Cwm Dyli Power Station

Large rectangular hydro-electric turbine house conceived in a bold alpine arts-and crafts style, appropriate to its mountainous setting. Of quarry-dressed limestone construction on a slightly-battered base and with brown brick and tooled limestone dressings. Renewed slate roofs with tiled ridges and oversailing eaves; plain bargeboards with deep verges. The building is of one tall storey with a large pitched roof hipped at the narrow ends to either side of a large central gable; these gables accommodate tall round-arched windows, the upper sections of which break the eaves. The long sides are of 7 bays and these and the ends both have broad lacing courses of brick with rusticated brick quoins at the corners. The side windows are smaller versions of those at the ends; all have brick voussoirs, with projecting brick sills and keys. Limestone mullions and transomes producing Diocletian effect; obscured small-pane glazing.

The E side has a 2-bay central projection with paired, hipped roofs. These have actual Diocletian windows, one to each bay, each with 4 blind brick segmental niches above. Extruded in the angle between this projection and the main block on the S side is a low primary infill section with hipped roof and paired arched windows. A similar arrangement originally existed on the N side, though a more recent flush continuation of the projection has superseded this; this alteration has carefully copied the style of the primary work and has reused original dressings to match.

The (N) entrance front has a wide segmental arch below its large window, within which is a central entrance and flanking lights; boarded doors. The modern alteration to the E side is flush with this facade and has an arched window with oculus diagonally above.

The interior was not accessible at the time of survey.