February 2026 strategic relationship formed concurrent with $80M financing. Blue Owl Capital's Real Assets platform (alternative asset manager) and Deep Fission will collaborate to deploy Deep Fission SMRs for Blue Owl's digital infrastructure portfolio — bringing round-the-clock clean power to US data centers. First major institutional alternative asset manager partnership in the dataset. Distinct from Endeavour's direct co-development model — Blue Owl is a platform-level capital + portfolio partner.
Deep Isolation (founded 2016 by same Muller father-daughter team) provides the directional drilling + borehole engineering foundation that Deep Fission leverages. Deep Isolation's technology was originally developed for long-term nuclear waste disposal in deep boreholes. The reactor concept arose from a Deep Isolation customer's hypothetical question about pressurization. Deep Isolation also recently validated borehole disposal for recycled spent nuclear fuel waste. Strategic relationship: shared founding team, shared engineering foundation, separate corporate entities.
October 2025 disclosure: 12.5 GW of non-binding letters of intent across data center developers, industrial parks, and other strategic partners. Individual agreements range from <1 GW to 2 GW. Includes the previously announced 2 GW Endeavour deal. Initial commercial-scale construction targeted 2027-2028 depending on DOE/NRC approval pace. Construction lead site candidates: Utah, Texas, Kansas.
January 2025 strategic partnership announced. Deep Fission and Endeavour committed to co-develop 2 GW of nuclear energy to power Endeavour's expanding global portfolio of Edged data centers. Edged data centers are notable for being water-free (no evaporative cooling) — pairs well with Deep Fission's zero-water-impact reactor model. First reactors targeted operational 2029. Use of "global" suggests potential international deployment beyond US.
Deep Fission's flagship reactor — 15 MWe pressurized water reactor placed 1 mile underground via a 30-inch borehole. **Reactor renamed from DFBR-1 (Deep Fission Borehole Reactor-1) to "Gravity" in late 2025**. Approximately 9 meters tall, ~0.75m wide. Uses standard PWR design, standard LEU fuel, and standard PWR water chemistry — no novel reactor physics. **Structural cost innovation**: hydrostatic pressure of the 1-mile-deep water column (~2,200 psi) naturally pressurizes the reactor, eliminating the expensive surface pressure vessel and containment dome. Combines PWR technology + oil/gas borehole drilling + geothermal heat-transfer methods. Estimates 70-80% construction cost reduction vs traditional nuclear. Modular siting: 10 reactors = 150 MWe; 100 reactors = 1.5 GW on ~3 surface acres. Target: $0.05-0.07/kWh.
Deep Fission's pilot reactor and first commercial-scale plant location. **Broke ground December 9, 2025** — same week as DOE agreement signed. Targeting July 4, 2026 criticality under the DOE Reactor Pilot Program (Trump May 2025 executive orders). Plan: drill the borehole, lower the reactor canister on a wire, load fuel, achieve criticality underground. Site selection: Great Plains Industrial Park in Parsons KS — chosen for geological stability, deep-beyond-water-table characteristics, and existing industrial park infrastructure. Plans to build a full-scale commercial plant at the same location after the pilot demonstration.
Pre-seed funding round closed August 22, 2024. Led by 8VC venture capital firm with other unlisted investors. Marked Deep Fission's exit from stealth mode.
Heavily oversubscribed private placement at $3.00 per share simultaneous with reverse-merger transaction with Surfside Acquisition (took Deep Fission public). Triggered by federal executive orders accelerating DOE advanced-reactor timelines from 2029 to 2026. Funds initial Parsons KS pilot reactor build.
$80M financing through 5,333,333 restricted common shares at $15.00 per share (5x markup vs September). Seaport Global Securities and The Benchmark Company acted as placement agents. Concurrent strategic relationship formed with Blue Owl Capital's Real Assets platform — alternative asset manager will collaborate to deploy Deep Fission SMRs into Blue Owl's digital infrastructure portfolio. Brings cumulative funding to $114M+.