Tri-State’s most recent transmission plan, within the Rule 3627, use load forecast data. Base forecast data for these plans is available in Appendix A of Tri-State’s Electric Resource Plan Annual Progress Report (“ERP/APR”)
The most current information on Open Access Transmission Tariff (OATT) and Generator Interconnection Procedures (GIP) can be accessed on Tri-State's Open Access Same-time Information System (OASIS):
Tri-State’s Facility Rating Methodology and Reliability Criteria are documented in the Engineering Standards Bulletin - Criteria for System Planning and Service Standards.
Tri-State’s Transmission Plan, which is comprised of individual projects, provides for an effective utilization of the transmission system on a best-cost basis using the "single-entity concept," which takes into consideration the total costs of Tri-State, the Member, and other affected utilities.
Tri-State is an active participant in regional transmission planning with other area utilities, including the Colorado Coordinated Planning Group and WestConnect.