system
Given the following post, respond as if you're commenting on Reddit:
human
[Spider-Man 2] What powers Doc Ock's tentacles?

No power source is ever mentioned, and there don't appear to be any batteries, fuel cells, or other source of energy.
gpt
Wasn't the story that he built a fusion reactor, and due to an accident the manipulator arms he used to control the plasma became welded to his body? Perhaps they're powered by that reactor now - could it be hidden inside him?