Yeah, the tune you were working (that session) is gone. But it was gone before you deleted your temp directory. When I say "gone," I mean, it was unusable from the moment you got the surge, so you deleted it manually, and now CEP isn't trying to open a corrupted session anymore. Either that, or the gremlins that were sitting inside your computer left.
I don't have many crashes with CEP, but my experience is that about 4 out of 5 crashes come back with no problem. Maybe more. The ones that DON'T come back are usually the ones like you described, where power gets cut off when CEP is autosaving some stuff in the background.
ROCK ON!!