Stellaris is Proxima Fusion's design for the first commercial stellarator fusion power plant, planned on RWE's decommissioning Gundremmingen nuclear site in Bavaria and targeted to deliver power in the 2030s after the Alpha demonstrator.

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Current state

Status	Design
Country	Germany
Location	Gundremmingen, Bavaria
Developer	Proxima Fusion
Developer type	Private
Concept	Stellarator
Fuel	D-T
Purpose	Commercial plant
Site	RWE's former Gundremmingen nuclear plant identified under 2026 MoU
Private funding raised	EUR 650m (as of 2026-07-07)
Public funding	Bavaria up to €400m; possible 20% state co-financing subject to federal funding

Notes

Grid target given only as 'the 2030s'; power rating not confirmed in the sources reviewed. RWE is a partner, not a contracted offtaker.

Timeline

2026-03-03 — Proxima, RWE, Bavaria and IPP signed an MoU naming RWE's Gundremmingen site for the first stellarator power plant. (source)
2026-07-07 — RWE joined Proxima's €411 million round as a strategic investor and partner for the Gundremmingen plant. (source)

The timeline is append-only: corrections are added as new entries. Stated targets appear in the current-state table, never as milestones.

Related projects

Alpha (Proxima Fusion) Design · Germany
Eos (Thea Energy) Design · United States
Focused Energy laser fusion plant (Biblis) Concept · Germany
GIGA (Gauss Fusion) Design · Germany
Helix HARUKA (Helical Fusion) Under construction · Japan
Infinity One (Type One Energy) Licensing · United States
Infinity Two (Type One Energy / TVA) Licensing · United States
Wendelstein 7-X Operating · Germany

See all 51 projects in the Fusion Energy Companies & Projects Tracker →

Sources

Stellaris — Proxima Fusion (primary), checked 2026-10-11
Proxima Fusion signs MOU with Bavaria, RWE, and Max Planck IPP — ANS Nuclear Newswire, checked 2026-10-11
Largest European fusion investment on record sees Proxima Fusion raise €411 million — EU-Startups, checked 2026-10-11