References 465% CONFIDENCEOverall confidence: 65%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 from 50% to 74% confidence

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]50%
  youtube.com/watch?v=n_cqgL2UZFk

  youtube.com· Posted Sep 14, 2026· Starts Apr 13, 2026 ✓· Ends Dec 31, 2035· 35% of score

  A target, per the source: the collider is "expected to become operational in the early to mid-2030s". Construction start: Brookhaven Lab, 13 Apr 2026: "Work begins today ... to remove components from the Relativistic Heavy Ion Collider (RHIC)" - "the first step in transforming the renowned collider into ... the Electron-Ion Collider (EIC)"; the old 2033 date was the source's hoped-for operation, not a construction date. Completion: DOE Office of Science FY 2027 Congressional Justification (Nuclear Physics, May 2026), 20-SC-52 EIC: "The estimated completion date (CD-4) of 1Q FY 2036 includes schedule contingency validated by peer review" (1Q FY 2036 = Oct-Dec 2035; CD-4 = "Approve Start of Operations or Project Closeout").

• [2]80%
  Science/Nuclear Physics FY 2027 Congressional Justification (20-SC-52 Electron Ion Collider)

  science.osti.gov· Added Sep 28, 2026· Ends Dec 31, 2035 ✓· 36% of score

  DOE's own project data sheet puts CD-4 (start of operations/project closeout) in 1Q FY 2036, i.e. by 31 Dec 2035, including peer-reviewed schedule contingency; the project has no CD-2 performance baseline yet, so this is a target. PDF created 7 May 2026.^[1]

• [3]85%
  EIC steps towards construction – CERN Courier

  cerncourier.com· Published Mar 1, 2026· 16% of score

  CERN Courier's own headline, 'EIC steps towards construction,' published March 2026, tracks the same progress toward the collider's targeted early-to-mid-2030s completion reflected in the pin's stored December 2033 date.

• [4]92%
  Electron-Ion Collider Achieves Critical Decision 1 Approval – U.S. Department of Energy

  energy.gov· Published Jan 1, 2026· 13% of score

  The U.S. Department of Energy's own headline reports the Electron-Ion Collider achieving 'Critical Decision 1 Approval,' a project milestone consistent with the pin's stored construction timeline toward an early-to-mid-2030s operational date.

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