Hey @caveman75, Welcome to the Local Community Forums!
It’s hard to say why the site went away, but a power outage could definitely cause a corruption within the database.
Can you try restoring the site to a new one in Local? You can use a backup of the site, or try using the files for the site by following the steps outlined in the “Restoring From Only Local Site files” section of this help doc:
If you still have issues, can you please provide your Local Log? See this Community Forum post for instructions on how to do so: