Newcleo is a nuclear energy company founded in September 2021 by Stefano Buono, Luciano Cinotti and Elisabeth Rizzotti, headquartered in Paris with operations across France, Italy, the United Kingdom, Switzerland, Belgium and Slovakia. It designs small modular lead-cooled fast reactors (LFR) fuelled with mixed oxide (MOX) fuel made from reprocessed spent nuclear fuel, with the aim of closing the nuclear fuel cycle and reducing long-lived waste. The group employs roughly 1,000 people, has raised over EUR 780 million, and has grown by acquisition (Hydromine Nuclear Energy, SRS-Fucina, Rutschi Group). Newcleo publishes no public developer API or developer program; its only public machine-consumable software is a small set of open-source scientific Python libraries released through its newcleo-dev-team GitHub organisation.
Newcleo is profiled on the APIs.io network. Tagged areas include Company, Energy, Nuclear Energy, Clean Energy, and Reactors.
Regulatory Posture applies to this provider. Its tags matched the
Energy & Utilities regime, so
Regulatory Posture carries 15 points of the composite.
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applicability map is public and we will correct it.
Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for
this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero:
never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and
several others — scorable at all.
The six quality facets above are damped to 85 points between them,
because the conditional facet above carries the other
15. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 85% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
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aid: newcleo
name: Newcleo
description: Newcleo is a nuclear energy company founded in September 2021 by Stefano Buono, Luciano Cinotti and Elisabeth
Rizzotti, headquartered in Paris with operations across France, Italy, the United Kingdom, Switzerland, Belgium and Slovakia.
It designs small modular lead-cooled fast reactors (LFR) fuelled with mixed oxide (MOX) fuel made from reprocessed spent
nuclear fuel, with the aim of closing the nuclear fuel cycle and reducing long-lived waste. The group employs roughly 1,000
people, has raised over EUR 780 million, and has grown by acquisition (Hydromine Nuclear Energy, SRS-Fucina, Rutschi Group).
Newcleo publishes no public developer API or developer program; its only public machine-consumable software is a small set
of open-source scientific Python libraries released through its newcleo-dev-team GitHub organisation.
deliveryModel:
model: library
open_source: false
commercial: false
callable_host: false
label: Library · distributed through package registries, no callable service
confidence: low
source:
- none
generated: '2026-08-28'
method: derived
accessModel:
pricing: unknown
onboarding: unknown
trial: false
try_now: false
public: false
label: Unknown
confidence: low
source:
- security
generated: '2026-09-02'
method: derived
image: https://avatars.githubusercontent.com/u/113201176?v=4
url: https://raw.githubusercontent.com/api-evangelist/newcleo/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: stub
x-tier-reason: harvest
specificationVersion: '0.23'
created: '2026-08-04'
modified: '2026-08-04'
tags:
- Company
- Energy
- Nuclear Energy
- Clean Energy
- Reactors
- Deep Tech
- Manufacturing
- Open-Source
- Scientific Computing
tags_raw:
- Company
- Energy
- Nuclear Energy
- Clean Energy
- Reactors
- Deep Tech
- Manufacturing
- Open Source
- Scientific Computing
apis: []
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
- FN: APIs.json
email: info@apis.io
common:
- type: Website
url: https://www.newcleo.com
- type: GitHubOrganization
url: https://github.com/newcleo-dev-team
- type: Packages
url: packages/newcleo-packages.yml
- type: LLMsTxt
url: llms/newcleo-llms.txt
- type: DomainSecurity
url: security/newcleo-domain-security.yml
- type: SecondaryMarket
url: https://www.hiive.com/securities/newcleo-stock
x-enrichment:
date: '2026-08-04'
status: minimal
artifacts_added: 3
pass: local-v1
x-coverage:
state: none
reason: not-a-software-company
detail: 'Newcleo builds physical lead-cooled fast reactors and MOX fuel, not software products: www.newcleo.com is a 354-byte
React shell that returns HTTP 404 with the same empty body for every sub-path and pulls all content client-side from a
private Azure API Management Contentful proxy, and the only APIM routes referenced in its JavaScript bundle are website
form handlers (contact-us, investor, supply-chain, user-admin) gated behind an Ocp-Apim-Subscription-Key, with no developer
portal, no docs host, and no published specification anywhere.'
evidence:
- url: https://www.newcleo.com/
status: 200
- url: https://www.newcleo.com/our-technology/
status: 404
- url: https://newcleo-web-apim-prod.azure-api.net/contentful
status: 404
- url: https://newcleo-web-apim-prod.azure-api.net/newcleo-func-production/contact-us
status: 404
- url: https://www.newcleo.com/.well-known/agent-card.json
status: 404
- url: https://www.newcleo.com/llms.txt
status: 404
- url: https://github.com/newcleo-dev-team
status: 200
checked: '2026-08-04'
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