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(671) 648-3000 Guam Power Authority Customer Service Contact GPA Main Phone Number (671) 648-3000 Customer Service Call Center (671) 647-5787/8/9 Emergency / Trouble Call Reporting (671) 475-1472 /3 /4 Emergency / Trouble Call Reporting Fax (671) 475-5288 Report Fraud, Waste & Abuse Hotline (671) 648-3199