Fusion Q&A
How close is fusion energy?
Short answer
The first commercial fusion power plants are expected between 2030 and 2040. Commonwealth Fusion's ARC and Helion's Polaris-7 are both targeting grid power in the early 2030s; ITER will not produce electricity but validates the physics for utility-scale fusion in the late 2030s.
What ignition meant
In December 2022, the National Ignition Facility at Lawrence Livermore became the first device to release more fusion energy than the lasers deposited — the milestone called ignition, or Q > 1. This proved the physics. It did not produce a power plant.
The gap between ignition and grid power is engineering, not physics: pulse rate, magnet durability, tritium breeding, materials lifetime, and economics.
The credible commercial timelines
Commonwealth Fusion's SPARC tokamak targets first plasma in 2027 and Q > 2; ARC, its commercial follow-on, targets 400 MWe in the early 2030s.
Helion Energy has signed a power purchase agreement with Microsoft for 50 MW by 2028 — the first commercial fusion PPA in history.
ITER will produce its first plasma in 2034 and full deuterium-tritium operations in 2039, demonstrating Q = 10 at reactor scale.
Frequently asked
- Has fusion produced more energy than it consumed?
- Yes — NIF achieved ignition (Q > 1) in December 2022 and has repeated it multiple times since.
- When will fusion be on the grid?
- The earliest credible commercial fusion electricity is Helion's 2028 Microsoft PPA; broader commercial deployment is expected 2030–2040.
- Is fusion already commercial?
- No. The technology is in the late R&D and early demonstration stage. No fusion electricity has been sold commercially yet.
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