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Question
When will fusion energy be commercially available?
For Kronos: breeder (Hyperion) construction begins Q2 2027, the first unit comes online ~2030, and commercial burner fleets begin building in 2036.
The plan
Kronos publishes a dated, gated plan: open the physics in 2026, begin breeder (Hyperion) construction in Q2 2027, bring the first-of-a-kind unit online — first tritium — ~2030 (2031 conservative), build the first test burner from 2032, and begin commercial burner fleets in 2036. The integrated machines are not yet built.
2026
Open physics
Peer-review papers, open data, a live simulation — the design point solved and reproducible.
Q2 2027
Construction begins
Breeder (Hyperion) build starts; ~3.5 years to the first unit online (first tritium) ~2030.
2032 → 2036
Burner
First test burner built from 2032; commercial burner fleets — Aegis and MetroVolt — from 2036.
Related questions
More answers.
When will fusion energy be commercially available? +
Timelines vary by company. Kronos begins breeder (Hyperion) construction in Q2 2027, with the first unit online ~2030 (2031 conservative), the first test burner built from 2032, and commercial burner fleets from 2036, with the physics published openly in 2026.
Has Kronos built a fusion reactor yet? +
Not yet. Kronos is a conceptual design and simulation study; the integrated machines are not yet built. Every specification is a computed design target, published openly so anyone can check it.
What has to happen before the fleet? +
Chiefly, demonstrating the burner's requirement-class closure — an end-plug density that is specified but not yet demonstrated — plus advancing the breeding blanket. Kronos publishes these open gates.
Verify it yourself
Open by design.
Conceptual design and simulation study; the integrated Kronos machines are not yet built, and certain results are requirement-class. No financial figures are published on this site.