Only way I know of is if you have e.g. a RAID controller with a battery-backed write cache. Even that may not be 100% reliable but it's the closest I know of. Of course that's not a software solution at all.
That's uh, not running out of power in the middle of the write. That's having extra special backup power to finish the write. If your battery dies mid cache-write-out, you're still screwed.
