Fifteen years after the Fukushima meltdown shattered public trust in atomic power, Japan is moving to bring major reactors back online and rebuild a nuclear fleet that once supplied a third of its electricity. The decision marks a profound shift in national energy strategy, balancing memories of disaster against the pressures of climate targets, fuel costs, and grid stability. As the first large units restart, the country is testing whether new safeguards and political assurances can overcome deep local resistance.
The renewed push is centered on the Kashiwazaki-Kariwa complex, often described as the world’s largest nuclear power station, and on a broader policy to restore nuclear generation as a core pillar of Japan’s energy mix. The stakes extend far beyond one plant, touching everything from regional safety fears to the credibility of Japan’s climate pledges and its ability to shield households and industry from volatile fossil fuel markets.
From Fukushima shock to cautious revival
The 2011 crisis at Fukushima Daiichi, located about 220 kilometers or 135 miles northeast of Tokyo on the Pacific coast, was a defining trauma for modern Japan. A massive earthquake and tsunami triggered core meltdowns, hydrogen explosions, and widespread radioactive leakage, forcing evacuations and leaving Local communities with long-term contamination and social disruption. In the years that followed, almost the entire nuclear fleet was idled, and public opinion hardened against an industry that had once been sold as safe and indispensable.
Over time, however, energy realities have pushed policymakers back toward nuclear power. As analysts of Fukushima and its aftermath note, the meltdown all but shut down Japan’s reactors, but it also exposed the vulnerabilities of a system suddenly dependent on imported fossil fuels. The government has since layered on a host of new safety measures, from higher seawalls and backup power systems to stricter oversight of evacuation planning, while arguing that nuclear generation is needed to cut emissions and stabilize prices. That logic underpins the current effort to restart reactors under far tougher conditions than those that prevailed before 2011.
Kashiwazaki-Kariwa and the one-day restart
The most symbolic test of this new era is unfolding at the Kashiwazaki-Kariwa plant on the Sea of Japan coast, which has long been described as the world’s largest nuclear power station by capacity. After a 15-year shutdown, Japan is set to bring units at this sprawling site back into service, even as a Petition signed by 40,000 residents and activists has raised concerns over seismic risk and evacuation routes in the vicinity of the Kashiwazaki-Kariwa plant. The petition underscores how Local communities, still affected by the fallout from Fukushima Daiichi, remain wary of any assurances that new engineering and oversight can fully contain the risks of another major accident.
Those anxieties were sharpened when a reactor at the same complex, reactivated on Jan 21 for the first time since 2011, was quickly taken offline again. Reporting on the shutdown describes how the unit, heralded as a milestone in Japan’s nuclear comeback, ran for only a single day before operators halted operations. A related account notes that a reactor at the largest nuclear power station in the world was reactivated on Jan 21, then suspended after one day, a sequence that highlighted both technical caution and the political sensitivity of any irregularity at such a high-profile site still affected by the fallout of Fukushima. Coverage of how operations were suspended only hours after the restart, in a segment focused on developments in Japan, reinforced the sense that every valve and sensor at Kashiwazaki-Kariwa is now under national and international scrutiny.
TEPCO’s return and the politics of trust
The company at the center of both Fukushima Daiichi and Kashiwazaki-Kariwa, Tokyo Electric Power, is attempting a fraught return to normal operations. Earlier this year, Tokyo Electric Power restarted a reactor at the Kashiwazaki-Kariwa plant, a move described as the first such step for the utility since the Fukushima disaster and framed as part of a broader national push to revive nuclear generation since Fukushima. A related account notes that on Jan 21, 2026, at 3:53 AM PST, the company brought a unit back online, with plans to ramp up output by the end of February, underscoring how carefully choreographed the restart schedule has become in light of public concern. By Reuters. For a utility whose name is synonymous with the meltdown, every procedural step now doubles as a political test.
National energy strategy adds another layer of complexity. Analysts of Inside Japan and its Controversial Shift Back to Nuclear Energy describe how the government is repositioning atomic power as a central tool for cutting emissions and reducing dependence on imported gas and coal. That shift has been clouded by scandals, including allegations that operators such as Chubu Electric Power fabricated seismic risk data, which have fueled skepticism about whether regulators can truly enforce the tougher standards adopted after Fukushima. Against this backdrop, the restart of Kashiwazaki-Kariwa by Tokyo Electric Power is not only a technical milestone but also a referendum on whether the public believes that the culture of safety has genuinely changed.
Climate goals, public resistance, and what comes next
Japan’s broader nuclear reboot is framed by climate commitments and the limits of its geography. As a densely populated, mountainous country with limited space for large-scale onshore wind and solar, Japan has long leaned on nuclear power to provide low-carbon baseload electricity suited for its terrain. Analysts who describe how the Fukushima meltdown was a nightmare that all but shut down Japan’s nuclear industry also note that the country is now layering in a host of new safety measures as it reconsiders the role of reactors in meeting emissions targets and stabilizing the grid. The argument is that without a significant nuclear component, Japan would struggle to cut carbon dioxide fast enough while keeping factories running and homes heated at predictable prices.