Business Directory Go back to directory. Tongue River Electric Cooperative Tongue River Electric Cooperative Work 2435 U.S. Highway 212 PO Box 138 Ashland MT 59003 work Work Phone: Office: (406) 784-2341work Work Phone: Report Outages: 1-800-860-8235work Work Email: treco@tongueriverelectric.comINTERNET Website: http://www.tongueriverelectric.com/ BiographyTongue River Electric Coopertive, Inc (TRECO) was Incorporated January 22, 1946 . Currently TRECO serves 2,630 members with a history of over 4,966 members served.
