AI Data Center Power — Market Intelligence
Pre-IPO Companies Powering AI Infrastructure — Nuclear & Clean Energy
Based on publicly available information. Private companies do not disclose financials. Last updated March 18, 2026.
Company Overview
$136M
total funding raised • Series B
Aalo Atomics is building fully modular nuclear microreactors purpose-built for powering AI data centers. Unlike other SMR companies designing general-purpose reactors, Aalo is the only company designing specifically for data center co-location from day one.1
- HQ: Houston, TX
- Reactor Site: Idaho National Laboratory (INL)
- Stage: Series B
- Employees: ~50-100 (estimated)
- Reactor Design: XMR (eXtra Modular Reactor)
Product — XMR Microreactor
The XMR is a factory-built, truck-transportable microreactor designed for rapid deployment at data center sites. Key specs:2
- Output: Small modular design, scalable in clusters
- Fuel: First U.S. advanced nuclear fuel deal secured (HALEU)
- Deployment: Factory-fabricated modules shipped to site
- Safety: Passive safety systems, walk-away safe design
- Use Case: Behind-the-meter power for hyperscale AI data centers
Aalo's approach is unique: they're building the reactor AND the data center together at Idaho National Lab, proving the integrated concept from day one.
Funding History
| Round | Date | Amount | Lead Investor | Key Participants |
|---|
| Seed + Series A | 2022–2024 | $36M | Various | Early-stage investors |
| Series B | Aug 2025 | $100M | Valor Equity Partners | Hitachi Ventures, NRG Energy, Fine Structure Ventures, Tishman Speyer, 50Y, Alumni Ventures, Crescent Enterprises, Crosscut, Gaingels, Harpoon Ventures, Kindred Ventures, MCJ, Nucleation Capital, Perpetual VC, VamosVentures |
Key Investor Profiles
- Valor Equity Partners (Lead) — Growth equity firm, also led Crusoe Energy. Deep conviction in nuclear + AI infrastructure.3
- Hitachi Ventures — Strategic investor, Hitachi has extensive nuclear engineering experience
- NRG Energy — Major US power company, provides utility-side validation
- Tishman Speyer — Real estate giant, signals data center co-location interest
Partnerships & Customers
- Idaho National Laboratory (INL) — Primary development site for XMR reactor and integrated data center4
- U.S. DOE — Supporting advanced nuclear development through national lab access
- First advanced nuclear fuel deal — Secured HALEU fuel supply (critical bottleneck for SMR industry)
Development Timeline
2022
Company Founded
Initial team assembled, XMR concept developed
Aug 2025
$100M Series B
Led by Valor Equity Partners. 15+ institutional investors.
Aug 2025
INL Groundbreaking
Broke ground on XMR reactor + integrated data center at Idaho National Lab
2025
First Nuclear Fuel Deal
Secured first U.S. advanced nuclear fuel supply agreement
Jul 2026 (Target)
First Reactor Demo
Target date for initial reactor demonstration at INL
Investment Thesis
STRENGTH
Only Data-Center-Native SMR
Purpose-built for AI workloads from day one. Not retrofitting a general reactor.
STRENGTH
Blue-Chip Investor Syndicate
Valor, Hitachi, NRG Energy — strategic + financial investors aligned.
CONSIDERATION
Series B Stage
Early enough for significant upside. $136M total raised vs $500M+ for later-stage peers.
RISK
Execution Risk
Nuclear timelines historically slip. Aggressive July 2026 demo target.
1 TechCrunch, Aug 2025. 2 Aalo Atomics press releases. 3 BusinessWire, Aug 2025. 4 Data Center Frontier, 2025.
Company Overview
$136M+
private funding + $303M DOE award
Kairos Power is a vertically integrated nuclear development company building molten salt reactors (KP-FHR) designed for grid-scale clean energy. Their partnership with Google and the Tennessee Valley Authority (TVA) positions them as the leading SMR play for Big Tech data centers.1
- HQ: Alameda, CA
- Founded: 2016
- Stage: Series B
- Reactor: Hermes (demo) & Hermes 2 (commercial)
- Coolant: Molten fluoride salt (FLiBe)
- Fuel: TRISO pebbles — accident-resistant, meltdown-proof
Technology — KP-FHR
The KP-FHR (Kairos Power Fluoride Salt-Cooled, High-Temperature Reactor) is a novel design combining two proven technologies:2
- TRISO fuel pebbles: Ceramic-coated uranium particles that can withstand extreme temperatures. Each pebble contains thousands of microspheres with multiple containment layers. Physically incapable of meltdown.
- Molten fluoride salt coolant: Operates at low pressure (unlike conventional reactors), eliminating the risk of high-pressure steam explosions. Excellent heat transfer properties.
- Output: Hermes demo = 35 MWt; Hermes 2 = 50 MWe commercial
- Safety: Walk-away safe. No operator intervention needed to shut down safely.
Kairos has thousands of hours of operational data from their Engineering Test Unit (ETU) at their Albuquerque facility — more test data than any other advanced reactor startup.
Funding & Government Backing
| Source | Date | Amount | Type | Details |
|---|
| Early Rounds | 2016–2024 | $36M | Seed/Series A | Initial development capital |
| Series B | Aug 2025 | $100M | Equity | Institutional round |
| U.S. DOE ARDP | Feb 2026 | $303M | Government Award | Milestone-based for Hermes demo reactor3 |
Total capital access: $439M+ (private + government). The DOE award is the strongest government validation any SMR startup has received.
Google Partnership
In August 2025, Kairos Power, Google, and TVA signed a landmark Power Purchase Agreement (PPA):4
- Reactor: Hermes 2 — 50 MWe commercial reactor
- Grid: TVA network in Alabama/Tennessee
- Customer: Google data centers in Jackson County, AL and Montgomery County, TN
- Significance: First commercial PPA between a Big Tech company and an advanced nuclear startup for data center power
This is the gold standard for de-risking: a binding purchase agreement with the world's largest data center operator, delivered through a federally-owned utility (TVA). It validates both the technology and the business model.
Development Timeline
2016
Company Founded
Co-founders saw opportunity to commercialize molten salt + TRISO combination
2023–2024
ETU Operations
Thousands of hours of test data at Albuquerque facility
Aug 2025
Google & TVA PPA
50 MW commercial reactor for Google data centers
Feb 2026
$303M DOE Award
Milestone-based funding for Hermes demo reactor
Jul 2026 (Target)
Hermes Demo Reactor
First demo at Idaho National Lab — 35 MWt
2028–2030
Hermes 2 Commercial
50 MWe commercial reactor online for TVA/Google
1 Wikipedia, Kairos Power. 2 Kairos Power website. 3 Carbon Credits, Feb 2026. 4 Kairos Power/Google/TVA press release, Aug 2025.
Investment Thesis
STRENGTH
Google PPA
Binding purchase agreement with largest data center operator. Revenue visibility.
STRENGTH
$303M DOE Backing
Strongest government validation of any SMR startup. De-risks technology path.
STRENGTH
Most Test Data
Thousands of hours operational data. Ahead of peers on proving the technology works.
RISK
Nuclear Timelines
Industry has a history of delays and cost overruns. Commercial ops targeted 2028-2030.
Company Overview
$314M
total funding raised • Series C
Last Energy builds 20 MWe micro-modular nuclear power plants designed for rapid, factory-fabricated deployment. One unit can power approximately 15,000 homes or a dedicated data center facility.1
- HQ: Austin, TX
- Founded: 2019
- CEO: Bret Kugelmass
- Stage: Series C
- Product: PWR-20 — 20 MWe pressurized water reactor
Product — PWR-20
The PWR-20 is a steel-encased micro-modular reactor using proven pressurized water technology at a fraction of traditional scale:2
- Output: 20 MWe — enough for a mid-size data center
- Design: Entirely factory-fabricated in a steel encasement
- Delivery: Ships as a complete unit, installs on-site
- Technology: Conventional PWR (proven, licensed technology) miniaturized
- Target: Industrial sites, data centers, remote communities
Last Energy's bet: don't reinvent the reactor. Use proven PWR technology, just make it small enough to factory-build. This avoids the NRC risk of novel designs.
Funding History
| Round | Date | Amount | Lead Investor | Key Participants |
|---|
| Seed/Series A | 2019–2023 | $24M | Various | Early investors |
| Series B | 2024 | $40M | — | Brought total to $64M |
| Series C | Dec 2025 | $100M | Astera Institute | AE Ventures, Galaxy Fund, Gigafund, JAM Fund, The Haskell Company, Ultranative, Woori Technology Investment Co.3 |
Key Investor: Astera Institute
Astera Institute is a research organization focused on accelerating science and technology for humanity's benefit. Their lead investment signals conviction in nuclear as critical infrastructure, not just a financial play.
Investment Thesis
STRENGTH
Proven Technology
PWR is the most common reactor type globally. Reduces NRC licensing risk.
STRENGTH
Factory Model
Steel-encased, complete unit ships to site. Faster deployment than bespoke builds.
CONSIDERATION
Series C Stage
$314M total raised. At the upper boundary of early-stage, but still pre-IPO with upside.
RISK
No Demo Yet
Still pre-construction. No operating reactor or test data publicly available.
1 TechCrunch, Dec 2025. 2 Last Energy website. 3 BusinessWire/TechCrunch, Dec 2025.
Company Overview
$525M+
total funding raised • Series D Later Stage
Radiant Nuclear is building portable, mass-produced nuclear microreactors designed to replace diesel generators anywhere in the world. Their reactors can be deployed to data centers, military bases, disaster zones, or remote industrial sites.1
- HQ: El Segundo, CA
- Stage: Series D — Later Stage
- Product: Kaleidos — portable microreactor (1+ MWe)
- First Reactor Test: 2026
Funding History
| Round | Date | Amount | Lead Investor |
|---|
| Seed/Series A | 2020–2022 | $14M | Various |
| Series B | Apr 2023 | $40M | Andreessen Horowitz (a16z) |
| Series C | May 2025 | $165M | Giant Ventures, StepStone, ARK Venture Fund |
| Series D | Dec 2025 | $300M+ | Draper Associates + Boost VC2 |
Investment Thesis
STRENGTH
Portability
Only reactor designed for truck-portable deployment anywhere. Unique use case.
STRENGTH
Top-Tier Investors
a16z, Draper, Giant Ventures — A-list VC backing.
RISK
Past Series C
$525M+ raised at Series D. Less upside than earlier-stage companies.
RISK
Smaller Output
~1 MWe per unit. Needs many units to power a hyperscale data center.
1 Radiant Nuclear website. 2 Reuters, Dec 2025.
Company Overview
$10B+
valuation • Series E IPO Candidate 2026
Crusoe Energy Systems is a data center developer and clean energy power provider. Originally built on converting stranded natural gas into computing power, Crusoe has pivoted to become a full-scale AI cloud infrastructure company — building massive data center campuses with integrated power solutions.1
- HQ: Denver, CO
- Founded: 2018
- Stage: Series E — IPO Candidate
- Total Raised: $2B+ in equity
- Valuation: $10B+ (Oct 2025)
- Customers: Oracle, Microsoft, OpenAI (reported leases)
Funding History
| Round | Date | Amount | Lead/Key Investors |
|---|
| Early Rounds | 2018–2023 | ~$600M | Founders Fund, various |
| Series E | Oct 2025 | $1.375B | Mubadala Capital + Valor Equity Partners |
| Pre-IPO Round | Mar 2026 | TBD | Currently raising at step-up to $10B valuation2 |
| Debt/Project Finance | May 2025 | $11.6B | JPMorgan (construction loan for 1.2 GW Abilene campus)3 |
Key Investors
- Founders Fund — Peter Thiel's VC firm
- Fidelity — Major institutional investor
- Mubadala Capital — Abu Dhabi sovereign wealth fund
- Valor Equity Partners — Also led Aalo Atomics Series B
- ARK Ventures — Cathie Wood's venture fund
IPO Outlook
Crusoe is widely viewed as a 2026 IPO candidate:4
- Hired Michael Gordon as COO/CFO — he led MongoDB's 2017 IPO
- Currently raising pre-IPO round at valuation above $10B
- Building 1.2 GW data center campus in Abilene, TX ($11.6B project)
- Customers include Oracle, Microsoft, OpenAI
- Pre-IPO shares trading on secondary markets at 20-30% premium
For investors: Crusoe is included as a market reference, but at $10B+ valuation and Series E, it's well past the pre-Series C sweet spot. The upside is IPO pop, not early-stage multiples.
Investment Thesis
STRENGTH
Revenue + Customers
Real contracts with Oracle, Microsoft, OpenAI. Revenue-generating, not pre-revenue.
STRENGTH
IPO Readiness
CFO from MongoDB IPO. Pre-IPO round actively raising. Could list in 2026.
RISK
Valuation
$10B+ already priced in. Limited upside vs early-stage nuclear plays.
RISK
Capital Intensive
$11.6B in project finance. Execution risk on massive construction projects.
1 Axios Pro, Mar 2026. 2 Axios Pro, Mar 16, 2026. 3 EquityZen/JPMorgan, May 2025. 4 Crunchbase, Jan 2026.
The AI Power Demand Problem
945 TWh
projected AI data center electricity demand
AI is creating an unprecedented power crisis. Training a single large language model can consume as much electricity as 100 US homes use in a year. Hyperscalers are racing to secure 24/7 baseload power that the existing grid cannot provide.1
Why Nuclear?
- 24/7 Baseload: Solar and wind are intermittent. AI workloads need constant power.
- Power Density: A nuclear plant produces 1 GW in a small footprint vs hundreds of acres of solar.
- Carbon-Free: Meets corporate ESG and net-zero commitments.
- Grid Independence: SMRs can be co-located with data centers, avoiding transmission bottlenecks.
- Scalability: Modular design allows adding capacity incrementally.
Big Tech Nuclear Commitments
| Company | Partner(s) | Deal Details | Scale |
|---|
| Google | Kairos Power + TVA | PPA for Hermes 2 reactor, powering data centers in AL/TN2 | 50 MW |
| Amazon | X-Energy + Energy Northwest | SMRs in Washington State; MOU with Dominion Energy in VA3 | Multi-GW |
| Microsoft | Constellation Energy | $1.5B+ to restart Three Mile Island Unit 1 for data center power4 | 837 MW |
| Meta | Oklo + TerraPower | 1.2 GW nuclear campus in Pike County, OH. Multiple reactor types.5 | 1.2 GW |
| Switch | Oklo | 12 GW deployment of Aurora powerhouses over 20 years6 | 12 GW |
Total Big Tech nuclear investment: $10B+ announced across these deals, with deployment timelines from 2026-2035.
Competitive Landscape
| Company | Stage | Total Raised | Reactor Type | Key Backer | First Reactor |
|---|
| Aalo Atomics | Series B | $136M | Microreactor (XMR) | Valor Equity | 2026 |
| Kairos Power | Series B | $136M + $303M DOE | Molten Salt (KP-FHR) | Google/DOE | 2026 |
| Last Energy | Series C | $314M | Micro-PWR (20 MWe) | Astera Inst. | TBD |
| Radiant Nuclear | Series D | $525M+ | Portable Micro | a16z/Draper | 2026 |
| Crusoe Energy | Series E | $2B+ | N/A (power + DC) | Founders Fund | Operating |
| X-Energy | Late | $700M+ | HTGR (Xe-100) | Amazon | 2028 |
| Oklo (Public) | Public (NYSE: OKLO) | N/A | Fast Reactor | Sam Altman/Meta | 2027+ |
Green = recommended investment sweet spot (Series A-C, pre-IPO). Gray = later stage or public (included for reference).
Regulatory Environment
- NRC Fast-Tracking: NRC agreed to 18-month review timeline for X-Energy's Xe-100 construction permit — faster than historical 3-5 year timelines7
- DOE ARDP: Advanced Reactor Demonstration Program providing billions in cost-shared funding
- HALEU Fuel: DOE investing in domestic HALEU (high-assay low-enriched uranium) production — critical fuel for most advanced reactors
- Bipartisan Support: Nuclear has rare bipartisan political backing in current environment
- Iran War Impact: Oil above $100/barrel strengthens case for domestic nuclear energy independence
Investment Sweet Spot
Based on our investor criteria framework (pre-IPO, pre-Series D, government contracts, defensible technology, credible team):
Aalo Atomics★★★★★ Best Fit
Kairos Power★★★★★ Best Fit
Radiant Nuclear★★★ Good (Later Stage)
Crusoe Energy★★ Reference Only (IPO)
Top Picks: Aalo Atomics and Kairos Power are both Series B, ~$136M raised, with reactor demos in 2026 and major strategic partnerships. They represent the optimal risk/reward entry point for the AI data center power thesis.
1 IAEA / IEA estimates. 2 Kairos Power/Google/TVA, Aug 2025. 3 Amazon/Energy Northwest, 2024. 4 Microsoft/Constellation Energy, 2024. 5 AP News/Meta, Jan 2026. 6 Oklo/Switch, 2025. 7 NRC/X-Energy, 2025.