What happens with the Guest OS's on ESXi in the event of a power failure? [closed]

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http://serverfault.com – It seems like this question should be answered easily, but my google-fu may not be up to snuff. I am a hobbyist ESXi user/ freelance developer/ systems engineer. I don't have my ESXi server on a UPS. If I am away from home, and my house experiences a power outage, the ESXi server is set to come back on automatically when power is restored. What happens with the guest OS's? Ideally I would like them to all come online again as well, assuming they were on when power was lost, but I see no option for choosing this. I don't want to yank power to the system just to try it out, of course. I'm (HowTos)