Stornoway power station

[1] It was commissioned in 1954 to supply power to the Western Isles and currently comprises eight Mirrlees Blackstone, medium speed, diesel generators with a combined output of 25.5MW.

In 1990 a 33kV submarine interconnector cable was constructed to link to the 132kV single circuit from Fort Augustus via Skye to Harris onto Lewis.

Other smaller power stations on the Western Isles are located at; Arnish (nr Stornoway), Lewis; Loch Carnan, South Uist; and Ardveenish, Barra.

The power station has a total electrical rating of 25.5MW comprising eight Mirrlees Blackstone, medium speed, compression ignition engines with a net rated thermal input of between 5.1 MW and 12.0 MW, burning low sulphur (marine grade) diesel fuel oil, as detailed below;[4] NB: There is no engine number 4 or 7.

The engines are grouped to supply 3 exhaust stacks as follows; Nitrogen monoxide and nitrogen dioxide (NOx) mg/Nm3 emissions are limited to 1850 mg/Nm3 per stack The operating regime of the power station is heavily determined by the availability of the interconnector to the Scottish mainland and the local power demand in Stornoway.