Marvel: 10 Most Underused Technologies In The MCU

10. Arc Reactors

The Arc reactor was invented by Howard Stark while studying the Tesseract after World War II and promised to provide cheap, clean, and renewable power to the world. However Howard was limited by the technology of his time and so entrusted his son, Tony Stark to one day complete the project.

Unfortunately, for years Tony preferred to shelf the idea in favour of manufacturing and selling weapons of war.

Eventually he was forced to perfect the Arc Reactor by inventing a new element in order to save his own life but even after this incredible breakthrough, the Arc Reactors, despite being able to supply the world with limitless clean energy, are used only to power Stark's own suits of armour and properties in New York and a handful of tech for his friends such as Spider-Man.

The rest of the world is still paying for power presumably. No explanation is ever given for why we don't see this tech all across the world by now.