RTG

not to be confused with the QT-RTG.
The RTG, or Radioisotope Thermoelectric Generator, is a power generation item in Astroneer that supplies a constant stream of power.

Source
RTGs can also very rarely found in wrecks that feature a broken or  in them, which themselves are also very rare.

Uses
RTGs can be placed on platforms to provide a steady stream of power at all times.

Shelters and Field Shelters have low-power RTGs built-in, which cannot be removed. They provide 1U/s and 0.5U/s, respectively.

Trivia

 * If one purchases all materials for crafting exclusively from a Trade Platform and has already obtained all of the required gasses and processing machines beforehand with one Graphite and Hematite left over, the actual Scrap cost of a single RTG is only 12 Scrap. However, the Scrap return from shredding an RTG in a Large or Extra Large Shredder is only 4 Scrap.
 * The RTG is based on a real life power generator that has been used in space exploration. RTGs in this game do not expire, although RTGs in real life can feel like they don't expire; they can last for several decades and possibly even centuries before their power output becomes too low.

Media
RTG RTG GTR 同位素热电式发电机