This is the building where we began a detailed archeological study.
We were able to obtain a photo of this building from the Hagley Museum, and we took rough measurement of what remains of the foundation on site.
The photo is from 1903 during the operational period of the mill.
 

The Power House is located below the Lower Falls.  Parts of a four foot diameter steel pipe running from the lower falls to the power house still remain.
Another old photo of the lower falls from the Hagley Museum shows a wooden raceway where the steel pipe now lies.

The power house appears to be two buildings adjoined. We suspect that the power house generators were first water powdered then later converted to steam power.
The 1903 power house photo makes reference to the wheel pit. The wheel pit still exists, but in the 1903 photo it appears to be filled in.

Looking at the floor plan of the power house, the part of the building with the wheel pit probably held the generators.
Remains of a concrete pad still exist in this building with steel anchor bolts protruding.

The second part of the building has remains of a smoke stack. This leads us to believe that maybe this section was added on to house boilers for the transition to steam power.