Criticality before July 4, 2026, as promised: it happened June 18, the only one of four pilot criticalities by July 4 outside a national lab

claim holds uptimeline

What was said

Isaiah Taylor (August 2025 post) (2025-08-12): Valar was selected by DOE "to achieve criticality on American soil by July 4th, 2026".
Valar Atomics Selected for the President's Accelerated Nuclear Program (Isaiah Taylor) (Valar Atomics, 2025-08-12)
Valar Atomics (July 2025 slides; safety agreement milestone table) (2025-07-08): "First Reactor online by July 4, 2026"; initial criticality planned for 30 June 2026.
Valar Atomics + SRERC in Emery County (slide deck marked confidential, posted on the Utah Public Notice Website) (Valar Atomics, 2025-07-08)

What the record shows

DOE, 18 June 2026: Ward 250 'successfully completed a zero-power fueled criticality demonstration', 'the first DOE authorized reactor built outside of a national laboratory'.
Department of Energy Celebrates Second Advanced Reactor Achieving Criticality (U.S. Department of Energy, 2026-06-18)
Of DOE's four summer-2026 criticalities, Ward 250 was the only one outside a national laboratory.
FACT SHEET: The Golden Era of American Nuclear Energy Has Arrived (U.S. Department of Energy, 2026-07-25)
POWER reports that Valar had said in May 2026 its July 4 target was power operations, not zero-power criticality. Valar says it reached full power by 24 June and made electricity on 1 July; DOE has confirmed only the criticality.
Valar Atomic's Ward 250 Becomes Second Reactor to Go Critical Under DOE Pilot Program (POWER magazine, 2026-06-19)

The gap: None. The promised criticality came on 18 June 2026, ahead of the 4 July goal and of Valar's own 30 June target. What was achieved was a zero-power criticality; full power and electricity rest on Valar's account.

In plain termsValar promised DOE, Emery County and investors that its reactor would go critical, meaning start a self-sustaining chain reaction, before July 4, 2026. DOE confirms it did, on June 18, and that it was the first DOE-authorized reactor built outside a national laboratory. That was a real engineering milestone reached on an aggressive schedule. It was a zero-power test; the later power claims are separate entries.

Why it matters: Fairness: the central promise to the public and investors was kept.

What would settle it: Settled by DOE's release.

facts orig-006, orig-010 · checked 2026-10-02: Checked for fairness to Valar, late September 2026: Also checked from the critics' side: DOE's release confirms the 18 June criticality; Valar's own stricter May target (power operations) rests on Valar's account. Holds. Summary line literally true and fair. | Earlier check: Re-read in late September 2026: August 2025 post (quote exact), July 2025 slide 6 (image), NSDA Table 7, DOE release, DOE fact sheet. | Revised before publication (late September 2026): verification wording updated ('summary line').