Event / publication / experimentBranchesDecember 5, 2022

Fusion energy and ignition

Lawrence Livermore National Laboratory (NIF)CEA (WEST)IPP (Wendelstein 7-X)

This page delivers no verdict; it presents claims and evidence with their sources. No theory in science is absolute. Method

For everyone

The Sun's energy comes from the joining of light nuclei (fusion). On 5 December 2022 the US National Ignition Facility (NIF) reached "ignition" for the first time, getting more fusion energy out than the laser energy delivered to the fuel. In April 2025 this ratio exceeded four. However, the total electricity drawn by the lasers is still far larger, and there is no commercial fusion power plant yet.

For specialists

At NIF, 2.05 MJ of laser energy produced 3.15 MJ of fusion yield (target gain about 1.5). The shot of 7 April 2025 produced 8.6 MJ from 2.08 MJ (target gain about 4.13). Counting the total energy drawn from the wall plug, the gain is far below 1. In magnetic confinement, the WEST tokamak set a plasma-duration record of 1,337 seconds in February 2025, and the Wendelstein 7-X stellarator held a record triple product for long discharges for 43 seconds in May 2025.

Claims

An inertial-confinement fusion experiment has produced more fusion energy than was delivered to the target.^[1][2]

Evidence

Supporting

Measurement

Neutron-yield measurements showed 3.15 MJ of fusion energy in the 5 December 2022 shot.^[1]

Measurement

In long plasmas, WEST sustained a plasma for 22 minutes, and Wendelstein 7-X sustained high performance for 43 seconds.^[4][5]

Challenging

Methodological critique

NIF's lasers draw about 300 MJ of electricity from the grid per shot; counting this, there is no net energy gain. The facility was designed to demonstrate scientific breakeven, not energy efficiency.^[3]

Open questions

When will fusion deliver net electricity to the grid? The target dates of ITER and private ventures have often slipped.

Connections

Parent

Energy

Cold fusion (low-energy nuclear reactions)

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Sources

ArticleAbu-Shawareb, H. et al. (Indirect Drive ICF Collaboration) (2024). Achievement of target gain larger than unity in an inertial fusion experiment. Physical Review Letters 132, 065102DOI 10.1103/PhysRevLett.132.065102 archive
Web (2025). Target breakthrough enabled fusion record at NIF. Lawrence Livermore National Laboratorylasers.llnl.gov archive
WebNIF frequently asked questions. Lawrence Livermore National Laboratorylasers.llnl.gov archive
Web (2025). WEST sets a new plasma duration record. CEA-IRFMirfm.cea.fr archive
Web (2025). New performance records at Wendelstein 7-X. Max-Planck-Institut für Plasmaphysikipp.mpg.de archive

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Cite this page

APA

Athena contributors. (2026). Fusion energy and ignition. Athena: The tree of human knowledge. Retrieved November 1, 2026, from https://latifkedi.github.io/athena/en/d/fuzyon/

BibTeX

@misc{athena_fuzyon,
  title        = {Fusion energy and ignition},
  author       = {{Athena contributors}},
  year         = {2026},
  howpublished = {\url{https://latifkedi.github.io/athena/en/d/fuzyon/}},
  note         = {Athena: The tree of human knowledge. Accessed: 2026-11-01}
}

Added: September 27, 2026 · Last changed: September 27, 2026 · Page history

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