It’s amazing what you can find on ebay, like this postcard of an electric power plant near Kapowsin.
This particular powerhouse, I believe, was the Electron powerhouse, which went into operation June 26, 1904.
The “The two-story building, (right) was a residence and clubhouse. The machine shop is in the foreground.” (In the Shadow of the Mountain)
For loads of information about this plant and information about Kapowsin, definitely check out Andy Anderson’s book In the Shadow of the Mountain.
Images courtesy of Diane Mettler.
Click on images to enlarge.