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# ArianeGroup fires reusable Prometheus engine four times in a day
- URL: https://sovereigntymonitor.eu/news/2025-07-02-arianegroup-prometheus-engine-test/
- Published: 2025-07-02T12:00:00.000Z
- Updated: 2026-10-19T16:00:21.000Z
- Description: ArianeGroup fired its reusable Prometheus engine four times in one day on the Themis T1G demonstrator at Vernon, France. The multi ignition feat is described as unique in Europe, a step toward a reusable launcher.
- Author: Reidar Balstad
- Tags: Defence and space, #news, #reported, #editor-read

Reported Editor-read [European Spaceflight, 2 July 2025](https://europeanspaceflight.com/arianegroup-completes-key-prometheus-rocket-engine-tests/?ref=sovereigntymonitor.eu)

**What it does not test.** It does not establish that Prometheus will fly on an operational European launcher or when.

**How this item counts.** This item is dated before the index starts on 1 January 2026, so it does not count in the [European Sovereignty Index](https://sovereigntymonitor.eu/sovereignty-index/).

**How this item was made.** Drafted by an AI system (Claude (Anthropic)) from the source cited above; read and approved by the editor on 2026-10-19\. [How the record is made](https://sovereigntymonitor.eu/method/#how-the-record-is-made)