References 495% CONFIDENCEOverall confidence: 95%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

• [1]95%
  Onagawa Nuclear Power Station Unit 2 starts Commercial Operation

  tohoku-epco.co.jp· Published Dec 26, 2024· Starts Dec 26, 2024· 2% of score

  The source explicitly dates this event.

• [2]95%
  Onagawa 2

  world-nuclear.org· Added Oct 24, 2026· 33% of score

  Reactor timeline, electrical capacity and annual electricity supplied; historical table derived from IAEA PRIS.^[1]

• [3]95%
  OE Information related to Onagawa Unit 2 restart

  genanshin.jp· Added Oct 24, 2026· 33% of score

  Operator-release chronology: first reactor startup October 29, 2024; grid generation November 15; later checks and restarts; commercial return December 26, 2024.^[1]

• [4]95%
  Tohoku Electric Power — CDP disclosure

  tohoku-epco.co.jp· Added Oct 24, 2026· 33% of score

  Restart safety-measures opportunity cost including shared station safety facilities; excludes separately planned later anti-terrorism facilities. Exact quote: “approximately 570 billion yen”.^[1]

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