FSG says it supported Oklo's Groves test reactor as it reached first criticality

By Atlas Watchline Staff · Corporate · August 25, 2026

Facility Solutions Group said it helped with electrical, controls and verification work on Oklo Inc.'s Groves Isotope Test Reactor, which the companies said reached first criticality on Aug. 5, 2026.

Facility Solutions Group said it helped with electrical, controls and verification work on Oklo Inc.'s Groves Isotope Test Reactor, which the companies said reached first criticality on Aug. 5, 2026.

Facility Solutions Group said it supported Oklo Inc.'s Groves Isotope Test Reactor project, a low-power test reactor that the release said reached first criticality on Aug. 5, 2026. First criticality refers to a controlled, self-sustaining nuclear chain reaction.

The company said the reactor became the fifth reactor authorized under the U.S. Department of Energy's Reactor Pilot Program to reach that milestone. The release also said Groves was the first reactor under the program to do so on private land.

FSG, based in Locklock, Texas, said it joined the project in April 2026 and handled electrical work, instrumentation, controls, testing and verification. Century Construction served as general contractor, according to the release.

The company quoted FSG Construction Manager Kris Price as saying Century and Oklo trusted FSG with work that was critical to the project's success and that the team embraced the responsibility from day one.

The release also described FSG as one of the largest commercial electrical contractors and single-source facility solutions providers in the United States, with headquarters in Austin, Texas, more than 43 years in business and annual revenue exceeding $1 billion. It said the company operates across the United States.

Oklo said it is developing fast fission power plants, building a domestic supply chain for critical isotopes and advancing technologies to recycle used nuclear fuel into new reactor fuel. The release said Oklo was the first to receive a site-use permit from the DOE for a commercial advanced fission plant and has been awarded fuel from Idaho National Laboratory for its first powerhouse in Idaho.

The companies' announcement was published Aug. 25, 2026, after the reactor milestone earlier in the month.

Sources

• PR Newswire: FSG supports Oklo's Groves Isotope Test Reactor project

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