Thieves have taken copper cable from overhead pylons in the Lochwinnoch and Kilbarchan areas over the last two weeks.
Officers are liaising with Scottish Power over the thefts, which have taken place in the dead of night, in a bid to catch the culprits.
Anyone with any information about the brazen robberies is asked to go to their local station, use the non-emergency 101 number, or contact Crimestoppers, anonymously, on 0800 555 111.
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