# Commonwealth Fusion Systems

**Canonical:** https://apis.io/providers/commonwealth-fusion-systems/  
**Website:** https://cfs.energy  
**APIs profiled:** 0

Commonwealth Fusion Systems (CFS) is a commercial fusion energy company headquartered in Devens, Massachusetts and spun out of the MIT Plasma Science and Fusion Center in 2018. CFS is developing tokamak-based fusion systems built around high-temperature superconducting (HTS) REBCO magnet technology that enables substantially smaller, faster, and lower-cost fusion machines than prior generations. The company's technology pipeline starts with SPARC, a net-energy demonstration tokamak under construction at the Devens campus, and continues with ARC, the planned first commercial fusion power plant, sited in Chesterfield County, Virginia in partnership with Dominion Energy and targeted to deliver approximately 400 MW of electricity to the grid in the early 2030s. CFS is backed by a deep investor base including Breakthrough Energy Ventures, Eni, Equinor, Google, Temasek, Tiger Global, Khosla Ventures, Bill Gates, Soros Fund Management, Lowercase Capital, John Doerr, and TIME Ventures. CFS does not publish a public developer API or SDK; engagement is via partnerships, careers, and investor channels.

## Kin Score — 6.7 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 6.7).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 2.4 |
| Commercial Clarity | 10.5 |
| Access Clarity | 10.5 |

Regulatory layer — **Energy & Utilities**: 13.5 (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)

- **Commonwealth Fusion Systems Domain Security** — TLSv1.3 · DNSSEC · DMARC

## Tags

Fusion Energy, Tokamak, SPARC, Arc, HTS Magnets, High-Temperature Superconductors, REBCO, Clean Energy, MIT, Devens, Chesterfield County, Dominion Energy

---

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