The Utah Department of Commerce says the suspects call senior adults and tell them they can get a utility bill credit through an Obama administration grant.
Authorities say the scammers ask potential victims for their credit card, check routing and Social Security numbers to complete the arrangement.
Commerce officials say some victims are told their electricity will be cut off if they don't provide credit card information.
Rocky Mountain Power officials say customers can call the company if they're suspicious about similar calls. The utility says its true employees always wear identification, and will always have the customer's account number.
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