Oklo's Groves Isotope Test Reactor Achieves First Criticality on Private Land

Oklo's Groves Isotope Test Reactor Achieves First Criticality on Private Land

Advanced fission developer Oklo Inc. (NYSE: OKLO) has achieved a landmark technical and commercial milestone, demonstrating its rapid reactor deployment capability while reporting its first-ever quarterly revenue. On August 5, 2026, the company's Groves isotope facility in Texas achieved first criticality, completing its transition from a greenfield site to an operational nuclear facility in approximately 11 months.

Built through private capital and commercial execution under Department of Energy (DOE) oversight, the Groves facility represents the fastest transition from greenfield to criticality for a full-scale, privately funded and privately sited reactor in history. This milestone establishes a repeatable blueprint for Oklo's future commercial deployments, including its planned Aurora powerhouse builds.

Q2 2026 Financial Performance and Raised Guidance

In its Q2 2026 earnings report on August 7, 2026, Oklo reported several key financial developments:

• First-Ever Revenue: Oklo recorded $1.2 million in revenue, significantly exceeding analyst expectations of $83,800. This revenue was generated from technical services via its strategic acquisitions of ARMEC and Creative Engineers, Inc. (CEI), both of which bring specialized manufacturing, engineering, and alkali-metal systems expertise to secure Oklo's supply chain.¹
• Net Loss and Capitalization: The company reported a Q2 net loss of $48.5 million (and a year-to-date net loss of $81.6 million), with an adjusted EPS loss of $0.28 per share vs. a $0.16 forecast. This was offset by $44.5 million in net interest and dividend income.
• Strong Liquidity: As of June 30, 2026, Oklo's balance sheet held $3.0 billion in cash and marketable securities, bolstered by $1.9 billion raised through at-the-market (ATM) equity offerings in the first half of the year. Its current ratio stands at an exceptional 59.93.
• Raised 2026 Guidance: To reflect accelerated project work and early deployment spending, Oklo raised its 2026 guidance. Cash operating outflows are now expected to be $120 million to $150 million (up from $80 million to $100 million), and capital expenditures are projected at $400 million to $500 million (up from $350 million to $450 million).

Vertically Integrated Strategy and Milestones

Oklo's investment thesis centers on its "integrated nuclear flywheel," combining Power (baseload generation), Fuel (fabrication and recycling), and Isotopes (high-value domestic supply) into a single platform:

1. Power: The 75 MWe Aurora-INL project in Idaho remains targeted for commercial operations in 2028, having recently received DOE approval for its Preliminary Documented Safety Analysis (PDSA).
2. Fuel: Startup of the Aurora Fuel Fabrication Facility is planned for 2027, with equipment currently in production. Oklo also secured a Letter of Intent with Centrus to supply domestic High-Assay Low-Enriched Uranium (HALEU) from its Pike County, Ohio plant starting in 2029, enough to support up to five Aurora powerhouses.
3. Isotopes: First isotope revenue is expected in early 2027 from the Idaho Radioisotopes Laboratory, while the newly critical Groves facility is projected to begin producing R&D quantities of isotopes within 12 months.

"We are not building three isolated businesses. We are building one integrated nuclear technology platform across power, fuel, and isotopes... We are putting assets on the ground. We’ve successfully gone critical, now we’re really just looking at more that we can do to provide assurance around asset deployment for all three businesses." — Jake DeWitte, CEO, and Craig Bealmear, CFO of Oklo Inc.