Powerhouse. Excluding Pipes To East And Tailrace To West, Kinlochleven Hydroelectric Scheme And Former Aluminium Smelter

The Powerhouse, designed by architect H. Scott Alban and supervising engineer W. M. Morrison between 1905 and 1909, is a long, single-storey building with a rectangular plan. It features granite rubble facings and a reinforced concrete frame. This structure is part of a large high-head hydro-electric scheme that once supplied electricity to an adjacent aluminium smelter, which was demolished in 2001.

The northeast elevation consists of 17 buttressed bays, each with tall tripartite windows. The northwest gable has a large opening with a metal roller door, two tripartite windows to the right, and a small narrow door, along with oculi in the pedimented gable. Alongside the northeast elevation, there are tail race and pipes equipped with control valves.

The roof is pitched and covered with Ballachulish slate, featuring glazed ridge vents on the northeast side and a long rooflight.

Inside, the Powerhouse has a plain interior with a Red Cheshire tiled floor and an off-centre track that was once used for a wagon rail. The splayed windows are complemented by painted and plastered interior brick walls. The space also includes a travelling crane supported by steel buttresses and steel lattice roof trusses.