TRP Methodology | Nov. 4 - 26, 2025
Skip to content EngagementHQ TRP & Supply SAS Permalink trp-and-supply-sas Important Dates & Materials November 26 | TRP Methodology feedback due (scroll down to submit) October 20 | TRP & Amendments for the AESO Connection Process Workshop Presentation posted October 27 | "Immediate Next Steps" slide updated Purpose To develop (with stakeholder input), administer and execute a Transmission Reinforcement Payment (TRP) that effectively functions with the transmission regulation to obtain a more efficient transmission system TRP & Supply SAS High-Level Engagement Schedule Click on image to expand Scope Methodology for calculating TRP rates – granularity of rate, soft cap, timing, qualitative/quantitative assessment, technology, proximity to transmission Changes to terms and conditions of the tariff – changes required to align with regulation, additional enhancements for efficiency and clarity, process to collect TRP, timing, and consequences Treatment of existing refunds held by AESO – status quo, accelerated refund process. Including transition period What Supply Transmission Service (STS) contract capacity means How Optimal Transmission Planning (OTP) and TRP impact System Access Service (SAS) The following topics are out of scope for this engagement: OTP Design REM Design Characters : 1203 Truncate description to the first 100 words Project Image image not present Project tags ADMIN | Manage Edit Survey DetailsManage QuestionsSettings Share TRP Methodology | Nov. 4 - 26, 2025
Purpose
Following stakeholder discussions during the October 22 & 23 TRP & Amendments for the AESO Connection Process workshops, we invite interested stakeholders to provide comments by November 26, 2025.
Instructions
- To submit your responses, you will need to be registered and signed in on the AESO Engage platform.
- Please click on the "Submit Feedback Here" box below to begin the survey and provide your specific comments.
- Please submit one completed survey per organization.
- All responses will be shared on AESO Engage.
- Responses are due by Nov. 26, 2025.
Feedback Questions
TRP Base Rate
The following questions are about TRP base rate options. Please provide rationale for your responses.
1. Certain base rate options like using the last approved NID or the near-term portfolio from OTP/LTP may lead to large variability in the base rate. Given the AESO’s preference to update the base rate prior to every Cluster, how important is it to have a stable or more consistent base rate between Clusters?
TRP Rate Formula Scalars
The AESO presented a TRP Rate formula that included individual scalars as percentages that would then be multiplied together. The following questions are related to the scalars used. Please provide rationale for your responses.
2. For the technical characteristics scalar, the AESO presented a demand for transmission capacity option based on the correlation between generation output by technology type and generation output of the planning area (based on flows onto the transmission system). How would you do this calculation differently, and why?
3. How important is it for the base rate to accurately reflect future transmission reinforcement costs as opposed to historical or average costs?
4. Is your preference to use individual scalars, a single weighted average scalar or something else entirely?
5. Is it appropriate for the scalars to go to 0%? If no, what would you suggest as a minimum level?
6. Should the AESO consider different or multiple TRP rates within a Cluster that reflects the changing available capacity in an area if multiple projects are proposing to connect at that same location? If yes, how should the AESO decide who gets the lower rate?
Rate STS
The following questions are about Rate STS. Please provide rationale for your responses.
7. What should STS contract capacity be based on—expected flow, maximum flow, or something else?
8. What should the consequences be for going over STS contract capacity, and what should that threshold be for going over (i.e., once in a year, 5% of time, over by a certain amount, etc.)?