. (15 marks, 250-350 words)

The March 2011 Fukushima Daiichi accident — rated INES Level 7, the maximum, alongside Chernobyl [1] — pushed Japan to idle all 54 reactors, collapsing nuclear's share from about 30% of electricity. Yet Tokyo's Seventh Strategic Energy Plan (February 2025) now targets a 20% nuclear share by 2040 [2], marking a decisive reversal driven by security, economic and climate compulsions.

Factors driving the reversal - Energy insecurity: Japan imports roughly 90% of its energy. The post-2011 pivot to LNG, coal and oil exposed it to price shocks, sharpened by the 2022 Russia-Ukraine war. - Economic cost: Fossil-fuel import bills worsened the trade balance; restarts are expected to displace costly natural gas generation [3]. - Rising demand: Electricity demand is climbing on the back of AI data centres, despite a shrinking population. - Decarbonisation: Thermal expansion raised emissions, conflicting with Japan's 2050 carbon-neutrality goal; the 2025 plan pairs nuclear (20%) with renewables (40-50%) [2]. - Shifting public mood: Demands for immediate phase-out fell sharply over the last decade, though local consent remains decisive — Niigata cleared Kashiwazaki-Kariwa Unit 6 only in December 2025, restarting February 2026 [3].

Implications for global energy transition - Validation of nuclear as firm clean power: Global nuclear generation is set for record highs, with over 60 reactors under construction and government interest at its highest since the 1970s oil crisis [4]. - Reframing energy security: Nuclear is increasingly read as insurance against import dependence, not merely a climate tool [4]. - Unresolved costs: Only 14 of 54 Japanese reactors have restarted [3]; permanent radioactive-waste disposal, high capital costs and long gestation temper the optimism. - Lessons for India: Reinforces the case for expanding civil nuclear capacity and SMRs alongside solar.

Japan's turn shows that credible regulation and community consent, not technology alone, determine nuclear's viability. A transition that is both secure and low-carbon needs nuclear as a complement to renewables, backed by transparent safety governance — the enduring lesson of Fukushima.

(~330 words)

Sources: 1. IAEA — Fukushima Daiichi Nuclear Accident — INES Level 7 rating; worst accident since Chernobyl 2. METI — Cabinet Decision on the Seventh Strategic Energy Plan (18 Feb 2025) — 20% nuclear and 40-50% renewables by FY2040 3. U.S. EIA — Nuclear reactor restart in Japan will likely displace natural gas electricity generation — 14 reactors restarted since 2011; Kashiwazaki-Kariwa Unit 6 restart; gas displacement 4. IEA — The Path to a New Era for Nuclear Energy — record global nuclear output, 60+ reactors under construction, energy-security drivers