TLDR
- Oklo’s Groves Isotope Test Reactor in Lockhart, Texas received DOE approval for its Documented Safety Analysis (DSA), clearing the final safety hurdle before startup.
- The reactor is now in the DOE’s final pre-startup review phase, with first criticality targeted for July 2026.
- Groves is the first advanced reactor on privately owned land to receive DSA approval, using fully commercially sourced fuel and equipment.
- OKLO stock jumped 5% in premarket trading on the news; the stock trades at a $9.1 billion market cap but is down 27% over the past six months.
- The Groves reactor is an isotope facility, not a power generator — Oklo’s commercial electricity ambitions rest on its larger Aurora powerhouse design, still in development.
Oklo’s Groves Isotope Test Reactor in Lockhart, Texas has cleared a major regulatory hurdle. The U.S. Department of Energy approved the Documented Safety Analysis for the facility on Wednesday, moving Oklo one step closer to its first reactor startup.
$OKLO received DOE approval for the Documented Safety Analysis for its Groves Isotope Test Reactor.
The project now advances to readiness review, fuel loading and first criticality which Oklo continues to target for July 2026. pic.twitter.com/cTSPnnmQto
— Shay Boloor (@StockSavvyShay) July 1, 2026
OKLO stock jumped 5% in premarket trading on the news. The stock currently sits at a $9.1 billion market cap, though it has dropped 27% over the past six months.
The DSA is the facility’s final safety basis document. With it approved, Groves now enters DOE’s final pre-startup review phase — a process that includes a readiness review and startup approval before nuclear fuel can be loaded and testing can begin.
Oklo is targeting first criticality for Groves in July 2026. First criticality is the moment a reactor achieves a controlled, self-sustaining nuclear chain reaction.
The timing matters. Oklo was selected last year for a DOE initiative to deploy at least three test reactors at national laboratories by July 4. The company confirmed it is on track to meet that target.
CEO Jacob DeWitte called it a milestone in a statement, noting that Groves is “the first advanced reactor project to receive approval of its Documented Safety Analysis that is on privately owned land, with wholly commercially sourced fuel, equipment, and systems delivered by the private sector.”
The company broke ground on the Groves facility less than a year ago. Construction and operations have been led by a private-sector team under DOE oversight.
What Groves Is — and Isn’t
It’s worth being clear about what Groves does. The reactor is an isotope production facility, not a power plant. It won’t generate electricity.
Its purpose is to produce radioisotopes used in cancer diagnosis and treatment, advanced manufacturing, scientific research, space exploration, and national security. The U.S. currently depends heavily on overseas suppliers and aging domestic facilities for these materials.
Oklo’s commercial power ambitions are tied to its Aurora powerhouse design, a fast fission reactor it is developing at Idaho National Laboratory. A fuel fabrication facility is also under construction there. The DOE has already approved the Preliminary Documented Safety Analysis for the Aurora project.
What Else Is in the Pipeline
Oklo has been active beyond Groves. The company recently acquired Creative Engineers, Inc., a firm with expertise in sodium and alkali-metal systems.
It also signed a Letter of Intent with Centrus Energy Corp. to purchase high-assay low-enriched uranium (HALEU) for its Aurora powerhouse in Ohio, with deliveries expected to begin in 2029.
Oklo and Standard Nuclear entered a memorandum of understanding to explore nuclear fuel recycling and advanced fuel manufacturing, focused on materials from a planned facility in Oak Ridge, Tennessee.
Guggenheim initiated coverage on Oklo with a neutral rating, projecting EBITDA to turn positive by 2030.
InvestingPro data shows Oklo holds more cash than debt on its balance sheet. The same analysis notes the stock appears slightly overvalued relative to its Fair Value estimate.
The next formal step for Groves is DOE’s readiness review and startup approval before fuel loading can proceed.
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