The company I worked for had many streamflow units, still online, and many dating from the very early twentieth century. I believe a few may still be in use, but since "de-regulation", the company had to sell off all of it's generation because of the conflict of interest, and the purchasers found that the things were too costly to operate as prime generation units, so shut them down, and most likely, scrapped them; I can't be sure, because that all came about after I retired.. Parts were almost nonexistent, though, except for the stock that came from owning and operating them since their origin.
A related anecdote: In 1968, my crew retired the last remaining 480 volt Primary commercial distribution system still in operation in our service area, and converted service to 12KV primary. This system had been in service since 191?. These types of systems were very common in the early days of AC distribution.