Carrier profile · USDOT 180139 · Updated Jun 13, 2026
Tri-state Generation & Transmission Association Inc
295 power unitsavg 6.6 yrRegional · 4 statesWESTMINSTER, CO100/100
AUTHORITY STATUS UNKNOWNRATED SATISFACTORYHAZMAT
Identity & Federal
The official FMCSA identity — legal name, DBA, addresses, contact, officers, and registration — alongside the daily-captured federal-record activity feed, monitored daily by Vektor.
Location
- Physical address
- 1100 W 116TH AVE, WESTMINSTER, CO, 80234
- Mailing address
- PO BOX 33695, DENVER, CO, 80233
- Operation
- Interstate· Hazmat
Contact
- Phone
- (303) 254-3153
- Cell
- (303) 919-2854
- Fax
- (303) 254-6013
- tray@tristategt.org
- Web domain
- tristategt.org
Registration
- Officer
- Terri Marranzino-Ray
- USDOT / docket
- 180139
- First registered
- Jun 1, 1974
- Last MCS-150
- Aug 27, 2025 · 3,860,000 mi (2024)
- FMCSA safety rating
- Satisfactory · May 24, 1988
- D-U-N-S
- 42634378
Fleet (self-reported · MCS-150)
MCS-150 filing history· biennial-update cadence
Per-filing MCS-150 history (each biennial update + the fleet/mileage it reported) is being captured from the daily federal feed and will appear here as we capture the full history.
Federal record activity· monitored daily by Vektor
No licensing or insurance changes captured since Vektor began monitoring this carrier (June 2026). Quiet is usually good.