Gexa Energy Ohio Customer Service Business Hours: Monday - Friday, 8:00 a.m. to 7:00 p.m. (ET) E-mail: custserv@gexaenergy Gexa Energy Ohio Telephone (toll free): 888-223-9292 NOPEC Telephone (toll free): 800-292-9284 Correspondence Address: Gexa Energy Ohio 344 S. Poplar St. Hazleton, PA 18201-7155