Police said the turbine on the Ardglass Road was targeted.
They said the turbine was deliberately set alight at around 3.30am on the morning of Thursday 16 October, completely destroying the structure from the inside.
News Catch Up - Friday 17th October
A PSNI spokesperson said: “Officers investigating this crime are working to establish a motive and are appealing for witnesses or those with any information that could assist their enquiries, to please get in touch by calling 101, quoting reference 936 17/10/25. "
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