Office of Nuclear Energy | US Department of Energy(@GovNuclear):CRITICALITY NO. 5! 🕺 On August 5, 2026, at 9:19 PM EST, @Oklo Inc’s Groves test reactor achieved initial criticality at the company’s facility in Lockhart, Texas. It is the fifth nuclear test reactor to go critical under @ENERGY’s Reactor Pilot and Nuclear Energy Launch Pad programs. Congratulations to Oklo Inc.!

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Office of Nuclear Energy | US Department of Energy@GovNuclear

2026.08.06 14:00

CRITICALITY NO. 5! 🕺 On August 5, 2026, at 9:19 PM EST, @Oklo Inc’s Groves test reactor achieved initial criticality at the company’s facility in Lockhart, Texas. It is the fifth nuclear test reactor to go critical under @ENERGY’s Reactor Pilot and Nuclear Energy Launch Pad programs. Congratulations to Oklo Inc.!