"In contrast, helium-3 is a completely clean source of energy. Two helium-3 atoms are fused in a thermonuclear reactor to produce normal helium and energy. The fuel is non-radioactive, the process produces no radioactivity, and the residue produces no radioactivity. It is the perfect energy source. However the helium-3 reaction takes place at 10 times the temperature of the TOKAMAK. It will probably take 10 to 20 years to work out the physics of containing the reaction."
https://www.nuenergy.org/helium-3-fusion-energy/
"For its part, the European Space Agency has signed a contract with several companies in order to study the future exploitation of lunar regolith resources to support an inhabited colony; in this case, helium-3 could be used to power a local reactor, or even as fuel for spacecraft powered by nuclear fusion."
https://www.bbvaopenmind.com/en/science/physics/helium-3-lunar-gold-fever/
"The idea of harvesting a clean and efficient form of energy from the Moon has stimulated science fiction and fact in recent decades. Unlike Earth, which is protected by its magnetic field, the Moon has been bombarded with large quantities of Helium-3 by the solar wind. It is thought that this isotope could provide safer nuclear energy in a fusion reactor, since it is not radioactive and would not produce dangerous waste products."
https://www.esa.int/Enabling_Support/Preparing_for_the_Future/Space_for_Earth/Energy/Helium-3_mining_on_the_lunar_surface
"Just eight tonnes of He-3 in fusion reactors would provide the equivalent energy of one billion tonnes of coal, burned in power stations."
http://www.spacesafetymagazine.com/space-on-earth/everyday-life/china-helium-3-program/
"Helium-3 (He3) is gas that has the potential to be used as a fuel in future nuclear fusion power plants. There is very little helium-3 available on the Earth. However, there are thought to be significant supplies on the Moon. Several governments have subsequently signalled their intention to go to the Moon to mine helium-3 as a fuel supply. Such plans may come to fruition within the next two to three decades and trigger a new Space Race."
https://explainingthefuture.com/helium3.html
"The unique atomic structure of helium-3 promised to make it possible to use it as fuel for nuclear fusion, the process that powers the sun, to generate vast amounts of electrical power without creating the troublesome radioactive byproducts produced in conventional nuclear reactors."
https://www.popularmechanics.com/space/moon-mars/a235/1283056/
"The fascination with helium-3 is as a fuel for fusion reactors. This fuel, it turns out, would produce absolutely no radioactive waste—unlike hydrogen-fueled fusion reactors which produce pesky neutrons that bombard components of the reactor and render them radioactive."
https://talkmarkets.com/content/commodities/another-extraordinary-delusion-mining-helium-from-the-moon?post=334424
"But there’s one race that’s completely off the general public’s radar: who will be the first to mine Helium-3 in space in significant quantities in order to try to develop nuclear fusion reactors that do not create hazardous nuclear waste and other pollutants.
“Outer space holds virtually limitless amounts of energy and raw materials, from Helium-3 fuel on the Moon for clean fusion reactors to heavy metals and volatile gases from asteroids, which can be harvested for use on Earth and in space,” says former CIA space analyst Tim Chrisman."
https://asiatimes.com/2021/11/helium-3-the-secret-mining-war-in-space/
"It is believed that the Moon has over one million tons of He-3 on its surface that can be extracted by heating the lunar dust to 600 degrees. A full Space Shuttle cargo bay could have fit 25 tons of He-3 and that could power the entire US for one year! Economists value He-3 at $3B/ton—more than enough to make it economically feasible to extract it from the Moon."
https://www.edn.com/helium-3-and-lunar-power-for-earth-reactors/