Proposed Revision Request Detail Help
PRR Life Cycle*********Closed
PRR Details
PRR #
1153
Title Update the pre-calculation metered subsystem deviation penalty quantity configuration to properly calculate the metered subsystem expected instructed imbalance energy as per the metered subsystem agreement definition
Date Submitted 4/3/2019 4:44 PM
PRR Category B
Priority Emergency
Owner Kwong, Jennifer (CAISO)
Status Closed
Status End Date 6/18/2019 11:59 PM
Related BPM Settlements and Billing
BPM Section MSS Deviation Penalty Quantity Precalculation
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Existing Language
 

See BPM attached to this PRR

Proposed Language
 

See BPM attached to this PRR

Reason For Revision
 

 

In the past year, multiple disputes have been submitted by NCPA regarding the calculation of their MSS Expected IIE.  The SUPP quantity that is used as the business driver to derive this quantity is not representing the values that settlements is expecting and is not in line with the definition in the MSS Agreement.  Apart from this, other issues such as the Min Expost Capacity and Max Expost Capacity were not updated in real time when the MSS LF resource is de-rated, and an issue with the settlements formula that contained a MAX function that would not allow any decrement from the DA to be accounted as IIE. 

Due to all these issues, settlements has come up with a holistic solution to reconfigure the calculation for the MSS Expected IIE.  Instead of relying on ADS to calculate IIE, we use IIE inputs from MQS Expected Energy.  By doing so we eliminate the need to use all the inputs previously used that were presenting issues to the calculation.  We also are removing the MAX function to accommodate negative IIE.

 

BPM – MSS Deviation Penalty Quantity Precalculation 5.5

The planned production deployment date is 5/8/2019, and the effective dates are as follows:

5.5 – 1/1/2018 – Open

 
Click here to view the Recommendation Details for this PRR
BPM PRR Submitter

Kwong, Jennifer (CAISO)
Modified BPM language proposed by the PBM Chnage Management Coordinator

The ISO proposes no modified BPM language beyond that proposed in the BPM PRR.
Identification of the authorship of comments

Comments were submitted by Mike Whitney of NCPA on 4/18/19.
ISO response to comments on 4/22/19.
Action

Approve the BPM PRR as submitted

N/A
Statement of apparent requirements of the BPM PRR

This BPM PRR contains basic language changes.
Priority and rank for any BPM PRR requiring a CAISO system change

There are system changes associated with this PRR. The system changes are planned for implementation on 5/8/2019 on an emergency basis
Proposed effective date(s) of the BPM PRR

The ISO proposes an effective date of 1/1/2018 for the BPM revisions.
Other recommended actions

The ISO does not recommend any other actions on this BPM PRR.
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Final Decision

Final Decision: The ISO will adopt the BPM change as proposed in the recommendation.
Stakeholder Comment

No comments submitted.

Effective Date

1/1/2018
Action

Adopt the recommendation as originally issued

None
Announcements
No Announcements has been posted for this PRR.
Impact Analysis
IA - Impact Analysis Form for MSS LF Deviation Quantity PC.doc    
Notes:
Initial Comments
NCPA_Comments-PRR_1153.docx    
NCPA Comments are attached. Thank you.
4/18/2019 5:20 PM
Logged By - Mike Whitney (NCPA)
---------------------------------------------
ISO response:
Market Failures:
The CAISO is aware of this issue and is already working on a fix to be implemented with the Fall 2019 Release.

Forced Outage Accounting:
The CAISO’s new configuration that includes SLIC energy to account for forced outages is currently the most optimal solution when taken in consideration the limitations presented. We will continue look at future enhancements.

DOP vs DOT:
The CAISO is attempting to calculate Instructed Imbalance Energy as accurately as possible hence the use of Total Expected Energy which is a more comprehensive representation of the final dispatch. For instance, when there is an RTCD or Verbal Dispatch, DOT will not be accurately reflective of these scenarios unlike DOP. However, we appreciate the comment and will investigate this further.

Dispatch Window Concept:
The CAISO believes that the prior implementation of a dispatch window concept in settlements is redundant and could potentially have caused more issues, thus the removal from the configuration.  To ensure that MSS LF resources do not encroach into reserved capacity is and should be a market functionality.  Re-applying this filter in settlements is unnecessary when assuming the market dispatches MSS LF resources correctly.  Also, hypothetically if the market does dispatch the MSS LF resource below or above the reserved capacity for which the dispatch was followed, and the dispatch window filter is applied in the settlements configuration, there will be an inconsistency between the actual dispatch, and exemptions from the penalty.  Going forward, if there will be instances where and MSS resource encroaches into reserved capacity, we suggest to open a dispute and if valid, we will open a market defect.

Miscellaneous:
Thank you for this comment, we will take this in consideration.
4/22/2019 2:18 PM
Responded By - Kwong, Jennifer (CAISO)
Recommendation Comments
No Recommendation Comments available for this PRR.
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