Up to 75 percent less energy for fusion ignition! A scientist from Peru has calculated a new path with two colleagues that could advance research into future fusion power plants. But does this spectacular idea hold up to practical testing?
Millions of people are pinning their hopes on an energy source that could provide enormous amounts of electricity without releasing CO₂ during the fusion process itself. However, for decades, scientists have been struggling with the same problem: controlled nuclear fusion requires extreme temperatures and complex technology.
Now, Peruvian physicist Luis Felipe Delgado-Aparicio is attracting attention with a new research approach. Together with Masayuki Ono and Jonathan Menard at the Princeton Plasma Physics Laboratory, he is investigating how a fusion reaction could be ignited with less energy. The idea: do not heat the entire fuel supply immediately, but start with a smaller amount and add more fuel subsequently.
THE MAN BEHIND THE IDEA COMES FROM PERU
Delgado-Aparicio began his scientific career at the Pontificia Universidad Católica del Perú in Lima. Today, he conducts research in the USA at the Princeton Plasma Physics Laboratory. Together with his two colleagues, he published a study in the journal Physical Review Letters in September 2026.
The central question of their work: how can the point be reached at which a fusion reaction generates enough energy to sustain itself? To this end, the researchers combined established physical models and investigated the influence of the sequence of heating and fuel injection on ignition.
Other Peruvian research projects also deal with extraordinary questions. Our PeruMagazin Informs news section offers an insight into current scientific topics.
100 MILLION DEGREES – AND STILL NOT ENOUGH!
The problem of nuclear fusion is immense. For light atomic nuclei to fuse, they must overcome their mutual electrical repulsion. To achieve this, researchers heat the fuel to temperatures of more than 100 million degrees Celsius.
At this heat, plasma is created. In so-called tokamak reactors, powerful magnetic fields keep the extremely hot matter away from the reactor walls. But even these temperatures do not guarantee success. The plasma must be hot and dense enough and remain confined for long enough. At the same time, it is constantly losing energy through radiation and other physical processes.
The decisive challenge: the fusion reaction must generate enough energy to compensate for these losses.
THE TRICK: LESS FUEL FIRST, THEN MORE!
This is exactly where the new approach comes in. The researchers are investigating a method in which a smaller amount of plasma is first brought to the required temperature. Further fuel could only be added gradually afterward.
Anyone who only has to heat less fuel at the start might require significantly less energy to overcome the difficult initial phase. The scientists have calculated how temperature, density, and energy losses develop during this process. Their results show that it is not only the final conditions in the reactor that are important. The path taken to reach them could also determine how much energy is required for ignition.
75 PERCENT LESS ENERGY? THE STORY BEHIND THE FIGURE
75%
Less energy could theoretically be possible.
The figure refers to the energy expenditure for fusion ignition – not the total power consumption of a power plant.
In an interview with his former university, Delgado-Aparicio explained that, under certain conditions, the energy requirement could potentially be reduced to a quarter. This would be a significant step forward. However, the figure comes from theoretical calculations. This saving has not yet been proven in a real fusion reactor.
Whether the advantages can be achieved depends on how precisely the plasma can be heated and additional fuel can be introduced. The stability of the plasma and the unavoidable energy losses also play a crucial role.
THE NEXT SURPRISE: NO COMPLETELY NEW REACTOR NEEDED?
The new approach could also be interesting for fusion facilities that have already been developed. The researchers do not necessarily want to build an entirely new type of reactor. Instead, they are investigating whether ignition can be improved by controlling the plasma differently.
This could save development costs. However, this is conditional on the calculations being confirmed in existing experimental facilities. At temperatures of more than 100 million degrees, scientists must keep the plasma stable, limit energy losses, and introduce additional fuel at the right time. A mistake in control can lead to the plasma cooling down and the fusion reaction breaking off.
POWER LIKE THE SUN – WHY DOES IT TAKE SO LONG?
Nuclear fusion promises enormous amounts of energy. Its principle also powers our sun: light atomic nuclei fuse and release energy in the process. On Earth, however, this process is incomparably more difficult to control.
There are also other problems. Reactor components must withstand enormous loads. The required fuel, tritium, is scarce and would have to be produced within future plants themselves. In addition, the released energy must be converted into usable electricity.
While research into nuclear fusion is being conducted worldwide, Peru currently relies on natural gas, among other sources, for its energy supply. Our article Gas from Piura: New Opportunities for Northern Peru shows which projects are planned in the north.
Despite decades of research, there is still no commercial fusion power plant that supplies electricity to the public grid on a permanent basis.
NOW THE PRACTICAL TEST IS NEEDED!
For Delgado-Aparicio and his colleagues, the publication is only the beginning. Their calculations show a possible path to more efficient fusion ignition. Whether this path also works in a real plant must be clarified by further experiments.
If the proof is successful, the method could influence the development of future fusion reactors. If it fails, the calculations will remain a contribution to a better understanding of physical boundaries.
WILL THE CALCULATION BECOME A BREAKTHROUGH?
A Peruvian physicist and his colleagues have presented a new approach to one of the biggest problems in energy research. Now, experiments must show whether the hoped-for energy savings can actually be achieved.
For Peru, the study is also an example of the international work of Peruvian scientists. From his studies in Lima, Delgado-Aparicio's path led to an important American nuclear fusion laboratory. Another recent study shows the diversity of research involving Peru: Potato shock from Peru: What researchers found in the DNA.
Delgado-Aparicio's research could one day help to harness an energy source that scientists around the world have been working on for decades.
Sources
Delgado-Aparicio, L. F.; Ono, M.; Menard, J. E. (2026): "Generalized Lawson-Cordey-Mills Accessibility of Fusion Ignition". Physical Review Letters, September 2026.
Pontificia Universidad Católica del Perú (2026): Interview with Luis Felipe Delgado-Aparicio. PuntoEdu, September 2026.
Image source: U.S. Department of Energy / Princeton Plasma Physics Laboratory: National Spherical Torus Experiment Upgrade (NSTX-U), via Wikimedia Commons, public domain. Archive photo; not an illustration of the described study.
