TerraPower

TerraPower is a Bellevue, Washington-based advanced nuclear innovation company founded in 2006 with Bill Gates as founder and chair. Its flagship product is the Natrium reactor, a 345 MWe sodium-cooled fast reactor co-developed with GE Vernova Hitachi Nuclear Energy and paired with an integrated molten salt energy storage system that can boost output to 500 MWe for up to five-plus hours to follow renewable grid load. TerraPower broke ground in 2024 on the first commercial Natrium demonstration plant in Kemmerer, Wyoming under the U.S. Department of Energy's Advanced Reactor Demonstration Program (ARDP), a 50/50 cost-share with up to $2 billion in federal funding. The company's second business line, TerraPower Isotopes (TPI), produces research-grade actinium-225 — an alpha-emitting radionuclide used in targeted alpha therapy for cancer — from DOE thorium-229 stockpiles in partnership with Isotek, with a lab in Everett WA and a cGMP manufacturing facility under construction in Philadelphia's Bellwether District. TerraPower has no commercial developer API, SDK, or public partner integration platform; its revenue model is reactor sales, plant operation, and isotope supply contracts with pharmaceutical partners including Aktis Oncology, Advanced Accelerator Applications, Cardinal Health, and Point Biopharma. The company does maintain a meaningful open-source nuclear engineering footprint on GitHub — most notably ARMI (Advanced Reactor Modeling Interface), an Apache 2.0 Python framework for nuclear reactor design and analysis automation used internally to design Natrium and made available to the wider reactor engineering community.

TerraPower is profiled on the APIs.io network. Tagged areas include Nuclear, Advanced Nuclear, Reactors, Sodium-Cooled Fast Reactor, and Natrium.

TerraPower’s developer surface includes product news, GitHub presence, YouTube channel, engineering blog, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub

7.9/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

NuclearAdvanced NuclearReactorsSodium-Cooled Fast ReactorNatriumSmall Modular ReactorsEnergy StorageMolten SaltClean EnergyMedical IsotopesActinium-225Targeted Alpha TherapyCancer TreatmentReactor DesignOpen Source

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 7.9/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.4 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 0.7 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/terrapower: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Documentation 1

Reference material describing how the API behaves

ARMIDocumentation

ARMIDocumentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Learn 1

Tutorials, courses, talks, and written guidance

YouTube

YouTube

Operate 2

Status, limits, changes, and where to get help

NatriumFAQ

NatriumFAQ

Contact

Contact

Company 6

The organization behind the API

Website

Website

News

News

Careers

Careers

LinkedIn

Twitter

Twitter

Blog

Blog

Other 6

Properties that don't map to a standard resource type

Natrium

Isotopes

Wyoming

Future

Suppliers

ARMI

Source (apis.yml)

aid: terrapower
name: TerraPower
description: TerraPower is a Bellevue, Washington-based advanced nuclear innovation company founded in 2006 with Bill Gates
  as founder and chair. Its flagship product is the Natrium reactor, a 345 MWe sodium-cooled fast reactor co-developed with
  GE Vernova Hitachi Nuclear Energy and paired with an integrated molten salt energy storage system that can boost output
  to 500 MWe for up to five-plus hours to follow renewable grid load. TerraPower broke ground in 2024 on the first commercial
  Natrium demonstration plant in Kemmerer, Wyoming under the U.S. Department of Energy's Advanced Reactor Demonstration Program
  (ARDP), a 50/50 cost-share with up to $2 billion in federal funding. The company's second business line, TerraPower Isotopes
  (TPI), produces research-grade actinium-225 — an alpha-emitting radionuclide used in targeted alpha therapy for cancer —
  from DOE thorium-229 stockpiles in partnership with Isotek, with a lab in Everett WA and a cGMP manufacturing facility under
  construction in Philadelphia's Bellwether District. TerraPower has no commercial developer API, SDK, or public partner integration
  platform; its revenue model is reactor sales, plant operation, and isotope supply contracts with pharmaceutical partners
  including Aktis Oncology, Advanced Accelerator Applications, Cardinal Health, and Point Biopharma. The company does maintain
  a meaningful open-source nuclear engineering footprint on GitHub — most notably ARMI (Advanced Reactor Modeling Interface),
  an Apache 2.0 Python framework for nuclear reactor design and analysis automation used internally to design Natrium and
  made available to the wider reactor engineering community.
type: Index
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
position: Provider
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/terrapower.png
tags:
- Nuclear
- Advanced Nuclear
- Reactors
- Sodium-Cooled Fast Reactor
- Natrium
- Small Modular Reactors
- Energy Storage
- Molten Salt
- Clean Energy
- Medical Isotopes
- Actinium-225
- Targeted Alpha Therapy
- Cancer Treatment
- Reactor Design
- Open Source
url: https://raw.githubusercontent.com/api-evangelist/terrapower/refs/heads/main/apis.yml
created: '2026-05-24'
modified: '2026-05-24'
specificationVersion: '0.20'
apis: []
common:
- type: DomainSecurity
  url: security/terrapower-domain-security.yml
- type: Website
  url: https://www.terrapower.com
- type: Natrium
  url: https://www.terrapower.com/natrium/
- type: Isotopes
  url: https://www.terrapower.com/isotopes/
- type: Wyoming
  url: https://www.terrapower.com/wyoming/
- type: NatriumFAQ
  url: https://www.terrapower.com/natrium-faq/
- type: Future
  url: https://www.terrapower.com/future/
- type: News
  url: https://www.terrapower.com/news/
- type: Suppliers
  url: https://www.terrapower.com/suppliers/
- type: Careers
  url: https://www.terrapower.com/careers/
- type: Contact
  url: https://www.terrapower.com/contact/
- type: GitHub
  url: https://github.com/terrapower
- type: ARMI
  url: https://github.com/terrapower/armi
- type: ARMIDocumentation
  url: https://terrapower.github.io/armi/
- type: LinkedIn
  url: https://www.linkedin.com/company/terrapower
- type: Twitter
  url: https://twitter.com/TerraPower
- type: YouTube
  url: https://www.youtube.com/@TerraPowerLLC
- type: Blog
  url: https://www.terrapower.com/news/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com