The Power House contained steam engines to generate electricity for the Bonville's Court Colliery (nprn 308432) and may also have contained pumping equipment. It originally had a hipped roof, but was reduced to a smaller building at the turn of the century: one half having a gabled slate roof added, and the other a monopitch corrugated roof. The whole building is of coursed sandstone rubble. There are several semi-circular brick arches now blocked to the W and E elevations. The gabled section has two sash windows to the N elevation, each three panes by seven, and a large brick arch to the E originally for access by wagons. The bearing for a machine drive through the wall can be seen at the SW corner of the structure.
Source:- Cadw listed buildings
N J Roberts, RCAHMW, 12/11/2007.