ohhh boy, then start doing a cold backup now at least u will have
a fallback if u encounter more error afterwards.
I guess the system was writing on the first control file when the
power failed, so it was not able to sync in to the other control files.
You may try to startup mount and recover database.
But wait for davey and the other gurus they might have a better
solution but as far as my knowlegde is concerned, i guess this
will also what they will tell you
you have a slim chance of recovering your db since you don't have a backup.
Try to backup it up now b4 anything else, in case you commit mistake during recovery you got something to draw back.
Move one of the controlfile out, then try to copy one of the control file to the other and restart your db with mount option. If it does not work, copy the controlfile you have moved out to the 2 controlfiles. And restart the db again with mount option.
Notice the naming convention like control01, control02…