4000 N. Silverbell Rd. Tucson, AZ 85745 (520) 724-5900 HOURS: Weekdays: Noon - 7 p.m. Weekends: 10 a.m. - 5 p.m. Ajo Substation: 1259 Well Road Ajo, AZ 85321 (520) 387-7502 Ajo Substation Hours: 11 a.m.-1 p.m. MWF 4:30-6:30 p.m. W