# TerraPower

**Canonical:** https://apis.io/providers/terrapower/  
**Website:** https://www.terrapower.com  
**APIs profiled:** 0

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.

## Kin Score — 4.5 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 4.5).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 2.4 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

Regulatory layer — **Energy & Utilities**: 8.1 (matched via tags).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (1)

- **Terrapower Domain Security** — TLSv1.3 · DMARC

## 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

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/terrapower/). Scores are computed from the provider's own public artifacts under a published rubric.