Most plausible Psionic powers?

[ericthered]

Originally Posted by malloyd

The thing is, that observation is *correct* - the sun can't run on a chemical reaction and be billions of years old. In order for a psi power to do something that requires more energy than a human can generate, it has to tap an external source of power, at which point it's not a psi power, it's some other kind of power.

is it? I'm no expert, but does psi specify that the energy comes from the person's body?