Lochaber hydroelectric scheme

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The Lochaber hydroelectric scheme was a hydroelectric power generation project constructed in the Lochaber area of the western Scottish Highlands after the First World War. Like its predecessor at Kinlochleven, it was intended to provide electricity for aluminium production, this time at Fort William, a little further north. It is still in operation.


Penstocks carrying water to the aluminium smelter at Fort William; Ben Nevis is in the background

The scheme was initially designed by engineer Charles Meik but after his death in 1923, the scheme’s realisation was left to William Halcrow, by then a partner in the firm founded by Meik’s father Thomas Meik.

Laggan Dam

The project was finally sanctioned by Parliament in 1921, but construction did not start until 1924. On 30 December 1929, the first aluminium was cast.[1] It took about 95% of the 82,000 kW of power generated.

Loch Treig dam

The scheme harnessed the headwaters of the Rivers Treig and Spean and the floodwaters of the River Spey (plus a further eleven burns along the way). The Laggan Dam (213 m long and 55 m high) contained the flow of the Spean in a reservoir (Loch Laggan). A 4 km tunnel then linked this body of water with another reservoir (Loch Treig) contained by the Treig dam. From here, the main tunnel, until 1970 the longest water-carrying tunnel in the world, at 24 km (15 miles) long and 5 m in diameter, was driven around the Ben Nevis massif. From the western mountainside, down five massive steel penstocks, the water was channelled to the turbines in the power house at the smelting plant.

Present operation[edit]

Following the closure of Rio Tinto/Alcan's other UK smelters at Invergordon (1981), Kinlochleven (2000), Anglesey (2009) and Lynemouth (2012) the hydro-electric scheme and smelter at Fort William was operated by Rio Tinto Alcan. Under threat of closure the smelter was put up for sale in 2016. GFG Alliance, which incorporates SIMEC and the Liberty House Group, as the successful bidder, bought the Lochaber Smelter for £330m. It has plans to expand the factory and produce car parts.

See also[edit]


  1. ^ "Aluminium for Lochaber. Casting of first moulds. Future of the District". The Glasgow Herald. 31 December 1929. Retrieved 28 May 2017.

Coordinates: 56°49′44″N 5°04′23″W / 56.829°N 5.073°W / 56.829; -5.073