Santa Catalina Island has its own power generation. It's not linked to the mainland.
It's a 30 mile trek across the Channel, at depths to 2500 ft or so.

The original Catalina generator (which might have been the very one that originally powered the theatre) is now in a static (very) display at the Antique Gas and Steam Engine Museum in Vista, CA.

Slick, this is way cool! Thanks for all the pics and info!!

The absolutely amazing thing about this is that it is all a stone's throw from the Ocean, and has withstood 75 years of the highly corrosive salt air.

For those of you that might not recognize the location, it's in the Avalon Casino, which was shown at the beginning of the Fantasy Island TV series (right before Tattoo yelled "Da Plane, Da Plane")