Turn power off in various cabins in Newry? (8)

I believe the answer is:

shutdown

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'various cabins in newry?' is the definition.
I can't tell whether this definition defines the answer.

'turn power off' is the wordplay.
'turn' becomes 'shut' (shutting is a kind of turning).
'power off' becomes 'down' (I can't explain this - if you can you should believe this answer much more).
'shut'+'down'='SHUTDOWN'

'in' is the link.

Can you help me to learn more?

(Other definitions for shutdown that I've seen before include "Closure" , "Cease business for the day - or permanently" .)

I've seen this clue in The Irish Times.

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