The Future of Nuclear Fusion
Fusion has been demonstrated in the laboratory, including a 2022 experiment that released more energy from the fuel than the laser energy delivered to it. No facility yet produces net electricity, and schedules for the first plants remain uncertain.
Last meaningful change Oct 13, 2026, 11:00 AM · 5 milestones · 2 updates · 2 articles
Where the story stands
Fusion has been demonstrated in the laboratory, including a 2022 experiment that released more energy from the fuel than the laser energy delivered to it. No facility yet produces net electricity, and schedules for the first plants remain uncertain.
Background
Fusion powers the sun by forcing light atomic nuclei together. On Earth, two broad approaches exist: magnetic confinement, in which hot plasma is held in a doughnut-shaped tokamak or a twisted stellarator, and inertial confinement, in which lasers compress a tiny fuel capsule. Both have made measurable progress, and private companies now pursue variants of each. The engineering gap between a scientific result and a power plant that runs for years is the central uncertainty.
Timeline of developments
Documented milestones are dated and sourced. Items marked illustrative belong to the demonstration scenario.
· Origin
Tokamak concept developed
Soviet physicists develop the tokamak, a magnetic bottle that becomes the dominant design for confining fusion plasma.
· Milestone
JET sets a fusion power record
The Joint European Torus in the United Kingdom produces about 16 megawatts of fusion power, a record that stood for decades.
Source: EUROfusion: JET
· Turning point
Ignition at the National Ignition Facility
Lasers deliver 2.05 megajoules to a fuel capsule, which releases 3.15 megajoules of fusion energy. It is the first laboratory demonstration of fusion energy gain from the target.
· Milestone
ITER announces a revised schedule
The ITER project presents a new baseline that moves the start of research operations to 2034, with full deuterium-tritium operation planned for 2039.
Source: ITER Organization
· Milestone · Illustrative
Pilot plant site selected (illustrative)
In this demonstration scenario, a consortium names a site for a pilot plant intended to deliver electricity to the grid in the 2030s.
Recent meaningful changes
Each entry says what actually changed, not a rewritten summary.
- New developmentMajor
Consortium names a pilot plant site
Illustrative: A public-private consortium announced the location of a pilot fusion plant. The announcement includes a timeline but no independent engineering review.
Read: Consortium Names Site for Pilot Fusion Plant - Resolved question
Repeat ignition shots confirm 2022 result was not a fluke
Illustrative summary of a real pattern: following the December 2022 shot, the National Ignition Facility reported further experiments exceeding target gain, answering the question of whether the result could be reproduced.
Coverage
Fusion Energy: What Has Actually Been Demonstrated
Ignition has happened. Net electricity has not. A guide to separating the physics results from the press releases.
2 min read
Consortium Names Site for Pilot Fusion Plant
1 min read
Forecasts made about this story, revisited as evidence arrives.
- Open
A fusion pilot plant will deliver electricity to a grid before 2035.
Several private fusion companies (public statements, 2021–2024) · made Jan 1, 2023 · horizon 2035
Source: Company statements; see Fusion Industry Association reports
- Revised
ITER will achieve first plasma in 2025.
ITER Organization (2016 baseline schedule) · made Nov 16, 2016 · horizon 2025
Outcome (Jul 3, 2024): In July 2024 ITER presented a new baseline moving the start of research operations to 2034 and full deuterium-tritium operation to 2039.
Source: ITER Organization