It is, I believe, one of those awful misnomers. You can see it
here, with the AWS in the mid-left foreground. The site is
two-thirds of the way up Loch Shin, on the southwestern side ...
not even in Glen Cassley.

http://www.geograph.org.uk/photo/951943

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There is more information on the Cassley hydro power station he
http://www.scottish-southern.co.uk/s...3B5A64BC98.pdf

Its water comes from the River Cassley, hence the name, although it is
sited on Loch Shin which inidectly feeds the Shin hydro power station.

HTH,

Cheers, Alastair.