Contact Us   Corporate Headquarters 100 South Ashley Dr. Suite 1400 TAMPA, FL 33602 PHONE: 813-301-4950 FAX: 813-301-4994 Gila Power Plant 1250 East Watermelon Rd. P.O. Box 798 Gila Bend, AZ 85337-0798 PHONE: 928-683-0110 FAX: 928-683-0140 Union Power Plant 6434 Calion Highway El Dorado, AR 71730-9462 PHONE: 870-748-2000 FAX: 870-748-2010 Trans-Union More Info: Trans-Union Interstate Pipeline L.P. PHONE: 813-301-4954 Emergency: 870-748-2051 Email Entegra@EntegraPower.com