X-energy: Funding Rounds + Capital Stack
| Round | Date | Amount | Lead Investors | Notes | |
|---|---|---|---|---|---|
| Founder + early-stage equity | 2009-2019 | ~$50M cumulative | Energy Impact Partners + ARES Power + Founders' equity | Pre-DOE ARDP scale | |
| DOE ARDP Phase 1 award | Oct 2020 | $80M (initial) | DOE Office of Nuclear Energy | Selected alongside TerraPower as one of two flagship advanced reactor demos | |
| Series B (Citadel + Cavendish lead) | Feb 2022 | $80M | Citadel + Cavendish + Segra Capital | Pre-Series C growth equity | |
| DOE ARDP Phase 2 ramp | 2022-2024 (multi-year) | Up to $1.2B cumulative (DOE share) | DOE Office of Nuclear Energy | Ongoing cost-share through Xe-100 FOAK | |
| Pre-Series C convertible note + bridge | 2023 + early 2024 | ~$120M | Existing investors + new strategic | Bridge to Amazon round | |
| Series C-1 (Amazon lead) | Oct 2024 | $500M (Amazon-led; rumored $600M+ all-in) | Amazon (Climate Pledge Fund) + Citadel + Cavendish + Segra + others | Marquee advanced-reactor + hyperscaler deal; Amazon also announces Energy Northwest Hanford commitment | |
| Total capital raised (private equity + DOE cost-share) | ~$2.5B+ cumulative | Through 2025-Q3 | Combined public + private financing stack | One of the most-funded advanced reactor developers globally | |
| Cash runway implied | ~$1.0B+ cash + STI estimated 2025-Q3 | Quarterly burn ~$50-70M (heavy engineering + TRISO-X facility construction) | Estimated 12-15 quarters runway absent additional raise | Likely additional raise needed before FOAK COD ~2030 | |
| Editorial. Why this matters | Strategic context | X-energy's capital stack reflects the most-validated advanced reactor + hyperscaler convergence to date. The Amazon Oct 2024 Series C-1 was the marquee deal of 2024 in advanced nuclear. Marquee question: does the existing $2.5B+ capital stack carry X-energy through Xe-100 FOAK COD (target 2030) or does another mega-round close before commercial operation? |
Updated at 2025-Q3
X-energy: Xe-100 HTGR Customer Pipeline (Project-by-Project Status)
| Customer | Location | Status | Units / MWe | Target COD | |
|---|---|---|---|---|---|
| Amazon + Energy Northwest (Hanford WA) | Hanford WA federal site (~960 MWe target) | Site licensing + project development (Amazon-funded; Oct 2024) | Up to 12 modules / ~960 MWe | 2030-2032 (Amazon-stated long-term target) | |
| Dow Chemical (Seadrift TX) | Dow Seadrift petrochemical complex | DOE ARDP partner site; FEED + early engineering (since 2022) | 4 modules / ~320 MWe (process heat + electricity) | 2030 stated | |
| Energy Northwest (additional sites) | Pacific Northwest (multiple potential sites beyond Hanford) | Pre-application engagement | TBD | Beyond 2032 | |
| Cavendish + UK government (UK) | UK site selection ongoing | UK pre-licensing engagement | TBD | Beyond 2032 | |
| Other US industrial sites (Dow + adjacent) | Multiple petrochemical + industrial counterparty discussions | MoU + early engineering | Various module counts | Beyond 2030 | |
| TRISO-X fuel facility (Oak Ridge TN) | Oak Ridge TN; DOE-funded construction | Construction in progress; first fuel target 2027-2028 | 8 metric tons HALEU/yr target capacity | TRISO-X facility COD 2027-2028 | |
| Editorial. Why this matters | Strategic context | X-energy is structurally unique among advanced reactor developers: it sells the reactor + the fuel (TRISO-X) as an integrated product, like a vertically-integrated SaaS bundle. Amazon's Series C-1 investment + Hanford project commitment (Oct 2024) is the largest single commitment to any advanced reactor developer. Marquee question: does X-energy convert Amazon + Energy Northwest + Dow + UK customer interest into a FOAK COD by 2030, or does the schedule slip into 2031-2033? |
Updated at 2025-Q3
X-energy in Nuclear
X-energy
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Developer of the Xe-100 80 MWe high-temperature gas reactor (4-pack 320 MWe). Recipient of approximately $1.2B in DOE ARDP awards. Amazon-led Series C-1 of approximately $500M of a $700M round in October 2024. Customer commitments include Dow Seadrift (Texas) and Energy Northwest (Washington, 5 GW by 2039).