Here's a general view of the 1.6 MW power house and dam, built between 1907 and 1920. You can see the hog livers on the south side of the power house. Although they are no longer in service, they were not removed.

There are three generations of insulators in these pictures: the conduit, pothead, and hog liver insulators on the south side, abandoned wall tubes on the east side, and wall tubes and protectors in use on the west side.

I'm thinking that these guys at one time fed the output of the alternators through switchgear, then directly from the busbars to the conduit and hog livers. As they upgraded their transmission voltage, they added transformers inside the power house and replaced the insulation.