Home / Case Files / Genkai 2025

• 26 July 2025Date of incident
• 5 witnessesSecurity guards + police officer
• 3 lightsNumber observed
• 2+ hoursDuration of observation

The Site

The Genkai Nuclear Power Plant is operated by Kyushu Electric Power Company on the Higashi-Matsuura Peninsula in Saga Prefecture on the north coast of Kyushu, approximately 50 kilometres west of Fukuoka. Two reactors are in operation, Units 3 and 4, both pressurised water reactors. Unit 1 was permanently shut down in 2015 and Unit 2 in 2019. The plant occupies a coastal site overlooking the Genkai Sea and the Iki and Tsushima island chains. Under the post-Fukushima Nuclear Regulation Authority security framework, the facility is classified as a critical infrastructure site requiring twenty-four-hour armed security presence, augmented by a stationed police officer assigned by the Saga Prefectural Police.

The Observation

The first sighting was logged shortly after sunset on the evening of 26 July 2025. Three lights, described by the witnesses as resembling drones in their motion characteristics but inconsistent with drone signatures in other respects, were observed in the airspace above and immediately adjacent to the reactor buildings. The lights did not emit sound that could be detected from the ground perimeter at the witnesses' positions. They held position with corrections suggestive of active control rather than passive drift. They did not display navigation lights of any pattern recognisable to the witnesses from prior drone or aircraft encounters at the site.

The observation continued for in excess of two hours. The Nuclear Regulation Authority was notified during the event. The Saga Prefectural Police were notified. The plant's own surveillance overflight schedule was checked: no Kyushu Electric Power Company drone activity had been authorised for that period. The flight plans on file with the Land Ministry for that night were checked: no civilian or commercial aircraft was scheduled to operate in the airspace at the relevant altitudes. The Japan Self-Defense Forces were not exercising in the area. The lights eventually departed in the early hours of the following morning. No physical object was recovered. No conclusive identification was made.

The Institutional Response

On 28 July 2025 the Japan Times reported that suspected drone flights over the Genkai plant had not been confirmed. The story circulated through the national press over the following week. The Nuclear Regulation Authority confirmed the incident but did not characterise its origin. The Ministry of Defense was queried by the press; the Defense Minister did not initially comment. On 7 August 2025 the cross-party Parliamentary Group for the Study of Unidentified Anomalous Phenomena from a National Security Perspective convened a closed-door hearing on the incident with officials from the Nuclear Regulation Authority, the Ministry of Defense, and the Ministry of Land, Infrastructure, Transport and Tourism. The hearing was not open to press.

The institutional positioning of the incident shifted over the following months. By October 2025 the Genkai event had become part of the Parliamentary Group's case-work briefing material. By February 2026 the United States executive order on UAP disclosure had reframed the international institutional context. By the Group's 4th General Assembly on 30 March 2026 the Genkai incident was named explicitly in the formal proposal submitted to Chief Cabinet Secretary Minoru Kihara as the operational precedent justifying the establishment of a centralised UAP intelligence office under the Deputy Chief Cabinet Secretary for Crisis Management. The case remains the most significant institutional reference point for the present Japanese UAP framework.

The Wider Pattern

The Genkai incident sits inside a long-documented international pattern of unidentified aerial phenomena observed at nuclear infrastructure. The United States record on this point begins with the March 1967 Malmstrom Air Force Base incident in Montana, in which ten Minuteman intercontinental ballistic missiles went off-alert during a UAP observation by site personnel. The Robert Hastings UFOs and Nukes documentary record assembles approximately 150 incidents at US nuclear weapons and power facilities from 1948 through to the present. The Soviet and Russian record at nuclear sites includes the October 1982 incident at a missile base in Ukraine documented in the AAWSAP Russian-files material, in which the launch sequence for nuclear-armed missiles was reportedly activated by an external source during a UAP observation. The Fukushima Daiichi power station observed multiple UAP-type events during the March 2011 disaster sequence. The Genkai incident is the first Japanese incident at a civilian nuclear power facility to enter the formal institutional record at the Diet level.

Witnesses

The five named witnesses are protected under standard Japanese nuclear-site security protocols and their full identities are not on the public record. Their professional functions are: four Kyushu Electric Power Company contracted security personnel on perimeter duty, and one Saga Prefectural Police officer assigned to permanent stationing at the facility under the post-Fukushima Critical Infrastructure Security Framework.

Source Documents

From the Archive

• Japan disclosure page
• Malmstrom Air Force Base, 1967, the canonical nuclear-site UAP case
• Operação Prato, 1977, a long-duration multi-witness observation case
• On the Record, the witnesses