GSI Utilities GSI Utilities Search | Advanced Search | New Members | Coupons and Discounts | All Categories Sort alphabetically by... Name City Avista _ PO Box 3727Spokane, WA 99220 (509) 495-8024 Member Since: 1895 An energy company involved in the production, transmission and distribution of energy. Learn More | Visit Site | View on Google Maps Inland Power _ PO Box ASpokane, WA 99219 (509) 747-7151 Member Since: 1985 Learn More | Visit Site | View on Google Maps TC Energy _ 201 West North River Drive Suite 505Spokane, WA 99201 425-465-3497 Member Since: 2021 Learn More | Visit Site Avista Utilities _ PO Box 3727Spokane, WA 99220 (509) 489-0500 Member Since: 1999 Learn More | Visit Site If your business isn't here, contact us today to get listed!