A 4 MW on-site hydroelectric scheme with storage capacity has been commissioned in west Sutherland, on the Reay Forest Estate in Scotland.

Taking 20 months to construct, the Maldie project not only supplies energy to the grid, it has also involved the upgrading of an ‘off grid’ Reay Forest Estate hydro power scheme.

Using water from a Loch, a wier will raise the water level by 1.5 metres to form a storage reservoir. Water is fed into a 2 km-long buried pipeline connecting to a buried powerhouse located 170 metres below and which contains two 2 MW Francis turbines.

The plant can generate around 15,000 MWh of electricity a year and cost more than €17 million (US$23 million) to develop.