Pacific Power warned Thursday that scammers posing as utility representatives are calling customers and threatening to shut off electricity unless the customer makes a quick payment. Scammers say payments are overdue and advise customers to either pay immediately on the phone via a credit card, by calling a special number or by going to a store to buy a pre-paid card and call back with the code. Scammers have hit customers in Walla Walla and Astoria and may be targeting other communities, according to Pacific Power Vice President of Customer Service Karen Gilmore. “We urge our customers to be extremely …