I haven’t seen any direct evidence, but I have heard conspiracies about possibly government owned ufos that don’t seem to have any exhaust holes, which could point to a different energy source than we are familiar with. Would be huge if true.
I do agree that said new energy source could seriously boost human productivity, but I don’t think it would be a silver bullet for debt. I believe our debt stems from human nature’s darker side of fear and corruption.
Technology has already increased human productivity exponentially, sadly debt seems to have a positive correlation with productivity.
Things still get more expensive as we get more productive because it’s almost used as an excuse to steal more from the people.