Transmission planning documents

Transmission planning documents

Tri-State’s most recent transmission plans within the 2016 filing, of the Rule 3627, utilize the 2014 load forecast data.  Base forecast data for these plans is available in Appendix A of Tri-State’s 2014 Electric Resource Plan Annual Progress Report (“ERP/APR”)

For more up to date information on Base Forecast, please click the link here:

Facility Connection Requirements V. 5.0

Tri-State's assessment of the transmission needs of its network customers over the 10-year planning horizon in its Load and Resource Transmission Analysis published in 2011.

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):

The GIP, including Generator Interconnection Agreement (GIA) can be found under Attachment K, updated January 1, 2016. Tri-State’s OATT includes a description of the transmission planning process as Attachment L, updated January 1, 2016.

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. Our economic studies were completed between February 2010 and 2012.

Tri-State is an active participant in regional transmission planning with other area utilities, including the Colorado Coordinated Planning Group and WestConnect.