Qualla: Ōi Nuclear Power Plant

Ōi Nuclear Power Plant: Introduction

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 藤谷良秀(Yoshihide Fujitani), CC BY-SA 4.0. On 1 July 2012, a control room on a rocky promontory above Wakasa Bay hummed back to life. Reactor No. 3 at the Ōi Nuclear Power Plant had just become the first nuclear reactor in Japan to restart since the Fukushima disaster, ending a two-month period during which the world's third-largest economy operated without a single watt of nuclear power. Outside the plant's gates, thousands of protesters had gathered. Inside, engineers from the Kansai Electric Power Company watched their instruments with a mixture of relief and anxiety. The decision to restart Ōi had split Japanese society in two, and the arguments reverberating from this stretch of Fukui Prefecture's coast would define the nation's energy debate for a decade.

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Image: 藤谷良秀(Yoshihide Fujitani) | CC BY-SA 4.0

Ōi Nuclear Power Plant: The Nuclear Coast

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Gtogk, CC BY-SA 4.0. The Ōi plant sits in the small town of Ōi on the southern shore of Wakasa Bay, a rugged inlet on the Sea of Japan side of Honshu. This stretch of Fukui Prefecture coastline is sometimes called "Nuclear Alley" because it hosts more reactors per kilometer than anywhere else on Eart...

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Image: Gtogk | CC BY-SA 4.0

Ōi Nuclear Power Plant: Flashpoint After Fukushima

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Greg Webb/IAEA Imagebank, CC BY-SA 2.0. After the Fukushima Daiichi disaster in March 2011, all of Japan's 54 commercial reactors were gradually taken offline for safety checks. By May 2012, the country had zero nuclear power for the first time in over 40 years. The government faced an estimated 18 percent power shorta...

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Image: Greg Webb/IAEA Imagebank | CC BY-SA 2.0

Ōi Nuclear Power Plant: The Brief Revival

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Greg Webb/IAEA Imagebank, CC BY-SA 2.0. Despite the opposition, Ōi's Reactor No. 3 reached criticality on 2 July 2012, and Unit 4 began generating power on 21 July. For a brief window, they were Japan's only operating nuclear reactors, supplying power to millions across the Kansai region during the sweltering summer mo...

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Image: Greg Webb/IAEA Imagebank | CC BY-SA 2.0

Ōi Nuclear Power Plant: Courts, Decommissions, and a Second Restart

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Gtogk, CC0. The legal battles were just as intense as the street protests. In May 2014, the Fukui District Court ruled that Ōi Units 3 and 4 could not restart, a landmark decision that placed judicial authority against the government's energy policy. Meanwhile, the aging Units 1 and 2, which...

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Image: Gtogk | CC0

Ōi Nuclear Power Plant: A Coastline of Contradictions

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit IAEA Imagebank, CC BY-SA 2.0. Ōi's story is one of contradictions that define modern Japan. A nation with virtually no domestic fossil fuel resources built dozens of reactors along its most earthquake-prone coastlines. A technology that promised energy independence became the source of the country's deepest c...

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Image: IAEA Imagebank | CC BY-SA 2.0