The Librarian wrote:
I like that they have the alternative power source as well, not just because it shows they have more advanced science in a particular area but because it acknowledges that antimatter isn't the only potential power source. It might also say something about their respective design philosophies depending on exactly how the singularity system works, ie do you have to feed it fuel or is it more like a nuclear reactor where the whole thing gets swapped out every ten years.
TROI: The Romulans use an artificial quantum singularity as their power source. Once it's activated, it can't be shut down.
It doesn't look like it gets swapped out periodically.