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May 3, 2022


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Flexible Ramping Product Refinements Impacts to WEIM Resource Sufficiency Evaluation, Call 5/10/22


The California ISO has scheduled a stakeholder call on May 10, 2022, to discuss the interactions between the nodal flexible ramping product (FRP) the ISO plans to implement in fall 2022 and the existing WEIM resource sufficiency evaluation (RSE). The purpose of this call is to review these interactions and to obtain stakeholder feedback regarding them.


The existing resource sufficiency evaluation includes a feature that limits Western Energy Imbalance Market (WEIM) energy transfers into and/or out of a balancing authority area (BAA) that fails either the RSE’s capacity or flexible ramping sufficiency test. The real-time market will limit energy transfers during the market interval the BAA failed to the transfer amount in the most recent market interval the BAA passed the RSE, or to its base-scheduled transfer amount, if greater. Importantly, the real-time market does not reduce these transfers completely to zero. The ISO has been working with stakeholders to refine the RSE as part of the Resource Sufficiency Evaluation Enhancements initiative.


The ISO also worked with stakeholders to develop a nodal FRP design as part of the Flexible Ramping Product Refinements initiative conducted from November 2019 to September 2020. The ISO is planning to file a tariff amendment with FERC that will support the implementation of nodal FRP in the ISO real-time market in fall 2022. The ISO posted the business requirements documents for stakeholder review on January, 28 2021 and March 11, 2022. As part of final review of the associated business requirement specifications and tariff, the ISO determined that certain detail regarding its planned nodal FRP design impact the existing RSE implementation and therefore intends to include hat detail in the tariff.


As a part of the planned nodal FRP design, the real-time market would limit WEIM energy transfers into and/or out of a BAA that fails the RSE to zero, or to its base-scheduled transfer amount, if greater.

The reason for this is that it would allow the real-time market to assign a BAA that fails the RSE an individual FRP procurement amount, which would be met without any diversity benefit or transfers with other BAAs.


Prior to filing the FRP tariff with FERC, the ISO is soliciting input from stakeholders on the proposed implementation. Failure of the existing RSE limits a BAA’s transfers but does not reduce them to zero. The ISO believes additional stakeholder discussion is appropriate before it proceeds with implementing the current nodal FRP design.


The presentation will be available prior to the call on the Flexible Ramping Product Refinements initiative webpage.


Please submit written comments on the meeting discussion by May 20, 2022, through the ISO’s commenting tool using the link on the initiative webpage.


The call will be recorded and the video file posted on the initiative webpage for a limited time. The recording is for informational and convenience purposes only, and any related transcriptions should not be reprinted without the ISO’s permission.


Meeting Details

Date: May 10, 2022

Time: 10 a.m. - 12 p.m. Pacific Time

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Web and audio participation information

Step 1: join web conference

Step 2: connect to audio by selecting “computer audio” or select “call me” and enter your phone number


Audio participation only: Call 1-888-251-2949 or 215-861-0694; access code: 7655962#


Technical support: call the AT&T Help Desk at 1-301-250-7202


Please contact Brenda Corona at or with any questions.
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