I just came across this thread, and found it really fascinating. I'd never heard of that particular plant.
In my limited experience, hydroelectric plants are good places to see old equipment, because most hydro sites were developed long ago.
An especially interesting aspect of these plants are the turbine governors, which are sometimes the original electro-mechanical-hydraulic units. These intricate servomechanisms provided precise speed regulation, controlling powerful hydraulic cylinders to operate the wicket gates.
